High wattage led driver

167

04:14:46

Driver for led lights. Constant current. Led modules approx 35v. Application in progress. Works great!

published 7 years ago

BillyT

7 years ago

Two problems, 1: 120V rms is 170V peek . 2: There is too big a difference between the supply voltage and the output voltage. As such a transformer is recommended for this circuit.

aj_something

7 years ago

I want to drive the led without the weight of the transformer. And a standard 120v input. A transformer is not an option for this application. Any suggestions on enhancements?

hurz

7 years ago

Without the weight of the transformer. Right, but with the weight of a hugh heat sink, LOL! Listen to BillyT and do some more calculation about power dissipation and rms values in mains and electrical engineering. And learn what an option for you is as long you dont understand its advantages!

jeff40

7 years ago

For 120Vpp you will dissipate about 20W in that fet and if you use mains(170Vpp) that will be about 50W.

aj_something

7 years ago

Heat dissipation is high. Looking into buck converter, cant find parts to produce the required wattage. With 6 100w led modules it does not cover the lumen output of the mercury vapor its replacing. I plan on having 1000-1500w of led light. Flicker is crazy annoying. Overall output is getting where i want to be.

hurz

7 years ago

Started with a linear regulator which was quickly a showstopper if you know how to calculated its power loss! Now we are at buck converter and already have some iron in the game. Buck converter needs coils or even transformer if you like to be safe and have a galvanic seperation. Lets see how long your plans are valid and might change finaly to a pure transformer solution. All in all quite chaotic project planning.

rich11292000

7 years ago

Buy a e39 led bulb and bypass the mercury vapor ballast.

aj_something

7 years ago

Rich11292000 thank you for the suggestion. I tried the e39 bulb. Not really that bright. A single 100w led module from amazon is more dirrectional and provides the same lumen output. Do you know of others?

aj_something

7 years ago

Hurz, and exactly how large is a 700w 120v to 48v ttansformer? How much does that bad boy weigh? And yes im going all over the place because i assumed this app was to test out ideas and come to a final idea. I apparently also made the mistake of assuming the people here would help me learn more about electronics. Yes the transformer would work but then by your logic I should have a huge transformer in my electric car... I wonder why that 125kw motor and 400v battery can run on the little black box the size of a loaf of bread. (Liquid cooled).

aj_something

7 years ago

Circut is working as shown now. Anyone with suggestions how to improve (that does not involve replacing everything with a transformer)?

BillyT

7 years ago

There are 100w modules available that run straight off mains power, these have switch mode power supplies designed by engineering teams built in, if you are not specific about what you are trying to achieve you won't get the exact answers you are trying to get. And if you don't have enough knowledge about electronics or electricity, don't get upset when people who do know what they are talking about try to steer you in the right direction.

aj_something

7 years ago

Good point, i apologise for that. I was not informed on the ones that run off mains voltage. I will definitely be getting those. Thank you all for your help

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