提出了基于反激Flyback变换器的电流源高频交流环节AC/AC变换器电路结构与拓扑族。该电路结构由输入周波变换器、高频储能式变压器、输出周波变换器以及输入、输出周波变换嚣构成，能够将一种不稳定畸变的交流电变换成同频率稳定的正弦交流电压；该电路拓扑族包括单四象限功率开关式、推挽式、半桥式、全桥式等四种电路。以单四象限功率开关式电路拓扑为例，分析研究了这类变换器工作模式、稳态原理与电压瞬时值反馈控制策略，给出了变换器的外特性曲线、关键电路参数设计准则。原理试验结果证实了这类变换器新概念的正确性与先进性。

A circuit configuration and circuit topological family of voltage mode ac–ac converters with high frequency ac links, which are based on forward converters, and a uni-polarity phase-shifted control strategy are proposed and deeply investigated. These kinds of converters consist of a input cycloconveter, a high frequency transformer, an output cycloconverter, input and output filters, and can transfer an unsteady ac voltage with a high harmonic into steady same-frequency ac sinusoidal voltage with a low harmonic. By using uni-polarity phase-shifted control strategy, output filtering inductance current is naturally commutated, and zero voltage switching of the output cycloconverter is 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 1kVA220V±10%50 Hz ac/110V50Hz ac prototype have shown that the converters have such advantages as high frequency electrical isolation, simple topology, two-stage power conversion (LFAC/HFAC/LFAC), bidirectional power flow, uni-polarity synchronized pulsewidth modulation waveform, high efficiency, high power density, high steady precision, low total harmonic distortion of the output voltage, strong adaptability to various loads, high line power factor, and low audio noise etc.

首次提出并深入分析研究了一类全数字化技术、与电网电压，n倍频或，n分频信号同步的基准正弦电路，并给出了关键电路参数设计准则与试验结果，试验结果与理论分析一致。该基准正弦电路具有输出正弦电压与电网电压，n频或n分频信号同步、THD小、幅值可调且不受电网电压波动的影响、简单实用、价格低廉等优点，在高频交流环节AC/AC变频变换系统和UPS中具有重要应用价值。

提出了以双管反激变换器为基础的全桥式高频交流环节AC/AC变换器拓扑。该拓扑由输入周波变换器、高频储能式变压器、输出周波变换器以及输入、输出滤波器构成，能够将不稳定劣质的交流电变换成同频率稳定的优质正弦交流电压。分析研究了这种变换器的工作模式、稳态原理特性与电压瞬时值反馈控制策略，给出了变换器的外特性曲线以及变换器内阻对外特性的影响、关键电路参数设计准则。理论分析与原理试验表明，这种变换器具有高频电气隔离、电路拓扑简洁、两级功率变换( LFAC/HFAC/LFAC)、双向功率流、网侧功率因数较高、负载适应能力强、音频噪音小、负载短路时可靠性高、适合于高压输入小功率变换场合等特点。

有源箝位正激式高频脉冲直流环节逆变器具有优良的综合性能。然而，当输入电源电压或负载大信号瞬变时，有源箝位电路的动态特性严重影响了变压器最大磁化电流和功率开关承受的最大峰值电压。本文采用平均状态轨迹法深入分析了闭环反馈控制、输入电压前馈控制有源箝位正激式高频脉冲直流环节逆变器瞬态大信号特性，获得了瞬态大信号特性与系统控制带宽、箝位支路谐振频率参数间的关系。