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급속충전기용 파워 모듈을 위한 단일단 AC-DC 컨버터 레덧탕1 , 최세완✝
A Single-Stage AC-DC Power Module Converter for Fast-Charger
Tat-Thang LE and Sewan Choi
The Transactions of the Korean Institute of Power Electronics, Vol. 27, No. 5, October 2022
Abstract
In this study, a single-stage, four-phase, interleaved, totem-pole AC-DC converter is proposed for a
super-fast charger station that requires high power, a wide voltage range, and bidirectional operation
capabilities and adopts various types of electric transport vehicles. The proposed topology is based on
current-fed push-pull dual active bridge converter combined with the totem-pole operation. Owing to the
four-phase interleaving effect, the bridge on the grid side can switch at 0.25, 0.5, and 0.75 to achieve a
ripple-free grid current. The input filter can be removed theoretically. Switching methods for the duty of the
secondary-side duty cycle are proposed, and they correspond to the primary duty cycle for reducing the
circulating power and handling the total harmonic distortion. Therefore, the converter can operate under a wide
voltage range. Experimental results from a 7.5 kW prototype are used to validate the proposed concept.
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