Voltage surge protection system

Abstract

The invention provides a voltage surge protection system. The voltage surge protection system comprises a voltage surge detection control circuit and a surge protection switch circuit. A first end ofthe voltage surge detection control circuit is connected with a power supply input terminal and is used for carrying out front-end surge detection; a second end of the voltage surge detection controlcircuit is connected with a control terminal of the surge protection switch circuit, and the voltage surge detection control circuit is used for controlling the surge protection switch circuit according to a front-end surge detection result; and the surge protection switch circuit is arranged between a power supply output terminal and a circuit device needing surge protection, and is used for carrying out rear-end surge protection under the control of the voltage surge detection control circuit. According to the voltage surge protection system provided by the invention, a mode of front-end surge detection and rear-end surge protection control is adopted, the inherent delay from the power supply input terminal to the power supply output terminal is fully utilized, so that the response timeof the voltage surge detection control circuit and the surge protection switching circuit is counteracted; and compared with the prior art, the voltage surge protection system has a better response effect.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of circuit safety, and in particular to a voltage surge protection system. Background technique [0002] The voltage surge protection circuit is the core protection unit in the electronic system. Its function is to detect the voltage surge state in the electronic system and control the electronic system to prevent the damage of the electronic system caused by the voltage surge. [0003] The voltage surge protection circuit in the prior art such as figure 1 shown. see figure 1 , the existing voltage surge protection circuit performs surge detection at the output end of the DC power supply. After the surge voltage is detected at the output end, the optocoupler is triggered to work, and the CE pole voltage of the optocoupler is pulled down to the input ground GND1, and the driving voltage of Q1 drops to Low level, Q1 is turned off, disconnecting the path between the input ground and the...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the use of the back-end surge detection scheme, the surge voltage is detected at the output of the DC power supply, and there is an inherent detection delay

[0006] (2) Due to the front-end shutdown surge scheme, when the input voltage is high, the CE pole of the optocoupler withstands the input voltage, so it is not suitable for high-voltage input and low-voltage output occasions

[0007] (3) Since the front-end shutdown surge scheme is adopted, the input power supply is forced to be shut down during the surge, and all loads stop working, so it has a great impact on the system

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