两段相控谐振电压变换器分析

Anatolii Lupenko, L. Movchan, Ivan Sysak, Serhii Babiuk
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引用次数: 0

摘要

本文对带相位功率控制的两段谐振dc - dc变换器进行了分析。两段变换器被认为是多段变换器的一种边界情况,只有一个受控段和其他非受控段。转换器部分是并联谐振半桥电压逆变器,通过匹配变压器、中心抽头整流器和平滑滤波器连接到负载上的公共谐振电容。其中一个部分是基准,另一个部分的输出脉冲的相移相对于基准进行调整。变换器的开关频率恒定,提高了变换器的电磁兼容性。采用基谐近似法进行分析。建立了两段变换器电压相和电流相量的解析表达式。得到了变换器功率与半桥逆变器各部分脉冲间相移的关系。分析了变换器的效率与功率的关系。结果表明,在较宽的功率范围内,当功率降低时,效率略有下降,只有在功率低于满载功率的10%时,效率才急剧下降。研究了节型晶体管开关在零电压开关状态下的工作问题。利用电力电子器件建模PSIM程序对变换器电路进行了仿真,验证了所进行的分析。仿真结果与分析结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of two-section phase-controlled resonant voltage converter
Analysis of two-section resonant DC-to-DC converter with phase power control is carried out in this paper. Two-section converter is considered as a boundary case of the multi-section converter with only one controlled section and other uncontrolled sections. The converter sections are parallel resonant half-bridge voltage inverters with a common resonant capacitor connected to the load through a matching transformer, center-tapped rectifier and smoothing filter. One of the sections is the reference, relative to which the phase shift of the output pulses of the other section is adjusted. The switching frequency of the converter is constant, which improves its electromagnetic compatibility. Analysis is carried out by the fundamental harmonic approximation method. Analytical expressions for voltage and current phasors in both sections of the converters have been established. The dependence of the converter power on the phase shift between the pulses of the half-bridge inverter sections was obtained. The dependence of the efficiency of the converter on the power was analyzed. It is shown that the efficiency slightly decreases when the power is reduced in a wide range of powers and only at powers less than 10% of full load power it drops sharply. The problems of operation of section transistor switches in their zero-voltage switching mode is considered. Verification of the conducted analysis was carried out by simulation of the converter circuit using the PSIM program for modeling power electronics devices. The simulation results are in a good agreement with the analysis results.
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