TY - JOUR
T1 - A Bidirectional Resonant DC-DC Converter Suitable for Wide Voltage Gain Range
AU - Shen, Yanfeng
AU - Wang, Huai
AU - Al-Durra, Ahmed
AU - Qin, Zian
AU - Blaabjerg, Frede
PY - 2018/4
Y1 - 2018/4
N2 - This paper proposes a new bidirectional LLC resonant dc-dc converter suitable for wide voltage gain range applications (e.g., energy storage systems). The proposed converter overcomes the narrow voltage gain range of conventional resonant dc-dc converters, and meanwhile achieves high efficiency throughout the wide range of operation voltage. It is achieved by configuring a full-bridge mode and a half-bridge mode operation during each switching cycle. A fixed-frequency phase-shift control scheme is proposed and the normalized voltage gain can be always from 0.5 to 1, regardless of the load. The transformer root-mean-square (rms) currents in both the forward and reverse power flow directions have a small variation with respect to the voltage gain, which is beneficial to the conduction losses reduction throughout a wide voltage range. Moreover, the power devices are soft-switched for minimum switching losses. The operation principles and characteristics of the proposed converter are firstly analyzed in this paper. Then the analytical solutions for the voltage gain, soft-switching, and rms currents are derived, which facilitates the parameters design and optimization. Finally, the proposed topology and analysis are verified with experimental results obtained from a 1-kW converter prototype.
AB - This paper proposes a new bidirectional LLC resonant dc-dc converter suitable for wide voltage gain range applications (e.g., energy storage systems). The proposed converter overcomes the narrow voltage gain range of conventional resonant dc-dc converters, and meanwhile achieves high efficiency throughout the wide range of operation voltage. It is achieved by configuring a full-bridge mode and a half-bridge mode operation during each switching cycle. A fixed-frequency phase-shift control scheme is proposed and the normalized voltage gain can be always from 0.5 to 1, regardless of the load. The transformer root-mean-square (rms) currents in both the forward and reverse power flow directions have a small variation with respect to the voltage gain, which is beneficial to the conduction losses reduction throughout a wide voltage range. Moreover, the power devices are soft-switched for minimum switching losses. The operation principles and characteristics of the proposed converter are firstly analyzed in this paper. Then the analytical solutions for the voltage gain, soft-switching, and rms currents are derived, which facilitates the parameters design and optimization. Finally, the proposed topology and analysis are verified with experimental results obtained from a 1-kW converter prototype.
KW - Isolated bidirectional dc-dc converter
KW - LLC resonant converter
KW - wide voltage gain
KW - Bidirectional DC-DC converter
KW - resonant converter
UR - http://www.scopus.com/inward/record.url?scp=85040773216&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2017.2710162
DO - 10.1109/TPEL.2017.2710162
M3 - Journal article
SN - 0885-8993
VL - 33
SP - 2957
EP - 2975
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 4
M1 - 7936543
ER -