JPS60110023A - Power supply control circuit - Google Patents

Abstract

PURPOSE:To omit a power supply transformer and to attain a lightweight structure of a power supply control circuit with reduction of the cost, by connecting the main and secondary rectifying circuits directly to an AC power supply with a thyristor connected to the main rectifying circuit and controlling the gate of the thyristor with the power supply of the secondary rectifying circuit. CONSTITUTION:An AC power supply is connected directly to a main rectifying circuit 23, and a thyristor 24 is inserted in series to the other end of the circuit 23. While a secondary rectifying circuit is provided with a resistance 28, a diode 29 and a smoothing capacitor 30. This secondary rectifying circuit is also connected directly to the AC power supply. The output side of the secondary rectifying circuit is connected directly to the stabilizing circuit 31 and also to a control circuit 32 of the thyristor 24. The power supply to a TV receiver is controlled by the thyristor 24. In other words, the power supply control signal is received by a remote control receiver 34 from a remote control transmitter 33 and converted into the DC control voltages by the circuit 32. Thus the thyristor 24 is controlled. The stabilizing circuit 31 supplies the DC power to the circuit 32.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a power supply control circuit that takes into account the seven possible risks when used in wireless remote control circuits for television receivers, video tape recorders, audio equipment, etc. It is.

Conventional Structure and Problems Therein FIG. 1 shows an example of a remote control power supply control circuit in a conventional television receiver. In the figure, 1 is a main power switch, 2 is a fuse, 3 is a main rectifier circuit, 4 is a smoothing capacitor, 6u is a stabilizing circuit, and a load circuit such as a 6-digit television receiver. 7 is the power transformer for the remote control circuit, 8 is the sub-rectifier circuit, 9 is the smoothing capacitor, 10 is the stabilization circuit, 11 is the control circuit, 12 thyristor, 13 remote control transmitter, 14 is the remote control It is a receiver.

Next, the operation of this circuit will be explained.

A thyristor 12 controls the power on and off of the television receiver. That is, a power control signal from a remote control transmitter 13 is received by a remote control receiver 14, converted to a DC control voltage by a control circuit 11, and the gate 12 of the cyrisk is controlled iIfIJ. This circuit supplies direct current to the power transformer 7, sub-rectifier circuit 8, smoothing capacitor 9, stabilizing circuit 10d, and control circuit 11.

However, in this circuit, when the AC power supply and the sub-rectifier circuit 8 are connected directly, the ground side of the main rectifier circuit 3 becomes the same potential as the ground circuit, and the power supply transformer 7 is absolutely necessary, in order to avoid being unable to control the power supply on and off. There was a drawback.

Purpose of the Invention The present invention provides a remote control for use in television receivers, etc., which eliminates the above-mentioned drawbacks of the conventional technology, and which reduces costs and reduces the weight of printed circuit boards by eliminating the disadvantages of the conventional lances. - The object is to provide a power supply control circuit for a roll circuit.

Structure of the Invention In the present invention, the AC power supply side and the main rectification circuit are directly connected, the AC power supply side and the sub-rectification circuit are directly connected, and the ground side of the main rectification circuit is directly connected to the ground, and the output side of the main rectification circuit and the stabilization circuit are directly connected. A circuit is inserted between the circuit and the load circuit, and the gate of the circuit is controlled by the control circuit VC.

Then, the output of the sub-rectifier circuit is used for the power supply of the J-control circuit and the remote control circuit, and the transformer can be eliminated, thereby reducing costs and the weight of the printed circuit board.

Furthermore, leakage flux generated from the power transformer does not affect other circuits.

DESCRIPTION OF EMBODIMENTS A power supply control circuit according to an embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, 21 is the main power switch, 22 is the fuse, 23 is the main rectifier circuit, 24 is the thyristor, 25 is the smoothing capacitor, 26 is the stabilizing circuit, 2 is the load of the television receiver, and 28 is the dropper. Resistor, 29 is sub-rectifier circuit, 30 is smoothing capacitor, 3
1 is a stabilizing circuit, 32 is a control circuit, 33 is a remote control transmitter, and 34 is a remote control receiver.

In this power supply circuit, the AC power supply side is directly connected to the main rectifier circuit 23, and the DC 111 power 111 of the main rectifier circuit 23 is connected directly to the main rectifier circuit 23.
Connect one end of 11 directly to ground, and connect Cyrisk 2 to the other end.
4 in series for direct connection. On the other hand, a resistor 28, a diode 29, and a smoothing capacitor 31 constitute a sub-rectifier circuit, and this sub-rectifier circuit is also directly connected to the AC power supply side. Furthermore, the output side of this sub-rectifier circuit is connected to a stabilizing circuit 31.
furthermore, the control circuit 32 of the thyristor 24
Connect directly to. The output side of this control circuit 32 is directly connected to the gate of Cyrisk 24.

Next, the operation of the circuit for V will be explained.

The power supply control for the television receiver is performed by the thyristor 24, 1
: Do it. That is, the remote control transmitter 33
The power supply control circuit from the remote control receiver 34
The control circuit 32 converts the voltage into a DC control voltage to control the gate 24 of the Cyrisk. Note that the dropper resistor 28, the sub-rectifier diode 29, the smoothing capacitor 30, and the stabilizing circuit 31 are circuits that supply DC power to the control circuit 32, and are directly connected to the AC power supply.

Therefore, according to such a circuit, the power transformer can be removed, resulting in cost reduction and reduction in board weight.Furthermore, the cage flux generated from the power transformer can be transferred to other circuits. No impact.

According to the present invention, since the AC power supply is directly connected to the main rectifier circuit and the sub-rectifier circuit, the power transformer can be removed, thereby reducing costs and reducing printed circuit boards. weight reduction can be achieved. Moreover, it has great practical effects, such as leakage flux generated from the power transformer that does not affect other circuits.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power supply control circuit in a conventional example, and FIG. 2 is a block diagram of a power supply control circuit in an embodiment of the present invention. 23...Main rectifier circuit, 24...Sirisk, 28...Resistor, 29...Diode, 30...Smoothing capacitor, 31・・・
... Stabilization circuit, 32 ... Control circuit.

Claims (1)

[Claims] 711; The AC power supply side of the source rir+ path and the main rectifier circuit, the AC power supply side and the sub-rectifier circuit, the input side of the main rectifier circuit or (
A power supply control circuit in which a thyrisk or bidirectional thyristor connected in series with the r1 output side, the output side of the l-array rectifier circuit, and the control circuit for the thyristor or bidirectional thyristor are all directly connected.