Power Source recommendation for LDD setup

[oscarinw]

Hi folks!

This is the rig I'm looking at moving over to LDDs:

1 Mean Well LDD-1500L dimmable driver (Tot load = 28.5V)
10 x RB: CREE XT-E Royal Blue LED (450-465nm) - Forward voltage 2.85V - 1,500mA. Total est. voltage = 28.5volts

1 Mean Well LDD-1500L dimmable driver (Tot load = 28.5V)
10 x RB: CREE XT-E Royal Blue LED (450-465nm) - Forward voltage 2.85V - 1,500mA. Total est. voltage = 28.5volts


1 Mean Well LDD-1000H dimmable driver (Tot load = 18.6V)
6 x B: CREE XP-E Blue 3W LED (465-485nm) - Forward voltage 3.1 - 1,000mA. Total est. voltage = 18.6

1 Mean Well LDD-1000H dimmable driver (Tot load = 37.8V)
8 x CW: CREE XP-G2 Cool White LED (~6000K) - Forward voltage 3.1 - 1,500mA. Total est. voltage = 24.8volts
4 x WW:CREE XP-G Warm White LED (2,600-3,700K) - Forward voltage 3.25 - 1,500mA. Total est. voltage = 13volts

1 Mean Well LDD-700H dimmable driver (Tot load = 26.1V)
6 x UV: SemiLEDs UV LED (410-420nm) - Forward voltage 3.5 - 700mA. Total est. voltage = 21.5volts
2 x RE: CREE XP-E Red LED (620-630nm)- Forward voltage 2.3 - 700mA. Total est. voltage = 4.6volts

1 Mean Well LDD-300H dimmable driver (Tot load = 6.6V)
2 x GR: CREE XP-E Green 3W LED (520-535nm) - Forward voltage - 3.3 - 350mA. Total est. voltage = 6.6volts

System total load = 146.1V

I need a recommendation on a power supply or even better, how do I calculate the specifications I need for a PSU?

I appreciate your help!

 

[oreo57]

System total load = 146.1V

I need a recommendation on a power supply or even better, how do I calculate the specifications I need for a PSU?

I appreciate your help!

first that V is wrong..Watts (or amps ) add in parallel. Voltage adds in series....

Just use the highest V(f) and add 3V.. That is the voltage needed. In your case..37.8 + 3 = 40.8

As to capacity you should calculate the actual Watts but w/ out the exact V(f) @ a you can just use the total of all LDD's..6W x at least 10% so 6.6W

Example:
http://www.onlinecomponents.com/mean-well-se60048.html?p=11953314&ref=Nextag.com

you do know that you put these all in one series string?
mixing voltages in series is ok..

1 Mean Well LDD-1000H dimmable driver (Tot load = 37.8V)
8 x CW: CREE XP-G2 Cool White LED (~6000K) - Forward voltage 3.1 - 1,500mA. Total est. voltage = 24.8volts
4 x WW:CREE XP-G Warm White LED (2,600-3,700K) - Forward voltage 3.25 - 1,500mA. Total est. voltage = 13volts

 

[nbinc]

oreo57 is true - you would have to be a total power consumption rather than voltage.
Voltage parameter is required to select the proper power supply voltage (12V, 24V, 36V, 48V)

Approximately calculate how much of each LED power consumption can be calculated by multiplying the forward voltage of the amps.
For example: Forward voltage 2.85V - 1,500mA. LED power consumption is 4.275 W, if you have 10 LEDs then their total power consumption is 42,75W

They led you enter Forward voltage 3.1 - 1,500mA, but use them with LDD-1000 (1000mA), remains to be seen what the specification LED LED is at Forward voltage at 1000mA, it is usually slightly lower than as at 1500mA

1 Mean Well LDD-1500L dimmable driver (Tot load = 28.5V)
4.275x10 = 42,75W

1 Mean Well LDD-1500L dimmable driver (Tot load = 28.5V)
4.275x10 = 42,75W

1 Mean Well LDD-1000H dimmable driver (Tot load = 18.6V)
3.1x6 = 18,6W

1 Mean Well LDD-1000H dimmable driver (Tot load = 37.8V)
4,65x8 = 37,2W and 4.875x4 = 19,5W
total for driver = 56,7W (power for 1500mA, need to correct Forward voltage data for 1000mA) !!!!

1 Mean Well LDD-700H dimmable driver (Tot load = 26.1V)
2,45x6 = 14,7W and 1.61x2 = 3.22W
total for driver = 17,92W

1 Mean Well LDD-300H dimmable driver (Tot load = 6.6V)
1.115x2 = 2,31 W (power for 350mA, need to correct Forward voltage data for 300mA) !!!!

Maximum probably 181.03W
Add some watts for LDD driver itself and some errors in the calculation of the power LED

I think best power supply is 48V and 220W-250W, for example desktop switching power supply GS220A by Meanwell.

 

[perkint]

That figure for XTE fV is wrong. More like 3.3V at 1500mA. Probably still lower than the XPG/XPG2 string (why use XPGs and not all XPG2? And why drive them at 1A and the XTEs at 1.5A?) so shouldn't alter things much.

