JP2003163095A - Discharge lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which can rated lights each high pressure discharge lamp respectively according to a kind of each high pressure discharge lamp. <P>SOLUTION: The discharge lamp lighting device is provided with an alternating power source 1, a rectifying circuit 2 which rectifies the alternating current from the alternating power source 1, a power adjusting circuit having a switching element which adjusts power from the rectifying circuit 2, a smoothing circuit 4 which smooths the voltage from the power adjusting circuit, at least one or more inverter circuits 5 having switching elements, which are driven by output power of the smoothing circuit 4, a starting circuit 6 connected to the inverter circuit 5, and a high pressure discharge lamp 7 lighted by the starting circuit 6, wherein the power adjusting circuit comprises a plurality of power adjusting circuits 3a, 3b and 3c which are driven in such a way that the high pressure discharge lamp 7 is turned on at rated lighting by a change over unit 8 selectively according to the installed discharge lamp 7 class which is detected by the change over unit 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device, and in particular, it is capable of lighting a plurality of types of high-voltage discharge lamps having a rated power, and moreover, a high-voltage discharge lamp at a rated power of each high-pressure discharge lamp. The present invention relates to a discharge lamp lighting device capable of lighting a discharge lamp.

[0002]

2. Description of the Related Art As a conventional example of this type, there is, for example, the one disclosed in Japanese Patent Laid-Open No. 1-221893. In this discharge lamp lighting device, a target high-pressure discharge lamp is a plurality of fluorescent lamp groups in which a current (hereinafter, referred to as a high-pressure discharge lamp current) flowing through the high-pressure discharge lamp is substantially constant.
The above discharge lamp lighting device has a constant current characteristic such that the current flowing through each fluorescent lamp is constant.

In the case of this conventional example, in order to turn on all the fluorescent lamps at the rated power, it is premised that the currents flowing through the fluorescent lamps are all substantially constant.

Another example of the prior art is disclosed in Japanese Patent Publication No. 7-66864. In this discharge lamp lighting device, the target high-pressure discharge lamp is a plurality of fluorescent lamps having different rated powers, the difference in the starting voltage at the time of starting each fluorescent lamp is discriminated, and according to the type of each discriminated fluorescent lamp, Fluorescent lamps are constantly lit.

[0005]

[Patent Document 1] Japanese Patent Application Laid-Open No. 1-221
893 is based on the premise that the currents flowing in the respective fluorescent lamps are all substantially constant, but in the case of a discharge lamp lighting device in which the target high-pressure discharge lamp is a high-pressure discharge lamp, the rated power of the high-pressure discharge lamp is turned on. At times, the current flowing through the high-pressure discharge lamp (hereinafter referred to as the high-pressure discharge lamp current) often differs greatly.

Here, the CDM series, which is a high pressure discharge lamp manufactured by Philips, is taken as an example. The high-pressure discharge lamp current of this high-pressure discharge lamp is 0.5 A at CDM-T39W (rated power 39 W) and CDM-T70W (rated power 70 W, respectively).
It is 1A in W). As described above, when the high-pressure discharge lamp currents greatly differ from each other, JP-A 1-22218 is used.
The discharge lamp lighting device disclosed in Japanese Patent Laid-Open No. 93 cannot deal with this problem.

Further, in Japanese Patent Publication No. 7-66864, it is premised that the starting voltage of each fluorescent lamp at the time of starting is different, but in the case of a high pressure discharge lamp, the rated power of a plurality of types of high pressure discharge lamps is used. In many cases, the starting voltage at the time of starting is almost the same even if the values are different. Therefore, it is difficult to determine the type of high pressure discharge lamp by determining the difference in the starting voltage.

The present invention has been made in view of the above problems, and an object of the present invention is to discriminate a plurality of high pressure discharge lamps having different rated powers with one discharge lamp lighting device, and to detect each high voltage. An object of the present invention is to provide a discharge lamp lighting device capable of lighting a discharge lamp with rated power.

[0009]

A discharge lamp lighting device according to claim 1 has an AC power supply, a rectifier circuit for rectifying the voltage from the AC power supply, and a power for adjusting the power from the rectifier circuit. An adjusting circuit, a smoothing circuit that smoothes the voltage from the power adjusting circuit, at least one or more inverter circuits that have switching elements and use the output of the smoothing circuit as a power source, a starting circuit that is connected to the inverter circuit, and a starting circuit. In a discharge lamp lighting device equipped with a high pressure discharge lamp that is lit by, a plurality of power adjustment circuits and a type of the installed high pressure discharge lamp are detected, and the high pressure discharge lamp is detected according to the detected type of the high pressure discharge lamp. And a switching unit that selectively operates the power adjustment circuit so that the rated lighting is performed.

