JPH07272875A - Power source device, electrodeless discharge lamp lighting device, and lighting system - Google Patents

Abstract

PURPOSE:To facilitate design of an electrodeless discharge lamp and also reduce the cost by surely making high frequency electric power supplied to the electrodeless discharge lamp have prescribed electric power and be constant. CONSTITUTION:High frequency electric power based on a switching signal is supplied to an excitating coil 36 through a matching circuit 35 from a high frequency electric power output circuit 34 to light an electrodeless discharge lamp 37. At that time, voltage drop by the divided voltage of resistors R1 and R2 and a resistor Ri is multiplied by a multiplication circuit 41, and a resultant value is compared with a preset reference value VE by a comparator 42 to control D.C. voltage Vh into prescribed voltage and constant based on a compared value signal showing the value of a resultant difference to perform the constant electric power control for high frequency electric power supplied to the electrodeless discharge lamp 37 from the excitating coil 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, an electrodeless discharge lamp lighting device, and a lighting device for supplying a specified high frequency power to an electrodeless discharge lamp and for controlling a constant high frequency power to be supplied.

[0002]

2. Description of the Related Art Conventionally, an electrodeless discharge lamp lighting device for performing discharge lighting with high frequency power from an excitation coil detects high frequency power and, based on the detected value, supplies predetermined high frequency power to the electrodeless discharge lamp. It is controlled to supply a constant high frequency power.

FIG. 30 is a block diagram showing a schematic structure of a conventional electrodeless discharge lamp lighting device for performing constant control of high frequency power. In FIG. 30, in this example, the AC voltage from the AC power source 2 is converted into a direct current by the direct current circuit 3. DC from here
The voltage is converted into a desired voltage value by the DC / DC converter 4, and the DC voltage is supplied to the high frequency power output circuit 5. From the high frequency power output circuit 5, for example, the frequency 13.
High frequency power of 56 MHz is supplied to the electrodeless discharge lamp 8 through the matching circuit 6 and the excitation coil 7.

In the DC / DC converter 4, a switching signal (PW) from the pulse width modulation (PWM) circuit 13 is sent to a switching element such as an FET (not shown) in this circuit.
M signal) is supplied through the drive circuit 14 to generate an AC high voltage based on the switching signal. A pickup coil 11 for detecting an amount corresponding to the high frequency power (magnetic field) from the excitation coil 7 is provided near the excitation coil 7, and a high frequency signal induced therein is detected by a detection circuit 12 such as a detector. Then, the PWM signal from the PWM circuit 13 is changed based on the detected voltage level. The switching voltage in the DC / DC converter 4 changes based on this PWM signal.

In this way, the closed loop control is performed in which the high frequency power from the excitation coil 7 is kept at a predetermined power. In this case, in order to supply a predetermined high frequency power to the electrodeless discharge lamp 8 and to make it constant, the inductance of the matching circuit 6, for example, the inductance of the coil and the capacitance of the capacitor are adjusted during manufacturing. Also, the frequency (PWM) adjustment of the drive signal, the amplitude adjustment of the drive signal, the power supply voltage of the high frequency power output circuit 5, and the like are performed.

Further, such an electrodeless discharge lamp lighting device is provided with a starting voltage generating circuit for applying a high voltage at the time of starting in order to facilitate lighting of the electrodeless discharge lamp.

FIG. 31 is a circuit diagram showing a main configuration of an electrodeless discharge lamp lighting device provided with a starting voltage generating circuit. 31, in this example, the high frequency power from the high frequency power output circuit (not shown) is output to the excitation coil 21 through the matching circuit 20. The matching circuit 20 has a series (resonance) capacitor CV and a capacitor CP connected in parallel to the excitation coil 21, and this capacitor CV,
Resonance is caused by the CP and the inductance of the excitation coil 21, and the high frequency power due to this resonance is supplied to the electrodeless discharge lamp 22 coupled to the excitation coil 21 by the distributed capacitance. In this case, at the time of starting the electrodeless discharge lamp 22, a high voltage is applied to the starting probe through the starting voltage generating circuit 23.

The starting voltage generating circuit 23 is the matching circuit 2
The high frequency power from 0 is supplied to the series resonance circuit of the capacitor Cs and the coil Ls. The high voltage Q times due to this resonance is generated by the electrodeless starting probe 2
2 is applied to start lighting. In this case, the resonance characteristic (skirt characteristic) of the series resonance circuit is set to a predetermined value by a dump resistor connected in parallel with the coil Ls so that the starting and lighting thereof can be easily performed.

[0009]

In the above-mentioned conventional example, the former electrodeless discharge lamp lighting device shown in FIG. 30 detects the high-frequency power and makes the power constant at the predetermined level. Various adjustments are necessary. In this case, the Q (voltage expansion rate) of the matching circuit 6 and the resonance circuit of the excitation coil 7 is extremely high, for example, "30", and fine adjustment of the frequency or the like is required, and setting thereof is troublesome. Further, it is necessary to set constants in consideration of changes in resonance frequency due to a metal body approaching the matching circuit 6 and the excitation coil 7. That is, there is a drawback that a circuit design with complicated parameters is required, the design is difficult, and the cost is increased.

In the latter electrodeless discharge lamp lighting device shown in FIG. 31, the high frequency power supplied to the starting probe,
The high frequency power branched from the matching circuit 20 has the same phase. In other words, there is a drawback in that it is difficult to start more reliably because the starting probe is started only by the voltage of the high frequency power supplied to the starting probe.

The present invention solves the above-mentioned drawbacks in the prior art, and controls the DC voltage applied to the high-frequency power output circuit to a predetermined voltage and keeps it constant, thereby providing high-frequency power to the electrodeless discharge lamp. It is an object of the present invention to provide a power supply device, an electrodeless discharge lamp lighting device, and a lighting device, which can reliably set and maintain a predetermined electric power, facilitate the design thereof, and reduce the cost.

[0012]

In order to achieve the above object, the invention according to claim 1 is a power supply device for supplying a high frequency power for lighting an electrodeless discharge lamp from an excitation coil, wherein a DC voltage is supplied. DC voltage varying means for varying and outputting,
High-frequency power output means for outputting high-frequency power by applying the direct-current voltage from the direct-current voltage varying means, voltage detection means for detecting the direct-current voltage applied to the high-frequency power output means, and current flowing through the high-frequency power output means Current detecting means, a multiplying means for obtaining a multiplied value of a voltage value detected by the voltage detecting means and a current value detected by the current detecting means, and a DC voltage based on the multiplying value, by controlling the DC voltage varying means, A constant power control means for controlling the high frequency power applied to the high frequency power output means to make the high frequency power output from the high frequency power output means constant.

According to a second aspect of the present invention, there is provided a power supply device for supplying a high frequency power for lighting an electrodeless discharge lamp from an excitation coil, the direct current voltage varying means for varying and outputting the direct current voltage, and the direct current voltage. High frequency power output means for outputting high frequency power by applying the DC voltage from the variable means, voltage detection means for detecting the DC voltage applied to the high frequency power output means, and current for detecting the current flowing through the high frequency power output means Detecting means, adding means for adding the voltage value detected by the voltage detecting means and the current value detected by the current detecting means, and a DC voltage based on the added value, by controlling the DC voltage varying means,
And a power control means for controlling the high frequency power output from the high frequency power output means to be constant.

