>
> Nicholas Irias wrote:
> >
> > I'm trying to use a PIC to drive several 24 volt DC motors, using an
> > H-bridge so I can get forward and reverse with speed control.  I'm just
> > wondering what the easiest way is to drive the MOSFETS.
> >
> > It's easy to come up with a way to drive the low-side MOSFETS, since they
> > only need 10 volts, but the high side MOSFETs need 34 volts at the gate.
> > And at least the Maxim gate driver chips will only do 18 volts.
> >
> > So far, the only suitable driver I have found is the IR2110 from
> > International Rectifier.  Is this a good way to drive the H-bridge, or is
> > there a better, simpler way to make this work?
>
> Check out Bob Blick's H-Bridge circuit. He uses Darlingtons and BJT's
> instead of MOSFETs.
>
> http://www.bobblick.com/bob/projects/hbridge/index.html
>
> We're implementing a variation of this design here. We're changing the
> Darlingtons to BJT's and adding flyback protection diodes.

The thing that concerned my about that circuit is the 4V voltage drop.

I was hoping to get a circuit that has a minimal drop of the supply voltage
because I'm driving 12V motors with a 12V battery.

Any suggestions?

BAJ