JP6848396B2 - Light emitting diode drive device and lighting using it, fishing light - Google Patents

Description

The present invention relates to a light emitting diode driving device, lighting using the same, and a fishing light.

In recent years, as a light source for lighting, a light emitting diode (hereinafter, also referred to as "LED") that can be driven with lower power consumption than an incandescent lamp or a fluorescent lamp has attracted attention. LEDs have the advantages of being small, having strong impact resistance, and having a long life.

As a power source for such lighting equipment, it is desirable to use an AC power source such as a commercial power source. On the other hand, an LED is a DC drive element and emits light only with a forward current.

In order to meet these conflicting conditions, various LED drive circuits using an AC power supply have been proposed. For example, a method of switching LEDs so as to change the total value of Vf according to a changing voltage value has been proposed (Patent Document 1). In this method, as shown in the circuit diagram of FIG. 10, LEDs connected in series in multiple stages are divided into blocks 161 and 162, 163, 164, 165, and 166, and LED blocks are divided according to the voltage value of the input voltage of the rectified waveform. By switching the connections of 161 to 166 with the switch control unit 167 configured by the microcomputer, the total value of Vf is changed stepwise. As a result, as shown in the voltage waveform shown in the timing chart of FIG. 11, since the LED can be lit with a plurality of square waves with respect to the rectified waveform, the utilization efficiency of the LED is improved as compared with the ON duty with only a single square wave. Can be improved.

However, in this LED drive circuit, since the AC waveform is full-wave rectified by the diode bridge circuit, the lighting period of each LED configured in multiple stages is different as a result of the peak value of the voltage changing periodically. As a result, there is a problem that the lighting period of some LEDs is long and the lighting period of other LEDs is short, resulting in uneven light emission. Specifically, as shown in FIG. 11, while the lighting period of the first LED is the longest, the lighting period of the sixth LED is the shortest, and the operating rate is about 10% with respect to the first LED. .. As a result of uneven lighting time for each LED, for example, the LEDs are arranged in a relatively large area and are not suitable for applications requiring uniform irradiance, such as backlight lighting and signboard lighting.

On the other hand, in Patent Document 2, as shown in FIG. 12, switches for bypassing the current flowing through the light emitting blocks 171, 172, 173, and 174 are arranged in parallel with the switch block SB including the switches SB_1 to SB_3 arranged in series. An AC drive LED lighting device including a switch block SA including the switches SA_1 to SA_3 has been disclosed. In this AC drive LED lighting device, (1) in the odd-numbered rectification cycle, a continuous lighting method is implemented in which the light emitting block having a lower number is preferentially turned on (that is, from the light emitting block 171 on the left side with reference to the drawing). .. For this purpose, all the switch blocks SB arranged in series are shut off, and the switch blocks SA arranged in parallel are used to carry out lighting. (2) In the even-numbered rectification cycle, a continuous lighting method is performed in which the light emitting block having the highest number is preferentially turned on (that is, from the light emitting block 174 on the right side with reference to the drawing). For this purpose, all the switch blocks SA arranged in parallel are shut off, and the switch blocks SB arranged in series are used to carry out lighting.

According to this configuration, although it is possible to program the lighting period of an arbitrary light emitting block, the control for switching the switch becomes complicated, and an effective and complicated switch control logic 177 is required.

Japanese Unexamined Patent Publication No. 2006-147933 Japanese Patent Application Laid-Open No. 2014-503985

One of the objects of the present invention is to improve a light emitting diode driving device that uses an AC power source, lighting, and a fishing light using the light emitting diode driving device.

In order to achieve the above object, according to the light emitting diode drive device according to one aspect of the present invention, it is connected to an AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply. A first half-wave rectifying circuit for obtaining the first rectifying voltage, and a first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifying circuit. A second LED unit including at least one LED element connected in series with the first LED unit and a first rectification connected in parallel with the second LED unit and in series with the first LED unit. The first energization control unit for controlling the amount of energization to the first LED unit in a state where the voltage is applied and the first rectified voltage connected in series with the first LED unit and the second LED unit A second energization control unit for controlling the amount of energization to the first LED unit and the second LED unit in the applied state, and a first LED unit flowing in the state where the first rectifying voltage is applied. Based on the current value, the first current control unit for controlling the first energization control unit and the second energization control unit and the first current control unit are connected to a common AC power supply and have a pair of output sides, and the AC power supply has a pair of output sides. The second half-wave rectifying circuit for half-wave rectifying the AC voltage of the above at a timing different from that of the first half-wave rectifying circuit to obtain the second rectified voltage, and the second LED in parallel with the first LED section. One output of the sixth energization control unit and the second half-wave rectifier circuit, which are connected in series with the unit and for controlling the amount of energization to the second LED unit in a state where the second rectifying voltage is applied. The amount of energization to the first LED section and the second LED section is controlled in a state where the second rectifying voltage is applied, which is connected in series with the first LED section between the side and the first LED section. For controlling the fifth energization control unit and the sixth energization control unit based on the current value flowing through the second LED unit in a state where the second rectifying voltage is applied. A second current control unit can be provided.

According to the light emitting diode drive device according to another aspect of the present invention, it is connected to an AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply to obtain the first rectified voltage. First half-wave rectifier circuit, first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifier circuit, and connected in series with the first LED unit. A second LED unit including at least one LED element, a third LED unit including at least one LED element connected in series with the second LED unit, and the second LED unit in parallel with the second LED unit. In addition, the first energization control unit connected in series with the first LED unit to control the amount of energization to the first LED unit in a state where the first rectifying voltage is applied, the first LED unit, and the first LED unit. A second energization control unit connected in series with the second LED unit to control the amount of energization to the first LED unit and the second LED unit in a state where the first rectifying voltage is applied, and the first energization control unit. The amount of electricity supplied to the first LED unit, the second LED unit, and the third LED unit in a state where the first rectifying voltage is applied, which is connected in series with the first LED unit, the second LED unit, and the third LED unit. Based on the third energization control unit for control and the current value flowing through the first LED unit in a state where the first rectifying voltage is applied, the first energization control unit, the second energization control unit, and the third It has a first current control unit for controlling the energization control unit and a pair of output sides connected to a common AC power supply, and the AC voltage of the AC power supply is set at a timing different from that of the first half-wave rectifier circuit. The second half-wave rectifying circuit for half-wave rectifying to obtain the second rectified voltage is connected in series with the third LED section and in parallel with the second LED section when viewed from the third LED section. In addition, the seventh energization control unit for controlling the amount of energization to the third LED unit in a state where the second rectifying voltage is applied, and the second LED unit as viewed from the second LED unit, are connected in series. And a sixth energization control unit connected in parallel with the first LED unit to control the amount of energization to the second LED unit and the third LED unit in a state where the second rectifying voltage is applied. the second half-wave is connected in series with the first LED section between one of the output side to the first LED unit of the rectifier circuit, the first LED unit in a state in which the second rectified voltage is applied, Based on the fifth energization control unit for controlling the amount of energization to the second LED unit and the third LED unit, and the current value flowing through the third LED unit in a state where the second rectifying voltage is applied, the above. 5th energization control unit, 6th energization control unit, 7th energization control unit and 8th energization control A second current control unit for controlling the unit can be provided.

Further, according to the light emitting diode drive device according to another aspect of the present invention, the light emitting diode drive device is connected to the AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply to obtain the first rectified voltage. The first half-wave rectifier circuit for the purpose, the first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifier circuit, and the first LED unit in series. A second LED unit including at least one LED element connected, a third LED unit including at least one LED element connected in series with the second LED unit, and a third LED unit connected in series with the third LED unit. The fourth LED unit including at least one LED element connected to the second LED unit is connected in parallel with the second LED unit and in series with the first LED unit, and the first rectifying voltage is applied. The first energization control unit for controlling the amount of energization to the first LED unit is connected in series with the first LED unit and the second LED unit, and the first rectifying voltage is applied. The first rectified voltage connected in series with the second energization control unit for controlling the amount of energization to the LED unit and the second LED unit, and the first LED unit, the second LED unit, and the third LED unit. A third energization control unit for controlling the amount of energization to the first LED unit, the second LED unit, and the third LED unit, and the first LED unit, the second LED unit, and the third LED unit. Controls the amount of electricity supplied to the first LED section, the second LED section, the third LED section, and the fourth LED section while the first rectifying voltage is applied, which is connected in series with the LED section and the fourth LED section. The first energization control unit, the second energization control unit, and the third energization based on the current value flowing through the first LED unit with the fourth energization control unit and the first rectifying voltage applied. It has a pair of output sides connected to a common AC power supply and a first current control unit for controlling the control unit and the fourth energization control unit, and the AC voltage of the AC power supply is rectified by the first half wave. A second half-wave rectifying circuit for half-wave rectifying to obtain a second rectified voltage at a timing different from that of the circuit, and a second half-wave rectifying circuit connected in series with the fourth LED section and in parallel with the third LED section. The eighth energization control unit for controlling the amount of energization to the fourth LED unit while the rectifying voltage is applied is connected in series with the third LED unit and in parallel with the second LED unit. , The seventh energization control unit for controlling the amount of energization to the third LED unit and the fourth LED unit in a state where the second rectifying voltage is applied, and the first energization control unit in series with the second LED unit. The second rectified voltage connected in parallel with the LED section is applied. In this state, the sixth energization control unit for controlling the amount of energization to the second LED unit, the third LED unit, and the fourth LED unit, one output side of the second half-wave rectifier circuit, and the first To the first LED section, the second LED section, the third LED section, and the fourth LED section in a state where the second rectified voltage is applied, which is connected in series with the first LED section with the LED section. The fifth energization control unit for controlling the amount of energization and the fifth energization control unit and the sixth energization control unit based on the current value flowing through the fourth LED unit in a state where the second rectified voltage is applied. , A seventh energization control unit and a second current control unit for controlling the eighth energization control unit can be provided.

