JP5381137B2 - Discharge lamp lighting device, light source device and igniter - Google Patents

Description

  The present invention relates to a discharge lamp lighting device, a light source device, and an igniter for lighting a low-pressure discharge lamp and a high-pressure discharge lamp with a low-frequency rectangular wave current or a direct current.

High-pressure discharge lamps such as high-pressure mercury lamps, high-pressure sodium lamps, and metal halide lamps are lit with a lighting device that supplies high-frequency current, such as fluorescent lamp electronic ballasts, and so-called acoustic resonance occurs in many lighting frequency ranges. However, the discharge becomes unstable, the arc fluctuates, and in the worst case, it goes out. Therefore, the high pressure discharge lamp is generally lit with a low frequency current or a direct current.
In this specification, “low frequency” is defined as a frequency of 1 kHz or less, and “high frequency” is defined as a frequency exceeding 1 kHz.

  In the case of a low-pressure discharge lamp, even if it is lit with a high-frequency current, an acoustic resonance phenomenon does not occur as in a high-pressure discharge lamp. For example, in the case of a lamp used in industrial equipment, The distance to the lamp is not constant, and the distance varies from several meters to several tens of meters depending on the installation environment. When the distance from the lighting device to the lamp installation location is long, an inductance component and a capacitance component are generated in the electric wire connecting the lighting device and the lamp, and the value changes depending on the length of the electric wire and the wiring method. . If high-frequency current is supplied in such an environment, the inductance and capacity of the wire become impedance, and the rated current cannot be supplied to the lamp, or the no-load secondary voltage before the lamp is lit decreases, causing problems with lamp startability. It may affect the operation of the lighting device, and in the worst case may cause a failure of the lighting device.

Therefore, in recent years, with the circuit configuration shown in FIG. 3, the discharge lamp is lit with a low-frequency rectangular wave current, the acoustic resonance phenomenon with respect to the high-pressure discharge lamp is avoided, and stable discharge that is hardly affected by the wiring length is achieved. The resulting discharge lamp lighting devices have become widespread.
The operation of the lighting device shown in FIG. 3 is a power factor correction circuit composed of a step-up chopper circuit 3 that is a pulsating voltage obtained by rectifying a commercial power source 1 (generally 85V to 276V including a fluctuation range) by a full-wave rectifier 2. Thus, the DC voltage is supplied to the step-down chopper circuit 4 that converts the commercial voltage into a stable DC voltage and controls the lamp current while improving the input power factor.

  Here, in general, in order for the boost chopper circuit 3 to perform an ideal power factor improvement, it is necessary to convert it to a voltage higher than the peak value of the power supply voltage (1.41 times 276V = 389V). However, when the voltage to be converted is set high, components such as a coil 31, a transistor 32, a diode 33, and a capacitor 34 that constitute the boost chopper circuit 3, and a step-down chopper circuit 4 and a bridge circuit 5 that operate in response to the output voltage are configured. As a result, the voltage applied to the parts to be increased increases the cost and size of the lighting device, and the switching loss increases. As a result, the output voltage of the boost chopper circuit 3 is set to about 400V. It is common to do. In the following description, it is assumed that the output voltage of the boost chopper circuit is set to 400V.

  The step-down chopper circuit 4 includes a transistor 41, a diode 42, a coil 43, a capacitor 44, and the like. The step-down chopper circuit 4 receives the output voltage of the step-up chopper circuit 3 and supplies an arbitrary DC current limited by controlling the conduction period of the transistor 41 by PWM control to the bridge circuit 5. That is, the step-down chopper circuit 4 performs AC conversion by a bridge circuit 5 described later, and controls power supplied to the discharge lamp 8 via the igniter circuit 6 and the electric wire 7.

  Further, since the current does not flow through the step-down chopper circuit 4 until the discharge lamp 8 is lit, the output voltage of the step-down chopper circuit 4 becomes substantially equal to 400 V that is the output voltage of the step-up chopper circuit 3. On the other hand, when the discharge lamp 8 is lit, its output voltage is substantially equal to the voltage of the discharge lamp 8 (generated by the current limited by the step-down chopper circuit 4).

  The bridge circuit 5 converts a rectangular wave current obtained by converting the transistors 51 and 54 and the transistors 52 and 53 constituting the bridge circuit 5 into a low-frequency alternating current by alternately turning them on and off at a low frequency. And are supplied to the discharge lamp 8 from the midpoint of each of the transistors 54.

