JP6906174B2 - Lighting device and lighting equipment - Google Patents

Description

The present invention relates to a lighting device and a luminaire, and more particularly to a luminaire for lighting a light source based on a dimming level indicated by a dimming signal from the outside, and a luminaire including the same.

Patent Document 1 discloses an example of a circuit pattern structure of a lighting device mounted on a lighting fixture.

In the circuit pattern structure described in Patent Document 1, an electronic circuit such as a dimming circuit is mounted on a printed circuit board. This printed circuit board has a commercial power supply line from the commercial power input terminal, an instrument grounding part consisting of terminals and lines, and a dimming signal that comes out from the dimming signal input terminal to give a dimming signal to the dimming circuit. Lines and are formed. The distance between the commercial power supply line and the equipment grounding part is less than or equal to the distance between the equipment grounding part and the dimming signal line.

According to the circuit pattern structure of Patent Document 1, even when a surge voltage is generated from the equipment ground portion due to sparkover, the surge voltage is used as the commercial power supply because the commercial power supply line is closer to the equipment ground portion than the dimming signal line. You can escape to the line.

Japanese Patent Application Laid-Open No. 5-217171

In the lighting device, there is a possibility that a surge current may flow through the conductor of the printed circuit board due to static electricity charged on the operator's body during work such as connecting a signal line to the dimming signal input terminal. If the surge current flows through the mounted parts (semiconductor parts) such as integrated circuits constituting the control circuit, the mounted parts may malfunction.

An object of the present invention is to provide a lighting device and a lighting fixture capable of improving the protection performance of mounted parts against static electricity.

The lighting device according to one aspect of the present invention includes a pair of input terminals, a power conversion circuit, a pair of output terminals, a dimming signal input circuit, a control circuit, and a printed circuit board. The pair of input terminals are configured to receive input power from an external power source. The power conversion circuit is configured to convert the input power into a desired DC power. The pair of output terminals are configured to supply the DC power to the light source. The dimming signal input circuit is configured to receive a dimming signal indicating a dimming level from an external device. The control circuit is configured to control the power conversion circuit according to the dimming level indicated by the dimming signal to adjust the DC power to a value corresponding to the dimming level. The printed circuit board is formed with the pair of input terminals, the power conversion circuit, the pair of output terminals, the dimming signal input circuit, and the control circuit. The lighting device includes a surge absorbing unit made of a conductor formed between the dimming signal input circuit and the control circuit on the printed circuit board. The surge absorbing unit is electrically connected to the lead of the surge absorbing element included in the power conversion circuit.

The luminaire according to one aspect of the present invention includes the lighting device and a light source that is electrically connected between the pair of output terminals of the lighting device and is lit by the lighting device.

The present invention has an advantage that it is possible to improve the protection performance of mounted parts against static electricity.

FIG. 1A is a plan view of a main part of a printed circuit board of a lighting device according to an embodiment of the present invention as viewed from the first surface side. FIG. 1B is a view of the portion of the printed circuit board of the lighting device on the second surface side of the main part as viewed from the first surface side. FIG. 2 is a side view of the lighting device of the same. FIG. 3 is a circuit diagram of the lighting device of the same. FIG. 4 is a perspective view of the lighting fixture according to the embodiment of the present invention as viewed from above. FIG. 5 is a perspective view of the same lighting fixture as viewed from below. FIG. 6 is a cross-sectional view of the same lighting fixture. FIG. 7 is an exploded perspective view showing a power supply unit and a mounting plate in the same lighting fixture. FIG. 8 is a side view of the lighting fixture of the same.

Hereinafter, the lighting device 100 and the lighting fixture 1 of the present embodiment will be described with reference to the attached drawings. However, the configuration described in the following embodiments is only an example of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made depending on the design and the like as long as the effects of the present invention can be achieved.

First, the lighting device 100 of the present embodiment will be described with reference to FIGS. 1A to 3. FIG. 1A is a plan view of a main part of the printed circuit board 800 included in the lighting device 100 as viewed from the first surface 80A side. FIG. 1B is a view of the portion of the main part on the second surface 80B side as viewed from the first surface 80A side (without the resin substrate). FIG. 2 is a side view of the lighting device 100. FIG. 3 is a circuit diagram of the lighting device 100. Note that FIGS. 1A and 1B show only a part of the circuit parts mounted on the printed circuit board 800 and a part of the conductors that electrically connect the circuit parts to each other. Further, FIG. 2 shows only a part of the circuit components mounted on the printed circuit board 800.

The lighting device 100 is configured to light the light source unit (light source) 2. As shown in FIG. 3, the lighting device 100 includes a pair of input terminals 11, a pair of output terminals 12, and a lighting circuit 4.

The pair of input terminals 11 are electrically connected to an AC power source (external power source) AC and are configured to receive input power from the AC power source AC. The AC power supply AC is, for example, a commercial AC power supply. Further, the pair of input terminals 11 are electrically connected to the lighting circuit 4.

The pair of output terminals 12 are electrically connected to the lighting circuit 4. Further, the pair of output terminals 12 are configured to be electrically connected to the light source unit (light source) 2. The light source unit 2 is lit by the electric power received from the lighting circuit 4 via the pair of output terminals 12. The light source unit 2 will be described later.

As shown in FIG. 3, the lighting circuit 4 includes a power conversion circuit 400, a dimming signal input circuit 49, and a control circuit 41.

The power conversion circuit 400 is electrically connected to the pair of input terminals 11. Further, the power conversion circuit 400 is electrically connected to the pair of output terminals 12. The power conversion circuit 400 is configured to receive input power from the AC power supply AC via the pair of input terminals 11 and convert the received input power into desired DC power. The power conversion circuit 400 is configured to supply the generated DC power to the light source unit 2 via the pair of output terminals 12.

The dimming signal input circuit 49 includes a dimming signal input terminal 490 (see FIG. 1A) that is electrically connected to an external device. The external device is, for example, a dimmer. The external device (dimmer) outputs, for example, a PWM (Pulse Width Modulation) signal having an on-duty ratio according to the dimming level as a dimming signal. The dimming signal input circuit 49 receives a dimming signal indicating a dimming level from an external device via the dimming signal input terminal 490 and transmits the dimming signal to the control circuit 41.