According to a third aspect of the present invention, there is provided a power supply device for supplying high-frequency power for lighting an electrodeless discharge lamp from an excitation coil, the direct-current voltage varying means for varying and outputting the direct-current voltage, and the direct-current voltage. High frequency power output means for outputting high frequency power by applying the DC voltage from the variable means, voltage detection means for detecting the DC voltage applied to the high frequency power output means, and current for detecting the current flowing through the high frequency power output means Detecting means, multiplying means for obtaining a multiplied value of the voltage value detected by the voltage detecting means and the current value detected by the current detecting means, and a DC voltage based on the multiplying value, by controlling the DC voltage varying means to generate high frequency power. Constant power control means for controlling the high-frequency power output from the high-frequency power output means to be constant, which is applied to the output means, and DC voltage varying means when the voltage detection means detects an overvoltage. Controlled to a structure and a overvoltage control means for controlling to prevent output overvoltage.

According to a fourth aspect of the present invention, there is provided a power supply device for supplying a high frequency power for lighting an electrodeless discharge lamp from an excitation coil, the direct current voltage varying means for varying and outputting the direct current voltage, and the direct current voltage. High frequency power output means for outputting high frequency power by applying the DC voltage from the variable means, voltage detection means for detecting the DC voltage applied to the high frequency power output means, and current for detecting the current flowing through the high frequency power output means Detecting means, adding means for adding the voltage value detected by the voltage detecting means and the current value detected by the current detecting means, and a DC voltage based on the added value, by controlling the DC voltage varying means,
The power control means for controlling the high frequency power applied to the high frequency power output means to make the high frequency power output from the high frequency power output means constant, and the direct current voltage varying means for controlling the DC voltage varying means when the voltage detecting means detects the overvoltage. It is configured to include an overvoltage control unit that performs control for blocking output.

According to a fifth aspect of the power supply device of the present invention, the voltage detecting means has a first resistor connected in series for performing voltage detection for dividing the direct current voltage from the direct current voltage varying means to perform power control, and a direct current. A second resistor connected in series for dividing the DC voltage from the voltage varying means to detect an overvoltage.

According to a sixth aspect of the present invention, as the current detecting means, a resistor through which a current flowing through the high frequency power output means flows is used, and a voltage value due to a voltage drop in the resistor is detected as a current value. I am trying.

According to a seventh aspect of the power supply device of the present invention, the constant power control means is provided with an error amplifier for comparing the multiplication value with a preset reference value, and the direct current voltage based on the comparison value from the error amplifier is converted into a direct current. The voltage varying means outputs the data.

According to another aspect of the power supply device of the present invention, the power control means is provided with an error amplifier for comparing the added value with a preset reference value, and the DC voltage based on the comparison value from the error amplifier is changed to the DC voltage. The variable means outputs the data.

According to another aspect of the power supply apparatus of the present invention, the overvoltage control means is provided with an error amplifier for comparing the divided voltage at the second resistor with a preset reference value. The direct-current voltage based on this is output by the direct-current voltage varying means.

An electrodeless discharge lamp lighting device according to a tenth aspect of the present invention is the power supply device according to any one of the first to ninth aspects, further comprising an electrodeless discharge lamp that is turned on by the high frequency power from the excitation coil. It is configured.

According to an eleventh aspect of the present invention, in the structure of the electrodeless discharge lamp lighting device according to the tenth aspect, at least a casing for accommodating the power supply device and a reflection means for reflecting the light emitted from the electrodeless discharge lamp are provided. It is a composition.

[0023]

In this structure, the power supply device according to claims 1, 3, 5 and 9 detects the DC voltage applied to the high-frequency power output means and the current value, and changes the value based on the multiplied value. The DC voltage is applied to the high frequency power output means by controlling the DC voltage varying means. At the same time, when the overvoltage is detected, the DC voltage varying means is controlled to prevent the output of the overvoltage. Therefore, the constant power control for stabilizing the high frequency power from the high frequency power output means is performed, and the high frequency power to the electrodeless discharge lamp is reliably set to the predetermined power and constant.

The power supply device according to claims 2, 4 to 9 detects the DC voltage applied to the high frequency power output means and the current value, and outputs the DC voltage based on the added value to the DC voltage varying means. It is controlled and applied to the high frequency power output means. At the same time, when the overvoltage is detected, the DC voltage varying means is controlled to prevent the output of the overvoltage. Therefore, an approximate constant power control for stabilizing the high frequency power from the high frequency power output means using the added value of the detected voltage value and current value is performed, the signal processing is simplified, and the electrodeless discharge is performed. The high frequency power to the lamp is reliably set to the predetermined power and made constant.

According to a tenth aspect of the present invention, there is provided an electrodeless discharge lamp lighting device in which the above-mentioned power supply device is provided with an electrodeless discharge lamp which is lit by the high frequency power from the excitation coil. The constant power control and the control for preventing overvoltage are performed, and the high frequency power to the electrodeless discharge lamp is reliably set to a predetermined power and made constant.

According to an eleventh aspect of the present invention, in the constitution of the electrodeless discharge lamp lighting device according to the tenth aspect, at least a casing for accommodating the power supply device and a reflecting means for reflecting the light emitted from the electrodeless discharge lamp are provided. The constant power control or approximate constant power control is performed similarly to the electrodeless discharge lamp lighting device, and control for preventing overvoltage is performed, and the high frequency power to the electrodeless discharge lamp is set to a predetermined power reliably. It is stabilized.

[0027]

Embodiments of the power supply device, the electrodeless discharge lamp lighting device and the lighting device of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the electrodeless discharge lamp lighting device of the present invention.
3 is a circuit diagram showing the configuration of the embodiment of FIG. In FIG. 1, the electrodeless discharge lamp lighting device performs constant power control, and includes an AC power source 31 such as a commercial AC power source, a bridge rectifier 32 that rectifies AC from the AC power source 31, and a DC voltage. A smoothing electrolytic capacitor C1 for obtaining and a DC / DC converter 33 that rectifies the direct current voltage from the smoothing electrolytic capacitor C1 into a high voltage alternating current and then outputs the direct current voltage Vh are provided. There is.

Further, the electrodeless discharge lamp lighting device includes:
A high-frequency power output circuit 34 that is supplied with a direct-current voltage from the DC / DC converter 33 and outputs high-frequency power having a frequency of 13.56 MHz, and a high-frequency power output circuit 3
A matching circuit 35 for matching the impedance of the high-frequency power from the circuit 4 and outputting the same;
5, the excitation coil 36 to which the high frequency power is supplied, the electrodeless discharge lamp 37 which is coupled to the excitation coil 36 by the induction magnetic field and is supplied with the high frequency power, and the DC voltage Vh are kept constant at a predetermined voltage value. And a voltage control unit 38 for controlling the operation.

