JP3393477B2 - Power supply device, discharge lamp lighting device and lighting device - Google Patents

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, a discharge lamp lighting device and a lighting device for reducing ripples.

[0002]

2. Description of the Related Art As a conventional discharge lamp lighting device of this type, for example, the structure shown in FIG. 1 is known.

In the circuit shown in FIG. 1 , a commercial AC power source E is connected to an input terminal of a full-wave rectifier circuit 1, and an output terminal of the full-wave rectifier circuit 1 is connected to a smoothing capacitor C1. A diode D1 as a power factor improving switching means is connected to the positive electrode of the full-wave rectifier circuit 1.

Further, a capacitor via a diode D1
A series circuit of a capacitor C2 as a capacitive element, a capacitor C3, and an inrush current preventing inductor L1 is connected in parallel to C1.

The inverter circuit 2 is connected between both terminals of the capacitor C2. This inverter circuit 2
Is connected between the terminals of the full-wave rectifier circuit 1 via the diode D1 and the series circuit of the input winding Tr1 of the inverter transformer Tr and the oscillation switch Q1 as the oscillation switching means. A diode D2 and a resonance capacitor C4 are connected in parallel between the children, and the oscillation switch Q1 is controlled by the control circuit 3.

Furthermore, the output winding of the inverter transformer Tr
One end of each of the filaments FLa and FLb of the discharge lamp FL is connected to Tr2, and a starting capacitor C5 is connected to the other end of each of the filaments FLa and FLb.

When the control circuit 3 oscillates at a constant frequency, for example, a frequency of about 45 kHz, and the oscillation switch Q1 is on, the inverter transformer
Charge the input winding Tr1 of Tr, and on the contrary, switch for oscillation Q1
When is off, the capacitor C4 is charged / discharged, or a current flows through the diode D2.

First, the voltage of the commercial AC power source E is full-wave rectified by the full-wave rectifier circuit 1 to charge the capacitor C1. When the cathode side potential is lower than the anode side potential of the diode D1, that is, the voltage rectified by the full-wave rectification circuit 1,
When the voltage of the capacitor C2 is low, the voltage of the full-wave rectifier circuit 1 is input to the input winding Tr1 of the inverter transformer Tr and the resonance circuit of the capacitor C4 via the diode D1.
Current flows from the capacitor to the capacitor C4. When this current is reversed and the current in the input winding Tr1 and capacitor C4 is discharged, the regenerative power causes the capacitor C4 and input winding to discharge.
A current flows in the resonant circuit of Tr1 and capacitor C2, charging capacitor C2 and capacitor C3.

On the other hand, when the potential on the cathode side is higher than the potential on the anode side of the diode D1, that is, when the voltage of the capacitor C2 is higher than the voltage rectified by the full-wave rectification circuit 1, the full-wave rectification circuit 1 The voltage charges capacitor C1. Then, the charging currents of the capacitors C2 and C3 are supplied to the resonance circuit with the input winding Tr1 of the inverter transformer Tr, the capacitor C4, etc., and the current flows from the input winding Tr1 to the capacitor C4. The capacity of the capacitor C2 is about the ON time of the oscillation switch Q1 and is instantly discharged. Also, when this current is inverted and the current in the input winding Tr1 and capacitor C4 is discharged,
Regenerative power causes a current to flow in the resonance circuit of capacitor C4, input winding Tr1 and capacitor C2, which causes resonance operation to charge capacitors C2 and C3, and the voltage is boosted and supplied to input winding Tr1.

The output winding of the inverter transformer Tr
The discharge lamp FL is lit at high frequency by inducing high-frequency alternating current in Tr2.

Thus, the power factor is improved by the above operation.

[0012]

However, the above-mentioned diagram
In the conventional example shown in FIG. 1, when the voltage of the commercial AC power supply E is close to 0 V, the turn-on time of the diode D1 is shortened, and the input winding Tr1, the capacitor C2, the capacitor C3, and the capacitor C4 located on the inverter side of the diode D1. And the time that the resonant circuit such as the inductor L1 operates becomes longer,
As shown in (a), when the voltage of the commercial AC power supply E is near 0 V, the voltage induced in the output winding Tr2 rises, and
As shown in (b), the lamp current IL flowing through the discharge lamp FL becomes large, and in particular, the voltage of the commercial AC power source E becomes 0V.
A ripple current is generated in the area where

On the other hand, the power supply voltage is not a sine wave, but the one shown in FIG.
As shown in (a), when the rectangular wave is used, the diode D1 performs the switching operation only based on the high frequency of the inverter circuit 2, and therefore the lamp current IL flowing through the discharge lamp FL.
Does not include the ripple current and becomes stable with a constant current value.

