US 12,451,813 B2
Method for switching between forward operation and reverse operation of isolated bidirectional DC-DC circuit, controller, bidirectional converter, and charging system
Daidong Pan, Hefei (CN); and Wei Liu, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed on Aug. 16, 2023, as Appl. No. 18/450,530.
Claims priority of application No. 202211742647.2 (CN), filed on Dec. 30, 2022.
Prior Publication US 2024/0223096 A1, Jul. 4, 2024
Int. Cl. H02M 3/335 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33584 (2013.01) [H02M 3/01 (2021.05); H02J 2207/20 (2020.01)] 11 Claims
OG exemplary drawing
 
1. A method for switching between a forward operation and a reverse operation of an isolated bidirectional direct current-direct current (DC-DC) circuit, wherein the isolated bidirectional DC-DC circuit comprises a first bridge arm circuit, a second bridge arm circuit, and a transformer arranged between the first bridge arm circuit and the second bridge arm circuit, wherein the method comprises:
on reception of a switching signal, controlling the second bridge arm circuit to stop performing synchronous rectification, and gradually adjusting phases of driving signals outputted to two bridge arm branches in the first bridge arm circuit to adjust an output current of the second bridge arm circuit;
in a case that the output current of the second bridge arm circuit reaches a first predetermined current, controlling the first bridge arm circuit to stop operating, and gradually adjusting phases of driving signals outputted to two bridge arm branches in the second bridge arm circuit; and
in a case that the output current of the second bridge arm circuit reaches a second predetermined current, controlling the first bridge arm circuit to resume operating and perform synchronous rectification.