JPH0654518A - Power supply rectifier circuit, discharge lamp lighting device and luminaire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a discharge lamp lighting device with reduced inrush current. [Composition] A full-wave rectification circuit 11, a power supply rectification circuit 12, and a discharge lamp lighting circuit 16 are connected to a commercial AC power supply E, and a discharge lamp FL is connected to the discharge lamp lighting circuit 16. Power rectifier circuit 12
Form a charging circuit 13 for the first capacitor C1, the first diode D1 and the second capacitor C2 having a capacity that is at least twice the capacity of the first capacitor C1. First capacitor C1
A first discharge circuit 14 is formed by the first diode D1, and a second discharge circuit 15 is formed by the third diode D3 and the second capacitor C2. At the time of discharging, the first capacitor C1 and the second capacitor C2 are connected in parallel, and at the time of charging, the first capacitor C1 and the second capacitor C2 are connected in series. The combined capacity during charging can be reduced, and the inrush current can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply rectifier circuit for rectifying an output from a power supply circuit, a discharge lamp lighting device and a lighting fixture having the power supply rectifier circuit.

[0002]

2. Description of the Related Art As a conventional device having this kind of power supply rectifying circuit, for example, a structure disclosed in Japanese Patent Publication No. 63-37584 is known.

The structure disclosed in Japanese Patent Publication No. 63-37584 is a first structure in which the output terminals of a power supply circuit have substantially the same capacitance.
And a second capacitor, and a first diode connected in the forward direction between the first and second capacitors in the charging direction of the first and second capacitors, Further, the second diode is connected in series to the load in the forward direction of the discharge direction of the first capacitor to form a first discharge circuit, and the second diode is connected to the load in the forward direction of the discharge direction. 3 in series
The second discharge circuit is configured by connecting the diode of FIG.

When the output voltage from the power supply circuit is higher than the voltage of the series circuit of the first and second capacitors and the first diode, the charging circuit outputs the output from the power supply circuit through the first diode. To charge the first and second capacitors, and conversely, when the output voltage from the power supply circuit is lower than the voltage of the series circuit of the first and second capacitors and the first diode, the first discharge circuit Discharges the electric charge of the first capacitor to the load via the second diode, and causes the second discharge circuit to discharge the second charge.
Discharges the electric charge of the capacitor to the load through the third diode.

[0005]

However, in the case of the structure described in Japanese Patent Publication No. 63-37584, the first and second capacitors are charged at the moment when the power supply circuit is powered on. There is a problem that a rush current may flow in, the power switch of the power supply circuit may be welded, or the power supply voltage may be lowered and the other devices in use may be affected by the voltage effect.

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 rectifying circuit, a discharge lamp lighting device, and a lighting fixture in which an inrush current is reduced.

[0007]

According to a first aspect of the present invention, there is provided a power supply rectifier circuit comprising: a first and a second capacitor connected between output terminals of the power supply circuit; and a first and a second capacitor connected between the first and second capacitors. And a charging circuit including a first rectifying element that is connected in the forward direction in the charging direction of the second capacitor, and a load connected in the forward direction in the discharging direction of the first capacitor and the first capacitor. A first discharge circuit composed of a second rectifying element connected in series, a first discharge circuit connected in the forward direction in the discharge direction of the second capacitor and the second capacitor, and connected in series with the load. In a power supply rectifier circuit comprising a rectifier element No. 3 and a second discharge circuit connected in parallel to the first discharge circuit, the capacitance ratio of the first and second capacitors is set to 2
It is more than doubled.

According to a second aspect of the present invention, there is provided a power source rectifying circuit in which a plurality of capacitors are connected in series between output terminals of the power source circuit. A surge voltage detection circuit is connected to detect the surge voltage based on the voltage across the capacitor.

According to another aspect of the power rectifier circuit of the present invention, in the power rectifier circuit in which a plurality of capacitors are connected in series between output terminals of the power circuit, the capacities of the plurality of capacitors are made different, and the large capacity The voltage fluctuation circuit for detecting the voltage fluctuation of the power supply circuit is connected by the voltage across the capacitor.

According to a fourth aspect of the discharge lamp lighting device of the present invention, the load is the discharge lamp lighting circuit for lighting the discharge lamp.

According to a fifth aspect of the present invention, the discharge lamp lighting device according to the fourth aspect is built in the main body of the illumination device.

