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Old 09-03-2006, 05:52 AM   #15
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as the ferroresonant transformer (EG old univolt, Magnetech, many others) transformer type convertors and constant current type battery chargers
The Univolt I have has a series voltage regulator in it which makes it a constant voltage and not a constant current type charger. Are you referring to some older type Univolts? Those I have seen are around 1970 models.
Thanks for info.
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Old 09-03-2006, 06:17 AM   #16
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Thanks DFK. I didn't see chargers at that link but I sure enjoyed and agreed with the statement "Batteries never die ...They are murdered!" How true that statement is.
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Old 09-03-2006, 11:25 AM   #17
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I don't know about the micro processor controlled units, BUT the univolt that I have in my trailer is merely a 6 volt AC transformer with a voltage doubling system to give you the 12+ that is required to maintain the battery and give power to the lights etc.. The diodes inside are for blocking and rectification to plusing DC. nothing very complicated. As the battery voltage rises the internal resistance of the battery becomes higher and demands
less current and thus automatically maintains a float charge.
I have worked on many of these type of simple supplies over 40 years.
Much complexity can be introduced with electronic voltage and current controls, better but not necessarliy so.

Rae (Electronic Service Lab)
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Old 09-03-2006, 07:38 PM   #18
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Univolt

FrenchBern et al,
I was referring to the early units IE up to about 1977 or so. There was no electronic series regulator on the early units; voltage regulation was by the transformer design, and you are correct; pretty much like constant voltage up to transformer saturation which was the current limiter but the transformer design gave stable output voltage with varying input voltage.
The Magnetec manufactured 1980's vintage unit I have in the shop lacks voltage regulation, just a center tap voltage doubler like rae described with a very small capacitor for the filtered 2 amp max rated output with the other circuits unfiltered. The constant current reference was to older industrial chargers like mercury arc rectifiers with multi-tap transformers, not used for RV's as far as I know.
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Old 09-04-2006, 11:54 AM   #19
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One good source of general information on battery types ( simple but to the point) is the West advisor; http://www.westmarine.com/webapp/wcs...atterychem.htm Other good links on chargers and converters there too.

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