STM32F4对PWM方波进行FFT谐波分析并计算1次至5次谐波幅值

上传者: 52700755 | 上传时间: 2023-02-21 16:01:53 | 文件大小: 1.38MB | 文件类型: 7Z
PWM初始生成1khz(可调)信号,通过定时器3设置采样频率为280khz(可调)对PWM方波进行采样,并对采样后序列进行FFT谐波分析,通过分析谐波频率计算出1次、3次和5次谐波的幅值,并通过串口打印出来。通过串口3和蓝牙通信,实现手机控制PWM输出频率。信号频率和采样频率的设置应服从采样定理。实验发现信号频率较低时(小于20khz)可以采集到完整的5次谐波。信号频率较大时(100khz左右)只能计算出1次谐波和3次谐波。如果提高采样频率,性能应该还会进一步提高。

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