Patent · US Active

Power supply circuit

US7973487B2 · kind B2 · utility

7Cited by

3References

19Claims

0Family size

Assignee

TEXAS INSTRUMENTS DEUTSCHLAND GMBH · DE

Inventors

Christophe Vaucourt · Munich, DE
Erich Bayer · Straubing, DE
Paul Brohlin · Parker, US

Key dates

Filing date	Mar 26, 2008
Grant date	Jul 5, 2011
Priority date	—
Expiry date	Oct 26, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG03B2215/05
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A power supply circuit is proposed for supplying current to a pair of white LEDs connected in series. The circuit comprises a DC-DC power converter, with a charge pump coupled to the output of the DC-DC power converter. A super capacitor is coupled to the charge pump to be charged to a voltage on top of the converter output in a first mode of operation. The super capacitor is discharged through the pair of LEDs during a second mode of operation. A control stage is provided for switching between the first mode of operation and the second mode of operation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.