JP2005057947A - Power supply device and discharge lamp lighting device - Google Patents

Abstract

A power supply device and a discharge lamp lighting device that suppress inrush current, suppress power loss on a circuit as much as possible, reduce power consumption, and improve the degree of freedom when circuit elements are mounted on a substrate.
A DC power source 2 obtained by full-wave rectification of an AC power source 1, a boost chopper circuit 4 that includes an inductor L1 having a secondary winding L12 and boosts the voltage of the DC power source 2, a DC power source 2 and a booster The current limiting means R1 connected between the chopper circuit 4, the switch means Q1 connected in parallel to the current limiting means R1, and the secondary winding L12 are connected to the secondary winding L12 to drive the switching means Q1. It is set as the structure equipped with the inrush current suppression apparatus which comprises the voltage rectification means 3. FIG.
[Selection] Figure 1

Description

 The present invention relates to a power supply device and a discharge lamp lighting device having a function of suppressing an inrush current when power is turned on in a discharge lamp lighting device or the like.

  A conventional discharge lamp lighting device of this type has a switching power supply circuit and an inverter circuit, and an inrush current having a large peak flows in order to rapidly charge a smoothing capacitor included in these circuits when the power is turned on.

  When this inrush current flows in the circuit, various circuit elements constituting the circuit may be stressed or a mechanical switch of the power supply unit may be welded due to a large current.

  In order to prevent this, conventionally, as shown in FIG. 7, a resistor R41, which is a current limiting element, is connected to the output of the diode bridge 42 for full-wave rectification of the commercial power supply 41 and the path of the step-up chopper circuit 43. The smoothing capacitor C41 is initially charged via the resistor R41 at the time of turning on, so that the inrush current does not flow to the smoothing capacitor C41 in the circuit, and the switch element Q41 connected in parallel to the current limiting element R41 after a certain time elapses. The resistor R41 is turned on to supply a predetermined direct current to the smoothing capacitor C41.

  As the switch element Q41, a semiconductor switch such as SCR is generally used, and a signal for driving the switch element Q41 is supplied from the output voltage of the boost chopper circuit 43 in the circuit to the gate of the SCR via the resistors R42 and R43. To be done.

For this reason, during operation of the circuit, it is necessary to keep the SCR, which is the switching element Q1, in the on state, short-circuit the resistor R41, and continue to supply current to the resistors R42 and R43. There is a problem that power is consumed, and power consumed during circuit operation increases.
JP, 7-147770, A As a technique for solving this, there is a technique shown in FIG. 1 and FIG. 2 of the above-mentioned patent document 1. The switching element Q1 is turned on with an output obtained by smoothing and half-wave rectifying the voltage induced in the secondary winding L12 wound in the same polarity as the primary winding L11 with the diode D2 and the capacitor C2, and the current limiting element Z By short-circuiting both ends, power loss due to the current-limiting element Z after the inrush current has finished flowing is prevented.

  Compared with the method shown in the conventional example of FIG. 7 described above, this method does not have a resistor for supplying a drive current to the switch element, so that the power consumption in the drive circuit of the switch element is suppressed during operation. Will be.

  However, in the configuration of Patent Document 1, as shown in FIG. 2 of Patent Document 1, the secondary winding L12 has a polarity opposite to the pulsating current output of the diode bridge DB, that is, the voltage decreases at the peak of the pulsating current. In the valley portion, the voltage increases (FIG. 2 (f)). When this induced voltage is rectified and smoothed by the diode D2 and the capacitor C2, a waveform having a high ripple at the valley of the power supply voltage and a low ripple at the peak as shown in FIG. Since the DC voltage having the ripple is supplied to the switching element Q1, the timing at which the drive signal is given to the switching element Q1 is only the valley of the power supply voltage.

  On the other hand, in this type of device, when the boost chopper circuit 1 is configured to have a constant output voltage control in order to stably control the load, the power supply voltage suddenly changes for some reason or the power supply voltage is distorted. In order to prevent the output voltage from increasing when a high voltage is applied, the oscillation of the circuit is stopped or intermittently oscillated.

  At this time, the drive signal of the switching element Q1 is lowered and the switching element Q1 is turned off. Since the drive signal cannot be supplied to the valley of the power supply voltage, a current is supplied to the current limiting element Z for suppressing the inrush current. If this is repeated, the current limiting element Z may generate heat or cause abnormal oscillation.

