LLC RESONANT CONVERTER, AND WIDE GAIN CONTROL METHOD

WIPO Patent Application WO/2022/088744

A1

Disclosed are a wide gain control method for an LLC resonant converter. The method comprises: dividing an input voltage range into two voltage sections, and using two control modes; in a low voltage section of the input voltage range, using a full-bridge LLC PFM control mode, and changing an output voltage gain by means of changing a switch frequency; and in a high voltage section of the input voltage range, using a full-bridge LLC variable duty cycle control mode, wherein in the range of the entire high voltage section, a switch frequency is equal to a resonant frequency fr, and changing an output voltage gain by means of changing a duty ratio of a primary-side switch transistor. Further disclosed is an LLC resonant converter using the control method. By means of the present invention, smooth switching between modes can be realized, the working efficiency, the gain range and the power density of a converter are improved, and the requirement of a wide-voltage gain range conversion occasion is met.

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LI BINHUA (CN)
LI YONGCHANG (CN)

PCT/CN2021/104748

May 05, 2022

July 06, 2021

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MORNSUN GUANGZHOU SCI & TECH (CN)

H02M7/48; H02M3/335

CN112332674A	2021-02-05
CN110601543A	2019-12-20
CN110768535A	2020-02-07
CN110649812A	2020-01-03
CN103595257A	2014-02-19
CN109687720A	2019-04-26
CN108696140A	2018-10-23
CN104578804A	2015-04-29
US9281753B2	2016-03-08

GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)

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