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。

该文提出了一类基于反激变换器的单级不间断高功率因数直流开关电源电路结构与拓扑族。这类直流开关电源电路结构，由二极管整流桥与多功能反激直流变换器构成，实现了不间断供电、功率因数校正、输出直流电压的稳定与调节。深入分析研究了这类变换器的三种工作模式、稳态原理与关键电路参数设计准则。试验结果表明，这类直流开关电源具有拓扑简洁、变换效率高、功率密度高、不间断供电、功率因数高、输出直流电压稳定、成本低等优点，在计算机、通信、医疗等电子设备中具有广泛的应用前景。

A circuit topology family of the voltage mode ACIAC converters with high frequency ac link are proposed. The kind of circuit topologies are constituted of input cycloconverter, high frequency transformer, and output cycloconverter. The bipolarity phase-shifted control strategy and steady principles are deeply investigated. The output characteristics of the converters are given. By using commutation overlap of the output cycloconverter and the polarity selection of the input voltage and the output filtering inductance current, the leakage inductance energy and the output filtering inductance current are naturally commutated, and the surge voltage and the surge current of the cycloconverters are overcome. The converters have the advantages such as simple topology, two-stage power conversions (LFAC/HFAC/LFAC), bi-directional power flow, high frequency electrical isolation, good line current waveform and output voltage waveform, and strong load adapting function. The converters lay key technical foundation on new-type regulated sinusoidal ac power supplies and electronic transformers. The correction and advancement of the converters are well verified by simulation and principle test

A combined three-phase inverter based on the duty cycle extended active clamp forward mode inverter with high frequency pulse dc link is proposed in this paper. The three phase inverter is constituted of three same single inverter modules. The voltage-mode feed forward control strategy is introduced in the active clamp forward mode high frequency pulse DC link circuit, the three-state discrete pulse modulation (DPM) hysteresis current control strategy is introduced in the inverter. The circuit topology, steady principle, control strategy, load characteristic, criteria for the key circuit parameters of the combined three-phase inverter are deeply investigated. A designed and developed 3kVA 27VDC/200V400HzAC prototype has excellent comprehensive performances such as small bulk, lower weight, high conversion efficiency, high steady precision, wide input voltage range, low THD of output voltage, strong over-load and short-circuit ability, and strong ability with different nature load and unbalanced three-phase load.

该文提出了基于占空比扩展有源箝位正激式高频脉冲直流环节逆变器的组合式三相逆变器电路结构，并对其电路拓扑、稳态原理、三态DPM 电流滞环控制技术、负载特性、关键电路参数设计进行了深入的分析研究。这类组合式三相逆变器，由3个完全相同的单相逆变器模块构成。设计并研制成功的3kVA27VDC/200V400HzAC 组合式三相高频脉冲直流环节逆变器，具有体积重量小、变换效率高、静态精度高、动态响应快、输入电压变化范围宽、输出波形质量高、过载与短路能力强、带三相不平衡负载的能力强等综合性能。