JP4337705B2 - Electrodeless discharge lamp lighting device and lighting fixture - Google Patents

Description

  The present invention relates to an electrodeless discharge lamp lighting device that generates a high-frequency electromagnetic field in an induction coil disposed close to a translucent bulb in which a discharge gas is sealed, and a lighting fixture using the same.

  Conventionally, an electrodeless discharge lamp in which a discharge gas is sealed in a light-transmitting bulb has been provided. An induction coil is disposed in the vicinity of the electrodeless discharge lamp, and high-frequency power is supplied to the induction coil from a high-frequency power source. Thus, an electrodeless discharge lamp lighting device is known in which a high frequency electromagnetic field generated around an induction coil is caused to act on a discharge gas so as to light the electrodeless discharge lamp.

  In an electrodeless discharge lamp, if there is a load impedance fluctuation factor, such as a change in ambient temperature or the proximity of a metal housing to the periphery of the electrodeless discharge lamp, the voltage of the induction coil also changes greatly, and stable starting and lighting are performed. It becomes difficult. Therefore, if the start by the frequency sweep is performed, the influence of the load impedance fluctuation can be absorbed, so that the start and the lighting can be stably performed. The start by the frequency sweep can be said to be particularly effective in the case of the electrodeless discharge lamp load.

For example, Japanese Patent Application Laid-Open No. 10-208894 (Patent Document 1) includes a high-frequency oscillator whose oscillation frequency is variable and a power amplifier that amplifies the output of the high-frequency oscillator and outputs high-frequency power, and the power is output from the power amplifier. In an electrodeless discharge lamp lighting device in which high-frequency power is supplied to an induction coil, it has been proposed to realize stable lighting by gradually changing the oscillation frequency of a high-frequency oscillator.
JP-A-10-208894

  By the way, when the electrodeless discharge lamp is covered with a reflecting plate, when the reflecting plate is made of a metal having a high conductivity such as a metal, an induction current due to electromagnetic induction from the induction coil is generated on the reflecting plate. It will flow in a loop. Accordingly, since an inductance component is generated by the reflector, an inductor is connected in parallel to the induction coil in the equivalent circuit. As a result, since the resonance curve at the time of starting and lighting is shifted as compared with the case of a single unit without a reflector, a frequency sweep may be performed up to a region where the voltage of the induction coil decreases. When the voltage is lower than the lighting sustaining voltage, there has been a problem that the electrodeless discharge lamp is extinguished.

  In order to avoid this, it may be possible to adjust the frequency sweep end frequency while attached to an instrument surrounded by a metal casing, but in order to support a wide variety of instruments, Adjustments must be made individually, which is very laborious and costly and is not realistic.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an electrodeless electrode that can be easily lit even when a high-conductivity casing is close to the electrodeless discharge lamp. The object is to provide a discharge lamp lighting device.

  In the electrodeless discharge lamp lighting device of the present invention, in order to solve the above-described problem, as shown in FIG. 1, the electrodeless discharge lamp lighting device in which a discharge gas is sealed in a translucent bulb is provided. The power conversion circuit (inverter circuit 9) that outputs a high-frequency voltage to the induction coil 5 is configured to include at least the switching elements Q3 and Q4 and the resonance circuit (inductor Ls, capacitors Cp, Cs). ), The driving circuit 11 for driving the switching elements Q3 and Q4, and the operating frequency of the driving circuit 11 to gradually increase the voltage Vcoil generated in the induction coil 5 when the electrodeless discharge lamp 6 is started. In the electrodeless discharge lamp lighting device comprising the frequency control circuit 13 for sweeping from the frequency fs to the end frequency fe, the power conversion circuit (inverter) A turn-off detection circuit 14 for detecting the turn-off of the electrodeless discharge lamp 6 by detecting the output of the path 9), and when the turn-off is detected, the sweep end frequency fe is shifted to a high frequency side and set by a fixed value; A restarting means (frequency shift circuit 15) for sweeping again is provided.

  According to the present invention, it has the extinction detection circuit that detects the extinction of the electrodeless discharge lamp by detecting the output of the power conversion circuit, and when the extinction is detected, the sweep end frequency fe is shifted to the high frequency side by a fixed value and set. In addition, since the restarting means for sweeping again is provided, even when the electrodeless discharge lamp is covered with a metal casing, correction can be performed so that the frequency sweep range suitable for the structure is obtained, and stable. The effect is that it can be started.