Further, this electrodeless discharge lamp lighting device has a D
The C / DC converter 33 is connected to the transformer T1 to which the DC voltage from the smoothing electrolytic capacitor C1 is supplied to one end of the primary coil, and is connected to the other end of the primary coil of the transformer T1 and is turned on / off by a switching signal. Field effect transistor (FET) Q1 for generating alternating current
A rectifier D1 for rectifying the AC voltage derived from the secondary coil of the transformer T1, and a smoothing electrolytic capacitor C2
And are provided.

The high frequency power output circuit 34 is applied with the DC voltage Vh from the DC / DC converter 33.
FETs Q2 and Q3 connected in series for outputting high frequency power of frequency 13.56 MHZ, and input coils L1, which are respectively provided at the gates of these FETs Q2 and Q3 and to which switching signals for obtaining high frequency power of frequency 13.56 MHZ are supplied. L2, a switching signal generator 39 for supplying a switching signal to the primary side coils of the input coils L1 and L2, and a high frequency bypass capacitor C3 connected between the application line of the DC voltage Vh and the ground are provided. There is.

The matching circuit 35 is connected in parallel with the direct-current cutting capacitor C4 connected to the output end of the high-frequency power output circuit 34 and the excitation coil 36, and the capacitance value of the capacitor C4 and the excitation coil 36. A capacitor C5 for resonating at a frequency of 13.56 MHz is provided by the inductance.

The voltage control unit 38 divides the DC voltage Vh into resistors R1 and R2, and a resistor Ri having a small resistance value that detects a current flowing through the high frequency power output circuit 34 as a drop voltage.
And a multiplication circuit 41 for obtaining a value obtained by multiplying the divided voltage of the resistors R1 and R2 and the voltage drop due to the resistor Ri, and the value from the multiplication circuit 41 is a preset reference value (threshold value) V.
And a comparator 42 that outputs a comparison value signal indicating the difference value of E. Further, the voltage control unit 38 outputs a PWM signal based on the comparison value signal from the comparator 42, and a PWM signal from the PWM circuit 43 to the FET in the DC / DC converter 33.
A drive circuit 44 for generating and outputting a switching signal Sa for driving Q1 is provided.

Next, the operation of the first embodiment will be described. In the DC / DC converter 33, the DC voltage from the bridge rectifier 32 and the smoothing electrolytic capacitor C1 is applied to the FET Q1 through the primary coil of the transformer T1. The FET Q1 performs a switching operation according to the frequency of the switching signal Sa from the DC / DC converter 33, and the AC voltage of that level is derived from the secondary coil of the transformer T1.

The AC voltage from the secondary coil is rectified by the rectifier D1.
The DC voltage Vh is applied to the high frequency power output circuit 34 by converting the DC voltage Vh into a DC voltage by the smoothing electrolytic capacitor C2.
In the high frequency power output circuit 34, the FETs Q1 and Q2 are turned on / off by the switching signal from the switching signal generator 39, and the frequency is 13.56 from the output end.
Outputs high frequency power of MHZ. This high frequency power is supplied to the excitation coil 36 through the matching circuit 35. High-frequency power is supplied from the excitation coil 36 to the electrodeless discharge lamp 37 by electromagnetic coupling (distributed capacitance).

In this case, since the predetermined and constant high frequency power is supplied to the electrodeless discharge lamp 37, the DC voltage Vh is controlled to the predetermined voltage and constant by the voltage controller 38.
In this control, first, the DC voltage Vh is divided and detected by the resistors R1 and R2, and further, the current flowing through the high frequency power output circuit 34 is detected from the voltage dropped by the resistor Ri. A value obtained by multiplying the divided voltage of the resistors R1 and R2 and the dropped voltage of the resistor Ri by the multiplication circuit 41 is obtained. That is, a value for performing constant power control is obtained.

The comparator 42 compares the value from the multiplication circuit 41 with a preset reference value (threshold value) VE and outputs a comparison value signal indicating the difference value. Reference value VE in this case
Is a threshold value for controlling the DC voltage Vh to be a predetermined voltage and constant. When the comparison value signal is lower than the reference value VE, the control is performed to increase the DC voltage Vh, and the comparison is made from the reference value VE. When the value signal is high, control is performed to lower the DC voltage Vh. That is, the comparison value signal is supplied to the PWM circuit 43, and the PWM based on the comparison value signal is supplied.
A signal is generated and supplied to the drive circuit 44, the switching signal Sa is supplied from the drive circuit 44 to the gate of the FET Q1 in the DC / DC converter 33, and the FET Q1 is turned on based on the frequency (pulse width) of the switching signal Sa. The switching operation is performed, and the AC voltage of that level is derived from the secondary coil of the transformer T1.

In this way, in the first embodiment, control for keeping the DC voltage Vh constant and constant based on the divided voltage of the DC voltage Vh and the current flowing through the high frequency power output circuit 34 (closed loop control). Is done. In this case, the constant power control is performed by the detection voltage and the detection current, and the high frequency power is not detected and the power stabilization control is not performed as described above, so that various troublesome adjustments are unnecessary.

FIG. 2 is a circuit diagram showing the configuration of the main part when performing approximate constant power control according to the second embodiment. In FIG. 2, this example uses an adding circuit 45 in place of the multiplying circuit 41 in the voltage control unit 38 in the first embodiment shown in FIG. Other configurations are the same as those in FIG.

Next, the operation of the second embodiment will be described. The DC voltage Vh is divided and detected by the resistors R1 and R2, and the current flowing through the high frequency power output circuit 34 is detected from the voltage dropped by the resistor Ri. A value obtained by adding the divided voltage of the resistors R1 and R2 and the voltage dropped by the resistor Ri in the adding circuit 45 is obtained. With this added value, power control similar to the constant power control described in the first embodiment is performed. Other operations are similar to those of the first embodiment shown in FIG.

In the configuration of the adder circuit 45 used in the second embodiment, for example, the divided voltage and the dropped voltage are applied to one end of each of the two resistors and the other end is connected. Alternatively, a simple structure in which the diode is composed of two diodes, the divided voltage and the dropped voltage are applied to the respective anodes, and the cathodes are connected is sufficient, and the structure is simplified as compared with the multiplication circuit 41 shown in FIG. .

FIG. 3 is a circuit diagram showing the configuration of the main part for performing constant power control and overvoltage control according to the third embodiment. 3, this example has the same configuration as that of the voltage controller 38 shown in FIG. 1, namely, resistors R1 and R2, resistors Ri, a multiplication circuit 41, a comparator 42, a PWM circuit 43, and a drive circuit 44. have.

Further, an overvoltage of the DC voltage Vh, for example,
Control is performed to prevent the DC voltage Vh from becoming an overvoltage when there is no load such as when the electrodeless discharge lamp 37 is defective or removed. This control section divides the DC voltage Vh into resistors R4 and R5 that detect the divided voltage, a comparator 47 that compares the divided voltage with a reference value VEa, and a comparator 42 or a comparison value signal from the comparator 47. It has a connector 48 composed of diodes D3 and D4 for outputting one to the PWM circuit 43.

The reference value VEa set in the comparator 47 is a voltage value higher than the reference value VE set in the comparator 42. That is, the DC voltage Vh is set to the voltage value immediately before it becomes an overvoltage. Further, the reference value VE is set to a voltage value for controlling the direct-current voltage Vh in the normal state in which the overvoltage does not become a predetermined voltage and constant.

