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你好:
首先可以肯定的是高频下THD+N肯定会增加,主要原因有:
1.高频下开关次数增加,电压变化频繁,对电源的压力大一些
2.高频段响应速度变慢了,THD+N变大
这个7K-8K的点,也有可能是PWM频率的倍频处,所以突然下降的比较厉害