However, there is a problem in that the cost of the device is increased in order to obtain the rectangular wave voltage as shown in FIG. 7 (a).

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply device, a discharge lamp lighting device, and a lighting device that eliminate ripples without using a rectangular wave voltage.

[0016]

According to a first aspect of the present invention, there is provided a power supply device comprising: a full-wave rectifier circuit for full-wave rectifying an AC power supply voltage; and a power factor improving switching means for turning on / off the output of the full-wave rectifier circuit. , and a capacitive element connected to the full-wave rectifying circuit through a switching means for the power factor correction, connected capacitor and b in parallel for this capacitive element
Inductor series circuit, the capacitive element and the capacitor.
Said power factor improving switching means based on the output of the regeneration and the full-wave rectifier circuit of the reactive power with being connected to the series circuit of the capacitor and the inductor to form a resonant circuit and the capacitive element and the capacitor switching at a high frequency, the oscillation An inverter circuit having a switching means for switching the power factor, and when the switching means for improving the power factor is on, the full-wave rectifier circuit causes the resonance circuit to generate a resonance current.
Supplies power before Symbol inverter circuit <br/> both the charges the capacitive element and the capacitor flows, Oyo the capacitive element during off of the power factor improving switching device
And the capacitor via the inductor to the resonant circuit.
In a power supply device for supplying electric power to the inverter circuit by flowing a resonance current , the oscillation switching means is frequency-modulated and the output voltage of the inverter circuit is lowered in a portion where the output voltage of the full-wave rectifier circuit is low . The frequency is continuously changed in the direction, and the output voltage of the inverter circuit is increased in the portion where the output voltage of the full-wave rectifier circuit is high.
The frequency is continuously changed in the direction of increasing .

According to another aspect of the power supply device of the present invention, a full-wave rectifier circuit for full-wave rectifying the voltage of the AC power source, a power factor improving switching means for turning on / off the output of the full wave rectifier circuit, and a power factor improving switch. and a capacitive element connected to the full-wave rectifying circuit through the switching means, for this capacitive element
Series connection of capacitors and inductors connected in parallel
Path, the capacitive element and the capacitor and
Are connected to a series circuit of the inductor the capacitive element and con
A resonant circuit that forms a resonance circuit with a capacitor , switches the power factor improving switching means at a high frequency based on the regeneration of the reactive power and the output of the full-wave rectifier circuit, and includes an inverter circuit having an oscillating switching means. When the rate improving switching means is turned on, a resonance current flows from the full-wave rectification circuit through the resonance circuit to cause the capacitance.
Supplies power before Symbol inverter circuit together Charging sexual element and a capacitor, through said capacitive element and the inductor during the off of the power factor improving switching device
Resonant current flows from the capacitor
In the power supply device for supplying power to the inverter circuit, the oscillation switching means is ON-width controlled, and in the portion where the output voltage of the full-wave rectifier circuit is low, the output voltage of the inverter circuit is continuously reduced. The ON width is changed, and the ON width is continuously changed in the direction in which the output voltage of the inverter circuit is increased in the portion where the output voltage of the full-wave rectification circuit is high.

