3. 开关式晶体管弧焊电源模拟式晶体管弧焊电源的大功率晶体管组在焊接回路中,工作在放大状态(作可变电阻用)。晶体管组通过的焊接电流很大而且管压降较高,因此功耗很大,既浪费电能又使管子的冷却系统变得很复杂。这个缺点很突出。为了解决这个问题,应使大功率晶体管组运行在开关状态,这就是开关式晶体管弧焊电源。工作在开关状的晶体管组,当它“开” 3. Switching transistor arc welding power source analog transistor power supply welding power transistor in the welding circuit, work in the enlarged state (for variable resistor). The transistor group passes a large welding current and the tube has a high voltage drop and therefore consumes a lot of power, which is a waste of energy and complicates the pipe’s cooling system. This shortcoming is outstanding. In order to solve this problem, should make the high-power transistor group run in the switch state, this is the switch transistor arc welding power source. Working in the switch-like transistor group, when it is “on”