JPH0620788A - Power supply device and discharge lamp lighting device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a power supply device and the like in which distortion of input current is small. A rectifier 1 for rectifying an AC power supply voltage, an inverter 3 to which an output of the rectifier 1 is input, and an output voltage of the rectifier 1 provided in series with the output of the rectifier 1. A DC power supply for adding a DC voltage and supplying the same to the inverter, and a filter device 6 provided on the input side or the output side of the rectifier 1 are provided, and the DC power supply is a current input to the inverter 3. When the peak value of the waveform is A, the peak value B of the current supplied from the DC power supply is set to a value of 0.3A ≧ B, and the filter device 6 is at least the 7th order of the frequency of the AC power supply 2. A power supply device characterized by being effective against harmonics.

Description

Detailed Description of the Invention

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device and a discharge lamp lighting device capable of reducing distortion of an input current waveform.

[0003]

2. Description of the Related Art Conventionally, in order to rectify an AC voltage to obtain a smoothed DC voltage, it is common to provide a smoothing capacitor on the output side of a rectifier, but the input current waveform is There is a problem that there are many distortion and harmonic components.

A so-called partial smoothing circuit has recently been proposed. In this method, a pseudo smoothing voltage filling the valley portion is obtained by supplying power from the auxiliary DC power source to the valley portion of the AC power source.

[0005]

However, even in this case, the input current is distorted, and the problem of harmonic components has not been solved.

The present invention has been made to solve the above problems, and an object thereof is to provide a power supply device capable of reducing the problem of harmonic components while obtaining a smoothed DC voltage. It is a thing.

It is another object of the present invention to provide a discharge lamp lighting device capable of reducing the problem of harmonic components while lighting a discharge lamp with an AC voltage which is close to a rectangular wave and increasing the luminous efficiency.

[Structure of Invention]

[0009]

According to a first aspect of the present invention, there is provided a rectifying device for rectifying an AC power supply voltage, an inverter receiving an output of the rectifying device, and an output of the rectifying device. A DC power supply that is provided in series and adds a DC voltage to the output voltage of the rectifying device to supply the inverter, and a filter device provided on the input side or the output side of the rectifying device, and The DC power source is the inverter
When the peak value of the current waveform input to the controller is A, the peak value B of the current supplied from the DC power source is set to a value of 0.3A ≧ B, and the filter device is at least the AC. A power supply device characterized by being effective against the seventh harmonic of the frequency of the power supply.

According to a second aspect of the present invention, the discharge lamp is provided between the discharge lamp and the AC power supply, and the current supplied to the discharge lamp has a sharp rise when the polarity of the AC power supply is reversed. An energy storage element having a waveform and a filter device provided on the AC power source side of the energy storage element are provided, and the energy storage element has a waveform value C of a current supplied to the discharge lamp. The current value D of the steep rising portion is controlled to be 0.3C ≧ D, and the filter device is effective for at least the seventh harmonic of the frequency of the AC power supply. Is a discharge lamp lighting device.

[0011]

According to the first aspect of the present invention, a relatively smoothed DC voltage can be obtained by adding the voltage of the DC power supply to the rectified voltage. Since the amount of addition by the DC power supply is limited, the distortion of the input current from the AC power supply is made small. Therefore, the problem of harmonics can be reduced. Also, the filter can be miniaturized.

According to the second aspect of the present invention, the energy storage element makes the current supplied from the AC power source to the discharge lamp have a sharp rise when the polarity is reversed. Therefore, the discharge lamp continuously lights up without being re-ignited, and the energy for the re-ignition becomes unnecessary, so that the luminous efficiency is high. Moreover, since the current value D at the steep rising portion is controlled so as to be 0.3C ≧ D, the problem of harmonics can be reduced. Also, the filter can be miniaturized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. A rectifier 1 rectifies the voltage of the AC power supply 2. An inverter 3 receives the output of the rectifying device 1 and outputs a high frequency voltage of, for example, several KHz or more. Reference numeral 4 denotes a load such as a discharge lamp.

A DC power source 5 is provided in series with the output of the rectifying device 1 and adds the output voltage to the output of the rectifying device to supply it to the inverter. The DC power supply 5 of this embodiment is charged by the output of the inverter 3. That is, the output transformer T of the inverter 3
The output of the winding 51 provided in the
I am trying to charge it.

A filter device 6 is provided on the input side or output side of the rectifying device 1. In this embodiment, it is provided on the input side. The filter device 6 is designed to be effective for at least the seventh harmonic of the frequency of the AC power supply.

Next, the operation of this embodiment will be described. When the AC power supply 2 is turned on, the rectifier 1 outputs a rectified voltage,
The inverter 3 converts this rectified voltage into a high frequency voltage.
Therefore, since the DC power source 5 is charged by the output of the inverter 3, the current shown in FIG. 3 is input to the inverter 3 thereafter. When the peak value of the current waveform is A, the peak value B of the current flowing from the DC power source 5 is set so that the capacity of the DC power source satisfies the relation of 0.3A ≧ B. .

