JP5861087B2 - Power supply device, discharge lamp lighting device using the same, LED power supply device, and lighting device - Google Patents

Description

  The present invention relates to a power supply device, a discharge lamp lighting device using the same, an LED power supply device, and a lighting device.

  In the field of power supply devices, it is an important characteristic to reduce power consumption (standby power) in a state where the power supply to the load is stopped and in a standby state. The standby power is power consumed by the control circuit during standby, but a dedicated power supply circuit for supplying power to the control circuit is often omitted for cost reduction. Further, in a power supply device having a communication function, standby power tends to increase.

  The illuminating device shown in Patent Document 1 is an illuminating device having a function of receiving a remote control signal using infrared rays, and discloses a technique for reducing standby power of a control circuit (microcomputer). According to this technology, when the remote control signal is not received, the power supply to the microcomputer is stopped, and when the remote control signal is received, the power supply to the microcomputer is started. Power consumption can be reduced.

Japanese Unexamined Patent Publication No. 11-312591 (paragraph [0006] -paragraph [0013] and FIGS. 1 and 2)

  By the way, when the transmission period of the remote control signal for starting communication is short, the startup time of the microcomputer becomes a problem. In other words, because the microcomputer performs processing to decode the data contained in the received remote control signal, the microcomputer may not be started in time depending on the type of remote control signal, and as a result, the remote control signal cannot be received normally. was there. Therefore, in this case, it is necessary to continue supplying power to the microcomputer during standby, but in order to reduce standby power, a switching power supply circuit must be used, which increases costs.

  The present invention has been made in view of the above problems, and its object is to provide a power supply device that reduces standby power while suppressing an increase in cost, a discharge lamp lighting device, an LED power supply device, and the like. The object is to provide a lighting device.

The power supply device of the present invention includes a first power supply circuit that supplies power received from a power supply to a load and a series circuit of a plurality of resistors, and is connected to the power supply in parallel with the first power supply circuit. At least one detection circuit; an output control circuit for controlling an output of the first power supply circuit based on a detection result of the detection circuit; a second power supply circuit for supplying operating power to the output control circuit; and a second power supply Power that is connected between the input end or output end of the circuit and the output end of the detection circuit, and supplies the input current to the detection circuit as the operation power supply of the output control circuit when the first power supply circuit is stopped by the output control circuit A first detection circuit comprising a series circuit of a plurality of resistors connected between the input terminals of the power supply via a switch element as a detection circuit, and the power supply means includes: Connected between resistors, output control circuit Is in a state of stopping the first power supply circuit, characterized in that it turns off the switch element.

  The power supply apparatus further includes a second detection circuit including a series circuit of a plurality of resistors connected in parallel to the first detection circuit with respect to the power supply as a detection circuit. It is also preferable to supply at least a part of the input current to the detection circuit as an operating power supply for the output control circuit.

  A discharge lamp lighting device according to the present invention includes the power supply device.

  The LED power supply device of the present invention includes the power supply device described above.

  The illuminating device of this invention is equipped with the said power supply device, It is characterized by the above-mentioned.

  There is an effect that it is possible to provide a power supply device, a discharge lamp lighting device, an LED power supply device, and a lighting device that reduce standby power while suppressing an increase in cost.

It is a circuit diagram which shows an example of the illuminating device of this embodiment. It is a time chart for demonstrating operation | movement same as the above. It is another time chart for demonstrating operation | movement same as the above. It is another time chart for demonstrating the operation | movement same as the above.

  Hereinafter, an embodiment of a lighting device will be described with reference to the drawings.

  FIG. 1 is a circuit diagram illustrating an example of a lighting device according to the present embodiment. The lighting device includes a power supply device 14 and a fluorescent lamp (load) 12 that is turned on by lighting power supplied from the power supply device 14.

