JP7435018B2 - Lighting devices and lighting devices - Google Patents

Description

The present disclosure relates to a lighting device and a lighting device.

Patent Document 1 discloses a lighting device including a constant current power source, a light emitting module, and a control section. The light emitting module includes a pair of main terminals connectable to a constant current power source, and one or more light sources connected between the pair of main terminals. Further, an information output section including a resistor that outputs connection information of the light emitting module is connected between the main terminals of the light emitting module. The control section recognizes the connection information of the light emitting module using the current flowing through the resistance of the information output section, and controls the drive of the constant current power supply.

Patent No. 5046067

There are cases where the LED light source of a lighting device is replaced with an LED light source with improved luminous efficiency. At this time, when the LED forward current that was set before the replacement flows, the LED light source after the replacement lights up brighter than before the replacement. In order to keep the brightness constant before and after replacement, it is necessary to take measures such as changing the parts of the lighting circuit of the lighting device.

In the lighting device of Patent Document 1, driving of the constant current power source can be controlled in accordance with the state of the light emitting module. However, no consideration is given to making the brightness constant according to the luminous efficiency. Further, it is necessary to provide the light emitting module with an information output section in advance.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to obtain a lighting device and a lighting device that can suppress differences in brightness between light sources with different luminous efficiencies.

A lighting device according to the present disclosure includes a lighting circuit that lights a light source, a first terminal, a second terminal, and a third terminal, and outputs power from the lighting circuit to the first terminal, the second terminal, or the lighting circuit. An output terminal section for supplying the light source from the first terminal and the third terminal, and a first detection resistor and a second detection resistor connected in series, connects the second terminal and the lighting circuit, and connects the second terminal and the lighting circuit. A series circuit in which a connection point between the first detection resistor and the second detection resistor is electrically connected to the third terminal, and the lighting is performed such that the voltage generated in the series circuit matches a predetermined target value. a control unit that controls the circuit, the lighting circuit includes a control unit that controls the first terminal and the second terminal or The output power is supplied to the light source from the first terminal and the third terminal .

In the lighting device according to the present disclosure, the lighting circuit can be controlled depending on whether the output power of the lighting circuit is supplied to the light source from the first terminal and the second terminal, or when it is supplied to the light source from the first terminal and the third terminal. The detection resistor that detects the voltage used can be changed. Therefore, when using light sources with different luminous efficiencies, the difference in brightness can be suppressed by selecting the terminal to be used from among the output terminal sections.

1 is a diagram illustrating the configuration of a lighting device according to Embodiment 1. FIG. 1 is a circuit block diagram of a lighting device according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating the configuration of a lighting device according to a comparative example. FIG. 3 is a diagram illustrating the configuration of an output terminal section and an input terminal section at the time of shipment of the lighting device according to the first embodiment. FIG. 3 is a diagram illustrating the configuration of the input terminal section when replacing the light source section according to the first embodiment. FIG. 7 is a diagram illustrating the configuration of an input terminal section according to a first modification of the first embodiment. FIG. 7 is a diagram illustrating the configuration of an input terminal section according to a second modification of the first embodiment. FIG. 7 is a circuit block diagram of the lighting device according to Embodiment 2 at the time of shipment. FIG. 7 is a circuit block diagram after the light source section of the lighting device according to Embodiment 2 is replaced.

A lighting device and a lighting device according to each embodiment will be described with reference to the drawings. Identical or corresponding components may be given the same reference numerals and repeated descriptions may be omitted.

Embodiment 1.
FIG. 1 is a diagram illustrating the configuration of a lighting device 100 according to the first embodiment. The lighting device 100 includes a lighting device 10 and a light source section 80 having a light source 85. The lighting device 100 is, for example, a guide light fixture.

The lighting device 10 includes a circuit board 11 . A lighting circuit and an output terminal section, which will be described later, are formed on the circuit board 11. The lighting circuit lights up the light source 85. The output terminal section has a first terminal 51, a second terminal 52, and a third terminal 53. The first terminal 51 is electrically connected to the high potential side output of the lighting circuit.

The lighting device 10 includes a series circuit 12. The series circuit 12 is formed from a first detection resistor Ra and a second detection resistor Rb connected in series. The series circuit 12 connects the second terminal 52 and the ground terminal. The grounding terminal is electrically connected to the low potential side output of the lighting circuit. That is, the series circuit 12 is electrically connected to the low potential side output of the lighting circuit. Further, in the series circuit 12, a connection point between the first detection resistor Ra and the second detection resistor Rb is electrically connected to the third terminal 53.