According to another aspect of the power supply device of the present invention, a full-wave rectifying circuit for full-wave rectifying the voltage of the AC power supply, a power factor improving switching means for turning on and off the output of the full wave rectifying circuit, and a power factor improving circuit. and a capacitive element connected to the full-wave rectifying circuit through the switching means, for this capacitive element
Series connection of capacitors and inductors connected in parallel
Path, the capacitive element and the capacitor and
Are connected to a series circuit of the inductor the capacitive element and con
A resonant circuit that forms a resonance circuit with a capacitor , switches the power factor improving switching means at a high frequency based on the regeneration of the reactive power and the output of the full-wave rectifier circuit, and includes an inverter circuit having an oscillating switching means. When the rate improving switching means is turned on, a resonance current flows from the full-wave rectification circuit through the resonance circuit to cause the capacitance.
Supplies power before Symbol inverter circuit together Charging sexual element and a capacitor, through said capacitive element and the inductor during the off of the power factor improving switching device
Resonant current flows from the capacitor
In the power supply device for supplying power to the inverter circuit, the oscillation switching means is frequency-modulated and ON-width controlled, and in the portion where the output voltage of the full-wave rectifier circuit is low, the output voltage of the inverter circuit is reduced. The frequency and the ON width are continuously changed, and the output of the inverter circuit is output in a portion where the output voltage of the full-wave rectifier circuit is high.
The frequency and the on-width are continuously changed in the direction of increasing the voltage .

According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device in which a discharge lamp is connected to the inverter circuit of the power supply device according to any of the first to third aspects.

According to a fifth aspect of the present invention, there is provided a discharge lamp according to the fourth aspect, which is provided in a fixture body.

[0021]

In the power supply device according to the present invention, the voltage of the AC power supply is full-wave rectified by the full-wave rectification circuit, the reactive power of the inverter circuit is regenerated, and the power factor correction switching is performed at a high frequency based on the output of the full-wave rectification circuit. Control means, capacitive elements , capacitors
When the switching circuit for power factor improvement is switched at a high frequency by the resonance circuit of the sensor and the inverter circuit to improve the power factor, the voltage of the full-wave rectifier circuit changes with time, so the switching device for power factor improvement turns on. The output increases when the output from the full-wave rectifier circuit is low,
Since the output decreases in the part where the output from the full-wave rectification circuit is high, the resonance conditions of the capacitive element and the resonance circuit of the inverter circuit are different, and the output of the inverter circuit is not stable, but the oscillation switching means is frequency modulation controlled. , In the part where the output voltage of the full-wave rectifier circuit is low , the frequency is continuously changed to lower the output voltage of the inverter circuit,
Since the output voltage is higher portions of the full-wave rectifier circuit continuously changing the frequency in a direction to increase the output voltage of the inverter circuit regardless of the output voltage from the full-wave rectifier circuit, the input
Even if the force is a pseudo sine wave, the output of the inverter circuit can be made constant and the ripple current can be eliminated .

According to another aspect of the power supply device of the present invention, the voltage of the AC power source is full-wave rectified by the full-wave rectification circuit, and the power factor correction switching is performed at high frequency based on the regeneration of the reactive power of the inverter circuit and the output of the full-wave rectification circuit. Control means, capacitive elements ,
When the power factor improving switching means is switched at high frequency by the resonance circuit of the capacitor and the inverter circuit to improve the power factor, the voltage of the full-wave rectifier circuit changes with time, so the power factor improving switching means is turned on. The output increases when the output from the full-wave rectifier circuit is low, and the output decreases when the output from the full-wave rectifier circuit is high.Therefore, the resonance conditions of the resonant circuit of the capacitive element and the inverter circuit are different, Although the output of the inverter circuit is not stable, the oscillation switching means is ON-width controlled, and in the portion where the output voltage of the full-wave rectifier circuit is low , the ON-width is continuously changed in the direction of lowering the output voltage of the inverter circuit. since the output voltage is higher portions of the wave rectifier circuit continuously varying the oN width in a direction to increase the output voltage of the inverter circuit, full-wave rectification times Regardless of the output voltage from the input
Even if is a pseudo sine wave, the output of the inverter circuit can be made constant and the ripple current can be eliminated .

