JP2011249082A - Discharge lamp lighting device, luminaire, and illumination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device, a luminaire, and an illumination system that improve electric power efficiency by improving reliability on heat.SOLUTION: The discharge lamp lighting device includes a DC power supply circuit 2 which has a rectifying circuit 2a for rectifying an AC voltage V1 and outputs a DC voltage V2, and a high-frequency converting circuit 3 which converts the DC voltage V2 into a high-frequency voltage and supplies it to a discharge lamp La. The high-frequency converting circuit 3 comprises an inverter circuit 3a which convers the DC voltage V2 into the high-frequency voltage, a series resonance circuit 3b in which an inductor L1 and a capacitor C4 are connected in series and the discharge lamp La is connected to the capacitor C4 in parallel, a preheating circuit which supplies a preheating current to a filament F of the discharge lamp La, and an inverter control circuit 3c which controls the inverter circuit 3a. The rectifying circuit 2a has diodes D1, D2, which are composed of wide-gap semiconductors having a band gap of equal to or larger than 2.0 eV.

Description

  The present invention relates to a discharge lamp lighting device, a lighting fixture, and a lighting system for lighting a discharge lamp.

  Conventionally, a discharge lamp lighting device for lighting a discharge lamp has been provided. A conventional discharge lamp lighting device has a rectifier circuit that rectifies an AC voltage supplied from a commercial power source and outputs a DC voltage, and the switching element is controlled to oscillate to convert the DC voltage into a high-frequency voltage. A high-frequency conversion circuit that converts and supplies it to the discharge lamp. And in order to control the output to a discharge lamp, there exists the structure which controls the DC voltage which a DC power supply circuit outputs, or the structure which controls the high frequency electric power supplied to a discharge lamp.

  A boost chopper circuit is generally used as a configuration for controlling a DC voltage output from a DC power supply circuit. The boost chopper circuit boosts the rectified voltage output from the rectifier circuit to a predetermined DC voltage and outputs the boosted voltage. In recent years, a boost chopper is often used as a measure for improving harmonic distortion of input current.

  As a configuration for controlling high-frequency power, a method of controlling oscillation of a switching element so that a lamp current flowing through a discharge lamp becomes a predetermined value has been proposed (see, for example, Patent Document 1). Based on the detection result of the current detection unit for detecting the lamp current, the control unit for controlling the oscillation of the switching element performs feedback control so that the lamp current becomes a predetermined value by controlling the oscillation frequency or on-duty of the switching element. ing. Thereby, predetermined electric power is supplied to the discharge lamp.

Japanese Patent Laid-Open No. 7-274524

  However, there has been a problem that the power efficiency of the discharge lamp lighting device is reduced due to power loss due to the semiconductor elements constituting the discharge lamp lighting device. Furthermore, there has been a problem that the temperature rise of the semiconductor element due to the power loss of the semiconductor element increases, and the reliability of the discharge lamp lighting device with respect to heat decreases.

  Examples of semiconductor elements that constitute the discharge lamp lighting device include a diode that constitutes a rectifier circuit, a switching element that constitutes an inverter circuit, and a switching element and a diode that constitute a boost chopper circuit.

  This invention is made | formed in view of the said reason, The objective is to provide the reliability with respect to a heat | fever, and to provide the discharge lamp lighting device, lighting fixture, and lighting system which improve power efficiency.

  The discharge lamp lighting device of the present invention includes a wide gap semiconductor having a band gap of 2.0 eV or more.

  In this discharge lamp lighting device, a DC power supply circuit that outputs a DC voltage having a rectifying circuit that rectifies an AC voltage, and a high-frequency conversion circuit that converts the DC voltage into a high-frequency voltage and supplies the high-frequency voltage to the discharge lamp, The high-frequency conversion circuit includes an inverter circuit that converts the DC voltage into the high-frequency voltage, a series resonance circuit in which an inductor and a capacitor are connected in series, and the discharge lamp is connected in parallel to the capacitor, and a filament of the discharge lamp And a control circuit for controlling the inverter circuit, the rectifier circuit is composed of one or more diodes, and the diodes are composed of the wide gap semiconductor. Is preferred.

