TY - GEN
T1 - Investigation of Adaptive Synchronous Rectifier (SR) Driving Scheme for LLC/CLLC Resonant Converter in EV On-Board Chargers
AU - Zhang, Zhengda
AU - Liu, Chunhui
AU - Si, Yunpeng
AU - Liu, Yifu
AU - Lei, Qin
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/3
Y1 - 2020/3
N2 - For LLC/CLLC resonant converters, synchronous rectifiers (SR) are desired to be turned off at the current zerocrossing moment to avoid the additional conduction loss and the circulation current. In this paper, an adaptive SR driving scheme is proposed for LLC/CLLC resonant converter, which guarantees the ZCS turn-off of the SRs and improves the system efficiency. The proposed method senses the drain-to-source voltage of only one switch, which makes it easy to implement. Meanwhile, a simple drain-to-source voltage sensing circuit is proposed. The proposed circuit can be directly interfaced with the digital controller without any signal conditioning circuit. Moreover, external RC circuits are employed to compensate the turnon moment discrepancy between the SR and its corresponding primary side switch. A 6.6 kW/500 kHz CLLC resonant converter prototype is built, which is used as the isolated dc-dc stage for an EV on-board charger. The proposed adaptive driving scheme is validated by experimental tests.
AB - For LLC/CLLC resonant converters, synchronous rectifiers (SR) are desired to be turned off at the current zerocrossing moment to avoid the additional conduction loss and the circulation current. In this paper, an adaptive SR driving scheme is proposed for LLC/CLLC resonant converter, which guarantees the ZCS turn-off of the SRs and improves the system efficiency. The proposed method senses the drain-to-source voltage of only one switch, which makes it easy to implement. Meanwhile, a simple drain-to-source voltage sensing circuit is proposed. The proposed circuit can be directly interfaced with the digital controller without any signal conditioning circuit. Moreover, external RC circuits are employed to compensate the turnon moment discrepancy between the SR and its corresponding primary side switch. A 6.6 kW/500 kHz CLLC resonant converter prototype is built, which is used as the isolated dc-dc stage for an EV on-board charger. The proposed adaptive driving scheme is validated by experimental tests.
KW - EV on-board charger
KW - Synchronous rectification
KW - WBG devices
KW - high frequency
KW - high power density
KW - resonant converter
UR - http://www.scopus.com/inward/record.url?scp=85087770876&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85087770876&partnerID=8YFLogxK
U2 - 10.1109/APEC39645.2020.9124270
DO - 10.1109/APEC39645.2020.9124270
M3 - Conference contribution
AN - SCOPUS:85087770876
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 2185
EP - 2191
BT - APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020
Y2 - 15 March 2020 through 19 March 2020
ER -