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Create light for high-speed shooting 1500w
SergeyKashin:
He started developing his own light for high-speed video shooting. I finally got my LED (1500w 36v, $550) and a radiator for cooling ($200). Now the task is to combine all this to find a pwm with high khz for dimming and develop a complete system for cooling this LED.
Nikon1:
I also planed out a complete Power supply system for one of those once, but never got around building one, only know those 1200W chips for far over 1k€, and then there is also shipping and Taxes additionally, so way too expensive to be worth it. 550$ on the other hand is a entirely different story. can you link where you got your Chip and Block from?
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I planed on using 6 of those, one for every one of the sections of the LED. Those can be dimmed by adding an External Potentiometer and replacing the one on the board with the External one. Feed with Two Powerfull 12V PC-Powersupplies or one beefy server one (propably still a good idea using two even from the Server ones, as this whole thing will draw way more than 1200W, cause the Converters also have Losses, so have at least 1500W of 12V-Power Ready, or closer to 2000W total if you end up going with cheap No-Brand China Power-Supplies).
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https://www.ebay.de/itm/400W-15A-DC-Step-up-Constant-Current-Power-Supply-LED-Driver-Boost-Converter/273562739111?hash=item3fb19c21a7:g:29QAAOSwjMtb7l~b .
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#EDIT#: Any Plans on the Radiators yet?
SergeyKashin:
I think it is better to immediately take a 36 volt power supply than to use additional step-up converters. There will be less unnecessary wires. I found a couple of pieces in my city for 36 volts 3000 watts of bu, for about $ 200
I talked to those who use similar LEDs, but they bought more expensive. For cooling, they use chillers
I considered buying a chiller in my city, but they are industrial and large, and these are not very suitable for the home. So I think to try a couple of circuits from the radiator from the computer with water cooling for 4-5 coolers 120mm
If you are interested in buying such an LED, then I plan to order a second one for myself, but there you need to order a batch of 20 pieces. If there are so many people, then perhaps they will make it a little cheaper by 20-50 dollars
With delivery and taxes I think there will be no problems
Nikon1:
ok, directly using a 36V PSU can also Work, but make sure to use some Kind of current Limiter. Those big LED-Chips actually dont care that much about Voltage as they do about current. Each one of the 6 Chanels this Chip has needs exact current to Specification on the Datasheet, if you feed them Fixed Voltage from a big PSU, some or even all of the Chanels can draw more than they should, and that will dramatically lower livespan of the Chip. i think going over by 5-10% in current allready lowers Livespan by a lot. So you need a Dedicated Current Limiting Circut for every one anyways. Nice Thing about those Voltage Boost-Converters i linked is, that they allready have built-in adjustable Current-Limiting. So you can Set every one of those 6 Drivers to the Current your LED Needs (or go 1 to 2% under for Extended Livespan), and use The Voltage control Potentiometer as A dimmer Function. You can Try using the 36V PSU directly, but i personally would be afraid to Damage such a Expensive Chip or lower the Livespan by doing that. If you actually end up doing that, i would at least reccomend you to power each one of the 6 chanels up individually with that PSU and measuring the Current it actually draws, and if its over specified Current, adding a (powerfull enough) Resistor of correct Value in between that chanel and the PSU to make sure, none of the Chanels draws to much and will fail soon because of that.
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So thats what i would do at least, yours may also work just fine, but i designed mine to work 300% Sure and Really Long term, so i figued a propper Current Limiting Circut would be needed, and because just Heating it away with a Clasic Linear Current Limiting Circut would not only be rather wastefull, but would also create impressive amounts of heat for the kind of Load its supposed to drive, i figured those Step-Up-Driver Boards would be easiest solution.
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However, if you can get your entire Power Supply Stage done with a single unit and 200$, that has its point of relevance. Still would make sure to at least check the Current, cause its not usually best practice to just put LEDs of any kind in paralell without some kind of current Limiting, even be it done by some Resistors.
SergeyKashin:
For adjustment, I will look for pwm, at the moment I found only 1000 watts of power, but I need it to be able to adjust 2000 watts. Also a very important indicator is the refresh rate (Khz) it should be 150 and higher. Therefore, a conventional potentiometer will not work, you need a complete integrated circuit for power adjustment
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