  In this discharge lamp lighting device, a DC power supply circuit that converts an AC voltage into a DC voltage and one or more switching elements are turned on / off to convert the DC voltage into a high-frequency voltage and supply it to the discharge lamp. A high-frequency conversion circuit, wherein the high-frequency conversion circuit includes an inverter circuit having the switching element, a series resonance circuit in which an inductor and a capacitor are connected in series, and the discharge lamp is connected in parallel to the capacitor, and the discharge lamp And a control circuit that controls the high-frequency voltage by adjusting oscillation of the switching element, and the switching element is made of the wide gap semiconductor. Is preferred.

  In the discharge lamp lighting device, the inverter circuit preferably includes one switching element.

  In this discharge lamp lighting device, a rectifier circuit that rectifies an AC voltage to generate a rectified voltage, and a boost chopper that boosts the rectified voltage and generates a DC voltage at both ends of a capacitor by turning on and off a switching element A DC power supply circuit having a circuit; and a high-frequency conversion circuit that converts the DC voltage into a high-frequency voltage and supplies the high-frequency voltage to a discharge lamp, the high-frequency conversion circuit converting the DC voltage into the high-frequency voltage; A series resonant circuit in which a resonant inductor and a resonant capacitor are connected in series, and the discharge lamp is connected in parallel to the resonant capacitor; a preheating circuit that allows current to flow through the filament of the discharge lamp; and a control circuit that controls the high-frequency voltage; The step-up chopper circuit is interposed between the switching element and the capacitor, and the capacitor Has a diode for preventing current flowing to the switching element from the support, the diode is preferably constructed in the wide-gap semiconductor.

  In this discharge lamp lighting device, it is preferable that the switching element provided in the step-up chopper circuit is formed of the wide gap semiconductor.

  In this discharge lamp lighting device, the wide gap semiconductor is preferably composed of a GaN semiconductor or a SiC semiconductor.

  The lighting fixture of the present invention includes a discharge lamp lighting device, a discharge lamp to which electric power is supplied from the discharge lamp lighting device, and a fixture main body on which the discharge lamp lighting device and the discharge lamp are mounted. The lighting device includes a wide gap semiconductor having a band gap of 2.0 eV or more.

  The lighting system of the present invention includes a plurality of lighting fixtures and a control device that controls the lighting fixtures, and the lighting fixture includes a discharge lamp lighting device and a discharge lamp to which power is supplied from the discharge lamp lighting device. The discharge lamp lighting device and an appliance main body on which the discharge lamp is mounted, the discharge lamp lighting device having a wide gap semiconductor having a band gap of 2.0 eV or more.

  In this illumination system, the control device supplies a DC voltage on which a control signal is superimposed to the discharge lamp lighting device, and the discharge lamp lighting device uses the DC voltage as a driving power source, and based on the control signal, the It is preferable to control lighting of the discharge lamp.

  As described above, according to the present invention, there is an effect that reliability with respect to heat can be improved and power efficiency can be improved.

It is a figure which shows the circuit structure of the discharge lamp lighting device of Embodiment 1 of this invention. It is a figure which shows the external appearance of a lighting fixture same as the above. It is a figure which shows the block configuration of an illumination system same as the above. It is a figure which shows the circuit structure of the discharge lamp lighting device which used the wide gap semiconductor for the inverter circuit. It is a figure which shows the circuit structure of the discharge lamp lighting device of Embodiment 2 same as the above. It is a figure which shows the circuit structure of the discharge lamp lighting device of Embodiment 3 same as the above. It is a figure which shows the circuit structure of the discharge lamp lighting device which used the wide gap semiconductor for the pressure | voltage rise chopper circuit same as the above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The circuit block diagram of the discharge lamp lighting device 1 of Embodiment 1 of this invention is shown. A discharge lamp lighting device 1 according to the present embodiment includes a DC power supply circuit 2, a high frequency conversion circuit 3, and a dimming circuit 4.