(Embodiment 1)
FIG. 1 shows a circuit configuration of Embodiment 1 of the present invention. This electrodeless discharge lamp lighting device is supplied with power from an AC power source Vin and outputs a DC voltage VDC, and an inverter circuit 9 that receives power from the DC power source E and outputs a high-frequency voltage Vcoil. And a drive circuit 11 for driving the switching element of the inverter circuit 9, a frequency control circuit 13 for changing the output voltage Vcoil of the inverter circuit 9 by controlling the drive frequency of the inverter circuit 9, and an output of the inverter circuit 9. Induction coil 5, electrodeless discharge lamp 6 disposed in proximity to induction coil 5, extinction detection circuit 14 for detecting the extinction of electrodeless discharge lamp 6, and frequency shift for shifting the frequency sweep range upon receiving the extinction detection Circuit 15.

  The electrodeless discharge lamp 6 has a transparent spherical glass bulb or a spherical glass bulb with an inner surface coated with a phosphor, and a discharge gas (for example, mercury or a rare gas) such as an inert gas or a metal vapor is enclosed therein. Yes.

  The DC power source E includes a boost chopper circuit including a rectifier diode bridge 10, a switching element Q6, an inductor L10, a diode D10, a control circuit 2, and a smoothing capacitor C10.

  The inverter circuit 9 includes switching elements Q3 and Q4, and a resonance circuit including inductors Ls and capacitors Cp and Cs. The inverter circuit 9 supplies a high frequency electric power to the electrodeless discharge lamp 6 by generating a high frequency electromagnetic field in the induction coil 5 by flowing a high frequency current of several tens of kHz to several tens of MHz to the induction coil 5. In response to this, a high-frequency plasma current is generated in the electrodeless discharge lamp 6 to generate ultraviolet rays or visible light.

  The frequency control circuit 13 includes an integration circuit including an operational amplifier Q8, a resistor R1, and a capacitor C1, a charge discharge switch SW0 for the capacitor C1, and the like. When the switch SW0 is switched from ON to OFF, the frequency control circuit 13 receives power supplied from the DC voltage E1, charges the capacitor C1 through the resistor R1, and uses the voltage VC1 across the capacitor C1 as the non-inverting input of the operational amplifier Q8. The voltage Vf is output to the output terminal of the operational amplifier Q8, and the frequency sweep control of the drive circuit 11 is performed.

  The drive circuit 11 varies the operating frequency according to the sink current Isw (= Io) flowing from its input terminal to the frequency control circuit 13, and is controlled so that the drive frequency increases as the current Io increases. , Between the H-GND terminals and between the Lout and L-GND terminals, a substantially rectangular driving signal for the switching elements Q3 and Q4 (the phase difference between them is approximately 180 °) is output. The Hout terminal is a high potential side output terminal, the H-GND terminal is a high potential side ground terminal, the Lout terminal is a low potential side output terminal, and the L-GND terminal is a low potential side ground terminal. The switching elements Q3 and Q4 of the inverter circuit 9 are made of, for example, MOSFETs, and the switching element Q3 is turned on / off by the voltage between the Hout and H-GND terminals, and the switching element Q4 is turned on by the voltage between the Lout and L-GND terminals. -It is driven off.

  In the case of an electrodeless discharge lamp load, since it is an inductor load at the start of ignition, a larger electric power is required at the start than other light sources such as an electrode fluorescent lamp. Therefore, in order to perform stable start-up and lighting, it is necessary to set the Q of the resonance circuit of the inverter circuit 9 high. However, if there is a fluctuation factor of the load impedance of the inverter circuit 9 such as a change in ambient temperature or the proximity of the metal casing to the periphery of the electrodeless discharge lamp 6, the voltage Vcoil of the induction coil also greatly changes, and stable starting and lighting It becomes difficult to do. Therefore, if the start by the frequency sweep can absorb the influence of the load impedance fluctuation, the start and the lighting can be stably performed. The start by the frequency sweep is particularly effective in the case of the electrodeless discharge lamp load. .

  The change of the output voltage Vcoil of the inverter circuit 9 with respect to the operating frequency finv is shown in FIG. 2, and the operation is performed such that the output voltage Vcoil gradually increases by sweeping the operating frequency finv from the start frequency fs toward the end frequency fe. I am letting. Since the electrodeless discharge lamp 6 is designed to exceed the minimum voltage Vth1 required for starting ignition during this frequency sweep, the electrodeless discharge lamp 6 is lit at a certain frequency fi. As soon as the electrodeless discharge lamp 6 is lit, the voltage Vcoil decreases and the operating point moves on the lighting curve in the figure. Here, by setting the end frequency fe near the resonance point in the resonance circuit of the inverter circuit 9, a sufficient output voltage Vcoil can be obtained by sweeping the frequency, and the electrodeless discharge lamp 6 can be easily started. effective.

