How to drive high power LEDs
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- Опубликовано: 31 июл 2017
- In this video we look at how to drive a 10W high-power LED.
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Please watch: "Diodes: The basic building block of all digital circuits"
• Diodes: The basic buil...
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Good tips. I like really bright LEDs.
George Chambers Thanks George
Hey cool, by the way, what wave length and coating is on your pane? Thx :)
Very helpful; thank you. :)
My question is, how do you overdrive these..i.e. what waveform if we keep the duty cycles to say 5 seconds?
I'm curious why you did't use any thermal paste when you mounted the LED to the heat sink. Is that not necessary in this case?
this would certainly increase the efficiency of the heat sink module. Dry contact may be adequate in this case.
Tell you what I purchased a really high watt (2x50w) outside yard light for my parents a few years ago. It died within a year. I purchased a replacement 50w COB (only one was dead) and purchased two 20w new lights. The dead light had none, nada, zilch, TIM in it, so I smoothed out the back when I replaced the cobs then I slapped the TIM on there (I have done PC/server work for decades, so I know the value of ANY TIM). On Memorial Day I went over, and my light fix was still cranking along after now five years, BUT the two 20w units are dead (I asked and it seems they died almost the same week together). I bet you the same issue with no TIM being used only these 20w lights do not use the LED type in the video they use a bunch of individual 5050 leds encapsulated in a rubbery resin. Not sure what I will do to fix those.
Moral is use TIM or you are sacrificing so much (and make sure the Chinese put it on a smooth heatsink as mine was not).
btw, that grey stuff on it appears to be some sort of TIM though it didn't smudge with him, but was already smudged.
I have a couple of power leds. No information about the voltage needed to drive, no info on voltage drop on leds. Now what?
start at 3V 30mA and go up slowly
They seem to sell off the less well matched leds on ebay etc but still way plenty lighting power for the hobbyist!
gartmorn yes, it is a real matter of luck as to the quality of led you will receive. There are just too many dealers. But as you said, they are good enough.
Where did you get your little psu?
RTOHIO Yeeco DC DC Buck Voltage Regulator Power Converter Supply Constant Voltage & Current Volt & Amp Converters Adjustable 7-36V to 1.25-32V Step Down 5A 75W LED Driver LED Voltmeter Display USB Output www.amazon.com/dp/B00XM8SM66/ref=cm_sw_r_cp_apa_SDJGzbPSN3Z3M
Is "smoodge" a technical term?
Yoshi Jeffery very technical
Learned literally nothing about how to drive high power LEDs from this video. Your power supply did all the work. The difficulty with high power LEDs is how to limit the current. Resistors are impractical because, for any measurable voltage difference between the LED and power supply, you're losing multiple watts at the resistor. I clicked hoping to see how people deal with this ... maybe you'd consider doing a followup because the difficulties of current regulation is kinda the elephant in the room when it comes to high power LEDs.
Did you find a good video? Currently having the same issue
@@Trikz No but I found some decent writeups. Seems like the normal way is to put an LM317 in series with the LED and set the current by putting resistors across it's control pins. If you need more than 1.5A theres an LM338 that works up to 5A. Google either of those parts and you'll see the same articles I was looking at. I ordered 10 of both (they're cheap!), still waiting for delivery. Maybe I'll make a video lol.