commgrp@silver.bacs.indiana.edu (05/04/89)
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