Need switching batt. charger

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Article #21302

#21302

From: commgrp
Date: Wed, 03 May 1989 22:20

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I'm looking for suggestions/references for building a switching-
regulator battery charger.

Requirements:

     Input:    12v (car electrical system).

     Output:   4-5v @ 1.5 amp max, constant voltage, current limited.

     Load:     4-volt Koehler Wheat Lamp (tm) miner's lamp
               (two 14 amp-hour lead-acid wet cells in series).

     Output should be RFI-suppressed and foolproof, i.e., short-
     circuit and reverse-polarity protected.

Application:
     Cave explorers need efficient battery chargers for expeditions in 
     remote areas.  Adjustable 3-terminal linear regulators (LM340) 
     work well but run hot, wasting twice as much energy as they put 
     into the 4-volt battery.  Charging multiple batteries in series 
     is not practicable.

Thanks in advance; e-mail replies don't always go.

--

Frank Reid     NSS 9086F    W9MKV @ K9IU   reidgold.bacs.indiana.edu
{inuxc,rutgers,uunet!uiucdcs,pur-ee}!iuvax!silver!commgrp
bitnet: reid@iubacs

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!deimos.cis.ksu.edu!uxc!iuvax!silver!commgrp
From: commgrp@silver.bacs.indiana.edu
Newsgroups: sci.electronics
Subject: Need switching batt. charger
Message-ID: <7200035@silver>
Date: 3 May 89 22:20:00 GMT
Organization: Indiana University CSCI, Bloomington
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Nf-ID: #N:silver:7200035:000:985
Nf-From: silver.bacs.indiana.edu!commgrp    May  3 17:20:00 1989