  The DC power supply circuit 2 rectifies and smoothes the AC voltage V1 supplied from the commercial power supply AC and outputs the DC voltage V2. The DC power supply circuit 2 is composed of a voltage doubler rectifier circuit including diodes D1 and D2 and capacitors C1 and C2. The diodes D1 and D2 are rectifying diodes, and the capacitors C1 and C2 are smoothing capacitors composed of electrolytic capacitors. A series circuit 2a composed of a diode D1 and a capacitor C1 and a series circuit 2b composed of a diode D2 and a capacitor C2 are connected between the output terminals of the commercial power supply AC. The series circuits 2a and 2b are connected in parallel to each other. Yes. The anode of the diode D1 and the cathode of the diode D2 are connected to one end of the commercial power supply AC. The capacitor C1 has a positive electrode connected to the cathode of the diode D1 and a negative electrode connected to the other end of the commercial power supply AC. The capacitor C2 has a positive electrode connected to the other end of the commercial power supply AC and a positive electrode connected to the anode of the diode D2.

  Then, the charging of the capacitor C1 by the diode D1 and the charging of the capacitor C2 by the diode D2 are alternately repeated, and the DC voltage V2 that is approximately double the AC voltage V1 between the positive electrode of the capacitor C1 and the negative electrode of the capacitor C2. Is generated.

  The high-frequency conversion circuit 3 includes an inverter circuit 3a, a series resonance circuit 3b, a current detection circuit 3d, and a DC voltage detection circuit 3e.

  The inverter circuit 3a includes switching elements Q1 and Q2 and an inverter control circuit 3c. The switching elements Q1, Q2 are composed of n-channel MOSFETs and are connected in series to the output terminal of the DC power supply circuit 2. The switching element Q1 has a drain connected to the positive electrode of the capacitor C1, and a source connected to the drain of the switching element Q2. The switching element Q2 has a source connected to the negative electrode of the capacitor C2 via the resistor R1. The gates of the switching elements Q1, Q2 are connected to the inverter control circuit 3c. The inverter control circuit 3c controls the oscillation of the switching elements Q1 and Q2, and outputs the drive signals S1 and S2 to the switching elements Q1 and Q2, thereby repeatedly turning on and off the switching elements Q1 and Q2. .

  The series resonance circuit 3b is configured by connecting an inductor L1 and a capacitor C4 in series. The inductor L1 is a resonance inductor, and the capacitor C4 is a resonance capacitor. One end of the inductor L2 is connected to a connection point between the switching elements Q1 and Q2 via a DC cut capacitor C3, and the other end is connected to one end of the capacitor C4 via one filament F of the discharge lamp La. . The other end of the capacitor C4 is connected to the source of the switching element Q2 via the other filament F of the discharge lamp La and the resistor R1. That is, the discharge lamp La is connected in parallel to the capacitor C4.

  Further, the current detection circuit 3d detects the current flowing through the switching element Q2 by detecting the voltage across the resistor R1. That is, the current detection circuit 3d detects the lamp current flowing through the discharge lamp La.

  The DC voltage detection circuit 3e detects the DC voltage V2 output from the DC power supply circuit 2.

  Then, the inverter control circuit 3c alternately turns on and off the switching elements Q1 and Q2 based on the dimming signal S3 indicating the dimming degree output from the dimming circuit 4, so that the inverter circuit 3a becomes the DC voltage V2. To generate a high-frequency voltage. When a high-frequency voltage is applied to the series resonance circuit 3b, the filament F is preheated by flowing a current, and a high-frequency starting voltage is applied to the discharge lamp La to light it. Further, the inverter control circuit 3c supplies desired electric power to the discharge lamp La by feedback controlling the oscillation of the switching elements Q1, Q2 using the detection results of the current detection circuit 3d and the DC voltage detection circuit 3e. Can do.

