Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2005-01-11
2005-01-11
Philogene, Haissa (Department: 2828)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S2090SC, C315S291000, C315S312000, C315SDIG004, C323S218000, C323S233000
Reexamination Certificate
active
06841950
ABSTRACT:
A method for dimmable control of a multiple output EL lamp driver is disclosed. The multiple output EL lamp driver has a power converter. A plurality of EL lamps are provided wherein one terminal of each EL lamp is coupled to a single common terminal. A plurality of half bridge circuits are provided wherein each circuit has an output impedance. One half bridge circuit is coupled to the single common terminal and each remaining terminal of each EL lamp is coupled to a separate individual half bridge circuit. A logic circuit is coupled to each of the half bridge. An oscillator is coupled to the logic circuit. The method comprises: minimizing the output impedance of the half bridge circuit coupled to the single common terminal to prevent to brightness crosstalk between EL lamps; selecting output impedances of remaining half bridge circuits to produce rounded waveforms across terminals of the EL lamps; and manipulating a drive waveform of one of the plurality of EL lamps to control brightness.
REFERENCES:
patent: 5336978 (1994-08-01), Alessio
patent: 5418434 (1995-05-01), Kamens et al.
patent: 5861719 (1999-01-01), Koskowich et al.
patent: 6011382 (2000-01-01), Littlefield et al.
Moy Jeffrey D.
Philogene Haissa
Supertex Inc.
Weiss Harry M.
Weiss, Moy & Harris P.C.
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