JP3733987B2 - Power supply device, discharge lamp lighting device, and lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply device, a discharge lamp lighting device, and a lighting device with reduced harmonics.
[0002]
[Prior art]
Conventionally, as a discharge lamp lighting device with reduced harmonics of this type, a full-wave rectifier circuit such as a diode bridge is connected to a commercial AC power supply, and a smoothing capacitor is connected to the output side of this full-wave rectifier circuit. A boost chopper circuit as a pre-regulator circuit is connected to the smoothing capacitor, a one-stone self-excited inverter circuit is connected to the boost chopper circuit, and a discharge lamp is connected to the output side of the inverter circuit. .
[0003]
Then, the AC voltage of the commercial AC power supply is full-wave rectified by a full-wave rectifier circuit, the voltage rectified by the full-wave rectifier circuit is smoothed by a capacitor, and the voltage smoothed by the capacitor is boosted by a boost chopper circuit. In addition, the input current waveform is adjusted and converted into a high frequency by an inverter circuit, and the discharge lamp is lit at a high frequency.
[0004]
[Problems to be solved by the invention]
However, in the case of the above conventional configuration, since the boost chopper circuit is connected to the input side of the inverter circuit, it is necessary to control not only the inverter circuit but also the boost chopper circuit. There is a problem that the control of the system becomes complicated.
[0005]
Therefore, a configuration in which an inductor and a series circuit of a large-capacitance capacitor having a larger capacity than that of the small-capacitance capacitor are connected to a small-capacitance capacitor and, for example, a monolithic inverter circuit is connected to the output side of the series circuit is not known. Can be considered.
[0006]
However, although it is possible to reduce the input distortion by simplifying the configuration, it is desired to further reduce the distortion.
[0007]
The present invention has been made in view of the above problems, and an object thereof is to provide a power supply device, a discharge lamp lighting device, and a lighting device that can reduce input current distortion with a simple configuration.
[0008]
[Means for Solving the Problems]
The power supply device according to claim 1 is a full-wave rectifying means for full-wave rectifying an alternating voltage of a commercial AC power supply; a small-capacitance capacitor connected in parallel to the full- wave rectifying means; a discharge diode, an inductor, and a small capacity A series circuit that is composed of a large-capacitance capacitor with a larger capacity than that of the capacitor, connected in parallel via a diode to a small-capacitance capacitor, a capacitor connected in parallel to the diode, a diode, and a discharge diode And a charging diode connected in parallel to the inductor and connected in reverse polarity to the discharging diode, and the inverter means connected in parallel to the series circuit has a high frequency to the voltage of the small-capacitance capacitor. And by charging a large-capacity capacitor via a charging diode, It clamps the voltage of the sub below the voltage of the large-capacity capacitor is obtained by including an input current distortion reduction means for reducing an input current distortion. In addition, high frequency is superimposed on a large-capacitance capacitor to reduce distortion, and when charging a large-capacity capacitor, no inductor is used, so the voltage of the small-capacitance capacitor is clamped below the voltage of the large-capacitance capacitor. to Runode reduce input current distortion, a large current peak does not flow, the input current is low-distortion.
[0009]
請 discharge lamp lighting device Motomeko 2 described, claim 1 and a power supply device according; are connected in parallel with the series circuit of the power supply apparatus, according to claim 1 for lighting a discharge lamp by supplying power to the discharge lamp The inverter means described above is provided, and each effect is achieved and the crest factor is improved.
[0010]
Lighting apparatus according to the third aspect, a discharge lamp lighting device according to claim 2 wherein; be understood that the discharge lamp lighting device is provided with a fixture main body provided exhibits the respective action.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a lighting device of the present invention will be described with reference to the drawings.
[0012]
FIG. 2 is an exploded perspective view showing the illuminating device. As shown in FIG. 2, a thin disk-shaped instrument body 1 is attached to a hooking ceiling (not shown) by an adapter 2, and a discharge lamp is mounted on the lower surface of the instrument body 1. A holder body 3 to which fluorescent lamps FL1 and FL2 are attached is attached, and these fluorescent lamps FL1 and FL2 are covered with a holder 4 and a shade 4 having translucency. The appliance main body 1 accommodates a discharge lamp lighting device 5.
[0013]
FIG. 1 is a circuit diagram showing a discharge lamp lighting device. As shown in FIG. 1, this discharge lamp lighting device 5 is connected to a commercial AC power source e as a full-wave rectifying means via an inductor L1 and a capacitor C1. An input terminal of a full-wave rectifier circuit 11 such as a diode bridge is connected, and an input current distortion reduction circuit 12 as input current distortion reduction means is connected to the output terminal of the full-wave rectifier circuit 11.
[0014]
This input current distortion reduction circuit 12 is connected to a small-capacitance capacitor C2 via a diode D1 and a series circuit of a large-capacitance capacitor C3 that is larger in capacity than the discharge diode D2, the inductor L2, and the small-capacitance capacitor C2. In addition, a capacitor C4 is connected in parallel to the diode D1, and a charging diode D3 is connected in parallel to the diode D1, the discharging diode D2 and the inductor L2 with a polarity opposite to that of the discharging diode D2.
[0015]
