Three-phase PWM generator in VHDL

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Hello,
Is there anybody, that know where I can find a free source code to generate
a three-phase PWM to drive an AC motor with the SpartanII Fpga?

Or I have to write myself :-) ?

Thank you for your attention
--
--
Ciao
Giuseppe



Re: Three-phase PWM generator in VHDL

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Well, there is the PWM to modulate the voltages.
Then the voltage has to be somewhat proportional to the frequency and20%
finally the current has to be fed back to control the frequency.

What all of this do you wish to do in an FPGA ?

Rene
--20%
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

Re: Three-phase PWM generator in VHDL
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<CUT>

Thank you for your attention,
I'm interesting only in the PWM to modulate the voltage.
All the other is done with a uP.
I know that is only al counter to do a triangular wave and a compare to set
the output.
But there are also the dead-time and the circuit to cut the impulse with
duration < dead_time.
And other little thinghs.
My first target is something like the Hitachi ITU three-phase PWM generator
function.
The best would be something like the IC BMA828.

Bye
Giuseppe




Re: Three-phase PWM generator in VHDL
I am working with one now. You have to be clear in your requirements, such
as
1) Short circuit detection/shutdown
2) Dead Time
3) Cycle reference (usualy 8 khz)
4) Typically the Phase A, B and C signals have an inverse.
5) Are you using a gate drive (ie IGBT)?
6) Motors produce lotsa noise, any feedback to prevent motor damage (see
item 1) should contain a debounce to validate logic levels.

fabbl



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