LED driver for street light 50W - Page 1
Forum section: electronics / projects

author: Sethu123
author_rank: Newbie
timestamp: March 13, 2021, 06:17:27 am
content: Hello friends,I would like to design a led driver circuit for street light, 50W led driver.LED/Optoelectronics specificationVoltage: 3.3vCurrent: 60mApower: 0.2wcolor: whitePackage:1113(2835 metric)But I was struggling in initial stage of design. Where to start this project.My input voltage will be 230V Ac voltageI can convert it to DC voltageplease suggest any led drive IC for my application, with PWM controller for dimming the brightness of light at day time.

author: strawberry
author_rank: Super Contributor
timestamp: March 13, 2021, 11:07:25 am
content: cooling 50W?BJT constant current source = linear / PWM+constant current dimming , cheapisolated PSU is better = no HV potential between LED and heatsink Ground

author: Zero999
author_rank: Super Contributor
timestamp: March 13, 2021, 06:26:24 pm
content: So you need 250 LEDs, which is quite a lot, but I'd even go for more, say 300 or and under-drive them, for longer life.The simplest solution is to use a capacitive dropper, just a big capacitor in series with a bridge rectifier, with the LEDs and smoother capacitor on the output.https://en.wikipedia.org/wiki/Capacitive_power_supplyhttp://www.bigclive.com/ledlmp.htm

author: mariush
author_rank: Super Contributor
timestamp: March 13, 2021, 08:02:19 pm
content: You should first figure out if it needs to be isolated or if it can run directly from 240v and no isolation required (so you could use a capacitive dropper or whatever)You could use a professionally made power supply that converts whatever AC voltage to 24v or maybe 48v and you could then have multiple strings of leds with maximum forward voltage below that voltage.For example, let's say you go with 48v ... 48v / 3.3v = 14 leds ... so let's say you go with a series of 12 groups of 3 leds in parallel, so for each 36 leds you would need a forward voltage of at least 40v and 3x0.06A = 0.20A and then you could have a led driver with 8 channels x 36 leds = 288 ledsWant half power? Disable 4 channels out of 8 ...

author: Marco
author_rank: Super Contributor
timestamp: March 14, 2021, 10:26:25 am
content: Presumably a streetlight will need to have PFC ... then the question becomes, is it allowed to flicker?

author: ocset
author_rank: Super Contributor
timestamp: March 14, 2021, 06:27:43 pm
content: You need a Flyback PFC LED drivergo to this course..download ithttps://drive.google.com/file/d/0B7aRNbu3Fes4TU92Mkw3YlA3ams/view?usp=sharing..in here there are folders called "Flyback_LT3799"" and "Flyback_PFC" and "LED_Drivers_1"They will be of some help to you.

author: nctnico
author_rank: Super Contributor
timestamp: March 15, 2021, 12:04:08 am
content: Quote from: Sethu123 on March 13, 2021, 06:17:27 amWith the thermal design. That is what will drive things like size, circuit board material (FR4 or aluminium substrate), maximum voltages, life span/ reliability, etc.

author: Siwastaja
author_rank: Super Contributor
timestamp: March 15, 2021, 06:38:01 am
content: By finding a professional team to do it.You can start from scratch and learn all the skills needed, but that's worth of a few compete books and will take at least a decade, there is no way you are getting any comprehensive answers on a forum.That being said, yes, mechanical and thermal design pretty much defines the project.

author: ElektroHS
author_rank: Contributor
timestamp: March 16, 2021, 04:17:03 pm
content: if you are going to use outdoor, then you should consider many factors like cooling, waterproof protection, etc. In addition it depends on your final goal - if you want to learn how to do... it's one thing. In case of you want to use it for much time as primary or similar light.. then is more cheaper to buy "original product".I have similar LED projector and it enough warm with aluminium radiator for cooling. While I don't use it often... so it's OK.So what is your final goal?