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JPE, Vol. 18, No. 1, January 2018
Single Pulse-Width-Modulation Strategy for Dual-Active Bridge Converters
Byeng-Joo Byen, Byong-Hwan Jeong, and Gyu-Ha Choe
Area Analysis, Modeling and Control
Abstract This paper describes a single pulse-width modulation control strategy using the Single Pulse-Width Modulation (SPWM) method with a soft-switching technique for a wide range of output voltages from a bidirectional Dual-Active Bridge (DAB) converter. This method selects two typical inductor current waveforms for soft-switching, and proposes a rule that makes it possible to achieve soft-switching without any compensation algorithm from the waveforms. In addition, both the step-up and step-down conditions are analyzed. This paper verifies that the leakage inductance is independent from the rule, which makes it easier to apply in DAB converters. An integrated algorithm, which includes step-up and step-down techniques, is proposed. The results of experiments conducted on a 50-kW prototype are presented. The system efficiency is experimentally verified to be from 85.6% to 97.5% over the entire range.
Keyword DC-DC converters,Dual-active bridge converter,Pulse-width modulation,Soft-switching
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