焊接电源中谐波和电磁干扰的分析

Study on the harmonics and EMI of switching power supply for welding power source

为了分析焊接电源电能质量,通过对高频大功率整流和逆变开关电源理论的分析可知,焊接电源的谐波和电磁干扰是影响焊接电能质量的主要污染源。同时通过实验可知,在开关电源中除了有谐波的传导干扰外,还存在电磁的辐射干扰,因此,在焊接电源中必须要对谐波进行抑制和电磁干扰进行处理。

In order to study the electric energy quality of switching power supply,through the theoretical analysis on the high frequency large-power rectification and the reverse switch supply theory,we conclude that the welding switch supply is the main polluting source of affecting the power energy quality.At the same time ,we obtain high harmonic components of the welding switching supply are the major reasons leading to the system polluted.The test shows that the the wave of time field and frequency field of EMI of welding switching power supply was tested,which shows the EMI still exists besides the conduction interference of harmonic in the high power switching power supply.So we must restrict harmonics and EMI.