multiple pwm + induction motor + at89sxx

[firmansyah]

can any one give source code generating multiple pwm( where the width of pwm pulse variable according to reference sinusoidal input signal"
i use to control induction motor single phase
.thanks

 

[kinjalgp]

None of the 89Sxx Microcontrollers have in-built PWM generator. And using software you won't be able to generate very high frequency.
Use P89C51RD2 or AT89C51RD2 which has 5 hardware PWM generators.

 

[firmansyah]

i dont need generate high freq pwm
i just need generating pulse with variable width according the amplitude of sinusoidal from home electric.
i hear abaout "magic sine"
but i forget where?

 

[kinjalgp]

Here it is:
http://tinaja.com/magsn01.asp

And
http://www.dtweed.com/circuitcellar/caj00059.htm#854