Novel surge control circuit

Abstract

The invention relates to a novel surge control circuit and belongs to the technical field of electronic circuits. A relay rapidly works and is closed at the moment of powering-on. A power supply supplies power to a load through a thermistor NTC. Because of the characteristics of the thermistor NTC, supply current is kept in a stable and constant current state. When a capacitor in a load circuit is charged and works stably, the relay is opened, the power supply supplies power to the load through the normally-closed contact of the relay. Since the thermistor NTC and the normally-closed contact of the relay are connected in parallel, the thermistor NTC is disconnected and stops working. By detecting input voltage through an instantaneous comparison amplifier, when the power supply is turned off and is turned on again, the instantaneous comparison amplifier can output a resetting signal to reset a time-delay switching circuit, so as to ensure that the switching time of a time-delay switch is stable and the misoperation is eliminated when the time-delay switch is turned on or off at each time. Therefore, the requirement on the instantaneous power of the power supply is reduced, the damage rate of the thermistor NTC is greatly decreased, the power supply cost is reduced, the power consumption is extremely low because the novel surge control circuit is in a static state after surge control work is completed, and the common practicability and the good economic and technical efficiency are realized.

Description

technical field [0001] The invention relates to a new type of surge control circuit, in particular to a kind of surge generated by a large current at the moment of power-on due to the presence of a capacitive load in the load circuit, so that it can work in a stable power supply state, which belongs to the electronic circuit technology field. Background technique [0002] In many electronic circuits, a large number of electrolytic capacitors are used, so when the power is initially turned on, the electrolytic capacitors must be charged, and the instantaneous current is very large, generally 8-10 times the operating current. The requirements for instantaneous power supply of the power supply have been increased. Whether it is a direct power supply from the mains or a switching power supply, there are requirements for the initial load capacity and power supply lines. It is not conducive to energy saving and line security. [0003] Existing electronic technology generally use...

AI Technical Summary

Problems solved by technology

Not conducive to energy saving and line security

[0003] Existing electronic technology generally uses the thermistor NTC connected in series in the power supply line to eliminate the surge, but there is a phenomenon of power loss increase and thermistor NTC self-heating when the thermistor NTC is working online, and even Will cause damage to the thermistor NTC

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