Hi all,
I have a series of LED lamps 23 w each powered by individual constant current ballasts. The outputs are pwm modulated with a transistor. The ballasts are always on. There is also a ceiling fan with a regular leading edge phase dimmer and a switch in series.
The problem is that when the fan is switched on/off using it's switch, the LED lamps will turn on for a brief instant. This inspite of shorting the base-emitter (after isolating the uc).
I suspect that the fan is dumping energy into the mains and two back to back 4007 diodes should solve the issue.
But could there be a better method?
I have a series of LED lamps 23 w each powered by individual constant current ballasts. The outputs are pwm modulated with a transistor. The ballasts are always on. There is also a ceiling fan with a regular leading edge phase dimmer and a switch in series.
The problem is that when the fan is switched on/off using it's switch, the LED lamps will turn on for a brief instant. This inspite of shorting the base-emitter (after isolating the uc).
I suspect that the fan is dumping energy into the mains and two back to back 4007 diodes should solve the issue.
But could there be a better method?