The control circuit 41 is configured to receive a dimming signal from the dimming signal input circuit 49. The control circuit 41 is electrically connected to the power conversion circuit 400. The control circuit 41 is configured to control the power conversion circuit 400 according to the dimming level indicated by the dimming signal to adjust the DC power to a value corresponding to the dimming level.

The circuit configuration of the lighting circuit 4 (power conversion circuit 400, dimming signal input circuit 49, and control circuit 41) will be described with reference to FIG.

The power conversion circuit 400 includes a back converter 40, a first control power supply circuit 42, a second control power supply circuit 43, a PFC (Power Factor Correction) circuit 44, a filter circuit 45, a full-wave rectifier 46, and a speed-up circuit 47. , PFC drive unit 48 and the like are provided. The power conversion circuit 400 includes a fuse 401 and a surge absorbing element 402 (see FIG. 1A) between the pair of input terminals 11 and the filter circuit 45 as protection circuits.

As shown in FIG. 3, the filter circuit 45 is electrically connected (via a protection circuit) between the pair of input terminals 11. The filter circuit 45 is configured to remove harmonic noise superimposed on the AC voltage / AC current supplied from the AC power supply AC and harmonic noise generated in the PFC circuit 44.

The full-wave rectifier 46 includes a diode bridge. The full-wave rectifier 46 full-wave rectifies the AC voltage and AC current supplied from the AC power supply AC.

The PFC circuit 44 is a conventionally known boost chopper circuit, which converts a pulsating voltage rectified by a full-wave rectifier 46 into a DC voltage having a voltage value higher than the peak value of the pulsating voltage. It is configured to improve power factor. In this PFC circuit 44, the inductor L1, the diode D1, and the smoothing capacitor C1 are electrically connected in series between the pulsating output ends of the full-wave rectifier 46, and the parallel circuit of the two switching elements Q11 and Q12 is the diode D1. It is electrically connected in parallel to the smoothing capacitor C1. The two switching elements Q11 and Q12 are semiconductor switching elements having common electrical characteristics, and are, for example, N-channel power MOSFETs (metal-oxide-semiconductor field-effect transistors). That is, the PFC circuit 44 is configured to include a parallel circuit of the two switching elements Q11 and Q12 to reduce the current flowing through the individual switching elements Q11 and Q12 and suppress the temperature rise. However, since this PFC circuit 44 has a conventionally known circuit configuration except that the two switching elements Q11 and Q12 are connected in parallel, detailed description of the operation will be omitted. In the following description, the output voltage of the PFC circuit 44 (voltage across the smoothing capacitor C1) is referred to as a DC input voltage Vdc.

The back converter 40 is a switching power supply circuit which is also called a step-down chopper circuit. The back converter 40 steps down the DC input voltage Vdc of several hundred volts supplied from the PFC circuit 44 to the DC voltage of several tens of volts (hereinafter referred to as “output voltage V1”) required for the light source unit 2. Is configured. The back converter 40 is composed of two switching elements Q21 and Q22, an inductor T1, a diode D4, a smoothing capacitor C3 and the like. The two switching elements Q21 and Q22 are electrically connected in parallel between the output terminal on the high potential side of the PFC circuit 44 and the output terminal 12 on the high potential side via the inductor T1. The smoothing capacitor C3 is composed of an electrolytic capacitor and is electrically connected between the pair of output terminals 12. That is, the smoothing capacitor C3 is electrically connected in parallel with the light source unit 2. The cathode of the diode D4 is electrically connected to the connection point between the parallel circuit of the switching elements Q21 and Q22 and the inductor T1. The anode of the diode D4 is electrically connected to the output end on the low potential side of the PFC circuit 44 (ground line 4000 which is the reference potential of the power conversion circuit 400). The two switching elements Q21 and Q22 are semiconductor switching elements (for example, N-channel power MOSFETs) having common electrical characteristics. Further, the detection resistor R8 is electrically connected between the anode of the diode D4 and the terminal on the low potential side of the smoothing capacitor C3. However, since the back converter 40 has a conventionally known circuit configuration except that the two switching elements Q21 and Q22 are connected in parallel, detailed description of the operation will be omitted.

The first control power supply circuit 42 is configured to convert a DC input voltage Vdc of several hundred volts into a DC voltage of a dozen volts (for example, 15 volts) (hereinafter referred to as “first control power supply voltage Vcc”). NS. The first control power supply circuit 42 is composed of, for example, a switching power supply circuit such as a back converter or a flyback converter.

Here, the lighting circuit 4 includes a bootstrap circuit that has been well known in the past. The bootstrap circuit is composed of a bootstrap diode D2, a bootstrap capacitor C2, and a series circuit of a plurality of resistors R2 to R6 (hereinafter, referred to as "resistor series circuit"). In the bootstrap diode D2, a first control power supply voltage Vcc is applied to the anode, and one end of the bootstrap capacitor C2 is electrically connected to the cathode. The other end of the bootstrap capacitor C2 is electrically connected to the ground line 4000 via a resistor series circuit. Further, the resistors R3 to R6 are electrically connected in parallel with the diode D4 of the back converter 40. This bootstrap circuit is configured to charge the bootstrap capacitor C2 by the first control power supply voltage Vcc during the off period of the switching elements Q21 and Q22 of the back converter 40. Then, by charging the bootstrap capacitor C2, the drive voltages HVcc of the switching elements Q21 and Q22 can be obtained from the terminals on the high potential side of the bootstrap capacitor C2.

The second control power supply circuit 43 includes a resistor R7, a diode D3, and a Zener diode ZD1. One end of the resistor R7 is electrically connected to the output end on the high potential side of the PFC circuit 44, and the other end of the resistor R7 is electrically connected to the cathode of the Zener diode ZD1 and the anode of the diode D3. The anode of the Zener diode ZD1 is electrically connected to the cathode of the diode D4 of the back converter 40. Then, the cathode of the diode D3 is electrically connected to the terminal on the high potential side of the bootstrap capacitor C2.

The control circuit 41 is configured to execute a first control operation for controlling the PFC circuit 44 and a second control operation for controlling the back converter 40. The control circuit 41 is composed of, for example, an integrated circuit 410 (see FIG. 1A) having a circuit for executing the first control operation and a circuit for executing the second control operation.

