Light-load conversion efficiency improvement strategy for Phase-Shift Full-Bridge Converters

• Published in: 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia) pp. 488 - 493
• Main Authors: Bin-Han Liu, Jen-Hao Teng, Meng-Yi Lin, Chung-Che Huang
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2017
• Subjects: Capacitance; Conversion Efficiency; Dead-Time Adjustment Strategy; Light-Load; MOSFET; Phase-Shift Full-Bridge Converter; Switches; Switching loss; Zero voltage switching
• DOI: 10.1109/IFEEC.2017.7992087

The traditional Phase-Shift Full-Bridge Converter (PSFBC) cannot achieve Zero-Voltage Switching (ZVS) at light loads due to small resonant current resulting in low conversion efficiency at light loads. Therefore, a light-load conversion efficiency improvement strategy for PSFBC is emerging and needs to be realized. A novel dead-time adjustment strategy for light-load conversion efficiency improvement of PSFBC is proposed in this paper. By the proposed dead-time adjustment strategy, the light-load conversion efficiency of PSFBC can be improved without adding extra electronic components. A PSFBC with an input voltage of 380V, an output voltage of 48V, and a rated power of 480W is designed and implemented in this paper. Experimental results show that the light-load conversion efficiency improvements, 5.75% and 3.64% at output current about 0.6A, comparing with the PSFBC without the dead-time adjustment and the conventional dead-time adjustment, respectively, can be achieved by the proposed dead-time adjustment strategy.