Further, an inverter circuit 15 as an inverter means is connected to the input current distortion reduction circuit 12. The inverter circuit 15 is connected to a resonance inductor L3 and a series circuit of a collector and an emitter of a transistor Q1 as a switching means. The collector and emitter of the transistor Q1 are connected to a resonance capacitor C5 and a recirculation diode D4. A parallel circuit is connected. A control circuit (not shown) is connected to the base of the transistor Q1. Further, a series resonance circuit 16 is formed by the resonance inductor L3 and the resonance capacitor C5.
[0016]
A load 17 is connected to the inductor L3 via a ballast L4, and the load 17 includes fluorescent lamps FL1, FL2, and the like.
[0017]
Next, the operation of the above embodiment will be described.
[0018]
First, the voltage of the commercial AC power source e is full-wave rectified by the full-wave rectifier circuit 11, and the capacitor C3 is charged via the capacitor C2 and the diode D3 .
[0019]
In the state where the transistor Q1 is on, the inductor L3 is charged via the diode D1, and when the transistor Q1 is turned off, the inductor L3 and the capacitor C5 resonate, and a high frequency voltage is supplied to the load 17. A high frequency is supplied to the capacitor C2 via the capacitor C4. As a result, as shown in FIG. 4, a high frequency ripple is superimposed so that the full-wave rectifier circuit 11 can conduct at any phase of the input voltage. The voltage is almost constant, distortion to the load 17 is reduced, harmonics can be reduced, and the crest factor is improved.
[0020]
Further, when charging the capacitor C3, it is charged from the full-wave rectifier circuit 11 or via the path of the diode D4, the inductor L3, the capacitor C4, the charging diode D3, and the capacitor C3 without going through the inductor L2. Since the voltage of the capacitor C2 can be clamped below the voltage of the capacitor C3 as shown in FIG. 2 and a large peak current does not flow through the capacitor C2, the distortion is further reduced. Note that the potential of the capacitor C3 is normally higher than the voltage output from the full-wave rectifier circuit 11.
[0021]
On the other hand, when the capacitor C3 is discharged, it is discharged through the inductor L2 and the discharging diode D2, so the degree of direct current pulsation is reduced and the voltage does not drop to near zero potential.
[0022]
In addition, when the capacitor C3 is charged through the inductor L2, the voltage of the capacitor C2 changes greatly as shown in FIG. 5 and distortion increases, causing harmonics. When charging the capacitor C3, As shown in FIG. 3, the voltage of the capacitor C2 is clamped by the capacitor C3 and the distortion is reduced, and the full-wave rectification is performed by passing the inductor L2 only when the capacitor C3 is discharged. The withstand voltage of the circuit 11 can also be reduced.
[0023]
【The invention's effect】
According to the power supply device of the first aspect, the high frequency is superimposed on the large-capacity capacitor to reduce distortion, and when charging the large-capacity capacitor, the inductor is not interposed, so the voltage of the small-capacitance capacitor is reduced. Runode reduce input current distortion clamped to the voltage following a large-capacitance capacitor, it does not flow a large current peak, it low distortion of the input current.
[0024]
According to the discharge lamp lighting apparatus 請 Motomeko 2, are connected in parallel with the series circuit of the power supply device, since equipped Louis converter means to light the discharge lamp to supply power to the discharge lamp, respectively The crest factor can be improved.
[0025]
According to the illuminating device of the third aspect, since the appliance main body provided with the discharge lamp lighting device according to the second aspect is provided, the respective effects can be achieved.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp lighting device according to the present invention.
FIG. 2 is an exploded perspective view showing the illumination device.
FIG. 3 is a waveform diagram showing a voltage of the capacitor C2.
FIG. 4 is a waveform diagram showing an input voltage of the inverter circuit.
FIG. 5 is a waveform diagram showing a voltage of the capacitor C2 of the comparative example.
[Explanation of symbols]
1 Appliance body 5 Discharge lamp lighting device
11 Full-wave rectifier circuit as a full-wave rectifier
12 Input current distortion reduction circuit as input current distortion reduction means
15 Inverter circuit as inverter means
C2, C3 capacitors
C4 capacitor
D1 diode
D2 Discharge diode
D3 Charging diode e Commercial AC power supply
FL1, FL2 Fluorescent lamps as discharge lamps
L2 inductor

Claims (3)

Full wave rectification means for full wave rectification of the AC voltage of the commercial AC power supply;
It consists of a small capacitor connected in parallel to the full-wave rectifier and a large capacitor with a larger capacity than the discharge diode, inductor and small capacitor, and in parallel with the small capacitor via the diode. A connected series circuit, a capacitor connected in parallel to the diode, a charging diode connected in parallel to the diode, the discharging diode and the inductor, and connected in reverse polarity to the discharging diode. And the inverter means connected in parallel to the series circuit superimposes the high frequency on the voltage of the small capacity capacitor and charges the large capacity capacitor via the charging diode, thereby clamping the below the voltage of the large-capacity capacitor reduced to the input current distortion And power current distortion reducing means;
Power supply, characterized in that provided with the. A power supply device according to claim 1;
Inverter means according to claim 1 , wherein the inverter means is connected in parallel to the series circuit of the power supply device, and supplies power to the discharge lamp to light the discharge lamp ;
The discharge lamp lighting apparatus characterized by comprising a. A discharge lamp lighting device according to claim 2 ;
An instrument body provided with the discharge lamp lighting device;
An illumination device comprising:

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