JP2003018849A - Power supply device and discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device which can reduce noise generated by a DC power supply circuit and a high frequency power supply circuit, avoid malfunctionings of the respective circuits caused by noise generated by the circuits, and secure stable circuit operations. SOLUTION: This power supply device has first and second DC power supply circuits 1 and 2 which output DC voltages, a high frequency power supply circuit 4 which has at least one switching device and converts the DC voltage of the first DC power supply circuit 1 into a high frequency AC voltage which is supplied to a load, and a drive circuit 3 which drives the switching device of the high frequency power supply circuit 4. Further, a first noise filter 81 comprising a plurality of stages is provided between the output unit of the first DC power supply circuit 1 and the input unit of the high frequency power supply circuit 4.

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 provided with a DC power supply circuit for outputting a DC voltage and a high frequency power supply circuit for converting the DC voltage of the DC power supply circuit into a high frequency AC voltage and supplying it to a load. And a discharge lamp lighting device using the power supply device.

[0002]

2. Description of the Related Art As a conventional power supply device of this type,
For a device having two DC power supply circuits, for example, FIG.
There is a configuration shown in (Japanese Patent Laid-Open No. 10-14243).
issue). In this power supply device, two rectifiers DB1 and DB2 are connected to a commercial power supply AC, and each rectifier DB1 and DB2 is connected.
First and second DC power supply circuits 1 and 2 that output a DC voltage are individually connected to 2.

First DC power supply circuit 1 in this circuit
Is composed of, for example, a step-up chopper circuit, and a high-frequency power supply circuit 4 for converting the DC voltage of the first DC power supply circuit 1 into a high-frequency AC voltage and supplying the high-frequency AC voltage to a load is connected to the output terminal thereof. There is. On the other hand, the second DC power supply circuit 2
For example, it is configured by a step-down chopper circuit, and the output terminal thereof is connected to a drive circuit 3 which uses the DC voltage of the second DC power supply circuit 2 as a power source, and the output terminal of the drive circuit 3 is a high frequency power source. It is connected to the control terminal of the switching element that constitutes the circuit 4.

Further, at the output terminal of the high frequency power supply circuit 4,
A high-frequency power supply coil 6 is connected via a matching circuit 5 for impedance matching, and an electrodeless discharge lamp 7 serving as a load of the power supply device is arranged in proximity to the high-frequency power supply coil 6.

In the power supply device having this structure, the AC power supply A
When the AC voltage is input from C, the AC voltage AC is
It is rectified by the rectifiers DB1 and DB2 and supplied to the first and second DC power supply circuits 1 and 2, so that the DC voltages E1 and E2 of the first and second DC power supply circuits 1 and 2 rise. . Then, the high frequency AC voltage output from the drive circuit 3 driven by the second DC power supply circuit 2 is amplified by the high frequency power supply circuit 4 which is supplied with power by the first DC power supply circuit 1, and then the matching circuit 5 Is supplied to the induction coil 6 via. Along with this, a high-frequency magnetic field of several MHz to several hundred MHz is generated in the high-frequency power supply coil 6, high-frequency power is supplied to the electrodeless discharge lamp 7, a high-frequency plasma current is generated in the electrodeless discharge lamp 7, and ultraviolet rays are generated. Alternatively, it produces visible light.

As described above, the two DC power supply circuits 1 and 2 are used.
The reason why the DC power supply is provided as two systems by providing the above is because of the following reason. That is, in a state where the output voltage of the second DC power supply circuit 2 is set lower than the output voltage of the first DC power supply circuit 2, the output voltage of the second DC power supply circuit 2 is controlled to output the output of the drive circuit 3. When the voltage is changed, the output voltage of the high frequency power supply circuit 4 changes greatly according to this,
With this, the dimming control of the electrodeless discharge lamp 7 can be easily performed. Moreover, at this time, by keeping the output voltage of the first DC power supply circuit 1 constant without changing, the power loss of the switching element of the high frequency power supply circuit 4 can be reduced, and the circuit efficiency of the entire device is improved. This is because advantages such as It should be noted that, as related arts related to the invention of the present application which will be described in detail below, as a conventional technique having one DC power supply circuit, there are JP-A-5-275183 and JP-A-2000-
68087 and so on.

