Is that a good idea ?

[romroro]

Hello I'm currently do some experiments with cree. And due to my drivers I would like do a "non traditional" design for high current.

Do you think that is possible ? for me that depend of galvanic isolation inside drivers. What is your opinion ?

Tks Romroro

Ps: sorry for my English ... you know I'm french

 

[Gunner12]

I don't understand this stuff but I have a feeling that it won't work.

What are you trying to do? It seems as if you want to have a higher voltage to drive 3 LEDs. There are some single drivers that would do that.

What is your battery voltage and what current do you want to drive the LEDs at?

:welcome:

 

[romroro]

With this design my objective is to add output drivers current with a 12V battery, for me it will don't work but it depands of internal design of drivers.

Maybe someone know the exact answer

 

[romroro]

The fist objective is to use own drivers

( tks for the welcome !! )

 

[Gunner12]

You want to use your own drivers? Or do you want to make your own drivers. Either one could be difficult if you are new to that area(You might be an expert on drivers for all I know but since I don't know, I have to presume you are new to this).

Well, 12v source, about 3.6v input per LED, so that would mean you'll need a buck driver. One that lowers a higher voltage of the source to the right voltage the LED needs. This driver is out of stock right now but it should work for this task.

 

[jtr1962]

It looks like what you are trying to do is parallel several buck drivers to increase the current capability beyond that of a single driver. If so, your connections are wrong. You would need to connect the two cathode outputs and two anode outputs together. Even doing this, it may or may not work depending upon the design of the drivers. Best idea is to just get a buck driver capable of delivering the current you wish to drive the LEDs with.

And if you're trying to boost voltage then what you're doing definitely won't work unless you have drivers with floating (i.e. transformer-based) outputs.

 

[Gunner12]

With some drivers, you can also change the resistor value to get more or less current.

 

[worldedit]

Measure the resistance between output and input wires of the drivers. If there is any connection it wont work. Wiring them in series will short something. Most drivers i got have direct connection between +battery and +LED.

 

[romroro]

"own" drivers wasn't the good term ( another time sorry for my english) i should use "already bought drivers".

Thanks you for your answers I will study worldedit idea, I thinks is good idea for check isolation.
In case off impossibility (what is probable) I will look at mod my drivers like Gunner12 proposition.

I hope show you picture off my prototype later.

:thumbsup:

 

[frenzee]

As jtr1962 stated, this absolutely will not work, unless your drivers (buck or boost) have a completely isolated, transformer-based secondary circuit, which is very rare nowadays. There are many reasons, not the least of which is that the + supply of one of your drivers is connected directly to the ground on the second unit. That, my firend, is a short circuit, plain and simple.

 

[saabluster]

Maybe this will help you out.

 

[romroro]

Tks all for your help, il will use 2 drivers in paralell ( 1 for 2 leds and the second for 1 ). Maybe after some tests, I will mod my drivers for higher current).

Let's game begin