Research and Design of Auxiliary Power Supply with High Voltage and Wide Range Input

As an important part of power conversion device, auxiliary power supply is faced with the application demand of high-voltage and wide-range in solar power station and other systems. Aiming at the problems of switching stress, cost and efficiency caused by high-voltage and wide-range input, the principle analysis and parameter design were carried out based on the series-connected MOSFETs flyback converter, and a 100W auxiliary power supply prototype with 300-1500V input and 24V output was designed. Compared with the traditional scheme, this topology can simply and effectively reduce the voltage stress of the switch by using Zener diodes. And it can broaden the selection range of switch and improve the efficiency. Finally, the results of the relevant experiments have been given to verify the feasibility of the proposed auxiliary power supply scheme. A low-cost wide input range and high stress power conversion have been realized.