JPS58136233A - Power source control circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a power supply circuit for a television receiver.

Recently, color television receivers in particular are increasingly being used in combination with VTRs, television cameras, etc., and it has become common for receivers to have chassis insulated to accommodate these devices.

Since the method of using a power transformer as an insulating means causes problems in terms of weight and storage, a switching power supply method is used.
A common method is to isolate the switching transformer to separate the primary and secondary circuits.

In addition, remote control devices have recently become popular, and when used in combination with this to turn on and off the receiver's LLE source, one of the sets is required.
The following method of controlling the WL11i11 circuit has become common. However, since the remote control device controls each adjustment function of the receiver, it needs to be at the same reference potential as the secondary circuit of the receiver. It must be isolated from the machine's primary circuit.

Conventionally, insulation I! is generally used as a means of insulation. ) Control signals were transmitted using a lance, but the F lance method requires insulation distance and dielectric strength according to the safety standards of the destination country (for example, 21@e4Kv in the UK), is large in size, and has a large weight. It was also heavy, and the edible bacteria were heavy due to the transformer coupling, and the drive control circuit was complicated and expensive.

The object of the present invention is to provide a simple circuit conduit for insulating means for power supply control.

The present invention uses ultrasonic waves as an insulating means to ensure the necessary clearance distance (for example, 81 III or more in the UK), and also transmits two types of control signals necessary for turning on and off the IE power supply circuit using a pair of ultrasonic waves. A power supply circuit is intended to be controlled by a drive circuit consisting of a pulse gate and an amplitude layering circuit using a transmitter/receiver. Figure 1 shows a block diagram according to the present invention. The voltage is controlled to be constant by a constant voltage control circuit 5 including a switching transformer 4 via a voltage source 2, and is supplied to a secondary circuit 9 of a load. Next, the remote control device (receiver side) 7 adds the output signal from the remote control device transmitter side to the control signal transmission g8 and transmits it to the control signal receiving section 6 via ultrasonic waves. There are two types of signal contents to be transmitted: a pulse (on) signal and a binary signal (off) signal as shown in FIG.

The signal detected by the receiving section 6 is identified as on/off by the drive circuit 5, and the constant voltage control section 5 starts or stops the operation according to the signal conditions. Since the constant voltage control circuit 5 has stopped operating, the output of the 5th power source circuit is turned off, and the gate circuit is therefore closed, so the on control signal is transmitted to the drive circuit 14, and the constant voltage control circuit is activated. do.

On the other hand, since the pulse signal applied to the integrating circuit 12 is integrated and its peak value does not exceed the threshold of the driving circuit, malfunctions do not occur.

On the other hand, when the step signal is off, the step signal is applied to the integration circuit 12, and when it becomes longer than the integration time constant, the peak value exceeds the threshold value, so it is transmitted to the drive circuit 14, and the operation of the constant voltage control section 3 is stopped.

According to the present invention, the insulation T means can be easily made inexpensive and lightweight. Also, one control path (one pair of transmitter and receiver)
The circuit can be simplified.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...AC manual power, 2...Receiver rectifier circuit, S...constant voltage control circuit, 4...Switching silance, 5...Drive circuit, 6...Control signal receiving section, 7
...Remote control device (receiver side) 8...Control Il signal transmitter, 9...Secondary circuit of receiver, 10...Non-insulated part of receiver, 11...5 Next tIls 12...Integrator circuit,
15... Gate circuit, 14... On/off drive circuit.

Claims (1)

[Claims] In a power supply circuit that is insulated and controlled (conduction/cutoff), a pair of transceivers using ultrasonic waves is used as a control signal transmission means, and the signal content is a pulse/binary potential corresponding to continuity/cutoff. 1. A power supply control circuit characterized in that the receiver side selects and controls the 211 signals by means of pulse gate/amplitude separation means.