Spwm

[ibrahim]

Hello,

Does anybody know how to generate SPWM from 8051 controller or PIC.Actually i am designing Inverter and have to generate SPWM

Thanks

[Dan Baldwin]

SPWM can mean syncronized pulse width modulation, or sinusoidal pulse width modulation. I assume that in this case you mean sinusoidal. If you need single ended operation (just turn a single transistor on and off) the simplest way would probably be to use a lookup table. The table would contain the PWM value to be output for, say, 128 steps in the PWM cycle. The table could be from 90 deg (100% duty cycle) to 270 deg (0% duty cycle). You would step through the table forward for the first half of the cycle, then step throught it backwards for the second half.

Dan

[Acetronics]

Hello,

Does anybody know how to generate SPWM from 8051 controller or PIC.Actually i am designing Inverter and have to generate SPWM

Thanks

Hi, Ibrahim, Hi, Dan

First of All ... have a Happy New Year

Some of the lasts PICs have built in "SPWM" or Enhanced PWM feature : just enter the duty value and the way of rotation ...
And the PIC drives 2 or 4 of its pins to control a half or full bridge ... itself !!!

see i.e the 18F1320 Datasheet ...

I think no more explanation is to give here ...

Alain