H5-bridge based single-input-dual-output LLC converter with wide output voltage range

Speaker:    Mr.Liang Wang, ShanghaiTech University

Time:         14:00-15:00, Sept.30. 2021 

Location:   SIST 1C 101

Host:          Prof. Haoyu Wang

Abstract:

A novel single-input-dual-output (SIDO) LLC converter is proposed for wide output voltage applications. An H5-bridge is utilized on the primary side and linked with two separate resonant tanks. By morphing the H5 bridge, the input of each resonant tank can be configured as either full-bridge, half-bridge, or idle. On the secondary side, two semi-active rectifiers provide two control degrees-of-freedoms. The circuit operation is always tuned at the optimal resonant frequency and the output voltages are modulated by the secondary side pulsewidth. It exhibits good voltage regulation performance with two fully decoupled output ports. Both output ports can achieve wide voltage ranges. All MOSFETs can achieve ZVS turning-ON and all the diodes can achieve ZCS turning- OFF over a wide output voltage and load ranges. To verify this concept, a 1.6-kW rated prototype is designed to convert 390 V input into two decoupled 100 - 400 V outputs. The designed prototype exhibits 97.72% peak efficiency and good decoupled voltage regulation performances. The experimental results agree well with the theoretical analysis.

Bio:

Liang Wang (S’19) received the B.S. degree in Electrical Engineering and Automation from Harbin Engineering University, Harbin, China, in 2019. He is currently working toward the Ph.D. degree in the School of Information Science and Technology, ShanghaiTech University, Shanghai, China. His research includes renewable energy systems, multi-port converters.