JPH09308258A - Power supply device, discharge lamp lighting device, and lighting device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To reliably start an inverter with an inexpensive starting circuit. SOLUTION: When the power is turned on, a rectified current from a rectifier circuit 2 charges a capacitor C1 through a resistor R1 and its terminal voltage is applied to the gate of a transistor Q1. When the voltage exceeds a predetermined voltage, the transistor Q1 turns on. When the transistor Q1 turns on, the rectified current is
1, the primary side CT1 of the saturable transformer, the linkage transformer 3, and the capacitor C4. At this time, capacitor C
The charge of 1 is discharged through the transistor Q1, and when the voltage becomes equal to or lower than the predetermined voltage, the transistor Q1 is turned off,
A current reverse to the above flows in the primary side CT1 of the saturable transformer, turns on the transistor Q2, and thereafter switches the transistors Q1 and Q2. Transistor Q1,
When Q2 switches, a high frequency voltage is generated in the resistor R5, and this voltage causes the transistor Q3 to switch, discharging the charge in the capacitor C1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device that outputs a high frequency voltage to a load, a discharge lamp lighting device that lights a discharge lamp using the power supply device, and a lighting device that uses the discharge lamp lighting device.

[0002]

2. Description of the Related Art FIG. 1 is a circuit diagram showing a configuration example of a conventional discharge lamp lighting device. In this example, a circuit for increasing the input power factor and reducing the harmonic component of the input current by flowing the charging current from the AC power source 1 side to the capacitor C4 to reduce the level of the harmonic component of the AC power source 1 side. The composition is adopted.

When the power source is turned on, the alternating current supplied from the commercial power source 1 is input to the rectifier circuit 2 through the filter 5 for preventing harmonic leakage and is rectified there. The rectified current from the rectifier circuit 2 flows to the capacitor C1 through the resistor R1 and charges the capacitor C1. As a result, when the charging voltage of the capacitor C1 rises and exceeds the trigger voltage of the trigger diode TD, the trigger diode TD turns on,
The discharge voltage from the capacitor C1 is applied to the gate of the field effect transistor (hereinafter simply referred to as transistor) Q2 via the resistors R8 and R6, and the transistor Q2
Turn on. As a result, the rectified current of the rectifier circuit 2 flows through the capacitor C4, the primary side of the linkage transformer 3, the primary side CT1 of the saturable transformer, and the transistor Q2. When the transistor Q2 is turned on, the diode D1 is turned on, the charge of the capacitor C1 is discharged to the transistor Q2 side through the diode D1, and its terminal voltage becomes low level. Turn off the diode TD.

When the transistor Q2 is turned off, a current flows in the direction of leakage transformer 3 → saturable transformer CTCT1 → body diode of transistor Q1 → capacitor C4, and then the saturable transformer is saturated and the primary of the saturable transformer is reached. A current flows in the opposite direction to the side CT1, and the voltage generated in the secondary side CT21 of the saturable transformer is applied to the gate of the field effect transistor (hereinafter simply referred to as transistor) Q1 to turn on the transistor Q1. . As a result, the discharge current of the capacitor C4 flows through the transistor Q1, the primary side CT1 of the saturable transformer, and the primary side of the linkage transformer 3. This allows
The voltage generated in the secondary side CT21 of the saturable transformer is continuously applied to the gate of the transistor Q1 and this transistor Q1 is kept in the ON state, but when the saturable transformer is saturated, the voltage generated in the secondary side CT21 disappears. ,
The transistor Q1 turns off.

When the transistor Q1 is turned off, a current flows from the primary side of the capacitor C5 and the linkage transformer 3 to the primary side of the saturable transformer, and after resetting the saturable transformer, the secondary side of the saturable transformer. The voltage generated at CT22 is applied to the gate of transistor Q2, turning on transistor Q2. After that, the transistor Q
1 and Q2 start switching at high frequency, and high frequency current flows through the primary side of the linkage transformer 3, so
A boosted high-frequency voltage is generated on the next side, and this high-frequency high-frequency voltage is applied to the discharge lamp 4 to light the discharge lamp 4.