In such a discharge lamp lighting device, since the discharge lamp lighting device has a switching unit for selecting and operating a plurality of power adjusting circuits, each discharge lamp lighting device may be connected to each high pressure discharge lamp that may be connected. Correspondingly, the switching unit selects the power adjusting circuit so that each high-pressure discharge lamp is rated-lit, and each high-pressure discharge lamp is rated-lit according to the type of high-pressure discharge lamp.

A discharge lamp lighting device according to a second aspect of the present invention is the discharge lamp lighting device according to the first aspect, wherein a plurality of power adjusting circuits are all connected in parallel.

In such a discharge lamp lighting device, the combined power obtained by adding the output power of each power adjustment circuit becomes the output power of the power adjustment circuit, and by controlling this output power, the smoothing circuit, the inverter circuit, and the starter. The electric power supplied to the high-pressure discharge lamp via the circuit is controlled, and the high-pressure discharge lamp is rated-lighted according to the type of the high-pressure discharge lamp.

A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the second aspect, wherein the power adjustment circuit is DC.
-A DC converter.

Examples of the DC-DC converter include a step-up chopper circuit and a step-down chopper circuit. And in such a discharge lamp lighting device, DC-DC
By adding or subtracting the converter output voltage,
The power supplied to the high-pressure discharge lamp is controlled via the smoothing circuit, the inverter circuit, and the starting circuit, and each high-pressure discharge lamp is rated-lit according to the type of high-pressure discharge lamp.

A discharge lamp lighting device according to a fourth aspect of the present invention is the discharge lamp lighting device according to the third aspect, further comprising a first phase control section for controlling the phases of the switching elements of the DC-DC converter to be different from each other. It is characterized by becoming.

In such a discharge lamp lighting device, depending on the degree of phase difference of the switching elements, the DC-D
The output voltage of the C converter, that is, the magnitude of the ripple voltage of the smoothing circuit is controlled. Further, the power supplied to the high pressure discharge lamp is controlled via the inverter circuit and the starting circuit.
Further, the ripple current flowing in the smoothing circuit is suppressed more than in the case where all the switching elements have the same phase.

A discharge lamp lighting device according to a fifth aspect of the present invention is the discharge lamp lighting device according to the first aspect, wherein the plurality of inverter circuits and the starting circuit are controlled so that the phases of the switching elements of the inverter circuit are different from each other. And a phase control unit of.

In such a discharge lamp lighting device, the effective value of the combined voltage of the respective AC applied voltages is controlled by making the phases of the voltages applied to the high pressure discharge lamp different.

A discharge lamp lighting device according to a sixth aspect of the present invention is the discharge lamp lighting device according to the first aspect, further comprising a frequency controller for controlling different drive frequencies for driving the switching elements of the plurality of inverter circuits. It is characterized by becoming.

In such a discharge lamp lighting device, since the drive frequency of each inverter circuit is different, that is, the output power of each inverter circuit is different, a desired frequency is obtained by combining these output powers. Get power.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS.

The discharge lamp lighting device shown in FIG.
A rectifying circuit 2 for rectifying the voltage from the AC power supply 1, a plurality of power adjusting circuits 3a, 3b and 3c having switching elements for adjusting the power from the rectifying circuit 2, and power adjusting circuits 3a, 3b and 3c. Smoothing circuit 4 for smoothing the voltage from
An inverter circuit 5 having a switching element and using the output of the smoothing circuit 4 as a power source; a starting circuit 6 connected to the inverter circuit 5; a high-pressure discharge lamp 7 that is lit by the starting circuit 6; and a discharge lamp lighting device. A plurality of power adjustment circuits 3a, 3b
And a switching unit 8 for selecting and operating 3c.

The configuration, operation, etc. of each unit will be described in detail below.

