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TIDA-010062: Sine AC frequency

Part Number: TIDA-010062


Hello,

When debug our board based on TIDA-010062 SW. The board can only work in fixed 50 or 60Hz.

The function in TTPLPFC_autoStart 

if(TTPLPFC_sine_mains.acFreq > 55)
{
TTPLPFC_sine_mains.acFreq = 60;
}
else
{
TTPLPFC_sine_mains.acFreq = 50;
}
What's the purpose of fix only two frequency?

After I remove these code, it can work on other frequency.

Another question:

The board should able to track AC frequency drift. For SPLL frequency only initial at TTPLPFC_autoStart. If AC frequcey dift after that, the SPLL will not able to track AC frequcy. Do you have any idea how to track the drift? Where the SPLL re-initial function place?