However, since the starting circuit of the transistor Q2 which constitutes the above-mentioned inverter uses an expensive trigger diode TD, there is a problem that the discharge lamp lighting device becomes expensive. Further, since the field effect transistor activates the bipolar transistor in particular, the width of the pulse voltage is narrow, and a voltage for sufficiently turning on the field effect transistor is not generated. When the discharge lamp 4 is removed from the device shown in FIG. 1, the power supply device outputs a high frequency voltage to a load.

[0007]

As described above, in the conventional discharge lamp lighting device, when the power is turned on, the capacitor C1 is charged with the rectified current, and when the terminal voltage rises, the trigger diode TD is turned on to turn on the capacitor C1. By applying the discharge voltage to the gate of Q2 of the transistor that constitutes the inverter and turning on Q2 of this transistor, switching of Q1 and Q2 of the transistor that constitutes the inverter is activated, but an expensive trigger is used for the activation circuit. Since the diode TD is used, the discharge lamp lighting device is expensive.

Therefore, the present invention has been made to solve the above problems, and a power supply device for reliably starting an inverter by an inexpensive starting circuit, and an inverter using the power supply device for ensuring an inexpensive starting circuit. It is an object of the present invention to provide a discharge lamp lighting device that can be activated at any time, and an inexpensive lighting device that uses the discharge lamp lighting device.

[0009]

The invention according to claim 1 is based on a DC power supply; a switching circuit having at least one switching element, to which the voltage of the DC power supply is applied; and on / off of the switching element. An output circuit for outputting a high frequency voltage to energize the load; a feedback means for feeding back a part of the high frequency output to turn on / off the switching element; after charging the direct current voltage supplied from the direct current power source at the time of starting A starting capacitor for applying the discharge voltage to a control terminal of one switching element constituting a switching circuit; a charging resistor for supplying a charging current to the starting capacitor;
When the switching circuit starts switching, a discharge circuit for rapidly discharging the electric charge of the starting capacitor by using the alternating current generated at the control terminal of the switching element which is first started as a trigger.

With this configuration, when the power is turned on, the charging voltage of the starting capacitor is increased by the DC voltage supplied from the DC power source, and the terminal voltage of this capacitor is applied to the control terminal of the switching element. When this terminal voltage exceeds a predetermined voltage, the switching element is turned on. When the saturable transformer CT1 is saturated and the switching element is turned off, another switching element is turned on and the switching operation of the switching circuit is activated. When the switching circuit switches at high frequency,
A high-frequency voltage is generated at the control terminal of the switching element that is activated first, but the discharge circuit forms a path that short-circuits both ends of the starting capacitor by using this voltage as a trigger to discharge the electric charge of this capacitor, Since the terminal voltage is set to the low level, it does not affect the normal switching of the switching element of the switching circuit thereafter. When the oscillation stops, the DC voltage rises again and the system restarts. When the switching circuit switches, a high frequency voltage is output from the output circuit to the load. The DC power source here includes a pulsating current obtained by rectifying a commercial power source by a rectifier circuit, and the same applies to other claims.

According to a second aspect of the present invention, there is provided a DC power supply; a switching circuit having at least one switching element, to which the voltage of the DC power supply is applied; outputting a high frequency voltage based on ON / OFF of the switching element. An output circuit for energizing a load; a feedback means for feeding back a part of a high frequency output to turn on / off a switching element; charging a direct current voltage supplied from the direct current power source at startup, and then switching the discharge voltage A starting capacitor that is applied to the control terminal of one switching element that forms the circuit; a charging resistor that causes a charging current to flow through the starting capacitor; a switch that stops charging the starting capacitor when the switching circuit starts switching. And means;

With this configuration, when the power is turned on, the charging voltage of the starting capacitor is increased by the DC voltage supplied from the DC power source, and the terminal voltage of this capacitor is applied to the control terminal of the switching element. When this terminal voltage exceeds a predetermined voltage, the switching element is turned on. When the switching circuit switches at a high frequency, the switch means is turned off, and the charge of the starting capacitor flows from the control terminal circuit of the switching element which is initially started to the switching element side and is discharged.
Since the terminal voltage is set to the low level, the switching element of the switching circuit is not affected thereafter. When the switching circuit switches, a high frequency voltage is output from the output circuit to the load. Since the on / off cycle of the switching element is considerably shorter than the charging time constant of the starting capacitor, the electric charge of the starting capacitor is discharged through this switching element.