  FIG. 3 shows an example of the starting operation by frequency sweep. When the AC power supply Vin is turned on and the DC voltage VDC of the DC power supply E rises, the capacitor C1 is charged through the temperature sensitive resistor R1 using the DC power supply E1 as a power supply, and the charging voltage VC1 is constant at a certain set voltage Vce. It gradually increases to become. Similarly, the voltage Vf also increases according to the charging voltage VC1 of the capacitor C1 by the operation of the operational amplifier Q8, and gradually increases so as to be constant at a certain set voltage. Now, if the operating frequency finv of the voltage Vcoil output from the inverter circuit 9 decreases when the voltage Vf increases, the operating frequency finv within the frequency sweep interval = simply decreases from the starting frequency fs. In fi, the electrodeless discharge lamp 6 is lit (t = t2).

  Here, it is assumed that the electrodeless discharge lamp 6 is mounted on a downlight fixture. In the downlight fixture, the electrodeless discharge lamp 6 is covered with a reflecting plate. However, when the reflecting plate is made of a metal having a high conductivity, in particular, the induction current due to electromagnetic induction from the induction coil 5 is reflected. It will flow in a loop on the plate. Accordingly, since an inductance component is generated by the reflector, an inductor is connected in parallel to the induction coil 5 in the equivalent circuit. As a result, as shown in FIG. 2, the resonance curve at the time of start-up and lighting shifts compared to the case where there is no downlight fixture (such as an instrument housing or a reflector).

  As shown in FIG. 3, even after the electrodeless discharge lamp 6 is turned on, the oscillation frequency changes up to the end frequency fe because the capacitor C1 is about to be fully charged, that is, until the voltage VC1 reaches a constant value Vce. To do. However, when the resonance curve is shifted to the high frequency side, the frequency sweep is performed up to the region where the peak of the lighting resonance curve is exceeded and the voltage Vcoil is further reduced. As a result, when the voltage Vcoil is lower than the sustaining voltage Vth2, there has been a problem that the electrodeless discharge lamp 6 disappears.

  In order to avoid this, it is conceivable to adjust the end frequency fe in a state where the end frequency fe is mounted on a device surrounded by a metal casing. Is very laborious and costly and is not realistic.

  Therefore, in the first embodiment, a turn-off detection circuit 14 that detects the turn-off of the electrodeless discharge lamp 6 and a frequency shift circuit 15 that receives the turn-off detection and shifts the frequency sweep range are provided.

  The extinction detection circuit 14 is configured by a so-called window comparator circuit including a voltage dividing and smoothing circuit for both ends of the induction coil 5, resistors R2 to R5, and operational amplifiers Q7 and Q9. Use the open collector type.

  In response to the output voltage Voff of the extinction detection circuit 14, the frequency shift circuit 15 performs frequency shift and restart (switch SW 0: ON → OFF) in the event of extinction, and in accordance with the output of the control circuit 16. It comprises a transistor Q10 for varying the maximum value of the + input terminal voltage (VC1) of the operational amplifier Q8.

  The operation of this embodiment will be described with reference to FIGS. However, it is assumed that the electrodeless discharge lamp 6 is covered with a metal housing such as a downlight reflector. When the switch SW0 is switched from ON to OFF at time t = t1, the frequency control circuit 13 varies the sink current Isw from the drive circuit 11, and frequency sweep control is performed. Thereafter, at time t = t2, the voltage Vcoil> Vth1 (ignition starting voltage) is satisfied, so that the electrodeless discharge lamp 6 is turned on, the voltage VC1 changes until it reaches a constant value Vce (maximum value), and the operating frequency is also finv = Although it changes to fe, since Vcoil <Vth2 (lighting sustaining voltage), the electrodeless discharge lamp 6 disappears at time t = t3 (trajectory A in FIG. 2).

  From FIG. 2, when normal start-up and lighting are performed, the voltage Vcoil is in the range of Vth2 <Vcoil <Vth1. Therefore, the output Voff is set to the H level only when Vth2 <Vcoil <Vth1 by the function of the window comparator of the extinction detection circuit 14. Therefore, if Vcoil <Vth2 (lighting sustaining voltage) and the electrodeless discharge lamp 6 is extinguished, the output Voff becomes L level.