  The technique disclosed in Patent Document 1 is an essential requirement to designate the primary winding L11 and the secondary winding L12 provided in the inductor L1 of the boost chopper circuit 1 as the same polarity. There is also a problem that restrictions occur when mounting the board.

  Furthermore, harmonics and the like are generated due to abnormal oscillation, which also causes noise.

  Moreover, since resistance as a current limiting element is still necessary, the cost is high.

  The present invention aims to solve the above-described problems, and suppresses inrush current, suppresses power loss on the circuit as much as possible to reduce power consumption, and improves the degree of freedom when mounting circuit elements on the board. The power supply device and the discharge lamp lighting device are provided.

  The invention of the power supply device according to claim 1 is a DC power supply obtained by full-wave rectification of an AC power supply; a step-up chopper circuit that includes an inductor having a secondary winding and boosts the voltage of the DC power supply; Current limiting means connected between the step-up chopper circuit, switch means connected in parallel to the current limiting means, and voltage doubler rectifying means connected to the secondary winding and driving the switch means And an inrush current suppressing device.

  The “boost chopper circuit that boosts the voltage of a DC power supply with an inductor having a secondary winding” according to the present invention means a boost chopper circuit having an inductor that boosts the voltage of the DC power supply and stores energy for boosting operation. The inductor may have a secondary winding for connecting a voltage doubler rectifier described later, and the secondary winding may be divided into a plurality of boosting inductors and provided in a part thereof. In short, it has at least a voltage boosting function for the DC power supply and a function for connecting the voltage doubler rectifying means. A voltage is induced from the voltage boosting chopper circuit, and this voltage is supplied to the voltage doubler rectifying means. It only has to be.

  The “current limiting means connected between the DC power supply and the boost chopper circuit” is preferably a resistor having a predetermined resistance value, but is connected between the DC power supply and the boost chopper circuit, and an inrush current when the power is turned on. As long as it has a predetermined impedance to prevent or limit the current and prevent it from flowing, it may be a thermistor having a positive or negative characteristic.

  The “switching means connected in parallel to the current limiting means” is preferably a semiconductor element such as an SCR, FET, thyristor, or transistor, but may of course be a mechanical switching element such as a relay and is driven by a voltage doubler rectifying means described later. It is only necessary to have a drive gate means for making the current limiting means short-circuited when driven.

  The voltage doubler rectifier that is connected to the secondary winding and drives the switch means is preferably a voltage doubler rectifier composed of a diode of opposite polarity and two capacitors. However, the present invention is not limited to this, and design changes to various circuit configurations are permitted.

  The voltage doubler rectifying means is connected to the secondary winding of the inductor in the boost chopper circuit and drives the switch means by its output. The voltage for driving the switch means is the power supply voltage. What is necessary is just to have a function which always becomes a fixed output voltage, even if there exists a fluctuation | variation etc.

  The power supply device of the present invention is a power supply device suitable as a power supply for the discharge lamp lighting device, but is not limited thereto.

  According to the present invention, inrush current can be suppressed by the current limiting means, and the voltage for driving the switch means is always a constant output voltage even if the power supply voltage fluctuates, etc., and the switch means operates reliably. It is possible to prevent the current limiting means from generating heat, and it is possible to reduce power consumption by suppressing power loss on the circuit as much as possible.

  In addition, it is possible to provide a power supply apparatus including an inrush current suppressing device having various advantages such as no restrictions on circuit board mounting of circuit elements and improved design freedom.

  A discharge lamp lighting device according to a second aspect includes the power supply device according to the first aspect; an inverter connected to the power supply device; and a discharge lamp energized by the inverter.

  The discharge lamp lighting device of the present invention can be applied to various discharge lamp lighting devices such as fluorescent lamps used for business lighting such as home or building facilities.

  The power supply device according to claim 3 is a DC power supply obtained by full-wave rectification of an AC power supply; switch means connected between the DC power supply and the smoothing capacitor; and a drive power supply connected in parallel to the switch means And an inrush current suppressing device having a drive determination circuit and a trigger circuit that drives the switch means when the power supply voltage becomes equal to or lower than a predetermined voltage.

