JPH05257548A - Power supply device, lighting device, and illuminator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lighting device capable of effectively utilizing parts without deteriorating the function. [Structure] AC power from a commercial AC power supply E is full-wave rectified by a full-wave rectifier 1, and a pulsating flow is supplied to a chopper means 3.
When the DC power supply 2 is turned on, the inverter circuit 5 does not oscillate, the light emitting diode LED does not illuminate, and the phototransistor PTr remains off. Since the thyristor Th1 remains off and the current flows through the resistor R1, the inrush current is reduced by the resistor R1. When the inverter circuit 5 operates and the light emitting diode LED lights up, the phototransistor PTr turns on and the thyristor Th1
A gate voltage is applied to the thyristor Th1 to turn it on. The thyristor Th1 bypasses the current of the resistor R1, and the thyristor Th1 of the chopper means 3 performs a circulating function in the step-up chopper.

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 lighting device and a lighting fixture using a chopper means.

[0002]

2. Description of the Related Art Conventionally, for example, a configuration shown in FIG. 3 is known as a power supply device using a chopper means.

As shown in FIG. 3, a commercial AC power source E is connected to a full-wave rectifier 1, and a smoothing capacitor C1 is connected between output terminals of the commercial AC power source E. E, a full-wave rectifier 1 and a capacitor C1 constitute a DC power supply 2, and a chopper means 3 is connected to this DC power supply 2 through a parallel circuit of a thyristor Th1 for preventing an inrush current and a resistor R1.

The chopper means 3 connects the switching element Q1 between the output terminals of the DC power source 2 through the thyristor Th1 and also connects the inductor L1 in series with the switching element Q1 as seen from the full-wave rectifier 1. Further, a free-wheeling diode D1 and a smoothing capacitor C2 are connected to the output side via the diode D1.

Inrush current control means 4 is connected to the gate of thyristor Th1. The inrush current control means 4 is composed of resistors R2, R3, R4, R5 and a capacitor C3.

Further, an inverter circuit 5 is connected in parallel with the capacitor C2, and a discharge lamp FL is connected to the inverter circuit 5.

Next, the operation of the circuit shown in FIG. 3 will be described.

First, when the DC power supply 2 is turned on, the resistance R1
Power is supplied to the chopper means 3 via. That is, when the DC power supply 2 is turned on, the capacitor C3 is not charged, so the gate voltage is not supplied to the thyristor Th1, the thyristor Th1 is kept in the off state, and the inrush current is prevented from being input to the chopper means 3. .

After a predetermined time has passed, the capacitor C3
When is charged, a gate voltage is applied to the gate of the thyristor Th1, the thyristor Th1 is turned on, the electric power from the DC power supply 2 is input to the chopper means 3 via the thyristor Th1, and the chopper means 3 performs a boosting operation. , Power is supplied to the inverter circuit 5 to turn on the discharge lamp FL.

[0010]

However, in the case of the configuration shown in FIG. 3, the thyristor Th1 and the diode D1 are connected in series, and the thyristor Th1 has only a function as a switching element, and the DC power supply 2 is turned on. After a lapse of a predetermined time thereafter, connecting elements having no particular action and having the same rectifying function in series has a problem that it cannot be said that the parts are effectively used.

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 lighting device, and a lighting fixture capable of effectively utilizing the components without deteriorating the function.

[0012]

A power supply unit according to claim 1 has a rectifying means for free-flowing, said rectifying means being connected between a DC power source and a load, said rectifying means being connected between said DC power source and said load. A power supply device including an intervening chopper means, wherein the free-flow rectifying means is composed of switching elements having resistors connected in parallel and having a rectifying function. It is controlled by an inrush current control means which maintains a conductive state and controls conduction after a predetermined time has passed after the DC power supply is turned on.

According to a second aspect of the present invention, there is provided a lighting device in which a lighting means for lighting a lamp is connected to the power supply device according to the first aspect.

According to a third aspect of the present invention, in the lighting fixture, the lighting device according to the second aspect is built in the main body of the fixture to turn on the lamp.

[0015]

In the power supply apparatus according to the present invention, the rectifying means for circulating current, which is connected between the DC power source and the load, is composed of switching elements having a rectifying function, the resistors being connected in parallel, and inrush current control. With the means, the non-conduction state is maintained when the DC power source is turned on, and the conduction control is performed after a predetermined time has passed after the DC power source is turned on. Therefore, when the DC power source is turned on, an excessive inrush current is prevented,
After a predetermined time after the DC power supply is turned on, since it has a function as a rectifying means for circulating current, it is possible to effectively use parts compared with the conventional one, and in particular, one rectifying means for a large current can be omitted. It is possible to reduce the price and size.

In the lighting device according to the second aspect, since the lighting means for lighting the lamp is connected to the power supply device according to the first aspect, the number of large parts can be reduced and the parts can be effectively used as compared with the conventional one.

According to the third aspect of the present invention, since the lighting device according to the second aspect is built into the main body of the luminaire and the lamp is turned on, the parts can be effectively used as compared with the prior art.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the power supply device of the present invention will be described below with reference to the drawings. The parts corresponding to those of the conventional example shown in FIG.