According to the above configuration, the circuit for lighting and driving the first LED unit and the second LED unit connected in series is operated by the circuit group operated by the first rectified voltage and the second rectified voltage. The lighting time of the first LED section and the second LED section is made uniform by preparing two of the circuit groups and differently controlling the lighting in each half-wave rectified section of the first rectified voltage and the second rectified voltage. It is possible to realize high-quality light emission with reduced light emission unevenness.

It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 1. FIG. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 2. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 3. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 4. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 5. It is a circuit diagram of the light emitting diode drive device which concerns on Example 1. FIG. It is a block diagram which shows the light emitting diode drive device which the present inventor developed earlier. FIG. 8A is a graph showing the relationship between the power supply voltage during lighting driving of the light emitting diode driving device of FIG. 7 and the lighting period of each LED, and FIG. 8B is the power supply voltage of the light emitting diode driving device according to the first embodiment and lighting of each LED. It is a graph which shows the relationship with a period. It is a circuit diagram of the light emitting diode drive device which concerns on Example 2. FIG. It is a circuit diagram which shows the example of the LED lighting circuit using a microcomputer. It is a timing chart which shows the operation of the LED lighting circuit of FIG. It is a block diagram which shows the AC drive LED lighting apparatus suitable for the reverse circulation lighting method.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the embodiments shown below are for embodying the technical idea of the present invention, and the present invention is not specified as the following. In addition, the present specification does not specify the members shown in the claims as the members of the embodiment. In particular, the configuration, dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention to that alone unless otherwise specified. It is just an example of explanation. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Further, in the following description, members of the same or the same quality are shown with the same name and reference numeral, and detailed description thereof will be omitted as appropriate. Further, each element constituting the present invention may be configured such that a plurality of elements are composed of the same member and the plurality of elements are combined with one member, or conversely, the function of one member is performed by the plurality of members. It can also be shared and realized. In addition, in this specification, "connected in series" may include a mode in which another member is interposed between them.

According to one embodiment, the addition to any of the, the first current control section, in a state where the first rectified voltage from one of the output side of the first half-wave rectifier circuit is applied, the first One LED unit is lit, then the second LED unit is lit while the first LED unit is lit, and the second LED unit is turned off while the first LED unit is lit. The second current control unit lights the second LED unit and then lights the second LED unit in a state where the second rectifying voltage is applied from one output side of the second half-wave rectifying circuit. The first LED unit can be turned on while the first LED unit is turned on, and the first LED unit can be turned off while the second LED unit is turned on. With the above configuration, the circuit group operated by the first rectified voltage and the circuit group operated by the second rectified voltage are connected to the first LED unit and the second LED unit connected in series, respectively, and are common. By reversing the order in which the first LED section and the second LED section are lit in the first half-wave section and the second half-wave section, which are half-wave rectified from the AC power supply, the first LED section and the first LED section are lit. The lighting time of the second LED unit can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized.

According to another embodiment, in addition to any of the above configurations, a first current detection for detecting the amount of current flowing through the first LED unit, which is further connected in series to the downstream side of the second LED unit. Can be equipped with a vessel.

Further, in addition to any of the above configurations, a second current detector connected in series to the upstream side of the first LED unit for detecting the amount of current flowing through the second LED unit can also be provided. ..

Furthermore, in addition to any of the above configurations, a smoothing capacitor connected in parallel to an LED assembly that is a series connection of LEDs including the first LED portion and the second LED portion can also be provided. ..

It can also be a fishing light driven by a light emitting diode driving device having any of the above configurations, or an illumination driven by a light emitting diode driving device.
<Embodiment 1>

FIG. 1 shows a block diagram of the light emitting diode driving device 100 according to the first embodiment of the present invention. The light emitting diode drive device 100 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, and a second LED unit connected to a single-phase AC power supply AP, respectively. 12, the first energization control unit 21, the second energization control unit 22, the fifth energization control unit 25, the sixth energization control unit 26, the first current control unit 31, and the second current control unit 32. , A first current detector 41 and a second current detector 42 are provided.

The first half-wave rectifier circuit 51 is a circuit that is connected to a single-phase AC power supply AP and half-wave rectifies the AC voltage of the AC power supply AP to obtain the first rectified voltage.

The second half-wave rectifier circuit 52 is a circuit that is connected to the same AC power supply AP and half-wave rectifies the AC voltage of the AC power supply AP to obtain a second rectified voltage. The timing at which the second half-wave rectifier circuit 52 half-wave rectifies the AC voltage is different from the timing at which the first half-wave rectifier circuit 51 performs half-wave rectification, that is, the first half-wave rectifier circuit 51 does not perform half-wave rectification. The timing. As a result, the first rectified voltage and the second rectified voltage have a positive phase and an opposite phase relationship. Here, the first rectified voltage half-wave rectified by the first half-wave rectifier circuit 51 and the second rectified voltage half-wave rectified by the second half-wave rectifier circuit 52 are 180 ° out of phase.

The first LED unit 11 and the second LED unit 12 each include at least one LED element, and one or more LED elements are connected in series. The first LED unit 11 and the second LED unit 12 are connected in series to form an LED assembly 10. The addition tuna want the line from the first LED unit 11 to the second LED unit 12 to the output line OL.

The output line OL is connected to the output side of the first half-wave rectifier circuit 51 and the output side of the second half-wave rectifier circuit 52, respectively. When viewed from the output line OL side, the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 are in parallel. However, in the example of FIG. 1, a fifth energization control unit 25 and a second current detector 42 are interposed between the output side of the second half-wave rectifier circuit 52 and the first LED unit 11.
(First circuit group 1)

Further, the LED assembly 10 including the first LED unit 11 and the second LED unit 12 connected to the output line OL is operated by the first rectified voltage half-wave rectified by the first half-wave rectifier circuit 51. One circuit group 1 is connected. Specifically, the first circuit group 1 includes a first energization control unit 21, a second energization control unit 22, a first current control unit 31 for controlling these, and a first current detector 41.

The first energization control unit 21 is connected in series with the first LED unit 11 and in parallel with the second LED unit 12 when viewed from the first LED unit 11. The first energization control unit 21 is a member for controlling the amount of energization to the first LED unit 11 in a state where the first rectified voltage is applied, and functions as a first bypass unit.

Further, the second energization control unit 22 is connected in series with the second LED unit 12 when viewed from the second LED unit 12. The second energization control unit 22 is a member for controlling the amount of energization to the first LED unit 11 and the second LED unit 12 in a state where the first rectified voltage is applied, and is the second bypass unit or the second bypass unit 22. 1 Functions as a current limiter.

Further, the first current control unit 31 is a member for controlling the first energization control unit 21 and the second energization control unit 22 based on the current value flowing through the output line OL in a state where the first rectified voltage is applied. Is. In the example of FIG. 1, a first current detector 41 is provided on the output line OL in order to detect the current flowing through the output line OL. Here, the first current detector 41 is arranged between the second energization control unit 22 and the grounding end. In other words, the first current detector 41 is connected in series to the downstream side of the second LED unit 12 via the second energization control unit 22. In this configuration, when the first rectified voltage is applied, the second circuit group 2 described later is in the OFF state, so that the current flowing through the output line OL is equal to the current flowing through the first LED unit 11.
(Second circuit group 2)

Further, in the LED assembly 10 connected to the output line OL, a second circuit group operated by a second rectified voltage half-wave rectified by the second half-wave rectifier circuit 52, separately from after the first circuit group 1. 2 is connected. Specifically, the second circuit group 2 includes a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 for controlling these, and a second current detector 42.

