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Bubba12345bubba
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PostPosted: Sun Aug 12, 2007 8:14 pm    Post subject: Power Supply Help Reply with quote

I have been searching for a nominal 36vdc to nominal 12vdc regulator/supply.

Specifics: I have a 36 volt golf cart and would like to add one headlight (about 10 amps) and a decent car stereo. Yes, its possible to simply tap two of the 6 volt (6 in total) battries but that presents wiring issues and uneven use of the batteries.

Hoping someone can point me to an off the shelf supply or good plans to build it myself...
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun Aug 12, 2007 10:27 pm    Post subject: Reply with quote

TRACOPOWER TEN 4-2422
DC/DC CONVERTER, 4W +/-12VDC/DC CONVERTER, 4W +/-12V; Power rating:4W; DC/DCConverter O/P type:Dual Common 0V; Voltage, input max:36V dc; Voltage, ...
www.newark.com/jsp/search/productdetail.jsp?SKU=13M3076&CMP=AFC-GB100000001
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Aug 13, 2007 10:02 am    Post subject: Reply with quote

There are plenty of 24/12 V converters used for powering car stereo, communication radio etc in heavy trucks. Most of them (at least those using switch mode technology) will easily cope with a 36 V input as they must withstand the voltage surges that might be caused by the alternator in the truck's electrical system. Just make sure that electrolytic capacitors etc in the input circuitry have at least 40 V of working voltage.
Those units are easy to find at car breaking yards dealing with heavy vehicles.

Regarding the headlights, an economical approach would be connecting the lamp filaments and a ballast resistor in series to add up to 36 V nominal voltage. Remember that headlight lamps marked "12 V" are in fact made for 12,8 V or 13,2 V nominal voltage.
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PostPosted: Tue Aug 14, 2007 2:04 pm    Post subject: Reply with quote

Umm, 4 watts? Need a wee bit more than that.
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PostPosted: Tue Aug 14, 2007 2:07 pm    Post subject: Reply with quote

torbjorn wrote:
There are plenty of 24/12 V converters used for powering car stereo, communication radio etc in heavy trucks. Most of them (at least those using switch mode technology) will easily cope with a 36 V input as they must withstand the voltage surges that might be caused by the alternator in the truck's electrical system. Just make sure that electrolytic capacitors etc in the input circuitry have at least 40 V of working voltage.
Those units are easy to find at car breaking yards dealing with heavy vehicles.

Regarding the headlights, an economical approach would be connecting the lamp filaments and a ballast resistor in series to add up to 36 V nominal voltage. Remember that headlight lamps marked "12 V" are in fact made for 12,8 V or 13,2 V nominal voltage.


I considered just drop a resitor in place but... When I say 36 volt that is a noiminal rating. With a full charge and no power drain the battery voltage is closer to 40vdc. Under full load, (going up hill) the voltage may drop as low as 30 vdc.
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RODALCO



Joined: 28 Oct 2006
Posts: 30
Location: Auckland - New Zealand

PostPosted: Sat Aug 18, 2007 7:55 am    Post subject: Reply with quote

Instead of waisting your power into a resistor you may as well put 3 x 12 Volts lamps in series. You get 3 times the amount of light and can aim it in different directions too.

Ok, you have to put the first two lamps on insulated brackets or alter the wiring so that no ground short can occur.
The wattage of the lamps must be the same too for equal voltage shareing.

For the stereo radio, add a suitable zener / power transistor (2N3055) regulator in series to get your 12 volt supply.
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PostPosted: Fri Aug 24, 2007 2:49 pm    Post subject: Reply with quote

USE LEDS with 30v you can serialize up to 10,12 LEDS and that will give you more light then 3 12 voltsw car bulbs. If you resesearch you can find blue green white above 10000 lumes each and that is bright . for your radio just hang in there a lm317 regulator they are good for 1.4amps your radio will happy with that. finaly don't forget to limit the current though your LEDS to the specs usualy 15 to 300 ma actualy must design for the max power of the device and be safe. you will not need 10 to see the course
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