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1. (WO2018076714) INTERFACE PROTECTION CIRCUIT

Pub. No.:    WO/2018/076714    International Application No.:    PCT/CN2017/088455
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Fri Jun 16 01:59:59 CEST 2017
IPC: H02H 3/20
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: MA, Haibo
马海波
LI, Xianyin
李先银
ZHANG, Yongjin
张勇进
CHENG, Cheng
程程
ZHANG, Hao
张浩
Title: INTERFACE PROTECTION CIRCUIT
Abstract:
An interface protection circuit, used for protecting an interface device so that reset or interface failure is less likely to occur. The interface protection circuit comprises: an analog video signal wire input end, an analog video signal ground wire input end, an analog video signal wire output end, an analog video signal ground wire output end, a first protection module (302), and a second protection module (303). The first protection module is separately connected to the analog video signal wire input end, the analog video signal wire output end, and the analog video signal ground wire input end; the second protection module is connected between the analog video signal ground wire input end and the analog video signal ground wire output end. The first protection module comprises an MOSFET and a voltage regulator; the MOSFET turns off when the voltage regulator detects that the voltage value of the analog video signal wire is greater than a preset voltage value, so that the analog video signal wire input end and the analog video signal wire output end are disconnected. The second protection module comprises a capacitor for separating direct current voltages.