JP2005158462A - Electrodeless discharge lamp lighting device and electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp lighting device and an electrodeless discharge lamp device allowing the stable lighting of an electrodeless discharge lamp. <P>SOLUTION: This lighting device is provided with a power conversion circuit 7 and a control circuit 5. The power conversion circuit 7 is made up of a switching circuit 3 and a resonant circuit 4, and converts a DC output of a DC power supply 6 into a high-frequency output responsive to a driving frequency of the switching circuit 3. The control circuit 5 adjusts the magnitude of the high-frequency output supplied to an induction coil 2 by controlling the driving frequency of the switching circuit 3. The control circuit 5 changes the driving frequency within a predetermined range. The driving frequency is thereby prevented from reaching an abnormal value, and it is thus possible to achieve the stable lighting of the electrodeless discharge lamp 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp lighting device and an electrodeless discharge lamp device for supplying a high frequency output to an induction coil to light an electrodeless discharge lamp.

  Conventionally, an electrodeless discharge lamp lighting device for lighting an electrodeless discharge lamp has been provided. An electrodeless discharge lamp has a transparent spherical glass bulb or a glass bulb with an inner wall coated with a phosphor filled with a discharge gas composed of inert gas such as rare gas or metal vapor such as mercury vapor. The electrodeless discharge lamp lighting device generates a high-frequency electromagnetic field by causing a high-frequency current of several tens of kHz to several hundreds of MHz to flow through an induction coil disposed in the vicinity of the electrodeless discharge lamp. Is supplied with high frequency power to generate a high frequency plasma current in a glass bulb of an electrodeless discharge lamp to generate ultraviolet rays or visible light (see, for example, Patent Document 1 and Patent Document 2).

  An example of this type of electrodeless discharge lamp lighting device is shown in FIG. This conventional apparatus is arranged in the vicinity of the electrodeless discharge lamp 1 by converting a direct current output of the direct current power supply 6 into a high frequency output by producing a desired direct current output from an alternating current output of a commercial alternating current power supply AC. A power conversion circuit that supplies power to the induction coil 2 and a matching circuit M that performs impedance matching between the power conversion circuit and the induction coil 2 and efficiently supplies high-frequency power to the electrodeless discharge lamp 1 are provided.

  The DC power supply 6 includes a rectifier circuit 62 that rectifies the AC output of the AC power supply AC, and a well-known booster that includes an inductor L1, a diode D1, a switching element Q3, a smoothing capacitor C1, and a chopper driving circuit 61 that drives the switching element Q3. It consists of a chopper circuit.

  The power conversion circuit includes a switching circuit 3 including a pair of switching elements Q1 and Q2 connected in series between output terminals of the DC power supply 6 and a driving circuit 31 that alternately turns on and off the switching elements Q1 and Q2 at a driving frequency, and a low side And a series circuit of capacitors C4 and C5 connected between the drain and source of the switching element Q2. The drive circuit 31 is composed of, for example, a voltage controlled oscillator (VCO). The matching circuit M and the induction coil 2 are connected between the drain and source of the switching element Q2 via the primary winding of the current transformer CT and the capacitor C8. That is, the power conversion circuit is a so-called half-bridge type inverter circuit, and supplies a high frequency output to the induction coil 2 by alternately switching the switching elements Q1 and Q2.

  The matching circuit M includes a series circuit of capacitors C6 and C7 connected between the output ends of the power conversion circuit. The induction coil 2 is connected between both ends of one capacitor C7 of the matching circuit M.

