Bi-direction constant current device

Details Bi-direction constant current device Bi-direction constant current device

2009-05-07

2011-12-06

Le, Don (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S287000, C315S2090SC, C326S082000

Reexamination Certificate

active

08072162

ABSTRACT:
An LED lamp includes a bi-direction constant current device coupled between a power supply and a LED load to provide stable positive and negative currents to the LED load. The bi-direction constant current device includes a pair of current sources face-to-face or back-to-back connected in series between the power supply and the LED load, and two protective elements shunt to the pair of current sources, respectively.

REFERENCES:
patent: 4939426 (1990-07-01), Menard et al.
patent: 5627480 (1997-05-01), Young et al.
patent: 5736870 (1998-04-01), Greason et al.
patent: 7692450 (2010-04-01), Aranovsky
patent: 2002/0043943 (2002-04-01), Menzer et al.
patent: 2006/0290381 (2006-12-01), Bui et al.
patent: 2009/0224689 (2009-09-01), Yang

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