An Improved Extended Phase Shift Modulation for DAB Converter with the Blocking Capacitor

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society Pub Date : 2021-10-13 DOI:10.1109/IECON48115.2021.9589408

Jian Tang, Guo Xu, Liting Li, Jingtao Xu, M. Su

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引用次数: 1

Abstract

Based on extended phase shift (EPS) modulation with voltage matching control and the DC blocking capacitor, an improved modulation method for dual-active-bridge (DAB) DC-DC converters with the blocking capacitor is proposed in this paper, which can realize full load range zero voltage switching (ZVS) under wide voltage range with low root-mean-square (RMS) current. In the proposed scheme, the volt-second products of all windings are kept equal to achieve the full load range ZVS, and the secondary side of the converter is switched between the full bridge mode and the half bridge mode to switch the optimal matching point of the voltage and then reduces RMS current and enlarges the ZVS region. The operation principle of the proposed method is analyzed, and ZVS region is illustrated and compared with conventional modulation to demonstrate the performance. A 1kW experimental prototype with 200V input and 100 - 400V output was built to verify the feasibility and effectiveness of the proposed method.

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带阻塞电容的改进型DAB变换器扩展相移调制

基于电压匹配控制的扩展相移(EPS)调制和直流阻塞电容，提出了一种改进的双有源桥式(DAB) DC-DC变换器的阻塞电容调制方法，该方法可以在宽电压范围和低RMS电流下实现全负载范围零电压开关(ZVS)。在该方案中，各绕组的电压-秒乘积保持相等，达到满负载范围ZVS，变换器二次侧在全桥模式和半桥模式之间切换，以切换电压的最佳匹配点，从而减小RMS电流，扩大ZVS区域。分析了该方法的工作原理，给出了ZVS区域图，并与传统调制方法进行了比较。搭建了一台输入200V、输出100 ~ 400V、功率1kW的实验样机，验证了该方法的可行性和有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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