According to a third aspect of the present invention, a DC power source; a switching circuit having at least one switching element, to which the voltage of the DC power source is applied; and a high frequency voltage based on ON / OFF of the switching element is output. An output circuit for energizing the discharge lamp; a feedback means for feeding back a part of the high frequency output to turn on / off the switching element; after charging the direct current voltage supplied from the direct current power source at the time of starting, the discharge voltage A starting capacitor that is applied to the control terminal of one switching element that constitutes the switching circuit; a charging resistor that causes a charging current to flow through the starting capacitor; a control of the switching element that is first started when the switching circuit starts switching. A discharge circuit for rapidly discharging the electric charge of the starting capacitor by using the alternating current generated at the terminal as a trigger; There.

With this configuration, when the power is turned on, the DC voltage supplied from the DC power supply increases the charging voltage of the starting capacitor, and the terminal voltage of the capacitor is applied to the control terminal of the switching element. When this terminal voltage exceeds a predetermined voltage, the switching element is turned on. When the switching circuit switches at a high frequency, a high frequency voltage is generated at the control terminal of the switching element that is activated first, but the discharge circuit forms a path that short-circuits both ends of the starting capacitor by using this voltage as a trigger. Since the electric charge of the capacitor is discharged to bring its terminal voltage to a low level, the switching element of the switching circuit is not affected thereafter. When the switching circuit switches, a high frequency voltage is output from the output circuit to the discharge lamp and the discharge lamp is lit.

According to a fourth aspect of the present invention, the discharge circuit has a resistor for allowing an AC voltage generated at the control terminal to which the discharge voltage of the starting capacitor is applied to flow through the capacitor; and a collector and an emitter at both ends of the starting capacitor. Connect in parallel,
And a transistor that is turned on / off by a voltage generated in the resistor.

With such a configuration, when the switching circuit is activated and switched at a high frequency, an AC voltage is generated at the control terminal of the switching element that is activated first, and this AC flows into the resistor through the capacitor. To do. As a result, the transistor is turned on / off, both terminals of the starting capacitor are short-circuited, and the on / off cycle of the transistor is considerably shorter than the charging time constant of the starting capacitor, so that the charging voltage to the starting capacitor does not rise.

According to a fifth aspect of the present invention, the discharge circuit has a resistor for allowing an AC voltage generated at the control terminal to which the discharge voltage of the starting capacitor is applied to flow through the capacitor; and a voltage generated at this resistor is rectified and smoothed. A rectifier circuit; a transistor having a collector and an emitter connected in parallel to both ends of the starting capacitor and being turned on by a DC voltage output from the rectifier circuit.

With such a configuration, when the switching circuit is activated and switched at a high frequency, an alternating current is generated in the control terminal of the switching element which is activated first, and this alternating current is passed through the resistor through the capacitor. When it flows in, an AC voltage is generated in this resistor, and the rectifier circuit rectifies and smoothes this generated voltage to form a DC voltage. As a result, this DC voltage is applied to the base of the transistor,
Since the transistor is turned on, both terminals of the starting capacitor are short-circuited, and the electric charge of the starting capacitor is discharged through this transistor.

According to a sixth aspect of the present invention, a direct current power source; a switching circuit having a plurality of switching elements, to which a voltage of the direct current power source is applied; a high frequency voltage based on ON / OFF of the switching elements is output and discharged. An output circuit for energizing the lamp; a feedback means for inserting a primary side in the output circuit and a secondary side in the switching control circuit to turn on / off the switching element by a positive feedback signal; And a charging resistor for applying a discharging voltage to a control terminal of one switching element constituting a switching circuit after charging the DC voltage to be charged; and a charging resistor for supplying a charging current to the starting capacitor. There is.