In the first control operation, the control circuit 41 operates the PFC circuit 44 so as to maintain the DC input voltage Vdc at a desired target value (for example, a voltage of about 400 volts). That is, the control circuit 41 measures the DC input voltage Vdc by the resistance voltage dividing circuit (series circuit of the resistors R1 and R2), and makes the DC input voltage Vdc match the target value based on the measured value of the DC input voltage Vdc. In addition, the on-duty ratio of the PWM signal is adjusted. This PWM signal is output to the PFC drive unit 48. The PFC drive unit 48 drives, for example, two switching elements Q11 and Q12 on and off at the same time according to the PWM signal.

In the second control operation, the control circuit 41 operates the back converter 40 so that the current (load current) I1 flowing through the light source unit 2 matches the target value. That is, the control circuit 41 measures the load current I1 from the voltage across the detection resistor R8, and turns on the drive signal, which is a PWM signal, so that the load current I1 matches the target value based on the measured value of the load current I1. Adjust the duty ratio. The control circuit 41 dims the light source unit 2 by adjusting the target value of the load current I1 according to the dimming signal given from the external device via the dimming signal input circuit 49.

Here, the drive signal of the control circuit 41 is given to the gates of the switching elements Q21 and Q22 of the back converter 40 via the speed-up circuit 47, respectively. Each speed-up circuit 47 is composed of a PNP type bipolar transistor Tr1, a diode D5, resistors R17 to R19, and the like (see FIG. 3). The resistor R17 is electrically connected between the gate and the source of each of the switching elements Q21 and Q22. The emitter of the bipolar transistor Tr1 is electrically connected to the gate of the switching elements Q21 and Q22, and the collector of the bipolar transistor Tr1 is electrically connected to the source of the switching elements Q21 and Q22 via the resistor R18. Further, the base of the bipolar transistor Tr1 is electrically connected to the anode of the diode D5 and one end of the resistor R19, and the other ends of the resistor R19 of each speedup circuit 47 are electrically connected to the output terminal Ho of the control circuit 41. NS.

In each speed-up circuit 47, when a high-level drive signal is input from the output terminal Ho, the bipolar transistor Tr1 is turned off, and a drive voltage HVcc is applied between the gate and source of the switching elements Q21 and Q22 via the resistor R17. Apply and turn on. Further, in each speed-up circuit 47, when the drive signal from the output terminal Ho is stopped, the bipolar transistor Tr1 is turned on, and the electric charge accumulated in the gates of the switching elements Q21 and Q22 is discharged to turn off. That is, each speed-up circuit 47 is configured to speed up the turn-on of the switching elements Q21 and Q22 made of power MOSFETs.

Further, in the second control operation, the control circuit 41 determines the timing of outputting a high-level drive signal from the output terminal Ho based on the voltage (detection voltage) induced in the inductor T2 magnetically coupled to the inductor T1. is doing. For example, the control circuit 41 is preferably configured to detect the zero cross of the current (inductor current) flowing through the inductor T1 based on the detected voltage and output a drive signal in synchronization with the zero cross.

The dimming signal input circuit 49 is configured to receive a PWM signal (dimming signal) from an external device and transmit it to the control circuit 41. The control circuit 41 is configured to convert the received PWM signal (dimming signal) into a DC voltage signal. The signal level (DC voltage level) of the voltage signal (dimming signal) generated by the control circuit 41 corresponds to the output level (dimming level) indicated by the PWM signal from the external device. The control circuit 41 adjusts the target value of the load current I1 to a value corresponding to the signal level (dimming level) of the voltage signal (dimming signal).

Here, in the lighting circuit 4 of the present embodiment, the dimming signal input circuit 49 is configured to transmit a dimming signal to the control circuit 41 via the photocoupler 90. That is, the control circuit 41 is electrically isolated from the dimming signal input circuit 49, and is configured to receive the dimming signal from the dimming signal input circuit 49 via the photocoupler 90.

Further, the lighting circuit 4 of the present embodiment includes a timer circuit. As shown in FIG. 3, the timer circuit is composed of a CR integrator circuit of resistors R13 to R15 and a capacitor C4. This timer circuit is configured such that a series circuit of resistors R13 to R15 is electrically connected in parallel with the smoothing capacitor C3 and the detection resistor R8, and the low-side resistor R15 and the capacitor C4 are electrically connected in parallel. Since the voltage across the capacitor C4 gradually rises from the time when the AC power supply AC is turned on, the control circuit 41 elapses from the time when the AC power supply AC is turned on based on the voltage across the capacitor C4 (hereinafter referred to as "timer signal"). You can know the time. As shown in FIG. 3, a series circuit of resistors R9 to R12 may be electrically connected in parallel to the timer circuit.

Further, in the lighting circuit 4 of the present embodiment, the GND terminal (grounding line 4000) of the control circuit 41 is grounded via a series circuit of two capacitors C11 and C12 for noise reduction.

Next, the basic operation of the lighting device 100 will be described.

When the AC power supply AC is turned on, the first control power supply circuit 42 is activated to generate the first control power supply voltage Vcc. When the first control power supply voltage Vcc reaches the rated value (for example, 15 volts), the control circuit 41 is activated to execute the first control operation. The control circuit 41 monitors the elapsed time from the time when the AC power supply AC is turned on, based on the timer signal.

When the control circuit 41 executes the first control operation, the PFC circuit 44 operates and the DC input voltage Vdc reaches the rated value. When the first control power supply voltage Vcc reaches the rated value, the bootstrap circuit operates normally, and a predetermined drive voltage HVcc is given to the control circuit 41.

The control circuit 41 starts the second control operation when it is determined that a predetermined time has elapsed since the DC input voltage Vdc reached the rated value based on the timer signal. When the control circuit 41 starts the second control operation, the output voltage V1 of the back converter 40 gradually rises, and the load current I1 starts to flow when the lighting start voltage of the light source unit 2 is exceeded. Then, the control circuit 41 controls (feedback control) the back converter 40 so that the load current I1 is a constant value. Therefore, the lighting circuit 4 can light the light source unit 2 with a desired brightness (light output).

The lighting circuit 4 is configured by mounting a plurality of types of circuit components on a printed wiring board 80 (see FIGS. 1A, 1B, and 2). The printed wiring board 80 of the present embodiment is a double-sided printed wiring board having a conductor pattern on both sides. Each of the plurality of types of circuit components has a plurality of metal leads. In each of the plurality of types of circuit components, a plurality of leads are inserted into a plurality of through holes penetrating the printed wiring board 80 in the thickness direction from one side in the thickness direction of the printed wiring board 80. Then, the plurality of leads are soldered to the conductor formed on the printed wiring board 80. As a result, each of the plurality of types of circuit components is electrically connected to the conductor.

