Re: Reversed Biased MOSFETS & BJT's?

RogerN wrote:
> I'm working on a battery charger / discharger design.  There is always
the 
> possibility that someone will connect a battery reverse polarity.  I
don't 
> want this to destroy the charger.  I remember the stuff about correctly 
> biasing transistors but how will a BJT or MOSTES act if you have
Collector 
> Emitter or Drain Source reverse biased?  I'm trying to avoid diodes in
the 
> discharge circuit unless the are required as I want to be able to
dicharge 
> to 1V while measuring current and voltage.
> 
> I tried this on simulation and it seems to work (not conduct) but I
don't 
> know if the simulation is realistic with reverse bias.  I can also get a
1A 
> diode to work at 500A in simulation.
> 
> Thanks!
> 
> RogerN
> 
> 
You could also put a hefty diode in series with an appropriate fuse 
(fast fuse) across the battery. If the battery polarity is reversed, 
diode conducts and the fuse pops.

Fred


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