The output terminal section supplies the output power of the lighting circuit to the light source 85 from the first terminal 51 and the second terminal 52 or the first terminal 51 and the third terminal 53.

One end of the first detection resistor Ra is connected to the control section. Thereby, the control section detects the voltage generated in the series circuit 12. The control unit according to this embodiment is a constant current control unit 19, which will be described later. The control unit includes, for example, a microcomputer.

The light source section 80 is, for example, an LED light source module. The light source section 80 includes a light source board 86 and an input terminal section. A plurality of light sources 85 are mounted on the light source board 86. The input terminal section has a first terminal 81, a second terminal 82, and a third terminal 83. The input terminal section receives the output power of the lighting circuit from the output terminal section of the lighting device 10 .

A light source 85 is connected between the first terminal 81 and the second terminal 82 or between the first terminal 81 and the third terminal 83. The light source 85 is, for example, a light emitting element such as an LED. The plurality of light sources 85 are connected in series. The anode of the light source 85 is connected to the first terminal 81 side, and the cathode is connected to the second terminal 82 and third terminal 83 sides. The light source section 80 may include one or more light sources 85. Furthermore, the plurality of light sources 85 may be connected in parallel or in series and parallel.

Note that in FIG. 1, the cathode of the light source 85 is connected to the second terminal 82 and the third terminal 83. During use, one of the second terminal 82 and the third terminal 83 is connected to the light source 85, and the other is in an open state.

When using the first terminal 51 and the second terminal 52 of the output terminal section, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. At this time, the third terminal 53 and the third terminal 83 are in an open state. When using the first terminal 51 and the third terminal 53 of the output terminal section, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. At this time, the second terminal 52 and the second terminal 82 are in an open state. In this way, the input terminal section of the light source section 80 is electrically connected to one of the second terminal 52 and the third terminal 53 and the first terminal 51.

FIG. 2 is a circuit block diagram of lighting device 100 according to the first embodiment. An external power supply AC is connected to the input side of the lighting device 10 via an input terminal portion CN1. The lighting device 10 is supplied with power from an external power source AC, and lights up the light source 85.

The lighting device 10 includes a lighting circuit 15. The lighting circuit 15 includes a rectifier circuit DB1 and an isolated flyback circuit. The rectifier circuit DB1 is also called a diode bridge. The rectifier circuit DB1 rectifies alternating current power from an external power source AC. A capacitor C1 is connected in parallel to a pair of output ends of the rectifier circuit DB1. One end of the primary side of the transformer T1 is connected to the high potential side of the pair of output ends of the rectifier circuit DB1. The other end of the primary side of the transformer T1 is connected to the control unit IC1.

The control unit IC1 is a flyback control IC. The control unit IC1 has a built-in switching element. The switching element included in the control unit IC1 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The control unit IC1 controls on/off of a built-in switching element to control the current flowing through the transformer T1.

An anode of a diode D1 is connected to the auxiliary winding on the primary side of the transformer T1. The cathode of the diode D1 is connected to the control unit IC1 and the positive electrode of the capacitor C2. The diode D1 supplies power to the control unit IC1 from the auxiliary winding of the transformer T1. The negative electrode of capacitor C2 is connected to a grounding terminal.

A power outage detection unit 16 is connected in parallel with the capacitor C1. A cathode of the diode D1 is connected to the power failure detection section 16.

A photocoupler PC1-1 is connected to the control unit IC1 via a resistor R1. A photocoupler PC1-1 is provided to input information on the secondary side of the transformer T1 to the control unit IC1. A capacitor C3 is connected between the line connecting the resistor R1 and the control unit IC1 and the ground terminal.

An anode of a diode D2 is connected to one end of the flyback winding on the secondary side of the transformer T1. Diode D2 is provided to transmit a stable voltage to the output side. A positive electrode of a capacitor C4 is connected to the cathode of the diode D2. The negative electrode of capacitor C4 is connected to the ground terminal. Further, in the grounding line, the primary side and the secondary side of the transformer T1 are insulated by a capacitor C6.

The anode of a diode D3 is connected to the output of the forward winding on the secondary side of the transformer T1. A capacitor C5 is connected between the cathode of the diode D3 and the ground terminal. A first terminal of the switching element Q1 is connected to the cathode of the diode D3 and the positive electrode of the capacitor C5. The switching element Q1 is, for example, a transistor. When the switching element Q1 is a transistor, the first terminal is the collector, the second terminal is the emitter, and the control terminal is the base. The control terminal is a terminal for switching between the first and second terminals.