The igniter circuit 6 receives an output voltage of 400 V from the step-down chopper circuit 4 when the discharge lamp 8 is not lit. With this voltage, the capacitor 62 is charged through the resistor 61 and the voltage rises. Both ends of the capacitor 62 are connected to the primary winding of the pulse transformer 64 and the semiconductor switch 63 (an element that conducts when the set voltage is reached). When the voltage at the end of the capacitor 62 becomes the set voltage of the semiconductor switch 63, the semiconductor switch 63 becomes conductive, the voltage of the capacitor 62 is applied to the primary winding of the pulse transformer 64, and the voltage according to the number of turns is the secondary of the pulse transformer. As a result, a pulse voltage is applied to the end of the discharge lamp 8 (see FIG. 4). The discharge lamp 8 causes dielectric breakdown by this pulse voltage, and discharge is started with a current limited by the step-down chopper circuit 4. Further, when the discharge lamp 8 starts discharging, the output voltage of the step-down chopper circuit 4 decreases to the voltage of the discharge lamp 8, so the set voltage of the semiconductor switch 63 is set to a value higher than the lamp voltage of the discharge lamp 8. Thus, after the discharge lamp 8 is lit, the igniter circuit 6 stops functioning.
In general, discharge lamps vary depending on the type of lamp, but in order to perform a smooth dielectric breakdown, in addition to a high peak voltage such as a pulse voltage, an effective value voltage more than twice the lamp voltage may be applied. Necessary.

  Therefore, in the case of the circuit shown in FIG. 3, when the output voltage of the step-up chopper circuit 3 is set to a general value of 400 V, the secondary voltage waveform at no load is changed to a 400 V rectangular wave voltage shown in FIG. Therefore, when the effective voltage necessary for performing the above-mentioned smooth dielectric breakdown is a discharge lamp voltage of 200 V or more, there may be a problem in lamp startability at an effective value voltage of 400 V. .

  Therefore, in order to increase the effective value of the secondary voltage at the time of no load of the discharge lamp lighting device while preventing adverse effects such as an increase in switching loss of the boost chopper circuit 3, an insulation using a boost transformer 45 as shown in FIG. A lighting device that constitutes a switching circuit that uses a type of full-bridge circuit 4 to superimpose a pulse on a higher-voltage rectangular wave as shown in FIG.

In the lighting device shown in FIG. 5, the converter 4 bridges an arbitrary DC current limited by alternately turning on the transistors 41 and 44 and the transistors 42 and 43 at high speed and controlling the conduction period by PWM control. 5 is supplied. That is, also in this apparatus, the converter 4 controls the power supplied to the discharge lamp 8.
Further, until the discharge lamp 8 is lit, a voltage that is twice the step-up ratio of the step-up transformer 45 is output with respect to the voltage of 400 V that is the output voltage of the step-up chopper circuit 3. For example, when the step-up ratio is 1.5, a voltage waveform is obtained by superimposing a pulse voltage on a secondary voltage of 600 V as shown in FIG.

  As a result, compared to the circuit of FIG. 3, it is possible to light up to a discharge lamp having a higher lamp voltage, but on the other hand, the capacity (no load voltage × short circuit current) of the insulation type full bridge circuit 4 is increased. This increases the cost and size of the part. In addition, since the voltage applied to the low-frequency bridge circuit 5 becomes high, there is a problem that the cost increases and the loss also increases at that portion.

  Further, as a method of increasing the secondary voltage at the time of no load of the discharge lamp lighting device while preventing adverse effects such as an increase in switching loss of the step-up chopper circuit 3, the igniter circuit 6 is constituted by an LC resonance circuit as shown in FIG. A lighting device that can be used is also possible.

  In the case of the lighting method shown in FIG. 7, until the discharge lamp 8 is lit, the transistors 51 and 54 and the transistors 52 and 53 of the bridge circuit 5 are connected to the resonance frequency f0 (or resonance) determined by the inductance of the resonance coil 61 and the capacitance of the resonance capacitor 62. By alternately conducting at a frequency close to 1/3 or 1/5 of the frequency, the withstand voltage of the components used in the step-up chopper circuit 3, the step-down chopper circuit 4, and the bridge circuit 5 is not changed, and loss is reduced. Without increasing, a high-frequency secondary voltage having a high peak value and effective value as shown in FIG. 8 can be obtained. In the circuit shown in FIG. 7, after the discharge lamp starts discharging, the operating frequency of the bridge circuit 5 is lowered to the same frequency as in FIG. 3 and FIG. Will be maintained. In the circuit shown in FIG. 7, the pulse transformer is omitted because a high resonance voltage is obtained. However, in order to further improve the startability, an igniter circuit including the pulse transformer is used as in FIGS. You can also.

