TY - JOUR
T1 - A Modular-Designed Three-Phase High-Efficiency High-Power-Density EV Battery Charger Using Dual/Triple-Phase-Shift Control
AU - Lu, Juncheng
AU - Bai, Kevin
AU - Taylor, Allan Ray
AU - Liu, Guanliang
AU - Brown, Alan
AU - Johnson, Philip Michael
AU - McAmmond, Matt
PY - 2017/11/2
Y1 - 2017/11/2
N2 - In this paper, an enhancement-mode GaN highelectron mobility transistor (HEMT)-based 7.2-kW single-phase charger was built. Connecting three such single-phase modules to the three-phase grid, respectively, generates a three-phase ~22-kW charger with the> 97% efficiency and > 3.3 - kW/L power density, superior to present Si-device-based chargers. In addition to GaN HEMTs with fast-switching transitions yielding high efficiency, the proposed charger employs the dc/dc stage to control the power factor and power delivery simultaneously, yielding little dc-bus capacitance and thereby high power density. To secure the soft switching for all switches within full voltage and power ranges, a variable switching frequency control with dual phase shifts was adopted at high power, and a triple phase shift was employed to improve the power factor at low power. Both control strategies accommodated the wide input range (80-260 VAC) and output range (200-450 VDC). A closed-loop control for the three-phase charger was realized to minimize the output current ripple and balance the power among three single-phase modules. Experimental results validated this design.
AB - In this paper, an enhancement-mode GaN highelectron mobility transistor (HEMT)-based 7.2-kW single-phase charger was built. Connecting three such single-phase modules to the three-phase grid, respectively, generates a three-phase ~22-kW charger with the> 97% efficiency and > 3.3 - kW/L power density, superior to present Si-device-based chargers. In addition to GaN HEMTs with fast-switching transitions yielding high efficiency, the proposed charger employs the dc/dc stage to control the power factor and power delivery simultaneously, yielding little dc-bus capacitance and thereby high power density. To secure the soft switching for all switches within full voltage and power ranges, a variable switching frequency control with dual phase shifts was adopted at high power, and a triple phase shift was employed to improve the power factor at low power. Both control strategies accommodated the wide input range (80-260 VAC) and output range (200-450 VDC). A closed-loop control for the three-phase charger was realized to minimize the output current ripple and balance the power among three single-phase modules. Experimental results validated this design.
KW - Battery charger
KW - Dual- active bridge (DAB)
KW - Electric vehicle (EV)
KW - Wide-bandgap (WBG) semiconductor
KW - Zero-voltage switching (ZVS)
UR - https://digitalcommons.kettering.edu/electricalcomp_eng_facultypubs/3
UR - https://doi.org/10.1109/TPEL.2017.2769661
U2 - 10.1109/TPEL.2017.2769661
DO - 10.1109/TPEL.2017.2769661
M3 - Article
VL - 33
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
ER -