Light emitting diode multiphase driver circuit and method

Details Light emitting diode multiphase driver circuit and method Light emitting diode multiphase driver circuit and method

2006-07-25

2006-07-25

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

Sequential starting

C315S312000, C315S18500S, C315S20000A, C315S291000, C362S800000, C362S801000, C362S806000

Reexamination Certificate

active

07081722

ABSTRACT:
A method and a circuit for driving light emitting diodes (LEDs) in multiphase are provided. A string of LEDs divided into groups connected to each other in series is provided. Each group is coupled to ground through separate conductive paths. A phase switch is provided in each conductive path. Increasing the input voltage turn on the string of LEDs, group by group in the sequence downstream the string. To reduce power dissipation, the phase switch of an upstream group is turned off when next downstream group is turned on.

REFERENCES:
patent: 6011358 (2000-01-01), Knobloch et al.
patent: 6161910 (2000-12-01), Reisenauer et al.
patent: 6201354 (2001-03-01), Kokubo
patent: 6351079 (2002-02-01), Willis
patent: 6590343 (2003-07-01), Pederson

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