The sixth energization control unit 26 is connected in series with the second LED unit 12 and in parallel with the first LED unit 11 when viewed from the second LED unit 12. The sixth energization control unit 26 is a member for controlling the amount of energization to the second LED unit 12 in a state where the second rectified voltage is applied, and functions as the sixth bypass unit.

Further, the fifth energization control unit 25 is connected in series with the first LED unit 11 when viewed from the first LED unit 11. In other words, the output side of the second half-wave rectifier circuit 52 and the first LED unit 11 are connected in series. The fifth energization control unit 25 is a member for controlling the amount of energization to the second LED unit 12 and the first LED unit 11 in a state where the second rectified voltage is applied, and is the fifth bypass unit or the fifth. (2) Functions as a current limiting unit.

Further, the second current control unit 32 is a member for controlling the sixth energization control unit 26 and the fifth energization control unit 25 based on the current value flowing through the output line OL in a state where the second rectified voltage is applied. Is. In the example of FIG. 1, a second current detector 42 is provided on the output line OL in order to detect the current flowing through the output line OL. Here, the second current detector 42 is arranged between the fifth energization control unit 25 and the output side of the second half-wave rectifier circuit 52. In other words, the second current detector 42 is connected in series to the upstream side of the first LED unit 11 via the fifth energization control unit 25. In this configuration, since the first circuit group 1 is in the OFF state when the second rectified voltage is applied, the current flowing through the output line OL is equal to the current flowing through the second LED unit 12.

The light emitting diode driving device 100 described above is operated at the first rectified voltage as a circuit for lighting and driving the first LED unit 11 and the second LED unit 12 connected in series. Two are prepared, a first circuit group 1 and a second circuit group 2 operated by a second rectified voltage. In the example of FIG. 1, both the first circuit group 1 and the second circuit group 2 include the LED assembly 10, and the first circuit group 1 is formed on the left side of the LED assembly 10. Members such as the energization control unit 21 are arranged, and the sixth energization control unit 26 and the like constituting the second circuit group 2 are arranged on the right side. Then, the LED assembly 10 is configured by differently controlling the lighting in each half-wave rectified section of the first rectified voltage that drives the first circuit group 1 and the second rectified voltage that drives the second circuit group 2. The lighting time of the first LED unit 11 and the second LED unit 12 can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized. Specifically, the first half-wave rectifier circuit 51 connected to the single-phase AC power supply AP obtains the first rectified voltage obtained by rectifying the AC voltage. When this rectified voltage rises to a voltage at which the first LED unit 11 can be lit, the first current control unit 31 lights the first LED unit 11 with an appropriate preset drive current, and then the first rectified voltage is further increased. When the voltage between the terminals of the first energization control unit exceeds Vf of the second LED unit (the first energization control unit is cut off) when the voltage rises to the voltage at which both the first LED unit and the second LED unit can be lit, this first energization control unit When the second LED unit 12 is lit with an appropriate drive current while the one LED unit 11 is lit, the first rectified voltage exceeds the peak and falls below the voltage at which both the first and second LED units can be lit. The second LED unit 12 is turned off while the first LED unit 11 is lit, and when the first rectifying voltage drops below the voltage that can be lit, the first LED unit 11 is turned off.

Next, the second half-wave rectifier circuit 52 obtains a second rectified voltage obtained by rectifying a waveform having a phase opposite to that of the first half-wave rectifier circuit 51 among the AC voltages. When the rectified voltage rises to a voltage at which the second LED unit 12 can be turned on, the second current control unit 32 turns on the second LED unit 12 with an appropriate drive current set in advance. Next, when the second rectified voltage further rises to a voltage at which both the first LED section and the second LED section can be lit, the voltage between the terminals of the sixth energization control section exceeds Vf of the first LED section (the sixth energization control section is (Interrupted), the first LED section 11 is lit with an appropriate drive current while the second LED section 12 is lit, the second rectified voltage exceeds the peak, and both the first and second LED sections can be lit. When the value is lower than the above, the first LED unit 11 is turned off while the second LED unit 12 is still lit, and when the second rectifying voltage is lower than the voltage that can be lit, the second LED unit 12 is turned off. In this way, in the first half-wave rectification section and the second half-wave rectification section that are half-wave rectified from the common AC power supply AP, the order in which the first LED section 11 and the second LED section 12 are turned on is reversed. By doing so, the lighting times of the first LED unit 11 and the second LED unit 12 can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized.
(First energization control unit 21)

Hereinafter, each member will be described in detail. The first energization control unit 21 for controlling the amount of energization to the first LED unit 11 is connected in parallel with the second LED unit 12. One end of the first energization control unit 21 is connected in series with the downstream side of the first LED unit 11, and the other end is connected to the upstream side of the first current detector 41 to energize the first LED unit 11. Configure a bypass route to adjust the amount. That is, since the amount of current bypassed by the first energization control unit 21 can be adjusted, the energization amount of the first LED unit 11 can be controlled as a result. In the example of FIG. 1, the first energization control unit 21 is connected in parallel with the second LED unit 12 to form the first bypass path BP1. Note that the parallel connection here does not require that both ends of each LED unit and each energization control unit are connected, and one end of each energization control unit is connected to one end of each LED unit, and the current is generated. It suffices if it is configured to be branched. For example, in the example of FIG. 1, one end of the first energization control unit 21 is connected to the upstream side of the second LED unit 12, and the other end is connected to the upstream side of the first current detector 41 on the output line OL. ing. As described above, the parallel connection of each energization control unit is used to mean a connection form in which the current of each LED unit connected on the output line OL is branched.

The first energization control unit 21 can be composed of, for example, a bypass unit that bypasses the current flowing through the first LED unit 11 and a current control unit that controls the operation of the bypass unit. Here, the energization control unit is a member for controlling a current circuit that drives the current of the LED unit. For example, a kind of constant current circuit is configured by the first energization control unit 21 and the first current control unit 31 that controls the operation of the first energization control unit 21, that is, the operation such as ON / OFF and continuously variable current amount. Will be done. In the control of this constant current circuit, for example, the first current detector 41 connected to the output line OL is used to monitor the current amount of the LED assembly 10, and the first current control unit 31 is the bypass unit based on this value. Switch the control amount of. In addition to the bypass unit and the current control unit, the first energization control unit may be integrally configured as the first energization control unit. Such a first energization control unit can be configured by a semiconductor drive element such as a transistor.

Similarly, the sixth energization control unit 26 for controlling the amount of energization to the sixth LED unit 16 constituting the second circuit group 2 is connected in parallel with the first LED unit 11. The sixth energization control unit 26 has one end connected in series with the upstream side of the second LED unit 12 and the other end connected to the downstream side of the second current detector 42, and is bypassed by the sixth energization control unit 26. By adjusting the amount of current to be applied, a bypass path for adjusting the amount of energization to the second LED unit 12 is configured. In the example of FIG. 1, the sixth energization control unit 26 is connected in parallel with the first LED unit 11 to form the sixth bypass path BP8. Further, the sixth energization control unit 26 and the second current control unit 32 that controls the operation of the sixth energization control unit 26 form a kind of constant current circuit. To control this constant current circuit, for example, a second current detector 42 connected to the output line OL is used to monitor the amount of current of the LED assembly 10, and the second current control unit 32 is a bypass unit based on this value. Switch the control amount of. Specifically, the first LED unit and the sixth energization control unit arranged in parallel with the first LED unit, or the second LED and the first energization control unit arranged in parallel with the second LED unit are the second half-wave rectifier circuit and the first half-wave, respectively. The same operation is performed when the rectifier circuit operates. In constant current operation (or controlled to a sine wave), the energization control unit consumes the difference voltage between the Vf of the LED connected to the energization control unit and the power supply voltage (voltage between terminals of the energization control unit). When the voltage rises and this consumption voltage exceeds the Vf of the parallel LEDs, a current automatically flows to the LED side, and control is transferred to another energization control unit arranged in series with this LED. Therefore, the switching timing is always appropriate, and the power efficiency is maintained at the best.
(LED assembly 10)

On the other hand, each LED unit constituting the LED assembly 10 is a block in which one or a plurality of LED elements are connected in series and / or in parallel. As the LED element, a surface mount type (SMD) or a bullet type LED can be appropriately used. Further, the outer shape of the SMD type LED element package can be selected according to the application, and a type having a rectangular plan view can be used. Further, it goes without saying that it is also possible to use an LED in which a plurality of LED elements are connected in series and / or in parallel in a common package as an LED unit.