  The “switch means connected between the DC power supply and the smoothing capacitor” of the present invention is preferably a semiconductor element such as an SCR, FET, thyristor, transistor, etc., but may be a mechanical switch element such as a relay, as will be described later. It only needs to have drive gate means for being driven by the circuit and to have a function of bringing the circuit into a conductive state when driven.

The smoothing capacitor is not limited to the one directly connected to the switch means, but also includes a smoothing capacitor charged via an inductor such as a boost chopper circuit. In short, the switch means is between the DC power source and the smoothing capacitor. The trigger circuit that is connected in parallel to the switch means and has a drive power supply and a drive determination circuit, and drives the switch means when the power supply voltage falls below a predetermined voltage. Means that the trigger circuit has a drive power source and a drive discrimination circuit, the drive power source means a power source for driving the drive discrimination circuit, and whether the drive discrimination circuit drives the switch means or not It is preferable that the circuit has a constant voltage element that acts to drive the switch means when the power supply voltage is equal to or lower than a predetermined voltage. Good.

  The power supply device of the present invention is a power supply device suitable as a power supply for the discharge lamp lighting device, but is not limited thereto.

  According to the present invention, since the switch means is driven when the power supply voltage is equal to or lower than the predetermined voltage, a zero-cross switch is possible, and the inrush current can be reliably suppressed at low cost.

  Furthermore, since the trigger circuit can be short-circuited by the switch means during operation, power loss on the circuit can be suppressed as much as possible to reduce power consumption.

  In addition, there is no restriction when the circuit element is mounted on the substrate, and the degree of freedom in design is improved. Furthermore, since there is no resistance or the like as a current limiting means, it is possible to provide a power supply device including an inrush current suppressing device having various advantages such as cost reduction.

  According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device comprising: the power source device according to the third aspect; an inverter connected to the power source device; and a discharge lamp energized by the inverter.

  The discharge lamp lighting device of the present invention can be applied to various discharge lamp lighting devices such as fluorescent lamps used for business lighting such as home or building facilities.

  According to the first aspect of the present invention, the inrush current can be suppressed by the current limiting means, and the voltage for driving the switch means is always a constant output voltage even if the power supply voltage fluctuates. It can be reliably operated, the current-limiting means is prevented from generating heat, the power loss on the circuit is suppressed as much as possible, and the power consumption can be reduced.

  In addition, it is possible to provide a power supply apparatus including an inrush current suppressing device having various advantages such as no restrictions on circuit board mounting of circuit elements and improved design freedom.

According to the invention of claim 2,
The current limiting means can suppress the inrush current, and the voltage for driving the switch means is always a constant output voltage even if the power supply voltage fluctuates, etc., and the switch means can be operated reliably. It is possible to prevent the flow means from generating heat and suppress power loss on the circuit as much as possible to reduce power consumption.

  In addition, it is possible to provide a discharge lamp lighting device having a power supply device provided with an inrush current suppressing device having various advantages such as no restrictions on circuit board mounting of circuit elements and improved design freedom.

According to the invention of claim 3,
Since the switch means is driven when the power supply voltage is equal to or lower than the predetermined voltage, a zero-cross switch is possible, and the inrush current can be suppressed reliably and inexpensively.

  Furthermore, since the trigger circuit can be short-circuited by the switch means during operation, power loss on the circuit can be suppressed as much as possible to reduce power consumption.

  In addition, there is no restriction when the circuit element is mounted on the substrate, and the degree of freedom in design is improved.

  Furthermore, since there is no resistance or the like as a current limiting means, it is possible to provide a power supply device including an inrush current suppressing device having various advantages such as cost reduction.

According to the invention of claim 4,
Since the switch means is driven when the power supply voltage is equal to or lower than the predetermined voltage, a zero-cross switch is possible, and the inrush current can be suppressed reliably and inexpensively.

Furthermore, since the trigger circuit can be short-circuited by the switch means during operation, power loss on the circuit can be suppressed as much as possible to reduce power consumption.
In addition, there are no restrictions when the circuit elements are mounted on the substrate, and the degree of freedom in design is improved.
Furthermore, since there is no resistance or the like as a current limiting means, it is possible to provide a discharge lamp lighting device having a power supply device equipped with an inrush current suppressing device having various advantages such as cost reduction. .

  Hereinafter, a first embodiment of a power supply device and a discharge lamp lighting device according to the present invention will be described.