  The power supply device 14 includes a rectifier circuit 2 that rectifies the AC voltage Vout of the commercial AC power supply (power supply) 1 and a boost chopper circuit that boosts the DC voltage Vblk rectified by the rectifier circuit 2 to a DC voltage Vdc having a desired voltage value. (First power supply circuit) 4 and an inverter circuit 5 for converting the DC voltage Vdc output from the step-up chopper circuit 4 into a high-frequency AC output. The power supply device 14 also includes a microcomputer 8 and a feedback control circuit 13 that control the output of the boost chopper circuit 4, and a power supply voltage detection circuit 3 that detects the power supply voltage by detecting the DC voltage Vblk output from the rectifier circuit 2. And a chopper voltage detection circuit 6 that detects the DC voltage Vdc output from the boost chopper circuit 4 and a no-load detection circuit 7 that detects the presence or absence of the fluorescent lamp 12 and the filament breakage of the fluorescent lamp 12. Further, the power supply device 14 includes a control power supply circuit 10 for supplying the operation power supply Vcc to the feedback control circuit 13 and the inverter circuit 5, and a control power supply circuit (second power supply circuit) 11 for supplying the operation power supply Vdd to the microcomputer 8. Prepare. A smoothing capacitor C1 for lowering the input impedance of the boost chopper circuit 4 is connected between the output terminals of the rectifier circuit 2. The smoothing capacitor C1 has a capacity of about 0.1 μF, for example. Yes.

  The power supply voltage detection circuit 3 has a series circuit of a plurality (three in FIG. 1) of resistors Rd1 to Rd3, and divides the DC voltage Vblk rectified by the rectifier circuit 2 into a voltage suitable for monitoring by the microcomputer 8. Press. In this example, the voltage at the connection point between the resistor Rd2 and the resistor Rd3, that is, the voltage Vm1 across the resistor Rd3 is input to the microcomputer 8, and the microcomputer 8 detects the change from the both ends voltage Vm1 to ON to OFF of the input power supply. Then, various data relating to the operation up to that point are stored in the internal memory. Here, the current flowing through the power supply voltage detection circuit 3 is designed to be about 100 μA on average. Further, when the AC voltage Vout of the commercial AC power supply 1 is designed to operate at AC 100V to 200V, it is necessary to design so that a sufficient current flows even at the AC voltage Vout = 100V. In the present embodiment, the power supply voltage detection circuit 3 constitutes a second detection circuit.

  The step-up chopper circuit 4 includes a transformer Tr1, a switching element Q1, a diode D1, an electrolytic capacitor C2, and a feedback control circuit 13. The step-up chopper circuit 4 boosts the DC voltage Vblk output from the rectifier circuit 2 to a DC voltage Vdc having a desired voltage value. Then, it is supplied to the inverter circuit 5 in the subsequent stage. The feedback control circuit 13 performs ON / OFF control of the switching element Q1 at a high frequency, and performs feedback control so that the voltage Vdc across the electrolytic capacitor C2 has a predetermined voltage value. Further, the feedback control circuit 13 starts or stops the chopper operation according to the control signal EN2 output from the microcomputer 8.

  The chopper voltage detection circuit 6 includes a series circuit of a plurality (two in FIG. 1) of resistors Rd4 and Rd5 and a switch element Q2 connected in series to the series circuit, and the boost chopper circuit 4 operates. In the meantime, the switch element Q2 is turned on by the control signal SC1 output from the microcomputer 8, and the voltage at the connection point between the resistors Rd4 and Rd5, that is, the voltage Vfb1 across the resistor Rd5 is input to the feedback control circuit 13. Further, while the boost chopper circuit 4 and the inverter circuit 5 are stopped by the control signal EN2 output from the microcomputer 8, the switch element Q2 is turned OFF by the control signal SC1. Here, the resistance values of the resistors Rd4 and Rd5 are set so that the current flowing through the chopper voltage detection circuit 6 becomes about 100 μA during the operation of the boost chopper circuit 4, which is the input current to the feedback control circuit 13. This is because the value is sufficiently larger than (about 1 μA).

  Here, the feedback control circuit 13 controls the on-time of the switching element Q1 so that the both-ends voltage Vfb1 of the resistor Rd5 input from the chopper voltage detection circuit 6 matches a predetermined reference voltage Vref1. The reference voltage Vref1 is set to 2.5V, for example.

  The no-load detection circuit 7 is composed of a series circuit of a plurality (four in FIG. 1) of resistors Rd6 to Rd9 and the above-described switch element Q2 connected in series to this series circuit. By detecting the presence / absence, the presence / absence of the fluorescent lamp 12 and the filament breakage of the fluorescent lamp 12 are detected. For example, when the filament is disconnected, no current flows through the resistor Rd9. Therefore, the voltage at the connection point between the resistor Rd8 and the resistor Rd9, that is, the voltage Vk2 across the resistor Rd9 is 0V. When the microcomputer 8 detects that the voltage Vk2 between both ends has become 0V, the microcomputer 8 performs output control such as stopping the inverter circuit 5. Here, the resistance values of the resistors Rd6 to Rd9 are set so that the current flowing through the no-load detection circuit 7 is about 100 μA. In the present embodiment, the chopper voltage detection circuit 6 and the no-load detection circuit 7 constitute a first detection circuit.

