CAJ | 학술논문

针对传统Buck功率因数校正(power factor correction， PFC)变换器输入电流谐波分量高的问题，提出一种单开关Buck-Flyback PFC变换器。它由Buck PFC变换器与Flyback PFC变换器的输入和输出分别并联并合并主开关管而构成。当输入电压低于输出电压时，变换器工作于Flyback模式，消除了传统Buck PFC变换器的输入电流死区，进而降低了输入电流谐波。分析工作在断续模式的单开关Buck-Flyback PFC变换器的输入电流特性，理论分析表明，该变换器可在全电压输入范围内获得高功率因数与低总谐波失真率，满足<br>　　IEC 61000-3-2 C类法规对输入电流各次谐波的要求。最后，通过一台96 W实验样机验证理论分析的正确性。
침대전통Buck공솔인수교정(power factor correction， PFC)변환기수입전류해파분량고적문제，제출일충단개관Buck-Flyback PFC변환기。타유Buck PFC변환기여Flyback PFC변환기적수입화수출분별병련병합병주개관관이구성。당수입전압저우수출전압시，변환기공작우Flyback모식，소제료전통Buck PFC변환기적수입전류사구，진이강저료수입전류해파。분석공작재단속모식적단개관Buck-Flyback PFC변환기적수입전류특성，이론분석표명，해변환기가재전전압수입범위내획득고공솔인수여저총해파실진솔，만족<br>　　IEC 61000-3-2 C류법규대수입전류각차해파적요구。최후，통과일태96 W실험양궤험증이론분석적정학성。
Conventional Buck power factor correction (PFC) converter has the disadvantage of large harmonic currents. In order to solve the problem, a single-switch Buck-Flyback PFC converter was proposed in this paper. The converter consists of Buck PFC converter and Flyback PFC converter, which is input-parallel-output-parallel (IPOP) connected. When the input voltage is lower than the output voltage, the converter operates in Flyback mode. Therefore, the dead zone of input current in conventional Buck PFC converter can be eliminated. In addition, the input current characteristics of the converter operating in discontinuous conduction mode (DCM) were analyzed. Theoretical analysis shows that the converter can achieve high power factor and low total harmonic distortion (THD), and the input current can meet the IEC 61000-3-2 class C standard within the universal input voltage range. Finally, the theoretical analysis in this paper was verified by a 96 W prototype.