_{The first forward voltage Vf 1} , which is the added value of the forward voltage of the LED elements included in the first LED unit 11, is determined by the number of LED elements connected in series. _{Further, the second forward voltage Vf 2} for lighting both the first LED section 11 and the second LED section 12 is further connected in series to the first forward voltage Vf ₁ included in the second LED section 12. It is the value obtained by adding the forward voltage of the LED element.
(First current detector 41)

In the first half-wave rectification section to which the first rectifying voltage is applied, the light emitting diode driving device 100 is based on the current value detected by the first current detector 41, and the second rectifying voltage is applied to the second rectifying voltage. In the half-wave rectification section, the amount of energization for each LED unit is controlled based on the current value detected by the second current detector 42. In other words, since the current control is based on the amount of current actually applied, not the voltage value of the rectified voltage, it is not affected by the variation in the forward voltage of the LED element, and the LED section is switched accurately at the appropriate timing. Is realized, and stable operation with high reliability is expected. A first current detector 41 and a second current detector 42 are used to detect this current value. A resistor or the like can be preferably used as the first current detector 41 or the like. In the example of FIG. 1, the first current detector 41 is connected to the downstream side of the second energization control unit 22, but the first current detector is not limited to this position and is located at another position on the output line. It may be provided. For example, the second current detector and the first current detector, which will be described later, may be shared.
<Embodiment 2>

In the example of FIG. 1, two LED units are used, and the first LED unit 11 and the second LED unit 12 are connected in series to form the LED assembly 10. However, the present invention does not limit the number of LED units to two, and for example, the number of LED units may be three or more. As an example, FIG. 2 shows an example in which the LED aggregate is composed of the first LED unit 11, the second LED unit 12, and the third LED unit 13. The light emitting diode drive device 200 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, a second LED unit 12, a third LED unit 13, and a third LED unit. One energization control unit 21, a second energization control unit 22, a third energization control unit 23, a fifth energization control unit 25, a sixth energization control unit 26, a seventh energization control unit 27, and a first current. It includes a detector 41 and a second current detector 42. The same members as those in FIG. 1 are given the same names, and detailed description thereof will be omitted.

The third LED unit 13 includes at least one LED element like the first LED unit 11 and the second LED unit 12. Further, the third LED unit 13 is connected in series with the first LED unit 11 and the second LED unit 12, and constitutes the LED assembly 10. Further from the first LED unit 11 and the second LED unit 12, tuna want the line is the output line OL to the third LED unit 13.

The first circuit group 1 includes a third energization control unit 23 in addition to the first current detector 41, the first energization control unit 21, and the second energization control unit 22. Further, the first current control unit 31 controls the first energization control unit 21, the second energization control unit 22, and the third energization control unit 23. The second energization control unit 22 forms the second bypass path BP2, and controls the amount of energization to the first LED unit 11 and the second LED unit 12 in a state where the first rectified voltage is applied.

The third energization control unit 23 is connected in series with the third LED unit 13 when viewed from the third LED unit 13. The third energization control unit 23 is a member for controlling the amount of energization to the first LED unit 11, the second LED unit 12, and the third LED unit 13 in a state where the first rectified voltage is applied. (3) Functions as a bypass section or a first current limiting section. Further, the first current control unit 31 is based on the current value flowing through the output line OL in a state where the first rectified voltage is applied, that is, the current value flowing through the first LED unit 11 here, and the first energization control unit 21. , The second energization control unit 22 and the third energization control unit 23 are controlled. The current flowing through the first LED unit 11 is detected by the first current detector 41.

The second circuit group 2 includes a seventh energization control unit 27, a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 for controlling these, and a second current detector 42. Further, the second current control unit 32 controls the seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25.

The seventh energization control unit 27 is connected in series with the third LED unit 13 when viewed from the third LED unit 13. Further, the seventh energization control unit 27 is connected in parallel with the second LED unit 12. The seventh energization control unit 27 is a member for controlling the amount of energization to the third LED unit 13 in a state where the second rectified voltage is applied, and functions as the seventh bypass unit. Further, the second current control unit 32 is based on the current value flowing through the output line OL in a state where the second rectified voltage is applied, that is, the current value flowing through the third LED unit 13 here, and the seventh energization control unit 27. , The sixth energization control unit 26 and the fifth energization control unit 25 are controlled. Further, the second current control unit 32 is set to the current value flowing through the output line OL, that is, the current value flowing through the third LED unit 13 and the second current control unit 32 in a state where the second rectified voltage is applied. Based on the comparison of the reference current values, the second current detector 42 detects the current flowing through the third LED unit 13.

Thus, with respect to the first LED unit 11 to the third LED unit 13 connected in series, a circuit for driving and lighting them, the first half-wave rectifier circuit 51 side and the tuna wants first circuit group 1, second half-wave rectifier circuit 52 side and the tuna wants to prepare two of the second circuit group 2, by varying the control of lighting in each half-wave rectification section of the first rectified voltage and the second rectified voltage, The lighting time of the first LED unit 11 to the third LED unit 13 can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized.

Although this embodiment is a subordinate concept of the first embodiment, it has been described as another embodiment in order to facilitate understanding of the invention.
<Embodiment 3>

Further, as the third embodiment, the light emitting diode driving device 300 configured by connecting four of the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 in series as an LED assembly. Is shown in FIG. The light emitting diode drive device 300 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, a second LED unit 12, a third LED unit 13, and a fourth LED unit. 14, the first energization control unit 21, the second energization control unit 22, the third energization control unit 23, the fourth energization control unit 24, the fifth energization control unit 25, the sixth energization control unit 26, and the seventh energization control. A unit 27, an eighth energization control unit 28, a first current detector 41, and a second current detector 42 are provided. The same members as those in FIGS. 1 and 2 are given the same names, and detailed description thereof will be omitted.

The fourth LED unit 14 includes at least one LED element like the first LED unit 11 to the third LED unit 13. Further, the fourth LED unit 14 is connected in series with the first LED unit 11 to the third LED unit 13 to form the LED assembly 10. Tuna want line is the output line OL to the fourth LED 14 from the first LED unit 11.

The first circuit group 1 includes a fourth energization control unit 24 in addition to the first current detector 41, the first energization control unit 21, the second energization control unit 22, and the third energization control unit 23. Further, the first current control unit 31 controls the first energization control unit 21, the second energization control unit 22, the third energization control unit 23, and the fourth energization control unit 24. The third energization control unit 23 forms the third bypass path BP3, and controls the amount of energization to the first LED unit 11, the second LED unit 12, and the third LED unit 13 in a state where the first rectified voltage is applied. To do.

The fourth energization control unit 24 is connected in series with the fourth LED unit 14 when viewed from the fourth LED unit 14. The fourth energization control unit 24 controls the amount of energization to the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 while the first rectifying voltage is applied. It is a member of the above and functions as a fourth bypass section or a first current limiting section. Further, the first current control unit 31 is based on the current value flowing through the output line OL in a state where the first rectified voltage is applied, that is, the current value flowing through the first LED unit 11 here, and the first energization control unit 21. , The second energization control unit 22, the third energization control unit 23, and the fourth energization control unit 24 are controlled. The current flowing through the first LED unit 11 is detected by the first current detector 41.

The second circuit group 2 includes an eighth energization control unit 28, a seventh energization control unit 27, a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 that controls them, and a second. A current detector 42 is provided. Further, the second current control unit 32 controls the eighth energization control unit 28, the seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25.

The eighth energization control unit 28 is connected in series with the fourth LED unit 14 when viewed from the fourth LED unit 14. Further, the eighth energization control unit 28 is connected in parallel with the third LED unit 13. The eighth energization control unit 28 is a member for controlling the amount of energization to the fourth LED unit 14 in a state where the second rectified voltage is applied, and functions as the eighth bypass unit. Further, the second current control unit 32 is based on the current value flowing through the output line OL in a state where the second rectified voltage is applied, that is, the current value flowing through the fourth LED unit 14 here, and the eighth energization control unit 28. , The seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25 are controlled. Further, the second current control unit 32 is set to the current value flowing through the output line OL, that is, the current value flowing through the fourth LED unit 14 and the second current control unit 32 in a state where the second rectified voltage is applied. Based on the comparison of the reference current values, the second current detector 42 detects the current flowing through the fourth LED unit 14.

Thus, with respect to the first LED unit 11 to the fourth LED 14 connected in series, a circuit for driving and lighting them, the first half-wave rectifier circuit 51 side and the tuna wants first circuit group 1, second half-wave rectifier circuit 52 side and the tuna wants to prepare two of the second circuit group 2, by varying the control of lighting in each half-wave rectification section of the first rectified voltage and the second rectified voltage, The lighting time of the first LED unit 11 to the fourth LED unit 14 can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized. That is, the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 each half-wave rectify the AC power supply AP, and supply power to the LED assembly 10 by half-cycle alternation of the AC power supply AP. As a result, the second half-wave rectifier circuit 52 does not rectify during the half cycle during which one first half-wave rectifier circuit 51 is operating, and the first half-wave rectifier circuit 51 pauses during the next half cycle. The two-half-wave rectifier circuit 52 operates. Therefore, during the operation of the first half-wave rectifier circuit 51, the first rectified voltage is supplied by this, the first circuit group 1 provided on the left side of the LED aggregate 10 operates, and the LED aggregate 10 is powered. Supply and drive. Then, in the next half cycle, the second half-wave rectifier circuit 52 supplies the second rectified voltage to the second circuit group 2 provided on the right side of the LED assembly 10 to operate, and the lighting order is opposite to that of the first half cycle. Then, power is supplied to the LED assembly 10. By operating in this way, the power supplied to the fourth LED unit 14, which has conventionally had the smallest total power supply, and the first LED unit 11, which has the largest total power supply, are substantially equal to each other. Similarly, the total power supplied to the second LED unit 12 and the third LED unit 13 becomes equal. As a result, the luminous intensity of each LED portion can be made uniform.

