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首页> 外文期刊>Journal of power electronics >A High-efficiency Method to Suppress Transformer Core Imbalance in Digitally Controlled Phase-shifted Full-bridge Converter
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A High-efficiency Method to Suppress Transformer Core Imbalance in Digitally Controlled Phase-shifted Full-bridge Converter

机译：一种抑制数控移相全桥变换器中变压器铁心不平衡的高效方法

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摘要

A high-efficiency method is proposed to suppress magnetic core imbalance in phase-shifted full-bridge (PSFB) converters. Compared with conventional solutions, such as controlling peak current mode (PCM) or adding DC blocking capacitance, the proposed method has several advantages, such as lower power loss and smaller size, because the additional current sensor or blocking capacitor is removed. A time domain model of the secondary side is built to analyze the relationship between transformer core imbalance and cathode voltage of secondary side rectifiers. An approximate control algorithm is designed to achieve asymmetric phase control, which reduces the effects of imbalance. A 60 V/15 A prototype is built to verify the proposed method. Experimental results show that the numerical difference of primary side peak currents between two adjacent cycles is suppressed from 2 A to approximately 0 A. Meanwhile, compared with the PCM solution, the efficiency of the PSFB converter is slightly improved from 93% to 93.2%.
机译：提出了一种高效的方法来抑制相移全桥（PSFB）转换器中的磁芯不平衡。与传统的解决方案（例如控制峰值电流模式（PCM）或添加DC阻止电容）相比，该方法具有一些优势，例如功耗更低，尺寸更小，因为省去了额外的电流传感器或阻止电容器。建立了次级侧的时域模型，以分析变压器铁心不平衡与次级侧整流器的阴极电压之间的关系。设计了一种近似控制算法来实现非对称相位控制，从而减少了不平衡的影响。建立了60 V / 15 A原型来验证所提出的方法。实验结果表明，两个相邻周期之间的一次侧峰值电流的数值差从2 A抑制到大约0A。同时，与PCM解决方案相比，PSFB转换器的效率从93％略微提高到93.2％。

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