  1 to 2 show a first embodiment of the present invention, FIG. 1 is a circuit configuration diagram showing a basic configuration, and FIG. 2 is an operation explanatory diagram showing an operation state.

  In FIG. 1, 1 is a commercial power source which is an AC power source, 2 is a diode bridge for full-wave rectification of the commercial power source, R1 is a resistor which is a current limiting means, Q1 is a switching means composed of SCR, and 3 is a voltage doubler rectifying means. 4 is a step-up chopper circuit, 5 is a discharge lamp lighting device comprising a half-bridge type inverter, etc., and includes a discharge lamp as a load.

  The resistor R1, the switch means Q1, and the voltage doubler rectifier circuit 3 constitute an inrush current suppressing device.

  The step-up chopper circuit 4 includes an inductor L1, a switching element S1 composed of an FET, a diode D1, and a smoothing capacitor C1, and a switching means Q1 is connected in series with the inductor L1 between the inductor L1 and the output terminal of the diode bridge 2. A resistor R1 is connected in parallel with the switch means Q1.

  The inductor L1 has a secondary winding L12 wound with the inductor as a primary winding L11, and the voltage doubler rectifier circuit 3 is connected to the secondary winding L12.

  In the voltage doubler rectifier circuit 3, a diode C2 is connected in parallel to a series circuit of a capacitor C2, a capacitor C2, and a secondary winding L12 connected in series to the secondary winding L12, and one end of the diode D2 is connected to the primary winding. It is connected to the common end of the line L11 and the secondary winding L12.

  Furthermore, a diode D3 having a polarity opposite to that of the diode D2 is connected in series to the diode D2, a capacitor C3 is connected in parallel to the series circuit of the diode D2 and the diode D3, and a series circuit of resistors R2 and R3 is connected in parallel to the capacitor C3. Further, an intermediate point between the resistors R2 and R3 is connected to the gate terminal of the SCR of the switch means Q1, so that the voltage doubler rectifier circuit 3 is configured.

  Next, the operation of the above embodiment will be described.

  FIG. 2 is an operation explanatory diagram showing an operation state.

  When the commercial power source 1 is turned on, the alternating current is full-wave rectified by the diode bridge 2, and the smoothing capacitor C1 of the boost chopper circuit 4 is initially charged via the resistor R1 that is a current limiting element.

  At this time, since the resistor R1, which is a current limiting element, is present in the path for supplying the output of the diode bridge 2 to the step-up chopper circuit 4, the inrush current generated when the power is turned on is suppressed from flowing in the circuit.

  Further, when the boost chopper circuit 4 is activated and a certain time has elapsed since the power is turned on, a secondary voltage is induced in the secondary winding L12 of the inductor L1 of the boost chopper circuit 4, and the voltage is smoothed by the voltage doubler rectifier circuit 3. A signal voltage is supplied from the smoothed voltage source to the gate terminal of the SCR of the switch means Q1 to turn on the SCR.

  When the SCR is turned on, the resistor R1, which is a current limiting means, is short-circuited, and a predetermined direct current is supplied to the step-up chopper circuit 4 via the SCR to control the discharge lamp lighting device 5.

  Therefore, after the inrush current is generated, the resistor R1 is short-circuited by the SCR of the switch means Q1, so that power loss due to the resistor R1 does not occur.

  In the above operation, voltage waveforms generated on the circuit will be described. The full-wave rectified waveform shown in FIG. 2A is generated at the output terminal of the diode bridge 2 (arrow a in FIG. 1). The voltage across the primary winding L11 of the reactor L1 is shown in FIG. 2B (arrow b in FIG. 1), and the voltage induced in the secondary winding L12 of the reactor 8 is opposite to the voltage across the primary winding L11. The characteristic waveform of FIG. 2C is generated (arrow c in FIG. 1).

  Furthermore, the capacitor C3 of the voltage doubler rectifier circuit 3 generates FIG. 2 (d), which is a constant voltage regardless of the power supply phase, due to the voltage doubler action of the voltage doubler rectifier circuit 3 (arrow d in FIG. 1). This constant voltage is supplied to the gate of the SCR which is the switch means Q1.

