| Based on the discussion to the actuality and development of the high-frequency linkinverter technology，the circuit topology of the single switch Flyback type DC-DCchopper mode inverter with high frequency link is firstly proposed in this paper. Thiskind of circuit topology is differential combination of two bidirectional single switchFlyback DC-DC choppers with capacitor filter paralleled to the output of choppers andload, and LC filter connected to the DC supply and input of choppers. The output currentis filtered by the filter, and a sine voltage on the load is obtained.Circuit topologies, instantaneous output voltage control strategy, the characteristicof steady principle, working mode with different types of load, and design criteria for thekey circuit parameters are investigated in this paper. The output characteristic curve anddesign criteria for the key parameters of circuit such as variation rule of duty ratio of thechoppers, current of storage transformer windings, voltage and current pressure ofswitches etc. are given.The analysis and simulation results of48VDC/220V50HzAC single switch Flybacktype DC-DC chopper mode inverter with high frequency link have shown that theinverter has the advantages such as simple topology, high frequency electric-isolatebetween input and output, single-stage conversion, bi-directional power flow and simplecontrol scheme etc. The inverter theoretical analysis correction and single-stage inverterfeasibility are fully verified by the prototype test. This kind of inverter is suitable for theapplication on low capacity conversion. |
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