Another embodiment will be described with reference to FIG. In the present embodiment, the DC power supply 5'is modified, and a switching element 54 and an inductor 55 are added to charge the capacitor 56 by the chopper action. Since the operation of this embodiment is easily understood,
The description is omitted.

Further, another embodiment will be described with reference to FIG. Reference numeral 10 is an AC power supply, 11 is a discharge lamp energized by the AC power supply 10, and 13 is the AC power supply and the discharge lamp 1.
An energy storage element interposed between the energy storage element 1 and the reference numeral 1 is a filter device provided on the AC power source side of the energy storage element 13.

The energy storage element 13 is a simulated inductor as disclosed, for example, in Japanese Examined Patent Publication No. 28792/1993, which steeply changes the current supplied to the discharge lamp 11 when the polarity of the AC power source is reversed. The waveform has a sharp rise.

Further, the filter 14 device is designed to be effective for at least the seventh harmonic of the frequency of the AC power supply.

In this embodiment, when the AC power supply 10 is turned on, power is supplied to the discharge lamp 11 via the filter device 14 and the energy storage element 13, and the discharge lamp 11 is turned on.
At this time, by controlling the switching of the energy storage element 13, the lamp current waveform of the discharge lamp 11 has a steep rise at the time of polarity reversal as shown in FIG. Further, when the peak value of the lamp current waveform is C, the peak value D of the steep rising portion is
Controls the switching of the energy storage element 13 so as to satisfy the relationship of 0.3C ≧ D.

The energy storage element may be configured as shown in FIG. 6 or may be a simulated capacitor.

Further, as shown in FIG. 7 or FIG.
Input power factor by combining the phase-advancing type energy storage element 13-1 and the lag-phase type energy storage element 13-2, or by combining the phase-advancing capacitor 16 and the lag-phase type energy storage element 13-3. May be increased.

[0024]

As described above, according to the first aspect of the invention, a relatively smoothed DC voltage can be obtained by adding the voltage of the DC power supply to the rectified voltage.
And since the amount to be added by the DC power supply is limited,
The distortion of the input current from the AC power supply can be reduced, and therefore the problem of harmonics can be reduced. Also, the filter can be miniaturized.

According to the second aspect of the invention, the energy storage element makes the current supplied from the AC power source to the discharge lamp have a steep rise when the polarity is reversed. Therefore, the discharge lamp continuously lights up without being re-ignited, and the energy for the re-ignition becomes unnecessary, so that the luminous efficiency is high. Moreover, since the current value D at the steep rising portion is controlled to be 0.3C ≧ D, the problem of harmonics can be reduced, and the filter can be downsized.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment corresponding to the invention described in claim 1.

FIG. 2 is a circuit diagram showing another embodiment corresponding to claim 1.

FIG. 3 is a waveform diagram showing the operation of FIG.

FIG. 4 is a circuit diagram showing an embodiment corresponding to the invention described in claim 2.

FIG. 5 is a waveform chart showing the operation of FIG.

FIG. 6 is a circuit diagram showing another embodiment corresponding to the invention described in claim 2.

FIG. 7 is a circuit diagram showing a usage example of the invention described in claim 2.

FIG. 8 is a circuit diagram showing another example of use of the invention described in claim 2.

[Explanation of symbols]

1 ... Rectifier, 3 ... Inverter, 5 ... DC power supply, 6, 1
4 ... Filter device, 11 ... Discharge lamp, 13, 13-1, 13
-2, 13-3 ... Energy storage element

Claims (2)

[Claims] 1. A rectifying device for rectifying an AC power supply voltage; an inverter for receiving an output of the rectifying device; a direct current for an output voltage of the rectifying device, which is provided in series with an output of the rectifying device. A DC power supply for adding a voltage and supplying the same to the inverter; and a filter device provided on the input side or the output side of the rectifier; the DC power supply is a current input to the inverter. When the peak value of the waveform is A, the peak value B of the current supplied from the DC power supply is set to a value of 0.3A ≧ B, and the filter device is at least the seventh frequency of the frequency of the AC power supply. A power supply device characterized by being effective against the second harmonic. 2. A discharge lamp; and an energy storage element which is provided between the discharge lamp and an AC power supply, and which makes a current supplied to the discharge lamp a waveform having a steep rise when the polarity of the AC power supply is reversed. A filter device provided on the side of the AC power source of the energy storage element; the energy storage element, when the waveform value of the current supplied to the discharge lamp is C; The current value D is controlled to be 0.3C ≧ D, and the filter device is effective for at least the seventh harmonic of the frequency of the AC power supply. Discharge lamp lighting device.