A normal light dimmer using a TRIAC usually has some form of EMI suppression because of the current spike when the filament is turned on part way through each AC half-cycle. But if I use a pair of power MOSFETs I can turn the bulb on and off anywhere in the cycle. So I could turn the bulb on at the zero crossing and off at some phase delay point, the opposite of TRIAC operation. This should eliminate the turn-on current surge, but now could create an inductive kick at turn-off.
How inductive is an incandescent light bulb that is on? When the filament is hot its resistance is high (relative to its off resistance), so if there is any inductance it should have a low Q. How low?
ak
How inductive is an incandescent light bulb that is on? When the filament is hot its resistance is high (relative to its off resistance), so if there is any inductance it should have a low Q. How low?
ak