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TMS320F280049: PWM的频率突然变小

Part Number: TMS320F280049

hi,

我们在调试过程中发现,EPWM4和EPWM7的频率会突然发生变化,但是此时相应的周期寄存器,并没有变化。如下波形

CH1, CH2,CH5 是MCU发出来的PWM信号,其中CH1和CH5是Epwm4A和Epwm4B互补。

正常情况下,我们是变频加移相控制策略,duty是50%

这个问题比较紧急,还请帮忙加速处理

thanks