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Title:
LOW-COST INPUT ANTI-OVERVOLTAGE PROTECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/169904
Kind Code:
A1
Abstract:
A low-cost input anti-overvoltage protection circuit capable of monitoring the magnitude of an AC input voltage in real time and controlling on/off of a switch device in a chopper circuit by means of a control circuit. When the AC input voltage is increased abnormally, the control circuit can quickly detect and control the switch device in the chopper circuit to be in the on/off state, maintain the energy-storage capacitor voltage, so as to quickly and effectively protect a back-stage circuit, prevent an energy-storage capacitor and a switch tube of the back-stage circuit from being damaged due to high voltage, and the back-stage circuit can continue working normally. Compared with the prior art, the low-cost input anti-overvoltage protection circuit is applicable to the situation and the condition that the abnormal overvoltage of the power network voltage may occur such as ground fault, the reaction speed is fast, the circuit is simple and reliable, the cost is low, the EMC performance is excellent, the design is flexible, and the protective threshold can be adjusted.

Inventors:
LUO, Hao (NO.5 Kehui St. 1, Kehui Development Center Science Ave., Guangzhou Science City, Development Distric, Guangzhou Guangdong 3, 510663, CN)
SONG, Jianfeng (NO.5 Kehui St. 1, Kehui Development Center Science Ave., Guangzhou Science City, Development Distric, Guangzhou Guangdong 3, 510663, CN)
CHENG, Zhiyong (NO.5 Kehui St. 1, Kehui Development Center Science Ave., Guangzhou Science City, Development Distric, Guangzhou Guangdong 3, 510663, CN)
Application Number:
CN2018/116951
Publication Date:
September 12, 2019
Filing Date:
November 22, 2018
Export Citation:
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Assignee:
MORNSUN GUANGZHOU SCIENCE & TECHNOLOGY CO., LTD. (NO.5 Kehui St. 1, Kehui Development Center Science Ave., Guangzhou Science City, Development Distric, Guangzhou Guangdong 3, 510663, CN)
International Classes:
H02H9/04
Foreign References:
CN107026578A2017-08-08
CN108206517A2018-06-26
CN207926178U2018-09-28
CN203026904U2013-06-26
CN205544985U2016-08-31
US4484257A1984-11-20
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (Room 2305-06 Yuehai Group Building, 555 Dong Feng Dong Road Yuexiu Distric, Guangzhou Guangdong 0, 510050, CN)
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