The operation of the third embodiment will be described. During normal control in which the DC voltage Vh is kept constant at a predetermined voltage, the voltage controller 38 shown in FIG. 1 operates. That is, the closed loop control for controlling the DC voltage Vh is performed based on the divided voltage of the DC voltage Vh and the current flowing through the high frequency power output circuit 34.

Next, in the control at the time of overvoltage of the DC voltage Vh, the voltage obtained by dividing the DC voltage Vh by the resistors R4 and R5 and the reference value VEa are compared by the comparator 47, and the DC voltage Vh is compared.
Becomes an overvoltage and the divided voltage exceeds the reference value VEa, the comparator 47 supplies a comparison value signal to the PWM circuit 43, and further, the drive circuit 44 supplies the switching signal Sa to the FET Q1. In this case, the switching signal S
A switching operation is performed according to the frequency (pulse width) of a, and an AC voltage of that level is derived from the secondary coil of the transformer T1. However, since the overvoltage of the DC voltage Vh is controlled, the voltage is greatly reduced. Is done.

As described above, in the third embodiment, in addition to the closed loop control in which the DC voltage Vh in the normal state is fixed and fixed,
Closed loop control is performed to prevent an overvoltage, for example, an overvoltage of the DC voltage Vh when there is no load such as a defect or removal of the electrodeless discharge lamp 37.

FIG. 4 is a circuit diagram showing a main structure of a matching circuit according to the fourth embodiment. In FIG. 4, this matching circuit 35 is different from the matching circuit 35 of the first embodiment shown in FIG. 1 in that it has a capacitor C4 for DC cutting and a capacitor C5 connected in parallel to the excitation coil 36. Between the high frequency output side of C4 and ground, that is, the coil L3 (inductive reactance element Y3) connected in parallel to the high frequency power output circuit 34 (high frequency power output power source), and the capacitor C8 (capacitance connected in parallel to the excitation coil 36. Reactive reactance element Y1) and coil L
Capacitor C7 connected between 3 and capacitor C8
(Capacitive reactance element X1).

Conventionally, the no-load secondary voltage in the voltage induced by the high frequency power supplied to the electrodeless discharge lamp 37 is as small as 1.2 times, for example, and the lighting stop occurs when the arc state changes. Although easy, in the fourth embodiment, the operating point of the high-frequency power output circuit 34 is optimized, and the no-load secondary voltage in the voltage induced by the high-frequency power supplied to the electrodeless discharge lamp 37 is increased. Further, since the phase of the high frequency power from the high frequency power output circuit 34 does not advance (capacitive current) and the conversion efficiency does not decrease,
The destruction of the FETs Q2 and Q3 is prevented.

FIG. 5 is a circuit diagram showing a main configuration of a matching circuit having a low pass filter according to the fifth embodiment. In FIG. 5, this matching circuit 35 has the same structure as that shown in FIG.
Low-pass filter (LP
F) 50 is provided. The other structure is similar to that of the fourth embodiment shown in FIG. In this fifth embodiment, L
The PF 50 passes, for example, high-frequency power having a frequency of 13.56 MHz and blocks unnecessary radiation of a higher-order frequency (harmonic).

FIG. 6 is a circuit diagram showing a main structure of a matching circuit according to the sixth embodiment. In FIG. 6, this matching circuit 35 includes a capacitor C10 (capacitive reactance element X1) connected in series to the excitation coil 36.
And a coil L5 (inductive reactance element X) serially connected to the high frequency output side of the capacitor C4, that is, serially connected to the high frequency power output circuit 34 (high frequency power output power supply).
3) and a coil L6 (inductive reactance element Y2) connected between the connection point of the coil L5 and the capacitor C10 and the ground. The sixth embodiment is the fourth embodiment.
The same operation as in the embodiment of

FIG. 7 is a circuit diagram showing a main structure of a matching circuit having a leakage transformer according to the seventh embodiment. In FIG. 7, this matching circuit 35 uses a leakage transformer L8, the primary side coil is connected between the output end of the high frequency power output circuit 34 and the ground via a capacitor C4, and the secondary side coil of the leakage transformer L8 is further connected. Is the excitation coil 3 through the capacitor C11
Connected to 6.

In the seventh embodiment, the high frequency power from the high frequency power output circuit 34 is supplied to the primary side coil of the leakage transformer L8 through the capacitor C4. Further, high frequency power is derived by induction M to the secondary coil of the leakage transformer L8, and is supplied to the excitation coil 36. This structure is equivalently the same as the matching circuit 35 of the sixth embodiment shown in FIG. 6 and its operation is also the same.

FIG. 8 is a circuit diagram showing the essential structure of a matching circuit having a trap circuit according to the eighth embodiment.
In FIG. 8, this matching circuit 35 has a capacitor C10, a coil L5, and a coil L6 as in the configuration of FIG. Further, it has a capacitor C12 connected in parallel with the coil L6. The coil L6 and the capacitor C12 operate as a trap circuit 51 that resonates at a tertiary frequency of 13.56 MHz, for example.

In the eighth embodiment, the sixth embodiment shown in FIG. 6 is used.
Of the trap circuit 51.
As a result, for example, the third-order frequency signal having a frequency of 13.56 MHz is not transmitted as unnecessary radiation from the matching circuit 35, and an unreceivable frequency or the like in a nearby receiver does not occur and does not have an adverse effect.

FIG. 9 is a circuit diagram showing a main structure of a leakage transformer according to the ninth embodiment, which operates as a trap circuit. In FIG. 9, this matching circuit 35 is
The leakage transformer L9 is used, and the primary side coil is connected between the output end of the high frequency power output circuit 34 and the ground through the capacitor C4.
A resonance capacitor C14 is connected to the secondary coil of the excitation coil 9 and the excitation coil 3 is connected through the capacitor C15.
Connected to 6.

In the ninth embodiment, the high frequency power from the high frequency power output circuit 34 is supplied to the primary side coil of the leakage transformer L9 through the capacitor C4. Further, high-frequency power is led to the secondary coil of the leakage transformer L9 and supplied to the excitation coil 36. In this case, the secondary side coil of the leakage transformer L9 is, for example, 3 by the frequency of 13.56 MHz by the capacitor C14.
It resonates to the next frequency. Therefore, it is equivalently similar to the eighth embodiment shown in FIG. That is, the secondary coil of the leakage transformer L9 and the capacitor C14.
Operates similarly to the trap circuit 51 shown in FIG.

FIG. 10 is a circuit diagram showing a main structure of a matching circuit having a low pass filter according to the tenth embodiment. In FIG. 10, the matching circuit 35 is
It has the same structure as the sixth embodiment shown in FIG. That is, it has capacitors C4 and C10 and coils L5 and L6. Further, a coil L10 is provided between the capacitor C10 and the excitation coil 36. The configuration of the capacitor C10 and the coil L10 is a low pass filter (LPF) 53. In this tenth embodiment, LP
The F53 allows, for example, high-frequency power having a frequency of 13.56 MHz to pass therethrough, and blocks unnecessary radiation of higher-order frequencies.

