Patent ID: 9332602
Filing Date: 2016-05-03
CPC Classification: H05B,Y02B

Claim Text:
1. A light emitting diode (LED) driver for providing an operating direct current (DC) voltage to an LED array, the LED array including a plurality of LEDs connected in series for providing illumination, comprising: a transformerless voltage boost circuit configured to receive a filtered DC source voltage and to provide the operating DC voltage to the LED array; a hysteretic self-oscillating circuit for driving the transformerless voltage boost circuit at an oscillation frequency; and a tap connected between two of the plurality of LEDs in the LED array for providing an auxiliary DC voltage to the hysteretic self-oscillating circuit, wherein the auxiliary DC voltage is at least a part of the operating DC voltage provided to the LED array from the transformerless voltage boost circuit and the auxiliary DC voltage provided by the tap connected between the two of the plurality of LEDs in the LED array powers the hysteretic self-oscillating circuit for driving the transformerless voltage boost circuit at the oscillation frequency.