Although the present embodiment is a subconcept of the first and second embodiments, it has been described as another embodiment in order to facilitate understanding of the invention.
<Embodiment 4>

The light emitting diode drive device can also be provided with a harmonic suppression signal generation unit and a current control signal addition unit. As an example, FIG. 4 shows an example in which a harmonic suppression signal generation unit and a current control signal addition unit are added to the light emitting diode drive device of FIG. 3, as the fourth embodiment. In this light emitting diode drive device 400, the first harmonic suppression signal generation unit 61 and the first current control signal addition unit 71 are on the first circuit group 1 side, and the second harmonic suppression signal generation unit 71 is on the second circuit group 2 side. 62 and a second current control signal imparting unit 72 are provided, respectively. The first harmonic suppression signal generation unit 61 is connected to the output side of the first half-wave rectifier circuit 51, and is a member for generating a sine wave of a predetermined size and supplying it to the first current control unit 31. .. The second harmonic suppression signal generation unit 62 is a member connected to the output side of the second half-wave rectifier circuit 52 to generate a sine wave of a predetermined size and supply it to the second current control unit 32. is there.
(First harmonic suppression signal generation unit 61)

The first harmonic suppression signal generation unit 61 is connected to the first current control unit 31. The first harmonic suppression signal generation unit 61 generates the first harmonic suppression signal voltage based on the first rectification voltage output from the first half-wave rectifier circuit 51. Here, in a state where the first rectified voltage is applied, the first harmonic suppression signal generation unit 61 compresses the first rectified voltage rectified by the first half-wave rectifying circuit 51 to an appropriate size, and the first It is sent to one current control unit 31. The first current control unit 31 uses the signal sent from the first harmonic suppression signal generation unit 61 as a reference signal and compares it with the first current detection signal detected by the first current detector 41. Based on this comparison result, the first current control unit 31 drives each LED unit at an appropriate timing and current via the first energization control unit 21 to the fourth energization control unit 24.

Similarly, the second harmonic suppression signal generation unit 62 is connected to the second current control unit 32. The second harmonic suppression signal generation unit 62 generates a second harmonic suppression signal voltage based on the second rectifier voltage output from the second half wave rectifier circuit 52. Here, in a state where the second rectified voltage is applied, the second harmonic suppression signal generation unit 62 compresses the second rectified voltage rectified by the second half-wave rectifying circuit 52 to an appropriate size, and the second rectified voltage is applied. (2) It is sent to the current control unit 32. The second current control unit 32 uses the signal sent from the second harmonic suppression signal generation unit 62 as a reference signal and compares it with the second current detection signal detected by the second current detector 42. Based on this comparison result, the second current control unit 32 drives each LED unit at an appropriate timing and current via the fifth energization control unit 25 to the eighth energization control unit 28.
(First current control signal addition unit 71)

Further, a first current control signal imparting unit 71 is interposed between the first current control unit 31 and the first energization control units 21 to the fourth energization control unit 24. For example, since a potential difference occurs between the operation control signal applied to the first energization control unit 21 and the operation control signal applied to the fourth energization control unit 24, the first energization control is performed by providing the first current control signal application unit 71. It is possible to reliably switch the operation of the unit 21 and the fourth energization control unit 24. Similarly, a second current control signal imparting unit 72 is interposed between the second current control unit 32 and the fifth energization control unit 25 to the eighth energization control unit 28.
<Embodiment 5>

The light emitting diode drive device can also be additionally equipped with a smoothing circuit. As an example, an example in which a smoothing circuit is added to the light emitting diode driving device of FIG. 3 is shown in FIG. 5 as a fifth embodiment. The light emitting diode driving device 500 shown in this figure includes a smoothing circuit connected in parallel with the LED assembly 10. The smoothing circuit is a member for reducing the extinguishing period of the LED assembly 10. This smoothing circuit is composed of, for example, a smoothing capacitor 80.
(Charging the smoothing capacitor 80)

The voltage between the terminals of the smoothing capacitor 80 is equal to _{the sum Vf all} of the forward voltages of all the LEDs of the first LED unit 11 to the fourth LED unit 14 in the steady operation state. Therefore, when the input voltage reaches the voltage at which the first LED units 11 to the fourth LED units 14 are driven, charging is started, and the input voltage is applied to the first LED units 11 to the fourth LED units 14 from the current control unit 30. Charging ends when the voltage drops to a voltage that cannot be driven by the instructed current value (shifts to a state in which the first LED unit 11 to the third LED unit 13 are driven). During the charging period, when the capacitor terminal voltage rises due to charging, Vf _all also rises, so that the LED drive current increases and the charging current to the smoothing capacitor 80 gradually decreases. The capacitor charging current and the LED drive current are combined and controlled by the current control unit 30 to be a sinusoidal current. As a result, the smoothing capacitor 80 can be charged without affecting the current of the entire light emitting diode driving device, which is originally controlled by a current waveform similar to a sine wave.
(Discharge from smoothing capacitor 80)

On the other hand, the smoothing capacitor 80 discharges the electric charge accumulated therein to the connected first LED units 11 to 4th LED units 14. _{Since the charging voltage of the smoothing capacitor 80 is the sum of the forward voltages Vf 1-4 of} the first LED units 11 to 4th LED units 14 connected in series forming the LED assembly 10, the LED assembly is performed when the capacitor is charged. The smoothing capacitor 80 is not discharged by a current equal to or greater than the current flowing through the body 10.

Needless to say, the elements added in each of the above-described embodiments can be similarly applied to other embodiments, for example, embodiments 1 and 2.
<Example 1>

Next, a specific circuit configuration example in which the light emitting diode driving device 400 of FIG. 4 is realized by using a semiconductor element is shown in FIG. 6 as Example 1. The light emitting diode drive device 600 uses a diode as the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 connected to the AC power supply AP. In the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52, the rectification directions of the diodes are opposite to each other.

A protective member 81 is connected in series to the AC power supply AP. As the protective member, a fuse for preventing overcurrent can be preferably used. Further, the AC power supply AP may be provided with a surge protection circuit. Further, a bypass capacitor 82 is connected in parallel with the AC power supply AP.
(AC power supply AP)

As the AC power supply AP, a commercial power supply of 100V or 200V can be preferably used. 100V or 200V of this commercial power supply is an effective value, and the maximum voltage of the full-wave rectified rectified waveform is about 141V or 282V.
(LED assembly 10)

Each LED unit constituting the LED assembly 10 is connected in series with each other, divided into a plurality of blocks, and terminals are pulled out from the boundary between the blocks to form a first energization control unit 21 and a second energization control unit 22. , The third energization control unit 23 and the fourth energization control unit 24 are connected. In the example of FIG. 6, the LED assembly 10 is composed of four groups of the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14.

In each of the LED units 11 to 14 shown in FIG. 6, one LED symbol represents an LED package on which a plurality of LED chips are mounted. In this example, each LED package mounts 10 LED chips. The number of light emitting diode connections in each LED unit or the number of LED unit connections is determined by the added value of the forward voltage, that is, the total number of LED elements connected in series and the power supply voltage to be used. For example, when a commercial power source is used, the total forward voltage Vf _all , which is the total Vf of each LED unit, is set to be about 141V or less.

Further, in the example of FIG. 6, the Vf of the four LED units is designed to be the same. However, the present invention is not limited to this example, and the number of LED copies may be 3 or less or 5 or more as described above. By increasing the number of LED units, the number of current controls can be increased to enable finer lighting switching control between the LED units. Further, the Vf of each LED unit does not have to be the same.
(1st energization control unit 21 to 4th energization control unit 24)

The first energization control unit 21, the second energization control unit 22, the third energization control unit 23, and the fourth energization control unit 24 are members for driving a current corresponding to each LED unit. Such first energization control units 21 to fourth energization control units 24 are composed of semiconductor elements such as transistors. In particular, FET is preferable in terms of efficiency because the gate is voltage-driven. However, it goes without saying that the first energization control unit 21 to the fourth energization control unit 24 are not limited to FETs, and can also be configured by a bipolar transistor or the like.