FIG. 11 is a circuit diagram showing a main configuration of a matching circuit including a leakage transformer and a low pass filter according to the eleventh embodiment. In FIG. 11, this matching circuit 35 uses a leakage transformer L11, and the primary side coil is connected between the output end of the high frequency power output circuit 34 and the ground through a capacitor C4.
Further, a low pass filter (LPF) 54 in which a capacitor C10 and a coil L10 are connected in series is provided on the secondary side coil of the leakage transformer L11.
The fourth coil L10 is connected to the excitation coil 36.
This eleventh embodiment is equivalently the same as the configuration of FIG. 10 and its operation is also the same.

FIG. 12 is a circuit diagram showing a main configuration of a matching circuit having a trap circuit and a low pass filter according to the twelfth embodiment. In FIG. 12, this matching circuit 35 has the same configuration as that of the eighth embodiment. That is, the capacitor C4, the coil L5, and the trap circuit 56 including the coil L6 and the capacitor C12 are provided. Further, a low-pass filter (LPF) 57 including the capacitor C10 and the coil L10 shown in FIG. 10 of the tenth embodiment is provided between the coil L5 and the excitation coil 36.

The twelfth embodiment operates similarly to the eighth and tenth embodiments. That is, by the trap circuit 56, for example, the frequency of 13.56 MHz, 3
Unwanted radiation of the next frequency signal is blocked. Furthermore, LP
By F57, for example, high-frequency power having a frequency of 13.56 MHz is passed, and unnecessary radiation of higher-order frequencies is blocked.

FIG. 13 is a circuit diagram showing a main configuration of a matching circuit having a leakage transformer and a low pass filter according to the thirteenth embodiment. 13, the matching circuit 35 uses a leakage transformer L12, the primary side coil is connected between the output end of the high frequency power output circuit 34 and the ground through a capacitor C4, and the secondary side coil of the leakage transformer L12. Is provided with a low-pass filter (LPF) 59 in which a capacitor C10 and a coil L10 are connected in series. This LPF
The coil L10 of 59 is connected to the excitation coil 36.

Further, a resonance capacitor C16 is connected in parallel with the secondary coil of the leakage transformer L12. The capacitor C16 causes the secondary coil to resonate at, for example, a tertiary frequency of 13.56 MHz. This structure is equivalently similar to the twelfth embodiment shown in FIG. That is, the secondary coil of the leakage transformer L9 and the capacitor C16 operate similarly to the trap circuit 56 shown in FIG.

FIG. 14 is a circuit diagram showing the structure of a starting voltage generating circuit according to the 14th embodiment. The electrodeless discharge lamp lighting device shown in FIG. 1 is provided with a starting voltage generating circuit for facilitating the auxiliary discharge when starting the electrodeless discharge lamp 37 as shown in FIG. 31. Has been. In FIG. 14, the starting voltage generating circuit 60 is connected in series to the start switch SW whose one end is supplied with high-frequency power through the capacitor C4 of the matching circuit 35, the capacitor C19 connected to the other end, and the capacitor C19. And a coil L20. Coil L
20 is provided with a tap, and this tap is connected to the starting probe of the electrodeless discharge lamp 37.

In the fourteenth embodiment, the phase is inverted by the tap of the coil L20. As a result, the voltage (high-frequency power) generated in the excitation coil 36 and the voltage applied from the starting voltage generating circuit 60 to the starting probe are added and applied as a high voltage. Therefore, the auxiliary discharge at the start can be easily started.

FIG. 15 is a circuit diagram showing the structure of another starting voltage generating circuit according to the fifteenth embodiment. In FIG. 15, the starting voltage generating circuit 60 includes a matching circuit 35.
Start switch SW to which high frequency power is supplied to one end through the capacitor C4, a primary coil whose one end is connected to the other end and whose other end is grounded, and one end to start the electrodeless discharge lamp 37 Connected to the probe,
A starting coil L22 having a secondary coil whose other end is grounded is provided. This starting coil L22
The winding start points of the primary coil and the secondary coil are opposite to each other.

In the fifteenth embodiment, the starting coil L
The phase is inverted at 22. As a result, the excitation coil 3
The voltage (high-frequency power) generated in 6 and the voltage applied to the starting probe from the starting voltage generation circuit 60 are added to apply a high voltage. Therefore, the auxiliary discharge at the start can be easily started.

FIG. 16 is a circuit diagram showing the structure of still another starting voltage generating circuit according to the sixteenth embodiment. FIG.
In the starting voltage generating circuit 60, the start switch SW whose one end is supplied with high-frequency power through the capacitor C4 of the matching circuit 35, the capacitor C22 whose one end is connected to the other end, and the capacitor C22 and the ground. The coil L23 to be connected is provided.
The connection point between the capacitor C22 and the coil L23 is connected to the starting probe of the electrodeless discharge lamp 37.

FIG. 17 is a frequency characteristic diagram showing the operating state of the sixteenth embodiment. 16 and 17, the operating characteristic of the starting voltage generating circuit 60 is inductive.
The input impedance seen from the end of the excitation coil 36 decreases when the electrodeless discharge lamp 37 is turned on. In this case, the start switch SW is turned on at the start of starting when the electrodeless discharge lamp 37 is not lit, and the inductive starting voltage generating circuit 60 is connected, whereby the electrodeless discharge lamp 3 is connected.
The circuit characteristics are equivalent to those of when 7 is turned on. Therefore, the change in impedance at the time of starting and lighting when viewed from the output end (high-frequency power supply output end) of the high-frequency power output circuit 34 becomes small, and the FETs Q2 and Q3 perform switching operation safely.

FIG. 18 is a block diagram showing another structure of the starting voltage generating circuit according to the seventeenth embodiment. 18, in the starting voltage generating circuit 60 of this example, a start switch SW whose one end is supplied with high-frequency power through the capacitor C4 of the matching circuit 35, a capacitor C23 whose one end is connected to this other end, and this capacitor C23.
Frequency detection circuit 61 for detecting the frequency of the high frequency power supplied to the matching circuit 35.
a and an oscillation signal synchronized with the frequency detected by the frequency detection circuit 61a are supplied to the starting probe of the electrodeless discharge lamp 37, for example, a voltage controlled oscillator (VCO) 61b.
Is provided. With this configuration, the frequency deviation at the time of starting is reduced, and the electrodeless discharge lamp 37 is reliably turned on. The voltage controlled oscillator (VCO) 61b is a phase locked loop (PL) including this voltage controlled oscillator.
It may be configured as L).

FIG. 19 is a perspective view showing the mechanical structure of a high frequency power output circuit according to the 18th embodiment. In FIG. 19, the substrate portion is a direct bonding copper (D
It has a BC) substrate 62 and a DBC substrate 63. Further, the copper plates 64 and 65 arranged so as to straddle the DBC boards 62 and 63, and the L arranged on the DBC board 62.
It is composed of a letter-shaped copper plate 66 and copper plates 67, 68, 70 which are terminals arranged on the DBC substrate 63.

