Study On AC/AC Converter With 30kHz Sinewave Output

High power density as well as high efficiency has always been the goal to pursue in the field of moden electric power converters, Power Factor Correction(PFC) and soft switch provide an effective way. So, this paper presents a series-parallel resonant inverter with PFC ahead. the paper introduces the principle of PFC rectifier with the average current mode controlled circuit as an example, analysing the producing of third harmonic of input current and restraining it ,at last giving a methord of designing control system. By classifying load resonant inverters and comparing their characteristic ,a topology of series resonant inverter with output from resonant capacity is proposed. The topology integrats the advantage of series resonant inverter and parallel resonant inverter. As it works below the resonant frequency, soft switching will be achieved, and the circuit could reach indiscrimination to reactive load approximately. The paper describes the principle of this circuit , analysising the identity of load and the change of load working on the inverter in detail, summarizing the principle of selecting resonant induction and capacity. The control of the two circuits is unattached, the former adopts PWM and the latter introduces phase-shifted control to adjust output,working simply and safely. Finally, simulation and experiment are carried out, the experimental result indicates that the project is feasible, this scheme could be used in the fields of high frequency inverter.