According to another aspect of the power supply device of the present invention, the voltage of the AC power supply is full-wave rectified by the full-wave rectification circuit, and the power factor correction switching is performed at high frequency based on the regeneration of the reactive power of the inverter circuit and the output of the full-wave rectification circuit. Control means, capacitive elements ,
When the power factor improving switching means is switched at high frequency by the resonance circuit of the capacitor and the inverter circuit to improve the power factor, the voltage of the full-wave rectifier circuit changes with time, so the power factor improving switching means is turned on. The output increases when the output from the full-wave rectifier circuit is low, and the output decreases when the output from the full-wave rectifier circuit is high.Therefore, the resonance conditions of the resonant circuit of the capacitive element and the inverter circuit are different, Although the output of the inverter circuit is not stable, the oscillation switching means is frequency-modulated and ON-width controlled, and in the portion where the output voltage of the full-wave rectifier circuit is low, the output voltage of the inverter circuit is continuously reduced.
Alter the frequency and on-width, the output voltage is higher portions of the full-wave rectifier circuit output voltage of the inverter circuit
Continuous continuously frequency and ON widths in the direction to decrease the pressure
Manner to alter, regardless of the output voltage from the full-wave rectifier circuit, Nakusuko ripple current with the input can be given the output of the inverter circuit even pseudo sine wave
You can

In the discharge lamp lighting device according to the fourth aspect, since the discharge lamp is connected to the inverter circuit of the power supply device according to any one of the first to third aspects, the lamp output of the discharge lamp can be made constant and the ripple current can be eliminated. Can
It

In the lighting device according to the fifth aspect, since the discharge lamp according to the fourth aspect is provided in the main body of the fixture, the lamp output of the discharge lamp can be made constant and the ripple current can be eliminated.
You can

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the illumination device of the present invention will be described below with reference to the drawings. The circuit configuration itself is the same as in FIG. 1 illustrating the prior art.

In FIG. 2, reference numeral 11 designates a main body of the equipment, and lamp sockets 12, 12 are mounted facing each other in the vicinity of both ends of the main body 11 of the equipment, and a discharge lamp FL is sandwiched between the lamp sockets 12, 12. , In addition, inside the instrument body 11,
The circuit shown in FIG. 1 is incorporated.

As shown in FIG. 1, the input terminal of the full-wave rectifier circuit 1 is connected to the commercial AC power source E, and the full-wave rectifier circuit 1 is connected.
A smoothing capacitor C1 is connected to the output terminal of. A diode D1 as a power factor improving switching means is connected to the positive electrode of the full-wave rectifier circuit 1.

Further, a capacitor via the diode D1
A series circuit of a capacitor C2 as a capacitive element, a capacitor C3, and an inrush current preventing inductor L1 is connected in parallel to C1.

Further, an inverter circuit 2 for regenerating reactive power is connected between both terminals of the capacitor C2. This inverter circuit 2 has the input winding Tr of the inverter transformer Tr between both terminals of the full-wave rectification circuit 1 via the diode D1.
1 and a series circuit of an oscillation switch Q1 as an oscillation switching means are connected, a diode D2 and a resonance capacitor C4 are connected in parallel between both terminals of the oscillation switch Q1, and the oscillation switch Q1 is It is controlled by the control circuit 3.

Further, the output winding of the inverter transformer Tr
One end of each of the filaments FLa and FLb of the discharge lamp FL is connected to Tr2, and a starting capacitor C5 is connected to the other end of each of the filaments FLa and FLb.

Next, the operation of the above embodiment will be described.

The control circuit 3 oscillates at a frequency of, for example, about 45 kHz to 50 kHz by frequency modulation,
When the frequency is low, the output voltage is high, and when the frequency is high, the output voltage is low. When the oscillation switch Q1 is on, the input winding of the inverter transformer Tr
When Tr1 is charged and the oscillation switch Q1 is off, the capacitor C4 is charged / discharged and the diode
Current flows through D2.

Then, the voltage of the commercial AC power source E is full-wave rectified by the full-wave rectifier circuit 1 to charge the capacitor C1. When the potential on the cathode side is lower than the potential on the anode side of the diode D1, that is, when the voltage of the capacitor C2 is lower than the voltage rectified by the full-wave rectification circuit 1, the voltage of the full-wave rectification circuit 1 is the diode D1. Through the inverter transformer
Input winding of Tr Tr1, input winding of resonance circuit of capacitor C4
Current flows from Tr1 to capacitor C4. Also, when this current is inverted and the current in the input winding Tr1 and the capacitor C4 is discharged, current flows in the resonance circuit of the capacitor C4, the input winding Tr1 and the capacitor C2 due to regenerative power,
Charge the capacitors C2 and C3.

