LED driving circuit

Details LED driving circuit LED driving circuit

2006-11-21

2006-11-21

Nguyen, Hoang V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S193000, C315S18500S, C315S192000, C315S187000

Reexamination Certificate

active

07138770

ABSTRACT:
An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches operates in a positive half cycle of the AC power supply and the second pair of branches operates in a negative half cycle of the AC power supply, so the lighting time for each LED is less than a half cycle time, in other words, the time for heat dissipation is prolonged.

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patent: 6069452 (2000-05-01), Rossner
patent: 6641294 (2003-11-01), Lefebvre
patent: 6830358 (2004-12-01), Allen
patent: 6972528 (2005-12-01), Shao

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