JP2016162499A - Lighting device and luminaire using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can suppress a disadvantage that a light source lights up instantaneously at the power shutdown time or reclosing time.SOLUTION: A first capacitor C1 is connected between output terminals T5 and T6 of a power conversion circuit 4 for converting an input voltage from the external to a DC voltage having a desired voltage value. Second capacitor C2 generates an operation power source of a control circuit based on the input voltage from the external. The capacitances of the first capacitor C1 and the second capacitor C2 are set so that a first time when the charge amount of the first capacitor C1 is not more than an operation power source of the light source 9 is shorter than a second time when the charge amount of the second capacitor C2 is not more than an operation power source of the control circuit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device and a lighting fixture using the lighting device, and more particularly to a lighting device that performs dimming control of a light source and a lighting fixture using the lighting device.

  2. Description of the Related Art Conventionally, a lighting device that performs dimming control of a light source has been provided (see, for example, Patent Document 1). The lighting device described in Patent Literature 1 includes a power supply circuit, a step-down chopper circuit (power conversion circuit), a control circuit, and a control power supply circuit.

  The power supply circuit includes a fuse, a filter circuit, and a rectifying / smoothing circuit, and converts an AC voltage input from a commercial power supply to generate a DC voltage. The step-down chopper circuit includes an inductor, a switching element, a diode, and a first capacitor formed of an electrolytic capacitor, and steps down a DC voltage input from a power supply circuit to a DC voltage suitable for a light source.

  The control circuit includes a control integrated circuit, and adjusts the light source by increasing or decreasing the duty ratio of the switching element of the step-down chopper circuit, for example. The control power supply circuit has a second capacitor and a Zener diode connected in parallel with each other, generates a control power supply voltage set to the Zener voltage of the Zener diode, and outputs the control power supply voltage to the control circuit.

JP 2012-94276 A

  By the way, in the lighting device described in the above-mentioned Patent Document 1, if a charge remains in the first capacitor when the power is shut off or when the power is turned on again, the light source may be lit for a moment due to the charge.

  In order to solve the above-mentioned problems, there is also provided a lighting device in which the charge remaining in the first capacitor is rapidly reduced by a discharge path formed by a transistor, a Zener diode, a resistor, or the like. However, in this lighting device, a transistor, a Zener diode, a resistor, and the like are necessary to form a discharge path, which increases the cost accordingly.

  Therefore, in order to suppress an increase in cost, a lighting device in which a discharge resistor is connected in parallel with the first capacitor is also provided. However, in this lighting device, the electric charge remaining in the first capacitor can be rapidly reduced by reducing the resistance value of the discharge resistor, but wasteful power is consumed in a steady state. Further, when the resistance value of the discharge resistor is increased in this lighting device, the power consumption in the steady state can be suppressed, but the charge remaining in the first capacitor cannot be rapidly reduced.

  The present invention has been made in view of the above problems, and provides a lighting device and a lighting fixture using the same, which suppresses an increase in cost and reduces a problem that a light source is lit for a moment when the power is turned off or the power is turned on again. The purpose is to do.

  The lighting device of the present invention includes a power conversion circuit that converts an external input voltage into a DC voltage having a desired voltage value, a first capacitor connected between output terminals of the power conversion circuit, and a first light source together with a light source. A constant current circuit connected in series between both ends of the capacitor; a control circuit for controlling the operation of the power conversion circuit and the constant current circuit; and a second for generating an operating power supply for the control circuit based on the input voltage. A first time until the amount of charge stored in the first capacitor becomes equal to or lower than the operating power supply of the light source in a state where the supply of the input voltage is cut off, is stored in the second capacitor. The capacities of the first capacitor and the second capacitor are respectively set so that the amount of the charged electric charge is shorter than the second time until the operating power of the control circuit becomes lower than the operating power. To.

  The lighting fixture of this invention is equipped with the above-mentioned lighting device, the light source which lights by the electric power feeding from the said lighting device, The fixture main body holding the said lighting device and the said light source, It is characterized by the above-mentioned.

  According to the configuration of the present invention, it is possible to provide a lighting device and a lighting apparatus using the lighting device that can reduce an inconvenience that the light source is turned on for a moment when the power is turned off or the power is turned on again while suppressing an increase in cost. effective.

