焊机电源的高可靠软起动方案与实现

Highly reliable soft-start scheme for welding power supply and its implementation

焊机电源由于包含带大电容负载的整流器,会存在软起动问题。在众多现有的焊机电源软起动方案中,在可靠性方面均存在不足。针对现有方案的缺点,提出了一种新型的高可靠软起动方案,介绍了该软起动方案的各个组成部分及其具体的运行过程,设计了一个具体电路来实现该软起动方案中的全部功能,并且详细的分析了该电路中主要组成部分的工作原理。根据设计好的电路搭建实验所需要的硬件平台,以验证该软起动方案的有效性。对电路中关键检测点波形的分析表明,该软起动方案保证了焊机电源软起动的可靠性。

Tbere is a soft-start problem for welding power supply,because it contains a rectifier with a large capacitive load.The current schemes are not good enough on reliability.Aiming at fixing the defects of the current ones,this article presents a new soft-start scheme with high reliability.The composition of the soft-start scheme and how they work together are shown in detail.A circuit is designed to implement the scheme.The principle of the major parts of the circuit is discussed fully.According to the circuit designed, the experimental platform is built to verify the effectiveness of the soft-start scheme.Finally,on the basis of some key waveforms of the circuit ,the effectiveness of the scheme has been proved