The Uni-polarity Phase-shifted Controlled Buck Mode AC/AC Converters with High Frequency Link
The Uni-polarity Phase-shifted Controlled Buck Mode AC/AC Converters with High Frequency Link
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DOI：
10.1109/pesc.2007.4342033
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发表时间：
2007-06
期刊：
影响因子：
--
通讯作者：
Daolian Chen
中科院分区：
文献类型：
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作者：
Daolian Chen
提出并深入研究了一种高频环节Buck模式AC/AC变换器的电路结构和拓扑族，以及单极性移相控制策略。这种变换器由输入周波变换器、高频Transformer、输出周波变换器、输入滤波器和输出滤波器组成，能将高次谐波的不稳定交流电压变换为低次谐波的同频正弦交流电压。采用单极性移相控制策略，使输出滤波电感电流自然换相，实现了输出周波变换器的零电压开关。给出了变换器的平均模型、输出特性曲线和关键电路参数的设计准则。理论分析和1 kVA 220 Vplusmn10%50 HzAC/110 V50 HzAC样机试验结果表明，该变换器具有高频电气隔离、拓扑结构简单、两级功率变换等优点（LFAC/HFAC/LFAC），双向功率流，单极性SPWM波形，高效率，高功率密度，高稳态精度，输出电压THD低，对各种负载适应性强，线路功率因数高，音频噪声低等特点。
A circuit configuration and circuit topological family of Buck mode AC/AC converters with high frequency link, and uni-polarity phase-shifted control strategy are proposed and deeply investigated. This kind of converters is constituted of input cycloconveter, high frequency transformer, output cycloconverter, input and output filters, and can transfer an unsteady ac voltage with high harmonic into steady same frequency ac sinusoidal voltage with low harmonic. By using uni-polarity phase-shifted control strategy, output filtering inductance current are naturally commutated, and ZVS of the output cycloconverter are realized. The converters' averaging model, the output characteristic curve, and design criteria for the key circuit parameters are given. The theoretical analysis and test result of 1 kVA 220 Vplusmn10%50 HzAC/110 V 50 HzAC prototype have shown that the converters have the advantages such as high frequency electrical isolation, simple topology, two-stage power conversion(LFAC/HFAC/LFAC), bi-directional power flow, uni-polarity SPWM waveform, high efficiency, high power density, high steady precision, low THD of the output voltage, strong adaptability to various loads, high line power factor and low audio noise etc.