  This makes it possible to light up to a discharge lamp with a higher lamp voltage compared to the circuit of FIG. 3, but on the other hand, when the distance from the lighting device to the lamp installation location is long, as shown in FIG. Capacitances 71 and 72 are generated between the electric wires 7 connecting the lighting device and the discharge lamp, which are added to the inductance of the resonance coil 61 of the igniter circuit 6 and the capacitance of the resonance capacitor 62, and therefore have a resonance frequency f0 (or a resonance frequency). (1/3 or 1/5 frequency) shifts to f1 and f2 as shown in FIG. Therefore, the resonance voltage V0 obtained at the resonance frequency f0 is inherently lowered to V1 or V2 and the startability of the lamp is lowered, and the rated current cannot be supplied after the lamp is turned on. .

  Further, until the discharge lamp starts discharging, a high-frequency resonance voltage is applied between the electric wire 7 connecting the lighting device and the discharge lamp, and particularly when the electric wire length is long, peripheral devices due to radiation noise generated from the electric wire are used. There are also concerns about obstacles.

JP-A-8-213181

As described above, in the conventional discharge lamp lighting device (for example, FIG. 3), there is a problem in the startability in the lamp having a high lamp voltage at the time of lighting, and the output voltage of the boost chopper circuit is increased in order to improve the problem. If designed, it would be a factor that hinders the cost increase and miniaturization of the lighting device, and in addition, there is a problem that switching loss increases.
In addition, when a switching circuit such as a full bridge circuit that boosts the voltage with a transformer is used instead of the step-down chopper circuit that limits the current without changing the output voltage of the step-up chopper circuit (for example, FIG. 5), the capacitance of the switching circuit (no load) (Voltage × short-circuit current) increases, resulting in an increase in the cost of the portion, and in addition, the voltage applied to the low-frequency bridge circuit also increases, resulting in an increase in cost and loss in that portion.
Further, when the circuit is started at a high speed when starting the lamp and the discharge lamp is started using the high resonance voltage of the LC resonance circuit connected to the bridge circuit (for example, FIG. 7), the cost of the lighting device is increased. Although the increase in switching loss can be suppressed, when the distance from the lighting device to the lamp installation location is long, the resonance voltage decreases due to the capacity between the wires connecting the lighting device and the lamp, and the startability of the lamp decreases. And the problem that the rated current cannot be supplied after the lamp is lit. Furthermore, noise disturbance to peripheral devices at the start of the discharge lamp has been a problem.

  A first aspect of the present invention is a discharge lamp lighting device, a power supply circuit for supplying low frequency power or DC power of 1 kHz or less to a discharge lamp, and an igniter circuit for applying a starting voltage to the discharge lamp. And an electric wire connecting the output end of the power supply circuit and the input end of the igniter circuit, the igniter circuit rectifying the input voltage from the electric wire, and the primary generating the primary AC voltage from the output of the rectifier circuit A voltage generation circuit and a transformer for converting the primary AC voltage to the secondary AC voltage are configured to superimpose the secondary AC voltage on the input voltage from the electric wire, and the primary voltage generation circuit is output from the rectifier circuit. A high frequency conversion bridge circuit, and an inductor and a capacitor for resonating the output of the bridge circuit, all or part of the inductor being the primary winding of the transformer. The secondary winding of the Nsu is a discharge lamp lighting apparatus which is connected in series with the discharge lamp.

  In addition, the transformer is configured such that the number of turns of the secondary winding that generates the secondary AC voltage is larger than the number of turns of the primary winding that generates the primary AC voltage.

According to a second aspect of the present invention, there is provided a light source device including a discharge lamp, a first unit including a power supply circuit for supplying low frequency power or DC power of 1 kHz or less to the discharge lamp, and the discharge lamp. A second unit including an igniter circuit for applying a starting voltage, an electric wire connecting the output end of the first unit and the input end of the second unit, and the output end of the second unit and the discharge The igniter circuit consists of wiring to connect the lamp, and the igniter circuit rectifies the input voltage from the wire, the primary voltage generation circuit that generates the primary AC voltage from the output of the rectifier circuit, and the primary AC voltage to the secondary AC A transformer for converting the voltage into a voltage, and configured to superimpose a secondary AC voltage on the input voltage from the electric wire. The primary voltage generation circuit converts the output of the rectifier circuit to a high frequency, and a bridge circuit. Comprising an inductor and a capacitor to resonate the output of the circuit, the inductor is a primary winding of a transformer, a light source device the secondary winding of the transformer is connected in series with the discharge lamp.
Here, the said electric wire shall be longer than the said wiring.