[0012]

In the power supply rectifier circuit according to the first aspect of the present invention, the first discharge circuit and the second discharge circuit are connected in parallel when the first and second capacitors are discharged. The combined capacitance of the second capacitor is the sum of the capacitance of the first capacitor and the capacitance of the second capacitor. When charging the first and second capacitors, the first capacitor and the second capacitor of the charging circuit are Are connected in series, the combined capacitance of the first capacitor and the second capacitor is the product of the capacitances of the first capacitor and the second capacitor divided by the sum. If the capacitance ratio of the first and second capacitors is doubled or more while the combined capacitance of the first capacitor and the second capacitor is kept constant, the combined capacitance in the case of series connection will be small. Ri, it is possible to reduce the inrush current.

In the power supply rectifier circuit according to the present invention, the surge voltage detecting circuit for detecting the surge voltage is connected to one of the plurality of capacitors having the smaller capacity, so that a sharp change in the voltage can be detected easily. The surge voltage can be detected reliably.

In the power supply rectifier circuit according to the present invention, the capacitance on the ground side of the plurality of capacitors is increased, and the voltage fluctuation circuit for detecting the voltage fluctuation of the power supply circuit is connected to the large capacity side. It is possible to detect the voltage fluctuation of the power supply circuit without being affected by the ripple component of the above.

The discharge lamp lighting device according to claim 4 is a discharge lamp lighting circuit for causing a load to light the discharge lamp.
Since the power supply rectifier circuit according to any one of 1 to 3 is included, inrush current can be reduced.

In the lighting equipment according to the fifth aspect, the discharge lamp lighting device according to the fourth aspect is built in the main body of the lighting equipment, so that the inrush current can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lighting apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a main body of the luminaire, and lamp sockets 2 and 2 are provided at opposite ends of the main body 1 of the luminaire so as to face each other.
A straight tube type fluorescent lamp FL as a discharge lamp is attached between the two.

As shown in FIG. 1, a full-wave rectifier circuit 11 is connected to a commercial AC power source E, and the full-wave rectifier circuit 11 has a power source rectifier circuit 12 in the electric circuit built in the main body 1 of the luminaire. Are connected. This power supply rectifier circuit 12 has a first
Capacitor C1, the first diode D1 as the first rectifying element in the forward direction with respect to the output voltage of the full-wave rectifier circuit 11, and the second capacitor C2 having a capacity that is at least twice the capacity of the first capacitor C1. A charging circuit 13 including a series circuit of is connected between the output terminals of the full-wave rectification circuit 11.

Further, a second diode D2 as a second rectifying element in the reverse element direction with respect to the output voltage of the full-wave rectifying circuit 11 is provided in parallel with the first diode D1 and the second capacitor C2. Connected to the first capacitor C1 and the first
The first discharge circuit 14 is formed by the diode D1.

Further, in parallel with the first capacitor C1 and the first diode D1, a third diode D3 as a third rectifying element in the reverse element direction with respect to the output voltage of the full-wave rectifying circuit 11 is provided. The third diode D3 and the second capacitor C2 which are connected to each other form a second discharge circuit 15.

A discharge lamp lighting circuit 16 of an inverter circuit, which is a load, is connected to the output terminal of the power supply rectifier circuit 12. In this discharge lamp lighting circuit 16, the primary winding Tra of the inverter transformer Tr and the collector and emitter of the transistor Q1 are connected in series to the power supply rectifier circuit 12, and the capacitor C3 is connected in parallel to the primary winding Tra. A feedback diode D4 is connected between the collector and emitter of the transistor Q1. A control circuit 17 is connected to the base of the transistor Q1 as a voltage fluctuation detection circuit that detects the power supply voltage that is connected to the second capacitor C2 and that detects the voltage across the second capacitor C2, and controls the output. ing.

The secondary winding of the inverter transformer Tr
The filaments FLa and FLb of the fluorescent lamp FL are connected to the Trb, and the starting capacitor C4 is connected between the filaments FLa and FLb.

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

First, the AC of the commercial AC power source E is full-wave rectified by the full-wave rectifier circuit 11, and smoothed and rectified by the power source rectifier circuit 12.
The discharge lamp lighting circuit 16 converts the light into a high frequency and lights the fluorescent lamp FL.

Here, in the power supply rectifier circuit 12, the pulsating voltage output from the full-wave rectifier circuit 11 is the voltage of the first capacitor C1, the first diode D1 and the second capacitor C2 of the charging circuit 13. If higher, the first diode D1 charges the first capacitor C1 and the second capacitor C2. When the voltage of the pulsating current output from the full-wave rectifier circuit 11 is lower than the voltages of the first capacitor C1, the first diode D1 and the second capacitor C2 of the charging circuit 13, the second diode 1st capacitor through D2
As C1 is discharged, the second capacitor C2 is discharged through the third diode D3, and the smoothed voltage is supplied to the discharge lamp lighting circuit 16.

