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TMS320F280049C: Will the switching frequency and sampling frequency affect the control effect of the main loop?

Yale Li 李耀先
Expert 4660 points

Part Number: TMS320F280049C

Hi Team,

Here's an issue from the customer may need your help:

Three-phase current mode PWM rectifier, ADC interrupt input frequency is 50kHz, switching frequency is 200kHz.

When the input voltage rises to 20V during debugging, serious harmonic distortion appears in the input current.

Sampling and other links have been tested, and there is no problem. It is speculated that the relationship between switching frequency and sampling frequency affects the control effect of the main loop. We would like to know if anyone has encountered the same issue.

The reason why the interrupt frequency is 50kHz is because the library functions in the project configured with Syscfg run very slowly, so the interrupt frequency has to be reduced. Is there any good way to solve this problem?

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Thanks & Regards

Yale