  The series resonant circuit 3b also functions as a preheating circuit for the filament F of the discharge lamp La. Since the filament F of the discharge lamp La is connected between the inductor L1 and the capacitor C4, a resonance current always flows through the filament F when the discharge lamp La is turned on, and the filament F is preheated.

  Further, the diodes D1 and D2 constituting the DC power supply circuit 2 of the present embodiment are constituted by a wide gap semiconductor made of a GaN semiconductor or a SiC semiconductor. A wide gap semiconductor is a semiconductor having a band gap of 2.0 eV or more, and its conduction loss is one to two orders of magnitude smaller than a silicon-based semiconductor used in a conventional rectifier circuit. For this reason, power loss due to the diodes D1 and D2 made of the wide gap semiconductor is smaller than that of the diode made of the silicon-based semiconductor. Therefore, the power loss of the DC power supply circuit 2 can be reduced as compared with the conventional case, and the power efficiency of the discharge lamp lighting device 1 can be improved.

  Further, since the wide gap semiconductor has a small power loss, the temperature rise of the diodes D1 and D2 when the discharge lamp La is turned on can be made smaller than that of the diode made of a silicon-based semiconductor. Therefore, the reliability with respect to the heat | fever of the discharge lamp lighting device 1 improves. Furthermore, it is possible to simplify heat dissipation measures for reducing the temperature rise of the diodes D1 and D2. Further, depending on the circuit configuration, usage environment, and the like, there is a case where a heat dissipation measure such as heat dissipation to the outer case of the case by a heat dissipation sheet is not necessary, and the assembly of the discharge lamp lighting device 1 can be improved and the cost can be reduced. .

  Next, the external view of the lighting fixture 5 provided with the above-mentioned discharge lamp lighting device 1 is shown in FIG. The lighting fixture 5 includes the above-described discharge lamp lighting device 1, the discharge lamps La1 and La2 to which power is supplied from the discharge lamp lighting device 1, and the fixture main body 6 on which the discharge lamp lighting device 1 and the discharge lamps La1 and La2 are mounted. It consists of and. The fixture body 6 is a so-called two-lamp Fuji-type lighting fixture. 6a is a socket to which the discharge lamps La1 and La2 are mounted, and 6b is a white reflector provided on the side facing the discharge lamps La1 and La2.

  Moreover, the block block diagram of the illumination system 7 provided with the some lighting fixture 5 is shown in FIG. The lighting system 7 includes a plurality of lighting fixtures 5 and a control device 8 that controls the lighting fixtures 5. The control device 8 and the plurality of lighting fixtures 5 are connected by a cable Ca, and the lighting fixture 5 turns on the discharge lamp La using a power source supplied from an external power source (not shown) as a driving power source. Then, the control device 8 outputs a control signal S4 via the cable Ca to the discharge lamp lighting device 1 attached to the lighting fixture 5, and the discharge lamp lighting device 1 lights the discharge lamp La based on the control signal S4. Controls lighting such as turning off and dimming. The control signal S4 is composed of a digital signal, a variable DC signal, a PWM signal, or the like.

  Further, the control device 8 supplies a DC voltage on which the control signal S4 is superimposed to the discharge lamp lighting device 1 via the cable Ca. The discharge lamp lighting device 1 may be configured to operate using the DC voltage supplied from the control device 8 as a driving power source and to control the lighting of the discharge lamp La based on the control signal S4 superimposed on the DC voltage. As a result, there is no need for a power supply path from the external power source to the lighting device 1, so that the configuration of the certification system 7 can be simplified. In this case, the illumination lighting device 1 does not require the DC power supply circuit 2.