In the example of FIG. 6, an LED current control transistor is used as the first energization control unit 21 to the fourth energization control unit 24. Specifically, the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 have first energization control units 21 to fourth energization control units 24 on the downstream side, respectively. The first energization control transistor 21B, the second energization control transistor 22B, the third energization control transistor 23B, and the fourth energization control transistor 24B are connected. Each energization control transistor switches its ON state and current control according to the amount of current in the LED section in the previous stage. When the energization control transistor is turned off, no current flows in the bypass path, and the LED portion is energized. That is, since the amount of current bypassed by each of the first energization control units 21 to the fourth energization control unit 24 can be adjusted, the energization amount of each LED unit can be controlled as a result. In the example of FIG. 6, the first energization control unit 21 is connected in parallel with the second LED unit 12 to form the first bypass path BP1. Further, the second energization control unit 22 is connected in parallel with the third LED unit 13 to form the second bypass path BP2. Further, the third energization control unit 23 is connected in parallel with the fourth LED unit 14 to form the third bypass path BP3. Furthermore, the fourth energization control transistor 24B is connected in series with the fourth LED section 14 to form the fourth bypass path BP4, and the first LED section 11, the second LED section 12, the third LED section 13 and the fourth LED The amount of electricity supplied to the unit 14 is controlled.

The first LED unit 11 is not provided with a bypass path or an energization control unit connected in parallel. This is because the first energization control unit 21 connected in parallel with the second LED unit 12 controls the amount of current in the first LED unit 11. Further, regarding the fourth LED unit 14, the fourth energization control transistor 24B controls the current.
(First current control unit 31)

The first current control unit 31 is a member that controls the first energization control units 21 to the fourth energization control units 24 corresponding to each LED unit to drive the current at an appropriate timing. The first current control unit 31 outputs an operation control signal for controlling the operation of the energization control unit, using the first rectified voltage rectified by the first half-wave rectifier circuit 51 as a reference voltage. As a result, the amount of current on the output line OL detected by the first current detector 41 can be controlled to a value proportional to the rectified voltage. As a result, the input current of the entire circuit has a waveform proportional to the AC input voltage, and harmonics can be suppressed.

A switching element such as a transistor can also be used for the first current control unit 31 in FIG. In particular, a bipolar transistor can be suitably used for detecting the amount of current. However, in this example, the first current control unit 31 is composed of the operational amplifier 31B. Needless to say, the first current control unit is not limited to the operational amplifier, and can be configured by a comparator, a bipolar transistor, a MOSFET, or the like.

In the example of FIG. 6, the first current control unit 31 controls the operation of the energization control transistors 21B to 24B. That is, each current detection operational amplifier controls the amount of energization to switch the energization control transistor to OFF / current control / ON, respectively.
(First current detector 41)

The first current detector 41 is a member for detecting the current energized in the LED assembly 10 in which the LED portions are connected in series by a voltage drop or the like. By detecting the current with the first current detector 41, the current of each LED unit constituting the LED assembly 10 is driven. The first current detector 41 also functions as a protective resistor for the LED. Further, in order to drive the current based on the current detection signal detected by the first current detector 41, the first current detector 41 is connected to the operational amplifier 31B, which is the first current control unit 31 that controls the current circuit. ing. In this circuit example, a kind of constant current circuit is configured by the first energization control unit 21, the second energization control unit 22, the third energization control unit 23, the fourth energization control unit 24, and the first current control unit 31. ..
(First current control signal addition unit 71)

Further, a first current control signal imparting unit 71 is interposed between the first current control unit 31 and each energization control unit. For example, since a potential difference occurs between the operation control signal applied to the first energization control unit 21 and the operation control signal applied to the fourth energization control unit 24, the first energization control is performed by providing the first current control signal application unit 71. It is possible to reliably switch the operation of the unit 21 and the fourth energization control unit 24. Each first current control signal addition unit 71 defines at what current timing each energization control transistor is turned ON / OFF. Here, the current control signal addition Zener diodes 71a, 71b, 71c are used as the first current control signal addition units 71 so that the first to fourth energization control transistors 21B to 24B are turned off in this order as the input voltage rises. Is set and arranged. In the example of FIG. 6, the first current control signal addition unit 71 is composed of a Zener diode, but a resistor, a diode, or the like can also be used.

In the circuit example of FIG. 6, as the input voltage rectified by the first half-wave rectifier circuit 51 rises, the first LED section 11 moves to the second LED section 12, the third LED section 13, and the fourth LED section 14. The amount of energization can be controlled in order. When the input voltage drops, the LEDs are turned off in the reverse order.
(First harmonic suppression signal generation resistors 61a, 61b)

On the other hand, in the circuit example of FIG. 6, the first current control unit 31 is composed of the operational amplifier 31B, and the operational amplifier 31B is controlled by the first harmonic suppression signal generation unit 61. The first harmonic suppression signal generation unit 61 is composed of first harmonic suppression signal generation resistors 61a and 61b. The first harmonic suppression signal generation resistors 61a and 61b divide the rectified voltage rectified by the first half-wave rectifier circuit 51. In other words, the rectified voltage is compressed to an appropriate size. Harmonic suppression signals, which are compressed sine waves output from the first harmonic suppression signal generation resistors 61a and 61b, are input to the + side input terminal of the operational amplifier 31B, which is the first current control unit.
(Constant voltage power supply 31B0)

The operational amplifier 31B is driven by the constant voltage power supply 31B0. The constant voltage power supply 31B0 is composed of an operational amplifier power supply transistor 31B1, a Zener diode 31B2, and a Zener voltage setting resistor 31B3. The constant voltage power supply 31B0 supplies power to the operational amplifier 31B only for a period in which the rectified voltage after the AC power supply AP is rectified by the first half-wave rectifier circuit 51 exceeds the Zener voltage of the Zener diode 31B2. This period is set to include the lighting period of the LED assembly 10. That is, the operational amplifier 31B is operated while the LED assembly 10 is lit to control the lighting.

On the other hand, a voltage which is a current detection signal detected by the first current detection resistor 41 is input to the negative side input terminal of the operational amplifier 31B. The voltage of the first current detection resistor 41 is controlled so as to be current-controlled along a sine wave applied to the + side input terminal of the operational amplifier 31B. In this way, since the current control operation is performed along the sine wave, the LED drive current has a waveform approximated to the sine wave.

The operation of the first circuit group 1 has been described above, but the same applies to the second circuit group 2. That is, in the second half-wave rectification section to which the second rectified voltage is applied, the fifth energization control transistor 25B to the eighth energization control transistor 28B constituting the fifth energization control unit 25 to the eighth energization control unit 28 make the fourth energization control unit 28. The LED unit 14, the third LED unit 13, the second LED unit 12, and the first LED unit 11 are lit and controlled in this order. Further, the fifth energization control transistor 25B to the eighth energization control transistor 28B are output lines OL detected by the second current detector 42 constituting the second current detection resistor 42B by the optotype 32B constituting the second current control unit. It is driven via the current control signal addition Zener diodes 72a, 72b, 72c constituting the second current control signal addition unit 72 based on the current amount of the current, here, the current amount of the fourth LED unit 14. Further, a voltage which is a current detection signal detected by the second current detection resistor 42 is input to the negative side input terminal of the operational amplifier 32B. The voltage of the second current detection resistor 42 is controlled so as to be current controlled along a sine wave applied to the negative side input terminal of the operational amplifier 32B. Therefore, the second harmonic suppression signal generation resistors 62a and 62 constituting the second harmonic suppression signal generation unit 62 are connected to the negative side input terminal of the operational amplifier 32B, and the half-wave rectified second rectified voltage is divided. It is pressed and input. Further, the constant voltage power supply 32B0 constituting the power supply of the operational amplifier 32B is similar to the first circuit group 1 in that it is composed of the operational amplifier power supply transistor 32B1, the Zener diode 32B2, and the Zener voltage setting resistor 32B3.

Each LED unit can be configured by connecting a plurality of light emitting diode elements in series with each other. As a result, the rectified voltage can be effectively divided by the plurality of light emitting diode elements, and the forward voltage Vf and the variation in the temperature characteristics of each light emitting diode element can be absorbed to some extent to make the control in block units uniform. However, the number of LED units and the number of light emitting diode elements constituting each LED unit can be arbitrarily set according to the required brightness, input voltage, etc. For example, the LED unit may be composed of one light emitting diode element, or the LED unit may be used. Needless to say, it is possible to increase the number of LEDs to perform finer control, or conversely, to simplify the control by using only two LED units.

Further, in the above configuration, the number of LED units is 4, but it goes without saying that the number of LED units can be 2 or 3, or 5 or more. In particular, by increasing the number of LED units, it is possible to form a sinusoidal current waveform from a lower power supply voltage, and it is possible to further suppress harmonic components. Further, in the example of FIG. 6, the switching operation in which each LED unit is turned ON / OFF is divided almost evenly with respect to the input current, but it is not always necessary to equalize the switching operation, and the LED unit is switched by different currents. May be good.

