TY - JOUR
T1 - Multiple-Phase-Shift Control for a Dual Active Bridge to Secure Zero-Voltage Switching and Enhance Light-Load Performance
AU - Taylor, Allan
AU - Liu, Guanliang
AU - Bai, Hua
AU - Brown, Alan
AU - Johnson, Philip Mike
AU - McAmmond, Matt
PY - 2018/6/1
Y1 - 2018/6/1
N2 - An ac/dc + dual active bridge (DAB) circuit was found as one solution for the high-efficiency and high-power-density electric vehicle charger. One control option is to let the ac/dc part only convert the grid voltage to a double-line-frequency folded sine wave and let the DAB stage handle both the power factor (PF) and power delivery. While conventional single-phase-shift tends to lose zero-voltage switching (ZVS) at light load and the variable-switching-frequency dual-phase-shift (DPS) sacrifices the light-load performance, this letter proposes a multiple-phase-shift control, which allows for a fixed-switching-frequency triple-phase-shift (TPS) control at the light load to enhance the grid power quality. At medium- and heavy-load conditions, a phase-shift jump from TPS to DPS is performed to reduce the circulating current and improve efficiency. The proposed control strategy secures ZVS, realizes unity PF accurately and minimizes the control complexity. Experimental results on a SiC-based 7.2-kW charger validated its effectiveness and the smooth transition between the heavy load and light load.
AB - An ac/dc + dual active bridge (DAB) circuit was found as one solution for the high-efficiency and high-power-density electric vehicle charger. One control option is to let the ac/dc part only convert the grid voltage to a double-line-frequency folded sine wave and let the DAB stage handle both the power factor (PF) and power delivery. While conventional single-phase-shift tends to lose zero-voltage switching (ZVS) at light load and the variable-switching-frequency dual-phase-shift (DPS) sacrifices the light-load performance, this letter proposes a multiple-phase-shift control, which allows for a fixed-switching-frequency triple-phase-shift (TPS) control at the light load to enhance the grid power quality. At medium- and heavy-load conditions, a phase-shift jump from TPS to DPS is performed to reduce the circulating current and improve efficiency. The proposed control strategy secures ZVS, realizes unity PF accurately and minimizes the control complexity. Experimental results on a SiC-based 7.2-kW charger validated its effectiveness and the smooth transition between the heavy load and light load.
KW - Battery charger
KW - Dual active bridges (DABs)
KW - Phase-shift control
KW - Wide-bandgap (WBG) devices
KW - Zero-voltage switching (ZVS)
UR - https://digitalcommons.kettering.edu/electricalcomp_eng_facultypubs/1
UR - https://doi.org/10.1109/TPEL.2017.2769638
U2 - 10.1109/TPEL.2017.2769638
DO - 10.1109/TPEL.2017.2769638
M3 - Article
VL - 33
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
ER -