The control circuit 5 detects the phase difference between the output voltage and output current of the power conversion circuit from the voltage at the connection point of the capacitors C4 and C5, and detects the output power from the output voltage and output current of the power conversion circuit. In addition, the drive circuit 31 is controlled according to the output power detection result and the chopper drive circuit 61 is controlled according to the phase difference of the output current of the power conversion circuit so that constant power is supplied to the dielectric coil 2. To do. For example, until the electrodeless discharge lamp 1 is lit, the chopper drive circuit 61 is controlled so that the output of the DC power source 6 is higher than the output when the electrodeless discharge lamp 1 is rated and the electrodeless discharge lamp 1 is lit. After that, the drive circuit 31 is controlled to keep the high frequency output of the power conversion circuit constant.
Japanese Patent Laid-Open No. 10-228989 (page 4-5, FIG. 1) Japanese Unexamined Patent Publication No. 2000-231996 (page 3-5, FIG. 1)

  In the above conventional example, a resonance circuit is configured by the primary winding of the current transformer CT, the capacitor C8, the matching circuit M, and the induction coil 2, and the control circuit 5 has a resonance frequency of the resonance circuit. The frequency at which the switching elements Q1 and Q2 of the drive circuit 31 are turned on and off (hereinafter referred to as “drive frequency”) is changed to increase or decrease the high-frequency output of the power conversion circuit. Normally, control is performed in a slow phase region where the drive frequency is higher than the resonance frequency.

  However, due to deterioration or damage of circuit components such as capacitors C4 and C5 that detect the high-frequency output of the power conversion circuit and the current transformer CT, or due to factors such as variations in characteristics of these circuit components and usage environment, If the high-frequency output cannot be detected accurately, the control circuit 5 may set the drive frequency to an abnormal value. For example, when the control circuit 5 excessively increases the drive frequency, the voltage across the dielectric coil 2 becomes too small, and the electrodeless discharge lamp 1 may flicker or disappear.

  Even if the high-frequency output of the power conversion circuit is accurately detected, the high-frequency output of the power conversion circuit can be used even if the drive frequency is the resonance frequency, depending on conditions such as variations in circuit component characteristics and usage environment. May not reach the target output. In such a case, the control circuit 5 makes the drive frequency lower than the resonance frequency, and operates in a phase advance region, so that the light emission of the electrodeless discharge lamp 1 is performed. Switching elements that constitute a circuit because efficiency decreases, control is difficult because the correlation between the driving frequency and the high-frequency output of the power conversion circuit is reversed, or the impedance of the resonance circuit becomes capacitive An excessive load may be applied to the elements such as Q1 and Q2.

  Particularly, since the impedance of the electrodeless discharge lamp 1 changes greatly immediately after lighting, the above-described abnormality is likely to occur.

  This invention is made | formed in view of the said reason, The objective is to provide the electrodeless discharge lamp lighting device and electrodeless discharge lamp apparatus which can light an electrodeless discharge lamp stably.

  According to the first aspect of the present invention, there is provided a power conversion means for converting a direct current input into a high frequency output having a magnitude corresponding to the driving frequency and supplying it to an induction coil disposed in the vicinity of the electrodeless discharge lamp, and a high frequency output of the power conversion means And a control means for adjusting the high frequency output supplied to the induction coil by changing the drive frequency according to the high frequency output detected by the output detection means. Is changed within a predetermined range.

  According to the above configuration, even if the output detection unit does not function normally, the control unit prevents the occurrence of abnormality due to the drive frequency being outside the predetermined range. The discharge lamp can be turned on.

  According to a second aspect of the present invention, in the first aspect of the present invention, the upper limit value of the predetermined range of the drive frequency is set to a minimum level necessary for the high frequency output of the power conversion means to keep the electrodeless discharge lamp on. It is characterized by the driving frequency when

  According to the above configuration, flickering or extinguishing of the electrodeless discharge lamp due to the control means abnormally reducing the high frequency output of the power conversion means is prevented.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the power conversion means is an inverter having a resonance circuit on the output end side and alternating a direct current input at a driving frequency, wherein the predetermined driving frequency is The lower limit value of the range is a resonance frequency of a resonance circuit including an induction coil in the resonance circuit of the power conversion means.

  According to the above configuration, it is possible to prevent the control from becoming difficult because the correlation between the drive frequency and the high frequency output of the power conversion means is reversed.

