Study on Three-phase Six-switch Buck-type Rectifier of High Power Factor

Abstract

This paper proposed a three-phase six-switch buck-type APFC rectifier based on DSP28335. At present, the boost-type power factor correction rectifier has the advantages of high input current power factor and low harmonic distortion. However, it has the disadvantages of high EMI common-mode noise, and the high output voltage also produces negative effect to the DC-DC converter. This paper designed a three-phase six-switch buck-type APFC circuit, which has no shortcomings of the boost-type power factor correction rectifier, but retains the advantages of the boost-type rectifier, which has high input power factor, low harmonic distortion, low output voltage and low EMI common-mode noise. In addition, it has a high conversion efficiency. Finally a 117V input, 60V/138 watts output device is produced for verification.