With this configuration, when the power is turned on, the charging voltage of the starting capacitor is increased by the DC voltage supplied from the DC power source, and the terminal voltage of this capacitor is applied to the control terminal of the switching element, When this terminal voltage exceeds a predetermined voltage, the switching element is turned on. When this switching element is turned on, the discharge current of the capacitor flows to the switching element side. After that, another switching element is turned on from the feedback means,
The switching operation of the switching circuit is activated. When the switching circuit switches at a high frequency, the switching means is turned off, and the electric charge of the starting capacitor flows from the control terminal circuit of the switching element which is initially started to the switching element side to be discharged, and the terminal voltage thereof becomes low level. Therefore, the switching element of the switching circuit is not restarted thereafter. When the switching circuit switches, a high frequency voltage is output from the output circuit to the discharge lamp and the discharge lamp is lit. Since the on / off cycle of the switching element is considerably shorter than the charging time constant of the starting capacitor, the electric charge of the starting capacitor is discharged through this switching element.

According to a seventh aspect of the present invention, there is provided the discharge lamp lighting device according to any one of the third to sixth aspects; and a lighting device body incorporating the discharge lamp lighting device.

With this configuration, the discharge lamp lighting device incorporated in the main body of the lighting device is turned on.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a first embodiment of a discharge lamp lighting device of the present invention. 1
Is a commercial power supply for supplying alternating current, 2 is a rectifying circuit including a diode bridge for rectifying alternating current, 3 is a linkage transformer for boosting high frequency voltage, 4 is a discharge lamp such as a fluorescent lamp, and C1 is a charge for starting an inverter. A starting capacitor, C2 is a capacitor for inputting an alternating current generated in the base of the transistor Q1 to the resistor R5 side, C3,
C5 is a capacitor forming a resonance circuit, C4 is a charging capacitor for rectifying and smoothing a rectified current (pulsating current) output from the rectifier circuit 2, CT1 is a primary side of a saturable transformer, and a high frequency current is supplied to the primary side. Flows, the secondary CT21, C
If a high frequency voltage is generated at T22 and the primary side is saturated, 2
Generation of the secondary voltage is stopped. Q1 and Q2 are switching transistors (field effect transistors) that form an inverter that outputs a high frequency voltage, and R1 is a capacitor C1.
R2 is a capacitor for charging, which determines the charging time constant of
1, R3 and R4 are resistors for gate bias of the transistor Q1, R5 is a resistor for obtaining the base voltage of the transistor Q3, and R6 and R7 are resistors for gate bias of the transistor Q2.

Here, the transistors Q1 and Q2 constitute a switching circuit, the linkage transformer 3 constitutes an output circuit, and the primary side CT1 and the secondary side CT of the saturable transformer are formed.
Although 21, 21 and CT22 constitute a feedback means, a ballast choke or the like may be used as the feedback means.
Further, the resistors R2, R5 and the transistor Q3 form a discharging circuit. In this example, if the discharge lamp 4 is removed, the power supply device will be configured.

Next, the present embodiment will be described. When the power is turned on, the alternating current supplied from the commercial power source 1 is rectified by the rectifier circuit 2, and this rectified current charges the capacitor C1 through the resistor R1. As a result, the charging voltage of the capacitor C1 rises, and this terminal voltage is applied to the gate of the field effect transistor (hereinafter simply referred to as transistor) Q2. As a result, when the terminal voltage of the capacitor C1 exceeds a predetermined voltage, the transistor Q1 is turned on, and the rectification current of the rectifier circuit 2 causes the transistor Q1, the primary side CT1 of the saturable transformer, the primary side of the linkage transformer 3, and the capacitor Flow through C4. At this time, the capacitor C4 is charged.

When the transistor Q1 is turned on, the charge of the capacitor C1 passes through the gate and is discharged to the source side, so that the gate voltage becomes equal to or lower than the predetermined voltage and the transistor Q1 is turned off. When the transistor Q1 is turned off, the discharge current of the capacitor C4 changes to the linkage transformer 3
To the primary side CT1 side of the saturable transformer, and a voltage for turning on the transistor Q2 is generated in the secondary side CT22 of the saturable transformer to turn on the transistor Q2. As a result, the rectified current from the rectifier circuit 2 flows through the capacitor C5 to the primary side of the linkage transformer 3, the primary side CT1 of the saturable transformer, and the transistor Q2 side. At this time, a voltage for turning on the transistor Q2 is generated in the secondary side CT21 of the saturable transformer, and the on state of the transistor Q2 is maintained.

