便携式软吸收逆变焊机的研究

Research of the Portable Inverter Arc Welder with Soft Snubber

介绍了一种便携式软吸收逆变焊机电路拓扑。主电路采用具有无源辅助谐振网络的双管正激变换器,与普通双管正激变换器相比,功率管开关状态得到较好的改善,同时并没有增加电路的复杂性。分析了该变换器的工作过程,给出了谐振元件参数的设计方法以及对变压器激磁电感的设计要求。设计并制作了一台开关频率40kHz、最大焊接电流160A的实验样机,电路在额定工作时效率达90%。试验结果证明,该方案能有效提高效率和可靠性,可减小体积、减轻重量、节约成本。

This paper introduces the circuit topology of portable inverter arc welder with soft snubber, mainly power circuit is a double switch forward converter with assistant resonant circuit.Comparing with conventional double switch forward converter,the switching stresses and losses of high power transistors arc reduced and the circuit topology is not complicated.The operating principle is described and the design considerations of key resonant parameters and magnetizing inductance for the topology are presented, and a prototype of switching frequency 40 kHz,arc welding current 160 A using this technology is given, the efficiency at nominal operating is 90%.The experiment shows that it can improve the efficiency and reliability and lower the volume, weight and cost.