A self-resetting switch circuit and control method based on feedback control

Abstract

The invention discloses a self-reset switch circuit based on feedback control, which comprises a PMOS tube, an input optocoupler, an output optocoupler, a self-reset switch and a controller. The first voltage dividing resistor is connected to the first current limiting resistor, and the connection point of the first voltage dividing resistor and the first current limiting resistor is connected to the collector of the output end of the input optocoupler through the second voltage dividing resistor, and the input end of the input optocoupler The anode is connected to the high potential, the input terminal cathode of the input optocoupler is connected to the controller, the input terminal anode of the output optocoupler is connected to the power output terminal, and the self-reset switch is connected in series with the input terminal cathode of the output optocoupler and the output terminal of the input optocoupler Between the emitters, the collector of the output end of the output optocoupler is also connected to the controller, and the emitter of the output end of the output optocoupler is grounded. The invention can be applied to a high current environment, helps to reduce the volume of the switch circuit, can reduce the surge impact during abnormal switching on and off, and can prevent the load equipment from being powered on and off involuntarily.

Description

Technical field [0001] The present invention relates to a switching control circuit, and more particularly to a feedback control, a self-reciprocating switching circuit and a control method. Background technique [0002] In the prior art, common self-locking power switching circuits, mostly through two contacts of normally open or normally closed, this turmoil control method has the following three main disadvantages: [0003] First, when the current is too large, consider the current limiting requirements, causing the circuit to be very large, it is inconvenient to install and use; secondly, the power is powered down when the power supply is powered down, trip, and the trip is turned down. When the circuit is recovered on the circuit The self-locking switch in the on state will turn the load device to power up. At this time, the surge on the power line will have a large adverse effect on the equipment, especially when the abnormal situation is repeated, will make the load device...

AI Technical Summary

Problems solved by technology

[0003] First of all, when the current is too large, the current limiting requirements are considered, resulting in a very large circuit size, which is inconvenient to install and use; secondly, when the power supply has abnormal phenomena such as power outages and trips, power failure will occur. When the circuit is powered on and restored , the self-locking switch in the conduction state will power on the load equipment immediately. At this time, the surge on the power supply line will have a greater adverse effect on the equipment, especially when the abnormal situation occurs repeatedly, it will make the load equipment frequent Non-autonomous power on and off seriously affects the life of the equipment; in addition, the existing self-locking power switch cannot realize program-controlled shutdown, which is difficult to meet application requirements

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