  The control power supply circuit 10 receives the DC voltage Vdc output from the boost chopper circuit 4 and generates an operation power supply Vcc for the feedback control circuit 13 and the inverter circuit 5. The control power supply circuit 10 is activated or stopped in response to the control signal EN1 output from the microcomputer 8. Here, while the step-up chopper circuit 4 is operating, the operation power supply Vcc is supplied from the auxiliary power supply circuit composed of the secondary winding W2 of the transformer Tr1, the resistor R2, the diode D2, and the capacitor C3. The power supply circuit 10 is stopped.

  The control power supply circuit 11 is composed of, for example, a series regulator, and the operation power supply Vcc generated by the control power supply circuit 10 or the auxiliary power supply circuit is input to generate the operation power supply Vdd of the microcomputer 8. The operating power supply Vcc is higher than the operating power supply Vdd, for example, 10V to 15V, and the operating power supply Vdd is, for example, 2.8V to 5.0V.

  The inverter circuit 5 is, for example, a half-bridge type inverter circuit, converts the DC voltage Vdc input from the boost chopper circuit 4 into a high-frequency AC output, and supplies the high-frequency AC output to the fluorescent lamp 12 via the DC cut capacitor Cd3. The inverter circuit 5 starts or stops oscillation according to the control signal EN2 output from the microcomputer 8.

  The microcomputer 8 outputs a control signal EN2 to the feedback control circuit 13 and the inverter circuit 5, and starts or stops both the circuits 5 and 13. Further, the microcomputer 8 outputs a control signal EN1 to the control power supply circuit 10 to start or stop the control power supply circuit 10. Further, the microcomputer 8 monitors the voltage value of the DC voltage Vblk by the voltage Vm1 across the resistor Rd3 input from the power supply voltage detection circuit 3, and the fluorescence by the voltage Vk2 across the resistor Rd9 input from the no-load detection circuit 7. The presence or absence of the lamp 12 and the filament breakage are detected. Further, the microcomputer 8 controls ON / OFF of the switch element Q2 by the control signal SC1, and performs control for reducing power loss during standby. That is, the switch element Q2 is turned off while the boost chopper circuit 4 and the inverter circuit 5 are stopped, and the switch element Q2 is turned on while the boost chopper circuit 4 and the inverter circuit 5 are activated. Here, in this embodiment, the feedback control circuit 13 and the microcomputer 8 constitute an output control circuit.

  Here, 9 is a communication interface circuit, and a setting signal from the outside is input to the communication interface circuit 9. The setting signals include lighting / extinguishing signals, dimming level signals, address setting signals, and the like. Various setting signals received by the communication interface circuit 9 are transmitted to the microcomputer 8, and the microcomputer 8 boosts based on these setting signals. The operation of the chopper circuit 4 and the inverter circuit 5 is controlled.

  Here, a diode D4 is connected between the connection point of the resistors Rd1 and Rd2 of the power supply voltage detection circuit 3 and the output terminal (the power supply input terminal Vdd of the microcomputer 8) of the control power supply circuit 11, and the resistor Rd1. When the voltage at the connection point of the resistor Rd2 is higher than the operating power supply Vdd, a part of the current flowing through the resistor Rd1 is supplied as the operating power supply for the microcomputer 8.

  A diode D3 is connected between the connection point of the resistors Rd4 and Rd5 of the chopper voltage detection circuit 6 and the output terminal of the control power supply circuit 11 (power supply input terminal Vdd of the microcomputer 8). When the switch element Q2 is turned OFF by the control signal SC1 and the voltage Vfb1 across the resistor Rd5 is higher than the operating power supply Vdd, the current flowing through the resistor Rd4 is supplied as the operating power supply for the microcomputer 8. Furthermore, a diode D5 is connected between the connection point of the resistors Rd7 and Rd8 of the no-load detection circuit 7 and the output terminal of the control power supply circuit 11 (the power supply input terminal Vdd of the microcomputer 8). When the switch element Q2 is turned OFF by the control signal SC1 and the voltage at the connection point between the resistors Rd8 and Rd9 is higher than the operating power supply Vdd, the current flowing through the resistors Rd6 and Rd7 is supplied as the operating power supply for the microcomputer 8. .

