ソフトスイッチング高力率昇圧形AC/DCコンバータと基本解析

抄録

By a combination of a loss-less snubber and sensing of the current or voltage, soft-switched high power factor AC/DC converters are realized by a simple circuit construction. In this paper the boost type AC/DC converter applying this soft switching technique is analyzed. In this case, a nonlinear differential equation for the output voltage is obtained and solved under the proper assumptions in order to derive the circuit characteristics such as the power factor and output voltage as the functions of the circuit parameters. Next these analytical results are verified by the experiments. These converters are need two times voltage of the input peak voltage for soft switching. At last, a new technique to spread the range of the soft switching is proposed.