首次提出了电压源高频交流环节AC/AC变换器电路拓扑族，这类电路拓扑由输入周波变换器、高频变压器、输出周波变换器构成。分析研究了这类变换器稳态原理与移相控制策略，绘出了变换器的外特性曲线。这类变换器具有电路拓扑简洁、两级功率变换(LFAC/HFAC/LFAC)、双向功率流、高频电气隔离、网侧电流波形可得到改善、负载适应能力强等优点。PSPICE仿真波形充分证实了这类变换器的正确性和先进性。

A novel combined soft switching technique and a novel circuit topologies family of the static inverter with high frequency pulse dc link are proposed in this paper. The topology structure is constituted of isolated high frequency pulse DC link circuit and DC/AC inverter. In order to overcome the duty cycle D of the one transistor forward mode Static Inverter less than 0.5 and the circuit topology of the interleaved forward mode Static Inverter more complicated, the duty cycle extension of high frequency pulse DC voltage is proposed in this paper. The steady operation principle of the active clamp forward mode high frequency pulse dc link static inverter with duty cycle extension and the control strategy of three-state discrete pulse modulation hysteresis current are deeply investigated. The design criteria for the key circuit parameters are gained. By using combined soft switching technique and the duty cycle extension of high frequency pulse DC voltage, a designed and developed 750VA 27VDC/115V400HzAC prototype has the advantages such as high efficiency, high power density, high reliability, high steady precision, fast dynamical response, strong ability of over-load and short-circuit, and low THD of output voltage.

提出了一类新颖的不间断高功率因数交流开关电源电路结构与拓扑族。这类交流开关电源，由单级不间断高功率因数AC-DC变换器与DC-AC逆变桥级联而成，前级采用电压型PWM控制技术，后级采用三态DPM电流滞环控制技术。分析研究了这类交流开关电源的三种工作模式和稳态原理。试验结果表明，这类交流开关电源具有拓扑简洁、功率密度高、不间断供电、功率因数高、动态响应快、过载和短路能力强、输出波形THD小等优点。

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.

A novel circuit topologies family of the current mode AC/AC converter with high frequency ac link, based on Flyback converter, are proposed. These circuit topologies which can transfer one unregulated sinusoidal voltage with high THD into another regulated constant frequency sinusoidal voltage with low THD, are constituted of input cycloconverter, high frequency storage transformer and output cycloconverter. The circuit topologies family include single four-quadrant power switch mode, push-pull mode, half-bridge mode,and fullbridge mode circuit. The single four-quadrant power switch mode and push-pull mode converter are suit for low input voltage fields, but the half-bridge mode and fullbridge mode converter are suit for high input voltage fields. The operational mode, steady principle and transient voltage feedback control strategy of the kind of converter are investigated. The output characteristic curve, its relation to internal resistance, and the design criterions for the key circuit parameters are given. The current mode AC/AC converters with high frequency ac link have the advantages such as simple topology, two-stage power conversions, bi-directional power flow, high frequency electrical isolation, good line current waveform, strong load adapting ability. The correction and advance of the converters are verified by the Pspice simulation and test results.

提出了基于占空比扩展有源钳位正激式高频脉冲直流环节逆变器的并联逆变器电路结构，并对其电路拓扑、稳态原理、三态DPM电流滞环控制技术、均流原理、关键电路参数设计进行了深入的分析研究。这类并联逆变器，由N个共用电压外环、独立电流内环的占空比扩展有源钳位正激式高频脉冲直流环节逆变器模块构成。设计并研制成功的3kVA 27VDC/115V400HzAC并联逆变器样机，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、并联均流效果好、负载适应能力强、过载与短路能力强等优良的性能，在大功率逆变场合有重要应用价值。

提出了一类双极性移相控制电压源高频交流环节AC/AC变换器，以半桥全波式电路拓扑为例，深入研究了这类变换器的稳态工作原理，获得了变换器功率器件实现软开关的设计准则。借助输出周波变换器换流重叠、输入电网电压极性选择和输出滤波电感电流极性选择，实现了变压器漏感能量和输出滤波电感电流的自然换流，解决了周波变换器固有的电压过冲和环流问题，实现了输入周波变换器功率器件的ZVS开关和输出周波变换器功率器件的ZCS开关，为获得新型正弦交流稳压器和电子变压器奠定了关键技术基础。仿真与原理试验结果均证实了这类变换器的正确性与先进性。

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。

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 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.