| US 7,564,198 B2 | ||
| Device and method for driving LED | ||
| Kenji Yamamoto, Kanagawa (Japan); and Richard Lum Kok Keong, Singapore (Singapore) | ||
| Assigned to Avago Technologies ECBU IP (Singapore) Pte. Ltd., Singapore (Singapore) | ||
| Filed on Aug. 29, 2007, as Appl. No. 11/847,273. | ||
| Claims priority of application No. 2006-232786 (JP), filed on Aug. 29, 2006. | ||
| Prior Publication US 2008/0094000 A1, Apr. 24, 2008 | ||
| Int. Cl. H05B 37/00 (2006.01) | ||
| U.S. Cl. 315—307 [315/192; 315/193] | 13 Claims |
| 1. An LED lighting device comprising:
a rectifier circuit for rectifying an AC source;
an LED array having a plurality of series-connected LEDs;
a floating current source connected in series between the rectifier circuit and the LED array; and
control means for determining the magnitude of an output voltage of the rectifier circuit and, depending on the determination
result, controlling the on/off of a driving current to each LED of the LED array.
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