TMS320F28388D: Undesired varying switching Period/Frequency of Unipolar SPWM using ePWM blocks in Simulink

Andrew Glover Martey

Part Number: TMS320F28388D

I am implementing unipolar SPWM using ePWM blocks in Simulink. The period of the observed PWM is not constant. The switching frequency measured on the oscilloscope is not constant even though I expect a constant frequency of about 600 Hz. Frequency is varying between appx 500Hz to 750 Hz.

What could I be missing?

See attached the Simulink design.

over 3 years ago

0 Santosh Jha over 3 years ago

TI__Guru 50611 points

Hi,

Please take a look at MathWorks FAQ at this link below:

If you have further questions, the best way to get support on MathWorks products is to contact MathWorks live tech support.

You can also search for answers or post a question on MATLAB Answers C2000 forum. Additionally, there is info on MathWorks support C2000 in Documentation and Examples.

I will close the thread from here as the software is supported by MathWorks team on their forum.

Thanks & Regards,

Santosh

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28388D: Undesired varying switching Period/Frequency of Unipolar SPWM using ePWM blocks in Simulink