Drive circuit for at least one LED strand

Details Drive circuit for at least one LED strand Drive circuit for at least one LED strand

2006-06-13

2006-06-13

Lefkowitz, Sumati (Department: 2675)

Communications: electrical

Visual indication

Using light emitting diodes

C345S048000

Reexamination Certificate

active

07061394

ABSTRACT:
Drive circuit for at least one LED strand, with a switch being arranged in series with each LED strand and with each LED strand having a supply connection via which it can be connected to a supply voltage, in which case each switch can be driven so as to allow a current to flow in the associated LED strand, having a first control loop which is designed to drive the switch of the at least one LED strand such that an adjustable mean value is achieved for the current flowing through the LED strand, with the drive circuit also having: a second control loop which is designed to provide a supply voltage for the at least one LED strand as a function of the peak value of the current flowing through the at least one LED strand.

REFERENCES:
patent: 5823950 (1998-10-01), Diab et al.
patent: 5949225 (1999-09-01), Sawtell
patent: 6586890 (2003-07-01), Min et al.
patent: 6724376 (2004-04-01), Sakura et al.
patent: 6825619 (2004-11-01), Norris
patent: 2002203988 (2002-07-01), None

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