  At this time, conventionally, as shown in FIG. 2 of Patent Document 1, a direct current voltage having a high ripple at the valley of the power supply voltage and a low ripple at the peak is supplied to the switching element Q1. The timing at which the drive signal is given is only at the valley of the power supply voltage. When the boost chopper 1 is configured to control the output voltage to be constant, the power supply voltage suddenly changes for some reason or the power supply voltage is distorted and high. In order to prevent the output voltage from increasing when a voltage is applied, when the circuit oscillation is stopped or intermittently oscillated, the drive signal of the switching element Q1 is lowered and the switching element Q1 is turned off. Since the drive signal cannot be supplied to the part, current flows through the current limiting element Z for suppressing inrush current during this period, and this is repeated to generate the current limiting element Z. Or, there is a possibility that or cause an abnormal oscillation.

  However, in the present embodiment, as described above, the SCR, which is the switch means Q1, is supplied with a constant voltage without ripples due to the voltage doubler action of the voltage doubler rectifier circuit 3, so that power supply distortion occurs. Even if the step-up chopper circuit oscillates intermittently, the switching means Q1 SCR is turned off and no current flows through the resistor R1, and the resistor R1 generates heat or causes abnormal oscillation. There is no.

  Moreover, since the same effect is obtained even if the polarity of the primary winding L11 and the secondary winding L12 of the reactor L1 in this embodiment is the same polarity or reverse polarity, it is shown in the conventional patent document 1. In addition, it is not necessary to designate the primary winding L11 and the secondary winding L12 provided in the inductor L1 of the step-up chopper 1 as the same polarity, and there is no restriction when the circuit element is mounted on the board. The degree of freedom increases.

  According to the present embodiment, inrush current can be suppressed by the current limiting means, and the voltage for driving the switch means is always a constant output voltage even if the power supply voltage fluctuates, etc. The current limiting means can be prevented from generating heat or oscillating, power loss on the circuit can be suppressed as much as possible to reduce power consumption, and noise can also be prevented.

  In addition, there are various advantages such as no restrictions on circuit board mounting of circuit elements and improved design freedom.

  Next, a second embodiment of the power supply device and discharge lamp lighting device according to the present invention will be described.

  3 to 6 show a second embodiment of the present invention, FIG. 3 is a circuit configuration diagram showing a basic configuration, FIG. 4 is a circuit configuration diagram showing a first application example, and FIG. 5 is a second application configuration. FIG. 6 is an operation explanatory diagram showing an operation state.

  In FIG. 3, 11 is a commercial power source which is an AC power source, 12 is a diode bridge for full-wave rectification of the commercial power source, Q11 is switch means composed of SCR, 13 is a trigger circuit connected in parallel to the switch means Q11, C11 Is a smoothing capacitor, and 14 is a load.

  The trigger circuit 13 includes a drive power supply 15 and a drive determination circuit 16. The drive power supply 15 includes a series circuit including a resistor R11, a diode D11, and a smoothing capacitor C12.

  The drive discriminating circuit 16 includes a series circuit of a Zener diode ZD1 having a polarity opposite to that of the diode D11 and a resistor R12 connected in parallel to the SCR which is the switch means Q11, and a resistor R13 and a resistor R14 in parallel with the smoothing capacitor C12. And the base terminal of the transistor Q12 is connected to an intermediate point between the Zener diode ZD1 and the resistor R12, and the gate terminal of the SCR which is the switching means Q11 is connected to the intermediate point between the resistor R13 and the resistor R14. It is comprised by connecting to.

  In the above, voltage waveforms generated on the circuit will be described with reference to FIG. 6. FIG. 6 (a) shows the waveform of the AC power supply 11 (arrow a in FIG. 3). The full-wave rectified waveform of FIG. 6B is generated (arrow b in FIG. 3).

  6C shows the waveform of the base terminal of the transistor Q12 (point of FIG. 3c), and FIG. 6D shows the waveform generated at both ends of the SCR which is the switch means Q11 (arrow d in FIG. 3).

  Next, the operation of the above embodiment will be described.

  FIG. 6 is an operation explanatory diagram showing an operation state.

  When the power is turned on, the commercial power supply is full-wave rectified by the 11 diode bridge 12, the capacitor C12 is charged through the resistor R11, and becomes the drive power supply 15 of the drive determination circuit 16 having the Zener diode ZD1.

