| The application field and present status, development trend of DC/AC inverter technology are firstly presented in the thesis.Then novel circuit structure of bi-directional voltage mode (based on Forward converter) inverters with high frequency link, are proposed, which is constituted of input cycloconverter, high frequency transformer, output cycloconverter, input and output filter; The circuit topologies family of this bi-directional voltage mode inverters with high frequency link include six circuit topologies, such as push pull-full wave mode, push pull-full bridge mode, half bridge-full wave mode, half bridge-full bridge mode, full bridge-full wave mode, and full bridge-full bridge mode etc.Taking full bridge-full bridge mode circuit as an example, principle of uni-polarity phase shifting controlled bi-directional voltage mode inverters with high frequency link is introduced. The twelve kinds of modes and equivalent circuits of this inverter with high frequency link within one high frequency switching period are carefully analyzed; By using the state-space averaging approach, the inverter's averaging model is presented, and the design criterion of key circuit parameters and the output characteristic curve are given; The analyses of the system stabilization and the mathematic analyzes of the principle of High-frequency-link of this inverter have also be done.Prototypes for 1kVA 270V±10%DC/115V400HzAC uni-polarity phase shifting controlled bi-directional voltage mode inverter with high frequency link is designed. Its test results indicate: voltage mode inverters with high frequency link have the advantages such as high frequency electrical isolation, simple topology, two-stage power conversions, high power density, bidirectional power flow, good line current waveform, low audio noise, high converting efficiency, and high input power factor etc. This kind of converter lay the key technical foundation on new type high power density, high efficiency and low cost ASI. |
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