[0007]

When the electrodeless discharge lamp 7 is used as a load, the high frequency power supply circuit 4 is usually used.
The operating frequency is from several MHz to several hundred MHz. on the other hand,
The operating frequency when the first and second DC power supply circuits 1 and 2 are chopper circuits is several tens kHz to several hundreds kHz.
As described above, when the operating frequencies of the circuits 1, 2 and 4 are different from each other, the first and second DC power supply circuits 1 and 2 and the high frequency power supply circuit 4 are affected by noise of frequency components other than the unique frequency. Therefore, the operation of each circuit becomes unstable. as a result,
Each power supply circuit 1, 2, drive circuit 3, high frequency power supply circuit 4
May not only malfunction but may cause a problem that the noise generated by the device increases as a whole.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce noise generated from a DC power supply circuit or a high frequency power supply circuit as a whole, and to reduce these circuits. It is an object of the present invention to provide a power supply device that prevents malfunction of each circuit due to noise generated from the power supply device and ensures stable circuit operation, and a discharge lamp lighting device using the power supply device.

[0009]

In order to solve the above problems, the present invention has first and second DC power supply circuits for outputting a DC voltage, and at least one switching element. A high frequency power supply circuit for converting a direct current voltage of the direct current power supply circuit into a high frequency alternating current voltage and supplying it to a load; and a drive circuit for driving a switching element of the high frequency power supply circuit using the direct current voltage of the second direct current power supply circuit as a power source. In the power supply device including the following, the following configuration is adopted.

That is, according to the first aspect of the invention, a first noise filter having a plurality of stages is provided between the output section of the first DC power supply circuit and the input section of the high frequency power supply circuit. I am trying.

According to a second aspect of the invention, in the configuration of the first aspect of the invention, a second noise having a plurality of stages is provided between the output section of the second DC power supply circuit and the input section of the drive circuit. A filter is provided.

According to a third aspect of the invention, in the configuration of the second aspect of the invention, the first noise filter and the second noise filter are provided.
At least one of the noise filters has different frequency characteristics for each stage.

According to a fourth aspect of the invention, in the configuration of the second or third aspect of the invention, at least one of the first noise filter and the second noise filter is
Normal filters are provided on both the high-voltage output side and the low-voltage output side of the first or second DC power supply circuit.

According to a fifth aspect of the invention, in the configuration of the fourth aspect of the invention, the normal filter has the same frequency characteristic for each stage.

According to a sixth aspect of the present invention, in the configuration of any one of the second to fifth aspects, the first noise filter is arranged at an output section of the first DC power supply circuit. Between the smoothing capacitor and the high frequency power supply circuit, the second noise filter is provided between the smoothing capacitor arranged at the output part of the second DC power supply circuit and the input part of the drive circuit. Each is provided.

According to a seventh aspect of the present invention, in the configuration according to any one of the second to fifth aspects, at least one of the first noise filter and the second noise filter is more than the smoothing capacitor. Is also provided on the DC power supply circuit side.

According to an eighth aspect of the present invention, in the configuration of any one of the first to seventh aspects of the present invention, the first noise filter removes noise at the operating frequency of the first DC power supply circuit. A filter for attenuating and a filter for reducing noise at the operating frequency of the high frequency power supply circuit are included.

According to a ninth aspect of the present invention, in the configuration of the second aspect of the present invention, the second noise filter eliminates noise at the operating frequency of the second DC power supply circuit. It includes a filter for attenuating and a filter for attenuating noise at the operating frequency of the drive circuit.

According to a tenth aspect of the present invention, in the configuration according to any one of the first to ninth aspects, at least one of the first and second DC power supply circuits has a high voltage output side and a low voltage side. The power supply lines on the output side are arranged substantially parallel to each other.

According to an eleventh aspect of the invention, in the configuration of the invention according to any one of the second to tenth aspects, the power supply line on the low voltage output side of the second DC power supply circuit is the second noise filter. Is connected to the first noise filter connected to the power supply line on the low voltage output side of the first DC power supply circuit via.

According to a twelfth aspect of the present invention, in the configuration of the eleventh aspect of the invention, at least the high frequency power supply circuit is provided between the confluence of the power supply lines on the low voltage output side and the input section of the high frequency power supply circuit. A filter for attenuating the noise of the operating frequency and a filter for attenuating the harmonic of the operating frequency of the high frequency power supply circuit are provided.

