OVERCURRENT PROTECTION CIRCUIT

WIPO Patent Application WO/2019/015224

A1

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.

JP2015046962

OPEN-PHASE DETECTION DEVICE OF THREE-PHASE AC POWER SUPPLY

YANG YONG (CN)
LIU FANGYUN (CN)

PCT/CN2017/114866

January 24, 2019

December 06, 2017

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SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECH CO LTD (CN)

H02H7/125

CN107332213A	2017-11-07
CN202888788U	2013-04-17
CN103928909A	2014-07-16
CN205231714U	2016-05-11
CN202084911U	2011-12-21
US5499154A	1996-03-12

COMIPS INTELLECTUAL PROPERTY OFFICE (CN)

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