The plurality of types of circuit components constitute a plurality of first circuit components 811 for forming the dimming signal input circuit 49, a plurality of second circuit parts 812 for forming the control circuit 41, and a power conversion circuit 400. Includes a plurality of third circuit components 813 for. Further, the plurality of types of circuit components include an input connector 110 having a pair of input terminals 11 and an output connector having a pair of output terminals 12. The printed wiring board 80 is mounted with the above-mentioned plurality of types of circuit components (a plurality of first circuit components 811 and a plurality of second circuit components 812, a plurality of third circuit components 813, an input connector 110, and an output connector). A printed circuit board 800 is configured (see FIGS. 1A, 1B, 2).

The plurality of first circuit components 811 are electrically connected by a first conductor 821 formed on the printed circuit board 800. The dimming signal input circuit 49 is composed of the plurality of first circuit components 811 and the first conductor 821.

As shown in FIGS. 1A, 1B, and 2, the plurality of first circuit components 811 include a dimming signal input terminal 490 for electrically connecting a signal line from an external device, a diode bridge 491, and the like. The dimming signal input terminal 490 includes a pair of leads 4901. The pair of leads 4901 are electrically connected to the first conductor 821. The diode bridge 491 includes two pairs of leads (a pair of leads 4911 on the input side and a pair of leads 4912 on the output side). The two pairs of leads 4911 and 4912 are electrically connected to the first conductor 821.

The dimming signal input circuit 49 has a first exposed conductor portion. The first exposed conductor portion is a portion of the metal portion (lead) of the plurality of first circuit components 811 and the first conductor (including solder) 821 that is exposed to the outside air. For example, the lead 4901 of the dimming signal input terminal 490, the leads 4911 and 4912 of the diode bridge 491, and the portion of the first conductor 821 that is not covered with the insulating resin (solder resist) are the first exposed conductors. It is a department.

The plurality of second circuit components 812 are electrically connected by a second conductor 822 formed on the printed circuit board 800. The control circuit 41 is composed of the plurality of second circuit components 812 and the second conductor 822.

As shown in FIG. 1A, the plurality of second circuit components 812 include integrated circuits 410 and the like. The integrated circuit 410 includes a plurality of leads 4101. The plurality of leads 4101 are electrically connected to the second conductor 822.

The control circuit 41 has a second exposed conductor portion. The second exposed conductor portion is a portion of the metal portion (lead) of the plurality of second circuit components 812 and the second conductor (including solder) 822 that is exposed to the outside air. For example, the reed 4101 of the integrated circuit 410 and the portion of the second conductor 822 that is not covered with the insulating resin is the second exposed conductor portion.

The plurality of third circuit components 813 are electrically connected by a third conductor 823 formed on the printed circuit board 800. The power conversion circuit 400 is composed of the plurality of third circuit components 813 and the third conductor 823.

As shown in FIG. 1A, the plurality of third circuit components 813 include a fuse 401, a surge absorbing element 402, and the like. The fuse 401 includes a pair of leads 4011. The pair of leads 4011 are electrically connected to the third conductor 823. The surge absorbing element 402 includes a pair of leads 4021. The pair of leads 4021 are electrically connected to the third conductor 823.

The power conversion circuit 400 has a third exposed conductor portion. The third exposed conductor portion is a portion of the metal portion (lead) of the plurality of third circuit components 813 and the third conductor (including solder) 823 that is exposed to the outside air. For example, the reed 4011 of the fuse 401, the reeds 4021 and 4022 of the surge absorbing element 402, and the portion of the third conductor 823 that is not covered with the insulating resin is the third exposed conductor portion.

In FIGS. 1A and 1B, a conductor (including solder) formed on the printed circuit board 800 and exposed to the outside air is shown by dot hatching.

Further, the control circuit 41 is electrically connected to the power conversion circuit 400 by a conductor formed on the printed circuit board 800 (hereinafter, referred to as a “control conductor”). For example, the integrated circuit 410 and the speed-up circuit 47, and the integrated circuit 410 and the PFC drive unit 48 are electrically connected by different control conductors, respectively.

On the other hand, the control circuit 41 is electrically isolated from the dimming signal input circuit 49, and is configured to receive a dimming signal from the dimming signal input circuit 49 via the photocoupler 90. The photocoupler 90 includes a light emitting element 91 and a light receiving element 92. The light emitting element 91 is, for example, a light emitting diode, and the light receiving element 92 is, for example, a photodiode. The light emitting element 91 and the light receiving element 92 are enclosed in one package. Here, the plurality of first circuit components 811 for forming the dimming signal input circuit 49 include the light emitting element 91 of the photocoupler 90. On the other hand, the plurality of second circuit components 812 for forming the control circuit 41 include the light receiving element 92 of the photocoupler 90.

As shown in FIG. 1B, the photocoupler 90 includes two pairs of leads (a pair of leads 901 on the input side and a pair of leads 902 on the output side). The pair of leads 901 on the input side are electrically connected to the light emitting element 91. The pair of leads 901 on the input side are electrically connected to the first conductor 821. Further, the pair of leads 902 on the output side are electrically connected to the light receiving element 92. The pair of leads 902 on the output side are electrically connected to the second conductor 822.

The light emitting element 91 repeatedly turns on and off at the on-duty ratio of the dimming signal (PWM signal) from the dimming signal input circuit 49, and the light receiving element 92 receives the light from the light emitting element 91 to obtain the dimming signal. A dimming signal is transmitted from the input circuit 49 to the control circuit 41.

The input connector 110 is electrically connected to the power conversion circuit 400 via an input side conductor 824 formed on the printed circuit board 800. An external power supply line is electrically connected to the input connector 110 (a pair of input terminals 11) via, for example, the first terminal block 33 of the lighting fixture 1 described later.

The output connector is electrically connected to the power conversion circuit 400 via an output side conductor 825 (see FIG. 3) formed on the printed circuit board 800. The light source unit 2 is electrically connected to the output connector (pair of output terminals 12) via, for example, the output cable of the lighting fixture 1 described later.

