Automobile electronic high-current over-current protection circuit

Abstract

The invention relates to an automobile electronic high-current over-current protection circuit comprising a MOS transistor driving circuit, an operational amplifier circuit, and a protection circuit.The input end of the MOS transistor driving circuit is connected with the output end of a driving control module. The output end of the MOS transistor driving circuit is connected with a load module.The input end of the operational amplifier circuit is connected to the output end of the MOS transistor driving circuit. The output end of the operational amplifier circuit is connected to the inputend of the protection circuit. The output end of the protection circuit is connected to the input end of the MOS transistor driving circuit. The automobile electronic high-current over-current protection circuit improves the over-current protection capability of a power circuit and reduces the cost of a controller system.

Description

technical field [0001] The invention relates to an overcurrent protection circuit, in particular to a large current overcurrent protection circuit for automobile electronics. Background technique [0002] Conventional overcurrent protection circuits are mainly aimed at overcurrent protection for small currents, while overcurrent protection designs for large currents mainly use integrated devices, which have high costs. At the same time, there are few existing models of integrated devices and low selectivity. Some high-current overcurrent protection designs use the sampling resistor scheme. By sampling the current of the sampling resistor, and then using the software algorithm to realize the protection of the load, this scheme has the disadvantage of slow response time, and even cannot realize the timely protection of the controller. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a large-current overcurrent prote...

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Problems solved by technology

[0002] Conventional over-current protection circuits are mainly aimed at low-current over-current protection, while high-current over-current protection designs mainly use integrated devices, which have high costs. At the same time, there are few existing models of integrated devices and low selectivity.

Some high-current overcurrent protection designs use the sampling resistor scheme. By sampling the current of the sampling resistor, and then using the software algorithm to realize the protection of the load, this scheme has the disadvantage of slow response time, and even cannot realize the timely protection of the controller.

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