  By inputting this result to the control circuit 16, the control circuit 16 once turns ON the switch SW0 and then switches it OFF, thereby starting the frequency sweep operation again (t = t3 '). In addition, a latch circuit built in the control circuit 16 operates, and a constant base current iB is supplied to the transistor Q10 (however, it is operated in the active region of the transistor Q10). Since the collector current flows according to the base current iB, the maximum value of the voltage VC1 can be substantially reduced. As a result, the end frequency fe is reset to fe + Δf (Δf> 0) (= fe ′) (t = t5). In this frequency sweep operation, a frequency sweep is performed from the start frequency fs to the end frequency fe ′ (the trajectory B in FIG. 2), but since this time Vcoil> Vth2 at the end frequency fe ′, no extinction occurs.

  Therefore, even when the electrodeless discharge lamp 6 is covered with the metal casing, the correction can be performed so that the frequency sweep range suitable for the structure is obtained, and there is an effect that the start can be stably performed. Further, by setting the end frequency fe in the vicinity of the resonance frequency and setting the end frequency fe <start frequency fs, the voltage Vcoil can be operated to gradually increase during the frequency sweep.

  The specific value of the shift frequency Δf is about 0.1% to several percent with respect to the operating frequency of the drive circuit. For example, when the operating frequency is 150 kHz, Δf is about 0.15 kHz to 2.3 kHz. Δf may be a constant value or a variable value.

(Embodiment 2)
FIG. 4 shows a circuit configuration of the second embodiment of the present invention. The description of the same configuration, operation, and effect as in the first embodiment is omitted. The difference from the first embodiment is that the collector circuit of the transistor Q10 is connected to the input of the drive circuit 11, and the drive circuit 11 has a sink current Isw flowing to the frequency control circuit 13 and a collector current Ish of the transistor Q10. The operating frequency is varied according to the sum (= Io).

  The operation will be described with reference to FIGS. After the switch SW0 is switched from ON to OFF at time t = t1, a frequency sweep is performed in the same manner as in the first embodiment, but disappearance occurs at time t = t3 (trajectory A in FIG. 5). As a result, the output Voff becomes L level by the action of the extinction detection circuit 14 and is input to the control circuit 16, whereby a predetermined base current iB flows through the transistor Q10 and a collector current Ish corresponding thereto flows. As a result, both the start frequency fs and the end frequency fe are shifted to a constant value on the high frequency side. That is, the start frequency fs is reset as fs + Δf (Δf> 0) (= fs ′), and the end frequency fe is reset as fe + Δf (Δf> 0) (= fe ′).

  Immediately after that, the control circuit 16 switches the switch SW0 from ON to OFF to start the frequency sweep operation again. This time, the frequency sweep is performed from the start frequency fs ′ to the end frequency fe ′ (trajectory B in FIG. 5). Since Vcoil> Vth2 at the end frequency fe ′, no extinction occurs.

  In the second embodiment, since the start frequency fs is also shifted to the high frequency side as compared with the first embodiment, the frequency sweep width at the time of start-up is increased. For example, even when the resonance curve is further shifted due to a change in ambient temperature or the like. There is an effect that it can be lit stably.

(Embodiment 3)
FIG. 7 shows a circuit configuration of the third embodiment of the present invention. The description of the same configuration, operation, and effect as in the first embodiment is omitted. The difference from the first embodiment is that a clamp circuit 26 is provided between the + input terminal of the operational amplifier Q8 and the control circuit 16. The clamp circuit 26 includes elements such as a diode and a constant voltage diode, and performs voltage clamping on the output side only when extinction is detected by the extinction detection circuit 14.

  The operation of this embodiment will be described with reference to FIGS. After the extinction occurs at time t = t3 (the locus of A in FIG. 5), the output Voff becomes L level by the action of the extinction detection circuit 14 and is input to the control circuit 16, and thereafter the clamp circuit 26 Operates, and voltage clamping is performed at a voltage lower than the maximum value of the voltage VC1. As a result, the end frequency fe is reset to fe + Δf (Δf> 0) (= fe ′), and then the control circuit 16 starts the frequency sweep operation again by switching the switch SW0 from ON to OFF. The frequency sweep from the frequency fs to the end frequency fe ′ (trajectory B in FIG. 5) is Vcoil> Vth2 at the end frequency fe ′, so no disappearance occurs. In the present embodiment, there is an effect that the frequency shift can be stabilized as compared with the case of the control by the weak base current iB in the first embodiment.