A third aspect of the present invention is an igniter connected between a discharge lamp and a device for supplying power to the discharge lamp, the first and second input terminals connected to the device side, the discharge lamp side The first and second output terminals connected to the rectifier, the rectifier circuit that rectifies the input voltage from the first and second input terminals, the bridge circuit that converts the output of the rectifier circuit to high frequency, and the output of the bridge circuit are resonated An inductor and a capacitor are provided, and all or part of the inductor is composed of a primary winding of a transformer, a first input terminal is connected to a first output terminal, and a second input terminal is a secondary winding of the transformer. And an igniter connected to the second output terminal.
Here, in the transformer, the number of turns of the secondary winding is set to be larger than the number of turns of the primary winding.

It is a block diagram of the discharge lamp lighting device of the present invention. It is a circuit block diagram of the discharge lamp lighting device by the Example of this invention. It is a circuit block diagram of the discharge lamp lighting device by the modification of this invention. It is a figure which shows the no-load secondary voltage example of the discharge lamp lighting device in this invention. It is a circuit block diagram of the conventional discharge lamp lighting device. It is a figure which shows the example of a no-load secondary voltage of the conventional discharge lamp lighting device. It is a circuit block diagram of the conventional discharge lamp lighting device. It is a figure which shows the example of a no-load secondary voltage of the conventional discharge lamp lighting device. It is a circuit block diagram of the conventional discharge lamp lighting device. It is a figure which shows the example of a no-load secondary voltage of the conventional discharge lamp lighting device. It is a figure which shows the distributed capacity of the electric wire which connects the lighting device and discharge lamp of the conventional discharge lamp lighting device in FIG. It is a figure which shows the no-load secondary voltage characteristic when distributed capacity is added to the electric wire which connects a lighting device and a discharge lamp in the conventional discharge lamp lighting device in FIG.

  FIG. 1A is a block diagram outlining an embodiment of the present invention. The discharge lamp lighting device includes a power supply circuit 100 for supplying low frequency power or direct current power of 1 kHz or less to the discharge lamp 8, an igniter circuit 600 for applying a starting voltage to the discharge lamp 8, and the power supply circuit 100. The electric wire 7 connects the output terminal and the input terminal of the igniter circuit 600.

  FIG. 1B is a circuit configuration diagram specifically showing the discharge lamp lighting device of FIG. 1A. The power supply circuit 100 includes a full-wave rectifier 2, a step-up chopper circuit 3, a step-down chopper circuit 4, and a bridge circuit 5, and these configurations are the same as those shown in FIG. 3 or FIG. The description is omitted. Since the commercial power source 1 (assuming 85 to 276 V), the electric wire 7 and the discharge lamp 8 are the same as those shown in FIG. 3 or FIG.

In this embodiment, the igniter circuit 600 is different from the conventional igniter circuits 6.
The igniter circuit 600 includes a rectifier circuit 610 that rectifies an input voltage from the electric wire 7 (power supply circuit 100), a primary voltage generator circuit 620 that generates a primary AC voltage from the output of the rectifier circuit 610, and a primary AC voltage. A transformer 630 for converting to a secondary AC voltage is provided, and the secondary AC voltage is superimposed on the input voltage from the electric wire 7 (power supply circuit 100). That is, the midpoint of the bridge circuit 5 is connected to both ends of the lamp 8 and also connected to the input of the rectifier circuit 610.

  The power supply circuit 100 is housed in the first unit (housing), and the igniter circuit 600 is housed in the second unit (housing) close to the lamp 8 (each housing is not shown). When the first unit and the second unit are connected by the electric wire 7 and the second unit and the discharge lamp 8 are connected by the wiring 9, the light source device is completed. The electric wire 7 is sufficiently longer than the wiring 9 (in other words, the wiring 9 is short enough to substantially ignore the influence on the electrical characteristics).