According to a thirteenth aspect of the invention, in the configuration of the twelfth aspect of the invention, the filter for attenuating noise at the operating frequency of the high frequency power supply circuit is arranged in the vicinity of the switching element of the high frequency power supply circuit. .

According to a fourteenth aspect of the present invention, in the configuration of any one of the first to thirteenth aspects, the first DC power supply circuit is a step-up / down chopper circuit, and the second DC power supply. The circuit is a step-down chopper circuit.

According to a fifteenth aspect of the invention, in the configuration of the invention according to any one of the first to fourteenth aspects, the operating frequencies of the high frequency power supply circuit and the drive circuit are several hundred kHz to several tens MHz. is there.

According to a sixteenth aspect of the present invention, there is provided a discharge lamp lighting device including the power supply device according to any one of the first to fifteenth aspects, wherein the load is an electrodeless discharge lamp.

A discharge lamp lighting device according to a seventeenth aspect of the present invention has first and second DC power supply circuits that output a DC voltage and at least one switching element, and the DC of the first DC power supply circuit A high-frequency power supply circuit for converting a voltage into a high-frequency AC voltage and supplying the load to a load; and a drive circuit for driving a switching element of the high-frequency power supply circuit by using the DC voltage of the second DC power supply circuit as a power supply. A first noise filter having a plurality of stages between the output part of the DC power supply circuit and the input part of the high frequency power supply circuit,
A second noise filter having a plurality of stages is provided between the output section of the second DC power supply circuit and the input section of the drive circuit, and at least one of the first noise filter and the second noise filter is provided. The frequency characteristic is different for each stage, and at least one of the first noise filter and the second noise filter is a normal filter for both the high voltage output side and the low voltage output side of the first or second DC power supply circuit. And at least one of the first and second DC power supply circuits has power supply lines on the high-voltage output side and the low-voltage output side thereof arranged substantially parallel to each other.
The DC power supply circuit is a step-up / down chopper circuit, the second DC power supply circuit is a step-down chopper circuit, and the operating frequencies of the high frequency power supply circuit and the drive circuit are several hundred kHz to
It is several tens of MHz, and the load is an electrodeless discharge lamp.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a power supply device of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a circuit configuration diagram of a power supply device according to a first embodiment of the present invention, and the same reference numerals are given to the components corresponding to those of the conventional example shown in FIG. . The power supply device according to the first embodiment is 2
Two rectifiers DB1 and DB2 are connected to each rectifier DB
First and second DC power supply circuits 1 and 2 that output a DC voltage are individually connected to 1 and DB2.

The first DC power supply circuit 1 is composed of, for example, a step-up chopper circuit, and the output terminal thereof is connected to the high frequency power supply circuit 4 via a smoothing capacitor 10 and a first noise filter 81 described later. Has been done. Meanwhile, the second
The DC power supply circuit 2 is composed of, for example, a step-down chopper circuit, and the output terminal thereof is connected to the drive circuit 3 which uses the DC voltage of the second DC power supply circuit 2 as a power supply via the smoothing capacitor 11. Has been done. The output terminal of the drive circuit 3 is connected to the control terminal of the switching element forming the high frequency power supply circuit 4. Further, the output terminal of the high frequency power supply circuit 4 is connected to a high frequency power supply coil 6 via a matching circuit 5 for impedance matching. An electrodeless discharge lamp 7 which serves as a load of the power supply device is arranged near the high frequency power supply coil 6.

The above-mentioned first noise filter 81 is
It is inserted between the output part of the DC power supply circuit 1 and the input part of the high frequency power supply circuit 4, and the frequency characteristics are set to be different for each stage. That is, the first noise filter 81 has a two-stage structure including a front-side normal filter 81a including an inductor L1 and a capacitor C1 and a rear-side normal filter 81b including an inductor L2 and a capacitor C2. The inductors L1 and L2 are provided in the power supply line on the high voltage output side of the first DC power supply circuit 1. The normal filter 81a on the front stage side has a frequency characteristic that attenuates noise of several tens kHz to several hundreds kHz generated from the first DC power supply circuit 1, and the normal filter 81b on the rear stage side.
Is several MHz to several hundred MHz generated from the high frequency power supply circuit 4.
The frequency characteristics are set so as to attenuate the noise.

