US 11,870,342 B2
Resonant converter and operating method thereof
Hui Huang, Shanghai (CN); Kun-Peng Wang, Shanghai (CN); Shuai-Lin Du, Shanghai (CN); Wei-Ke Yao, Shanghai (CN); Feng Yao, Shanghai (CN); Kai Dong, Shanghai (CN); and Jin-Fa Zhang, Shanghai (CN)
Assigned to Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Nov. 30, 2021, as Appl. No. 17/456,888.
Claims priority of application No. 202111048497.0 (CN), filed on Sep. 8, 2021.
Prior Publication US 2023/0076528 A1, Mar. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/00 (2006.01); H02M 1/00 (2006.01); H02M 3/335 (2006.01)
CPC H02M 3/01 (2021.05) [H02M 1/0096 (2021.05); H02M 1/0058 (2021.05); H02M 3/33576 (2013.01)] 31 Claims
OG exemplary drawing
 
21. A method of operating a resonant converter, the resonant converter including a primary circuit, a resonant network coupled to the primary circuit, a transformer having a primary winding coupled to the resonant network and a secondary winding, a secondary circuit coupled to the secondary winding, and a control circuit coupled to the primary circuit and the secondary circuit, wherein the primary circuit includes a plurality of primary switches, and the secondary circuit includes a plurality of secondary switches, the method comprising:
controlling the plurality of primary switches operating with a switching frequency, wherein at least one of the plurality of primary switches is configured to be turned on from a first switching moment until a second switching moment; and
controlling at least one of the plurality of secondary switches to be turned on during a first time interval, such that the secondary winding being clamped by a preset voltage, a current of the resonant network is increased in a first flowing direction, and an output current is increased in a second flowing direction or equal to zero, wherein the first time interval is between the first switching moment and the second switching moment,
wherein the first time interval is determined by a third switching moment and the second switching moment,
the at least one of the plurality of primary switches is turned on from the third switching moment until the second switching moment and is turned off at the second switching moment, and
the at least one of the plurality of secondary switches is turned on from the third switching moment until the second switching moment.