DC-DC Converters

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BrandonB
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DC-DC Converters

Post by BrandonB » Jan 26, 2010 6:46 pm

http://stores.ebay.com/Renton-Company-LLC

This guy has DC converters for many different voltages for good prices. In particular this 33-72V to 12/12/3.3V C&D converter:

http://cgi.ebay.com/DC-to-DC-Converter- ... 562cd584b3

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Kingfish
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Re: DC-DC Converters

Post by Kingfish » Mar 08, 2010 1:06 pm

This was a great find; Thanks BrandonB!
Adding the datasheets for those into collecting such little things...

~KF
Attachments
VKP60MT312.pdf
VKP60MTXXX datasheet
(832.44 KiB) Downloaded 317 times
VKP60MT312-app-notes.pdf
VKP60MTXXX app notes
(83.9 KiB) Downloaded 225 times
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The hands acquire shakes, the shakes become a warning.
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Re: DC-DC Converters

Post by Kingfish » Mar 09, 2010 12:21 pm

Heat Sink Addendum:
I have contacted the seller and they do not sell mating heat sinks. The issue is that the proscribed sinks in the spec have non-standard mounting rectangles: A typical 50mm x 47/48mm (2.0” x 1.9”) mounting does not map to a direct fit without modification or slotting.

One needs to find a half-brick heat sink that has a mounting rectangle of 52mm x 54.6mm (2.05” x 2.15”) or other alternate solution, likely a custom design.

This is probably not a big issue if the current draw is low and/or operating in cool climes.
* My 2WD Garden Wall
* Kinaye MotorSports
* Primary ride: 2WD Disc 9C 2806-equiv / Dual Lyen 12FET / 20S7P LiPo.
* Epics: Going to California: 2011 8)
* 50-mph, 101, 10k-Club. 12,527 miles-to-date, 7037 as 2WD.

It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed.
The hands acquire shakes, the shakes become a warning.
It is by caffeine alone I set my mind in motion.

majucamex2010
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Re: DC-DC Converters

Post by majucamex2010 » Aug 22, 2010 4:50 pm

I sell cheap but very reliable Dc-Dc converters (48V dc to 12V dc) having a 12V dc entry you can use or adapt by yourself almost any gadget.
I did the converter in order to put blinking lights to my Trunk Trail (it had only reflective material but not lights) now I have added to my trail a more fancy and expensive look, but overall a lot of safety to me (blinking lights are more visible to car drivers).

If you are interested please call me 15 dollars plus delivery at your choice.

maurojuar@yahoo.com

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Re: DC-DC Converters

Post by Rassy » Aug 22, 2010 5:40 pm

I have used these. They convert 48V to 12V 10 Amp. Cost is about $20 plus shipping. They are standard equipment on Chinese scooters and used to run lights, etc.

http://www.partsforscooters.com/All-Par ... =converter
-Rassy-
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Re: DC-DC Converters

Post by ejonesss » May 20, 2013 9:48 pm

seeing the price of the 12 to 48 volt 5 amp step up converter it would be cheaper just to buy 8 48 to 12 3 amp step down converters and make a 4s2p and have 48 volts at 6 amp.

the thing is i am not sure if the outputs can be seriesed and paralleled.
stuff for Even Newer 4 to 24-cell Battery Management System (BMS)
32 lifepo4 cells 16s2p 40138 green cells √
16s2p 40138 based pack built assembled (building electrical equiv to $2000 eonyx system.*

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Re: DC-DC Converters

Post by Kingfish » May 21, 2013 12:39 am

My gawd man - think/be monolithic ! Reduce the part count. Do it in one :wink:

If you need more current - perhaps you need a larger circuit.

And for the record, mine still operates, answering all bells and whistles gladly without a hiccup.

Best early-on investment I ever made. In fact - I bought two.

Happy as a _ _ _ _ at high tide 8) KF
* My 2WD Garden Wall
* Kinaye MotorSports
* Primary ride: 2WD Disc 9C 2806-equiv / Dual Lyen 12FET / 20S7P LiPo.
* Epics: Going to California: 2011 8)
* 50-mph, 101, 10k-Club. 12,527 miles-to-date, 7037 as 2WD.

It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed.
The hands acquire shakes, the shakes become a warning.
It is by caffeine alone I set my mind in motion.

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Re: DC-DC Converters

Post by DVDRW » Jun 27, 2014 12:56 am

Anyone know where to get 90v to 5v switched mode low current ~200ma tiny cheapo DC-DC converter?
Id like to use it my own BMS and CA designs.
Cannot find any good schematics for diy on Google either. :roll:
There are many out there but all max ~40V and rarely max 60V

meelis11
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Re: DC-DC Converters

Post by meelis11 » Jun 27, 2014 2:41 am

Hi,
many switching-mode wall adapters actually work with lower voltage and in DC input too. (if it says 110-220V AC input, then it is possible that it works also with 90VDC)
I tested bike led lamp charger by 48VDC (just connect DC power to AC socket pins) and it worked.
DVDRW wrote:Anyone know where to get 90v to 5v switched mode low current ~200ma tiny cheapo DC-DC converter?
Id like to use it my own BMS and CA designs.
Cannot find any good schematics for diy on Google either. :roll:
There are many out there but all max ~40V and rarely max 60V

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Re: DC-DC Converters

Post by DVDRW » Jun 27, 2014 3:20 am

Ok, I give it to try. They are bit bulky tough.
I tought something like this size
To fit it my homemade CA handlebar case.
Really there is no exist higher than 60v DC-DC chips?
What about this weird design?

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Allex
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Re: DC-DC Converters

Post by Allex » Nov 13, 2014 12:27 pm

Phone chargers are usually relatively small if you want 5v:
http://ru.aliexpress.com/item/Free-ship ... 20111.html

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spinningmagnets
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Re: DC-DC Converters

Post by spinningmagnets » Mar 09, 2016 12:11 am

"Drok" brand DC /DC reducer, waterproof / fully potted, 24V - 60V input, 12V output at 10A max (120W?), $20, 6-inches by 4-inches

"golf cart" is a useful search term...

http://www.amazon.com/DROK-Waterproof-C ... B017SQ2PUG

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Re: DC-DC Converters

Post by crossbreak » Dec 13, 2017 7:10 pm

https://www.aliexpress.com/item/Dc-24v- ... 33167.html

small one, enough for a 30W DOT LED low/high beam and indicators. I use 3 units with 13s. works fine so far. There are versions with 2-5amps, I only bought the 3amp version yet.

I had bad exprience with 2596HV that are rated 55V but died at lover voltage. So I think it is best to have a headroom of ~10V to make it work flawlessly. there are cheaper units from the same vendro that are made for lower voltages, which are still within the margin though https://www.aliexpress.com/item/DC-24V- ... 7659jcgqYZ

this is too little money for the hassle to go with the cheaper unit IMO but maybe those are still worth a try

for 20s+ batteries i would go for asus eepc 12V powerupplies. They are rated for 85...240V AC but most work fine with 50V...250V DC. They are not waterproof though...but you can make them waterproof by potting them in silcone :D

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