System, apparatus, and method for driving light emitting...

Details System, apparatus, and method for driving light emitting... System, apparatus, and method for driving light emitting...

2006-02-07

2006-02-07

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S291000, C315S307000, C315S224000, C327S355000, C327S536000, C345S102000

Reexamination Certificate

active

06995518

ABSTRACT:
A system, apparatus, and method for allowing LED operation in circuits operating with power supply levels that are below the forward voltage limits of the LED. A first level of a modulated voltage signal is applied to charge a voltage increasing component in a first phase of operation. A second level of the modulated voltage signal is then summed with the voltage stored across the voltage increasing component to provide adequate forward potential across Light Emitting Diode (LED) for illumination. The second level of modulated voltage is also used to provide a source of constant forward current to be conducted by LED when in its luminescent state.

REFERENCES:
patent: 6116512 (2000-09-01), Dushane et al.
patent: 6486726 (2002-11-01), Worley et al.
patent: 6680834 (2004-01-01), Williams
patent: 6731871 (2004-05-01), Kitani et al.
patent: 2004/0195978 (2004-10-01), Horiuchi et al.

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