Tim

 

[oreo57]

As to capacity you should calculate the actual Watts but w/ out the exact V(f) @ a you can just use the total of all LDD's..6W x at least 10% so 6.6W

Example:
http://www.onlinecomponents.com/mean-well-se60048.html?p=11953314&ref=Nextag.com

embarrassing correction 6 AMPS 6.6AMPS.. but as pointed out this is a bit incorrect, but errors are on the high side of needed Wattage.. long week already..
The ps link is still valid though a bit of overkill. Nice thing is it has a fairly high range of voltage adjustment..
43-56V.. allowing an increase in string length..

AC/DC Power Supply Single-OUT 48V 12.5A 600W 11-Pin

 

[oscarinw]

Thanks kindly to all 3 of you.

why use XPGs and not all XPG2?

This is the setup I already have so not buying any new LEDs.

And why drive them at 1A and the XTEs at 1.5A?

Good point. Would this change my power requirements or does the already suggested work with 1.5A drivers on this string?

Sorry about the newbness. I truly appreciate your guys' help!

 

[oscarinw]

Oh and another question:

Do the 1.5A (L model) LDDs get rigged exactly the same as the 1.0 (H model)?

 

[in2infinity]

Oh and another question:

Do the 1.5A (L model) LDDs get rigged exactly the same as the 1.0 (H model)?

Keep in mind that you are mixing H and L drivers so you either...

1.) Keep your power supply under the Max voltage for the lowest driver. In this case, L drivers cannot get more then 36V so your power supply should not output more then 36 volts to this system.
2.) Use a voltage regulator or other mechanism to limit voltage to <=36 Volts to the L drivers
3.) Use 2 power supplies if you want to drive the H drivers above the L driver voltage.

The L and H drivers have different pins which I assume is to prevent you from mixing them accidentally because of the voltage differences. They work the same, but the PWM pin on the L's are 4 pins from the furthest position (pin 21), while the H's are 3 pins (pin 22) (see datasheet).

I've designed a circuit board that takes both and has micro switches that allows you to gang multiple drivers together to run off of 1 PWM pin - and you can daisy chain multiple boards to build large arrays. The drivers just snap into 24 pin sockets and you connect your microcontroller using standard male headers/wires.

This has all been tested and I've had setups running mixed LDD-L/LDD-H arrays but... you still have to limit voltage to the drivers with the lowest voltage rating.

Looking at the sum of what you're attempting to do I would run them all sub 30 volts, split the chains to keep it under that voltage and tie the PWMs together of the chains you want to control together. The main one to look it is this one...

1 Mean Well LDD-1000H dimmable driver (Tot load = 37.8V)
8 x CW: CREE XP-G2 Cool White LED (~6000K) - Forward voltage 3.1 - 1,500mA. Total est. voltage = 24.8volts
4 x WW:CREE XP-G Warm White LED (2,600-3,700K) - Forward voltage 3.25 - 1,500mA. Total est. voltage = 13volts

LDD-H drivers are not available in 1500 mA - only the L drivers are so if you want to drive these at 1500 mA then you'll need to go to the L driver and split this into 2 chains. The lower power H's (>700 mA) have the same form factor as the the high power L's - the low power L's are completely different so I would stick with the H drivers sub 1000mA just to keep things simple.

 

[oreo57]

Keep in mind that you are mixing H and L drivers so you either...

1.) Keep your power supply under the Max voltage for the lowest driver. In this case, L drivers cannot get more then 36V so your power supply should not output more then 36 volts to this system.
2.) Use a voltage regulator or other mechanism to limit voltage to <=36 Volts to the L drivers
3.) Use 2 power supplies if you want to drive the H drivers above the L driver voltage.


I've designed a circuit board that takes both and has micro switches that allows you to gang multiple drivers together to run off of 1 PWM pin - and you can daisy chain multiple boards to build large arrays. The drivers just snap into 24 pin sockets and you connect your microcontroller using standard male headers/wires.

This has all been tested and I've had setups running mixed LDD-L/LDD-H arrays but... you still have to limit voltage to the drivers with the lowest voltage rating.

Opp's I did forget about that.. And thanks for the "workarounds"..

Personally i'd just under drive by using more ldd-h's.. maybe add a few more diodes..

then again, there is only one problematic channel w/ a 36V PS..

1 Mean Well LDD-1000H dimmable driver (Tot load = 37.8V)
4,65x8 = 37,2W and 4.875x4 = 19,5W
total for driver = 56,7W (power for 1500mA, need to correct Forward voltage data for 1000mA) !!!!

Use a 1500 ldd-l and spit to a series/parallel arrangement.. cutting the v(f) in half, at the expense of going from 1000mA to 750mA..

Or just split and add another ldd-h(or l) to this channel, tying the pwm together..only adds $7 to the build.. certainly cheaper than a dual ps and about the same as a Chinese buck voltage regulator..

 

[oscarinw]

Or just split and add another ldd-h(or l) to this channel, tying the pwm together.

Does this mean to connect 2 strings (LDDs) to one PWM? Because I only have 6 channels on the dimming board. I have the Reef Angel and planning to use their dimming expansion.

Thanks again!

 

[perkint]

Yeah - one PWM signal can be split to control multiple LDDs

Tim