After that, when the saturable transformer is saturated, the voltage generated on the secondary side CT22 of the saturable transformer disappears and the transistor Q2 is turned off. When the transistor Q2 is turned off, a counter electromotive force is generated in the linkage transformer 3, and a current flowing in the direction of the linkage transformer 3 side is generated in the primary side CT1 of the saturable transformer. This current resets the saturable transformer. , A voltage for turning on the transistor Q1 is generated in the secondary side CT21 of the saturable transformer to turn on the transistor Q1. When the transistor Q1 is turned on, the rectified current of the rectifier circuit 2 flows through the transistor Q1, the primary side CT1 of the saturable transformer, the primary side of the linkage transformer 3 and the capacitor C4, and the transistor Q1 is connected to the secondary side CT21 of the saturable transformer. Continue to generate voltage to turn on the transistor Q
1 is maintained in the ON state, and a voltage for turning off the transistor Q2 is generated in the secondary side CT22 of the saturable transformer to maintain the OFF state of the transistor Q2.

After that, when the saturable transformer is saturated, the voltage generated on the secondary side CT21 of the saturable transformer disappears and the transistor Q1 is turned off. When the transistor Q1 is turned off, the discharge current of the capacitor C4 is the primary side of the linkage transformer 3 and the primary side C of the saturable transformer.
After flowing into the T1 side to reset the saturable transformer, a voltage for turning on the transistor Q2 is generated in the secondary side CT22 of the saturable transformer to turn on the transistor Q2, and at the same time, the transistor Q1 is turned on in the secondary side CT21. Is generated to maintain the off state of the transistor Q1. Thus, the switching of the transistors Q1 and Q2 is started.

When the switching of the transistors Q1 and Q2 is started, a high frequency voltage is generated at the gate of the transistor Q1. Therefore, a high frequency current flows through the series circuit of the capacitor C2 and the resistor R5, and the high frequency voltage is applied to the resistor R5. Therefore, the transistor Q3 turns on and off at a high frequency. Here, the switching cycle of the transistor Q3 is
Since the charging time constant of the capacitor C1 determined by the capacitor C1 and the resistor R1 is extremely short, the charge of the capacitor C1 is discharged through the transistor Q3, the terminal voltage becomes low level, and the transistors Q1 and Q2.
Does not affect the switching.

FIG. 3 is a waveform diagram for explaining the operation when the switching of the transistors Q1 and Q2 is started. The upper waveform in FIG. 3A is the drain current flowing between the drain and source of the transistor Q1 shown in FIG. 2, and the lower waveform is the drain-source voltage. FIG. 3B is an enlarged waveform diagram of the portion indicated by phase A of the waveform shown in FIG. In this portion, the transistor Q1 starts to turn on and off. FIG. 3C is an enlarged waveform diagram of a portion indicated by phase B of the waveform shown in FIG. In this portion, the transistor Q1 is completely turned on and off, and the transistors Q1 and Q2 are switching.

According to the present embodiment, the terminal of the capacitor C1 for charging the starting charge is directly connected to the gate circuit of the transistor Q1 and the terminal voltage of the capacitor C1 is directly applied to the gate of the transistor Q1. ,
A starting circuit for starting the switching of the transistors Q1 and Q2 forming the inverter can be configured without using an expensive trigger diode, and the device can be made inexpensive. Moreover, at startup, the rising terminal voltage of the capacitor C1 is continuously applied to the gate of the transistor Q1 until the transistor Q1 is turned on.
Is surely turned on to activate the switching of the transistors Q1 and Q2, so that the activation property can be improved.

The present invention is not limited to the output side circuit of the inverter shown in the above-mentioned embodiment, and various types such as a discharge lamp lighting device having the circuit configuration of the second embodiment shown in FIG. The same effect can be obtained by applying to the discharge lamp lighting device.

