基于三重移相的双向全桥DC-DC功率特性分析

摘要

为了提高双向全桥DC-DC变换器的效率,在现有的双重移相控制方式的基础上,一种三重移相控制方式被提出.主要分析三重移相控制方式的工作原理,以及该控制方式下的双向全桥DC-DC变换器工作模式,通过数学建模,推导相关的数学表达式,并分析了相关的变换器功率特性.同时,将三重移相控制方式与双重移相控制方式进行了对比.三重移相控制不仅保留了双重移相控制的优点,而且在实现降低变换器的电流峰值、电流有效值和无功功率,以及提高系统效率等方面具有更明显的优势.最后通过仿真验证了三重移相控制的优越性.%To improve the efficiency of bidirectional full-bridge DC-DC converter,a triple-phase-shift (TPS) control concept is presented base on current dual-phase-shift (DPS) control methodology.This paper analyzes the working principles of the TPS control and the related operating mode of bidirectional full-bridge DC-DC converter.The corresponding mathematical model of the converter is established and the related power characteristics are analyzed.Moreover,the related formulas of the converter under TPS are derived for the convenience of comparative analysis between the TPS control mode and the DPS control mode.The triple-phase-shift control not only retains the advantages of the dual-phase-shift control,but also holds obvious advantages including lower peak current and RMS current,low reactive power,and high efficiency.Finally,a simulation is carried out to verify the excellent performance of the triple-phase-shift control.