  According to a fourth aspect of the present invention, there is provided a power conversion means for converting a direct current input into a high frequency output having a magnitude corresponding to the driving frequency and supplying it to an induction coil disposed in the vicinity of the electrodeless discharge lamp, and a high frequency output of the power conversion means And a control means for adjusting the high frequency output supplied to the induction coil by changing the drive frequency according to the high frequency output detected by the output detection means. The high frequency output is not adjusted until a predetermined standby time elapses after the discharge lamp is turned on, and the high frequency output is adjusted after the standby time elapses.

  According to the above configuration, since the high frequency output is not adjusted immediately after lighting when the impedance change of the electrodeless discharge lamp is large, the control means operates when the impedance of the electrodeless discharge lamp is greatly different from that during steady lighting. Therefore, the electrodeless discharge lamp can be lit stably.

  According to a fifth aspect of the present invention, there is provided a power conversion means for converting a direct current input into a high frequency output having a magnitude corresponding to the driving frequency and supplying the high frequency output to an induction coil disposed in the vicinity of the electrodeless discharge lamp, and a high frequency output of the power conversion means Output detecting means for detecting the output, and control means for adjusting the high frequency output supplied to the induction coil to be close to a predetermined target output by changing the drive frequency according to the high frequency output detected by the output detecting means. The control means gradually reduces the target output from a value higher than the rated lighting value to a rated lighting value until a predetermined output reduction time elapses after the electrodeless discharge lamp lights. Features.

  According to the above configuration, it becomes possible to supply power that matches the characteristics of the electrodeless discharge lamp that requires relatively large power immediately after lighting, and flickering and extinction immediately after lighting of the electrodeless discharge lamp are prevented. The electrodeless discharge lamp can be lit stably. In addition, since the brightness of the electrodeless discharge lamp changes gradually, it is less likely to give the user a sense of discomfort than when the target output is reduced at once.

  According to a sixth aspect of the present invention, there is provided a power conversion means for converting a direct current input into a high frequency output having a magnitude corresponding to the driving frequency and supplying it to an induction coil disposed in the vicinity of the electrodeless discharge lamp, and a high frequency output of the power conversion means Output detecting means for detecting the output, and control means for adjusting the high frequency output supplied to the induction coil to be close to a predetermined target output by changing the drive frequency according to the high frequency output detected by the output detecting means. The control means maintains the target output at a value higher than the value at the time of rated lighting until the predetermined output decrease time elapses after the electrodeless discharge lamp is lit, and at the time when the output decrease time has elapsed. The target output is reduced to a value at rated lighting.

  According to the above configuration, it becomes possible to supply power that matches the characteristics of the electrodeless discharge lamp that requires relatively large power immediately after lighting, and flickering and extinction immediately after lighting of the electrodeless discharge lamp are prevented. The electrodeless discharge lamp can be lit stably.

  The invention of claim 7 is directed to an electrodeless discharge lamp lighting device according to any one of claims 1 to 6, an induction coil to which high frequency power is supplied from power conversion means of the electrodeless discharge lamp lighting device, And an electrodeless discharge lamp disposed in the vicinity of the induction coil.

  According to the above configuration, even if the output detection unit does not function normally, the control unit prevents the occurrence of abnormality due to the drive frequency being outside the predetermined range. The discharge lamp can be turned on.

  According to the present invention, the drive frequency for converting the direct current output of the direct current power source including the resonance circuit into the high frequency output is changed within a predetermined range, so that even if the output detection means does not operate normally, the control means Since the drive frequency is prevented from becoming an abnormal value, the electrodeless discharge lamp can be lit more stably.

  Hereinafter, the best mode for carrying out the present invention will be described.

(Embodiment 1)
As shown in FIG. 1, the present embodiment comprises a power conversion circuit 7 comprising a switching circuit 3 and a resonance circuit 4 for converting a DC output of a DC power supply 6 into a high-frequency output having a magnitude corresponding to the drive frequency, and an induction coil. 2 and a control circuit 5 that adjusts the magnitude of the high-frequency output supplied to the switching circuit 3 by controlling the driving frequency of the switching circuit 3. By limiting the range in which the control circuit 5 changes the driving frequency, the driving frequency is reduced. An abnormal value is prevented, and the electroless discharge lamp 1 is lit stably.

