Hi Champs,
My customer is designing their general inverter using F28066. During their testing, they found some of machine(30%) would report over current occasionally. After debugging F28066, they found the ADC result would be jumping occasionally. For example, most of time the abnormal machine works well because stable F28034’s data sampling result. But it also possible that the ADC result would be jumping which will cause general inverter reporting over current error. The initialization code is as follows, and ADC is triggered by PWM period event.
During our testing, they found if we set the ADC sample window ACQPS to the value other than (8,9,10), the sample result will be good.
And also, if they change the PWM carrier frequency, the failure rate will decrease obviously.
Do you hear such feedback from other customer? Or could be kindly help to find the root cause?
Thanks.
BR,
Young
