用户侧谐波对精密控制设备的干扰分析

Analysis of Grid High Frequency Harmonic Exerts on Switch Power Supplies

详细分析了用户侧谐波对精密控制设备的干扰,包括精密控制设备的开关电源滤波器的结构和高频等效电路模型,开关电源滤波器插入损耗的计算与仿真。对不同质量电网电源输入下,精密控制设备的开关电源输出电压的谐波含量作了分析,并且给出了仿真结果。结果表明精密控制设备的工作易受电网电能质量的影响,必须引起重视。

The influence that the grid high frequency （HF） harmonic exerts on switch power supplies were analyzed. The structure and the high frequency lumped circuits of the filters, which were widely used in switch power supplies were given. The insertion loss of the filters was calculated and simulated. The output voltage harmonic content of switch power supply was estimated, and the simulation had been done. The result showed that the grid power quality made great influence on the switch power supply and the influence could be estimated.