Pulse converters with reduced output current ripple

Abstract

When developing pulse converters, in order to ensure a low level of output current ripples, one should seek a compromise between the overall size of the elements and acceptable losses in them, while taking into account the dynamic characteristics of power sources as closed systems with feedback. Using multiphase pulse converters can help solve the said problem, but will not ensure a low level of output current ripples in a wide range of the duty cycle of the control pulses. This study aims to find a pulse converter topology capable of ensuring the reduction of the output current ripples, while maintaining the power and volume of the structure. The paper demonstrates the relevance of the study of pulse converters aimed at obtaining a low-ripple output current for powering sensitive loads and gives an overview of ways to reduce the ripples and the most common topologies of converters. The authors describe the results of the practical application of the developed experimental stand and analyze the obtained dependences of the output current ripples on the volumes of the power sections of the converters of different topologies under the same power and frequency. Recommendations are given for choosing the type of converter in each specific case in terms of reducing ripples.