looking for a 3a 3v led driver 60v input

izeman

izeman

1 GW
Joined
Jun 21, 2011
Messages
5,131
Location
Vienna, Austria
i'm looking to drive a 10w cree xm-l led from my main pack. 12s lipo - 44v 50v hoc.
my last bike was 24s, so i could use a regular wall power supply to bring 90v down to 5v, and feed this to the already installed led driver.
so now i need something with as few parts as possible to connect the lamp to my battery.

this is the lamp (quite popular here, and i love them. bright light, low price)

led%20lamp.JPG


i guess bringing those 50v down to 5v, and then feed it to the driver installed in the bike lamp itself would be easier, than finding a 3a constant current 3v bucket driver that feeds the led directly and is driven by 50v. correct?
 
Just so I understand..are you looking for a LED driver circuit or just a power supply (DC-DC dropper)

The lamp will have the driver circuitry built in..or are you stripping out the original driver setup from the innards of the lap and wanting to build your own?

If so I suggest the CandlePower forums are the best place to ask
 
both :) which ever is better / easier / cheaper / cleaner ...
i know that i need a constant current ps to drive the led. but it's not easy to find one thst accepts over 30/40v input and outputs 3v for a single led. most of them are household voltage 110/220v or 12v input and 12v output.
maybe it's the easiest way to use a small dc/dc ps with 5v output and feed the led's internal driver.
 
yse, certainly easier..but as you say not neater

i'd head over to the candle power forums

http://www.candlepowerforums.com/vb/content.php
 
izeman said:
sure. i'm already registered there. some really scary light addicts there. just as i love it :)
Click to expand...
no. i was wrong. i was thinking of another forum.
great forum ... you have to register to search ... done ... no you need 3 posts before you can SEARCH ... how stupid is that??? ... i have to click through different posts to find a possible answer to my question? ... post in the introduction forum are NOT counted as posts ... first 3 posts are moderated and only after those have been qualified as valid you are allowed to SEARCH ??? ... f*** it.
man i HATE ppl who think they need to educate you. :(
i'll use google to search the forum and delete my registration.
 
I've changed my mind about that CPF forum too. The mods and rules there make living under martial law seem slack.

See threads like this
http://budgetlightforum.com/node/15377

I've already been threatened with being banned because I was asking about bright off road lights for a powerful e-bike. I mentioned it was fast, so I was threatened with being banned for mentioning illegal activity and trying to promote more illegal activity by asking about bright bike lights

I think most of us on here would all be banned within a week on there.

We could do with an LED -lighting tech sub forum here on ES, so we can avoid the analy retentive over at CPF.
 
yep. they are just plain stupid. ES is the best example to show that with minimal administration you can still run a great forum with great ppl sharing their knowledge.
btw: i today received this dc-dc converter: it's 5v and 5a and not 3v/3a, but it's good to feed those usb powered magicshine clones.
http://www.aliexpress.com/item/DC-DC-Buck-Converter-36V-48V-60V-10-60V-to-5V-5A-Step-Down-Voltage-Power/1937877938.html
 
Glad to hear you say that, so it is not just me.

Who would we ask about getting a lighting su forum set up here?
 
The lamp you picture looks very similar to the myled.com bike lights

Do yours have clear rear button that changes colour red/ blue on use?

If I find the link again I'll post it, but I did find a variable voltage, constant current ( variable )board on e-bay. Otherwise search for Mountain Electronics or Intwrnational Outdoor, they both sell LED driver boards of multiple types.
Edit , saved you the bother

http://intl-outdoor.com

http://www.mtnelectronics.com
 
NeilP said:
Glad to hear you say that, so it is not just me.

Who would we ask about getting a lighting su forum set up here?
Click to expand...

Ypedal would be a good mod to begin the process, me thinks? Sounds like a very good idea in the EV technical forum.
 
