Hi everyone,
I have a 24V cob Led Strip. The factory controller uses PWM to modulate the brightness, I don't like that since I can see the flickering when moving my head/arms etc. So I would like to adjust the brightness in another way. From my power supply I can see the strip Draws around 1A at 24V. When I lower the Voltage to 22V the strip is essentially off. So all I need to do, is to adjust the voltage between 22V and 24V (should be easy? but I struggle alot).
I have some Ideas but I would like to hear your opinions and ideas:
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Use a StepUp Module (eg MT3608) to boost 12V to 22-24V and use a digital potentiometer instead of the trim pot to adjust the voltage. I did some research and from other posts I concluded that this not that easy/not possible...
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Use a voltage divider with a digital potentiometer. Essentially I should be able to drop the voltage enough when I use R1~500Ohm and R2 from 5k (21.7V) to 50k (23.7V). But I am worried about current in the digital pot and about the steps (most pots have 128 steps) not being able to resolve the nonlinear voltage/brightness relationship.
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Use a DAC, maybe a simple RC-Lowpass-Filter. I could modulate a 24V PWM signal and have the filter smooth it. With 90% duty I get *21.6V. That is around analogWrite(230). So I hav 25 more steps to reach max brightness (255) but once again, the brightness change is much stronger at the 22V mark. Again I might not have enough resolution then.
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Achieve some sort of voltage division/current limiting/voltage regulation with Mosfets or Transitors, but I dont fully understand them. Or make use of the Ohmic/Nonlinear Regions in some way? This transcends me...
I feel like I'm missing the obvious solution, that shouldn't be so difficult?
Thanks for your time and help!