Patent ID: 8228001

Claim:
A LED drive system comprising: A bridge rectifier to rectify an AC input voltage, A capacitor connected between the two DC output terminals of said bridge rectifier, A LED device, wherein the device is preferably a string of multiple LEDs or OLEDs in series, An inductor connected in series with the LED device, wherein one terminal of the inductor-LED serial network is connected to the positive output of the bridge rectifier, and the other terminal connected to the positive terminal of a power switching device, and wherein the direction of the LED device is such that it is forward biased when the power switching device is turned on, Said power switching device with its positive power terminal connected to the inductor-LED serial network, and with its negative power terminal connected to one terminal of a sense resistor, Said sense resistor with the other terminal connected to the negative output terminal of the bridge rectifier; and A freewheel diode with its anode connected to the positive power terminal of the power switching device, and with its cathode connected to the positive output of the bridge rectifier.