Short circuit/ overcurrent protection controller and operation method

Abstract

The invention relates to a short circuit / overcurrent protection controller and an operation method. A current collection module of the controller is connected in series in a circuit to be protected, and the output end of the current collection module is accessed into an overcurrent judging latching module. A switch circuit module is a circuit of a relay or a contactor and is connected in series in the circuit to be protected. The overcurrent judging latching module comprises an overcurrent judging state latching circuit and a switch control circuit, and the output end of the overcurrent judging latching module is accessed into the switch circuit module to control connection or disconnection of the relay or the contactor. The operation method is that high level output by a voltage comparator of the overcurrent judging latching module controls the switch control circuit to connect the circuit of the relay of the switch circuit module and connect the circuit to be protected at the beginning of electrification, and low level output by the voltage comparator cuts off the circuit of the relay of the switch circuit module and maintains latching when short circuit or overcurrent happens. The short circuit / overcurrent protection controller monitors the circuit to be protected in real time, cuts off the circuit immediately when short circuit or overcurrent happens, effectively protects load and a power supply, automatically latches the protection state and can randomly set the protection current value.

Description

(1) Technical field [0001] The invention relates to the technical field of overcurrent protection in circuits, in particular to a short circuit / overcurrent protection controller and an operating method. (2) Background technology [0002] When the circuit fails, a short circuit may occur, and the instantaneous working current tends to infinity; or the current value may increase rapidly beyond the set allowable value, that is, an overcurrent occurs. In order to protect the load and power supply during short circuit or overcurrent, it is necessary to cut off the circuit immediately, so a short circuit / overcurrent protector is designed. Commonly used short circuit / overcurrent protection products mainly include fuses, circuit breakers and microprocessor-based overcurrent protection modules. When the current passing through the fuse is greater than a certain value, the fuse will be blown immediately. When it plays a protective role, the fuse will be burned by short-circuit curren...

AI Technical Summary

Problems solved by technology

Microprocessor-based overcurrent protection products can use software to set the overcurrent protection current arbitrarily, and can be used repeatedly, but because the core is a microprocessor, it relies on compiled software to achieve short circuit / overcurrent protection, so the reliability is low , and the cost is higher

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