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Switching inverters have made great achievements in the development direction of high frequency. High-frequency technology directly leads to a significant reduction in the volume and weight of isolation transformers and AC filters; at the same time, high-frequency technology also leads to a rapid increase in switching losses and an increase in electromagnetic interference. The development of high frequency is also largely constrained by the magnitude of inverter conversion power.

The proposal and application of soft switching technology has alleviated the influence of switching loss and electromagnetic interference to a large extent. In particular, PWM soft switching technology not only realizes soft switching, but also takes into account the advantages of pulse width modulation linearization and easy implementation, so it is obtained a wide range of applications. At present, the application of inverter high-frequency technology in small and medium power high-frequency chain multi-stage conversion inverters is quite mature, but the application of various high-frequency chain single-stage conversion inverters and the application of resonant high-frequency chain single-stage conversion inverters It is being promoted, and there are many technical issues that need further exploration and research. Since Professor D.M.Divan of the University of Wisconsin in the United States proposed the DC bus resonant soft switching technology and the bridge arm pole resonant soft switching technology, the high frequency of the inverter began to expand to the field of medium and high power level inverters. Due to the high power Due to the restriction of device switching characteristics, there are still many things to do in this field of high frequency.