FIG. 5 shows a third embodiment of the discharge lamp lighting device of the present invention.
2 is a circuit diagram showing the configuration of the embodiment of FIG. In this example, the base of a transistor Q3 forming a path for discharging the electric charge of a capacitor C1 for charging a starting charge is connected to a resistor R5 via a rectifying circuit composed of a diode D2 and a capacitor C6. However, the resistor R9 is a base bias resistor of the transistor Q3.

Therefore, in this example, the transistors Q1 and Q
After 2 is switched, the high frequency voltage generated in the resistor R5 is rectified and smoothed by the rectifier circuit to become a direct current voltage, and this direct current voltage is applied to the base of the transistor Q3 to turn on the transistor Q3, thereby turning on the capacitor C1. The charge is being discharged. The other structure is the same as that of the first embodiment shown in FIG. 2, performs the same operation, and has the same effect.

FIG. 6 shows a fourth embodiment of the discharge lamp lighting device of the present invention.
2 is a circuit diagram showing the configuration of the embodiment of FIG. In this example, the terminal of the capacitor C1 for charging the starting charge is directly connected to the base circuit of the transistor Q3, and the same configuration as that of the first embodiment shown in FIG. 2 is adopted. Since the base-emitter of the transistor Q3 is used as a path for discharging the charged electric charge of the transistor Q3, the circuit is extremely simplified.

When the transistors Q1 and Q2 start switching at a high frequency, the switch SW inserted in series with the resistor R1 is turned off. Moreover, since the switching cycle of the transistor Q1 is extremely shorter than the charging time constant of the capacitor C1 determined by the capacitor C1 and the resistor R1,
The electrification of the capacitor C1 is discharged through the transistor Q1, its terminal voltage becomes a low level, and does not affect the switching of the transistors Q1 and Q2. Similar to the first embodiment shown in FIG. In addition, since this circuit is simpler than the starting circuit of the first embodiment, the cost of the device can be further reduced.

FIG. 7 is a perspective view showing the configuration of an embodiment of the illumination device of the present invention. Reference numeral 71 denotes a main body of the lighting device. The main body 71 of the lighting device includes a fluorescent lamp 7 which is a kind of a discharge lamp.
2 is installed. This fluorescent lamp 72 is lit by the discharge lamp lighting device shown in FIGS. 2, 4, 5, and 6,
This discharge lamp lighting device is built in the lighting device main body 71. In this example, the starting performance of the inverter of the built-in discharge lamp lighting device is improved and the device is inexpensive, so that the fluorescent lamp 72 can be stably and reliably lit in the direction of reducing the cost.

[0038]

As described above, claims 1, 3, 4, 5
According to the invention, the terminal voltage of the starting capacitor is directly applied to the control terminal circuit of the switching element, and after switching, the electric charge of the starting capacitor is discharged by the discharge circuit that operates using the alternating current generated at the control terminal as a trigger. By doing so, the switching of the switching element can be surely started by an inexpensive starting circuit in which the trigger diode is omitted.

According to the present invention, the terminal voltage of the starting capacitor is directly applied to the control terminal circuit of the switching element, and after switching, the electric charge of the starting capacitor is discharged to the switching element side through the control terminal. By doing so, the switching of the switching element can be surely started by the extremely simple starting circuit without the trigger diode, and the circuit can be made extremely simple and inexpensive.

According to the invention of claim 7, the cost of the lighting device can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration example of a conventional discharge lamp lighting device.

FIG. 2 is a circuit diagram showing a configuration of a first embodiment of a discharge lamp lighting device of the present invention.

FIG. 3 is a waveform diagram illustrating an operation of the switching transistor illustrated in FIG. 2 at startup.

FIG. 4 is a circuit diagram showing a configuration of a second embodiment of a discharge lamp lighting device of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a third embodiment of a discharge lamp lighting device of the present invention.

FIG. 6 is a circuit diagram showing a configuration of a fourth embodiment of a discharge lamp lighting device of the present invention.

FIG. 7 is a perspective view showing a configuration of an embodiment of a lighting device of the present invention.

