PWM injector driver

rr RRauscher at nni.com
Sun Apr 8 16:14:48 GMT 2001


RE: running PnH's at 24 v.

I've thought about this. It seems as though the standard 4/1 A PnH
circuit would suffice. The driver dissipation would double when at the
hold current. Other then that it looks do-able. I'll bet that the injector
would open quite a bit faster.

BobR.

Bruce Plecan wrote:

> > At 9:42 PM 4/7/01, Bruce Plecan wrote:
> > >What I did some time ago was
> > >Let the ecm supply the over all pulse width.
> > >I used that to trigger two power mosfets,  one had 8 ohms in series with
> the
> > >injector, and then a 555 astable mode with no resistor.    After the
> astable
> > >timed out then all that was left was the one with the 8 ohm series
> resistor,
> > >and the the open signal of the ecm tuned off the mosfet.
>
> > Didn't try it with a switching power supply feeding a lower voltage to the
> > mosfet that stayed on instead of a resistor, eh??
>
> He said *switching power supply* <beavis>.
> Doc just leaft the room looking to see if it's menitoned in any of Forrest
> Mimms stuff.
>
> > Also pondering on a diode in series with the injector, then apply reverse
> > voltage when time to close, just to collapse the field/stop the current,
> > not to do an actual reverse current.
> > Thoughts???
>
> What I'd like to do is run em on 24v, for opening, min V for On, and then
> off.
> Bruce
>
> ----------------------------------------------------------------------------

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