  Further, the power efficiency can be further improved by configuring the switching elements Q1, Q2 constituting the inverter circuit 3a with wide gap semiconductors. FIG. 4 shows a circuit configuration diagram of a discharge lamp lighting device 1 including switching elements Q3 and Q4 made of a wide gap semiconductor. In addition, since it is the same circuit structure as the discharge lamp lighting device 1 shown in FIG. 1 except switching element Q3, Q4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The switching elements Q3 and Q4 are NPN transistors composed of a wide gap semiconductor made of a GaN semiconductor or SiC semiconductor. Switching element Q3 has a collector connected to the positive electrode of capacitor C1, and an emitter connected to the collector of switching element Q4. The switching element Q4 has an emitter connected to the negative electrode of the capacitor C2 via the resistor R1. The bases of the switching elements Q3 and Q4 are connected to the inverter control circuit 3c. The inverter control circuit 3c controls the oscillation of the switching elements Q3 and Q4, and outputs the drive signals S1 and S2 to the switching elements Q3 and Q4 to alternately turn on and off the switching elements Q3 and Q4. .

  By configuring the switching elements Q3 and Q4 of the inverter circuit 3a with wide gap semiconductors, power loss due to the switching elements Q3 and Q4 can be reduced, and the power efficiency of the discharge lamp lighting device 1 can be further improved. Further, the reliability of the discharge lamp lighting device 1 with respect to heat can be further improved.

(Embodiment 2)
The circuit block diagram of the discharge lamp lighting device 1 of Embodiment 2 is shown in FIG. In the discharge lamp lighting device 1 of the present embodiment, the inverter circuit 3a that constitutes the high-frequency conversion circuit 3 is constituted by a one-stone inverter. Other configurations are the same as the configuration of the discharge lamp lighting device 1 described in the first embodiment, and thus the same reference numerals are given and the description thereof is omitted.

  The inverter circuit 3a of the present embodiment includes a parallel resonant circuit 3f including a capacitor C5 and an inductor L2, a switching element Q5, and an inverter control circuit 3c. The switching element Q5 is an NPN transistor composed of a wide gap semiconductor made of a GaN semiconductor or a Sic semiconductor. The parallel resonant circuit 3f is configured by connecting a capacitor C5 and an inductor L2 in parallel. One connection point is connected to the positive electrode of the capacitor C1, and the other connection point is connected to the collector of the switching element Q5. ing. The switching element Q5 has an emitter connected to the negative electrode of the capacitor C2 via the resistor R1, and a base connected to the inverter control circuit 3c. That is, the parallel resonant circuit 3 f, the switching element Q5, and the resistor R1 are connected in series between the output terminals of the DC power supply circuit 2.

  A series resonant circuit 3a including a capacitor C4 and an inductor L1 is connected to both ends of the parallel resonant circuit 3f, and a discharge lamp La is connected in parallel with the capacitor C4.

  The inverter control circuit 3c controls the oscillation of the switching element Q5. By outputting the drive signal S5 to the switching element Q5, the switching element Q5 is repeatedly turned on and off. Thereby, the DC voltage V2 is converted, a high frequency voltage is generated between both ends of the parallel resonance circuit 3f, and applied to the series resonance circuit 3a, so that the filament F is preheated and the discharge lamp La is turned on.

  Further, since the switching element Q5 of the inverter circuit 3a is formed of a wide gap semiconductor, power loss due to the switching element Q5 can be reduced, and the power efficiency of the discharge lamp lighting device 1 can be improved. Moreover, the reliability with respect to the heat | fever of the discharge lamp lighting device 1 can be improved.

  In addition, since the inverter circuit 3a of the present embodiment is configured by a one-stone inverter, the number of switching elements can be reduced as compared with the inverter circuit 3a of the first embodiment, and the circuit configuration can be simplified. it can.