  A specific example of the circuit of this embodiment is shown in FIG. Since the DC power supply 6 and the switching circuit 3 are common to the conventional example, the same reference numerals are given and description thereof is omitted.

  The resonance circuit 4 includes a series circuit of an inductor Ls and a capacitor Cp connected between both ends of the low-side switching element Q2 of the switching circuit 3, and a capacitor Cs connected in series with the induction coil 2 between both ends of the capacitor Cp. Become. The power conversion circuit 7 is a so-called half-bridge type inverter circuit, and alternately switches a pair of switching elements Q1 and Q2 by a rectangular wave pulse drive signal output from the drive circuit 31 via the resonance circuit 4. Thus, a high frequency output is supplied to the induction coil 2.

  FIG. 3 shows the relationship between the frequency of the drive signal (hereinafter referred to as “drive frequency”) f and the voltage Vx across the induction coil 2 when the electrodeless discharge lamp 1 is lit. In the present embodiment, the drive frequency f is higher than the resonance frequency fr of the resonance circuit obtained by adding the induction coil 2 to the resonance circuit 4. Therefore, when the drive frequency f is lowered as shown in FIG. As it approaches, the voltage Vx across the induction coil 2 increases.

  A detection resistor R1 is connected to the source terminal of the switching element Q4. The voltage Vi across the detection resistor R1 is proportional to the high-frequency output of the power conversion circuit 7. That is, the detection resistor R1 is an output detection unit, and the high frequency output of the power conversion circuit 7 can be detected with a simple configuration. The control circuit 5 receives a voltage Vf corresponding to a voltage across the detection resistor R1 (hereinafter referred to as “detection voltage Vi”), and controls a drive frequency of the drive circuit 31 according to the input voltage Vf. Is provided. Further, the control circuit 5 includes an operational amplifier OP whose output terminal is connected to the frequency setting circuit 51. The detection voltage Vi is input to the inverting input terminal of the operational amplifier OP through the resistor R2, and the output voltage VDC of the DC power source 6 is divided by the resistors R4 and R5 (non-inverting input terminal). (Hereinafter referred to as “reference voltage”) Vref is input. A capacitor C3 is connected in parallel to the series circuit of the resistors R4 and R5. A parallel circuit of a resistor R3 and a capacitor C2 is connected between the inverting input terminal and the output terminal of the operational amplifier OP, and an error amplification circuit is configured by the resistors R2 and R3, the capacitor C2, and the operational amplifier OP. .

  Next, the operation of the control circuit 5 will be described. When the detection voltage Vi is smaller than the reference voltage Vref, that is, when the high-frequency output of the power conversion circuit 7 is small, the difference between the input voltage to the inverting input terminal and the reference voltage Vref is large, and the output voltage Vf of the operational amplifier OP is growing. The frequency setting circuit 51 lowers the frequency f of the drive signal of the drive circuit 31 when the input voltage Vf increases. As a result, the high frequency output of the power conversion circuit 7 is increased. When the detection voltage Vi is larger than the reference voltage Vref, that is, when the high-frequency output of the power conversion circuit 7 is large, the high-frequency output of the power conversion circuit 7 is reduced by the reverse operation to the above. Since the detection voltage Vi is proportional to the high frequency output of the power conversion circuit 7, the control circuit 5 feeds back the high frequency output of the power conversion circuit 7 to an output corresponding to the reference voltage Vref (hereinafter referred to as “target output”). Will do. In addition, the magnitude | size of the reference voltage Vref is set to the magnitude | size corresponding to the magnitude | size of the high frequency output of the power converter circuit 7 of the extent required in order to carry out the rated lighting of the electrodeless discharge lamp 1. FIG.