The AC power supply 1 is a commercial AC power supply and has a voltage of, for example, 100V, 200V or 240V. The rectifier circuit 2 rectifies the AC voltage from the AC power supply 1 into a pulsating voltage, and is composed of, for example, a diode bridge. The power adjustment circuits 3a, 3b, and 3c are so-called DC-DC converters that convert the pulsating current voltage from the rectifier circuit 2 from a predetermined DC voltage to a predetermined DC voltage. All DC-DC converters are connected in parallel. As a specific circuit configuration of the DC-DC converter, for example, the step-down chopper circuit shown in FIG. 2 can be cited. This device includes a capacitor 9 for smoothing the pulsating voltage from the rectifier circuit 2 and a switching element 10 such as an FET.
1, a commutation diode 11, an inductor 12, and a PWM adjusting unit 13 that controls the switching element 10.

In this step-down chopper circuit, the capacitor 9
The operating frequency of the switching element 10 is controlled to be high or low, and the voltage of the smoothing circuit 4 is raised or lowered. Further, in such a step-down chopper circuit, the input power factor from the commercial AC power supply can be improved to almost 100%.
Since this is a well-known technique, detailed description is omitted, but the voltage of the smoothing circuit 4 at this time has a ripple. Other circuit configurations of the power adjusting circuits 3a, 3b, and 3c may be a boost chopper circuit, a buck-boost chopper circuit, or a polarity reversal type chopper circuit. In short, if it is a power adjustment circuit that converts one DC voltage into another DC voltage,
Any circuit configuration may be used.

In the present embodiment, the case where the number of power adjusting circuits is three has been shown, but the number of power adjusting circuits is not limited to three.

Next, the smoothing circuit 4 includes the power adjusting circuit 3
It smoothes the voltage output from a, 3b and 3c, and is composed of, for example, an electric field capacitor. The inverter circuit 5 converts the DC voltage from the smoothing circuit 4 into a rectangular wave voltage. As a concrete circuit configuration, for example, the full bridge inverter circuit shown in FIG. 1 of JP 2000-340384 A is used. Can be mentioned. In the present embodiment, the low frequency rectangular wave lighting method is considered as the lighting method of the high pressure discharge lamp 7, but the lighting method may be a direct current lighting method or a high frequency lighting method. The starting circuit 6 applies a pulse voltage of several kV peak to the high pressure discharge lamp 7 to start the high pressure discharge lamp 7. Depending on the type of high pressure discharge lamp, a pulse voltage of several tens of kV peak may be applied. Since this circuit is a well-known technique, a detailed description thereof will be omitted, but the circuit has a pulse transformer and the like and has excellent characteristics for starting the high-pressure discharge lamp 7 at a low frequency. The high-pressure discharge lamp 7 has a ceramic or glass container in which a discharge gas such as an inert gas (for example, argon, krypton), mercury (others, sodium, cadmium) vapor is sealed, and the excited mercury vapor has electrons. Ultraviolet rays are generated by the collision, and the ultraviolet rays irradiate the phosphor coated inside the glass bulb to generate visible light. In this embodiment, a metal halide lamp is considered as the high pressure discharge lamp 7, but the high pressure discharge lamp 7 may be any HID lamp such as a high pressure sodium lamp. Further, it is not limited to the high pressure discharge lamp, and may be a fluorescent lamp.

The switching unit 8 stores at least one power adjusting circuit operating, and stores the electric power which a certain high-pressure discharge lamp shows when the power adjusting circuit is operating. That is, if the high pressure discharge lamp connected to the discharge lamp lighting device is, for example, A or B, the high pressure discharge lamp power A1 and high voltage when the high pressure discharge lamp A is connected and only the DC-DC converter 3a is operated. Connect discharge lamp B and DC-DC
The power A2 of the high-pressure discharge lamp when only the converter 3a is operated and the high-pressure discharge lamp A are connected to connect the DC-DC converter 3
b of the high pressure discharge lamp when only b is operated, the high pressure discharge lamp B is connected, and the power of the high pressure discharge lamp B2 when only the DC-DC converter 3b is operated, and the high pressure discharge lamp A is connected to DC-DC All DC-D such as electric power AB1 of the high pressure discharge lamp when the DC converters 3a and 3b are simultaneously operated
The electric power in the combination of C converters is stored in advance. Then, the high-pressure discharge lamp voltage and the high-pressure discharge lamp current of the connected high-pressure discharge lamp are detected by 8a and 8b, respectively, and the power of the high-pressure discharge lamp is calculated and compared with the power stored in the switching unit 8. . Then, the switching unit 8 identifies the type of high pressure discharge lamp from the stored electric power,
In order to make the high-pressure discharge lamp rated lighting, the DC-DC converter is switched and selectively moved.

Next, the operation of this embodiment will be described.