It is a circuit diagram which shows an example of the lighting device which concerns on embodiment of this invention. It is a circuit diagram which shows an example of the constant current circuit used for the lighting device which concerns on embodiment of this invention. FIG. 3A is a time chart for explaining the operation of the conventional lighting device, and FIG. 3B is a time chart for explaining the operation of the lighting device according to the embodiment of the present invention. It is a disassembled perspective view which shows an example of the lighting fixture which concerns on embodiment of this invention. It is a whole perspective view which shows an example of the lighting fixture which concerns on embodiment of this invention.

  The lighting device 10 and the lighting fixture 20 according to the embodiment of the present invention will be specifically described with reference to FIGS. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment. Therefore, various modifications other than this embodiment can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  As shown in FIG. 1, the lighting device 10 of the present embodiment includes a power conversion circuit 4, a constant current circuit 5, a dimming signal circuit 6, and a first capacitor C <b> 1 and a second capacitor C <b> 2 made of electrolytic capacitors. Prepare. The lighting device 10 preferably further includes an input filter 2, a rectifier circuit 3, a control power supply circuit 7, a phase detection circuit 8, input terminals T1 and T2, and output terminals T3 and T4.

  The commercial power source 1 is connected to the input terminals T1 and T2 via the dimmer 30, and the AC voltage from the commercial power source 1 phase-controlled by the dimmer 30 is supplied to the lighting device 10 via the input terminals T1 and T2. Entered. A light source 9 is connected to the output terminals T3 and T4, and a DC voltage output from the power conversion circuit 4 is applied to the light source 9 through the constant current circuit 5.

  The input filter 2 is composed of, for example, a surge voltage absorbing element, a capacitor, and a common mode choke coil. The input filter 2 removes AC voltage noise supplied from the commercial power source 1 and noise generated in the internal circuit is commercial power source 1. Remove so that it does not flow to the side.

  The rectifier circuit 3 has a so-called diode bridge composed of four diodes D3 to D6, and rectifies the AC voltage input from the input filter 2 into a pulsating voltage.

  As shown in FIG. 1, the power conversion circuit 4 is, for example, a flyback converter having a power factor correction (PFC) function, and includes a driver IC 40, a transformer 41, and a voltage feedback circuit 42. A capacitor C3 that smoothes the pulsating voltage input from the rectifier circuit 3 is connected between the input terminals of the power conversion circuit 4.

  The driver IC 40 is, for example, an LED driver IC (LC5540LD series: manufactured by Sanken Electric Co., Ltd.) in which a power MOSFET and a control IC are incorporated in one package.

  The transformer 41 includes a primary winding 410, a secondary winding 411, and an auxiliary winding 412. One end on the winding start side of the primary winding 410 is connected to the output terminal on the high voltage side of the rectifier circuit 3, and the other end on the winding end side of the primary winding 410 is connected to the drain of the power MOSFET of the driver IC 40. The source of the power MOSFET is connected to the output terminal on the low voltage side of the rectifier circuit 3, and the gate of the power MOSFET is connected to the control IC.

  A series circuit of a diode D1 and a first capacitor C1 is connected between both ends of the secondary winding 411, and a discharging resistor R1 is connected between both ends of the first capacitor C1. The cathode of the diode D1 is connected to the output terminal T5 of the power conversion circuit 4, and the negative side of the first capacitor C1 is connected to the low-voltage side output terminal of the rectifier circuit 3. That is, the first capacitor C1 is connected between the output terminals T5 and T6 of the power conversion circuit 4.

  One end on the winding end side of the auxiliary winding 412 is connected to the positive side of the second capacitor C2 via a series circuit of a resistor R2 and a diode D2, and the other end on the winding start side of the auxiliary winding 412 is a low voltage of the rectifier circuit 3. Connected to the output terminal on the side. Further, the negative electrode side of the second capacitor C2 is connected to the ground (GND) of the dimming signal circuit 6, the control power supply circuit 7, and the phase detection circuit 8. That is, in this embodiment, the induced electromotive force generated in the auxiliary winding 412 is used as the operating power supply for the driver IC 40 and the control power supply circuit 7, and a part of this operating power supply is stored in the second capacitor C2.

  In the state where the power supply from the commercial power source 1 is cut off, the driver IC 40 and the control are controlled during the time corresponding to the capacity of the second capacitor C2 (second time described later) by the charge stored in the second capacitor C2. Power can be supplied to the power supply circuit 7. That is, in this embodiment, even if power supply from the commercial power supply 1 is cut off, dimming control by the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 is possible for a second time described later. In this embodiment, the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 constitute a control circuit.