One end of a resistor R3 is connected to the control terminal of the switching element Q1. The other end of the resistor R3 is connected to one end of the resistor R2 and the control unit IC2. The other end of resistor R2 is connected to the cathode of diode D3. A resistor R4 is connected between the first terminal and the second terminal of the switching element Q1.

One end of a resistor R5 and a control unit IC2 are connected to the second terminal of the switching element Q1. The positive electrode of the battery 13 is connected to the other end of the resistor R5. The negative electrode of the battery 13 is connected to a grounding terminal.

The control unit IC2 is a charging control unit. The control unit IC2 detects the voltage across the resistor R5. The control unit IC2 controls the current flowing through the resistor R2 so that the voltage across the resistor R5 matches the target value. As a result, the battery 13 is charged with a constant current. The battery 13 is supplied with charging current from the forward winding on the secondary side of the transformer T1 via the switching element Q1.

One end of the coil L1 is connected to the positive electrode of the battery 13. The other end of coil L1 is connected to the anode of diode D6. The cathode of diode D6 is connected to the positive electrode of capacitor C7. The negative electrode of capacitor C7 is connected to the ground terminal. Further, the first terminal 51 is connected to the positive electrode of the capacitor C7 via a diode D5.

A switching element Q2 is connected between the connection point between the coil L1 and the diode D6 and the ground terminal. A first terminal of switching element Q2 is connected to an anode of diode D6. The second terminal of switching element Q2 is connected to the negative electrode of capacitor C7. A control terminal of switching element Q2 is connected to control section IC3. The switching element Q2 is, for example, a MOSFET. Coil L1, diode D6, and switching element Q2 form a booster circuit.

A voltage detection circuit is connected in parallel with capacitor C7. The voltage detection circuit is composed of a resistor R8 and a resistor R9 connected in series. The voltage detection circuit detects the output voltage of a booster circuit formed by coil L1, diode D6, and switching element Q2. The divided voltage values of the resistor R8 and the resistor R9 are input to the control unit IC3. Thereby, the control unit IC3 detects the output voltage of the booster circuit. The control unit IC3 turns on and off the switching element Q2 so that the detected voltage of the voltage detection circuit matches a predetermined target value. Thereby, the control unit IC3 performs constant voltage control on the booster circuit. The booster circuit boosts the voltage of the battery 13 to turn on the light source 85 during a power outage of the external power supply AC.

The anode of the diode D4 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4. A first terminal 51 is connected to the cathode of the diode D4. Further, a constant voltage control section 17 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4 via a series circuit of resistors R6 and R7. A photocoupler PC1-2 is connected to the connection point between the resistors R6 and R7.

Constant voltage control section 17 detects the output voltage on the secondary side of transformer T1 via resistors R6 and R7. The constant voltage control unit 17 calculates a target value of the output voltage on the secondary side of the transformer T1 from the detected voltage. The constant voltage control unit 17 transmits the calculated target value from the photocoupler PC1-2 to the primary side of the transformer T1. This target value is transmitted to the control unit IC1 via the photocoupler PC1-1. The control unit IC1 turns on and off the built-in switching element so that this target value and the output voltage on the secondary side of the transformer T1 match. This provides constant voltage feedback for the isolated flyback circuit.

When power is supplied to the lighting circuit 15 from the external power supply AC, the output voltage on the secondary side of the transformer T1 is supplied to the light source 85 via the diode D4. This turns on the light source 85.

A control power generation circuit 18 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4. The control power generation circuit 18 generates power for the constant voltage control section 17, the control section IC3, and the constant current control section 19 from the output voltage on the secondary side of the transformer T1.

The output terminal portion CN2 is a three-pole connector. The first terminal 51 of the output terminal portion CN2 is electrically connected to the cathode of the diode D4, which is the high potential side output of the lighting circuit 15. The second terminal 52 of the output terminal section CN2 is electrically connected to one end of the first detection resistor Ra and the constant current control section 19. Further, the third terminal 53 of the output terminal portion CN2 is electrically connected to the other end of the first detection resistor Ra and the other end of the second detection resistor Rb. The third terminal 53 is electrically connected to the grounding terminal via the second detection resistor Rb. A first detection resistor Ra is electrically connected between the second terminal 52 and the third terminal 53. The series circuit 12 connects the second terminal 52 and the lighting circuit 15.

When the lighting device 100 is shipped, the light source section 80 is connected to the first terminal 51 and the third terminal 53. That is, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. The second terminal 52 and the second terminal 82 become empty pins. For example, a harness is used to connect the lighting device 10 and the light source section 80.

