Splitting an HLG 185h-c1400

Airwalker16 · Nov 20, 2018

If there were some PCBs I had that were 24-36V and wanted to run them at 700MA. They cannot be ran any higher. Wouldn't I be able to run 6 of them, 2 parallel rows of 3 in series hitting at the very min 72v and at Max 108v, which hits the min 71V needed to run the driver?
It wouldn't be super efficient obviously,
But could be done?

Also, you can actually run just 3 CXB3070s on the same HLG-185H-c1400 driver I think, ya? The 108 they add up to in voltage is still within the range, right?

79Toaster · Nov 20, 2018

What kind of pcbs? 3x 3070 would not exceed drivers max V.

Airwalker16 · Nov 20, 2018

79Toaster said:
What kind of pcbs? 3x 3070 would not exceed drivers max V.

Of course not. They run 4 cxb3070's very well. But they could also run just 3, right?

They're circular PCBs with xpe reds, blues, and whites. 24-36v because the different diodes can vary in Forward voltage depending on current and it adds up amongst all 15 of them.
Even this driver running them splits the 1500mA current into 750 by running 2 in parallel.

79Toaster · Nov 20, 2018

Airwalker16 said:
Of course not. They run 4 cxb3070's very well. But they could also run just 3, right?

They're circular PCBs with xpe reds, blues, and whites. 24-36v because the different diodes can vary in Forward voltage depending on current and it adds up amongst all 15 of them.
Even this driver running them splits the 1500mA current into 750 by running 2 in parallel.
View attachment 4236416 View attachment 4236417

Yes, simply wire them 3S2P and the driver will adjust the voltage accordingly. That's the point of using constant current driver.

Airwalker16 · Nov 20, 2018

79Toaster said:
Yes, simply wire them 3S2P and the driver will adjust the voltage accordingly. That's the point of using constant current driver.

So that would imply that the 3 cobs would also work on the same driver.

79Toaster · Nov 20, 2018

Airwalker16 said:
So that would imply that the 3 cobs would also work on the same driver.

If they can take the current, yes. It says on the driver what's the output voltage range is and in this range the driver will supply the constant current it's designed for. If the voltage demand is higher than from. The drivers max output voltage then the load will simply pull less current as it's not gonna get enough voltage. For example, I have 2 CXB3070 wired in series on a meanwell LPC 150-C2100. Max voltage of the driver is 72V so in theory should run those cobs at 75W. But at 2100mA 3070 will need more than 36V wich means two of them in series would need 72V+, probably more than 73V, would have to check the datasheet for almost exact number. So the driver tops out at 72V and 3070's only pull 1900mA, because they don't need 2100mA at that voltage. And as they slowly warm up the Vf drops a fragment and they pull even less current. In this case 3590 would run at full 75W as it has slightly lower Vf at that current and would match the driver perfectly.

Airwalker16 · Nov 20, 2018

79Toaster said:
If they can take the current, yes. It says on the driver what's the output voltage range is and in this range the driver will supply the constant current it's designed for. If the voltage demand is higher than from. The drivers max output voltage then the load will simply pull less current as it's not gonna get enough voltage. For example, I have 2 CXB3070 wired in series on a meanwell LPC 150-C2100. Max voltage of the driver is 72V so in theory should run those cobs at 75W. But at 2100mA 3070 will need more than 36V wich means two of them in series would need 72V+, probably more than 73V, would have to check the datasheet for almost exact number. So the driver tops out at 72V and 3070's only pull 1900mA, because they don't need 2100mA at that voltage. And as they slowly warm up the Vf drops a fragment and they pull even less current. In this case 3590 would run at full 75W as it has slightly lower Vf at that current and would match the driver perfectly.

But I'm just saying, its not detrimental or wrong to run these drivers at the low end of their voltage requirement?

79Toaster · Nov 20, 2018

Airwalker16 said:
But I'm just saying, its not detrimental or wrong to run these drivers at the low end of their voltage requirement?

Not at all, they just get less efficient. I have a hlg 120h-c1050b running at 146W and 93% efficiency, wich is 157W out the wall.

My LPCs are probably running somewhere down the '80s (pun intended)

Splitting an HLG 185h-c1400

Airwalker16

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