The copper plate 64 is to be grounded.
The FET Q3 shown in FIG. 1 is arranged at the end on the substrate 63 side. In addition, an F
ETQ2 is placed. Copper plate 6 on DBC board 62
4 and the copper plate 65, a capacitor C3 as a chip component is mounted. The drain of the FET Q2 is connected to the copper plate 65, and the DC voltage Vh is applied thereto. Further, the drain of the FET Q3 and the source of the FET Q2 are connected to the copper plate 66, and the capacitor C4 for cutting the DC of the matching circuit 35 is connected thereto. Copper plates 67,6
The gate and the source of the FET Q3 are connected to 8 respectively. The input coil L2 is connected to this gate.
Further, the gate of the FET Q2 is connected to the copper plate 70, and the input coil L1 is connected thereto.

In this configuration, the two DBC boards 62, 6 are
It is divided into three parts, and the heat generated by the switching operation of the FETs Q2 and Q3 is generated by the capacitor C of the chip component.
3 becomes difficult to conduct, and deterioration of characteristics is eliminated. Furthermore, since the heat conduction is small, the capacitor C3 is connected to the FET Q2.
Since it can be arranged in the immediate vicinity of Q3, the flow path of the loop current through the capacitor C3 becomes short, and the parasitic inductance between them becomes small. That is, the capacitor C3 operates reliably as a bypass capacitor, and stable switching operation is possible without waveform distortion (ringing) due to the switching operation.

Further, as shown by the dotted line in FIG. 19, the area of the copper plate 67 is enlarged, and the FET Q is formed in this portion R.
When the source of No. 3 is connected and it is connected to the ground (stable potential) of the housing with a metal screw or the like, the switching operation becomes stable. That is, as described above, the flow path of the loop current through the capacitor C3 becomes short, and the parasitic inductance in the meantime becomes small.

FIG. 20 is a perspective view showing the configuration of another example of the high frequency power output circuit according to the nineteenth embodiment. 20, this example has basically the same configuration as that of the eighteenth example shown in FIG. 19, except that the copper plate 64 is arranged on the L-shaped DBC substrate 72 and the DBC substrate 72 and the DB are connected to each other.
A copper plate 65 is arranged between the C board 73 and the C board 73. Also,
A through hole M penetrating the board is provided at an end portion of the copper plate 65 on the DBC board 73, and a screw Ma is inserted into the through hole M to insulate and fix the case to a housing, for example. Furthermore, DB
The C board 72 is also fixed by screws (not shown).

In this structure, since the substrates divided into the DBC substrates 72 and 73 are fixed with screws, for example, when one ceramic substrate is used instead of the DBC substrates 72 and 73 and both ends thereof are fixed with screws. As described above, cracks, which are likely to occur when the screws are strongly tightened to obtain a good potential, do not occur. Further, the potentials between the DBC substrates 72 and 73 are equalized, and the high frequency characteristics are stable.

FIG. 21 is a perspective view showing the structure of the copper plate between boards in the high frequency power output circuit according to the twentieth embodiment. 21, this example is provided with a U-shaped portion N in which the distance between the copper plates 64 and 65 shown in FIGS. 19 and 20 is gradually reduced. With this shape, the DBC substrate 7
The deformation when the screws 2 and 73 are screwed to the housing or the like is absorbed. Further, the deformations of the DBC substrates 72, 73 and the copper plates 64, 65 that are generated by the heat generated during the operation of the FETs Q2, Q3 are absorbed. Further, the heat generated by the switching operation of the FETs Q2 and Q3 is less likely to be conducted to the capacitor C3 of the chip component.

FIG. 22 is a perspective view showing the structure of the copper plate between boards in the high frequency power output circuit according to the 21st embodiment. In FIG. 22, this example shows the copper plates 64, 65 of FIG.
For the U-shaped portion N in which the space between the substrates is gradually reduced,
A meandering portion P is provided. The other configuration is similar to that of FIG. 21, and the operation is also similar.

FIG. 23 is a front view showing a connection state of the FETs Q2 and Q3 of the high frequency power output circuit 34 according to the 22nd embodiment, and FIG. 24 shows an electrical configuration of the connection state shown in FIG. It is a circuit diagram. 23 and 24, the FETs Q2 and Q3 of the high frequency power output circuit 34 are surface-mounted on, for example, a ceramic substrate, and
The source side (KS1) of TQ2 uses a wiring pattern (discard tab) that is no longer needed when mounting the FET Q2, as the primary side coil (inductance) of the coil L27. Further, the source side (KS2) of the FET Q3 uses a wiring pattern (discard tab) which is no longer needed when the FET Q3 is mounted, for the primary side coil (inductance) of the coil L28. And this coil L27,
As the secondary side coil (inductance) of 28, the wiring patterns La and Lb shown in FIG.

In this configuration, the ringing waveform has a coil L
27 and 28 are in phase. That is, it will be canceled. Therefore, a high voltage is not applied during the switching operation of the FETs Q2 and Q3, and element damage does not occur.

FIG. 25 is a front view showing a connection state of another example of the FETs Q2 and Q3 of the high frequency power output circuit 34 according to the 23rd embodiment. In the twenty-third embodiment, the wiring pattern L as the secondary coil (inductance) of the coils L27 and 28 in the twenty-second embodiment shown in FIG.
It is configured by intersecting a and Lb, and the phase here is inverted. Other configurations are the same as those in FIG.

FIG. 26 is a front view showing a connection state of yet another example of the FETs Q2 and Q3 of the high frequency power output circuit 34 according to the 24th embodiment. In the twenty-fourth embodiment,
Secondary coil of coil L27, 28 (inductance)
The wiring pattern as is meandering and intersecting, and the phase is inverted. The other configuration is shown in FIG.
Same as 3. In this configuration, since the wiring patterns La and Lb connecting the secondary side coils (inductances) of the coils L27 and 28 meander, it is difficult for the heat generated when the FETs Q2 and Q3 perform a switching operation to be mutually conducted. Therefore, the FETs Q2 and Q3 operate stably without receiving heat from the other side.

FIG. 27 is a perspective view showing the mechanical structure of the first to twenty-fourth embodiments according to the twenty-fifth embodiment. 27, in this example, the bridge rectifier 32 and the smoothing electric field capacitor C1, the DC / DC converter 33, the high frequency power output circuit 34, the matching circuit 35, and the voltage control unit 38 shown in FIG. 1 are housed in respective shield cases. Are arranged.

In this case, for example, the voltage control unit 38 includes resistors R1 and R2, a resistor Ri, an integrated circuit element (LSI) that constitutes the multiplication circuit 41, the comparator 42, the PWM circuit 43, and the drive circuit 44. The circuit board 80 on which is mounted is fixed to the lower shield plate 84 by the spacer 82 and the screw 83. At the same time, it is screwed and fixed to the member of the housing 87. In this state, the shield case 84 is arranged so as to cover the circuit board 80 and the lower shield plate 84.
In this shield case 84, screws 85 are inserted into through holes of projecting portions provided at four lower corners, and a casing 87 is provided.
It is fixed by screwing on.

The other bridge rectifier 32, the smoothing electric field capacitor C1, the DC / DC converter 33, the high frequency power output circuit 34, and the matching circuit 35 are also arranged in the case 87 in the same configuration. A heat sink 88 is attached to the lower surface of the casing 87. further,
A metal lid 89 is fixed to the open surface of the housing 87 with four screws 90.