The control circuit 17 also includes a first capacitor C1.
By detecting the voltage of the second capacitor C2, which has a larger capacity than that of, the voltage fluctuation from the full-wave rectification circuit 11 is detected, the oscillation of the transistor Q1 is controlled, and the discharge lamp lighting circuit is controlled.
Keep 16 outputs constant. Since the fluctuation of the output voltage of the full-wave rectifier circuit 11 is detected by the voltage of the second capacitor C2 having a large capacitance, the influence of the ripple component contained in the output of the full-wave rectifier circuit 11 can be reduced.

Furthermore, since the first discharging circuit 14 and the second discharging circuit 15 are connected in parallel during discharging, the capacitances of the first, second and third diodes D1, D2, D3 can be ignored. For example, the first discharge circuit 14 and the second discharge circuit 15 at the time of discharge
The combined capacitance C _d of the first capacitor C1 is the capacitance C _C1 ,
When the capacity of the second capacitor C2 is C _C2 , C _d = C _C1 + C _C2 . If this combined capacitance C _d is set to a predetermined value, the capacitance C _C1 of the first capacitor _C1 and the second capacitor C _C1
Even if the capacity of _C2 and the capacity of _C2 are not the same, the power rectifier circuit 16
The performance of can be maintained.

On the other hand, during charging, the first discharge circuit 14 and the second discharge circuit 14
Since it is connected in series with the discharge circuit 15 of, the first discharge circuit at the time of charging is ignored if the capacitance of the first diode D1 is ignored.
The combined capacitance C _c of 14 and the second discharge circuit 15 is 1 / C _c = 1 / C _C1 + 1 / C _C2, that is, C _c = C _C1 · C _C2 / (C _C1 + C _C2 ).
Therefore, the combined capacity C is set so that the discharge condition is satisfied.
_d is kept constant, and the capacitance C _C2 of the second capacitor C2 is set to the first
If the capacitance C _C1 is different from the capacitance of the capacitor C1, for example, the capacity of more than 2 times, it is possible to reduce the combined capacitance C _c of the charging, the energy becomes CV ^2/2, the energy is lowered rush The current can be suppressed.

[0030] Then, when changing the capacitance C _C2 of the capacitor C _C1 and the second capacitor C2 of the first capacitor C1,
As shown in FIGS. 3 and 4, the capacitance C _C1 of the first capacitor C1 to volume C _C2 of the second capacitor C2 0.6
If it is 34 or less or 1.577 or more, the combined capacity C _c
Is decreased by 5%, and the combined capacity C _c is decreased by 10% when it is 0.519 or less or 1.927 or more, and the combined capacity C _c is 15% when 0.441 or less or 2.268 or more.
descend.

When the control circuit 17 is not connected,
The capacitance of either the first capacitor C1 or the second capacitor C2 may be increased.

Further, while a substantially constant combined capacitance C _d of the capacitor C _C2 of the capacitor C _C1 and the second capacitor C2 of the first capacitor C1, the first capacitor C1 capacitor C _C1 and the second When the capacitance C _{C2 of the} capacitor C2 is set to the same 47 μF as in the conventional case, a relatively large voltage fluctuation occurs as shown in FIG. 6, but the capacitance C _C1 of the first capacitor _C1 and the second capacitance C _C2 When the ratio of the capacitance C _C2 of the capacitor C ₂ is set to about 68 μF and 33 μF, respectively, as shown in FIG. 5, the voltage fluctuation of the second capacitor C 2 becomes small and the influence of ripple components etc. is small. it can.

Next, another embodiment will be described with reference to FIG.

In the embodiment shown in FIG. 7, in the circuit shown in FIG. 1, the capacitance C C2 of the second capacitor _C2 is made smaller than the capacitance C _C1 of the first capacitor C1. A series circuit of a Zener diode ZD1 and a resistor R1 as a surge voltage detection circuit is connected in parallel to the capacitor C2.

As described above, since the Zener diode ZD1 for detecting the surge voltage is connected to the second capacitor C2 having a small capacitance, it becomes sensitive to the voltage fluctuation.
The surge voltage can be detected more accurately.

That is, comparing the voltage change with respect to a surge voltage of, for example, a capacitor having a capacity of 470 μF and a capacity of 220 μF, the small capacity side shown in FIG. 8 is larger than the large capacity side shown in FIG. The sharpness increases, and the surge voltage can be easily detected.

Another embodiment shown in FIG. 7 will be described with reference to FIG.

The embodiment shown in FIG. 10 differs from the embodiment shown in FIG. 7 in that the first, second and third diodes D1,
Remove D2 and D3, and connect the resistor R2 to the first capacitor C1.
And a resistor R3 connected in parallel to the second capacitor C2.

Also in this case, the surge voltage can be easily detected as in the circuit shown in FIG.