The printed circuit board 800 is held by a metal plate 70 for heat dissipation (see FIG. 2). In the metal plate 70, an insulating member (insulating sheet) 75 is arranged on the surface facing the printed circuit plate 800.

As shown in FIGS. 1A and 1B, the dimming signal input circuit 49 and the control circuit 41 are formed adjacent to each other on the printed circuit board 800. That is, on the printed circuit board 800, the first circuit component 811 and the second circuit component 812 are arranged next to each other, and the first exposed conductor portion and the second exposed conductor portion are arranged next to each other. There is.

Here, in the present embodiment, as shown in FIG. 1A, the first exposed conductor portion (lead 4901 of the dimming signal input terminal 490) and the second exposed conductor portion (second exposed conductor portion) on the first surface 80A of the printed circuit board 800. A conductor 826 is formed between the circuit component 812) and the circuit component 812). The conductor 826 is exposed to the outside air. The conductor 826 is electrically connected to one lead 4021 of the surge absorbing element 402. Then, the conductor 826 passes through the portion of the printed circuit board 800 on the first surface 80A side of the region where the diode bridge 491 is arranged on the second surface 80B side, and the end portion of the printed wiring board 80 (the upper end of FIG. 1A). It extends to the part).

The conductor 826 is formed so that the shortest distance L10 between the conductor 826 and the first exposed conductor portion is shorter than the shortest distance L20 between the first exposed conductor portion and the second exposed conductor portion. .. The distance between the exposed conductors referred to here is a spatial distance (physical distance) between the exposed conductors. The shortest distance L20 between the first exposed conductor portion and the second exposed conductor portion is the shortest distance between the first exposed conductor portion and the second exposed conductor portion on the first surface 80A and the shortest distance on the second surface 80B. This is the shorter of the shortest distances between the first exposed conductor portion and the second exposed conductor portion. In the lighting device 100 of the present embodiment, the shortest distance L10 between the conductor 826 and the first exposed conductor portion is between the conductor (solder) around one lead 4901 of the dimming signal input terminal 490 and the conductor 826. Is the spatial distance of (see FIG. 1A). Further, in the lighting device 100 of the present embodiment, the shortest distance L20 between the first exposed conductor portion and the second exposed conductor portion is the conductor (solder) around one lead 4901 of the dimming signal input terminal 490. , The space distance between the lead of the third circuit component 813 arranged closest to the dimming signal input terminal 490.

In the present embodiment, the second conductor 822 (see FIG. 1B) that electrically connects the lead 902 on the output side of the photocoupler 90 and the integrated circuit 410 is covered with an insulating resin (solder resist). , Does not contribute to the shortest distance between the first exposed conductor and the second exposed conductor. Further, in the lighting device 100 of the present embodiment, the shortest distance L10 between the conductor 826 and the first exposed conductor portion (lead 4901 of the dimming signal input terminal 490) is the lead 901 and the lead 902 of the photocoupler 90. It is shorter than the distance between them (see FIG. 1B).

In the lighting device 100, for example, a large voltage that cannot be insulated by the spatial distance between the first exposed conductor portion and the second exposed conductor portion may be applied to the dimming signal input circuit 49. For example, when the operator is charged (static electricity) when connecting the signal line to the dimming signal input terminal 490, a surge voltage is generated due to this static electricity, and the operator There is a possibility that a surge current may flow from the finger or the like to the lighting device 100 (dimming signal input terminal 490). In the lighting device 100 of the present embodiment, even in such a case, the surge voltage caused by static electricity is such that the distance between the first exposed conductor portion (lead 4901) and the first exposed conductor portion is the second exposed conductor. It will occur with the conductor 826, which is closer than the part. Therefore, it is difficult for a surge current due to static electricity to flow through the control circuit 41, and it is possible to improve the protection performance of the control circuit 41 (integrated circuit 410), which is prone to malfunction due to the surge current. That is, the conductor 826 of the present embodiment functions as a surge absorbing unit that suppresses the inflow of surge current into the circuit component.

Next, the lighting fixture 1 of the present embodiment will be described with reference to FIGS. 4 to 7. In the following, unless otherwise specified, the vertical, horizontal, and front-rear directions of the luminaire 1 will be described by defining them using the up-down, left-right, and front-back arrows shown in FIG.

The lighting fixture 1 of the present embodiment is a so-called high ceiling lighting fixture.

As shown in FIG. 4, for example, the luminaire 1 of the present embodiment includes a power supply unit 3 including the lighting device 100, a light source unit (light source) 2 lit by the power supply unit 3, a power supply unit 3, and a light source unit. It includes an instrument main body 6 for holding 2 and an arm 5.

The light source unit 2 includes an LED module 20, a unit cover 21, and a heat radiating member 22 (see FIGS. 4 and 6). The LED module 20 is configured by mounting a plurality of LEDs (Light Emitting Diodes) on the lower surface of a rectangular substrate 200. The plurality of LEDs are preferably, for example, white LEDs for lighting.

The heat radiating member 22 is composed of a base plate 220 and a plurality of heat radiating plates 221. The base plate 220 and the plurality of heat radiating plates 221 are preferably formed of an aluminum or amyl alloy plate material. The base plate 220 is formed in the shape of a rectangular plate. The LED module 20 is attached to the lower surface of the base plate 220. The substrate 200 of the LED module 20 is screwed to the base plate 220 with the mounting surface (lower surface) on which a plurality of LEDs are mounted facing downward (see FIG. 6). The plurality of heat radiating plates 221 are attached to the upper surface of the base plate 220 side by side in the front-rear direction and the left-right direction (see FIG. 4). That is, the heat generated by the plurality of LEDs is conducted from the base plate 220 to the plurality of heat radiating plates 221 and radiated to the atmosphere from the plurality of heat radiating plates 221.

The unit cover 21 is formed of a translucent synthetic resin (polycarbonate resin, acrylic resin, or the like) into a flat rectangular box shape. The unit cover 21 is attached to the lower surface of the base plate 220 so as to cover the LED module 20 (see FIG. 6).