When a metal halide lamp is considered as the high-pressure discharge lamp 7, the material of the glass bulb, the material of the phosphor coated on the inside of the glass bulb, the inert gas sealed in the glass container are the same, and the rated power is the same. There are many different items that have been commercialized. As an example, in the present embodiment, the rated power is 35W, 70W, 100W, 150W,
Take the 250W series.

In this embodiment, when only the DC-DC converter 3a is operated, the rated power of 35 W can be turned on, and when only the DC-DC converter 3b is operated, the rated power can be obtained. It is assumed that the power of 70 W can be rated for lighting, and that the power of 150 W can be rated for lighting when the DC-DC converter 3c is operated. Also, DC-DC
When the converter 3a and the DC-DC converter 3b are operated at the same time, the voltage of the smoothing circuit 4, that is, the input voltage to the inverter circuit 5 can be changed. With this, the rated power of 100 W is turned on. Suppose you can do it. Below, for example, rated power is 250W
In this case, the rated lighting can be performed by selectively operating any of the DC-DC converters 3a, 3b and 3c. Further, after the power is turned on, only one specific DC-DC converter (for example, DC-DC converter 3a) operates.

Rated power is 35W, 70W, 100W, 1
When either the 50 W or 250 W high pressure discharge lamp is connected to the discharge lamp lighting device, as described above, the high pressure discharge lamp voltage and the high pressure discharge lamp current of the high pressure discharge lamp are switched respectively.
It is detected by 8a and 8b connected to, and the electric power of the high pressure discharge lamp is calculated. Then, the electric power calculated by the switching unit 8 and the electric power stored in advance in the switching unit 8 are compared and referenced.

For example, when a high pressure discharge lamp having a rated voltage of 100 W is connected to the discharge lamp lighting device and the power is turned on, only the DC-DC converter 3a operates as described above.
At this time, the electric power calculated by the switching unit 8 indicates electric power X that is not 100 W, but when the electric power X is calculated, the high-voltage discharge lamp has a rated voltage of 100 W by the electric power stored in advance in the switching unit 8. The switching unit 8 selectively operates the DC-DC converter 3a and the DC-DC converter 3b to turn on the rated voltage of 100W at 100W.

In this way, the electric power of the high-pressure discharge lamp to which the switching unit 8 is connected is calculated, the kind of the high-pressure discharge lamp is specified by referring to the electric power stored in advance, and the high-pressure discharge lamp is lit at the rated lighting. Let them do it. In the present embodiment, the switching unit 8
Although the electric power of each high pressure discharge lamp is stored in the above, of course, the current and voltage of each high pressure discharge lamp may be stored and the type of the high pressure discharge lamp may be specified from the current or voltage. . Further, each illuminance is stored in the switching unit 8, and at the same time, a Cds cell is provided near the high pressure discharge lamp.
The DC-DC converter is selectively operated according to the illuminance,
Each high-pressure discharge lamp may be rated for lighting.

As for the circuit configuration, the capacitor C9 shown in FIG. 2 is shared by all DC-DC converters shown in FIG.
The capacitor C14 shown in FIG. If the capacitor 14 is shared, the cost of the discharge lamp lighting device can be reduced.

In the present embodiment, the predetermined power data stored in the switching unit 8 and the actually calculated power are compared and referred to, and the high pressure discharge lamp is turned on by the rated power. D for each connected high-pressure discharge lamp
The C-DC converter may be selectively operated. In this case, the high voltage discharge lamp voltage detection 8a and the high voltage discharge lamp current detection 8b are unnecessary, and the circuits that configure them are unnecessary, and the number of parts can be reduced.

The second embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

The discharge lamp lighting device shown in FIG. 4 is the same as the discharge lamp lighting device shown in FIG. 1 for controlling the phase of the gate voltage of the switching elements 10a, 10b (not shown) and 10c (not shown) of the DC-DC converter. Phase control unit 1
5 is added. And in the present embodiment,
The output voltage of the smoothing circuit 4 is Vdc. Other circuit configurations are the same as those in FIG.

The configuration, operation, etc. of the first phase controller 15 will be described in detail below.

