Resonant Single-stage PFC Converter With High Efficiency And Low Output Voltage Ripple

In order to reduce the harmonic pollution of power electronic devices to the power grid,the power factor correction（PFC）technique has been widely applied in AC-DC converters.Single-stage PFC converter is very popular in low-power applications,since it features simple topology and control circuit.Single-stage PFC converter with sharing switches can reduce the number of components and circuit cost,while it brings higher voltage stress;the series and parallel compensated single-stage PFC converter can eliminate double-line-frequency ripple,and achieve high efficiency,but the main ciruit,as well as the control circuit are complex.Compared with the two single-stage PFC converters,the current source-charge pump（CS-CP）resonant single-stage PFC converters have the advantages of low cost,simple control,high efficiency,and can achieve high PF and low double-line-frequency ripple in output voltage or current.However,the CS-CP resonant single-stage PFC converters have a variety of working states and modes,which are difficult for the designing of the resonant parameters.In this dissertation,the operation modes of CS-CP resonant single-stage PFC converter is classified into three typical working modes according to the charging and discharging state of the pump capacitor C_boost.Based on the time domain modeling of CS-CP resonant single-stage PFC converter,the switching frequency,as well as the work condition for achieving high PF are well analyzed,besides,the parameter design is also given.The experimental results show that the CS-CP series resonant PFC converter has the characteristics of high PF,high efficiency and low double-line-frequency ripple.Since CS-CP series resonant PFC converter is not suitable for constant voltage mode,the CS-CP LCC resonant single-stage PFC converter is well analyzed in this dissertation,and the parameter design process of the converter under constant voltage condition is presented.The simulation results shows CS-CP LCC resonant single-stage PFC converter has a wider working range compared with CS-CP series resonant single-stage PFC converter,.Finally,the advantages and disadvantages of CS-CP series resonant PFC converter and CS-CP LCC resonant single-stage PFC converter are summarized and compared.The prospect of CS-CP resonant PFC converter is also presented.