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posted to aus.electronics,rec.boats.electronics,sci.electronics.basics,sci.electronics.design,sci.electronics.misc
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On Sat, 21 Apr 2007 21:49:14 +1000, "marcus" wrote:
Has anyone come across a circuit for a manually-adjustable, or even automatic regulator circuit to control a 24V car alternator? Application is deep-cycle solar battery charging using 3-5HP small petrol motor coupled to 24V alternator. Need to tweak the voltage up to about 29-30V to equalise the batteries. Solar batteries like a 3-stage charging regime - boost, bulk & float. These voltages are all diff. and also depend on battery type (chemistry), so the field needs to have these adjustable set-points. Would be nice to be able to sense battery voltage and feedback into alternator field voltage, to make a set-and-forget circuit. Here's some background (12V, and no feedback) : http://www.homepower.com/files/mark8.pdf Thanks to everyone in aus.electronics who had a look at this. Jim Thompson : I notice from your web pages that you have designed some car alternator regulation projects - wondering if you have any thoughts? Thanks all Marcus in outback Oz I couldn't see the file you reference. but 12 volt alternators can put out 14 volts at idle so with just a pulley adjustment or running them faster the voltage goes up proportionately. From that point on it is just a matter of a regulator. I have a two transistor regulator that I scrounged from a Chilton's manual back in '72. They didn't show component values, but I put what I thought would work and it did in a BMW motorcycle and Toyota Land Cruiser. Doesn't do anything fancy like float at a lower voltage, but I could post the schematic if you want or email it. Very simple device - NPN pass transistor is biased "on" with a resistor (turning on the rotor) and a second transistor turns it off when the Zener/ and potentiometer-setting voltage is exceeded. The Chilton's manual showed fixed resistors - I used a military spec wire wound pot to set the voltage. The BMW reg was in the bike for 10 years (in the weather) and I had no problems with it other than painting the transistors so the TO66 cases wouldn't rust through - on the land cruiser I used a 2N3055 and it never rusted in the engine compartment. No heatsink was needed - the rotor would pull about 3 amps maximum. -- ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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