Re: Home Brew Chargers anyone?

Tim,
Would this mess with the interface between the microcontroller, A-D, D-A, 
etc?

I got an idea from the flyback design.  Using a Boost SMPS.  If the Vin is

from say 11V to 16V, any charging below 20V is charged between +Vin and 
+Vout.  Likewise, any charging above 20V would be charged between Gnd and 
+Vout.  Or everything could be charged between +Vin and +Vout.  Should be 
about the same as flyback but not inverted ... an inverted flyback!  Maybe

the inverted output wouldn't be difficult for the analog and digital 
interface, I'm just not used to working with the inverted, I'll have to 
think about it some more.

Thanks!

RogerN

"Tim Wescott" <tim@[EMAIL PROTECTED]
> wrote in message 
news:wYmdnUq0lYVjI3fVnZ2dnUVZ_sTinZ2d@[EMAIL PROTECTED]
>
>>
> Why not use a flyback topology, with the battery connected between your
+V 
> and the output?  It'll give you 0 - whatever volt output, at the cost of

> having the battery floating above your ground reference.  As long as you

> don't bring the battery + terminal above some magic regulatory voltage
WRT 
> ground (I think 60VDC or so is where some regulatory hurdles start
popping 
> up in most places) you shouldn't have problems.
>
>
>
>          .---------------------o----o  -battery
>          |                     |
>          |                     |
>          |                    ---
>          |                    ---
>          |                     |
>   +12V   |   ___               |
>     o----o---UUU----o---->|----o----o  +battery
>                     |
>                     |
>   gate drive     ||-+
>                  ||<-
>    o-------------||-+
>                     |
>                     |
>                    ===
>                    GND
> (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)
>
>
> -- 
>
> Tim Wescott
> Wescott Design Services
> http://www.wescottdesign.com
>
> Do you need to implement control loops in software?
> "Applied Control Theory for Embedded Systems" gives you just what it
says.
> See details at http://www.wescottdesign.com/actfes/actfes.html