Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

Shu-huai Zhang, Yi-feng Wang, Bo Chen, Fu-qiang Han and Qing-cui Wang
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Shu-huai Zhang: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Yi-feng Wang: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Bo Chen: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Fu-qiang Han: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Qing-cui Wang: Tianjin Research Institute of Electric Science Co., Ltd. (TRIED), Tianjin 300300, China

Energies, 2018, vol. 11, issue 1, 1-22

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.

Keywords: bidirectional CLTC resonant DC-DC converter; light load; synchronous rectification strategy; power loss analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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