At this time, the voltage generated across the second detection resistor Rb corresponds to the light source current flowing through the light source section 80. Constant current control section 19 detects the voltage generated in series circuit 12 . Thereby, the constant current control section 19 can detect the voltage generated in the second detection resistor Rb. A predetermined target value is stored in a storage device included in the constant current control section 19. The constant current control unit 19 controls the lighting circuit 15 so that the voltage generated in the series circuit 12 matches a target value.

The constant current control section 19 has an integrated circuit such as a microcomputer. Further, the constant current control section 19 may include a switching element. The switching element included in the constant current control section 19 is, for example, a MOSFET. The constant current control unit 19 controls the current flowing through the light source 85 by turning on and off a built-in switching element. The constant current control section 19 internally presets a target value of the voltage generated in the series circuit 12. The constant current control unit 19 controls the voltage generated in the series circuit 12 using a microcomputer or the like so that the voltage generated in the series circuit 12 matches a target value. The constant current control unit 19 turns on and off a built-in switching element so that the voltage generated in the series circuit 12 matches a target value. As a result, the light source 85 lights up under constant current control.

Further, when the light source section 80 is replaced with a light source section having higher luminous efficiency, the light source section is connected to the first terminal 51 and the second terminal 52. At this time, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. The third terminal 53 and the third terminal 83 become empty pins. A harness that connects the lighting device 10 and the light source section is packaged with the light source board. The harness and light source board are replaced as a set.

At this time, the voltage generated across the series circuit 12 corresponds to the light source current flowing through the light source section. Constant current control section 19 detects the voltage generated in series circuit 12 . The constant current control unit 19 controls the lighting circuit 15 so that the voltage generated in the series circuit 12 matches a predetermined target value. As a result, the light source lights up under constant current control.

FIG. 3 is a diagram illustrating the configuration of a lighting device 800 according to a comparative example. The lighting device 800 includes a lighting device 810 and a light source section 880. The lighting device 810 differs from the lighting device 10 in that it does not include the third terminal 53. That is, the output terminal portion of the lighting device 810 is a two-pole connector. Furthermore, the light source section 880 does not include the third terminal 83. A detection resistor Rc is connected between the second terminal 52 of the lighting device 10 and the ground terminal. The lighting device 810 is controlled so that the voltage generated across the detection resistor Rc matches a target value.

Generally, LEDs are often used as light sources mounted on guide light equipment. The lifespan of an LED is, for example, 40,000 to 60,000 hours. At the end of its lifespan, the light source must be replaced. Generally, the luminous efficiency of LED light sources is improved once every few years. Here, consider replacing the LED light source with an LED light source with improved luminous efficiency. At this time, if constant current control is performed with the same light source current value as before replacement, the LED light source after replacement lights up brighter than before replacement. For example, a 10% improvement in efficiency will increase the brightness of the light source by 10%. At this time, there is a possibility that the luminance limit value of the guide light display surface specified in JIL5502, which is the technical standard for guide light equipment and evacuation guidance systems, may be exceeded.

In contrast, in this embodiment, when the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the second terminal 52, the light source current flows through the first detection resistor Ra and the second detection resistor Rb. At this time, the constant current control unit 19 controls the lighting circuit 15 so that the voltage generated across the series circuit 12 matches the target value.

Further, when the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the third terminal 53, the light source current flows through the second detection resistor Rb. At this time, the constant current control section 19 controls the lighting circuit 30 so that the voltage generated in the second detection resistor Rb matches the target value. The second detection resistor Rb is the one provided on the lighting circuit 15 side between the first detection resistor Ra and the second detection resistor Rb.

In this embodiment, the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the second terminal 52, and from the first terminal 51 and the third terminal 53. , the value of the detection resistor for detecting the light source current can be changed. In constant current control, when the target value of the light source current is the same, the larger the detection resistance, the smaller the light source current becomes. Therefore, when using light sources with different luminous efficiencies, by selecting the terminal to be used from among the second terminal 52 and the third terminal 53, the difference in brightness compared to before replacement can be suppressed. Here, brightness is also called illuminance.

In other words, when using a light source with higher luminous efficiency than before replacement, the difference in brightness compared to before replacement can be suppressed by selecting the terminal of output terminal section CN2 whose detection resistance is larger than before replacement. .

