[Diy_efi] CIS EFI via Fuel Pump PWM

[bcroe at juno.com]

Thanks for the thoughts.  Bruce Roe

On Fri, 9 Aug 2002 13:01:33 -0500 Marc Reviel <marc at powerlogix.com>
writes:
> >Do you have a drawing for that simple 30 amp 20 volt boost 
> >regulator?  

> >Bruce Roe

>  I don't have that exact schematic, but all it is really is just a 
> beefed-up, old-as-hills boost converter topology. I agree that's 
> a fairly heavy 'hunk' of current. But with todays MOSFETs it's 
> trivial. The catch diode will be rather large, definitely want to 
> use Schottkies.
>  Boost converters must store energy in the inductor. In this 
> 30A ap, this would make the inductor fairly large. It might be 
> better to use a full-cycle converter topology, such as a 
> push-pull.  This way, the magetics use transformer action, 
> rather than rely on pure energy storage, keeping the 
> magnetics smaller. The windings ratio can be reduced by 
> connecting the centertapped output to Vbat. So, a desired 
> 20V output would be from a transformer set up for an 8V 
> nominal output added to Vbatt.

> Marc Reviel

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