As shown in FIGS. 4 and 5, the instrument main body 6 has a mounting plate 60, a pair of side plates 61, and a pair of connecting plates 62. The mounting plate 60 is formed in a rectangular shape by a metal plate such as a zinc steel plate. Each of the pair of side plates 61 is formed in a trapezoidal shape when viewed from the front-rear direction (see FIGS. 4 to 6). However, each side plate 61 is provided with two ventilation holes 610. Each side plate 61 is provided with an arm support portion 611 between two ventilation holes 610 penetrating in the thickness direction. Each of the pair of connecting plates 62 is elongated in the front-rear direction, and the shape seen from the front-rear direction is formed in an L shape (see FIG. 6). The pair of side plates 61 and the pair of connecting plates 62 are preferably formed of metal plates such as galvanized steel plates. The pair of connecting plates 62 connect both ends of the pair of side plates 61 in the longitudinal direction on the longer bottom side (lower side). Further, the mounting plate 60 is fixed on the shorter bottom side (upper side) of the pair of side plates 61. The instrument body 6 is formed in a quadrangular pyramid shape with the lower surface and both left and right sides open by a mounting plate 60, a pair of side plates 61, and a pair of connecting plates 62. The light source unit 2 is housed inside the fixture body 6, and is placed on a support piece 612 protruding from the lower side of each of the pair of side plates 61 and a base plate 220 on each lower piece 620 of the pair of connecting plates 62. Is supported on the instrument body 6 so as to be placed (see FIGS. 4 to 6). Here, the unit cover 21 of the light source unit 2 projects downward from the lower surface of the instrument body 6 through the opening 63 on the lower surface of the instrument body 6 (see FIG. 5).

The arm 5 is formed of a metal plate such as a zinc steel plate into a narrow U-shape (see FIG. 4). A pair of bolt insertion holes penetrate each of both ends of the arm 5 in the longitudinal direction. The upper bolt insertion hole is formed in a circular shape, and the lower bolt insertion hole 50 is formed in an arcuate oval shape (see FIG. 5). The arm 5 is rotatably supported by the arm support portion 611 of each side plate 61 of the instrument main body 6 with the first bolt 51 as the rotation axis by the first bolt 51 inserted into the upper bolt insertion hole. However, the rotation range of the arm 5 is limited to the range in which the second bolt 52 inserted into the lower bolt insertion hole 50 can move in the bolt insertion hole 50.

As shown in FIGS. 6 and 7, the power supply unit 3 includes a case 30, a cover 31, a lighting device 100, a first terminal block 33, a second terminal block 34, and the like.

An output cable is electrically connected to the output connector (output terminal 12) of the lighting device 100. This output cable is pulled out of the case 30 through an insertion hole 600 (see FIGS. 6 and 7) penetrating the mounting plate 60 of the instrument body 6 in the vertical direction, and is electrically connected to the LED module 20 of the light source unit 2. Connected to. The DC power output from the pair of output terminals 12 of the lighting device 100 is supplied to the LED module 20 via the output cable. A bushing 322 for holding the output cable is fitted in the insertion hole 600 of the mounting plate 60 (see FIG. 6).

The case 30 is made of a metal plate such as a zinc steel plate. The case 30 has a four-sided (rectangular) top plate 300 and four side plates protruding downward from the four sides of the top plate 300 (the short side on the right side, the short side on the left side, and the long side on the front side of the top plate 300). , The first to fourth side plates 301 to 304) protruding from the long side on the rear side, respectively. The four side plates 301 to 304 of the case 30 are integrally formed with the top plate 300 by bending a rectangular plate material connected to the four sides of the top plate 300 downward at a substantially right angle. A lighting device 100 is attached to the lower surface of the top plate 300 (see FIG. 6).

The two terminal blocks (first terminal block 33 and second terminal block 34) are attached to the first side plate 301. Two insertion holes 305 are provided side by side in the vertical direction at substantially the center of the first side plate 301 in the front-rear direction (see FIG. 7).

The first terminal block 33 is a terminal block for a power supply line, and is arranged in front of the insertion hole 305 on the outer surface of the first side plate 301. However, the first terminal block 33 is for electric wires connected to the input connector 110 (input terminal 11) of the lighting device 100 with a plurality of (six) first outlets 330 for external power supply lines facing forward. The second outlets 331 (six) are arranged so as to face rearward (see FIGS. 6 and 7).

The second terminal block 34 is a terminal block for signal lines, and is arranged behind the insertion hole 305 on the outer surface of the first side plate 301. However, the second terminal block 34 is for an electric wire connected to the dimming signal input terminal 490 of the lighting device 100 with a plurality of (4) first outlets 340 for signal lines from an external device facing rearward. (4) of the second outlets 341 are arranged so as to face forward (see FIGS. 6 and 8). An electric wire extending from the input connector 110 and inserted into the second insertion port 331 of the first terminal block 33 is inserted into the upper insertion hole 305. Further, an electric wire extending from the dimming signal input terminal 490 and inserted into the second insertion port 341 of the second terminal block 34 is inserted into the lower insertion hole 305.

The case 30 is attached to the mounting plate 60. Specifically, the insertion pieces 3020 provided at the front end and the rear end of the lower end edge of the second side plate 302 are inserted under the bridge 602 of the mounting plate 60. Then, the first fixing piece 3010 provided on the lower end edge of the first side plate 301 and the second fixing piece 3021 provided on the lower end edge of the second side plate 302 are inserted into the screw holes 603 and 604 of the mounting plate 60. Screw each. As a result, the case 30 is fixed to the mounting plate 60 (see FIGS. 4, 6 and 7).

The cover 31 is formed of a metal plate such as a zinc steel plate in a box shape in which the bottom wall 311 has a rectangular shape having substantially the same dimensions as the first side plate 301 of the case 30 (see FIG. 6). A rectangular plate-shaped fixing portion 314 projects to the right from the center in the longitudinal direction on the lower side of the bottom wall 311. Further, a circular screw insertion hole 3140 penetrates through the center of the fixing portion 314. The screw portion 361 of the fixing screw 36 is inserted into the screw insertion hole 3140 from top to bottom. Then, on the lower surface side of the fixing portion 314, the washer 37 is fitted into the screw portion 361 and the fixing screw 36 is prevented from coming off from the screw insertion hole 3140 (see FIG. 7).