  Here, the rectifier circuit 610 includes a rectifier 611 and a capacitor 612. Before starting the discharge lamp, the low-frequency rectangular wave voltage of 400 V supplied from the midpoint of the bridge circuit 5 is rectified and smoothed to a DC voltage of 400 V. Convert.

  The primary voltage generation circuit 620 includes a half bridge circuit composed of transistors 621 and 622 that converts the output of the rectifier circuit 610 to high frequency, and an inductor 630a and a capacitor 623 that resonate the output of the half bridge circuit. Here, although the inductor 630a serves as the primary winding of the transformer 630 as a preferred embodiment, a coil separate from the transformer 630 may be used as the inductor (in other words, all or a part of the inductor may be a transformer). 630 primary winding). Then, the secondary winding 630b of the transformer is connected in series with the lamp 8.

  The transistors 621 and 622 are alternately turned on at a frequency close to the resonance frequency f0 (or 1/3 or 1/5 of the resonance frequency) determined by the inductance of the primary winding 630a and the capacitance of the resonance capacitor 623. A high-frequency resonance voltage can be obtained at both ends of the primary winding 630a. Each transistor 32, 41, 51-54, 621 and 622 is appropriately controlled by a control circuit (not shown) in each block.

  As a result, a high-frequency high-resonance voltage corresponding to the turn ratio is generated in the secondary winding 630 b of the transformer 630, and this is superimposed on the low-frequency rectangular wave voltage of 400 V supplied from the bridge circuit 5. Thereby, the voltage shown in FIG. 2 is applied to the end of the discharge lamp 8, and the discharge lamp 8 can start discharging. Further, by stopping the operation of the transistors 621 and 622 after the discharge lamp 8 is turned on, the igniter circuit 600 stops its function.

  In the above circuit configuration and operation, even if the distance from the lighting device to the lamp installation location is long and a large capacity is generated between the electric wires 7 connecting the lighting device and the discharge lamp, before the discharge lamp 8 starts discharging, Since the applied voltage is a low-frequency rectangular wave voltage, it is not affected by the capacity of the electric wire 7. Therefore, the set secondary voltage can be supplied to the igniter circuit 600. Furthermore, since only a low-frequency rectangular wave voltage is applied between the electric wire 7 connecting the lighting device and the discharge lamp 8 before the discharge lamp 8 starts discharging, the concern about noise disturbance to peripheral devices is also eliminated.

  In the case of this embodiment, unlike the conventional example shown in FIG. 7, a high-frequency voltage is superimposed on a low-frequency rectangular wave voltage of 400 V, so that the resonance voltage generated in the LC resonance circuit is the same. The voltage obtained as the voltage applied to the end of the discharge lamp 8 has the advantage that this embodiment is higher.

  As described above, according to the present invention, a new switching circuit for supplying a high-frequency AC voltage is provided on the discharge lamp side of the electric wire connecting the lighting device and the discharge lamp. Even when the distance is long, the resonant circuit can be applied to the end of the discharge lamp without being affected by the capacitance between the wires and the resonant voltage does not decrease. It became possible to supply the rated current. Moreover, since the secondary voltage of the rectangular wave of the low frequency as usual is applied between the electric wires which connect a lighting device and a discharge lamp by the said circuit structure, there is also a possibility of the noise disturbance to the peripheral device at the time of discharge lamp start-up. It was solved.

In addition, since the primary voltage generation circuit 620 includes a bridge circuit and a resonance circuit, a high voltage can be continuously generated as shown in FIG. 2, so that a lamp that is not pulse-started (for example, a fluorescent lamp) It can also be used as a starting circuit.
Furthermore, a desired starting voltage can be set by adjusting the setting of the driving frequency of the bridge circuit of the primary voltage generating circuit 620. Therefore, it is possible to cope with various lamps having different starting voltages without changing the used parts, which is preferable in production management.

Moreover, although the discharge lamp lighting device and the light source device are shown as examples, the second unit including the igniter circuit 600 is connected between the existing power supply circuit 100 and the discharge lamp 8 (as a general-purpose igniter). It can also be used.
Also in this case, an igniter that outputs a desired starting voltage can be obtained by adjusting the setting of the driving frequency of the bridge circuit of the primary voltage generating circuit 620. In that sense, it is meaningful to configure the primary voltage generation circuit 620 with a bridge circuit.

<Modification>
The above shows the most preferred embodiment of the present invention, but the following modifications are possible.
In the above embodiment, an example of an AC output circuit is shown as the power supply circuit 100, but the power supply circuit 100 may be a DC output circuit. In this case, as will be appreciated by those skilled in the art, the rectifier 611 may be a single diode.

