ISOLATED BI-DIRECTIONAL DC CONVERSION CIRCUIT AND METHOD FOR CONTROLLING THE SAME

• Main Authors: QIAN, Lewei, WAN, Cheng, PENG, Dengming, YI, Jianlei, ZHAO, Pengtao, QIAO, Haibo, CHEN, Fei
• Format: Patent
• Language: English; French; German
• Published: 10.07.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

An isolated bi-directional DC conversion circuit and a method for controlling the same are provided. The isolated bi-directional DC conversion circuit comprises a transformer with at least one first energy storage element and a primary-side rectification bridge coupled to the primary side of the transformer and at least one second energy storage element and a secondary-side rectification bridge coupled to the secondary side of the transformer, the primary-side rectification bridge consisting of multiple first power switching devices, the secondary-side rectification bridge consisting of multiple second power switching devices, and each of the multiple first power switching devices and the second power switching devices having a body diode in inverse parallel connection therewith. The isolated bi-directional DC conversion circuit further comprises: multiple first sampling resistors respectively provided on each bridge arm of an upper bridge arm or a lower bridge arm of the secondary-side rectification bridge; and a controller configured to, in a first mode for power conversion from the primary side to the secondary side, perform switch control on the multiple second power switching devices based on a sampled voltage of the multiple first sampling resistors.