sine pwm(spwm)

[mahdi70]

hi...i don't know anything about spwm...what is it? how can i generate spwm with pic16f series?
what is lookup table??
tnx

[temtronic]

Google should be your 'friend' ! There are 100s if not 1,000s of 'hits' regarding PICs and sine PWM, including thesis, code and connections.

SinePWM is too vague or broad a term to really help you as it's the details that determine how to proceed. 16F series PICs can easily do 'sinePWM'.

As for what a 'lookup table' is, generally speaking it is a table (a list) of data (values) that a PIC accesses in sequential order to transfer to a PWM peripheral. Usually the PIC will 'loop' through this this at a predetermined rate (frequency) to generate the 'wave'. The large (long) table can create a better (finer) sine PWM.

You'll need to do a LOT of reading once you KNOW the parameters (details) of the sinePWm you need to make.

Jay

[mahdi70]

Before i create this topic i searched in this forum and google but I didn't catch.
....how can i put lookup table data on pwm duty? Do I need to change hardware? For example add lpf filter?

[asmboy]

just search on sine
many hits come up
or

http://www.ccsinfo.com/forum/viewtopic.php?t=50140&highlight=sine