  The voltage feedback circuit 42 is a negative feedback circuit using, for example, an operational amplifier, and a voltage signal corresponding to the magnitude of the current flowing through the detection resistors R3 and R4 (see FIG. 2) of the constant current circuit 5 is input from the constant current circuit 5. Then, a signal corresponding to the voltage signal is output to the driver IC 40. In the driver IC 40, the control IC adjusts the duty ratio of the power MOSFET so that the output signal (voltage value) from the voltage feedback circuit 42 approaches the target value.

  As shown in FIG. 2, the constant current circuit 5 includes an operational amplifier 51, a switching element Q2, and detection resistors R3 and R4. The switching element Q2 is, for example, an N-channel MOSFET, and is turned on / off according to a voltage signal output from the operational amplifier 51.

  The output terminal of the dimming signal circuit 6 is connected to the non-inverting input terminal of the operational amplifier 51 through the resistor R5, and a control signal described later output from the dimming signal circuit 6 is input. The inverting input terminal of the operational amplifier 51 is connected to the source of the switching element Q2 and one end of the detection resistors R3 and R4. The gate of the switching element Q2 is connected to the output terminal of the operational amplifier 51, and the switching element Q2 is turned on / off according to the voltage signal output from the operational amplifier 51.

  The other ends of the detection resistors R3 and R4 are connected to the output terminal T6 of the power conversion circuit 4 and are connected to the drain of the switching element Q2 via the capacitor C4. Further, the drain of the switching element Q2, which is the output terminal of the constant current circuit 5, is connected to the output terminal T4 and to the input terminal of the voltage feedback circuit 42.

  A capacitor C5 is connected between the other ends of the detection resistors R3 and R4 and the non-inverting input terminal of the operational amplifier 51, and a resistor R6 is connected between the inverting input terminal and the output terminal of the operational amplifier 51. .

  The phase detection circuit 8 detects the phase of the AC voltage from the commercial power source 1 that is phase-controlled according to the dimming level set by the dimmer 30 provided outside, and the dimming corresponding to the detected phase The level PWM signal is output to the dimming signal circuit 6.

  The dimming signal circuit 6 generates a control signal for controlling the dimming level of the light source 9 by integrating the PWM signal input from the phase detection circuit 8, and outputs the generated control signal to the constant current circuit 5. Then, the constant current circuit 5 turns on / off the switching element Q2 in accordance with the control signal input from the dimming signal circuit 6, and controls the current flowing through the light source 9 to be constant.

  The control power supply circuit 7 operates by an induced electromotive force generated in the auxiliary winding 412 of the transformer 41 in a state where power is supplied from the commercial power supply 1, and the constant current circuit 5, the dimming signal circuit 6, and the phase detection circuit described above. 8 and the voltage feedback circuit 42 of the power conversion circuit 4 are supplied with power. That is, even when the power supply from the commercial power supply 1 is cut off, the constant current circuit 5, the dimming signal circuit 6, the phase detection circuit 8, and the voltage feedback circuit 42 can be operated by the power supply from the second capacitor C2.

  The light source 9 is configured by connecting a plurality of light emitting diodes (LEDs) in series, for example, and is connected between the output terminals T3 and T4. The light source 9 is lit at a dimming level corresponding to the current value when a current controlled to a constant value by the constant current circuit 5 flows.

  The dimmer 30 has an operation unit for setting the dimming level of the light source 9, and controls the phase of the AC voltage output from the commercial power source 1 according to the dimming level set by the operation unit. . In the dimmer 30, the light source 9 can be turned off by operating the operation unit. When the light source 9 is turned off, power supply from the commercial power source 1 to the lighting device 10 is interrupted.

  Next, the operation of the conventional lighting device and the lighting device 10 of this embodiment when the light source 9 is turned off (when the power is shut off) will be specifically described with reference to FIGS. 3A and 3B. First, the operation of the conventional lighting device will be described.

  When the light source 9 is turned off by the operation unit of the dimmer 30 at time t1, the dimmer 30 cuts off the power supply from the commercial power supply 1 to the lighting device 10. Therefore, the phase detection circuit 8 cannot detect the phase of the AC voltage output from the commercial power supply 1 and stops outputting the PWM signal. The dimming signal circuit 6 stops outputting the control signal because the PWM signal from the phase detection circuit 8 is not input. As a result, the constant current circuit 5 stops the constant current control for the light source 9, whereby the current flowing through the light source 9 becomes 0A, and the light source 9 is turned off.

