역률개선과 고조파 저감을 위한 전류공진 승압형 AC-DC 컨버터의 특성 해석

Analysis of Characteristics for Current Resonant type Boost AC-DC Converter for PFC and Reducing Harmonics

In this paper, the characteristics of the proposed converter are show by simulation. As a result, the power factor is improved and the results show the usefulness of the proposed circuit. To improve the hard switching at turn-off of the basic circuit, the circuit using a current resonant switch is proposed. In the proposed circuit, THD of the input current is reduced to 1.8 of the basic circuit. The mechanism of the THD reduction is clarified. That is because the on period becomes shorter at the peak of the source voltage. Using the simulation, the characteristics of the output voltage, current flowing the switch, and THD of the input current are investigated by changing the resonant circuit parameters. Criteria for choosing resonant parameters of smaller THD are obtained.