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
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Ciao
Giuseppe
Three-phase PWM generator in VHDL
Jun 03, 2004
3 Replies
rate
Well, there is the PWM to modulate the voltages. Then the voltage has to be somewhat proportional to the frequency and=20 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
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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
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
generate
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