Re: Sv: [CAD_CAM_EDM_DRO] 3 Phase drive

"J. J. Larsen" wrote:

> Maybe this could be of some interrest
>
> http://motor.irf.com/
>
> I have not checked it out, just saw the headlines.

Yes, IR has the entire power section of the inverter, but you still
need to provide the transistor drive signals. They take either
TTL or 12V logic levels, and give you back fault signals, but
you've still got to provide the signals that turn the transistors
on and off it the right sequence to provide either a simple
3-phase square waveform or a PWM train that averages out
to a sine wave. Making the PWM wave average out to a
sine wave of arbitrary voltage is the tricky part, but the result
is worth the effort.

The ML4423 chip was a closed-loop controller for a PWM
amplifier, so all you had to add was about 25 passive components
and the power section.

Jon