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http://dx.doi.org/10.6113/TKPE.2021.26.6.437

Operating Frequency Design for Stable Initial Operation of Loosely Coupled Resonant DAB Converter  

Baek, Seung-Hyuk (Div. of Electrical Engineering, Hanyang University, ERICA Campus)
Kim, Sungmin (Div. of Electrical Engineering, Hanyang University, ERICA Campus)
Lee, Jaehong (School of Electrical and Computer Engineering, University of Seoul)
Lee, Seung-Hwan (School of Electrical and Computer Engineering, University of Seoul)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.26, no.6, 2021 , pp. 437-445 More about this Journal
Abstract
This paper proposes an operating frequency design method that limits the voltage applied to aload-side converter during the initial operation of a loosely coupled resonant dual-active bridge (LCR-DAB) converter and an initial operating strategy that applies it. The LCR-DAB converter uses two wireless power transfer coils instead of the high-frequency transformer of the general DAB converter. The wireless power coil has a physical distance of several tens of millimeter or more between the two coils; thus, the LCR-DAB converter is a bidirectional isolated power conversion system that can easily achieve high insulation performance. However, for the initial operation of the LCR-DAB, if the power-side converter is operated at the resonance frequency while the load-side converter is not operating, then a very high voltage due to resonance is applied to the load-side converter, thereby causing damage to the converter. Therefore, a method that can stably charge the DC link voltage of the secondary-side converter during the initial operation is needed. This paper proposes a method to initially charge the secondary-side DC link by operating the primary-side converter at a frequency with limited voltage gain rather than at a steady-state operating frequency. The validity of the proposed frequency design method and initial operating sequence is verified through simulation and experimentation of the 1 KW LCR-DAB converter.
Keywords
SST (Solid-State Transfome); DAB (Dual-Acive-Bridge) converter; LCR (Looesly coupled resonant) DAB converter; WPT (Wireless Power Transfer); IPT (Inductive Power Transfer);
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