(Embodiment 4)
The operation of Embodiment 4 of the present invention is shown in FIG. The description of the same configuration, operation, and effect as in the first embodiment is omitted. The difference from the first embodiment is that after the extinction by the first frequency sweep (the locus of A), if the extinction is not eliminated even if the frequency sweep is performed again with the end frequency set to fe ′ (= fe + Δf), the end frequency is further set. The frequency shift is repeated until the electrodeless discharge lamp 6 is lit without being extinguished as “fe” (= fe + 2Δf),..., and there is an effect that lighting can be performed more reliably. Or either.

  Even if the shift frequency Δf is set to be smaller than the difference between the end frequency fe and the start frequency fs (Δf <fs−fe), Vcoil> Vth2 is obtained as the restart is repeated. There is an effect that it can be lit.

  When the end frequency is shifted a plurality of times in the fourth embodiment, if the configuration is such that the magnitude of the frequency shift Δf is gradually reduced, the operating frequency at the time of lighting does not become too high, and extinction occurs. It is difficult to obtain the effect of more stable lighting.

(Embodiment 5)
FIG. 10 shows a circuit configuration according to the fifth embodiment of the present invention. The description of the same configuration, operation, and effect as in the first embodiment is omitted. The difference from the first embodiment is that a storage circuit 17 that stores an end frequency fe when the electrodeless discharge lamp 6 is lit is connected to the control circuit 16.

  The operation of the present embodiment will be described with reference to FIGS. In the first operation (FIG. 11), as in the first embodiment, when the electrodeless discharge lamp 6 is lit at the end frequency fe ′ (= fe + Δf), the end frequency fe ′ is stored in the storage circuit 17 (that is, The base current iB at that time is stored), and then, for example, when the AC power source Vin is once turned off and then turned on again, the subsequent frequency sweep is changed from the start frequency fs to the stored end frequency fe ′. (FIG. 12). As a result, there is an effect that the electrodeless discharge lamp 6 can be stably lit without falling into the extinction state.

  In other words, in the first operation in FIG. 11, after the frequency sweeps from the start frequency fs to the end frequency fe along the locus A, it disappears, and then the end frequency fe is shifted to fe ′ = fe + Δf, thereby starting on the locus B. By shifting the frequency from the frequency fs to the end frequency fe ′, the stable lighting is performed. In the operation after the next time in FIG. 12 using the end frequency fe ′ stored here, the operation starts with the locus A. By performing a frequency sweep from the frequency fs to the stored end frequency fe ′, the electrodeless discharge lamp 6 can be stably lit without falling into the extinction state.

  When the start frequency fs is shifted as well as the end frequency fe as in the second embodiment, the start frequency fs ′ at the first operation is stored together with the end frequency fe ′, and the subsequent frequency sweep is performed. Is performed from the stored start frequency fs ′ to end frequency fe ′.

(Embodiment 6)
FIG. 13A shows the main circuit configuration of the sixth embodiment of the present invention. The description of the same configuration, operation, and effect as in the fifth embodiment is omitted. The difference from the fifth embodiment is that the storage circuit 17 includes a microcomputer 18, a memory 20 for storing the start frequency fs ′ and the end frequency fe ′, and a backup power source 19 for storing the contents of the memory 20. It is that.

  The backup power source 19 is charged from the voltage across the capacitor C10 after the AC power source Vin is turned on, and the contents of the memory 20 can be stored and retained even after the AC power source Vin is disconnected. Further, if a rechargeable battery, a large-capacity capacitor, or the like is built in as the backup power source 19, there is an effect that the data can be stored for a longer period.

(Embodiment 7)
FIG. 13B shows a circuit configuration of the main part of the seventh embodiment of the present invention. The description of the same configuration, operation, and effect as in the sixth embodiment is omitted. The difference from the sixth embodiment is that the storage circuit 17 stores the start frequency fs ′ and the end frequency fe ′ by a non-volatile memory 21 such as a flash memory, and does not require a backup power source or the like, and the stored content is semipermanently. There is an effect that can be held.

(Embodiment 8)
FIG. 13 (c) shows a main circuit configuration of the eighth embodiment of the present invention. The description of the same configuration, operation, and effect as in the seventh embodiment is omitted. The difference from the seventh embodiment is that a reset switch 22 is provided for resetting the stored contents, and the resonance curve is changed when the instrument structure surrounding the electrodeless discharge lamp 6 is changed or due to a change with time. Even if the shift has occurred, after the stored contents are reset by the reset switch 22, stable start is possible by storing the optimum start frequency fs 'and end frequency fe' again as in the sixth embodiment. is there.