On the other hand, when the potential on the cathode side is higher than the potential on the anode side of the diode D1, that is, when the voltage of the capacitor C2 is higher than the voltage rectified by the full wave rectifying circuit 1, the full wave rectifying circuit 1 The voltage charges capacitor C1. Then, the charging currents of the capacitors C2 and C3 are supplied to the resonance circuit with the input winding Tr1 of the inverter transformer Tr, the capacitor C4, etc., and the current flows from the input winding Tr1 to the capacitor C4. The capacity of the capacitor C2 is about the ON time of the oscillation switch Q1 and is instantly discharged. Also, when this current is inverted and the current in the input winding Tr1 and capacitor C4 is discharged,
Regenerative power causes a current to flow in the resonance circuit of capacitor C4, input winding Tr1 and capacitor C2, which causes resonance operation to charge capacitors C2 and C3, and the voltage is boosted and supplied to input winding Tr1. As described above, when the diode D1 is in the off state, the diode D1 enters the resonance state and the voltage of the output winding Tr2 rises.

When controlling the oscillation switch Q1 by the control circuit 3, when the output voltage of the full-wave rectifier circuit 1 is high, that is, when the absolute value of the output voltage shown in FIG. 3A is high. Lowers the frequency at which the switch Q1 for oscillation from the control circuit 3 shown in FIG. 3B oscillates to increase the output voltage of the inverter circuit 2, and conversely, the output voltage of the full-wave rectifier circuit 1 decreases. In this case, that is, when the absolute value of the output voltage shown in FIG. 3A is low, the frequency at which the oscillation switch Q1 from the control circuit 3 oscillates is increased and the output voltage of the inverter circuit 2 is decreased. In this way, by changing the frequency and performing frequency modulation, the output of the full-wave rectifier circuit 1 changes, and for example, when the output from the full-wave rectifier circuit 1 is low near 0 cross, the off period of the diode D1 is reduced. Becomes longer, the boost amount due to resonance by the resonance circuit increases and the output winding
Even if the voltage induced in Tr2 rises and the output voltage of the inverter circuit 2 rises, the frequency of the oscillation switch Q1 rises due to the frequency control from the control circuit 3, and the output winding Tr2 The output voltage tends to decrease. On the contrary, when the output from the full-wave rectifier circuit 1 is high, the ON period of the diode D1 becomes longer, the boost amount due to the resonance of the resonance circuit decreases, the voltage induced in the output winding Tr2 decreases, and the inverter circuit Even if the output voltage of 2 decreases, the frequency of the oscillation switch Q1 decreases due to the frequency control from the control circuit 3, and the output voltage of the output winding Tr2 increases. Therefore, even if the pseudo sine wave is used as the input voltage, the ripple current is prevented from occurring as in the conventional case.

In the portion where the output voltage of the full-wave rectification circuit 1 is the highest, the frequency is lowered to output the inverter circuit 2. On the contrary, the portion where the output voltage of the full-wave rectification circuit 1 is the lowest is the highest frequency. Is output to output the inverter circuit 2 and the output voltage of the inverter circuit 2 is made constant.

The output winding of the inverter transformer Tr
The discharge lamp FL is lit at high frequency by inducing high-frequency alternating current in Tr2.

As described above, the control circuit 3 frequency-modulates the oscillating switch Q1 in accordance with the output voltage of the full-wave rectifier circuit 1 so that the frequency of frequency modulation is continuously changed. Even if it is a wave, the ripple current can be surely eliminated.

Next, an embodiment in which the ripple current is eliminated by another control will be described.