For example, it is assumed that the first detection resistance Ra=1Ω and the second detection resistance Rb=10Ω. At this time, when the light source unit 80 is connected to the first terminal 51 and the third terminal 53 at the time of initial shipment, the detection resistance for detecting the light source current becomes Rb=10Ω. Next, the light source section 80 is replaced with a light source section with higher luminous efficiency, and the new light source section is connected to the first terminal 51 and the second terminal 52. At this time, the detection resistance for detecting the light source current is Ra+Rb=11Ω.

When the target value is the same in constant current control, if the detection resistance increases by 10%, the light source current decreases by about 10%. If the luminous efficiency of the replaced light source section is 10% higher than that of the light source section 80, the increase in brightness due to the luminous efficiency can be canceled by the increase in the detection resistor.

On the other hand, if you are using a light source with lower luminous efficiency than before replacement for some reason, select the terminal whose detection resistance is smaller than before replacement among the output terminals CN2 to reduce the brightness compared to before replacement. Differences can be suppressed.

Furthermore, in this embodiment, there is no need to change the components of the lighting circuit 15 in order to suppress changes in brightness before and after replacing the light source. Therefore, the light source can be easily replaced. Further, it is possible to prevent the brightness of the lighting device 100 from not satisfying standards such as the luminance limit value of the guide light display surface.

The output terminal portion CN2 is not limited to a three-pole connector, and may have four or more terminals. When the output terminal section CN2 has n terminals, the series circuit 12 is formed from m detection resistors connected in series. m=n-1. The second terminal 52 is connected to one end of the series circuit 12, and the output of the lighting circuit 15 is connected to the other end. Connection points of adjacent detection resistors in the series circuit 12 are each connected to one of the terminals of the output terminal portion CN2. In this case, even if the light source is replaced with a light source with higher luminous efficiency multiple times, the difference in brightness compared to before replacement can be suppressed.

Further, in this embodiment, the series circuit 12, the second terminal 52, and the third terminal 53 are provided on the low potential side of the pair of power supply lines of the lighting device 10. However, the present invention is not limited to this, and the series circuit 12, the second terminal 52, and the third terminal 53 may be provided on the higher potential side of the pair of power supply lines. The series circuit 12 may be provided in a portion where the light source current can be detected. In other words, the series circuit 12 may connect the output terminal portion CN2 and the lighting circuit 15.

Further, in this embodiment, even when the light source unit 80 is connected to the first terminal 51 and the third terminal 53, the constant current control unit 19 detects the voltage generated across the series circuit 12, 2. The voltage generated across the detection resistor Rb is detected. As a modification of this example, the constant current control unit 19 connects the first detection terminal electrically connected to one end of the first detection resistor Ra, and also connects the connection point between the first detection resistor Ra and the second detection resistor Rb with an electrical connection point. It is also possible to have a second detection terminal connected to the terminal. The constant current control section 19 may directly detect the voltage generated in the second detection resistor Rb using the detection voltage from the second detection terminal.

Further, in this embodiment, the constant voltage control section 17, the control section IC3, and the constant current control section 19 are provided separately. As a modification of this example, a plurality of the constant voltage control section 17, the control section IC3, and the constant current control section 19 may be formed as one control circuit.

FIG. 4 is a diagram illustrating the configuration of the output terminal section CN2 and the input terminal section CN3 at the time of shipment of the lighting device 100 according to the first embodiment. In the output terminal portion CN2, the first terminal 51, the second terminal 52, and the third terminal 53 are housed inside the casing 54. A protrusion 55 for preventing erroneous connections is formed inside the housing 54 .

The input terminal section CN3 has a housing 64. A groove 65 into which the projection 55 fits is formed in the housing 64 . The input terminal portion CN3 is inserted into the housing 54 of the output terminal portion CN2. Thereby, the input terminal portion CN3 and the output terminal portion CN2 are electrically connected. At this time, the input terminal portion CN3 covers the first terminal 51, the second terminal 52, and the third terminal 53.

When the lighting device 100 is shipped, the input terminal portion CN3 is connected to the wirings 61 and 62 that are electrically connected to the first terminal 81 and the third terminal 83, respectively. The input terminal portion CN3 and the wirings 61 and 62 constitute a harness. The input terminal portion CN3 is electrically connected to the light source board through wirings 61 and 62. At this time, the second terminal 82 is in an open state.

Further, the housings 54 and 64 are provided with projections and depressions to prevent erroneous connections. Therefore, incorrect wiring connections can be prevented. In particular, the terminal on the high potential side can be connected reliably. Moreover, the first terminal 51, the second terminal 52, and the third terminal 53 of the output terminal part CN2 are not exposed due to the input terminal part CN3. Therefore, it is possible to prevent a person from accidentally touching the terminal.

