Методи боротьби з кондуктивною завадоемісією у зворотноходових перетворювачах

Abstract

Pulsed power supplies of various topologies (return running, forward running, half-bridge and full-bridge converters) generate high-frequency common-mode noise through their high-frequency mode of pulse-width modulation. Electrical and electronic equipment is known to comply with electromagnetic compatibility standards such as CISPR, IEC, EN, FCC. If necessary, to reduce the converter mass, the pulse-width modulation frequency will increase. As a result, the electromagnetic noise of the power source also becomes larger. Therefore, electromagnetic compatibility problems become one of the most difficult to design power supplies.The article presents methods for reducing conducted noise emission, namely the suppression of common-mode noise in switching power supplies. In particular, schematic methods and methods with constructive changes, physical harmonics compensation methods (interleaving), and methods based on special control methods are presented. The structural and compensation approach allows achieving significant results in reducing the level of common-mode noise. The structural approach includes grounding and shielding. The compensation approach includes three methods: the first is the method of mutual compensation of noise sources; the second is the method of quasicompensation of noise sources; the third is the method of active compensation. The conducted simulation confirmed the decrease in the emission of higher harmonics of the input current in the power network.