Title:
WIDE GAIN CONTROL METHOD FOR VARIABLE TOPOLOGY LLC RESONANT CONVERTER
Document Type and Number:
WIPO Patent Application WO/2021/077757
Kind Code:
A1
Abstract:
Disclosed is a wide gain control method for a variable topology LLC resonant converter, the method being applied to a variable topology LLC resonant converter composed of an inverter circuit, an LLC resonant cavity, a transformer and a secondary rectifying and filtering output circuit. In the present invention, the range of an input voltage is divided into a low voltage section, a medium voltage section and a high voltage section respectively corresponding to three different modals; the variable topology LLC resonant converter uses variable-frequency PFM control of an FBLLC structure in the low voltage section of the input voltage, and an output voltage gain is changed by means of changing a switch frequency; the variable topology LLC resonant converter uses fixed-frequency PWM control of the FBLLC structure in the medium voltage section of the input voltage, and the output voltage gain is changed by means of changing a duty ratio of a switch tube (S1) of the inverter circuit; and the variable topology LLC resonant converter uses fixed-frequency PWM control of an HBLLC structure in the high voltage section of the input voltage, and the output voltage gain is changed by means of changing the duty ratio of the switch tube (S1) of the inverter circuit.
Inventors:
DU JUAN (CN)
LI SIYUAN (CN)
LI YONGCHANG (CN)
LI SIYUAN (CN)
LI YONGCHANG (CN)
Application Number:
PCT/CN2020/094484
Publication Date:
April 29, 2021
Filing Date:
June 05, 2020
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCI & TECH (CN)
International Classes:
H02M3/335
Foreign References:
| CN110768535A | 2020-02-07 | |||
| CN110649812A | 2020-01-03 | |||
| CN110601543A | 2019-12-20 | |||
| CN110707931A | 2020-01-17 | |||
| CN108696140A | 2018-10-23 | |||
| CN109687720A | 2019-04-26 | |||
| CN108242891A | 2018-07-03 | |||
| CN103595257A | 2014-02-19 | |||
| US20140036545A1 | 2014-02-06 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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