FIG. 5 is a diagram illustrating the configuration of the input terminal section CN3 when replacing the light source section according to the first embodiment. When the light source section is replaced with a light source section with high luminous efficiency, the wirings 61 and 62 electrically connected to the first terminal 81 and the second terminal 82, respectively, are connected to the input terminal section CN3. At this time, the third terminal 83 is in an open state.

Moreover, when the input terminal part CN3 shown in FIG. 5 is connected to the output terminal part CN2 in the opposite direction, the first terminal 81 and the second terminal 82 are connected to the second terminal 52 and the third terminal 53 on the low potential side. Ru. Therefore, it is possible to prevent the light source unit from malfunctioning even in the case of incorrect connection.

FIG. 6 is a diagram illustrating the configuration of the input terminal section CN3 according to the first modification of the first embodiment. The harness attached to the light source board may include wirings 61, 62, and 63 electrically connected to the first terminal 81, second terminal 82, and third terminal 83 of the input terminal portion CN3, respectively. In this case, when connecting the input terminal section CN3 to the output terminal section CN2, the user removes the one of the wirings 62 and 63 that is not used.

FIG. 7 is a diagram illustrating the configuration of the input terminal section CN3 according to the second modification of the first embodiment. The input terminal portion CN3 is electrically connected to one of the second terminal 52 and the third terminal 53 of the output terminal portion CN2 and the first terminal 51. At this time, the input terminal portion CN3 may expose the other of the second terminal 52 and the third terminal 53. The other of the second terminal 52 and the third terminal 53 is a terminal that is in an open state. In the example of FIG. 8, the input terminal portion CN3 covers the first terminal 51 and the second terminal 52 of the output terminal portion CN2, and exposes the third terminal 53.

These modifications can be applied as appropriate to the lighting devices and lighting devices according to the following embodiments. Note that the lighting device and lighting device according to the following embodiments have many features in common with Embodiment 1, so the description will focus on the differences from Embodiment 1.

Embodiment 2.
FIG. 8 is a circuit block diagram of the lighting device 200 according to the second embodiment at the time of shipment. In this embodiment, the configuration of lighting device 210 is different from lighting device 10 of Embodiment 1. The lighting device 210 is supplied with power from an external power source AC and lights the light source 85. The lighting device 210 may be connected to a DC power source. When connecting a DC power source to the lighting device 210, the rectifier circuit DB and the power supply circuit 20, which will be described later, become unnecessary.

The lighting device 210 includes a rectifier circuit DB, a power supply circuit 20, a lighting circuit 30, and a control unit IC21. The rectifier circuit DB rectifies alternating current power from an external power source AC.

The power supply circuit 20 is a PFC (Power Factor Correction) circuit. The power supply circuit 20 is also called a power factor correction circuit. Power supply circuit 20 is connected to the output of rectifier circuit DB. The power supply circuit 20 boosts the pulsating voltage rectified by the rectifier circuit DB, and charges the electrolytic capacitor C21 with a predetermined DC high voltage. The power supply circuit 20 is, for example, a boost circuit such as a boost chopper circuit. The power supply circuit 20 is a switching power supply circuit that generates a voltage across the electrolytic capacitor C21 by turning on and off the first switching element Q21.

In the power supply circuit 20, one end of the coil L21 is connected to the high potential side of the output of the rectifier circuit DB. The drain of the first switching element Q21 and the anode of the first diode D21 are connected to the other end of the coil L21.

The first switching element Q21 is, for example, a MOSFET. The source of the first switching element Q21 is connected to the negative electrode of the electrolytic capacitor C21. The gate of the first switching element Q21 is connected to the MOSFET driver 43. The cathode of the first diode D21 is connected to the positive electrode of the electrolytic capacitor C21.

The negative electrode of the electrolytic capacitor C21 is connected to the low potential side of the output of the rectifier circuit DB. A series circuit of resistors R21 and R22 is connected in parallel with electrolytic capacitor C21. A connection point between the resistors R21 and R22 is connected to the P1 terminal of the control unit IC21.

The output voltage of the power supply circuit 20 is charged to the electrolytic capacitor C21. Resistors R21 and R22 form a voltage dividing circuit that divides the output voltage of the power supply circuit 20. The voltage across the electrolytic capacitor C21 is divided by resistors R21 and R22 and input to the control unit IC21. The control unit IC21 has a storage device. A predetermined voltage target value is stored in the storage device. The control unit IC21 outputs a switching signal that turns on and off the first switching element Q21 so that the output voltage of the power supply circuit 20 matches the voltage target value.

