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A Study on the Analysis of Internal Power Loss Including Leakage Inductance of Power Transformer for DAB Converter  

Yoo, Jeong Sang (Department of Electronic Engineering, Cheongju University)
Ahn, Tae Young (Department of Electronic Engineering, Cheongju University)
Gil, Yong Man (Department of Electronic Engineering, Cheongju University)
Publication Information
Journal of the Semiconductor & Display Technology / v.21, no.2, 2022 , pp. 95-100 More about this Journal
Abstract
In this paper, a power loss analysis technique of a high-frequency transformer of a bidirectional DAB (Dual Active Bridge) converter is reported. To miniaturize the transformer of the dual active bridge converter, a resonant inductor was designed with an air gap included low-coupled rate state core to combine leakage inductor with the resonant inductor which is required for soft-switching. In this paper, leakage inductance and magnetizing inductance, core material, type of winding and winding method are included in the dual active bridge transformer loss analysis process to enable optimal design at the initial design stage. Transformer loss analysis for dual active bridge with a switching frequency of 200 kHz and maximum output of 5 kW was executed, and elements necessary for design based on the number of turns on the primary side were graphed while maintaining the transformer turns ratio and window area. In particular, it was possible to determine the optimal number of turns and thickness of the transformer, and ultimately, the total loss of the transformer could be estimated.
Keywords
DAB converter; Power transformer; Dual Active Bridge; Leakage inductance; Loss analysis;
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