Research and realization of PWM drive control digitalization for the full digital welding power supply  

作　　者：段彬 孙同景 李振华 梅高青 张光先 

机构地区：[1]School of Control Science and Engineering, Shandong University, Jinan, 250061.

出　　处：《China Welding》2009年第4期76-80,共5页中国焊接（英文版）

摘　　要：Pulse width modulation （ PWM） drive control digitalization is the key for the full digital invert power supply. New ideas are proposed, which are based on field programmable gate array （ FPGA ）. First, digital PWM principles are discussed. The primary and secondary current characteristics are analyzed when the transformer is in both normal and magnetic bias conditions. Second, two digitalization methods are put forward after the research on PWM adjustment principles, which are based on the primary current feedback. Though the two methods could restrain magnetic bias, their realization is difficult. A new method is researched on double close-loops to overcome the above shortcomings, which uses the secondary current as the feedback signal and the primary current as the protection signal. Finally, the secondary current control made is discussed and realized. Welding experimental results show that the method has strong flexibility and adaptability, which can be used to realize the full digital welding power supply.

关 键 词：full digital welding power supply primary current feedback secondary current feedback field programmable gate array 

分 类 号：TN72[电子电信—电路与系统] TN949.12