Here, the output voltage of the microcomputer is generally smaller than the drive voltage of the MOSFET. Therefore, the switching signal from the control unit IC21 is input to the MOSFET driver 43. The MOSFET driver 43 turns on and off the first switching element Q21 according to the switching signal. This allows stable switching to be achieved.

A control power supply circuit section 41 is connected to the output of the power supply circuit 20 . The control power supply circuit unit 41 generates a power supply voltage V2 for the MOSFET driver 43 from the output voltage V1 of the power supply circuit 20. Furthermore, a step-down circuit section 42 is connected to the output of the control power supply circuit section 41 . The step-down circuit section 42 generates the power supply voltage VDD for the control section IC21 from the power supply voltage V2. The output of the step-down circuit section 42 is connected to the VDD terminal of the control section IC21. A capacitor C22 is connected between the output of the step-down circuit section 42 and the ground terminal.

A lighting circuit 30 is connected to the electrolytic capacitor C21. The lighting circuit 30 is supplied with power from the electrolytic capacitor C21 and lights the light source 85. The lighting circuit 30 is, for example, a step-down circuit such as a buck converter circuit. In the lighting circuit 30, the drain of the second switching element Q22 is connected to the positive electrode of the electrolytic capacitor C21. The second switching element Q22 is, for example, a MOSFET. The source of the second switching element Q22 is connected to the cathode of the second diode D22 and one end of the coil L22. The gate of the second switching element Q22 is connected to the MOSFET driver 43.

The negative electrode of the electrolytic capacitor C21 and one end of the second detection resistor Rb are connected to the anode of the second diode D22. A positive electrode of a capacitor C23 is connected to the other end of the coil L22. One end of the first detection resistor Ra is connected to the negative electrode of the capacitor C23. The other end of the first detection resistor Ra and the other end of the second detection resistor Rb are connected to each other. Further, one end of the first detection resistor Ra is connected to the P2 terminal of the control unit IC21.

The output terminal portion CN2 is a three-pole connector. The first terminal 51 of the output terminal portion CN2 is electrically connected to the positive electrode of the capacitor C23, which is the high potential side output of the lighting circuit 30. The second terminal 52 of the output terminal section CN2 is electrically connected to one end of the first detection resistor Ra and the P2 terminal of the control section IC21. Further, the third terminal 53 of the output terminal portion CN2 is electrically connected to the other end of the first detection resistor Ra and the other end of the second detection resistor Rb. The third terminal 53 is electrically connected to the grounding terminal via the second detection resistor Rb. A first detection resistor Ra is electrically connected between the second terminal 52 and the third terminal 53.

A light source section 80 is connected in parallel to the series circuit of the capacitor C23 and the first detection resistor Ra. The output voltage of the lighting circuit 30 is smoothed by the capacitor C23 and supplied to the light source section 80. When the lighting device 200 is shipped, the light source section 80 is connected to the first terminal 51 and the third terminal 53.

At this time, the voltage generated across the second detection resistor Rb corresponds to the light source current flowing through the light source section 80. The control unit IC21 detects the voltage generated in the series circuit 12 from the P2 terminal. Thereby, the control unit IC21 can detect the voltage generated in the second detection resistor Rb. A predetermined target value is stored in the storage device of the control unit IC21. The control unit IC21 controls the lighting circuit 30 so that the voltage generated in the series circuit 12 matches the target value.

That is, the control unit IC21 outputs a switching signal that turns on and off the second switching element Q22 so that the voltage generated in the series circuit 12 matches the target value. Similarly to the first switching element Q21, the control unit IC21 turns on and off the second switching element Q22 via the MOSFET driver 43. As a result, the light source 85 lights up under constant current control.

At the time of initial shipment, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. The second terminal 52 and the second terminal 82 become empty pins.

FIG. 9 is a circuit block diagram after the light source section 180 of the lighting device 200 according to the second embodiment is replaced. In the state shown in FIG. 9, the light source section 80 has been replaced with a light source section 180 with high luminous efficiency. The light source section 180 includes a plurality of light sources 185. When replacing the light source section 180, the light source section 180 is connected to the first terminal 51 and the second terminal 52.

At this time, the voltage generated across the series circuit 12 corresponds to the light source current flowing through the light source section 80. The control unit IC21 detects the voltage generated in the series circuit 12 from the P2 terminal. The control unit IC21 controls the lighting circuit 30 so that the voltage generated in the series circuit 12 matches a predetermined target value. As a result, the light source 185 lights up under constant current control.