  That is, in the state where the boost chopper circuit 4 and the inverter circuit 5 are stopped (standby state), the operation power supply Vcc is not output from the auxiliary power supply circuit and the control power supply circuit 10, and thus the microcomputer 8 is stopped as it is. However, as described above, by supplying a part of the current flowing through the resistor Rd1, the current flowing through the resistor Rd4, and the current flowing through the resistor Rd6 as the operating power supply of the microcomputer 8, the control power supply circuit 10 is activated in the standby state. Since the microcomputer 8 can be continuously started and the control power supply circuit 10 does not have to be started, standby power can be reduced. Here, in this embodiment, the power supply means is comprised by the diodes D3-D5.

Next, FIG. 2 is a time chart for explaining the operation of the power supply device 14. Before time t1, since the control signal EN2 output from the microcomputer 8 is Low, the boost chopper circuit 4 and the inverter circuit 5 operate stably, and the fluorescent lamp 12 is in a lit state. At this time, since the control signal EN1 is Low, the control power supply circuit 10 does not generate the operation power supply Vcc, and the operation power supply Vcc is generated by the auxiliary power supply circuit. At this time, since the control signal SC1 is High, the switch element Q2 is ON, and the feedback control circuit 13 receives the voltage Vfb1 across the resistor Rd5. Here, the both-end voltage Vfb1 is
Vfb1 = Vdc × Rd5 / (Rd4 + Rd5)
Is required. Further, when the boost chopper circuit 4 is in a steady state, the both-end voltage Vfb1 is controlled to be substantially equal to the reference voltage Vref1.

  When a control signal for shifting to the extinguishing standby mode is input from the outside at time t1, the microcomputer 8 sets the control signal EN2 to High to stop the operation of the feedback control circuit 13 and the inverter circuit 5. . When the boost chopper circuit 4 is stopped by the feedback control circuit 13, the supply of the operating power Vcc from the auxiliary power supply circuit is stopped, so the feedback control circuit 13 is also stopped. At this time, the voltage Vdc across the electrolytic capacitor C2 also decreases and stabilizes near the peak value of the commercial AC power supply 1.

  Further, when the control signal SC1 is switched to Low at time t2 when several hundred μs have elapsed from time t1, the switch element Q2 is turned off, and the operations of the chopper voltage detection circuit 6 and the no-load detection circuit 7 are stopped.

  Furthermore, when the voltage Vfb1 of the resistor Rd5 becomes Vdd + 0.4 (V) at the time t3, the voltage is limited by the voltage Vfb1 = Vdd + 0.4 (V), and at the same time, the diode D3 has a forward current (bias current). I1 flows and is supplied to the microcomputer 8 as an operating power source. At this time, since the voltage at the connection point between the resistors Rd7 and Rd8 also exceeds Vdd + 0.4 (V), a forward current (bias current) also flows through the diode D5. The above 0.4V is the forward voltage of the diodes D3 and D5, and this forward voltage is actually about 0.3V to 0.4V.

  Next, during the period from time t3 to time t4, the forward current I1 of the diode D3 continuously flows, and the forward current of the diode D5 also flows continuously. That is, the forward current I1 of the diode D3 and the forward current of the diode D5 are supplied to the power input terminal Vdd of the microcomputer 8, and a total current of about 200 μA is supplied.

  Further, when a control signal for shifting to the lighting mode is input from the outside at time t4, the microcomputer 8 sets the control signal SC1 to High and the switch element Q2 to ON, and sets the control signal EN1 to High. The control power supply circuit 10 is activated to generate the operation power supply Vcc for the feedback control circuit 13 and the inverter circuit 5. At this time, the chopper voltage detection circuit 6 and the no-load detection circuit 7 start to operate when the switch element Q2 is turned on, but several hundreds of μs is sufficient for the detection signals of both the detection circuits 6 and 7 to become stable. It is. That is, at time t5, the detection signals of both detection circuits 6 and 7 are stable.