  The zener diode ZD1 of the drive discriminating circuit 16 discriminates whether or not to drive the SCR which is the switch means Q11. The zener diode ZD1 has a characteristic of being turned off below a predetermined voltage, and has the power supply voltage shown in FIG. The Zener diode ZD1 is turned off at the valley, and the waveform of FIG. 6C is generated at the base terminal of the transistor Q12.

  When the zener diode ZD1 is turned off, the transistor Q12 supplies the trigger signal shown in FIG. 6D to the SCR gate serving as the switch means Q11 to turn on the SCR.

  The SCR performs a zero cross switch operation in response to a trigger signal, and a predetermined direct current is supplied to the smoothing capacitor C11 to control the load 14, and the inrush current is suppressed.

  Further, when the SCR is turned on, the trigger circuit 13 composed of the drive power supply 15 and the drive determination circuit 16 is short-circuited, and the device is driven with low power consumption without consuming power by a resistance element or the like constituting the trigger circuit 13. can do.

  Next, application examples in the present embodiment will be described.

  4 is a circuit configuration diagram showing a first application example, and FIG. 5 is a circuit configuration diagram showing a second application example.

  In the first application example shown in FIG. 4, a load 22 is connected to the circuit configuration in the second embodiment via a step-up chopper circuit 21, and a reactor L21, a diode D21 and a smoothing are connected to both ends of a capacitor C21. A step-up chopper circuit 21 composed of a capacitor C22 is connected, and a load 22 is connected to both ends of the smoothing capacitor C22.

  This first application means that the smoothing capacitor C11 in the second embodiment is also operated in the same manner as the smoothing capacitor C22 provided via the reactor L21, and is included in the scope of the present invention. Yes.

  Other configurations and operations are the same as those in the first embodiment.

  In the second application example shown in FIG. 5, a load 32 as a discharge lamp lighting device is connected to the circuit configuration in the second embodiment via a boost chopper circuit 31 having the same configuration as in the first application example. Is.

  The discharge lamp lighting device includes a half-bridge type inverter circuit 33 and a lighting circuit unit 34 including a discharge lamp.

  Other configurations and operations are the same as those in the first embodiment.

  According to the present embodiment, since the switch means is driven when the voltage is equal to or lower than the predetermined voltage, a zero-cross switch is possible, and the inrush current can be suppressed reliably at low cost.

  Furthermore, since the trigger circuit can be short-circuited by the switch means during operation, power loss on the circuit can be suppressed as much as possible to reduce power consumption.

  In addition, there is no restriction when the circuit element is mounted on the substrate, and the degree of freedom in design is improved. In addition, since there is no resistance as a current limiting means, there are various advantages such as cost reduction.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the present invention.

The circuit block diagram which shows the basic composition in 1st embodiment of this invention. Operation | movement explanatory drawing which shows the operation state in 1st embodiment of this invention. The circuit block diagram which shows the basic composition in 2nd embodiment of this invention. The circuit block diagram which shows the 1st application example in 2nd embodiment of this invention. The circuit block diagram which shows the 2nd application example in 2nd embodiment of this invention. Operation | movement explanatory drawing which shows the operation state in 2nd embodiment of this invention. The circuit block diagram which shows the conventional basic composition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 DC power supply 3 Voltage doubler means 4 Boost chopper circuit L1 Inductor L12 Secondary winding R1 Current limiting means Q1 Switch means

Claims (4)

DC power source obtained by full-wave rectification of AC power source;
A step-up chopper circuit that includes an inductor having a secondary winding and boosts the voltage of the DC power supply;
Current limiting means connected between the DC power supply and the step-up chopper circuit, switch means connected in parallel to the current limiting means, and voltage doubler rectifier connected to the secondary winding and driving the switch means An inrush current suppressing device comprising means;
A power supply device comprising: A power supply device according to claim 1;
An inverter connected to the power supply;
A discharge lamp energized by an inverter;
A discharge lamp lighting device comprising: DC power source obtained by full-wave rectification of AC power source;
Switch means connected between the DC power source and the smoothing capacitor;
An inrush current suppression device connected in parallel to the switch means and having a drive power supply and a drive discrimination circuit, and comprising a trigger circuit for driving the switch means when the power supply voltage falls below a predetermined voltage;
A power supply device comprising: A power supply device according to claim 3;
An inverter connected to the power supply;
A discharge lamp energized by an inverter;
A discharge lamp lighting device comprising:

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