  The driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 are operated by the electric charge stored in the second capacitor C2 after time t1, so that the output voltage Vcc of the second capacitor C2 decreases with time ( (See FIG. 3A). Further, after time t1, the charge stored in the first capacitor C1 is consumed by the resistor R1, and therefore the output voltage VDC of the first capacitor C1 also decreases with time (see FIG. 3A).

  When the output voltage Vcc of the second capacitor C2 becomes Vmin at time t2, the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 become inoperable, and the dimming control cannot be maintained. At this time, since the output voltage VDC of the first capacitor C1 is higher than the turn-onable voltage Vf of the light source 9, a current flows through the light source 9 at time t3, so that the light source 9 is turned on momentarily. At this time, the output voltage VDC of the first capacitor C1 rapidly decreases due to the current flowing through the light source 9, and becomes 0V (see FIG. 3A).

  Subsequently, the operation of the lighting device 10 of the present embodiment will be described.

  When the light source 9 is turned off by the operation unit of the dimmer 30 at time t1, the dimmer 30 cuts off the power supply from the commercial power supply 1 to the lighting device 10. Therefore, the phase detection circuit 8 cannot detect the phase of the AC voltage output from the commercial power supply 1 and stops outputting the PWM signal. The dimming signal circuit 6 stops outputting the control signal because the PWM signal from the phase detection circuit 8 is not input. As a result, the constant current circuit 5 stops the constant current control for the light source 9, whereby the current flowing through the light source 9 becomes 0A, and the light source 9 is turned off.

  The driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 are operated by the electric charge stored in the second capacitor C2 after time t1, so that the output voltage Vcc of the second capacitor C2 decreases with time ( (See FIG. 3B). Further, after time t1, the charge stored in the first capacitor C1 is consumed by the resistor R1, and therefore the output voltage VDC of the first capacitor C1 also decreases with time (see FIG. 3B).

  By the way, in the present embodiment, the first time until the output voltage VDC = Vf of the first capacitor C1 becomes shorter than the second time until the output voltage Vcc = Vmin of the second capacitor C2 becomes shorter. The capacities of the first capacitor C1 and the second capacitor C2 are set. In the example shown in FIG. 3B, the first time T1 = (t4-t1) and the second time T2 = (t5-t1) (t5> t4).

  Therefore, at time t4 when the output voltage VDC of the first capacitor C1 becomes VDC = Vf, the output voltage Vcc of the second capacitor C2> Vmin, and the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 are operable. Therefore, the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 are not disabled when the output voltage VDC of the first capacitor C1 is higher than the turn-on voltage Vf of the light source 9, and the light source is turned off when it is turned off. It is possible to reduce the problem that 9 is lit for a moment.

  After time t5, the driver IC 40, the dimming signal circuit 6, and the phase detection circuit 8 become inoperable, and the dimming control cannot be maintained.

  Since the operation when the light source 9 is turned on again (when the power is turned on again) is the same as when the light is turned off, the operation when the light source is turned on again is omitted.

  FIG. 4 is an exploded perspective view of the lighting fixture 20 using the lighting device 10 described above, and FIG. 5 is an overall perspective view of the lighting fixture 20. In the following description, unless otherwise specified, the front / rear, left / right, and upper / lower directions are defined in FIG. Therefore, in the present embodiment, the longitudinal direction of the printed wiring board 90 of the light source 9 is the front-rear direction, the width direction of the printed wiring board 90 is the left-right direction, and the thickness direction of the printed wiring board 90 is the vertical direction.

  The lighting fixture 20 of this embodiment is provided with the light source 9, the lighting device 10, and the fixture main body 11 as shown in FIG. The lighting fixture 20 preferably further includes a cover 12, a top plate 13, a pair of end caps 14, a case 15, and terminal blocks 16 and 17.

  The light source 9 has a printed wiring board 90 formed in a rectangular plate shape that is long in the front-rear direction, and a plurality of light emitting diodes 91 are mounted in a line along the front-rear direction on the surface (lower surface) of the printed wiring board 90. Has been. Further, a groove 900 formed in an elliptical shape is provided at the left end of the printed wiring board 90 and substantially in the center in the front-rear direction, and is similarly formed in an elliptical shape near the right end of the printed wiring board 90 and both ends in the front-rear direction. Each groove 900 is provided.