  After the time t5 when the operating power supply Vcc and the detection signals Vfb1 and Vk2 are sufficiently stabilized, the microcomputer 8 sets the control signal EN2 to Low to activate the feedback control circuit 13 and the inverter circuit 5. At time t6 when the step-up chopper circuit 4 is activated, the operating power supply Vcc is supplied from the auxiliary power circuit (a power circuit composed of the secondary winding W2, resistor R2, diode D2, and capacitor C3). The microcomputer 8 turns off the control signal EN1 and stops the control power supply circuit 10. As a result, during the operation of the step-up chopper circuit 4, power consumption can be suppressed by the amount of power consumed by the control power supply circuit 10.

  Next, FIG. 3 shows the time change of the forward current I2 of the diode D4 when the fluorescent lamp 12 is turned on. Vblk in FIG. 3 is a DC voltage output from the rectifier circuit 2 and represents a voltage waveform obtained by full-wave rectifying the AC voltage Vout of the commercial AC power supply 1. In FIG. 3, the AC voltage Vout of the commercial AC power supply 1 is 0 V at time t2 and time t5. Also, Vm1 in FIG. 3 is the voltage at the connection point of the resistors Rd2 and Rd3, that is, the voltage across the resistor Rd3. The voltage Vm1 across the resistor Rd3 is input to the microcomputer 8. The microcomputer 8 detects that the both-ends voltage Vm1 has become Low for a predetermined time or more, thereby detecting that the input power supply has been turned off, and stores various data relating to the operation so far in the internal memory. Note that the above-described voltage Vm1 is limited by a predetermined voltage level V1 as shown in FIG.

  Here, during the period from time t3 to time t4 when the voltage at the connection point between the resistor Rd1 and the resistor Rd2 becomes equal to or higher than the operating power supply Vdd + 0.4 (V) of the microcomputer 8, the diode D4 is turned on, and the forward current (bias current). I2 flows. For this reason, the voltage Vm1 across the resistor Rd3 is limited to a predetermined voltage level V1 as shown in FIG. The forward current I2 is supplied to the microcomputer 8 as an operating power source.

  FIG. 4 shows the time change of the forward current I2 of the diode D4 when the fluorescent lamp 12 is turned off. In FIG. 4, Vblk indicates a DC voltage output from the rectifier circuit 2, and Vm1 indicates a voltage across the resistor Rd3. Here, as compared with FIG. 3 described above, it can be seen that the valley portion (the portion where the voltage is the lowest) of the DC voltage Vblk output from the rectifier circuit 2 is increased as a whole. This is because when the step-up chopper circuit 4 is stopped, the discharge amount of the capacitor C1 connected between the output terminals of the rectifier circuit 2 is reduced. Further, the voltage Vm1 across the resistor Rd3 has a shorter time T2 that is not limited to the predetermined voltage level V1 (T2 <T1) and a longer period during which the forward current I2 flows in the diode D4 as compared with FIG. As a result, the forward current I2 supplied to the microcomputer 8 increases, and a large amount of power supply current for the microcomputer 8 can be secured.

  Here, the current consumption during the operation of the microcomputer 8 is about 5 mA. For example, when the AC voltage Vout of the commercial AC power supply 1 is 240 V, the standby power is 1 when trying to secure a current of 5 mA by the series regulator during standby. .2W is required. Moreover, it is possible to reduce the current consumption to 2 mA by reducing the number of clocks of the microcomputer 8 during standby. At this time, standby power can be reduced to 0.48 W, but it is necessary to further reduce from the viewpoint of energy saving. It is. Furthermore, there is a microcomputer that can reduce the current consumption to 10 μA by stopping the clock, but in order to ensure communication performance, it is necessary to maintain a standby state while performing a certain amount of processing.

  On the other hand, in this embodiment, a bias current of about 100 μA is set for each of the resistor Rd1 constituting the power supply voltage detection circuit 3, the resistor Rd4 constituting the chopper voltage detection circuit 6, and the resistor Rd6 constituting the no-load detection circuit 7. Therefore, as a whole, standby power of about 0.3 mA can be secured, and as a result, standby power of about 0.1 W can be reduced.

  Further, when the boost chopper circuit 4 is made to correspond to the AC voltage Vout = 100V to 240V of the commercial AC power supply 1, the bias current of each of the detection circuits 3, 6, and 7 tends to increase, and the above effect is Further enhanced. For example, if the bias current flowing through the resistor Rd1 of the power supply voltage detection circuit 3 is set to 100 μA when the AC voltage Vout = 100V, a bias current of 240 μA flows when the AC voltage Vout = 240V. Therefore, even when the AC voltage Vout of the commercial AC power supply 1 increases due to the bias current, it is possible to suppress an increase in standby power.