Shaft holes 3120 and 3130, which are oval elongated holes whose longitudinal direction is the vertical direction, penetrate through the upper ends of the side walls 312 and 313 on the front and rear sides of the cover 31, respectively (see FIG. 7). Then, the mounting screws 35 inserted through the shaft holes 3120 and 3130 are screwed into the screw holes provided in the upper right corners of the third side plate 303 and the fourth side plate 304 of the case 30, respectively. The mounting screw 35 has a cylindrical portion without threads between the head and the threaded portion, and the length of the cylindrical portion is longer than the thickness of the metal plate forming the cover 31. As a result, the cover 31 is rotatably attached to the case 30 with the two mounting screws 35 (cylindrical portions) as rotation axes. Further, since the two shaft holes 3120 and 3130 are oval elongated holes, the cover 31 is slidable with respect to the case 30 along the longitudinal direction of the two shaft holes 3120 and 3130.

As described above, the cover 31 attached to the case 30 has a position (closed position; FIG. 4) in which the fixing portion 314 comes into contact with the instrument body 6 (mounting plate 60) and covers the first terminal block 33 and the second terminal block 34. (See) and the position (open position) where the first terminal block 33 and the second terminal block 34 are exposed. Further, the cover 31 is screwed (fixed) to the instrument main body 6 by fitting the screw portion 361 of the fixing screw 36 into the female screw portion 601 (see FIG. 7) provided on the mounting plate 60 at the closed position. (See FIG. 4).

The work of connecting the external electric wires (power supply line and signal line) to the first insertion port 330 of the first terminal block 33 and the first insertion port 340 of the second terminal block 34 is, for example, the lighting fixture 1 (the fixture main body 6). ) Is installed in the desired position of the building. The luminaire 1 is installed on the ceiling of the gymnasium by fixing the arm 5 to, for example, a beam on the ceiling of the gymnasium.

Here, when the operator performs the work of connecting the signal line to the first insertion port 340 of the second terminal block 34, if the operator is charged (charged with static electricity), the operator's finger Therefore, there is a possibility that a surge current due to static electricity will flow through the lighting device 100 via the second terminal block 34. Since the voltage generated by static electricity may reach, for example, about 10 kV, if this current flows through the integrated circuit 410 of the control circuit 41, the integrated circuit 410 may malfunction.

On the other hand, in the lighting device 100 and the lighting fixture 1 of the present embodiment, the conductor 826 is formed between the dimming signal input circuit 49 (first exposed conductor portion) and the control circuit 41 (second exposed conductor portion). Has been done. Therefore, the surge current that has flowed into the dimming signal input terminal 490 is more likely to flow to the conductor 826 than to the second exposed conductor portion. As a result, the surge current is less likely to flow to the integrated circuit 410 or the like of the control circuit 41, and it is possible to improve the protection performance of the mounted components of the integrated circuit 410 or the like.

Some of the modifications of this embodiment are listed below. The above embodiment and the following modifications can be combined as appropriate.

In the above embodiment, the conductor 826 is electrically connected to the third conductor 823, but in one modification, the conductor 826 may be electrically connected to the input side conductor 824 or the output side conductor 825. .. In one modification, the third conductor 823 (or the input side conductor 824 or the output side conductor 825) is formed on the printed circuit board 800 so as to be located between the first conductor 821 and the second conductor 822. You may.

In one modification, a surge absorbing portion made of a conductor may be formed between the dimming signal input circuit 49 and the control circuit 41 also on the second surface 80B of the printed circuit board 800.

The luminaire 1 is not limited to the luminaire for high ceilings, and may be any luminaire. In one modification, the luminaire 1 may be a luminaire such as a road light or a street light, a luminaire directly attached to or embedded in a wall surface or a ceiling, or a ceiling-hung type luminaire.

As is clear from the above-described embodiment, the lighting device (100) of the first aspect includes a pair of input terminals (11), a power conversion circuit (400), and a pair of output terminals (12). It includes an optical signal input circuit (49), a control circuit (41), and a printed circuit board (800). The pair of input terminals (11) are configured to receive input power from an external power supply (AC). The power conversion circuit (400) is configured to convert input power into desired DC power. The pair of output terminals (12) are configured to supply DC power to the light source (light source unit 2). The dimming signal input circuit (49) is configured to receive a dimming signal indicating a dimming level from an external device. The control circuit (41) is configured to control the power conversion circuit (400) according to the dimming level indicated by the dimming signal to adjust the DC power to a value corresponding to the dimming level. A pair of input terminals (11), a power conversion circuit (400), a pair of output terminals (12), a dimming signal input circuit (49), and a control circuit (41) are formed on the printed circuit board (800). ing. The lighting device (100) includes a surge absorbing unit made of a conductor (826) formed between the dimming signal input circuit (49) and the control circuit (41) on the printed circuit board (800).

According to this configuration, even if a surge current flows into the dimming signal input circuit (49) from an operator's finger or the like, this surge current is more likely to flow into the surge absorbing portion than the control circuit (41). As a result, it is possible to suppress the surge current from flowing from the dimming signal input circuit (49) to the control circuit (41), and it is possible to improve the protection performance of the mounted components against static electricity.

In the lighting device (100) of the second aspect, in the first aspect, the dimming signal input circuit (49) is composed of a plurality of first circuit components (811) and a first conductor (821). NS. The plurality of first circuit components (811) include a dimming signal input terminal (490) to which an external device is electrically connected. The first conductor (821) is formed on a printed circuit board (800) and electrically connects a plurality of first circuit components (811) to each other. Further, the dimming signal input circuit (49) has a first exposed conductor portion. The first exposed conductor portion is a portion of the metal portion of the plurality of first circuit components (811) and the first conductor (821) that is exposed to the outside air. The control circuit (41) is composed of a plurality of second circuit components (812) and a second conductor (822). The second conductor (822) is formed on the printed circuit board (800) and electrically connects a plurality of second circuit components (812) to each other. Further, the control circuit (41) has a second exposed conductor portion. The second exposed conductor portion is a metal portion of the plurality of second circuit components (812) and a portion of the second conductor (822) that is exposed to the outside air. The power conversion circuit (400) is composed of a plurality of third circuit components (813) and a third conductor (823). The third conductor (823) is formed on the printed circuit board (800) and electrically connects a plurality of third circuit components (813) to each other. Further, the power conversion circuit (400) has a third exposed conductor portion. The third exposed conductor portion is a metal portion of the plurality of third circuit components (813) and a portion of the third conductor (823) that is exposed to the outside air. The power conversion circuit (400) is electrically connected to a pair of input terminals (11) via an input side conductor (824) formed on a printed circuit board (800). The power conversion circuit (400) is electrically connected to a pair of output terminals (12) via an output side conductor (825) formed on a printed circuit board (800). The first exposed conductor portion and the second exposed conductor portion are arranged adjacent to each other on the printed circuit board (800). A surge absorbing portion (conductor 826) is formed between the first exposed conductor portion and the second exposed conductor portion on the printed circuit board (800).

