Hi everyone, I have an idea but before I spend money on my idea I wanted to open a topic and hear from you. I want to design a LED driver with dimmer functionality. I have added a photo of the LED light that I want to drive.
Typically these led light are 45-100 Watts. So they come with AC/DC converter inside. I just want to switch on and off + Dim the light. To do this, I have thought to use PWM to drive an optocoupler. This optocoupler will drive an N Channel mosfet IRF540N. AC/DC connector will connect to LED light through IRF540N. Is this a good idea ? if it is a good idea, is there a product that can be programmed with I2C and produce PWM signal ?
"Names" is not very specific.
I think you mean recessed flat panel LED lights for suspended ceilings.
Seems most come with a non-dimmable supply.
I don't think it's wise to switch/PWM the output of that suppy with a mosfet.
Maybe you should replace that supply with a (PWM) dimmable constant current LED driver.
Leo..
Wawa:
"Names" is not very specific.
I think you mean recessed flat panel LED lights for suspended ceilings.
Seems most come with a non-dimmable supply.
I don't think it's wise to switch/PWM the output of that suppy with a mosfet.
Maybe you should replace that supply with a (PWM) dimmable constant current LED driver.
Leo..
hmm, I am not very familiar with the LED driving concept. Thanks for redirecting me. Yes the driver is not dimmable. Is there a driver that can supply 100 watt power to white LED light ?
yes there are meanwell drivers at that range but I would like to build myself. This is what I dont understand. Most of the led driver ICs that run 80-240 VAC outputs approximately 12-15 V. What if my lamp has 40 LEDs on its strip. Is there a common led connection type in these things ? if the leds are not parallel, I would need 68 V driver for driving it.
If all 40 LEDs a in series, and white, then you would need at least 40*3.3volt = 132volt.
But LED current is more important, and maybe not all LEDs are in series.
You must know exact LED details if you want to replace the standard driver.
Leo..
nurimo:
yes there are meanwell drivers at that range but I would like to build myself. This is what I dont understand. Most of the led driver ICs that run 80-240 VAC outputs approximately 12-15 V. What if my lamp has 40 LEDs on its strip. Is there a common led connection type in these things ? if the leds are not parallel, I would need 68 V driver for driving it.
So, you're trying to retrofit the power supply on a lamp you do not have specs for while you do not understand how such things work, but you absolutely want to build one yourself. That is, you want to build electronics that connect directly to AC mains without knowing how such things work.
