烧电焊时用的led灯(投光灯总是一会就坏了什么原因(灯和焊机同一个插板)不是驱动电源坏就是灯珠坏。
推荐回答（2个）
您说的这个问题，基本上可以判断是电焊机在运行过程中产生的谐波，导致了LED灯损坏，这个可以在电焊机的电源上加装MLAD-VR交流电抗器来试试。
一、电焊机谐波
我国是交流弧焊机最大的生产与使用国，以动铁式弧焊变压器为例：由于变压器叠片导磁率的非线性和周期性的磁滞现象,在交变磁场作用下，使空载电流，磁通与感应电压产生较大的波形畸变。随着动铁心向外移动，电流波形的畸变越严重。实验证明其3次和5次谐波，可分别达到基波的58%与25%，此时当外施额定电压增加10%时，励磁电流几乎增大一倍。
众所周知,交焊机功率因数低，无功能耗相当可观。当前，国内普及应用的电力电子型焊机,正在成为电网又一最主要的谐波源。经典的可控硅整流焊机，新兴的未使用电磁兼容技术的IGBT逆变焊机，由于是非线性用电设备，均存在在交流侧电网电压产生畸变问题.了。因此，业内专家学者已提出从”污染”到”绿色”转变的呼吁。
谐波
二、谐波的危害
谐波是电网的大敌，是电力公
害。归结起来谐波有九大危害：
1)会显着缩短白炽灯的寿
命
2)会使保险丝电流特性曲线
位移,造成非正常停电
3)会对电动机造成附加损
耗,产生机械振动与噪声
4)会造成大量的电力损失
5)会使功率因数集中补偿的
电容器发热甚至爆炸
6)会使电子设备误动或拒
动,造成系统故障
7)会对电压表,电流表,功
率表,电能表等计量产生误差,造成错误信息
8)干扰网络通信,收音效果或造成视听中断
9)对产生谐波的电器设备自身造成损害等
电焊机工作时电流很大，而且其一次线圈电感量比较大，感性负荷电路的特点是电压超前电流90度，因为电感对电流的变化有抗拒作用。当流过电感器件的电流变化时，在其两端产生感应电动势，其极性是阻碍电流变化的。当电流增加时，将阻碍电流的增加，当电流减小时，将反过来阻碍电流的减小。这使得流过电感的电流不能发生突变，在起弧和断弧时电感两端电压会产生突变，产生很大的瞬间反冲电势，对电源和附近的用电设备产生冲击甚至损坏。所以电焊机接电源有很多注意事项，你这仅仅是烧了灯具，损坏贵重设备的例子也不少。
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