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Automobile electronic high-current over-current protection circuit

An overcurrent protection circuit and automotive electronics technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of slow response time, low selectivity, and inability to realize timely protection of the controller, etc. problems, to achieve fast response time and reduce costs

Pending Publication Date: 2018-10-19
上海拓为汽车技术有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

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.

Method used

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  • Automobile electronic high-current over-current protection circuit

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Embodiment Construction

[0012] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0013] Embodiments of the present invention relate to a large current overcurrent protection circuit for automotive electronics, such as figure 1 As shown, it includes a MOS tube drive circuit, the input terminal of the MOS tube drive circuit is connected to the output of the drive control module, the output terminal is connected to the load module, and an operational amplifier circuit and a protection circuit are also included...

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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...

Claims

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Application Information

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IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 李连杰唐月强蒋开洪郑鸿云
Owner 上海拓为汽车技术有限公司
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