Abstract
This study presents a new bidirectional multi-resonant DC-DC converter, which is named CLTC. The converter adds an auxiliary transformer and an extra resonant capacitor based on a LLC resonant DC-DC converter, achieving zero-voltage switching (ZVS) for the input inverting switches and zero-current switching (ZCS) for the output rectifiers in all load range. The converter also has a wide gain range in two directions. When the load is light, a half-bridge configuration is adopted instead of a full-bridge configuration to solve the problem of voltage regulation. By this method, the voltage gain becomes monotonous and controllable. Besides, the digital synchronous rectification strategy is proposed in forward mode without adding any auxiliary circuit. The conduction time of synchronous rectifiers equals the estimation value of body diodes’ conduction time with the lightest load. Power loss analysis is also conducted in different situations. Finally, the theoretical analysis is validated by a 5 kW prototype.
Highlights
With advantage of zero-voltage switching (ZVS) + zero-current switching (ZCS), the bidirectional resonant DC-DC converter (BRDC) is gaining more attention in DC distribution system or DC microgrid applications [1,2,3,4,5,6,7,8]
BRDCs are characterized by high efficiency, high power density and low electromagnetic interference (EMI), and are applicable to high frequency applications [9,10]
Section, the power loss distribution is calculated with mathematical models and compared with different the power loss distribution is calculated with mathematical models and compared with different low-voltage side (LVS)
Summary
With advantage of ZVS + ZCS, the bidirectional resonant DC-DC converter (BRDC) is gaining more attention in DC distribution system or DC microgrid applications [1,2,3,4,5,6,7,8]. BRDCs are characterized by high efficiency, high power density and low EMI, and are applicable to high frequency applications [9,10]. Among all the BRDCs, the bidirectional series resonant converter (BSRC) is a candidate topology [11,12,13,14,15,16]. All the switches of a BSRC work in either ZVS or ZCS for a wide variation of voltage gains with phase-shift control [13]. A novel control scheme was developed for BSRC in discontinuous mode [14]
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