Patent ID: 8901852

Claim:
A light emitting diode (LED) bulb comprising: a shell; a plurality of LEDs within the shell; and a driver circuit configured to operate the plurality of LEDs at a plurality of brightness levels, the driver circuit comprising: a first input configured to receive alternating current (AC); a second input configured to receive AC; a neutral input; a converter circuit connected to the plurality of LEDs; a first rectifier circuit connected to the first input and the neutral input, the first rectifier circuit configured to rectify the AC received at the first input into direct current (DC); a second rectifier circuit connected to the second input and the neutral input, the second rectifier circuit configured to rectify the AC received at the second input into DC; one or more detector circuits, the one or more detector circuits connected to the first rectifier circuit and the second rectifier circuit; a signal processing circuit having a first processor input and a second processor input, the signal processing circuit connected to the one or more detector circuits; and wherein the signal processing circuit is configured to produce a chop signal with a duty cycle, the duty cycle based on whether the first input is hot and whether the second input is hot; and wherein the converter circuit powers the plurality of LEDs at a driving current, the driving current based on the chop signal.