Further, in the above example, the LED is divided into four LED parts, and each LED part is configured to have the same Vf, but the Vf does not have to be the same. For example, if the Vf of the LED unit 1 can be set as low as possible, that is, about 3.0 V for one LED, the rising timing of the current can be advanced and the falling timing can be delayed. This is even more advantageous in reducing harmonics. Further, if this method is used, the number of LED units and the Vf setting can be freely selected, and the current waveform can be approximated to a sine wave, so that it becomes easier to further increase the flexibility and realize harmonic suppression.
(Lighting pattern)

Here, for comparison, the LED lighting pattern of the light emitting diode driving device 900 shown in FIG. 7 previously developed by the present inventor and the LED lighting pattern of the light emitting diode driving device 600 according to the first embodiment are shown in FIGS. 8A and 8B. Each is shown in. As shown in these figures, the AC voltage is full-wave rectified using the rectifying circuit 50 of FIG. 7, and the current control unit 20 is based on the energization amount of the output line OL detected by the current detector 40. When lighting and driving the first LED assembly 10 (first LED unit 11 to fourth LED unit 14) connected in multiple stages, the lighting time of the LED unit driven in the region where the rectified voltage is low as shown in FIG. 8A The lighting time of the LED unit, which is long and is driven in a high region, tends to be short. If the lighting time of each LED unit is different, the luminosity of each LED unit is also different. This is because each LED unit starts lighting in order as it gradually increases from the time when the AC power supply voltage is low, and after reaching the maximum voltage, it turns off in the reverse order of the lighting order as it gradually decreases. Is. Therefore, it is inevitable that the lighting period of the LED unit will vary. As a result, there is a problem that flicker occurs and the amount of heat generated varies depending on the lighting time of the LED unit, so that a mechanism for uniformly dissipating heat is required.

On the other hand, in the light emitting diode drive device 600 according to the first embodiment, the LED unit is lit by half-wave rectifying and the circuit is configured so that the order in which the LED unit is lit at each rectified voltage is reversed. The time is uniformed as a whole. Specifically, in a certain half cycle of the frequency cycle of the AC power supply AP, lighting starts in the order of the first LED unit 11 → the second LED unit 12 → the third LED unit 13 → the fourth LED unit 14, and further, the second LED unit. (4) The LED unit 14 → the third LED unit 13 → the second LED unit 12 → the first LED unit 11 are turned off in this order. In the next half cycle, the fourth LED unit 14 → the third LED unit 13 → the second LED unit 12 → the first LED unit 11 starts lighting in this order, and the first LED unit 11 → the second LED unit 12 → the third The lights are turned off in the order of the LED unit 13 → the fourth LED unit 14. By configuring the drive device in this way, the difference in luminosity of each LED unit can be suppressed. As a result, the lighting time of each LED unit is made almost constant to suppress flicker, and the amount of heat generated is also made uniform. Therefore, the heat dissipation mechanism can be the same for each LED unit, and the configuration is simplified. Is planned. Further, by separately preparing a circuit for driving the LED unit in each period of the first rectified voltage and the second rectified voltage, the lighting control can be simplified. In other words, by using a common drive circuit and not performing complicated switching that reverses the current energization direction, it is possible to simplify the circuit configuration and control and realize an inexpensive and highly reliable light emitting diode drive device. ..

Further, when the present inventor conducted a comparative test and made the Vf of each LED unit equal to about 30 V (× 4 stages) in each of FIGS. 3 and 7, the light emitting diode drive device 900 in FIG. 7 was used as an AC power supply AP. Where the power difference between the first LED unit 11 and the fourth LED unit 14 was 40% or more in the similar current waveform drive, in the light emitting diode drive device 300 of FIG. 3, the power of the first LED unit 11 and the second LED unit 12 The difference could be 15%. This makes it possible to eliminate the need to consider the arrangement of the LED elements of each LED unit in consideration of the difference in brightness depending on the mounting location when mounting the LED. Further, due to the power difference between the LED units, an excessive power load is not applied to the LED element of the specific LED unit, and the life of the lamp can be extended. Furthermore, the heat generation of the elements on the light emitting diode drive side and the LED portion side can be made uniform, which is advantageous in the heat dissipation design.
<Example 2>

The light emitting diode driving device 600 according to the first embodiment described above can suppress flicker of light emission by equalizing the length of the lighting time for each LED unit. Further, in order to suppress the flicker of light emission, the first rectified voltage and the second rectified voltage that have been half-wave rectified can be smoothed. An example of such a circuit is shown in FIG. 9 as Example 2. Here, a specific circuit configuration example of the light emitting diode driving device including the smoothing circuit shown in FIG. 5 is shown. In the light emitting diode drive device 700 of FIG. 9, the same members as those of the first embodiment are designated by the same names and reference numerals, and detailed description thereof will be omitted.

The light emitting diode driving device 700 includes a smoothing capacitor 80 as a smoothing circuit. By providing the smoothing capacitor 80, the first rectified voltage and the second rectified voltage that have been half-wave rectified are smoothed, and as a result, the low voltage section is reduced, and the first LED in such a low voltage section is reduced. The section in which the unit 11 and the fourth LED unit 14 are lit becomes longer, and there is an advantage that uneven light emission can be further suppressed. A large-capacity electrolytic capacitor is generally used for the smoothing capacitor 80. However, although the electrolytic capacitor has a large capacity, it deteriorates with time due to evaporation of the electrolytic solution and has a life. Therefore, the life of the light emitting diode drive device is determined by the life of the electrolytic capacitor.

As described above, according to the embodiment of the present invention, it is a conventional problem while being connected to an AC power supply and driven with high efficiency without using a voltage conversion circuit that converts an AC power supply into a direct current by a switching power supply or the like. There is an advantage that the variation in the lighting period for each LED can be suppressed with a relatively simple configuration. That is, since the light emitting diode is a constant voltage element, if the light emitting diode is lit and driven with a rectified voltage obtained by rectifying the AC power supply, the lighting time and power differ for each LED section, and an illuminance difference occurs between the LED sections. It will end up. If all the LED parts are formed on the same package or the same chip, for example, or if a single LED is arranged in a relatively small area, lighting that is relatively far from the area, such as ceiling lighting, With LED bulbs, such an illuminance difference is not noticeable and does not pose a particular problem. However, in applications where LEDs are arranged in a relatively large area and uniform irradiation illuminance is required, for example, backlight illumination and signboard illumination, the illuminance difference tends to be conspicuous. On the other hand, if the lighting period of some LEDs is long, the amount of heat generated increases accordingly, but the amount of heat generated by LEDs having a short lighting time also decreases. If some of the LEDs deteriorate and do not light up, the life of the entire light emitting device will be reached. Therefore, it is necessary to suppress the progress of deterioration of a specific LED. To prevent this, a special heat dissipation mechanism that equalizes the heat dissipation performance is required. On the other hand, in the embodiment of the present invention, the lighting order of the LED unit is not fixed, and the lighting circuit is configured so that the half-wave rectified first rectified voltage and the second rectified voltage are in opposite order to each other. , The lighting time of the LED parts is made uniform. As a result, the difference in illuminance between the LEDs is eliminated, the amount of heat generated is made uniform, the life and reliability of the device are improved, and it can be suitably used as higher quality lighting and fishing lights.

The light emitting diode driving device according to the present invention and the lighting, fishing lamp, and driving method of the light emitting diode driving device using the same can be suitably used as a lighting device and a fishing light. In particular, by suppressing the flicker of the LED portion, it is possible to reduce the discomfort caused by the flicker of the high illuminance illumination light held by the operator working under the LED fishing light.