  The lighting device 10 includes a printed wiring board 100 formed in a rectangular plate shape that is long in the front-rear direction. On the surface (upper surface) of the printed wiring board 100, the electronic components 101 constituting the input filter 2, the rectifier circuit 3, the power conversion circuit 4, the constant current circuit 5, the dimming signal circuit 6, and the control power circuit 7 are mounted. Has been.

  The instrument body 11 is an extruded product made of, for example, an aluminum alloy, and includes a bottom plate 110 formed in a rectangular plate shape that is long in the front-rear direction and a pair of side plates 111 that protrude upward from both ends of the bottom plate 110 in the left-right direction. It is formed in a letter shape. The bottom plate 110 is provided with a screw hole 1100 into which the screw 18 is screwed in a position overlapping the groove 900 in a state where the printed wiring board 90 of the light source 9 is attached. Further, insertion grooves 1101 are provided over the entire length of the bottom plate 110 near both ends in the left-right direction.

  In addition, the end cap 14 formed in a rectangular shape with, for example, a synthetic resin is attached to both ends of the instrument body 11 in the front-rear direction with screws 19.

  The cover 12 is made of a light-transmitting material such as acrylic resin, and has a curved surface portion 120 that is curved downward and a pair of attachment portions 121 that protrude upward from both ends of the curved surface portion 120 in the left-right direction. . The cover 12 is attached to the instrument main body 11 by sliding from the front-rear direction with respect to the instrument main body 11 and inserting the tip of each attachment portion 121 into the corresponding insertion groove 1101.

  At this time, the lower surface (mounting surface) of the printed wiring board 90 attached to the instrument main body 11 is covered with the curved surface portion 120, and the light emitted from the light emitting diode 91 passes through the curved surface portion 120 and passes through the lower illumination space. Is irradiated.

  The top plate 13 is formed by, for example, bending a sheet metal, and includes a rectangular plate-shaped main portion 130 that is long in the front-rear direction, and a pair of attachment pieces 131 that are respectively provided at both ends in the front-rear direction of the main portion 130. Have. Each attachment piece 131 is provided with an attachment hole 1310 made of a long hole, and the top plate 13 can be attached to the ceiling surface with a screw passed through the attachment hole 1310. Also, rectangular openings 1300 for drawing power lines, signal lines, and the like exposed from the ceiling surface are provided near both ends of the main portion 130 in the front-rear direction.

  The printed wiring board 100 constituting the above-described lighting device 10 is attached to the case 15 and is housed inside the appliance main body 11 together with the case 15. The case 15 includes a bottom plate 150 formed in a rectangular plate shape long in the front-rear direction, a pair of first side plates 151 projecting upward from both ends in the front-rear direction of the bottom plate 150, and a second projecting upward from the right end of the bottom plate 150. The side plate is formed in a box shape whose left side surface and top surface are open.

  Each first side plate 151 is integrally provided with a rectangular attachment piece 152 formed by cutting and raising a part, and each attachment piece 152 has a screw for attaching the case 15 to the instrument body 11. An insertion hole 1520 to be inserted is provided.

  The terminal block 16 includes a container body 160 formed in a rectangular parallelepiped shape, and a connection terminal having a so-called quick connection terminal structure is accommodated in the container body 160. In addition, a pair of electric wire insertion holes 1600 arranged side by side in the left-right direction are provided on one surface (front surface) of the vessel body 160, and the connection terminals described above are arranged so as to face each electric wire insertion hole 1600. Since the terminal block 17 has the same structure, the description of the terminal block 17 is omitted.

  For example, in the present embodiment, the connection terminal of the rear terminal block 16 is electrically connected to the input side of the printed wiring board 100 via a lead wire, and the connection terminal of the front terminal block 17 is connected to the printed wiring board 100 via a lead wire. Is electrically connected to the output side. And each core wire of the power cable drawn through the opening part 1300 of the top plate 13 is inserted in each electric wire insertion hole 1600 of the terminal block 16 on the rear side. Also, each core wire of the power cable that is electrically connected to the printed wiring board 90 is inserted into each wire insertion hole 1700 of the front terminal block 17.

  In addition, these terminal blocks 16 and 17 are accommodated in the space enclosed by the baseplate 110 of the instrument main body 11, and a pair of side plate 111, for example, are fixed to the baseplate 110 with a screw.

