Hi guys, anyone experienced with those ceiling LED panels, those 24-48V , constant current? I was researching possibilites, how to use them and it’s something completly different that LED strips. Any tips, whats best combination for controlling those from home asssistant? My understanding is i need LED panel (preferably CCT), then some power source, which can be externally driven and some dimmer? For example … this panel … LED stmívatelný panel ZEUS CCT 40W 30×120cm vestavný bílý s regulací teploty barev LED-GPL44/B-40/BI/CCT - TopLux - Osvětlení Praha … it has some manual controller gadget, which is integrated with power supply. I thought , i would replace power supply with two - each for separate white color channel - it turns out, it has common “+” voltage pin for both channels, so i cannot use two power supplies with common ground … I would preffer something esphome-ready, or i saw some zigbee based dimmers … I was searching on this forum but did not found any answered topics. Thanks for any hints
Normally, one PSU is enough and it doesnt matter if both positive are connected or both grounds are connected. The basic circuit uses per LED color one pwm pin, a mosfet driver, a mosfet and a resistor. This is the same as for dumb led strips, just a higher voltage. If the dimmer circuit is placed in the positive rail, you have to use p-channel mosfets and invert the pwm pin (else 20% brightness set results in 80% brightness and 100% setting results in the device being off), if its placed in the negative rails just use n-channel mosfets.
There´s also an advanced circuit which is a real constant current source, the youtuber GreatScott made a video about it (DIY WiFi RGB LED Lamp || ESP8266 & Blynk - YouTube), basically the current that flows through the led is compared to the set value and then turnt on or off. The advantage is a longer lifespan of the led´s.
For myself, ive built the dumb driver for some 12V rgb fans inside my PC which is enough, but for your project, the real constant current driving circuit by greatscott would be better.
And basically, theres no need to replace the power supply with dimming circuit, just use the 100% setting in it and making sure noboby changes it (like dropping a ton hotglue on the dimming switch, hiding it behind the wall or so on) and place the dimming circuit with HA support in between the PSU and the panel
Yeah, one psu is fine, but i was searching for some replacement with two outputs, like the one in this particular panel, but which could be driven via some external dimmer for example and i could not find one.
So you are basically telling me, i can drive it like this?
Replacing the 36V LED controller in a LED panel - #4 by lukastillmann?
It will convert it to PWM driver, i guess. I thought, that this LED panels use voltage regulation, current stays constant