(Embodiment 3)
FIG. 6 shows a circuit configuration of the discharge lamp lighting device 1 according to the third embodiment. In the discharge lamp lighting device 1 of the present embodiment, the DC power supply circuit 2 includes a step-up chopper circuit 2d, and outputs a predetermined DC voltage V4 to the high-frequency conversion circuit 3, thereby supplying predetermined high-frequency power to the discharge lamp La. Can be supplied. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 1 shown in FIG. 1, and description is abbreviate | omitted.

  The DC power supply circuit 2 according to the present embodiment includes a rectifier diode bridge 2c and a boost chopper circuit 2d. The rectifier diode bridge 2c forms a full-wave rectifier circuit with four rectifier diodes (not shown), and performs full-wave rectification on the AC voltage V1 supplied from the commercial power supply AC and is connected between the output terminals. A rectified voltage V3 is generated at both ends of C6.

  The step-up chopper circuit 2d includes an inductor L3, a diode D3, a switching element Q6, a resistor R2, a capacitor C7, and a step-up chopper control circuit 2e. The switching element Q6 is composed of an n-channel MOSFET, and the capacitor C7 is composed of an electrolytic capacitor. An inductor L3, a diode D3, and a capacitor C6 are connected in series between both ends of the capacitor C6, and a switching element Q6 and a resistor R2 are connected in series with the diode D3 and the capacitor C7. The switching element Q6 has a drain connected to the positive electrode of the capacitor C7 via the diode D3, a source connected to the negative electrode of the capacitor C7 via the resistor R2, and a gate connected to the boost chopper control circuit 2e. The step-up chopper control circuit 2e outputs a control signal S6 for turning on / off the switching element Q6, and detects the current flowing through the switching element Q6 by detecting the voltage across the resistor R2. Then, the boost chopper control circuit 2e turns on / off the switching element Q6 based on the voltage across the resistor R2, thereby generating the DC voltage V4 across the capacitor C7. Further, the step-up chopper circuit 2e of the present embodiment controls the oscillation of the switching element Q6 according to the electric power supplied to the discharge lamp La, and generates a desired DC voltage V4.

  The high-frequency conversion circuit 3 includes an inverter circuit 3a, a series resonance circuit 3b, and a DC voltage detection circuit 3e. The inverter control circuit 3c converts the DC voltage V4 into a high frequency voltage by oscillating the switching elements Q1 and Q2 according to the detection result of the DC voltage detection circuit 3e, and is applied to the series resonance circuit 3b. The filament F is preheated and the discharge lamp La is turned on.

  In the discharge lamp lighting device 1 of the present embodiment, four rectifier diodes constituting the rectifier diode bridge 2c and a diode D3 of the boost chopper circuit 2d are configured by a wide gap semiconductor made of a GaN semiconductor or a Sic semiconductor. Since current always flows through the rectifier diode bridge 2c and the diode D3, the power efficiency of the discharge lamp lighting device 1 by using a wide gap semiconductor can be further improved. Moreover, the reliability with respect to the heat | fever of the discharge lamp lighting device 1 can be improved more.

  Further, as shown in FIG. 7, the switching element Q7 constituting the boost chopper circuit 2d may be constituted by a wide gap semiconductor. The switching element Q7 is composed of an NPN transistor, the collector is connected to the anode of the diode D3, the emitter is connected to the capacitor C7 via the resistor R2, and the base is connected to the boost chopper circuit 2e.

  By configuring the switching element Q7 with a wide gap semiconductor made of a GaN semiconductor or SiC semiconductor, the power loss of the switching element Q7 can be reduced, and the power efficiency of the discharge lamp lighting device 1 can be improved. Moreover, the power efficiency of the discharge lamp lighting device 1 can be further improved. Although the step-up chopper circuit 2d is used in this embodiment, the same effect can be obtained even when a step-down chopper circuit or a step-up / step-down chopper circuit is used.