  For example, although the rectifier 611 is illustrated as a full-wave rectifier circuit in the circuit diagram of FIG. 1B, a rectifier circuit known to those skilled in the art such as a half-wave rectifier circuit or a voltage doubler rectifier circuit can be used.

  In the embodiment of FIG. 1B, the switching circuit for applying a high-frequency voltage to the LC resonance circuit in the igniter circuit 600 is a half-bridge circuit. However, as shown in FIG. 1C, the full-bridge circuit comprising transistors 625 to 628 is equivalent. An effect is obtained.

  In the above embodiment, in order to turn on the lamp 8 that requires a high starting voltage, the winding ratio of the transformer 630 is set to the primary winding number <secondary winding number. In the case of a lamp that does not require, the number of primary turns may be greater than or equal to the number of secondary turns.

2. 2. Full wave rectifier 3. Boost chopper circuit 4. Step-down chopper circuit 6. Bridge circuit Electric wire 8. 8. discharge lamp Wiring 100. Power supply circuit 600. Igniter circuit 610. Rectifier circuit 611. Rectifier 612. Capacitor 620.1 Primary voltage generation circuit 621, 622, 625, 626, 627, 628. Transistor 623. Capacitor 630. Transformer 630a. Primary winding 630b. Secondary winding

Claims (5)

A discharge lamp lighting device,
A power supply circuit for supplying low frequency power or DC power of 1 kHz or less to the discharge lamp;
An igniter circuit for applying a starting voltage to the discharge lamp, and an electric wire connecting the output terminal of the power supply circuit and the input terminal of the igniter circuit,
The igniter circuit includes a rectifier circuit that rectifies the low-frequency power or DC power from the electric wire, a primary voltage generator circuit that generates a primary AC voltage from the output of the rectifier circuit, and the primary AC voltage as a secondary A transformer for converting to an alternating voltage, and configured to superimpose the secondary alternating voltage on the input voltage from the wire;
Said primary voltage generating circuit, a bridge circuit for high-frequency converting the output of the rectifier circuit, and the bridge comprises an inductor and a capacitor to resonate the output of the circuit, the primary winding of all or part of the inductor is the transformer A discharge lamp lighting device in which a secondary winding of the transformer is connected in series to the discharge lamp.   2. The discharge lamp lighting device according to claim 1, wherein, for the transformer, the number of turns of the secondary winding that generates the secondary AC voltage is larger than the number of turns of the primary winding that generates the primary AC voltage. apparatus. A light source device,
Discharge lamp,
A first unit including a power supply circuit for supplying low frequency power or DC power of 1 kHz or less to the discharge lamp;
A second unit including an igniter circuit for applying a starting voltage to the discharge lamp;
A wire connecting the output end of the second unit and the discharge lamp, and an electric wire connecting the output end of the first unit and the input end of the second unit , which is longer than the wire , Electric wire to which frequency power or DC power is applied
Consists of
The igniter circuit includes a rectifier circuit that rectifies the low-frequency power or DC power from the electric wire, a primary voltage generator circuit that generates a primary AC voltage from the output of the rectifier circuit, and the primary AC voltage as a secondary A transformer for converting to an alternating voltage, and configured to superimpose the secondary alternating voltage on the input voltage from the wire;
Said primary voltage generating circuit, a bridge circuit for high-frequency converting the output of the rectifier circuit, and the bridge comprises an inductor and a capacitor to resonate the output of the circuit, the primary winding of all or part of the inductor is the transformer A light source device in which a secondary winding of the transformer is connected in series to the discharge lamp. An igniter housed in a housing , connected between a discharge lamp and a device for supplying power to the discharge lamp,
First and second input terminals connected to the device side;
First and second output terminals connected to the discharge lamp side;
A rectifier circuit for rectifying an input voltage from the first and second input terminals;
A bridge circuit capable of high-frequency conversion of the output of the rectifier circuit, the drive frequency setting being adjustable , and an inductor and a capacitor for resonating the output of the bridge circuit;
All or part of the inductor is composed of a primary winding of a transformer, the first input terminal is connected to the first output terminal, and the second input terminal is connected to the secondary winding of the transformer. An igniter connected to the second output terminal.   5. The igniter according to claim 4, wherein the number of turns of the secondary winding is greater than the number of turns of the primary winding in the transformer.

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