Power-on time-delay power-down quick turn-off control device based on capacitance characteristics

Abstract

The invention discloses a power-on time-delay power-down rapid turn-off control device based on capacitance characteristics. The device comprises a main power supply, an over-current protection circuit, a switching circuit, a main capacitor, a charging and discharging circuit used for charging or discharging the main capacitor, a switch driving circuit used for controlling the switching circuit tobe in one of a conduction state and a cut-off state according to a voltage signal of the main capacitor, and an output circuit used for outputting pure voltage. The output end of the main power supply is connected with the input end of the over-current protection circuit, the switching circuit, the charging and discharging circuit, the switch driving circuit and the output circuit are all connected with the output end of the over-current protection circuit, and the switch driving circuit is connected with the charging and discharging circuit through the main capacitor. According to the invention, a controlled delay time is obtained by controlling the charging and discharging time of the charging and discharging circuit to the main capacitor to turn on the control switch of the main circuit, so that delay of the output power supply of the main circuit is realized; and during power failure, the main capacitor is quickly short-circuited and discharged to control the quick turn-off of theoutput power supply of the main circuit.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a control device for power-on delay and power-off rapid shutdown based on capacitance characteristics. Background technique [0002] At present, in the field of electronic circuits, the control application of power-on delay start and power-off quick shutdown of power supplies is very extensive. In the prior art, delay control is generally realized through delay relays, delay switches or single-chip delays. . However, these solutions all have the problems of high cost and untimely rapid shutdown. At the same time, the application range of this kind of general-purpose delay and quick-break control device is quite wide. How to design and produce a low-cost, fast-turn-off and timely device has become a technical problem that needs to be solved urgently in this field. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the object of the pre...

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Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a control device based on the power-on delay and power-off fast shutdown based on the capacitance characteristic, which can solve the high production cost of the traditional time-delay and fast-break control device and the The problem of untimely quick shutdown

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