TITLE:
A Novel Method of Auxiliary Power Supply Used in Wide-Range High Voltage Input DC-DC Converter
AUTHORS:
Jie Zhang, Liangjie Li, Cuicui Liu
KEYWORDS:
Dual Switch Forward Converter, Wide-Range Input, Auxiliary Winding of Power Supply, Buck Converter
JOURNAL NAME:
Energy and Power Engineering,
Vol.9 No.4B,
April
6,
2017
ABSTRACT: In high voltage input DC-DC converter, auxiliary winding of isolation transformer is usually used to supply power for control circuit. Due to the wide-range of input voltage, the variable output voltage of auxiliary winding will cause a series of problems, such as variable drive pulse amplitude, increased driver switching devices loss and drive transformer core saturation. This paper analyzes the influence of variable output voltage of auxiliary winding in detail. A novel method is proposed to solve the problem of large variation range of auxiliary winding output voltage, which is adding a buck converter between the auxiliary winding and the control circuit. A dual switch forward convert has been designed with 300 V - 800 V input and 24 V/5 A output. The results show that this method is effective by comparing the different results of using buck converter or not.