In this embodiment, when the control circuit 3 controls the oscillating switch Q1, when the output voltage of the full-wave rectifier circuit 1 shown in FIG. 4 (a) is high, FIG. The ON width of the oscillation switch Q1 from the control circuit 3 shown in
The output voltage of the inverter circuit 2 is increased and, conversely, as shown in FIG.
When the output voltage of the full-wave rectifier circuit 1 shown in (a) is low, an oscillation switch from the control circuit 3 shown in FIG.
The ON width of Q1 is lengthened and the output voltage of the inverter circuit 2 is lowered. In this way, by changing the ON width to control the ON width, the output of the full-wave rectifier circuit 1 changes, and, for example, when the output from the full-wave rectifier circuit 1 is low near 0 cross, the diode D1 Even if the OFF period becomes longer, the boosted amount due to resonance by the resonance circuit increases, the voltage induced in the output winding Tr2 rises, and the output voltage of the inverter circuit 2 also rises, the control circuit 3 The ON width of the oscillation switch Q1 is shortened by the ON width control, and the output voltage of the output winding Tr2 decreases. On the contrary, when the output from the full-wave rectifier circuit 1 is high, the ON period of the diode D1 becomes longer, the boost amount due to the resonance of the resonance circuit decreases, the voltage induced in the output winding Tr2 decreases, and the inverter circuit Even when the output voltage of 2 decreases, the ON width of the oscillation switch Q1 increases due to the ON width control from the control circuit 3, and the output voltage of the output winding Tr2 increases. Therefore, even if the pseudo sine wave is used as the input voltage, the ripple current is prevented from occurring as in the conventional case.

In the portion where the output voltage of the full-wave rectifier circuit 1 is the highest, the ON width is maximized to output the inverter circuit 2. On the contrary, the portion where the output voltage of the full-wave rectifier circuit 1 is the lowest is the highest. The ON width is shortened to output the inverter circuit 2, and the output voltage of the inverter circuit 2 is made constant.

As described above, the control circuit 3 controls the on-width to continuously change the on-width of the oscillation switch Q1 in accordance with the output voltage of the full-wave rectifier circuit 1, so that the input is a pseudo sine wave. Even in this case, the ripple current can be surely eliminated.

Further, an embodiment in which the ripple current is eliminated by another control will be described.

In this embodiment, when the control circuit 3 controls the oscillating switch Q1, when the output voltage of the full-wave rectifier circuit 1 shown in FIG. 5A is high, FIG. 5 (c), the ON width of the oscillation switch Q1 shown in FIG. 5 (c) is lengthened to increase the output voltage of the inverter circuit 2, and, conversely, as shown in FIG. 5 (a). When the output voltage of the full-wave rectifier circuit 1 shown in FIG.
The frequency from the control circuit 3 shown in FIG.
The ON width of the oscillation switch Q1 shown in (c) is lengthened to lower the output voltage of the inverter circuit 2. In this way, by changing the frequency to perform frequency modulation and changing the ON width to perform ON width control, the output of the full-wave rectifier circuit 1 changes, and, for example, the output from the full-wave rectifier circuit 1 changes. When the voltage is low near 0 cross, the OFF period of the diode D1 becomes longer, the boost amount due to resonance by the resonance circuit increases, the voltage induced in the output winding Tr2 rises, and the output voltage of the inverter circuit 2 rises. Even if it becomes, the oscillation switch Q1 is controlled by the frequency modulation from the control circuit 3.
As the frequency increases, the ON width of the oscillation switch Q1 becomes shorter due to the ON width control, and the output voltage of the output winding Tr2 decreases. On the contrary, when the output from the full-wave rectifier circuit 1 is high, the ON period of the diode D1 becomes longer, and the boosted amount due to the resonance of the resonance circuit decreases and the output winding
Even if the voltage induced in Tr2 decreases and the output voltage of the inverter circuit 2 decreases, the frequency of the oscillation switch Q1 decreases and the oscillation switch Q1 decreases due to the control by the frequency modulation from the control circuit 3. The ON width of the oscillation switch Q1 is increased by controlling the ON width of the output winding Tr2.
The output voltage of will increase. Therefore, even if the pseudo sine wave is used as the input voltage, the ripple current is prevented from occurring as in the conventional case.

In the portion where the output voltage of the full-wave rectifier circuit 1 is the highest, the frequency is set to be the lowest and the ON width is extended to output the inverter circuit 2. On the contrary, the output voltage of the full-wave rectifier circuit 1 is changed. In the lowest part, the frequency is made highest and the ON width is made short to output the inverter circuit 2 to make the output voltage of the inverter circuit 2 constant.

As described above, the control circuit 3 controls the frequency modulation and the ON width so that the oscillating switch Q1 continuously changes the frequency of the frequency modulation in accordance with the output voltage of the full-wave rectifier circuit 1 and the ON width. Is controlled continuously, the ripple current can be surely eliminated even if the input is a pseudo sine wave.

