Electronics > Projects, Designs, and Technical Stuff
Phase shift mains AC to de-flicker LEDs
Zero999:
If you have a three phase power supply, then the obvious solution is to put each LED lamp on a different phase. This is often done with old fluorescent and discharge lamps in large offices and factories. The lamps themselves will still flicker of course, but the light in the room not so much.
If you want to hack, then how about making your own LED lamp driver?
Poe:
I simply increased the flicker frequency by adding additional off time and compensated by increasing the current during the on-times.
So instead of receiving a constant ~13W for ~6ms, then off for ~2ms near zero-cross (75%DC @120Hz)...
I drive it with ~20W for 2ms after Vin >30V, then off for 2ms near Vpk, then repeat until under 30V. It's basically off for 50% of the time with a frequency of 240Hz.
Power is about the same. Largely eliminated the visuals by just adding a few passives to the existing drive circuit.
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