Running BJB holders above the 3A / 150V rating?

[Joe34]

BJB Data sheet : https://www.bjb.com/index.php?pid=397936&lid=4

The BJB 47.319.2033.50 is compatible with the CLU048 Series along with some others.
However im planning to run in series 5 cobs per HLG-240-C1400 driver at 36v 1350mA, = 6.75A.

Should this be avoided?

I am assuming that a significant amount of builds would require >3A / 150V...

 

[nogod_]

With that driver you will be wiring in parralel not series.

If you are running them each at 1350ma then that is well under the 6.75a limit.

You are only planning for the amperage pushed through each cob because amperage doesnt stack in a parralel circuit like voltage does in a series circuit.

Edit: what cobby said, you cant fuck this one up even if you try.

BJB Data sheet : https://www.bjb.com/index.php?pid=397936&lid=4

The BJB 47.319.2033.50 is compatible with the CLU048 Series along with some others.
However im planning to run in series 5 cobs per HLG-240-36B driver at 36v 1350mA, = 6.75A.

Should this be avoided?

I am assuming that a significant amount of builds would require >3A / 150V...

 

[CobKits]

In short: exceed the mfg specs at your own risks, in your case you will not be exceeding the mfg specs unless every cob in your circuit blows, save one.

Driver has a hard cap of 36V and cant drive a CLU048 over ~1400 mA in any situation

 

[Joe34]

@nogod_ I quoted wrong driver, corrected it now. So I guess you would advise not to go against the ratings... hmmm

Edit : However regarding those HLG-240-36B drivers, the spec states they are Constant Voltage + Constand Current, does that not mean we can choose how to wire them?

HLG-240-36B Data sheet : http://www.mouser.com/ds/2/260/HLG-240H-SPEC-805975.pdf

 

[nogod_]

Yeah what i said before, amps dont stack in a series circuit so youre only pushing 1400ma through the holders, not 6.75a

@nogod_ I quoted wrong driver, corrected it now. So I guess you would advise not to go against the ratings... hmmm

 

[Joe34]

Yeah what i said before, amps dont stack in a series circuit so youre only pushing 1400ma through the holders, not 6.75a

But doesn't the voltage stack to 180V?

 

[nogod_]

Yes that is the drawback of the bjb holders and wiring in series.

The constant voltage/ constant current driver you linked requires that you wire in parralel which does open you up to thermal runaway if one of the cobs draws a higher voltage than the others.

Sorry thats all i can say for today...gotta keep my post count down

But doesn't the voltage stack to 180V?

 

[Joe34]

Hmm, il have to search for some builds using these BJB's to see if anybody is going over the limit rating...

 

[Boatguy]

But doesn't the voltage stack to 180V?

Volts dont matter as much as amps. 300v at 1.5 amps is basically the same as 150v at 3 amps.
That is a maximum rating of the holder, so you are safe if you keep it under 450 watts.

 

[Joe34]

@Boatguy
Thanks, My build should end up around 250w each driver

 

[Boatguy]

@Boatguy
Thanks, My build should end up around 250w each driver

Thats well within the specs.
Chances are thats not even a maximum rating but a nominal. Either way you are way under.

 

[Joe34]

@Boatguy yea, I thought maybe that its not the minimum-max rating

 

[Boatguy]

@nogod_ I quoted wrong driver, corrected it now. So I guess you would advise not to go against the ratings... hmmm

Edit : However regarding those HLG-240-36B drivers, the spec states they are Constant Voltage + Constand Current, does that not mean we can choose how to wire them?

HLG-240-36B Data sheet : http://www.mouser.com/ds/2/260/HLG-240H-SPEC-805975.pdf

Did you mean to link this driver. Earlier you said http://www.mouser.com/ds/2/260/HLG-240H-C-spec-806189.pdf which is the right one.
http://www.mouser.com/ds/2/260/HLG-240H-SPEC-805975.pdf is wrong

 

[Joe34]

@Boatguy

No, after I edited my post I asked an additional question re the 240-36B driver, which was that the datasheet for the 240-36b header read "Constant current + Constant voltage", so did that mean that that driver can be used for either setup, which was why I linked to that driver.

I still didnt get an answer for that Q though.

 

[CobKits]

its constant current when pushed to the max... then voltage drops. look at the curve in the datasheet

 

[topcat]

What's the trick to release the wire from the holder? I've tried poking a paper clip in the holes and no luck. Is there a technique to it?

 

[CobKits]

What's the trick to release the wire from the holder?

buy a new holder

 

[topcat]

I just flipped it with the wires connected.

 

[MAJOR GANJAH]

With that driver you will be wiring in parralel not series.

If you are running them each at 1350ma then that is well under the 6.75a limit.

You are only planning for the amperage pushed through each cob because amperage doesnt stack in a parralel circuit like voltage does in a series circuit.

Edit: what cobby said, you cant fuck this one up even if you try.

The HLG-240H-C1400 is a constant current driver with minimum output voltage of 89V, which means in a parallel circuit each chip would be under 89V of tension at least, way above the optimal voltage for running them. If you put them on series they will be supplied with about 36V and 1.4A current on each chip, which means that each holder will be subject to this exact tension. The only object in this circuit which will be subject to the 179V tension will be the driver. You have to think of this circuit as a river, each chip is a 36V waterfall, and the driver is a pump raising the water all the way back to 179V lake. Between each chip with the same exact electrical properties (i.e resistance) the fall will be always 36V steep, the only point that connects to the extremes is the driver.

 

[CobKits]

Volts dont matter as much as amps. 300v at 1.5 amps is basically the same as 150v at 3 amps.

well sort of.

high voltage can arc easier. think about lightning, or a spark plug