Research and implementation of double-tube flyback auxiliary power supply with high-voltage and wide-range input

Abstract

According to power supply requirements of power electronic converter with high-voltage and wide-range input，a double-tube flyback auxiliary switching power supply was designed. The operation principle of the double-tube flyback converter was analyzed. In order to solve the problem of current loop subharmonic oscillation from the wide-range input voltage，a slope compensation circuit was designed. A low-loss start-up circuit of current-mode double-tube flyback converter was presented. Experiments show that the design of the auxiliary switching power supply for power electronic converter is reliable and feasible.

Keywords

• double-tube flyback
• high-voltage and wide-range input
• current control
• slope compensation