Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1994-11-14
1996-02-20
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315314, 3151693, 315156, 315158, 315DIG4, G05F 100
Patent
active
054931835
ABSTRACT:
An EL lamp characterized by non-linear brightness decay is driven to constant brightness for the life of the lamp by an inverter controlled by a microprocessor. The microprocessor controls the inverter in accordance with a table containing data which is the inverse function of the non-linear brightness decay. The microprocessor tracks the total on-time of the EL lamp and selects the appropriate data from the table for driving the lamp. Control can be analog or digital. If control is analog, the selected data is coupled to a D/A converter which is coupled to the inverter. If control is digital, the selected data is coupled to a counter driving a pulse width modulator which is coupled to the inverter. In accordance with another aspect of the invention, an EL lamp is dimmed a precise amount based upon the data in the table and the EL lamp can be dimmed in unison with other lamp types, each lamp type having a table containing data for dimming.
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patent: 4527096 (1985-07-01), Kindlmann
patent: 5089748 (1992-02-01), Ihms
patent: 5272327 (1993-12-01), Mitchell et al.
patent: 5313141 (1994-05-01), Kimball
patent: 5336978 (1994-08-01), Alessio
patent: 5381074 (1995-01-01), Rudzewicz et al.
Durel Corporation
Pascal Robert J.
Philogene Haissa
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