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Title: Extension of soft-switching region of dual-active-bridge converter by a tunable resonant tank
Authors: Yaqoob, M 
Loo, KH 
Lai, YM 
Keywords: Dual-active-bridge (DAB) converter
Switch-controlled inductor
Zero-current switching (ZCS)
Zero-voltage switching (ZVS)
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power electronics, 2017, v. 32, no. 12, p. 9093-9104 How to cite?
Journal: IEEE transactions on power electronics 
Abstract: Hard-switching-induced switching loss can contribute significantly to the power loss of an isolated bidirectional dual-active-bridge (DAB) dc-dc converter operating at high frequency. An LC-type series resonant DAB converter based on a switch-controlled-inductor (SCI) is proposed to mitigate the loss arising from hard switching under wide-range variations in output voltage and current. Zero-voltage switching is achieved at the primary side (high voltage), while at the secondary side (low voltage), zero-current switching is preferred to reduce excessive ringing due to circulating current and switching loss. In order to achieve reduced conduction loss, a nominal operating point is chosen where the root-mean-square resonant tank current is the minimum. To validate the proposed topology and modulation scheme, an LC-type series resonant DAB converter based on SCI operating at 100 kHz is designed to interface a 400-V dc bus to a supercapacitor-based energy storage. Simulation and experimental results validate the effectiveness of the proposed topology for charging/discharging a supercapacitor with an output voltage variation of between 10 and 48 V and a maximum rated power of 480 W. A maximum efficiency of 94.6% is achieved using the proposed topology and modulation scheme.
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2017.2654505
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