In this structure, the voltage control unit 38 is shielded from the bridge rectifier 32 and the smoothing electric field capacitor C1, and the whole is shielded by the casing 87 and the metal lid 89. Therefore, unnecessary radiation can be significantly reduced. In addition, conventionally, it is possible to assemble each block in a shield structure in which each block is divided by only a side surface by a commonly used shield plate, and the degree of freedom of production is improved. Further, the heat generated in each block is isolated from the other blocks by the air, so that it is difficult to conduct the heat, and the operation of each block is stabilized. Further, it is not necessary to consider the relationship between heat generation and operation, and the degree of freedom in the arrangement can be obtained.

FIG. 28 is a perspective view showing another example of the mechanical construction of the first to twenty-fourth embodiments according to the twenty-sixth embodiment. 28, in this example, the bridge rectifier 32 and the smoothing electric field capacitors C1 and DC shown in FIG. 1 are used.
The circuit boards of the DC converter 33, the high frequency power output circuit 34, the matching circuit 35, and the voltage control unit 38 are housed in the shield cases 90 and 91, respectively, and the heat sinks 92 and 93 are individually attached, and individual blocks are attached. It is arranged on the mounting plate 94. After that, the entire block is covered with the shield case 95.

In this case, the mounting plate 94 has rectangular through holes 97, 9 into which the heat sinks 92, 93 are inserted.
8,99 are provided. After inserting the heat sinks 92 and 93 into the through holes 97 to 99, the screws 100 are inserted into the protruding portions of the lower portions of the shield cases 90 and 91 and fixed to the mounting plate 94. Also, the heat sink 9
The screws 2 and 93 are also fixed to the mounting portions (not shown) of the shield cases 90 and 91 with screws 102. Further, the shield case 95 is fixed to an exterior body (not shown) with screws 103.

In this structure, the through hole 97 of the mounting plate 94 is used.
The arrangement position of each block is defined by ~ 99, and the arrangement and the fixing at the time of assembly become easy. Further, the heat sinks 92 and 93 are individually attached to each block. Therefore, a block that does not require the heat sinks 92 and 93 has a relatively heavy heat sink 9
Since a metal plate can be attached instead of 2, 93, the total weight can be reduced. Other than this,
The operation and effect are similar to those of the twenty-fifth embodiment shown in FIG. 27.

FIG. 29 is a diagram showing an illumination device using the electrodeless discharge lamp lighting device shown in FIGS. 1 to 27 according to the 27th embodiment. In FIG. 29, this lighting device is shown in FIG.
The reflector 120 is provided in the vicinity of the electrodeless discharge lamp 37 having the structure shown in FIG. Other configurations are the same as those in FIG. The operation in this case is also similar to the configuration shown in FIG.

Incidentally, the electrodeless discharge lamp lighting device shown in the first to twenty-sixth embodiments (FIGS. 1 to 28),
The lighting device shown in the 28th embodiment (FIG. 29) is equipped with the electrodeless discharge lamp 37, but may be a power supply device not equipped with the electrodeless discharge lamp 37. In this case, after shipping this device, the electrodeless discharge lamp 3
7 is placed in the excitation coil 36. At the same time, the reflection plate 120 is attached and used.

[0091]

As is apparent from the above description, the power supply device according to claims 1, 3, 5 to 9 is based on the detected product of the DC voltage and the current value applied to the high frequency power output means. Constant power control is performed in which a direct-current voltage is applied to the high-frequency power output means by controlling the direct-current voltage varying means, and the high-frequency power output from the high-frequency power output means is made constant. At the same time, when the overvoltage is detected, the DC voltage varying means is controlled to prevent the overvoltage, so that the high-frequency power to the electrodeless discharge lamp can be reliably maintained at the predetermined power and its design is easy. Become. For example, there is no need for time-consuming fine adjustment of frequency when performing closed-loop control for making the high-frequency power from the conventional excitation coil constant at a predetermined power, and the cost can be reduced.

According to another aspect of the power supply device of the present invention, the DC voltage based on the detected sum of the DC voltage applied to the high frequency power output means and the current value is controlled by the DC voltage varying means. Approximate constant power control for applying high frequency power to the power output means to make the high frequency power constant is performed. At the same time, when the overvoltage is detected, the DC voltage varying means is controlled to prevent the overvoltage, so that the signal processing can be simplified and the high frequency power to the electrodeless discharge lamp can be reliably maintained at the predetermined power. It has the effect that it can be kept constant, its design becomes easy, and cost can be reduced.

In the electrodeless discharge lamp lighting device according to a tenth aspect of the present invention, the above-mentioned power supply device is provided with an electrodeless discharge lamp which is lit by the high frequency power from the excitation coil. In addition to the effect that the constant power control is performed, the overvoltage can be prevented, and the high frequency power to the electrodeless discharge lamp can be reliably maintained at the predetermined power.

According to an eleventh aspect of the present invention, in the structure of the electrodeless discharge lamp lighting device according to the tenth aspect, at least a casing for accommodating the power supply device and a reflecting means for reflecting the light emitted from the electrodeless discharge lamp are provided. As in the electrodeless discharge lamp lighting device, constant power control or approximate constant power control is performed, overvoltage is prevented, and high-frequency power to the electrodeless discharge lamp is reliably kept at a predetermined power level. It has the effect that it can be converted.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a first embodiment for performing constant power control of an electrodeless discharge lamp lighting device of the present invention.

FIG. 2 is a circuit diagram showing a configuration of main parts when performing approximate constant power control according to a second embodiment.

FIG. 3 is a circuit diagram showing a main configuration for performing constant power control and overvoltage control according to a third embodiment.

FIG. 4 is a circuit diagram showing a main configuration of a matching circuit according to a fourth embodiment.

FIG. 5 is a circuit diagram showing a main configuration of a matching circuit including a low-pass filter according to a fifth embodiment.

FIG. 6 is a circuit diagram showing a main configuration of a matching circuit according to a sixth embodiment.

FIG. 7 is a circuit diagram showing a main configuration of a matching circuit including a leakage transformer according to a seventh embodiment.

FIG. 8 is a circuit diagram showing a main configuration of a matching circuit including a trap circuit according to an eighth embodiment.

FIG. 9 is a circuit diagram showing a main configuration of a leakage transformer according to a ninth embodiment, which operates as a trap circuit.

FIG. 10 is a circuit diagram showing a main configuration of a matching circuit including a low pass filter according to a tenth embodiment.

FIG. 11 is a circuit diagram showing a main configuration of a matching circuit including a leakage transformer and a low pass filter according to an eleventh embodiment.

FIG. 12 is a circuit diagram showing a main configuration of a matching circuit including a trap circuit and a low pass filter according to a twelfth embodiment.

FIG. 13 is a circuit diagram showing a main configuration of a matching circuit including a leakage transformer and a low pass filter according to a thirteenth embodiment.

FIG. 14 is a circuit diagram showing a configuration of a starting voltage generating circuit according to a fourteenth embodiment.

FIG. 15 is a circuit diagram showing the configuration of another starting voltage generating circuit according to the fifteenth embodiment.

FIG. 16 is a circuit diagram showing a configuration of still another starting voltage generating circuit according to the sixteenth embodiment.

