TY - GEN
T1 - Study on Improving Line Frequency Ripple of Bidirectional DC-DC CLLC Resonant Converter
AU - Lin, Yu Meng
AU - Liang, Tsorng Juu
AU - Chen, Kai Hui
AU - Liao, Kuo Fu
N1 - Funding Information:
ACKNOWLEDGEMENT This research is supported by the National Science and Technology Council in Taiwan under project number 111-3116-F-006 -006 – and 110-2221-E-006 -123 -MY3.
Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - The output of the traditional battery charging system contains high double line frequency ripple content, which causes thermal cycling and short life cycle of the battery. In this paper, a digital controlled isolated bidirectional resonant converter for battery charging system with low double line frequency ripple in charging stage is implemented. The full-bridge CLLC converter with silicon carbide power devices can achieve soft switching characteristic and higher efficiency. In addition, an adaptive frequency modulation method with the input voltage ripple feed-forward (RFF) control is proposed to reduce the double line frequency ripple. The operating principles of bidirectional resonant converter are analyzed, the steady-state equivalent models and the voltage gain curves are derived, then appropriate frequency variation for output voltage regulation is designed. Also, the resonant tank of CLLC is carefully designed for achieving symmetrical operations as CLLLC in charging and discharging stages. A digital signal processor (DSP) is used to implement laboratory prototype with rated power 1.5 kW, DC bus voltage 390 VDC, and battery voltage 130-170 VDC to verify the feasibility of the proposed method. The maximum conversion efficiency of CLLC converter in the charging stage and discharging stage are 96.7% and 95.6%, respectively. Moreover, the double line frequency ripple voltage can be reduced by 70% with the proposed algorithm.
AB - The output of the traditional battery charging system contains high double line frequency ripple content, which causes thermal cycling and short life cycle of the battery. In this paper, a digital controlled isolated bidirectional resonant converter for battery charging system with low double line frequency ripple in charging stage is implemented. The full-bridge CLLC converter with silicon carbide power devices can achieve soft switching characteristic and higher efficiency. In addition, an adaptive frequency modulation method with the input voltage ripple feed-forward (RFF) control is proposed to reduce the double line frequency ripple. The operating principles of bidirectional resonant converter are analyzed, the steady-state equivalent models and the voltage gain curves are derived, then appropriate frequency variation for output voltage regulation is designed. Also, the resonant tank of CLLC is carefully designed for achieving symmetrical operations as CLLLC in charging and discharging stages. A digital signal processor (DSP) is used to implement laboratory prototype with rated power 1.5 kW, DC bus voltage 390 VDC, and battery voltage 130-170 VDC to verify the feasibility of the proposed method. The maximum conversion efficiency of CLLC converter in the charging stage and discharging stage are 96.7% and 95.6%, respectively. Moreover, the double line frequency ripple voltage can be reduced by 70% with the proposed algorithm.
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U2 - 10.1109/APEC43580.2023.10131410
DO - 10.1109/APEC43580.2023.10131410
M3 - Conference contribution
AN - SCOPUS:85162203267
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 2199
EP - 2206
BT - APEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023
Y2 - 19 March 2023 through 23 March 2023
ER -