In the first embodiment, the smoothing capacitor 1
The first noise filter 81 is provided on the output side with respect to 0. With such a configuration, the first DC power supply circuit 1
It is possible to prevent an adverse effect such that the inductor component of the first noise filter 82 is abruptly included in the portion where the switching current of (1) flows and a surge voltage is generated in the switching element of the first DC power supply circuit 1. it can.

In the above structure, when an AC voltage is input from the AC power supply AC, the AC voltage AC is applied to each rectifier D.
It is rectified by B1 and DB2. Each of these rectifiers D
When the voltage rectified by B1 and DB2 rises, the DC voltage E1 of the first DC power supply circuit 1 and the DC voltage E2 of the second DC power supply circuit 2 rise. Then, the high frequency AC voltage output from the drive circuit 3 driven by the second DC power supply circuit 2 is amplified by the high frequency power supply circuit 4 which is supplied with power by the first DC power supply circuit 1, and then the matching circuit 5 Is supplied to the induction coil 6 via. Further, the induction coil 6 generates a high-frequency electromagnetic field to light the electrodeless discharge lamp 7.

Here, during the operation of the power supply device, noise of several tens of kHz to several hundreds of kHz is generated from the first DC power supply circuit 1. This noise is on the front stage side which constitutes the first noise filter 81. Is attenuated by the normal filter 81a. In addition, from the high frequency power supply circuit 4, several MHz to several hundred MH
Although z noise is generated, this noise is attenuated by the normal filter 81b on the subsequent stage side. As described above, the first DC power supply circuit 1 and the high-frequency power supply circuit 1 are used by using the normal filters 81a and 81b on the front stage side and the rear stage side that form the first noise filter 81, which have different frequency characteristics from each other. The noise generated from No. 4 can be effectively reduced. In addition, it is possible to reliably prevent a malfunction in which the first DC power supply circuit 1 and the high frequency power supply circuit 4 adversely affect each other to cause a malfunction.

[Second Embodiment] FIG. 2 is a circuit configuration diagram of a power supply device according to a second embodiment of the present invention. The same reference numerals are given to the components corresponding to those of the first embodiment shown in FIG. Attach. Also in the power supply device according to the second embodiment, as in the case of the first embodiment, the normal filter 82a on the upstream side is provided between the output part of the first DC power supply circuit 1 and the input part of the high frequency power supply circuit 4. The first noise filter 82 having a two-stage configuration including the normal filter 82b on the rear stage side is interposed.

However, in the second embodiment, unlike the case of the first embodiment, the normal filter 82a on the front stage side includes two inductors L1 and L1 'and a capacitor C1, and the normal filter 82b on the rear stage side.
Are two inductors L2 and L2 'and a capacitor C2
And the first DC power supply circuit 1
Each normal filter 82 on the power supply line on the high voltage output side of
One of the inductors L1 and L2 of a and 82b and the other of the inductors L1 ′ and L2 ′ are arranged on the power supply line on the low voltage output side. The normal filter 82a on the front stage side has a frequency characteristic that attenuates noise of tens to hundreds of kHz generated from the first DC power supply circuit 1, and the normal filter 82b on the rear stage side is the high frequency power supply circuit 4 The frequency characteristics are set so as to attenuate the noise of several MHz to several hundreds of MHz generated from each. In addition, in the second embodiment, the single rectifier DB is provided for the first and second DC power supply circuits 1 and 2, but each DC power supply circuit 1 and 2 is provided as in the first embodiment. Alternatively, the rectifiers DB1 and DB2 may be individually used. The other configuration is the same as that of the first embodiment, and therefore detailed description thereof is omitted here.

Also in the second embodiment, as in the case of the first embodiment, the noise generated from the first DC power supply circuit 1 is caused by the normal filter 82a on the upstream side constituting the first noise filter 82. Further, the noise generated from the high frequency power supply circuit 4 is the normal filter 82 on the subsequent stage side.
b can be effectively reduced. In particular, in the second embodiment, the inductors L1, L2 and L1 ', L2' are individually arranged in the high-voltage output side and the low-voltage output side power supply lines of the first DC power supply circuit 1, respectively. Several MHz generated in high frequency power supply circuit 4
-Noise of several hundred MHz is generated by the normal filter 8 on the downstream side.
2b prevents the output voltage of the first DC power supply circuit 1 from being transmitted to both the high-voltage side and low-voltage side power supply lines. Therefore, for example, it is possible to reliably prevent an adverse effect that noise is transmitted to the chopper control IC operating on the low voltage side built in the first DC power supply circuit 1 and the element is destroyed. As described above, the power supply device according to the second embodiment can reduce the noise generated from the first DC power supply circuit 1 and the high-frequency power supply circuit 4 more reliably than in the case of the first embodiment. It is possible to prevent a malfunction in which the power supply circuit 1 and the high frequency power supply circuit 4 adversely affect each other to cause a malfunction.

