D.C. voltage stabilizing power source switching control apparatus

Abstract

The invention discloses a DC stabilized voltage power supply switch control device, which comprises a hand switch which is a normally open type key switch for manual switch control; a control signal input terminal which is used for inputting automatic switch control signal; a 555 timer which has TH and / TL pins connected with the hand switch, a / RES pin connected with the control signal input terminal, and an OUT pin connected with a clock pin of a D trigger; the D trigger which has a D pin directly connected with a / Q pin, a Q pin and / or the / Q pin connected with a power supply control unit for outputting a switch control signal; and the power supply control unit which is used for carrying out switch control according to the switch control signal from the D trigger. The stabilized voltage power supply control device can be controlled through an external signal or manually through the normally open type key switch and has simple circuit, good stability and high reliability.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a DC stabilized power switch control device. Background technique [0002] In electronic circuits such as communications and electronic instruments, in order to control the power-on and power-off states of the circuit, it is often necessary to switch on and off the DC regulated power supply that supplies power to it. Among them, the more commonly used control means are: automatic control of the switch state of the power supply through an external input control signal, manual control of the switch state of the power supply through a switch or a button, etc. These two control methods are suitable for different occasions, but with the improvement of system integration and the diversification of user needs, many systems often need to use both automatic and manual power control methods at the same time. [0003] In the case of using an external signal for automatic control, as long as...

AI Technical Summary

Problems solved by technology

However, it can only support switch button control mode and cannot support automatic control mode, and the buttons used are also traditional mechanical toggle switches, which do not support normally open buttons

[0008] The existing regulated power supply control device cannot support the manual control mode of the normally open button, and the manual control and automatic control cannot be operated at the same time

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