TMS320F28069M: controlsuite BLDC_SENSORELESS code PWM noise issue

thiru senthilvel kumaran p

Part Number: TMS320F28069M
Other Parts Discussed in Thread: CONTROLSUITE

Hi,

We are flashing the controlsuite BLDC_SENSORLESS code for the inverter test.Here we having some problem on PWM signals attaching the image here.

1.This is pwm from A_HI & A_LO but some noise are visible when we capture it(marked red circle). what was that noise pulse?

2.whether need to modify anything in code?To avoid this noise.

Because facing issue in switching the mosfet.some delay is happening between the switching of mosfets.

3.please provide more clarification on this noise issue.

Thanks&Regards,

senthilvel

over 3 years ago

0 Yanming Luo over 3 years ago

TI__Guru** 117080 points

thiru senthilvel kumaran p said:
1.This is pwm from A_HI & A_LO but some noise are visible when we capture it(marked red circle). what was that noise pulse?

I am not fully understand your question. What do you mean noise pulse? Can you zoom in the figure to show this? Do you change any PWM configuration in this example code?

0 thiru senthilvel kumaran p over 3 years ago in reply to Yanming Luo

Prodigy 80 points

Question : There is an overlapping seen in the pwm for the high and lowside swithches leading to shoot through condition.could you explain the high frequency swithiching happening in the low side switches while high side mosfets are ON?

0 Yanming Luo over 3 years ago in reply to thiru senthilvel kumaran p

TI__Guru** 117080 points

That depends on the PWM configuration you used.

thiru senthilvel kumaran p said:
could you explain the high frequency swithiching happening in the low side switches while high side mosfets are ON?

What frequency on the low-side you mean? Any changed you made in the example code?

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TMS320F28069M: controlsuite BLDC_SENSORELESS code PWM noise issue