Constant current light emitting diode (LED) driver circuit...

Details Constant current light emitting diode (LED) driver circuit... Constant current light emitting diode (LED) driver circuit...

2011-05-17

2011-05-17

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S308000, C315S312000, C323S277000, C323S280000, C323S282000

Reexamination Certificate

active

07944153

ABSTRACT:
A drive circuit supplies a drive current to a plurality of light emitting diodes. The drive circuit includes a voltage converter circuit having a particular topology and including at least one inductive element and at least one switching element. The drive circuit senses a current through one of the inductive and switching elements and generates a feedback signal from the sensed current. The feedback signal has a value indicating the drive current being supplied to the light emitting diodes and the drive circuit controls the operation of the voltage converter responsive to the feedback signal.

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patent: 6466188 (2002-10-01), Cato
patent: 6596977 (2003-07-01), Muthu et al.
patent: 7202608 (2007-04-01), Robinson et al.
patent: 7425803 (2008-09-01), Shao et al.
patent: 7542257 (2009-06-01), McCormick et al.
patent: 2007/0080911 (2007-04-01), Liu et al.

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