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sinusoidal reference current

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abel51

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Hi

I am trying to program closed loop SPWM controller for an inverter using dsPIC33.

I get the feedback ac current and want to compare it with a sinusoidal reference current. So can anyone tell me how to generate 60Hz sinusoidal reference current in my dsPIC33. I only have the peak value of the sinusiod. Any suggestions or sample code will be greatly appreciated.

Regards,
 

I a situation like this, I always store samples of the sine wave in a look-up table. The number of samples required will be determined according to you sampling frequency (also switching frequency in your case).
 

we faced the same situation but not at a big level.... what we did was found the time period T of the sine wave needed and then divided it by the maximum value N that could be stored in the register.... now we have the time period for each count... so we introduced delay equal to this time for each increment and kept outputting the register value each time.....
 

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