120 degrees phase shift for three-phase pwm? Any ideas?

[sayzer]

Hi Sougata,

For me, what I need is not sophisticated.

At first I would like to control the speed of the motor via a pot or couple of buttons.
Then I can get it modified as I needed.

So far, mister_e advised me to consider 18F2331 or 18F2431 or 4431. Thanks to him very much.

I need to use PBP so that I can modify and understand the concept easily.

Not a very sensitive control I need. Errors are very flexible in my case also.

But I have no idea where to start. I have good examples in ASM which I am no good at.

I would appreciate some information.



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[declan]

hi, everyone!
the pwms that i need is very simple: just need to be same in amplitude and frequency as well as duty cycle.
but have to be 120 degrees offset from each other.
the pwms will pass through a 3-phase bridge driver and appear as control signals at the gate terminal of the 3-phase inverter.
the examples on microchip website shows that they are using a lookup table to update the duty cycle. what is a lookup table? how to do that?

by the way what is soft pwm?

have a nice day!!