[Third Embodiment] FIG. 3 is a circuit configuration diagram of a power supply device according to a third embodiment of the present invention. The same reference numerals are given to the components corresponding to those of the first embodiment shown in FIG. Attach. In the power supply device according to the third embodiment, a first DC power supply circuit 1 has an output section and a high frequency power supply circuit 4 has an input section between which the first output section is provided.
Noise filter 83 is interposed, and a second noise filter 93 is interposed between the output part of the second DC power supply circuit 2 and the input part of the drive circuit 3.

The first noise filter 83 has a three-stage structure including a front-stage normal filter 83a, an intermediate normal filter 83b, and a rear-stage normal filter 83c. Front-stage normal filter 83a
Are two inductors L1 and L1 'and a capacitor C1
Thus, the intermediate normal filter 83b includes the two inductors L2 and L2 'and the capacitor C2, and the downstream normal filter 83c includes the two inductors L5 and L5.
It is composed of L5 'and a capacitor C5. Then, one inductor L1, L2, L5 of each of the normal filters 83a to 83c is connected to the power supply line on the high voltage output side of the first DC power supply circuit 1, and the other inductor L1 ′, L2 is connected to the power supply line on the low voltage output side. 'And L5' are arranged respectively. The normal filter 83a on the upstream side is several tens of kHz generated from the first DC power supply circuit 1.
z-several hundreds of kHz frequency characteristic that attenuates noise, and the intermediate normal filter 83b has a frequency characteristic that attenuates harmonic noise higher than the operating frequency of the high-frequency power supply circuit 4. The filters 83c are set to have frequency characteristics such that noise of an operating frequency of several MHz to several hundred MHz generated from the high frequency power supply circuit 4 is attenuated.

On the other hand, the second noise filter 93 has a two-stage structure having a front stage normal filter 93a and a rear stage normal filter 93b. The normal filter 93a on the front side has two inductors L3 and L3.
3'and the capacitor C3, the latter-stage normal filter 93b is composed of two inductors L4 and L4 'and the capacitor C4, respectively, and each normal filter is connected to the power supply line on the high voltage output side of the second DC power supply circuit 2. One of the inductors L3 and L4 of one of 93a and 93b
However, the other inductor L is connected to the power supply line on the low voltage output side.
3'and L4 'are arranged respectively. The normal filter 93a on the front side has a frequency characteristic that reduces noise in the operating frequency of the second DC power supply circuit 2, and the normal filter 93b on the rear side includes the drive circuit 3
The frequency characteristics are set so as to reduce the noise of the operating frequency.

Therefore, in the power supply device according to the third embodiment, the noise generated from the first DC power supply circuit 1 and the high frequency power supply circuit 4 is not only effectively reduced by the first noise filter 83, but also the second noise filter 83 is used. The noise filter 93 can effectively reduce the noise generated from the second DC power supply circuit 2 and the drive circuit 3. For this reason, the first DC power supply circuit 1 and the high-frequency power supply circuit 4 adversely affect each other, and the second DC power supply circuit 2 and the drive circuit 3 adversely affect each other. It is possible to reliably prevent a malfunction such as a malfunction.

Further, in the third embodiment, the power supply line on the low voltage output side of the second DC power supply circuit 2 is connected to the first DC power supply circuit via the inductors L3 'and L4' of the second noise filter 93. 1 connected to the power supply line on the low voltage output side of No. 1
Of the noise filter 83 are connected to the inductors L2 'and L5' on the intermediate side and the rear side of the noise filter 83, respectively. Therefore, for example, the noise of the high frequency power supply circuit 4 is provided inside the first and second DC power supply circuits 1 and 2 connected to the power supply line on the low voltage output side. It is possible to reliably prevent an adverse effect that the element is transmitted to the element and is destroyed.

