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大功率三级管电源具有一般其它形式不能及的优良性能,近年来,某些先进工业国家已从试验研究阶段进入了生产领域,为了摸索这种新型电源的特点和规律,我厂与上海第二纺织机诫厂合作于1977年试制了50A大功率三极管电源用于脉冲钨极氩弧焊,经过一年多的实际使用,基本上达到了设计要求,焊机基本参数如下: 1、最大焊接电流:50A; 2、电流调节范围:0～50A连续可调; 3、外特性:垂直徒降; 4、脉冲焊频率:0.5～20Hz; 5、输出波形:方波。主回路采用5只Pcm=300W,Icm=30A的大功率三极管并联运行,为了达到对焊接电流精度的控制,采用了集成电路运算放大器对焊接电流实行闭环控制的方式,中间环节的设计留有较大裕量,以便当需要更大焊接电流时只要增加并联大功率三极管的只数即可方便的达到目的。为了保证当高压脉冲引弧时保证大功率三极管不被击穿,采用了附加引弧电流短时接通方式。上海第二纺织机械厂利用本设备进行了0.25mm和0.05mm不锈钢对接焊,都获得了满意的效果。
In recent years, some advanced industrial countries have entered the field of production from the pilot stage, in order to explore the characteristics and laws of this new type of power supply, I plant and the Shanghai Two textile machine admonitory plant cooperation trial in 1977, 50A high-power transistor power supply for TIG welding, after more than a year of actual use, basically reached the design requirements, the basic parameters of the welding machine as follows: 1, the maximum welding Current: 50A; 2, the current adjustment range: 0 ~ 50A continuously adjustable; 3, the external characteristics: vertical drop; 4, pulse welding frequency: 0.5 ~ 20Hz; 5, the output waveform: square wave. The main circuit uses five Pcm = 300W, Icm = 30A high-power transistor running in parallel, in order to achieve the control of the welding current accuracy, the use of integrated circuit operational amplifier closed-loop control of the welding current way, the middle part of the design left more Large margin, so that when the need for greater welding current simply increase the number of parallel high-power transistor can be easily achieved. In order to ensure that when the high-voltage pulse arc to ensure that the high-power transistor is not breakdown, with additional arc current short-time access. Shanghai Second Textile Machinery Factory used the equipment for 0.25mm and 0.05mm stainless steel butt welding, have obtained satisfactory results.