SWITCHING POWER SOURCE, DCM-BASED SELF-POWERED CIRCUIT, AND CCM-BASED SELF-POWERED CIRCUIT

WIPO Patent Application WO/2024/087637

A1

The present application belongs to the technical field of switching power source control, and relates to a switching power source, a DCM-based self-powered circuit and a power supplementing method, and a CCM-based self-powered circuit and a power supplementing method. The CCM-based self-powered circuit is applied to a flyback switching power source, and comprises a voltage-withstanding switch tube, a charging branch and a charging control unit, wherein the voltage-withstanding switch tube is connected in series between a primary-side coil and the charging branch, and is used for acquiring a power supply voltage of the primary-side coil and outputting a charging voltage for charging the charging branch; the charging branch comprises a charging capacitor, which is used for supplying power to a switching power source chip, and a charging switch tube, which is used for controlling whether the charging capacitor charges, the charging switch tube being connected between the charging capacitor and the voltage-withstanding switch tube; and the charging control unit is used for controlling whether the charging branch is turned on. The present application has the effect of improving the stability of a working voltage of a switching power source.

ZHANG JIE (CN)
ZHU MIN (CN)
QIU CHENGYU (CN)
ZHENG LINGBO (CN)

PCT/CN2023/098419

May 02, 2024

June 05, 2023

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LII SEMICONDUCTOR CO LTD (CN)

H02M3/335; H02M1/00; H02M1/08; H02M1/32

CN115395795A	2022-11-25
CN115498891A	2022-12-20
CN106059279A	2016-10-26
CN101667792A	2010-03-10
CN103023298A	2013-04-03
CN107612107A	2018-01-19
US20160344294A1	2016-11-24

BEIJING WEIZHENG PATENT AGENCY CO., LTD. (CN)

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