  Furthermore, since the bias currents of the detection circuits 3, 6, and 7 are used as standby power for the microcomputer 8 as described above, an increase in cost can be suppressed as compared with the case where a switching power supply circuit is used. Further, when the switch element of the chopper voltage detection circuit 6 and the switch element of the no-load detection circuit 7 are shared by the switch element Q2 as in this embodiment, the cost increase can be further suppressed.

  In the present embodiment, the chopper voltage detection circuit 6 and the no-load detection circuit 7 share the switch element Q2, but the switch elements may be provided individually. In this embodiment, the input power supply of the control power supply circuit 10 is taken from the output end of the boost chopper circuit 4, but it may be configured to take it from the output end of the rectifier circuit 2. Further, the microcomputer 8 may be provided with a function of monitoring its own operating power supply Vdd. When the voltage drop of the operating power supply Vdd is detected using this monitoring function, the control power supply circuit 10 is activated by the control signal EN1. As a result, the operation power supply Vdd can be supplied from the control power supply circuit 11, and as a result, the operation power supply Vdd can be maintained.

  Further, in the present embodiment, the discharge lamp lighting device including the power supply device 14 has been described as an example. However, for example, an LED power supply device using an LED as a load may be used, and the standby power is similarly reduced while suppressing an increase in cost. can do. Further, a circuit for generating a bias current for use in standby power is not limited to the present embodiment. For example, when performing phase dimming (triac dimming), dimming level detection and triac holding are performed. A bias current circuit for current may be used.

  Further, in the present embodiment, the case of shifting to the standby state according to the control signal from the outside has been described as an example. For example, the no-load detection circuit 7 detects an abnormality (filament breakage) of the fluorescent lamp 12 and boosts the voltage. Even when the chopper circuit 4 and the inverter circuit 5 are stopped, the power consumption can be reduced by performing the same control. Furthermore, in the present embodiment, the case where the input power source is alternating current has been described as an example, but it may be direct current. In the present embodiment, the bias current of each of the detection circuits 3, 6, and 7 is supplied to the output terminal of the control power circuit 11. However, the supply destination may be the input terminal of the control power circuit 11. In addition, standby power can be reduced while suppressing an increase in cost.

  Further, in the present embodiment, the case where both the first detection circuit (the chopper voltage detection circuit 6 and the no-load detection circuit 7) and the second detection circuit (the power supply voltage detection circuit 3) are provided has been described as an example. Only the first detection circuit or only the second detection circuit may be used. In the present embodiment, the case where the first power supply circuit is the step-up chopper circuit 4 has been described as an example. However, for example, a step-down chopper circuit or a step-up / step-down chopper circuit may be used.

4 Boost chopper circuit (first power supply circuit)
6 Chopper voltage detection circuit (first detection circuit)
8 Microcomputer (Output control circuit)
11 Control power circuit (second power circuit)
12 Fluorescent lamp (load)
13 Feedback control circuit (output control circuit)
14 Power supply device D3 Diode (power supply means)
Rd4, Rd5 resistance

Claims (5)

A first power supply circuit for supplying power received from a power supply to a load;
A series circuit of a plurality of resistors, at least one detection circuit connected in parallel to the first power supply circuit with respect to the power supply;
An output control circuit for controlling an output of the first power supply circuit based on a detection result of the detection circuit;
A second power supply circuit for supplying operating power to the output control circuit;
Connected between the input terminal or output terminal of the second power supply circuit and the output terminal of the detection circuit, and when the first power supply circuit is stopped by the output control circuit, the input current to the detection circuit is Power supply means for supplying as an operation power source of the output control circuit ,
A first detection circuit comprising a series circuit of a plurality of resistors connected between input terminals of the power supply via a switch element as the detection circuit;
The power supply means is connected between the resistors of the first detection circuit,
The power supply apparatus according to claim 1, wherein the output control circuit turns off the switch element when the first power supply circuit is stopped . A second detection circuit comprising a series circuit of a plurality of resistors connected in parallel to the first detection circuit with respect to the power supply, as the detection circuit;
The power supply apparatus according to claim 1, wherein the power supply means supplies at least a part of an input current to the second detection circuit as an operation power supply of the output control circuit. A discharge lamp lighting device comprising the power supply device according to claim 1. An LED power supply device comprising the power supply device according to claim 1. An illumination device comprising the power supply device according to claim 1.

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