  Further, the configuration of the discharge lamp lighting device 1 is not limited to the above, and may be configured by combining the circuit configurations of the first to third embodiments.

DESCRIPTION OF SYMBOLS 1 Discharge lamp lighting device 2 DC power supply circuit 3 High frequency conversion circuit 3a Inverter circuit 3b Series resonance circuit 3c Inverter control circuit 3d Current detection circuit 3e DC voltage detection circuit 4 Dimming circuit D1, D2 Diode Q1, Q2 Switching element L1 Inductor C1 C4 Capacitor La Discharge lamp F Filament

Claims (10)

  A discharge lamp lighting device comprising a wide gap semiconductor having a band gap of 2.0 eV or more. A DC power supply circuit that has a rectifying circuit that rectifies an AC voltage and outputs a DC voltage, and a high-frequency conversion circuit that converts the DC voltage into a high-frequency voltage and supplies it to a discharge lamp,
The high-frequency conversion circuit includes an inverter circuit that converts the DC voltage into the high-frequency voltage, a series resonance circuit in which an inductor and a capacitor are connected in series, and the discharge lamp is connected in parallel to the capacitor, and a filament of the discharge lamp And a control circuit for controlling the inverter circuit.
The discharge lamp lighting device according to claim 1, wherein the rectifier circuit includes one or more diodes, and the diodes include the wide gap semiconductor. A DC power supply circuit that converts an AC voltage into a DC voltage, and a high-frequency conversion circuit that converts the DC voltage into a high-frequency voltage and supplies it to a discharge lamp by turning on or off one or more switching elements;
The high-frequency conversion circuit includes an inverter circuit having the switching element, a series resonance circuit in which an inductor and a capacitor are connected in series, and the discharge lamp is connected in parallel to the capacitor, and a preheating current is supplied to the filament of the discharge lamp. A preheating circuit and a control circuit that controls the high-frequency voltage by adjusting the oscillation of the switching element;
The discharge lamp lighting device according to claim 1, wherein the switching element is formed of the wide gap semiconductor.   The discharge lamp lighting device according to claim 3, wherein the inverter circuit includes one switching element. A rectifier circuit that rectifies an AC voltage to generate a rectified voltage, and a DC power supply circuit having a boost chopper circuit that boosts the rectified voltage to generate a DC voltage at both ends of a capacitor by turning on and off a switching element; A high-frequency conversion circuit that converts the DC voltage into a high-frequency voltage and supplies it to a discharge lamp,
The high-frequency conversion circuit includes an inverter circuit that converts the DC voltage into the high-frequency voltage, a series resonant circuit in which a resonant inductor and a resonant capacitor are connected in series, and the discharge lamp is connected in parallel to the resonant capacitor; It is composed of a preheating circuit for supplying current to the filament of the lamp and a control circuit for controlling the high frequency voltage,
The step-up chopper circuit includes a diode that is interposed between the switching element and the capacitor and prevents a current flowing from the capacitor toward the switching element, and the diode includes the wide gap semiconductor. The discharge lamp lighting device according to claim 1, wherein:   6. The discharge lamp lighting device according to claim 5, wherein a switching element provided in the step-up chopper circuit is formed of the wide gap semiconductor.   7. The discharge lamp lighting device according to claim 1, wherein the wide gap semiconductor is composed of a GaN semiconductor or a SiC semiconductor.   The discharge lamp lighting device according to any one of claims 1 to 7, a discharge lamp to which electric power is supplied from the discharge lamp lighting device, an appliance main body for mounting the discharge lamp lighting device and the discharge lamp, A lighting apparatus comprising:   A lighting system comprising: the plurality of lighting fixtures according to claim 8; and a control device that controls the lighting fixtures. The control device supplies a DC voltage superimposed with a control signal to the discharge lamp lighting device,
The lighting system according to claim 9, wherein the discharge lamp lighting device controls the lighting of the discharge lamp based on the control signal using the DC voltage as a driving power source.

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