Here in southeast Old, we have the unfortunate problem of LED mains lights flicker when using a dimmer. This is caused by the ripple injection to turn on/off off-peak devices. Even though I have installed a "ripple filter", they still flicker. I have noticed that when no dimmer is in the circuit, the lights no longer flicker. My thoughts to eliminate this flicker would be to rectify the 230V AC to-350V DC after the dimmer and before the LEDs, seeing as the LEDs would do this internally anyway, and add filtering to clean up the DC.
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