FIG. 17 is a frequency characteristic diagram showing an operating state of the sixteenth embodiment.

FIG. 18 is a block diagram showing another configuration of the starting voltage generating circuit according to the seventeenth embodiment.

FIG. 19 is a perspective view showing a mechanical configuration of a high frequency power output circuit according to an eighteenth embodiment.

FIG. 20 is a perspective view showing a mechanical configuration of a high frequency power output circuit of another example according to the 19th embodiment.

FIG. 21 is a perspective view showing a configuration of an inter-substrate copper plate in a high frequency power output circuit according to a twentieth embodiment.

FIG. 22 is a perspective view showing a configuration of an inter-substrate copper plate in a high frequency power output circuit according to a 21st embodiment.

FIG. 23 is a front view showing a connection state of FETs of the high-frequency power output circuit according to the 22nd embodiment.

24 is a circuit diagram showing an electrical configuration of the connection state shown in FIG.

FIG. 25 is a front view showing the connection state of another example of the FET of the high-frequency power output circuit according to the 23rd embodiment.

FIG. 26 is a front view showing a connection state of yet another example of the FET of the high-frequency power output circuit according to the twenty-fourth embodiment.

FIG. 27 is a second example of the first example according to the twenty-fifth example.
It is a perspective view which shows the mechanical structure of the Example of FIG.

FIG. 28 is a view showing the second embodiment from the first embodiment according to the 26th embodiment.
It is a perspective view which shows the other example of the mechanical structure of 4th Example.

FIG. 29 is a view showing an illuminating device using an electrodeless discharge lamp lighting device according to a 27th embodiment.

FIG. 30 is a block diagram showing a schematic configuration of a conventional electrodeless discharge lamp lighting device for performing constant control of high-frequency power.

FIG. 31 is a circuit diagram showing a main configuration of an electrodeless discharge lamp lighting device provided with a conventional starting voltage generating circuit.

[Explanation of symbols]

 33 DC / DC converter 34 High-frequency power output circuit 35 Matching circuit 36 Excitation coil 37 Electrodeless discharge lamp 38 Voltage control unit 39 Switching signal generation unit 41 Multiplier circuit 42 Comparator 43 PWM circuit 44 Drive circuit

Claims (11)

[Claims] 1. A power supply device for supplying high-frequency power for lighting an electrodeless discharge lamp from an excitation coil, comprising a DC voltage varying means for varying and outputting a DC voltage, and a DC voltage from the DC voltage varying means. High frequency power output means for applying a voltage to output high frequency power, voltage detection means for detecting a DC voltage applied to the high frequency power output means, and current detection means for detecting a current flowing through the high frequency power output means. A multiplying unit for obtaining a multiplied value of a voltage value detected by the voltage detecting unit and a current value detected by the current detecting unit; and a DC voltage based on the multiplying value, controlling the DC voltage changing unit, A constant-power control unit that controls the high-frequency power that is applied to the high-frequency power output unit so as to make the high-frequency power output from the high-frequency power output unit constant, and a power supply device. 2. A power supply device for supplying a high-frequency power for lighting an electrodeless discharge lamp from an excitation coil, wherein a direct-current voltage varying means for varying and outputting a direct-current voltage, and a direct-current from the direct-current voltage varying means. High frequency power output means for applying a voltage to output high frequency power, voltage detection means for detecting a DC voltage applied to the high frequency power output means, and current detection means for detecting a current flowing through the high frequency power output means. An adding unit that adds a voltage value detected by the voltage detecting unit and a current value detected by the current detecting unit; and a DC voltage based on the added value, by controlling the DC voltage changing unit to generate the high-frequency power. A power supply device, comprising: power control means for controlling the high frequency power applied to the output means to be constant from the high frequency power output means. 3. A power supply device for supplying high-frequency power for lighting an electrodeless discharge lamp from an excitation coil, comprising direct-current voltage varying means for varying and outputting direct-current voltage, and direct-current from the direct-current voltage varying means. High frequency power output means for applying a voltage to output high frequency power, voltage detection means for detecting a DC voltage applied to the high frequency power output means, and current detection means for detecting a current flowing through the high frequency power output means. A multiplying unit for obtaining a multiplied value of a voltage value detected by the voltage detecting unit and a current value detected by the current detecting unit; and a DC voltage based on the multiplying value, controlling the DC voltage changing unit, A constant power control unit that applies a high frequency power output unit to control the high frequency power output from the high frequency power output unit to be constant, and the voltage detection unit detects an overvoltage. Power supply, characterized in that it comprises, an overvoltage control means for performing the control for preventing the output of the DC voltage varying means is controlled to the overvoltage. 4. A power supply device for supplying high-frequency power for lighting an electrodeless discharge lamp from an excitation coil, comprising direct-current voltage varying means for varying and outputting direct-current voltage, and direct-current from the direct-current voltage varying means. High frequency power output means for applying a voltage to output high frequency power, voltage detection means for detecting a DC voltage applied to the high frequency power output means, and current detection means for detecting a current flowing through the high frequency power output means. An adding unit that adds a voltage value detected by the voltage detecting unit and a current value detected by the current detecting unit; and a DC voltage based on the added value, by controlling the DC voltage changing unit to generate the high-frequency power. Power control means for controlling the high frequency power applied to the output means to make the high frequency power output from the high frequency power output means constant, and before the voltage detection means detects an overvoltage Power supply, characterized in that it comprises, an overvoltage control means for performing control by controlling the DC voltage varying means to prevent output overvoltage. 5. A first resistor connected in series to the voltage detecting means for performing voltage detection for dividing the DC voltage from the DC voltage varying means to control power, and a DC voltage from the DC voltage varying means. Second series connection that divides the voltage to detect overvoltage
And a resistor of claim 1.
Alternatively, the power supply device according to item 4. 6. The current detecting means is a resistor through which a current flowing through the high frequency power output means flows, and a voltage value due to a voltage drop in the resistor is detected as a current value. , 2, 3 or 4 power supply device. 7. The constant power control means is provided with an error amplifier for comparing a multiplication value with a preset reference value, and the direct current voltage varying means outputs a direct current voltage based on the comparison value from the error amplifier. The power supply device according to claim 1, wherein the power supply device is a power supply device. 8. The power control means is provided with an error amplifier for comparing the added value with a preset reference value, and the direct current voltage varying means outputs a direct current voltage based on the comparison value from the error amplifier. The power supply device according to claim 2, wherein the power supply device is a power supply device. 9. The overvoltage control means is provided with an error amplifier for comparing the divided voltage of the second resistor with a preset reference value, and a DC voltage based on the comparison value from the error amplifier The power supply device according to claim 1, 2, 3, 4 or 5, wherein the voltage varying means outputs the voltage. 10. The electrodeless discharge lamp lighting device according to claim 1, further comprising an electrodeless discharge lamp that is lit with high-frequency power from an excitation coil in the configuration of the power supply device according to any one of claims 1 to 9. . 11. A lighting device comprising the electrodeless discharge lamp lighting device according to claim 10, comprising at least a housing for accommodating a power supply device, and a reflecting means for reflecting light emitted from the electrodeless discharge lamp. apparatus.