Re: Power regulation.

On Sat, 30 Apr 2005 14:53:32 +0100, "R.Lewis"
<h.lewis@xxxxxxxxxxxxxxx> wrote:

>
>"Colin Dawson" <newsgroups@xxxxxxxxxxxx> wrote in message
>news:H0Jce.7870$j54.5302@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Hi all.
>>
>> I'm looking to build a power regulator. However, it's not as straight
>> forwards as I first thought. Basically, I'm looking to have a variable
>> input voltage that ranges between 11v and 13.8v (an 85Ah Lead Acid
>> battery). The output from the regulator will need to be able to support a
>> continuous 2A, at 15V. Instead of making a fixed regulator, I'd like to
>> overengineer it so that it is switchable between 12v, 13.8v, 15v and
>> possibly 18v (although this can be ommitted).
>>
>> Can anyone give me some pointers one how to go about doing this.
>>
>> Regards
>>
>> Colin Dawson
>> www.cjdawson.com
>
>13.8 volts is the common figure used for float charging a lead-acid battery.
>Boost/float or boost/trickle chargers will produce higher battery voltages
>toward the end of the boost phase around 2.35 to 2.4 vpc.
>
>11 volts is a bit high for a low battery cut-off. 1.7vpc (i.e.10.2V in your
>case) is considered a practical but conservative voltage cut-off. Many
>commercial units go for 1.5 vpc.
>
>Have a look at national-semi's 'simple switchers' and their counterparts.
>This is fairly straight forward stuff..
>A discontinuous flyback is the easiest for your job.
>

But he needs Vout to go both above and below Vin.

John


.

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