In FIG. 2, reference numeral 11 denotes an instrument body, a reflecting surface is formed on the lower surface of the instrument body 11, and lamp sockets 12, 12 are attached to both ends of the reflecting surface, and between the lamp sockets 12, 12. Is connected to a discharge lamp FL.
In addition, the circuit shown in FIG. 1 is built in the instrument body 11.

As shown in FIG. 1, the commercial AC power source E is connected to a full-wave rectifier 1 for full-wave rectification, and the commercial AC power source E and the full-wave rectifier 1 constitute a DC power source 2. Chopper means 3 is connected between the output terminals of the power supply 2.

This chopper means 3 connects a switching element Q1 via an inductor L1 between the output terminals of a DC power supply 2, and outputs it via a circulating thyristor Th1 having a rectifying function and a switching function as rectifying means. Connect the smoothing capacitor C1 to the side.

A resistor R1 for reducing inrush current is connected in parallel with the thyristor Th1.

Further, a part of the inrush current control means 4 is connected to the gate of the thyristor Th1, and the inrush current control means 4 is composed of a resistor R2, a phototransistor PTr, a capacitor C4 and a rectifying circuit 6. The rectifier circuit 6 rectifies the output of the inductor L2 which is magnetically coupled to the inductor L1.

An inverter circuit 5 as a load and a lighting means is connected in parallel to the capacitor C2, and the inverter circuit 5 lights the discharge lamp FL.

The other part of the inrush current control means 4 is connected to the inverter circuit 5, and the inrush current control means 4 includes an oscillation circuit 7, a resistor R7 and a phototransistor PT.
It is composed of a light emitting diode LED photocoupled to r.

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

The AC power from the commercial AC power source E is full-wave rectified by the full-wave rectifier 1, and the pulsating current is supplied to the chopper means 3.

First, when the DC power supply is turned on, the inverter circuit 5 does not oscillate, and therefore the light emitting diode LED does not illuminate and the phototransistor PT
Since r remains in the off state, the thyristor Th1 remains in the off state, and the current flows through the resistor R1, so that the rush current is reduced by the resistor R1.

When the inverter circuit 5 operates and the light emitting diode LED lights up, the phototransistor PTr is turned on, the gate voltage is applied to the thyristor Th1, the thyristor Th1 is turned on, and the current of the resistor R1 is bypassed. Thyristor Th1 operates as a perfusion function.
The power supply of the gate current to the thyristor Th1 is obtained by rectifying the induced voltage of the inductor L2 by the rectifier circuit 6.

Further, in the chopper means 3 after the thyristor Th1 is turned on, in the period in which the pulsating voltage is a low voltage in one cycle, that is, in the rising period of the pulsating voltage,
When the switching element Q1 is turned on, a current flows from the full-wave rectifier 1 through the inductor L1 and gradually rises. On the other hand, when the switching element Q1 is turned off, the current of the switching element Q1 is cut off, but the inductor L1
Releases the stored energy through the thyristor Th1 for circulation and the condenser C2 for smoothing. Therefore, current starts to flow in the thyristor Th1 from the time when the switching element Q1 is turned off. And the switching element Q1
During the off period of, the energy of the inductor L1 gradually decreases, and the current flowing through the inductor L1 also decreases.

Next, when the switching element Q1 is turned on again, the above operation is repeated. Then, as the pulsating current voltage increases toward the peak value in one cycle, the current flowing through the switching element Q1, that is, the current flowing from the full-wave rectifier 1, increases in accordance with the voltage increase.

[0032]

According to the power supply device of the first aspect, the rectifying means for circulation, which is connected between the DC power source and the load, is composed of switching elements having resistors connected in parallel and having a rectifying function. The inrush current control means maintains the non-conduction state when the DC power source is turned on and controls conduction after a predetermined time after the DC power source is turned on.Therefore, when the DC power source is turned on, an excessive inrush current is prevented and a predetermined value after the DC power source is turned on. After the time, it has a function as a rectifying means for recirculation, so that the parts can be used more effectively than before, and in particular, one rectifying means for a large current can be omitted. Can be possible.

According to the lighting device of the second aspect, since the lighting means for lighting the lamp is connected to the power supply device of the first aspect, it is possible to reduce the number of large parts and to effectively use the parts, as compared with the conventional one. You can

According to the lighting equipment of the third aspect, since the lighting device of the second aspect is built in the main body of the equipment and the lamp is turned on, it is possible to effectively use the parts as compared with the conventional case.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a lighting fixture incorporating the above lighting device.

FIG. 3 is a circuit diagram showing a conventional power supply device.

[Explanation of symbols]

 2 DC power supply 3 Chopper means 5 Inverter circuit as load and lighting means E Commercial AC power supply FL discharge lamp Th1 Thyristor as rectifying means

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Claims (3)

[Claims] 1. A power supply device having a rectifying means for circulating current, comprising: a rectifying means connected between a DC power source and a load; and a chopper means interposed between the DC power source and the load. The circulating rectifying means is composed of a switching element having resistors connected in parallel and having a rectifying function, and the switching element maintains a non-conduction state when the DC power is turned on, and a predetermined time after the DC power is turned on. A power supply device characterized by being controlled by an inrush current control means for controlling conduction. 2. A lighting device comprising the power supply device according to claim 1 connected to a lighting means for lighting a lamp. 3. A lighting fixture, characterized in that the lighting device according to claim 2 is built in a main body of the fixture to light a lamp.