[0048]

According to the power supply device according to claim 1, wherein, according to the present invention, the oscillating switching means is a frequency modulation control, the output voltage of the inverter circuit in the output voltage is lower portions of the full-wave rectifier circuit
Is varied continuously frequency in a direction to lower the output electric inverter circuit in the output voltage is higher portions of the full-wave rectifier circuit
To change the frequency continuously in the direction of increasing the pressure ,
Input is pseudo regardless of the output voltage from the full-wave rectifier circuit
The output of the inverter circuit can be made constant even with a sine wave
At the same time, the ripple current can be eliminated .

According to another aspect of the power supply device of the present invention, the oscillation switching means is ON-width controlled, and the output voltage of the inverter circuit is continuously reduced in a portion where the output voltage of the full-wave rectifier circuit is low. to an oN width is varied, the high output voltage of the inverter circuit in the output voltage is higher portions of the full-wave rectifier circuit
For continuously varying the ON width in the direction of Ku, regardless of the output voltage from the full-wave rectifier circuit, the input pseudo sine wave
Together to be able to constant the output of the inverter circuit even
Ripple current can be eliminated .

According to the third aspect of the power supply device, the oscillation switching means is frequency-modulated and ON-width controlled.
In the portion where the output voltage of the full-wave rectifier circuit is low, the frequency and ON width are continuously changed in the direction of decreasing the output voltage of the inverter circuit, and in the portion where the output voltage of the full-wave rectifier circuit is high, To continuously change the frequency and ON width in the direction of increasing the output voltage ,
Input is pseudo regardless of the output voltage from the full-wave rectifier circuit
The output of the inverter circuit can be made constant even with a sine wave
At the same time, the ripple current can be eliminated .

According to the discharge lamp lighting device of the fourth aspect,
Since the discharge lamp is connected to the inverter circuit of the power supply device according to any one of claims 1 to 3, the lamp output of the discharge lamp can be made constant and ripple current can be eliminated.
You can

According to the lighting device of the fifth aspect, since the discharge lamp of the fourth aspect is provided in the fixture body, the lamp output of the discharge lamp can be made constant and the ripple current can be reduced.
It can be lost .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp lighting device of the present invention.

FIG. 2 is a perspective view showing the same illumination device.

FIG. 3 is a waveform diagram showing the operation of the above discharge lamp lighting device. (A) Waveform diagram showing the voltage of the commercial AC power supply (b) Waveform diagram showing the oscillation frequency of the control circuit

FIG. 4 is a waveform diagram showing an operation of a discharge lamp lighting device of another embodiment of the same as above. (A) Waveform diagram showing the voltage of the full-wave rectifier circuit (b) Waveform diagram showing the ON width of the control circuit

FIG. 5 is a waveform diagram showing an operation of a discharge lamp lighting device according to another embodiment of the present invention. (A) Waveform diagram showing the voltage of the full-wave rectifier circuit (b) Waveform diagram showing the oscillation frequency of the control circuit (c) Waveform diagram showing the ON width of the control circuit

FIG. 6 is a waveform diagram showing an operation of a conventional discharge lamp lighting device. (A) Waveform diagram showing the voltage of the commercial AC power supply (b) Waveform diagram showing the lamp current

FIG. 7 is a waveform diagram showing an operation of another conventional discharge lamp lighting device. (A) Waveform diagram showing the voltage of the rectangular wave AC power supply (b) Waveform diagram showing the lamp current

[Explanation of symbols]

1 Full-wave rectifier circuit 2 Inverter circuit C2 Capacitor as capacitive element C3 Capacitor D1 Diode E as switching means for power factor improvement Commercial AC power supply L1 Inductor Q1 Oscillation switch as switching means for oscillation

Continuation of the front page (56) Reference JP-A-5-21774 (JP, A) JP-A-4-345792 (JP, A) JP-A-5-38153 (JP, A) JP-A-1-160367 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05B 41/24 H02M 3/28

Claims (5)