Further, in the third embodiment, the high-voltage output side and the low-voltage output side of the first DC power supply circuit 1 and the high-voltage output side and the low-voltage output side of the second DC power supply circuit 2 are connected to each other. The respective power supply lines are arranged substantially parallel to each other. As a result, stray capacitance is generated between the high-voltage side and low-voltage side power supply lines, so that noise between lines can be reduced at the same time, and the above effect can be further enhanced.

[Fourth Embodiment] FIG. 4 is a circuit configuration diagram of a power supply device according to a fourth embodiment of the present invention. The same reference numerals are given to the components corresponding to those of the first embodiment shown in FIG. Attach. In the power supply device according to the fourth embodiment, the first DC power supply circuit 1 has a first part between the output part and the high-frequency power supply circuit 4 and the input part.
Noise filter 84 is interposed, and a second noise filter 94 is interposed between the output portion of the second DC power supply circuit 2 and the input portion of the drive circuit 3.

The first noise filter 84 has a two-stage structure including a normal filter 84a on the front side and a normal filter 84b on the rear side. The normal filter 84a on the front side includes two inductors L1 and L.
1'and the capacitor 10, the normal filter 84b on the latter stage side is composed of two inductors L2 and L2 'and the capacitor C2. The capacitor 10 of the normal filter 84a on the upstream side also serves as the smoothing capacitor of the first DC power supply circuit 1. In addition, the inductors L1 and L2 of one of the normal filters 84a and 84b are connected to the power supply line on the high voltage output side of the first DC power supply circuit 1, and the inductors L1 ′ and L2 ′ of the other are connected to the power supply line on the low voltage output side. Each is arranged. The normal filter 84a on the front stage side has a frequency characteristic that attenuates noise of tens to hundreds of kHz generated from the first DC power supply circuit 1, and the normal filter 84b on the rear stage side is the high frequency power supply circuit 4 The frequency characteristics are set so as to attenuate the noise of the operating frequency of several MHz to several hundred MHz generated from the above.

On the other hand, the second noise filter 94 has a two-stage structure having a front-side normal filter 94a and a rear-side normal filter 94b. The normal filter 93a on the front side has two inductors L3 and L3.
The normal filter 94b on the subsequent stage is composed of 3'and the capacitor 11, and is composed of two inductors L4 and L4 'and the capacitor C4. The capacitor 11 of the normal filter 94a on the upstream side also serves as the smoothing capacitor of the second DC power supply circuit 2. Further, the inductors L3 and L4 of one of the normal filters 94a and 94b are connected to the power supply line on the high voltage output side of the second DC power supply circuit 2, and the other inductors L3 'and L4' are connected to the power supply line on the low voltage output side. Each is arranged. The normal filter 94a on the front side has frequency characteristics that reduce noise in the operating frequency of the second DC power supply circuit 2, and the normal filter 94b on the rear side.
Are set to frequency characteristics that reduce noise in the operating frequency of the drive circuit 3, respectively.

In the power supply device of the fourth embodiment, the first noise filter 84 not only effectively reduces the noise generated from the first DC power supply circuit 1 and the high frequency power supply circuit 4, but also the second noise filter. The noise generated from the second DC power supply circuit 2 and the drive circuit 3 can be effectively reduced by 94. Moreover, in the fourth embodiment, in the normal filter 84a on the upstream side of the first noise filter 84, the inductors L1 and L1 ′ are provided on the first DC power supply circuit side 1 rather than the smoothing capacitor 10.
And the smoothing capacitor 1 is provided in the normal filter 94a on the upstream side of the second noise filter 94.
Inductors L3, L on the second DC power supply circuit side 2 than 1
3'is placed. With such a configuration, in particular, the first DC power supply circuit 1 to the smoothing capacitor 1
When the power supply line up to 0 is long or when the power supply line from the second DC power supply circuit 2 to the smoothing capacitor 11 is long, there is an advantage that the noise reduction effect can be further enhanced.

[Fifth Embodiment] FIG. 5 is a circuit configuration diagram of a power supply device according to a fifth embodiment of the present invention. The same reference numerals are given to the components corresponding to those of the first embodiment shown in FIG. Attach. The power supply device according to the fifth embodiment is an electrodeless discharge lamp 7 that operates efficiently at an operating frequency of several hundred kHz to several tens of MHz.
It is optimally used for a lighting device with a load.