(Embodiment 9)
The electrodeless discharge lamp lighting device described in each of the first to eighth embodiments can be used as, for example, a lighting fixture as shown in FIG. In the figure, 5 is an induction coil, 6 is an electrodeless discharge lamp, and 30 is a metallic reflector. As described above, even when a high-conductivity housing is in the vicinity of the electrodeless discharge lamp 6, if the lighting device of the present invention is used, it can be easily lit by shifting the end frequency fe of the frequency sweep. . Even when the metal reflector 30 is used alone, it can be easily lit regardless of the installation environment by shifting the end frequency fe of the frequency sweep again.

It is a circuit diagram of the electrodeless discharge lamp lighting device of Embodiment 1 of the present invention. It is a characteristic view which shows the resonance characteristic of the electrodeless discharge lamp lighting device of Embodiment 1 of this invention. It is a wave form diagram which shows the operation | movement at the time of start-up of the electrodeless discharge lamp lighting device of Embodiment 1 of this invention. It is a circuit diagram of the electrodeless discharge lamp lighting device of Embodiment 2 of the present invention. It is a characteristic view which shows the resonance characteristic of the electrodeless discharge lamp lighting device of Embodiment 2 of this invention. It is a wave form diagram which shows the operation | movement at the time of start-up of the electrodeless discharge lamp lighting device of Embodiment 2 of this invention. It is a circuit diagram of the electrodeless discharge lamp lighting device of Embodiment 3 of the present invention. It is a wave form diagram which shows the operation | movement at the time of start-up of the electrodeless discharge lamp lighting device of Embodiment 3 of this invention. It is a characteristic view which shows the resonance characteristic of the electrodeless discharge lamp lighting device of Embodiment 4 of this invention. It is a circuit diagram of the electrodeless discharge lamp lighting device of Embodiment 5 of the present invention. It is a characteristic view which shows the resonance characteristic of the electrodeless discharge lamp lighting device of Embodiment 5 of this invention. It is a characteristic view which shows the resonance characteristic of the electrodeless discharge lamp lighting device of Embodiment 5 of this invention. It is a block diagram which shows the structural example of the memory circuit used for the electrodeless discharge lamp lighting device of Embodiments 6-8 of this invention. It is a perspective view which illustrates the structure of the lighting fixture of this invention.

Explanation of symbols

5 Inductive coil 6 Electrodeless discharge lamp 9 Inverter circuit 11 Drive circuit 13 Frequency control circuit 14 Fading detection circuit 15 Frequency shift circuit

Claims (5)

An induction coil disposed close to an electrodeless discharge lamp in which a discharge gas is sealed in a light-transmitting bulb;
A power conversion circuit configured to include at least a switching element and a resonance circuit and outputting a high-frequency voltage to the induction coil;
A drive circuit for driving the switching element;
An electrodeless discharge lamp lighting device comprising a frequency control circuit that sweeps the operating frequency of the drive circuit from a start frequency to an end frequency so as to gradually increase the voltage generated in the induction coil at the start of the electrodeless discharge lamp In
With a turn-off detection circuit for detecting the turn-off of the electrodeless discharge lamp by detecting the output of the power conversion circuit,
An electrodeless discharge lamp lighting device, comprising: restarting means for setting the end frequency of the sweep by shifting it to a high frequency side by a predetermined value when the extinction is detected, and sweeping it again. 2. The electrodeless discharge lamp lighting device according to claim 1, wherein the restarting means sets the start frequency of the sweep by shifting it to a high frequency side by a certain value. 3. The electrodeless electrode according to claim 1, wherein the restarting unit repeats a constant value shift to the high frequency side of the end frequency or the start frequency in the sweep until the disappearance of the electrodeless discharge lamp is eliminated. Discharge lamp lighting device. The restarting means has storage means for storing the end frequency of the sweep when the extinction of the electrodeless discharge lamp is eliminated, and sets the end frequency of the subsequent sweep to the stored end frequency. The electrodeless discharge lamp lighting device according to any one of claims 1 to 3. An illumination fixture comprising: an electrodeless discharge lamp in which a discharge gas is sealed in a light-transmitting bulb; and the electrodeless discharge lamp lighting device according to any one of claims 1 to 4.

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