  An example of the time change of the high frequency output P of the power conversion circuit 7 after the electrodeless discharge lamp 1 is turned on is shown in FIG. 4A, and an example of the time change of the drive frequency f is shown in FIG. In the frequency setting circuit 51, the detection resistor R1 and the operational amplifier OP do not function normally due to factors such as variation in characteristics of each product and the usage environment, and the state where the input voltage Vf is low continues in FIG. Even if the elapsed time t after the lighting of the lamp is from t1 to t2), the drive frequency f is not increased above the constant frequency fl, and the drive frequency f is kept at the constant value fl. It is like that. The upper limit frequency fl is a level Vl that is the minimum necessary for the voltage Vx across the induction coil 2 to keep the electrodeless discharge lamp 1 lit while the impedance of the electrodeless discharge lamp 1 is stable after lighting. That is, the driving frequency f when the high-frequency output P of the power conversion circuit 7 is at least as large as necessary to keep the electrodeless discharge lamp 1 lit.

  According to this configuration, even if the detection resistor R1 and the operational amplifier OP do not function normally, the drive frequency f does not exceed the predetermined value fl, and therefore the high frequency output P of the power conversion circuit 7 becomes too small. It is possible to prevent the occurrence of light extinction and to turn on the electrodeless discharge lamp stably.

  Furthermore, as shown in FIG. 5, when the state where the input voltage Vf is high continues (in FIG. 5, the elapsed time t after the electrodeless discharge lamp is turned on from t3 to t4). Alternatively, the frequency setting circuit 51 may keep the driving frequency f at a constant value fr without lowering the driving frequency f below the resonance frequency fr.

  According to this configuration, even when the detection resistor R1 and the operational amplifier OP do not function normally, or even when the drive frequency f is set to the resonance frequency fr, the high-frequency output P of the power conversion circuit 7 does not reach the target output. Since the drive frequency f is never smaller than the resonance frequency fr, the operation is not performed in the phase advance region, and the control is performed by reversing the positive / negative correlation between the drive frequency f and the high-frequency output P of the power conversion circuit 7. Since the impedance of the resonance circuit including the induction coil 2 becomes capacitive and an excessive load is not applied to the circuit components, the electrodeless discharge lamp 1 can be lit stably. it can.

  In particular, in an electrodeless discharge lamp apparatus in which the induction coil 2 is wound around a core housed in a recess provided in the electrodeless discharge lamp 1, for example, the Q of the resonance circuit including the induction coil 2 is increased and the drive frequency f is increased. Since the change of the high frequency output P of the power conversion circuit 7 with respect to the change tends to increase, the effect of the application of the present invention is particularly great.

  As a method for detecting the high-frequency output P of the power conversion circuit 7, the voltage Vx across the induction coil 2 may be used instead of using the drain current of the switching element Q2 detected by the detection resistor R1. Specifically, instead of providing the detection resistor R1, as shown in FIG. 6, the voltage Vx across the induction coil 2 is divided by resistors R6 and R7 and used as the detection voltage Vi. In this case, the resistors R6 and R7 serve as output detection means. According to this configuration, since the voltage Vx across the induction coil 2 is high in voltage and easy to smooth, the accuracy of detecting the high-frequency output P can be further improved. Alternatively, a secondary winding may be provided in the inductor Ls, and the high frequency output P of the power conversion circuit 7 may be detected based on the current of the secondary winding. Alternatively, a plurality of output detection means may be provided to improve output detection accuracy.

  Further, as the reference voltage Vref, instead of directly using the output of the DC power supply 6 as shown in FIG. 2, the output of the second power supply circuit 63 that stabilizes the output of the DC power supply 6 as shown in FIG. 6 may be used. .

(Embodiment 2)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, illustration and description thereof are omitted, and only different portions are described.

  In the present embodiment, as shown in FIG. 7, the frequency setting circuit 51 does not adjust the high-frequency output P of the power conversion circuit 7 until a predetermined standby time t <b> 5 elapses from the lighting of the electrodeless discharge lamp 1. The drive frequency f is maintained at a constant value. The standby time t5 is, for example, a time from when the electrodeless discharge lamp 1 is turned on until the high-frequency output of the power conversion circuit 7 is substantially stabilized. Other configurations are the same as those in the first embodiment.

