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1. (WO2018014386) CONTROL CIRCUIT OF SWITCH POWER SUPPLY

Pub. No.:    WO/2018/014386    International Application No.:    PCT/CN2016/094683
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Fri Aug 12 01:59:59 CEST 2016
IPC: H02M 1/36
Applicants: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO.,LTD.
深圳市华星光电技术有限公司
Inventors: CA0, Dan
曹丹
Title: CONTROL CIRCUIT OF SWITCH POWER SUPPLY
Abstract:
A control circuit of a switch power supply, comprising a soft start voltage generation circuit (10), a first comparator (20), a voltage selection circuit (30), a switch circuit (50), a second comparator (60), an error amplification circuit (40) and a pulse signal control circuit (70). In a soft start phase and a normal working phase, the control circuit selects, by means of the voltage selection circuit (30), different superposition voltages to superpose same with a control voltage, so as to obtain a clamp voltage, so that the control circuit has different clamp voltages in the soft start phase and the normal working phase, and the stability of the whole system is improved. In addition, when a voltage value at an output end of the switch circuit (50) is greater than a voltage value of a reference voltage, the second comparator (60) outputs a first high level signal to a clock signal generator, so as to enable the clock signal generator to stop working, so that the control circuit is in a sleep state, and the efficiency of a switch power supply is improved.