When replacing the light source section 180, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. The third terminal 53 and the third terminal 83 become empty pins.

In this embodiment, when the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the second terminal 52, the light source current flows through the first detection resistor Ra and the second detection resistor Rb. At this time, the control unit IC21 controls the lighting circuit 30 so that the voltage generated across the series circuit 12 matches the target value.

Further, when the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the third terminal 53, the light source current flows through the second detection resistor Rb. At this time, the control unit IC21 controls the lighting circuit 30 so that the voltage generated in the second detection resistor Rb matches the target value. The second detection resistor Rb is the one provided on the lighting circuit 30 side between the first detection resistor Ra and the second detection resistor Rb.

In this embodiment, the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the second terminal 52, and when it is supplied from the first terminal 51 and the third terminal 53 to the light source. You can change the value of the detection resistor for detecting the light source current. In constant current control, when the target value of the light source current is the same, the larger the detection resistance, the smaller the light source current becomes. Therefore, when using light sources with different luminous efficiencies, by selecting the terminal to be used from among the second terminal 52 and the third terminal 53, the difference in brightness compared to before replacement can be suppressed.

Note that the technical features described in each embodiment may be used in combination as appropriate.

10 lighting device, 11 circuit board, 12 series circuit, 13 battery, 15 lighting circuit, 16 power failure detection section, 17 constant voltage control section, 18 control power generation circuit, 19 constant current control section, 20 power supply circuit, 30 lighting circuit , 41 control power supply circuit section, 42 step-down circuit section, 43 MOSFET driver, 51 first terminal, 52 second terminal, 53 third terminal, 54 housing, 55 protrusion, 61 wiring, 62 wiring, 64 housing, 65 groove , 80 light source section, 81 first terminal, 82 second terminal, 83 third terminal, 85 light source, 86 light source board, 100 lighting device, 180 light source section, 185 light source, 200 lighting device, 210 lighting device, 800 lighting device, 810 lighting device, 880 light source section, AC external power supply, C1, C2, C3, C4, C5, C6, C7 capacitor, C21 electrolytic capacitor, C22, C23 capacitor, CN1 input terminal section, CN2 output terminal section, CN3 input terminal section , D1, D2, D3, D4, D5, D6 Diode, D21 First diode, D22 Second diode, DB, DB1 Rectifier circuit, IC1, IC2, IC3, IC21 Control section, L1, L21, L22 Coil, PC1-1 , PC1-2 Photocoupler, Q1, Q2 Switching element, Q21 First switching element, Q22 Second switching element, R1, R2, R3, R4, R5, R6, R7, R8, R9, R21, R22 Resistor, Ra 1 detection resistor, Rb 2nd detection resistor, Rc detection resistor, T1 transformer

Claims (7)

A lighting circuit that lights up the light source,
An output terminal having a first terminal, a second terminal, and a third terminal, and supplying the output power of the lighting circuit from the first terminal and the second terminal or the first terminal and the third terminal to the light source. Department and
It is formed of a first detection resistor and a second detection resistor connected in series, connects the second terminal and the lighting circuit, and a connection point between the first detection resistor and the second detection resistor is connected to the third terminal. an electrically connected series circuit;
a control unit that controls the lighting circuit so that the voltage generated in the series circuit matches a predetermined target value;
Equipped with
The lighting circuit connects the first terminal and the second terminal, or the first terminal and the third terminal to the A lighting device characterized in that output power is supplied to the light source . When the output power of the lighting circuit is supplied to the light source from the first terminal and the second terminal, the control unit controls the lighting so that a voltage generated across the series circuit matches the target value. When controlling a circuit and supplying the output power of the lighting circuit to the light source from the first terminal and the third terminal, one of the first detection resistor and the second detection resistor is provided on the lighting circuit side. 2. The lighting device according to claim 1, wherein the lighting circuit is controlled so that a voltage generated on the other hand coincides with the target value. The first terminal is electrically connected to a high potential side output of the lighting circuit,
3. The lighting device according to claim 1, wherein the series circuit is electrically connected to a low potential side output of the lighting circuit. The lighting device according to any one of claims 1 to 3,
a light source section having the light source;
A lighting device comprising: The light source section includes an input terminal section that receives the output power of the lighting circuit from the output terminal section,
The lighting device according to claim 4, wherein the input terminal section is electrically connected to one of the second terminal and the third terminal and the first terminal. The lighting device according to claim 5, wherein the input terminal section covers the first terminal, the second terminal, and the third terminal. The lighting device according to claim 5, wherein the input terminal section exposes the other of the second terminal and the third terminal.

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