In the case shown in FIGS. 7 and 10,
The capacitance of either the first capacitor C1 or the second capacitor C2 may be reduced.

[0041]

According to the power rectifier circuit of the first aspect,
At the time of discharging the first and second capacitors, the first discharging circuit and the second discharging circuit are connected in parallel.
The combined capacitance of the first capacitor and the second capacitor is the sum of the capacitance of the first capacitor and the capacitance of the second capacitor. When charging the first and second capacitors, the first capacitor and the second capacitor of the charging circuit Since the second capacitor is connected in series, the combined capacitance of the first capacitor and the second capacitor is the product of the capacitances of the first capacitor and the second capacitor divided by the sum, If the capacitance ratio of the first and second capacitors is doubled or more while the combined capacitance of the first capacitor and the second capacitor in the case of parallel connection is constant, the combined capacitance in the case of series connection will be small. Therefore, the inrush current can be reduced.

According to the power rectifier circuit of the second aspect, since the surge voltage detecting circuit for detecting the surge voltage is connected to one of the plurality of capacitors having the smaller capacity, the surge voltage detecting circuit is connected.
Since it becomes easy to detect a sharp change in voltage, it is possible to reliably detect a surge voltage.

According to the power supply rectifier circuit of the third aspect, the capacitance on the ground side of the plurality of capacitors is increased, and the voltage variation circuit for detecting the voltage variation of the power source circuit is connected to the side of the large capacitance. The voltage fluctuation of the power supply circuit can be detected without being affected by ripple components from the circuit.

According to the discharge lamp lighting device of the fourth aspect,
Since the load is the discharge lamp lighting circuit for lighting the discharge lamp, the load has the power supply rectifier circuit according to any one of claims 1 to 3, so that the inrush current can be reduced.

According to the lighting equipment of the fifth aspect, since the discharge lamp lighting device of the fourth aspect is incorporated in the equipment body, the inrush current can be reduced.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing an appearance of the same lighting fixture.

FIG. 3 is a graph showing a relationship between a capacitor capacity ratio and a charging capacity change%.

FIG. 4 is a graph showing a relationship between a capacitor capacity ratio and a charging capacity.

FIG. 5 is a graph showing voltage changes when capacitors having the same capacitance are used.

FIG. 6 is a graph showing voltage changes when capacitors having different capacities are used.

FIG. 7 is a circuit diagram showing a power supply rectifier circuit of another embodiment.

FIG. 8 is a graph showing a voltage change when a small-capacity capacitor is used.

FIG. 9 is a graph showing a voltage change when a large capacity capacitor is used.

FIG. 10 is a circuit diagram showing a power supply rectifier circuit of another embodiment.

[Explanation of symbols]

 12 Power supply rectifier circuit 13 Charge circuit 14 First discharge circuit 15 Second discharge circuit 16 Load discharge lamp lighting circuit 17 Control circuit as voltage fluctuation detection circuit C1 1st capacitor C2 2nd capacitor D1 1st First diode as rectifying element D2 Second diode as second rectifying element D3 Third diode as third rectifying element ZD1 Zener diode as surge voltage detection circuit

Claims (5)

[Claims] 1. A first circuit connected between output terminals of a power supply circuit.
And a second capacitor, and a charging circuit including a first rectifying element connected between the first and second capacitors in a forward direction in a charging direction of the first and second capacitors, and the first capacitor. And a first discharge circuit composed of a second rectifying element connected in the forward direction of the discharge direction of the first capacitor and connected in series with a load, and the second capacitor and the second capacitor. A power supply rectifier circuit comprising: a second discharge circuit connected in a forward direction in a discharge direction and connected in series to the load, the second discharge circuit connected in parallel to the first discharge circuit. A power supply rectifier circuit characterized in that the capacitance ratio of the first and second capacitors is doubled or more. 2. A power supply rectifier circuit in which a plurality of capacitors are connected in series between output terminals of a power supply circuit, the capacities of the plurality of capacitors are made different, and a surge voltage is generated by a voltage across a capacitor having a smaller capacity. A rectifier circuit for power supply, characterized in that a surge voltage detection circuit for detecting a voltage is connected. 3. A power supply rectifier circuit, in which a plurality of capacitors are connected in series between output terminals of a power supply circuit, wherein the capacities of the plurality of capacitors are made different, and the power is supplied by the voltage across the large-capacity capacitor among the plurality of capacitors. A power supply rectifier circuit, to which a voltage fluctuation circuit for detecting voltage fluctuations in the circuit is connected. 4. The discharge lamp lighting device according to claim 1, wherein the load is a discharge lamp lighting circuit that lights a discharge lamp. 5. A lighting fixture in which the discharge lamp lighting device according to claim 4 is incorporated in a fixture body.