Using TMS320F28027 Piccolo in off-line 3-ph BLDC motor drive, approx. 25 Watts, Fsw = 20kHz. We want to use a passive valley fill rectifier front end at 50% ripple voltage. Is there a way to adjust the feed forward DC bus input to the Piccolo to reject the 120Hz DC bus ripple? Using the EVM we start getting appreciable 120hz feed through of the rectified mains when we have greater than 15% input voltage ripple.
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