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Switched-capacitor isolated LED driver

United States Patent

March 22, 2016
View the Complete Patent at the US Patent & Trademark Office
A switched-capacitor voltage converter which is particularly well-suited for receiving a line voltage from which to drive current through a series of light emitting diodes (LEDs). Input voltage is rectified in a multi-level rectifier network having switched capacitors in an ascending-bank configuration for passing voltages in uniform steps between zero volts up to full received voltage V.sub.DC. A regulator section, operating on V.sub.DC, comprises switched-capacitor stages of H-bridge switching and flying capacitors. A current controlled oscillator drives the states of the switched-capacitor stages and changes its frequency to maintain a constant current to the load. Embodiments are described for isolating the load from the mains, utilizing an LC tank circuit or a multi-primary-winding transformer.
Sanders; Seth R. (Berkeley, CA), Kline; Mitchell (Oakland, CA)
14/ 293,107
June 2, 2014
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under ADEPT DE-AR0000114 awarded by the U.S. Department of Energy (DOE) through the Advanced Research Projects Agency-Energy (ARPA-E). The government has certain rights in the invention.