  According to this configuration, the high-frequency output P is not adjusted during a period when the high-frequency output P of the power conversion circuit 7 is not stabilized due to the impedance change of the electrodeless discharge lamp 1. Since P does not become unnecessarily small or does not operate in the phase advance region, occurrence of abnormalities such as the turn-off of the electrodeless discharge lamp 1 is prevented, and the electrodeless discharge lamp 1 can be lit stably. Can do.

  Instead of setting the timing of starting the adjustment of the high-frequency output P as the time when the standby time t5 has elapsed, a detection means for detecting that the high-frequency output P of the power conversion circuit 7 is stable is provided, and the high-frequency output of the power conversion circuit 7 is provided. The frequency setting circuit 51 may start adjusting the high-frequency output P when the detection means detects that P is stable.

(Embodiment 3)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, illustration and description thereof are omitted, and only different portions are described.

  In the present embodiment, as shown in FIG. 8, the frequency setting circuit 51 has a constant output that is slightly higher than the value P1 at the time of rated lighting until the predetermined time t6 has elapsed since the lighting of the electrodeless discharge lamp 1. The target output is reduced to the value P1 at the time of rated lighting when the predetermined output reduction time t6 elapses. The output decrease time t6 is, for example, a time from when the electrodeless discharge lamp 1 is turned on until the high-frequency output of the power conversion circuit 7 is substantially stabilized. In order to make the target output variable, for example, the resistance values of the resistors R4 and R5 that divide the output voltage VDC of the DC power supply 6 may be made variable, and the resistance value may be switched by the output of a timer circuit or the like. Other configurations are the same as those in the first embodiment.

  According to the above configuration, it is possible to supply the high-frequency output P that matches the characteristics of the electrodeless discharge lamp 1 that requires a large high-frequency output P immediately after lighting, and prevent flickering or extinction immediately after the electrodeless discharge lamp 1 is turned on. Therefore, the electrodeless discharge lamp 1 can be lit stably.

  Instead of setting the time when the target output is reduced as the elapsed time of the output reduction time t6, detection means for detecting that the high-frequency output P of the power conversion circuit 7 is stable is provided, and the high-frequency output P of the power conversion circuit 7 is The target output may be reduced when the detection means detects that it is stable.

(Embodiment 4)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, illustration and description thereof are omitted, and only different portions are described.

  In the present embodiment, as shown in FIG. 9, the frequency setting circuit 51 sets the target output to a value slightly higher than the value P1 at the rated lighting immediately after the electrodeless discharge lamp 1 is turned on, and then a predetermined output decreasing time. It is characterized in that the target output is continuously lowered to the value P1 at the time of rated lighting with the high frequency output P of the power conversion circuit 7 over t7. In order to make the target output variable, for example, as described in the third embodiment, the resistance values of the resistors R4 and R5 for dividing the output voltage VDC of the DC power supply 6 are made variable, and the resistance value is adjusted by the output of the timer circuit or the like. What is necessary is just to make it the structure which does. Other configurations are the same as those in the first embodiment.

  According to this configuration, it is possible to supply a high-frequency output that matches the characteristics of the electrodeless discharge lamp 1 that requires a large high-frequency output immediately after lighting, and flickering or extinguishing immediately after the electrodeless discharge lamp 1 is turned on is prevented. Thus, the electrodeless discharge lamp 1 can be stably lit.

  Moreover, since the change in the brightness of the electrodeless discharge lamp 1 becomes moderate as compared with the case where the target output is lowered all at once as in the third embodiment, there is an advantage that it is difficult for the user to feel uncomfortable.

