IC698PSA100

IC698PSA100

IC698PSA100

IC698PSA100

变频器主电路一般是交流—直流—交流模式见图3，外部输入380V/50Hz的工频电源经三相桥路不可控整流成直流电压信号，经滤波电容滤波及大功率晶体管开关元件逆变为频率可变的交流信号。在整流回路中，输入电流的波形为不规则的矩形波，波形按傅立叶级数分解为基波和各次谐波，其中的高次谐波将干扰输入供电系统。在逆变输出回路中，输出电流信号是受PWM载波信号调制的脉冲波形，对于GTR大功率逆变元件，其PWM的载波频率为2～3kHz，而IGBT大功率逆变元件的PWM***高载频可达15kHz。同样，输出回路电流信号也可分解为只含正弦波的基波和其他各次谐波，而高次谐波电流对负载直接干扰。另外高次谐波电流还通过电缆向空间辐射，干扰邻近电气设备。

备货，备货，降降降，火火火，火火火……
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