The first DC power supply circuit 1 drives the high frequency power supply circuit 4, and here the switching element Q is used.
3, Q4, inductor L6, and diodes D1, D2
The step-up / step-down chopper circuit is composed of two stones, and a substantially rectangular wave signal is input to the gate-side input terminals of the switching elements Q3 and Q4.
Further, the second DC power supply circuit 2 drives the drive circuit 3, and in this case, it is configured by a step-down chewper circuit including a switching element Q5, an inductor L7, and a diode D3.

As the drive circuit 3, for example, an oscillation circuit using a crystal oscillator and an amplifier circuit are used, but the drive circuit 3 is not particularly limited to this, and any drive circuit that outputs a high frequency AC voltage can be used. Any circuit configuration may be used.

The high frequency power supply circuit 4 has a so-called class D amplifier circuit composed of two switching elements Q1 and Q2, an inductor L8, and a capacitor C6. Then, the high frequency voltage output from the drive circuit 4 is amplified by being turned on / off by the switching elements Q1 and Q2,
A substantially sinusoidal high frequency voltage is output through a series resonance circuit formed by the inductor L8 and the capacitor C6.

The matching circuit 5 is for matching the impedance between the high frequency power supply circuit 4 and the induction coil 6 to efficiently supply electric power to the electrodeless discharge lamp 7. In this case, the matching circuit 5 uses capacitors C7 and C8. It is configured.

In the power supply device according to the fifth embodiment, the first noise filter 85 is interposed between the output part of the first DC power supply circuit 1 and the input part of the high frequency power supply circuit 4, and A second noise filter 95 is interposed between the output part of the second DC power supply circuit 2 and the input part of the drive circuit 3. In this case, the first and second noise filters 85,
The insertion position of 95 is basically the same as in the case of the fourth embodiment, but in the fifth embodiment, the common mode filter is used instead of the normal filter as in the fourth embodiment. By using such a common mode filter as the first and second noise filters 85 and 95, common mode noise can be reduced.

In the first to fifth embodiments described above, the first
Although the DC power supply circuit 1 is a step-up chopper circuit, a step-up / step-down chopper circuit can also be used. Further, the second DC power supply circuit 2 is a step-down chopper circuit, but it is also possible to use a step-up chopper circuit or a step-up / step-down chopper circuit.

[0054]

The power supply device according to the present invention can effectively reduce the noises from the first DC power supply circuit, the second DC power supply circuit and the high frequency power supply circuit, respectively, and reduce the noise generated in the entire device. It becomes possible to suppress. Also,
It is possible to surely prevent the first DC power supply circuit and the high frequency power supply circuit from adversely affecting each other and the second DC power supply circuit and the drive circuit from causing a malfunction.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a power supply device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a power supply device according to a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram of a power supply device according to a third embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a power supply device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of a power supply device according to a fifth embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of a conventional power supply device.

[Explanation of symbols]

1 First DC power supply circuit 2 Second DC power supply circuit 3 drive circuit 4 High frequency power circuit 5 Matching circuit 6 induction coil 7 electrodeless discharge lamp 81-85 1st noise filter 93-95 second noise filter 10, 11 Smoothing capacitor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 41/24 H05B 41/24 NF Term (reference) 3K072 AA17 BA05 BB10 CA16 FA05 GA03 5H007 AA01 BB03 BB11 CA02 CB17 CB22 CC01 CC12 5H730 AA02 AA16 AS11 BB13 BB14 BB57 BB82 BB86 CC01 DD04 EE79 FG01 5H740 BA12 BB01 BB02 BB07 BB08 BB10 NN02

Claims (17)