According to this configuration, even if a surge current flows into the first exposed conductor portion (first conductor 821) from the operator's finger or the like via the dimming signal input terminal (490), this surge current is second exposed. It is easier to flow into the surge absorbing part than the conductor part (second conductor 822, etc.). As a result, it is possible to suppress the surge current from flowing from the first exposed conductor portion to the second exposed conductor portion, and it is possible to improve the protection performance of the mounted component against static electricity.

In the lighting device (100) of the third aspect, in the second aspect, the shortest distance (L10) between the first exposed conductor portion and the surge absorbing portion (conductor 826) is set between the first exposed conductor portion and the second. It is shorter than the shortest distance (L20) from the exposed conductor portion.

According to this configuration, it is possible to further suppress the surge current from flowing from the first exposed conductor portion to the second exposed conductor portion.

In the lighting device (100) of the fourth aspect, in the second or third aspect, the surge absorbing unit (conductor 826) is the input side conductor (824), the third conductor (823), and the output side conductor (825). ) Is electrically connected to at least one of them.

According to this configuration, the surge current can flow to the power conversion circuit (400) composed of circuit components having a higher withstand voltage than the integrated circuit of the control circuit (41), and the control circuit (41) can be fed. It is possible to improve the protection performance.

The lighting device (100) of the fifth aspect is a photocoupler (90) that transmits a dimming signal from the dimming signal input circuit (49) to the control circuit (41) in any one of the first to fourth aspects. To be equipped. The dimming signal input circuit (49) includes a light emitting element (91) of the photocoupler (90). The control circuit (41) includes a light receiving element (92) of the photocoupler (90).

According to this configuration, the dimming signal input circuit (49) and the control circuit (41) can be electrically isolated, and the protection performance of the control circuit (41) can be improved.

The luminaire (1) of the sixth aspect is electrically connected between the lighting device (100) of any one of the first to fifth aspects and a pair of output terminals (12) of the lighting device (100). A light source (light source unit 2) that is lit by the lighting device (100) is provided.

According to this configuration, even if a surge current flows into the dimming signal input circuit (49) from an operator's finger or the like, this surge current is more likely to flow into the surge absorbing portion than the control circuit (41). As a result, it is possible to suppress the surge current from flowing from the dimming signal input circuit (49) to the control circuit (41), and it is possible to improve the protection performance of the mounted components against static electricity.

1 Lighting equipment 2 Light source unit (light source)
11 Input terminal 12 Output terminal 400 Power conversion circuit 41 Control circuit 49 Dimming signal input circuit 490 Dimming signal input terminal 90 Photocoupler 91 Light emitting element 92 Light receiving element 800 Printed circuit board 811 1st circuit part 812 2nd circuit part 813 3 Circuit parts 821 1st conductor 822 2nd conductor 823 3rd conductor 824 Input side conductor 825 Output side conductor 826 Conductor (surge absorber)
100 Lighting device AC External power supply L10 Shortest distance L20 Shortest distance

Claims (6)

A pair of input terminals configured to receive input power from an external power source,
A power conversion circuit configured to convert the input power into a desired DC power,
A pair of output terminals configured to supply the DC power to the light source,
A dimming signal input circuit configured to receive a dimming signal indicating the dimming level from an external device,
A control circuit configured to control the power conversion circuit according to the dimming level indicated by the dimming signal to adjust the DC power to a value corresponding to the dimming level.
The pair of input terminals, the power conversion circuit, the pair of output terminals, the dimming signal input circuit, and the printed circuit board forming the control circuit.
With
A surge absorbing unit made of a conductor formed between the dimming signal input circuit and the control circuit on the printed circuit board is provided .
The surge absorbing portion, the lighting apparatus characterized by that is electrically connected to the leads of the surge absorbing element included in the power conversion circuit. The dimming signal input circuit includes a plurality of first circuit components including a dimming signal input terminal to which the external device is electrically connected, and the plurality of first circuit components formed on the printed circuit board. It is composed of a first conductor that is electrically connected, and has a metal portion of the plurality of first circuit components and a first exposed conductor portion of the first conductor that is exposed to the outside air. And
The control circuit is composed of a plurality of second circuit components and a second conductor formed on the printed circuit board and electrically connecting the plurality of second circuit components to each other. It has a metal part of two circuit parts and a second exposed conductor part of the second conductor that is exposed to the outside air.
The power conversion circuit is composed of a plurality of third circuit components and a third conductor formed on the printed circuit board and electrically connecting the plurality of third circuit components to each other. It has a metal part of the third circuit component and a third exposed conductor part of the third conductor that is exposed to the outside air.
The power conversion circuit is electrically connected to the pair of input terminals via an input side conductor formed on the printed circuit board, and the pair of power conversion circuits are electrically connected to the pair of input terminals via an output side conductor formed on the printed circuit board. Is electrically connected to the output terminal of
The first exposed conductor portion and the second exposed conductor portion are arranged adjacent to each other on the printed circuit board.
The lighting device according to claim 1, wherein the surge absorbing portion is formed between the first exposed conductor portion and the second exposed conductor portion on the printed circuit board. 2. The second aspect of the present invention, wherein the shortest distance between the first exposed conductor portion and the surge absorbing portion is shorter than the shortest distance between the first exposed conductor portion and the second exposed conductor portion. Lighting device. The lighting device according to claim 2 or 3, wherein the surge absorbing unit is electrically connected to at least one of the input side conductor, the third conductor, and the output side conductor. .. A photocoupler for transmitting the dimming signal from the dimming signal input circuit to the control circuit is provided.
The dimming signal input circuit includes a light emitting element of the photocoupler.
The lighting device according to any one of claims 1 to 4, wherein the control circuit includes a light receiving element of the photocoupler. The lighting device according to any one of claims 1 to 5,
A light source that is electrically connected between the pair of output terminals of the lighting device and is lit by the lighting device.
Lighting equipment characterized by being equipped with.

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