New Single-stage PFC Converter And Output Voltage Second Harmonic Reduction Control Strategy

Power electronic devices need to use power factor correction(PFC)technology to solve the problem of harmonic pollution.Active power factor correction(APFC)converter circuit,even in the case where the effect of power factor correction is ideal,so that the input current is a sinusoidal current in phase with the input voltage,the instantaneous power input still has an average power amplitude Double power frequency harmonic component,that is,the frequency is twice the frequency of the input AC sinusoidal voltage,so it is called the power second harmonic.According to this situation,the main purpose of this study is to find a control strategy that can effectively reduce the second harmonic component of the output voltage without adding any additional components in the main circuit of the power stage.The first chapter of this paper introduces the research background,introduces the research purpose of this paper,and expounds the research status and main research content of this paper.The second chapter,the inductance current continuous mode boost power factor correction converter,no bridge type boost power factor correction converter,controlled full bridge power factor correction converter and Cuk type power factor correction converter main circuit of the working status and characteristics are analyzed,and the simulation,mainly to observe the effects of second harmonic component of output voltage.In the third chapter,a novel single-stage power correction converter with high power factor and high conversion efficiency is proposed.Only three controllable MOS switches are needed,and no additional grounding isolation is required when the drive circuit is fabricated for the source electrode.Then,an approximate second harmonic equivalent circuit model is proposed,which has not been proposed in other literatures.In the fourth chapter,the relationship between the second harmonic and the equivalent circuit model are used to analyze and propose a control strategy to reduce the second harmonic components of output voltage.According to the theory and analysis results of this paper,the filter parameters of a new power factor correction converter are designed.Contrast simulation did not join the second harmonic control strategy and join the closed-loop control structure,the control strategy of the second harmonic second harmonic of the proposed control strategy is verified the feasibility of the simulation results for second harmonic control strategy can reduce the output voltage second harmonic component of more than 90%,at the same time can be maintained at the input power factor above 0.99.