The first phase control section 15 controls the phases of the gate voltages of the switching elements 10a, 10b and 10c of the DC-DC converter as shown in FIG. 5 to make them different from each other. Is. DC-D
When the C converters 3a, 3b and 3c operate independently, each gate voltage 16a, 16b and 16c
Corresponding to the smoothing circuit 4, the output voltage Vdc has voltage waveforms having different phases as shown in 17a, 17b and 17c, respectively, as shown in FIG. When the DC-DC converters 3a, 3b and 3c operate simultaneously, the smoothing circuit 4
Of the output voltage Vdc of FIG. 6 is 17a, 17b and 17c.
Is a combined voltage such as 17d in FIG. Here, the magnitude of the output voltage Vdc of the smoothing circuit 4 can be controlled by controlling the degree of phase difference between the gate voltages 16a, 16b, and 16c.
Further, the ripple voltage of the output voltage Vdc of the smoothing circuit 4 can be reduced by combining 17a, 17b and 17c in FIG. 6, and the capacitance of the electric field capacitor constituting the smoothing circuit 4 can be reduced.

Next, the operation of this embodiment will be described.

In the present embodiment, the DC-DC converters 3a, 3b and 3c are all operating at the same time. Also in this embodiment, as in the first embodiment, the high-pressure discharge lamp 7 has a rated power of 35 W, 70 W, 1
Consider a series of 00W, 150W, 250W.

Rated power is 35W, 70W, 100W, 1
When either the high-pressure discharge lamp of 50 W or 250 W is connected to the discharge lamp lighting device, the high-voltage discharge lamp voltage and the high-pressure discharge lamp current of the high-pressure discharge lamp are detected by 8 a and 8 b, respectively, and the high-voltage discharge lamp is switched by the switching unit 8. Calculate the power of the light. And
By the method shown in the first embodiment, the type of the high pressure discharge lamp is discriminated and a control signal is transmitted to the first phase controller 15. Then, the first phase control unit 15 controls the degree of phase difference between the gate voltages 16a, 16b, and 16c so that the high-pressure discharge lamp is ratedly lit, and the output voltage Vdc of the smoothing circuit 4, that is, the inverter. Controls the input voltage to the circuit. Of course, the rated power is 35 W, 70 W, 100 W, 150 only by controlling the phase of each gate voltage.
If all the high-pressure discharge lamps of W and 250 W cannot be rated-lit, D as shown in the first embodiment
The C-DC converter may be selectively movable.

Further, in the present embodiment, it is considered that each high-pressure discharge lamp is ratedly lit by controlling the input voltage to the inverter circuit, but in addition, one discharge lamp lighting device has a switching element. Even if a plurality of inverter circuits and a second phase control unit that controls the phase of each switching element are provided and the phase of the gate voltage of each switching element is controlled, the output of the high pressure discharge lamp 7 can be varied. . That is, similarly to the above, first, the switching unit 8 determines the type of the high-pressure discharge lamp, and the switching unit 8 transmits the control signal to the second phase control unit, whereby the gate voltage of each switching element is changed. The phase is controlled and the high pressure discharge lamp is turned on at the rated lighting.

Alternatively, even if one discharge lamp lighting device is provided with a plurality of inverter circuits having switching elements and a frequency control section for controlling the driving frequency of each switching element, the driving frequency of each switching element is controlled. The output of the high pressure discharge lamp 7 can be changed. That is, similarly to the above, first, the switching unit 8 determines the type of high-pressure discharge lamp, and the switching unit 8 transmits a control signal to the frequency control unit to control the drive frequency of each switching element, The high-pressure discharge lamp is rated-lit.

The circuit configuration, operation, effect, etc., not particularly mentioned in the above description, are the same as those in the first embodiment.

[0047]

In the discharge lamp lighting device according to the first aspect of the present invention, since the discharge lamp lighting device has a switching unit for selecting and operating a plurality of power adjusting circuits, each high voltage that may be connected. Depending on the discharge lamp, the switching unit may select the power adjustment circuit so that each high-pressure discharge lamp is rated-lighted, and each high-pressure discharge lamp can be rated-lighted according to the type of high-pressure discharge lamp.

The discharge lamp lighting device according to a second aspect of the present invention is the discharge lamp lighting device according to the first aspect, in which all of the plurality of power adjusting circuits are connected in parallel, so that the output power of each power adjusting circuit is added and combined. The power becomes the output power of the power adjustment circuit, and by controlling this output power, the power supplied to the high-pressure discharge lamp via the smoothing circuit, the inverter circuit and the starting circuit is controlled, depending on the type of high-pressure discharge lamp. Each high-pressure discharge lamp can be turned on by its rated value.

