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Title:
OVERCURRENT PROTECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/015224
Kind Code:
A1
Abstract:
An overcurrent protection circuit comprises: a current transformer (T2), wherein a primary side winding thereof (Na) is in series with a primary side winding (Np) of a transformer (T3), and one terminal of a secondary side winding (Nb) is grounded (GND) and the other terminal is connected to the anode of a diode (D4); a first resistor (R1), having one terminal thereof connected to the cathode of the diode (D4) and the other terminal thereof being grounded (GND); a second resistor (R2), having one terminal thereof connected to the cathode of the diode (D4) and the other terminal thereof connected to the cathode of a Zener diode (ZD1); a NPN type transistor (Q4), whose base is connected to the anode of the Zener diode (ZD1), whose emitter is grounded (GND), and whose collector is connected to the cathode of a light-emitting device (IC1A); the light-emitting device (IC1A), whose anode is connected to an LLC chip (LLC IC), and which is also connected to a first voltage output terminal (V0) via a third resistor (R3); and an optical receiver (IC1B), whose output terminal is grounded (GND), and whose input terminal is connected to a second voltage output terminal (VCC) and to a PFC chip (PFC IC). The overcurrent protection circuit can carry out overcurrent protection when a power supply circuit outputs a large current.

Inventors:
YANG, Yong (No. 9-2, Tangming Road Gongming Street,Guangming New Distric, Shenzhen Guangdong 2, 518132, CN)
LIU, Fangyun (No. 9-2, Tangming Road Gongming Street,Guangming New Distric, Shenzhen Guangdong 2, 518132, CN)
Application Number:
CN2017/114866
Publication Date:
January 24, 2019
Filing Date:
December 06, 2017
Export Citation:
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Assignee:
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD. (No. 9-2, Tangming Road Gongming Street,Guangming New Distric, Shenzhen Guangdong 2, 518132, CN)
International Classes:
H02H7/125
Foreign References:
CN107332213A2017-11-07
CN202888788U2013-04-17
CN103928909A2014-07-16
CN205231714U2016-05-11
CN202084911U2011-12-21
US5499154A1996-03-12
Attorney, Agent or Firm:
COMIPS INTELLECTUAL PROPERTY OFFICE (Room 15E, Shenkan BuildingShangbu Zhong Road, Futian Distric, Shenzhen Guangdong 8, 518028, CN)
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