[Claims] 1. A first and a second DC power supply circuit for outputting a DC voltage, and at least one switching element, wherein the DC voltage of the first DC power supply circuit is converted into a high-frequency AC voltage to load. A power supply device comprising: a high-frequency power supply circuit for supplying power; and a drive circuit for driving a switching element of the high-frequency power supply circuit by using a DC voltage of the second DC power supply circuit as a power supply, wherein an output section of the first DC power supply circuit is provided. A power supply device comprising a first noise filter having a plurality of stages between the input part of the high frequency power supply circuit and the first noise filter. 2. The power supply device according to claim 1, wherein a second noise filter having a plurality of stages is provided between the output section of the second DC power supply circuit and the input section of the drive circuit. 3. The power supply device according to claim 2, wherein at least one of the first noise filter and the second noise filter has different frequency characteristics for each stage. 4. At least one of the first noise filter and the second noise filter is configured by providing a normal filter on both the high-voltage output side and the low-voltage output side of the first or second DC power supply circuit. Claim 2 or Claim 3
The power supply device according to. 5. The power supply device according to claim 4, wherein the normal filter has the same frequency characteristic for each stage. 6. The first noise filter is the first noise filter.
Between the smoothing capacitor arranged at the output part of the DC power supply circuit and the high frequency power supply circuit, the second noise filter includes a smoothing capacitor arranged at the output part of the second DC power supply circuit. The power supply device according to any one of claims 2 to 5, which is provided between the drive circuit and an input portion of the drive circuit. 7. The power supply according to claim 2, wherein at least one of the first noise filter and the second noise filter is provided on the DC power supply circuit side with respect to the smoothing capacitor. apparatus. 8. The first noise filter is the first noise filter.
8. The power supply device according to claim 1, further comprising: a filter for attenuating the operating frequency noise of the DC power supply circuit, and a filter for reducing the operating frequency noise of the high frequency power supply circuit. 9. The second noise filter comprises:
9. The power supply device according to claim 2, further comprising: a filter for attenuating the operating frequency noise of the DC power supply circuit, and a filter for attenuating the operating frequency noise of the drive circuit. 10. At least one of the first and second DC power supply circuits has power supply lines on the high-voltage output side and the low-voltage output side thereof arranged substantially parallel to each other. The power supply device according to claim 1. 11. The low-voltage output-side power supply line of the second DC power supply circuit is connected to a low-voltage output-side power supply line of the first DC power supply circuit via a second noise filter as a first noise filter. Claim 2 thru | or Claim 1 connected.
0. The power supply device according to 0. 12. A filter for attenuating at least noise of an operating frequency of the high frequency power supply circuit between a junction of the power supply lines on the low voltage output side and an input section of the high frequency power supply circuit, and an operation of the high frequency power supply circuit. The power supply device according to claim 11, further comprising: a filter that attenuates noise of higher harmonic than the frequency. 13. The power bag according to claim 12, wherein the filter for attenuating noise at the operating frequency of the high frequency power supply circuit is arranged in the vicinity of the switching element of the high frequency power supply circuit. 14. The power supply device according to claim 1, wherein the first DC power supply circuit is a step-up / down chopper circuit, and the second DC power supply circuit is a step-down chopper circuit. 15. The power supply device according to claim 1, wherein operating frequencies of the high frequency power supply circuit and the drive circuit are several hundred kHz to several tens MHz. 16. A discharge lamp lighting device, comprising the power supply device according to claim 1, wherein the load is an electrodeless discharge lamp. 17. A first and second DC power supply circuit that outputs a DC voltage, and at least one switching element, wherein the DC voltage of the first DC power supply circuit is converted into a high-frequency AC voltage and used as a load. A high-frequency power supply circuit for supplying the high-frequency power supply circuit; and a drive circuit for driving a switching element of the high-frequency power supply circuit using the direct-current voltage of the second direct-current power supply circuit as a power supply, and an output section of the first direct-current power supply circuit and the high-frequency power supply. A first noise filter having a plurality of stages is provided between the input portion of the circuit and a second noise filter having a plurality of stages between the output portion of the second DC power supply circuit and the input portion of the drive circuit. At least one of the first noise filter and the second noise filter has a different frequency characteristic for each stage, and the first noise filter and the second noise filter have different frequency characteristics. At least one is configured by providing a normal filter on both the high-voltage output side and the low-voltage output side of the first or second DC power supply circuit, and at least one of the first and second DC power supply circuits,
The power supply lines on the high-voltage output side and the low-voltage output side are arranged substantially parallel to each other, the first DC power supply circuit is a step-up / down chopper circuit, and the second DC power supply circuit is a step-down chopper circuit. A discharge lamp lighting device, wherein an operating frequency of the circuit and the drive circuit is several hundred kHz to several tens MHz, and the load is an electrodeless discharge lamp.