It is a block diagram which shows Embodiment 1 of this invention. It is a circuit diagram which shows the specific example of a circuit same as the above. It is explanatory drawing which shows the relationship between the both-ends voltage of the induction coil at the time of lighting of an electrodeless discharge lamp, and a drive frequency in the same as the above. It is operation | movement explanatory drawing same as the above, (a) shows the time change of the high frequency output of a power converter circuit, (b) shows the time change of a drive frequency. It is operation | movement explanatory drawing which shows another form same as the above, (a) shows the time change of the high frequency output of a power converter circuit, (b) shows the time change of a drive frequency. It is a circuit diagram which shows another specific example of a circuit same as the above. It is operation | movement explanatory drawing which shows the time change of the high frequency output of the power converter circuit in Embodiment 2 of this invention. It is operation | movement explanatory drawing which shows the time change of the high frequency output of the power converter circuit in Embodiment 3 of this invention. It is operation | movement explanatory drawing which shows the time change of the high frequency output of the power converter circuit in Embodiment 4 of this invention. It is a circuit diagram which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrodeless discharge lamp 2 Induction coil 4 Resonance circuit 5 Control circuit 6 DC power supply 7 Power conversion circuit R1 Resistance for detection

Claims (7)

  Power conversion means for converting a DC input into a high-frequency output having a magnitude corresponding to the driving frequency and supplying the high-frequency output to an induction coil disposed in the vicinity of the electrodeless discharge lamp; and an output detection means for detecting the high-frequency output of the power conversion means; And a control means for adjusting the high frequency output supplied to the induction coil by changing the drive frequency in accordance with the high frequency output detected by the output detection means, and the control means changes the drive frequency within a predetermined range. An electrodeless discharge lamp lighting device.   The upper limit value of the predetermined range of the drive frequency is set to a drive frequency when the high frequency output of the power conversion means becomes a magnitude that is at least necessary to keep the electrodeless discharge lamp on. Item 2. The electrodeless discharge lamp lighting device according to Item 1.   The power conversion means is an inverter that has a resonance circuit on the output end side and alternates DC input at the drive frequency, and includes a lower limit value of the predetermined range of the drive frequency and includes an induction coil in the resonance circuit of the power conversion means 3. The electrodeless discharge lamp lighting device according to claim 1, wherein the resonance frequency of the resonance circuit is used.   Power conversion means for converting a DC input into a high-frequency output having a magnitude corresponding to the driving frequency and supplying the high-frequency output to an induction coil disposed in the vicinity of the electrodeless discharge lamp; and output detection means for detecting the high-frequency output of the power conversion means; And a control means for adjusting the high-frequency output supplied to the induction coil by changing the drive frequency according to the high-frequency output detected by the output detection means, the control means after the electrodeless discharge lamp is lit The electrodeless discharge lamp lighting device, wherein the high frequency output is not adjusted until a predetermined standby time elapses, and the high frequency output is adjusted after the standby time elapses.   Power conversion means for converting a DC input into a high-frequency output having a magnitude corresponding to the driving frequency and supplying the high-frequency output to an induction coil disposed in the vicinity of the electrodeless discharge lamp; and an output detection means for detecting the high-frequency output of the power conversion means; And a control means for adjusting the high frequency output supplied to the induction coil to approach a predetermined target output by changing the drive frequency according to the high frequency output detected by the output detection means. The electrodeless discharge lamp is characterized in that the target output is gradually decreased from a value higher than the rated lighting value to a value at the rated lighting time until a predetermined output reduction time elapses after the electrode discharge lamp is turned on. Lighting device.   Power conversion means for converting a DC input into a high-frequency output having a magnitude corresponding to the driving frequency and supplying the high-frequency output to an induction coil disposed in the vicinity of the electrodeless discharge lamp; and an output detection means for detecting the high-frequency output of the power conversion means; And a control means for adjusting the high frequency output supplied to the induction coil to approach a predetermined target output by changing the drive frequency according to the high frequency output detected by the output detection means. The target output is maintained at a value higher than the rated lighting value until the specified output reduction time elapses after the electrode discharge lamp illuminates. The electrodeless discharge lamp lighting device is characterized by being reduced to a value.   An electrodeless discharge lamp lighting device according to any one of claims 1 to 6, an induction coil to which high-frequency power is supplied from power conversion means of the electrodeless discharge lamp lighting device, and a proximity of the induction coil. An electrodeless discharge lamp device comprising: an electrodeless discharge lamp.

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