NeilP said:
The lamp you picture looks very similar to the myled.com bike lights
Do yours have clear rear button that changes colour red/ blue on use?
Click to expand...
i have at least 7 of these lamps. quality seems to become worse over time (as they get cheaper that is).
the all have a clear rubber button with a colored led inside. color varies green/red/blue. and light intensity varies as well.
going with the 5v dc/dc converter is chose simplicity over efficiency. that way i can connect the lamps to the converter (which is powerful enough to feed two of them hi/lo beam) and use the internal led driver.
 
I was thinking you could drive that from your voltage dropper so get accurate constant current as that is what that unit will do.
In super market now. Will scan my other links when I am home
 
Your comment been running through my mind.

That unit is variable output, 5A is just the max.
It has two pots to set both max output current and voltage

Still need a dropper from your pack voltage but then you could junk the built in drivers and drive the crees a little harder if you wanted.
 
The best forum for bike lighting that I've come across is on the mtbr forums, in particular the DIY lighting forum.

I have my homemade light that runs two XM-Ls in series, so requiring about 6.6V 3A. The driver itself is a TaskLED LFlex, a linear driver that burns off excess voltage as heat. That's fine from my 7.2V lighting pack but no good at all from the 36V battery I'll be using on an ebike. I've bought a battery eliminator circuit from Hobbyking for the job - it has a selectable output voltage which I can set at 7V and just plug my lights straight in. Current handling is 20A, so will happily cope with my 3A requirement, and input voltage is from 2 to 12S cells so would cope with your battery pack too. You will still need to use the driver in the light to limit the drive current of course.

Michael
 
Might be useful for my girlfriends bike, but not for this thread OP's request as he needs 60 volt input. So close but yet to far
 
NeilP said:
Might be useful for my girlfriends bike, but not for this thread OP's request as he needs 60 volt input. So close but yet to far
Click to expand...
It's actually 50V max he needs, 12S which that unit will do. It is the max though - it won't do any more. Michael
 
Well 12s is 50 volt, yes, but in his thread title he specified 60.

No idea why but maybe he was planning to run 14s in future and wanted to future proof?
Just answering in relation to what he asked for without assuming anything else.
 
I'd go with that e-bay item I linked to earlier, , but finding the dropper is still the issue.

Meanwell do an item that suits your requirements...

http://www.mouser.com/ds/2/260/NSD05-S-spec-53378.pdf

you could try driving the LED direct with one of these : NSD05-48S3 but that only give 1.2 amp out, A cree XM-L can take up to 3 amps as you obviously know,

I doubt if the original driver built in to the lamp gives 3 amps out ..it may take that on the input side..but have you measured the output current in to the LED from the original driver?


So I'd go for the NSD05-48S5 with a 5 volt output or the next one up at the 12 volt output. Then a custom driver, like the e-bay one, where you can adjust the exact output current..or a ready built driver from the likes of Fast Tech or Mountain Electronics.

If you were to use

http://www.ebay.com/itm/201059502388

you could remove the current limit potentiometer, and replace with switched fixed resistors, so you could then switch resistors , to give low , high , and super high, turbo mode...for one some &^&E$% blinds you .
 
http://www.meanwell.com/webapp/product/search.aspx?prod=ska60


many other DC-dc convertors on meanwell

http://www.meanwell.com/webnet/search/seriessearch.html
 
A Battery Eliminator Circuit is a DC-DC converter, one designed to operate when powered by batteries in a reasonably harsh environment (model aircraft) and to provide high output current (for driving the servos). The one linked to will work on your stated battery pack of 12S, is small and doesn't require fan cooling and as a bonus it is cost-effective too. If you set the voltage output to 7V you would basically be emulating the battery pack that came with your light, so you would simply plug in your light to the BEC output and use the light's internal LED driver to manage the current and light modes. Exactly the same as your thought of using the 5V 5A DC-DC converter but the BEC has a selectable voltage output and 20A current handling, and is available from stock in the UK.

Michael
 
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