  Thus, according to the present embodiment, the first capacitor C1 is set so that the control circuit (driver IC 40, dimming signal circuit 6 and phase detection circuit 8) can be operated even after the light source 9 cannot be turned on. And the capacity of the second capacitor C2 is set. As a result, when the power is turned off or the power is turned on again, it is possible to reduce a problem that the light source 9 is lit for a moment because the control circuit becomes inoperable before the light source 9.

  Further, it is only necessary to set the capacities of the first capacitor C1 and the second capacitor C2 so that the first time is shorter than the second time, and the cost increase can be suppressed as compared with the case where the above-described discharge path is formed. it can. Furthermore, by providing the lighting device 10 described above, it is possible to provide the lighting fixture 20 that reduces the problem that the light source 9 is lit for a moment when the power is turned off or the power is turned on again, while suppressing an increase in cost.

  In the present embodiment, a flyback converter has been described as an example of the power conversion circuit 4. However, any structure may be used as long as an electrolytic capacitor is connected between the output terminals. For example, a step-down chopper circuit may be used.

  As described above, the lighting device 10 of the present embodiment includes the power conversion circuit 4, the first capacitor C1, the constant current circuit 5, and the control circuit (driver IC 40, dimming signal circuit 6, and phase detection circuit 8). And a second capacitor C2. The power conversion circuit 4 converts an external input voltage into a DC voltage having a desired voltage value. The first capacitor C1 is connected between the output terminals T5 and T6 of the power conversion circuit 4. The constant current circuit 5 is connected in series with the light source 9 between both ends of the first capacitor C1. The control circuit controls the operations of the power conversion circuit 4 and the constant current circuit 5. The second capacitor C2 generates an operation power supply for the control circuit based on an external input voltage. The capacities of the first capacitor C1 and the second capacitor C2 are set so that the first time is shorter than the second time in a state where the supply of the input voltage from the outside is cut off. The first time is a time until the amount of charge stored in the first capacitor C1 becomes equal to or less than the operating power source of the light source 9. The second time is a time until the amount of charge stored in the second capacitor C2 becomes equal to or less than the operating power supply of the control circuit.

  According to the above configuration, the operating power of the control circuit can be ensured until the amount of charge stored in the first capacitor C1 is less than or equal to the operating power of the light source 9, thereby enabling the light source to be turned off when the power is turned off or when the power is turned on again. It is possible to reduce the problem that 9 is lit for a moment. Further, it is only necessary to set the capacities of the first capacitor C1 and the second capacitor C2 so that the first time is shorter than the second time, and the cost increase is suppressed as compared with the case where the above-described discharge path is formed. Can do.

  The lighting fixture 20 of the present invention includes a lighting device 10, a light source 9 that is turned on by power feeding from the lighting device 10, and a fixture body 11 that holds the lighting device 10 and the light source 9.

  According to the said structure, providing the above-mentioned lighting device 10 provides the lighting fixture 20 which reduced the malfunction that the light source 9 lights for a moment at the time of a power supply interruption | blocking or a power-on again, suppressing a cost increase. Can do.

4 Power conversion circuit 5 Constant current circuit 6 Dimming signal circuit (control circuit)
8 Phase detection circuit (control circuit)
9 light source 10 lighting device 11 fixture body 20 lighting fixture 40 driver IC (control circuit)
C1 First capacitor C2 Second capacitor T5, T6 Output terminal

Claims (2)

A power conversion circuit for converting an input voltage from the outside into a DC voltage having a desired voltage value;
A first capacitor connected between output terminals of the power conversion circuit;
A constant current circuit connected in series between both ends of the first capacitor together with a light source;
A control circuit for controlling operations of the power conversion circuit and the constant current circuit;
A second capacitor for generating an operating power supply for the control circuit based on the input voltage,
In a state where the supply of the input voltage is interrupted, the first time until the amount of charge stored in the first capacitor becomes equal to or lower than the operating power supply of the light source is the amount of charge stored in the second capacitor. The lighting device, wherein the capacities of the first capacitor and the second capacitor are set so as to be shorter than a second time until the operating power of the control circuit becomes lower than the operating power.   An illumination fixture comprising: the lighting device according to claim 1; a light source that is turned on by power supply from the lighting device; and a fixture main body that holds the lighting device and the light source.

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