A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the second aspect, wherein the power adjusting circuit is DC.
Since it is a DC converter, by adding or subtracting the output voltage of the DC-DC converter, the power supplied to the high pressure discharge lamp via the smoothing circuit, the inverter circuit and the starting circuit is controlled, and the type of high pressure discharge lamp According to the above, each high pressure discharge lamp can be turned on at its rated value.

A discharge lamp lighting device according to a fourth aspect is the discharge lamp lighting device according to the third aspect, further comprising a first phase control section for controlling the phases of the switching elements of the DC-DC converter to be different from each other. Therefore, the output voltage of the DC-DC converter, that is, the magnitude of the ripple voltage of the smoothing circuit can be controlled by the degree of phase difference of the switching element, and the power supplied to the high pressure discharge lamp via the inverter circuit and the starting circuit can be controlled. You can control. That is, each high-pressure discharge lamp can be rated-lit according to the type of high-pressure discharge lamp. Further, the ripple current flowing in the smoothing circuit can be made smaller than that in the case where all the switching elements have the same phase, and the size of the smoothing capacitor forming the smoothing circuit can be made smaller.

A discharge lamp lighting device according to a fifth aspect of the present invention is the discharge lamp lighting device according to the first aspect, wherein the plurality of inverter circuits and the starting circuit are controlled so that the phases of the switching elements of the inverter circuit are different from each other. The phase control unit of 1 is provided, so that the effective value of the combined voltage of the AC applied voltages can be controlled by making the phases of the voltages applied to the high-pressure discharge lamp different. That is, each high-pressure discharge lamp can be rated-lit according to the type of high-pressure discharge lamp.

A discharge lamp lighting device according to a sixth aspect of the present invention is the discharge lamp lighting device according to the first aspect, further comprising a frequency control unit for controlling different drive frequencies for driving the switching elements of the plurality of inverter circuits. Because
Since the output powers of the respective inverter circuits are different from each other, by combining the output powers, the high pressure discharge lamps can be rated-lit according to the type of the high pressure discharge lamp.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment.

FIG. 2 is a circuit diagram showing the DC-DC converter of the first embodiment.

FIG. 3 is another circuit diagram showing the first embodiment.

FIG. 4 is a circuit diagram showing a second embodiment.

FIG. 5 is a waveform diagram showing the voltage of each gate in the second embodiment.

FIG. 6 is a waveform diagram showing a voltage of Vdc in the second embodiment.

[Explanation of symbols]

1 AC power supply 2 rectifier circuit 3a, 3b, 3c Power adjustment circuit 4 Smoothing circuit 5 Inverter circuit 6 Starting circuit 7 High-pressure discharge lamp 8 switching unit 15 First Phase Control Unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Minoru Maehara             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Yutaka Iwahori             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Toshiro Nakamura             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Takeshi Kamoi             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F term (reference) 3K072 AA11 AA13 AB09 AC11 AC20                       BA05 BB10 CA16 DE02 DE04                       DE07 GB01 HA06 HA10 HB05

Claims (6)

[Claims] 1. An AC power supply, a rectifier circuit that rectifies the voltage from the AC power supply, a power adjustment circuit that has a switching element and adjusts the power from the rectification circuit, and a smoothing circuit that smoothes the voltage from the power adjustment circuit. And a discharge lamp lighting device including at least one or more inverter circuits having switching elements and using the output of the smoothing circuit as a power source, a starting circuit connected to the inverter circuit, and a high-pressure discharge lamp that is lit by the starting circuit. In the above, switching to detect a plurality of types of high-pressure discharge lamps installed and a plurality of types of high-pressure discharge lamps and selectively operate the power adjustment circuits so that the high-pressure discharge lamps are rated-lighted according to the detected types of high-pressure discharge lamps And a discharge lamp lighting device. 2. The discharge lamp lighting device according to claim 1, wherein a plurality of power adjusting circuits are all connected in parallel. 3. The discharge lamp lighting device according to claim 2, wherein the power adjustment circuit is a DC-DC converter. 4. The discharge lamp lighting device according to claim 3, further comprising a first phase control unit that controls the phases of the switching elements of the DC-DC converter to be different from each other. 5. A plurality of inverter circuits and a starting circuit,
The discharge lamp lighting device according to claim 1, further comprising a second phase control unit that controls the phases of the switching elements of the inverter circuit so as to be different from each other. 6. A frequency control unit for controlling different drive frequencies for driving the switching elements of the plurality of inverter circuits, respectively.
The discharge lamp lighting device described.