100, 200, 300, 400, 500, 600, 700, 900 ... Light emitting diode drive device 1 ... First circuit group 2 ... Second circuit group 10 ... First LED assembly 11 ... First LED unit 12 ... Second LED Unit 13 ... Third LED unit 14 ... Fourth LED unit 20 ... Current control unit 21 ... First energization control unit 22 ... Second energization control unit 23 ... Third energization control unit 24 ... Fourth energization control unit 21B ... First Energization control transistor 22B ... Second energization control transistor 23B ... Third energization control transistor 24B ... Fourth energization control transistor 25B ... Fifth energization control transistor 26B ... Sixth energization control transistor 27B ... Seventh energization control transistor 28B ... Eighth energization Control transistor 25 ... Fifth energization control unit 26 ... Sixth energization control unit 27 ... Seventh energization control unit 28 ... Eighth energization control unit 31 ... First current control unit; 31B ... Operater 31B0 ... Constant voltage power supply 31B1 ... Oppressor power supply For transistor 31B2 ... Zener diode 31B3 ... Zener voltage setting resistance 32 ... Second current control unit; 32B ... Opera 32B0 ... Constant voltage power supply 32B1 ... Operator power supply transistor 32B2 ... Zener diode 32B3 ... Zener voltage setting resistance 40 ... Current detector 41 ... First current detector 41B ... First current detection resistance 42 ... Second current detector 42B ... Second current detection resistance 50 ... Rectifier circuit 51 ... First half-wave rectifier circuit 52 ... Second half-wave rectifier circuit 61 ... First 1st harmonic suppression signal generation unit 61a, 61b ... 1st harmonic suppression signal generation resistance 62 ... 2nd harmonic suppression signal generation unit 62a, 62b ... 2nd harmonic suppression signal generation resistance 71 ... 1st current control signal addition unit 71a, 71b, 71c ... Current control signal addition Zener diode 72 ... Second current control signal addition unit 72a, 72b, 72c ... Current control signal addition Zener diode 80 ... Smoothing capacitor 82 ... Bypass capacitor 161, 162, 163, 164, 165 , 166 ... LED block 167 ... Switch control unit 171, 172, 173, 174 ... Light emitting block 177 ... Switch control logic AP ... AC power supply OL ... Output line BP1 ... First bypass path BP2 ... Second bypass path BP3 ... Third bypass Path BP4 ... Fourth bypass path SA, SB ... Switch block SA_1, SA_2, SA_3, SB_1, SB_2, SB_3 ... Switch

Claims (9)

A first half-wave rectifier circuit that is connected to an AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply to obtain the first rectified voltage.
A first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifier circuit.
A second LED unit including at least one LED element, which is connected in series with the first LED unit,
First energization control for controlling the amount of energization to the first LED unit in a state where the first rectified voltage is applied, which is connected in parallel with the second LED unit and in series with the first LED unit. Department and
Second energization for controlling the amount of energization to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. Control unit and
A first current control unit for controlling the first energization control unit and the second energization control unit based on the current value flowing through the first LED unit in a state where the first rectified voltage is applied.
A second unit that is connected to a common AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply at a timing different from that of the first half-wave rectifier circuit to obtain a second rectified voltage. Half-wave rectifier circuit and
A sixth energization control for controlling the amount of energization to the second LED unit in a state where the second rectified voltage is applied, which is connected in parallel with the first LED unit and in series with the second LED unit. Department and
The second half-wave is connected in series with the first LED section between one of the output side to the first LED unit of the rectifier circuit, the first LED unit in a state in which the second rectified voltage is applied and The fifth energization control unit for controlling the amount of energization to the second LED unit and the fifth energization control unit and the fifth energization control unit based on the current value flowing through the second LED unit in a state where the second rectified voltage is applied. The second current control unit for controlling the sixth energization control unit,
Equipped with a light emitting diode drive. The light emitting diode driving device according to claim 1.
The first current control unit in a state where one of the first rectified voltage from the output side is applied the first half-wave rectifier circuit, the turns on the first LED unit, then to turn on the said first LED unit The second LED unit is turned on as it is, and the second LED unit is turned on and driven so as to be turned off while the first LED unit is turned on.
The second current control unit lights the second LED unit and then lights the second LED unit in a state where the second rectified voltage is applied from one output side of the second half-wave rectifier circuit. A light emitting diode driving device in which the first LED unit is lit while the first LED unit is lit, and the first LED unit is lit and driven so as to be turned off while the second LED unit is lit. The light emitting diode driving device according to claim 1 or 2, further
A light emitting diode driving device including a first current detecting unit connected in series with the second LED unit on the downstream side of the second LED unit for detecting the amount of current flowing through the first LED unit. The light emitting diode driving device according to any one of claims 1 to 3, further comprising.
A light emitting diode driving device including a second current detecting unit connected in series with the first LED unit on the upstream side of the first LED unit for detecting the amount of current flowing through the second LED unit. A first half-wave rectifier circuit that is connected to an AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply to obtain the first rectified voltage.
A first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifier circuit.
A second LED unit including at least one LED element, which is connected in series with the first LED unit,
A third LED unit including at least one LED element, which is connected in series with the second LED unit,
First energization control for controlling the amount of energization to the first LED unit in a state where the first rectified voltage is applied, which is connected in parallel with the second LED unit and in series with the first LED unit. Department and
Second energization for controlling the amount of energization to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. Control unit and
Energization of the first LED section, the second LED section, and the third LED section while the first rectifying voltage is applied, which is connected in series with the first LED section, the second LED section, and the third LED section. A third energization control unit for controlling the amount,
With the first rectified voltage applied, the first current for controlling the first energization control unit, the second energization control unit, and the third energization control unit based on the current value flowing through the first LED unit. Control unit and
A second unit that is connected to a common AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply at a timing different from that of the first half-wave rectifier circuit to obtain a second rectified voltage. Half-wave rectifier circuit and
The amount of electricity supplied to the third LED unit when the second rectified voltage is applied, which is connected in series with the third LED unit and in parallel with the second LED unit when viewed from the third LED unit. 7th energization control unit for controlling
Seen from the second LED unit, the second LED unit and the third LED are connected in series with the second LED unit and in parallel with the first LED unit in a state where the second rectifying voltage is applied. The sixth energization control unit for controlling the amount of energization to the unit,
The second half-wave is connected in series with the first LED section between one of the output side to the first LED unit of the rectifier circuit, the first LED unit in a state in which the second rectified voltage is applied, A fifth energization control unit for controlling the amount of energization to the second LED unit and the third LED unit,
In a state in which the second rectified voltage is applied, based on the current value flowing in the third LED unit, the fifth power supply control unit, a sixth power supply control unit, a second current for controlling the seventh power supply controller Control unit and
Equipped with a light emitting diode drive. A first half-wave rectifier circuit that is connected to an AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply to obtain the first rectified voltage.
A first LED unit including at least one LED element connected in series with one output side of the first half-wave rectifier circuit.
A second LED unit including at least one LED element, which is connected in series with the first LED unit,
A third LED unit including at least one LED element, which is connected in series with the second LED unit,
A fourth LED unit including at least one LED element, which is connected in series with the third LED unit,
First energization control for controlling the amount of energization to the first LED unit in a state where the first rectified voltage is applied, which is connected in parallel with the second LED unit and in series with the first LED unit. Department and
Second energization for controlling the amount of energization to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. Control unit and
Energization of the first LED section, the second LED section, and the third LED section while the first rectifying voltage is applied, which is connected in series with the first LED section, the second LED section, and the third LED section. A third energization control unit for controlling the amount,
The first LED unit, the second LED unit, the third LED unit, and the third LED unit connected in series with the first LED unit, the second LED unit, the third LED unit, and the fourth LED unit in a state where the first rectifying voltage is applied. A fourth energization control unit for controlling the amount of energization to the LED unit and the fourth LED unit,
With the first rectified voltage applied, the first energization control unit, the second energization control unit, the third energization control unit, and the fourth energization control unit are controlled based on the current value flowing through the first LED unit. The first current control unit for
A second unit that is connected to a common AC power supply, has a pair of output sides, and half-wave rectifies the AC voltage of the AC power supply at a timing different from that of the first half-wave rectifier circuit to obtain a second rectified voltage. Half-wave rectifier circuit and
Eighth energization control for controlling the amount of energization to the fourth LED unit in a state where the second rectified voltage is applied, which is connected in series with the fourth LED unit and in parallel with the third LED unit. Department and
To control the amount of energization to the third LED section and the fourth LED section in a state where the second rectified voltage is applied, which is connected in series with the third LED section and in parallel with the second LED section. 7th energization control unit and
Energization of the second LED section, the third LED section, and the fourth LED section in a state where the second rectifying voltage is applied, which is connected in series with the second LED section and in parallel with the first LED section. The sixth energization control unit for controlling the amount,
The second half-wave is connected in series with the first LED section between one of the output side to the first LED unit of the rectifier circuit, the first LED unit in a state in which the second rectified voltage is applied, A fifth energization control unit for controlling the amount of energization to the second LED unit, the third LED unit, and the fourth LED unit, and
With the second rectified voltage applied, the fifth energization control unit, the sixth energization control unit, the seventh energization control unit, and the eighth energization control unit are controlled based on the current value flowing through the fourth LED unit. The second current control unit for
Equipped with a light emitting diode drive. The light emitting diode driving device according to any one of claims 1 to 6, further comprising:
A light emitting diode drive device including a smoothing capacitor connected in parallel to an LED aggregate that is a series connection of LEDs including the first LED unit and the second LED unit. A fishing light driven by the light emitting diode driving device according to any one of claims 1 to 7. Lighting driven by the light emitting diode driving device according to any one of claims 1 to 7.

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