(57) [Claims] 1. A full-wave rectifier circuit for full-wave rectifying the voltage of an AC power supply, a power factor improving switching means for turning on and off the output of the full wave rectifying circuit, and the full-factor rectifying circuit for switching the power factor improving switching means. and a capacitive element connected to the wave rectifying circuit, capacitor connected in parallel for this capacitive element
Series circuit of the capacitor and inductor, and the capacitive element and
Are connected to a series circuit of the fine said capacitor and an inductor switched at high frequency to the power factor correction switching means based on the output of the regeneration and the full-wave rectifier circuit of the reactive power to form a resonant circuit and the capacitive element and a capacitor An inverter circuit having a switching means for oscillation, wherein when the switching means for power factor improvement is on, the full-wave rectification circuit causes the resonance circuit to operate.
Ri and resonance current flows to power the front Symbol inverter circuit together when charging the capacitive element and the capacitor,
When the power factor improving switching means is off, the capacitor connected via the capacitive element and the inductor causes
In the oscillating circuit with a resonance current flows the power supply for supplying power to the inverter circuit, the oscillation switching means is a frequency modulation control, the output voltage is lower portions of the full-wave rectifier circuit the output voltage of the inverter circuit changing continuously the frequency in a direction to lower the output voltage is higher portions of the full-wave rectifier circuit and wherein the continuously varying the <br/> frequency in a direction to increase the output voltage of the inverter circuit Power supply. 2. A full-wave rectifier circuit for full-wave rectifying the voltage of an AC power supply, a power factor improving switching means for turning on and off the output of the full wave rectifying circuit, and the full-factor rectifying circuit for switching the power factor improving switching means. and a capacitive element connected to the wave rectifying circuit, capacitor connected in parallel for this capacitive element
Series circuit of the capacitor and inductor, and the capacitive element and
Are connected to a series circuit of the fine said capacitor and an inductor switched at high frequency to the power factor correction switching means based on the output of the regeneration and the full-wave rectifier circuit of the reactive power to form a resonant circuit and the capacitive element and a capacitor An inverter circuit having a switching means for oscillation, wherein when the switching means for power factor improvement is on, the full-wave rectification circuit causes the resonance circuit to operate.
Ri and resonance current flows to power the front Symbol inverter circuit together when charging the capacitive element and the capacitor,
When the power factor improving switching means is off, the capacitor connected via the capacitive element and the inductor causes
In the oscillating circuit with a resonance current flows the power supply for supplying power to the inverter circuit, the oscillation switching means is ON width control, the output voltage is lower portions of the full-wave rectifier circuit the output voltage of the inverter circuit in a direction to lower varying continuously oN width, the output voltage is higher portions of the full-wave rectifier circuit is characterized by continuously varying the oN width in a direction to increase the output voltage of the inverter circuit power supply apparatus. 3. A full-wave rectifier circuit for full-wave rectifying the voltage of an AC power supply, a power factor improving switching means for turning on and off the output of the full wave rectifying circuit, and the full-factor rectifying circuit for switching the power factor improving switching means. and a capacitive element connected to the wave rectifying circuit, capacitor connected in parallel for this capacitive element
Series circuit of the capacitor and inductor, and the capacitive element and
Are connected to a series circuit of the fine said capacitor and an inductor switched at high frequency to the power factor correction switching means based on the output of the regeneration and the full-wave rectifier circuit of the reactive power to form a resonant circuit and the capacitive element and a capacitor An inverter circuit having a switching means for oscillation, wherein when the switching means for power factor improvement is on, the full-wave rectification circuit causes the resonance circuit to operate.
Ri and resonance current flows to power the front Symbol inverter circuit together when charging the capacitive element and the capacitor,
When the power factor improving switching means is off, the capacitor connected via the capacitive element and the inductor causes
In a power supply device in which a resonance current flows by a vibration circuit to supply power to the inverter circuit, the oscillation switching means is frequency-modulated and ON-width controlled, and the output voltage of the full-wave rectifier circuit is low in the inverter circuit. continuously changing the frequency and oN width in a direction to lower the output voltage, the output voltage is higher portions of the full-wave rectifier circuit output voltage of the inverter circuit
A power supply device characterized in that the frequency and the on-width are continuously changed in the direction of increasing the voltage. 4. A discharge lamp lighting device, wherein a discharge lamp is connected to the inverter circuit of the power supply device according to claim 1. 5. An illuminating device comprising the discharge lamp according to claim 4 provided in a fixture body.