[Explanation of symbols]

 1 ... Commercial power supply 2 ... Rectifier circuit 3 ... Linkage transformer 4 ... Discharge lamp 5 ... Filter C1 to C6 ... Capacitor CT1 ... Primary side of saturable transformer CT21, CT22 ... Secondary side of saturable transformer D2 ... Diodes Q1 and Q2 ... Switching transistor Q3 ... Discharging transistors R1 to R9 ... Resistors

Claims (7)

[Claims] 1. A direct current power source; a switching circuit having at least one switching element, to which a voltage of the direct current power source is applied; a high-frequency voltage based on ON / OFF of the switching element is output to energize a load. An output circuit; feedback means for feeding back a part of high-frequency output to turn on / off a switching element; charging a direct current voltage supplied from the direct current power supply at the time of start-up, and then forming a discharge voltage thereof into a switching circuit 1 A starting capacitor applied to the control terminals of the individual switching elements; a charging resistor for supplying a charging current to the starting capacitors; an alternating current generated at the control terminals of the switching elements that are first started when the switching circuit starts switching. And a discharge circuit for rapidly discharging the electric charge of the starting capacitor by using as a trigger; Place. 2. A DC power supply; a switching circuit having at least one switching element, to which the voltage of the DC power supply is applied; a high frequency voltage based on ON / OFF of the switching element is output to energize the load. An output circuit; feedback means for feeding back a part of high-frequency output to turn on / off a switching element; charging a direct current voltage supplied from the direct current power supply at the time of start-up, and then forming a discharge voltage thereof into a switching circuit 1 A starting capacitor applied to the control terminals of the individual switching elements; a charging resistor for supplying a charging current to the starting capacitor; and a switch means for stopping the charging of the starting capacitor when the switching circuit starts switching. A power supply device characterized by the above. 3. A direct current power supply; a switching circuit having at least one switching element, to which a voltage of the direct current power supply is applied; a high frequency voltage based on ON / OFF of the switching element is output to energize the discharge lamp. Output circuit to
Turn on the switching element by feeding back a part of the high frequency output.
Feedback means for turning off; a starting capacitor for charging a DC voltage supplied from the DC power supply at the time of starting, and then applying the discharge voltage to a control terminal of one switching element forming a switching circuit; a starting capacitor A charging resistor that causes a charging current to flow through; a discharging circuit that, when the switching circuit starts switching, rapidly discharges the electric charge of the starting capacitor by the AC current generated at the control terminal of the switching element that is first started; A discharge lamp lighting device characterized by being provided. 4. The discharge circuit includes a resistor for allowing an AC voltage generated at a control terminal to which the discharge voltage of the starting capacitor is applied to flow through the capacitor; and a collector and an emitter connected in parallel to both ends of the starting capacitor, The discharge lamp lighting device according to claim 2, further comprising: a transistor that is turned on / off by a voltage generated in the resistor. 5. The discharge circuit comprises a resistor for allowing an AC voltage generated at a control terminal to which a discharge voltage of a starting capacitor is applied to flow through the capacitor; a rectifier circuit for rectifying and smoothing a voltage generated at the resistor; and a collector. And a transistor in which the emitter is connected in parallel to both ends of the starting capacitor and which is turned on by the DC voltage output from the rectifier circuit;
A discharge lamp lighting device comprising: 6. A direct current power supply; a switching circuit having a plurality of switching elements, to which a voltage of the direct current power supply is applied; a high frequency voltage based on ON / OFF of the switching elements is output to energize a discharge lamp. Output circuit ;; primary side is inserted in the output circuit, secondary side is inserted in the switching control circuit, and the switching element is turned on by the positive feedback signal.
Feedback means for turning off; a starting capacitor for charging a DC voltage supplied from the DC power supply at the time of starting, and then applying the discharge voltage to a control terminal of one switching element forming a switching circuit; a starting capacitor A discharge lamp lighting device, comprising: a charging resistor that causes a charging current to flow therethrough; and a switch unit that stops charging the starting capacitor when the switching circuit starts switching. 7. A lighting device comprising: the discharge lamp lighting device according to any one of claims 3 to 6; and a lighting device main body incorporating the discharge lamp lighting device.