Led driver current amplifier

Details Led driver current amplifier Led driver current amplifier

2006-05-02

2006-05-02

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Visual indication

Using light emitting diodes

C340S636120, C340S636130, C340S636150, C315S224000, C315S291000

Reexamination Certificate

active

07038594

ABSTRACT:
A circuit powering an electrical device based on a commanded current signal is provided. The circuit includes a linear current amplifier which sets a desired current flow. The circuit also dynamically controls a supply voltage in order to minimize power dissipation of the linear current amplifier. The circuit may also include a voltage drop measurement amplifier, a voltage shaping amplifier, and a switching power supply. The circuit is useful for controlling electrical devices requiring precise current control and minimal power dissipation, for example, driving light-emitting diodes (LEDs) that provide illumination inside the passenger compartment of a vehicle for an imaging occupant detection system.

REFERENCES:
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patent: 6144222 (2000-11-01), Ho
patent: 6198236 (2001-03-01), O'Neill
patent: 2001/0043113 (2001-11-01), Hoshino et al.
patent: 2003/0025120 (2003-02-01), Chang
patent: 2003/0235062 (2003-12-01), Burgyan Lajos et al.
European Search Report dated Apr. 5, 2005.

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