Control circuit and method for illuminating an electroluminescen

Details Control circuit and method for illuminating an electroluminescen Control circuit and method for illuminating an electroluminescen

1998-05-06

2000-03-28

Philogene, Haissa

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315291, 315209R, 315DIG7, G09G 310

Patent

active

060436093

ABSTRACT:
A power supply or inverter circuit is provided for regulating power to electroluminescent lamps over a range of lamp sizes. The power supply may have an AC and/or DC input and includes at least one switch having a power input to be coupled to an electrical power source, a control input, and an output to be coupled to an electroluminescent lamp for being switched on and off to generate a drive signal to the lamp having a predetermined constant frequency and current level that is selectable over a range of frequency and current levels. A constant current mode controller has a control output coupled to the control input of the switch for turning the switch on and off so as to maintain a constant current level and frequency of the drive signal to the electroluminescent lamp substantially over its operating life. The voltage applied to the lamp is allowed to increase to a predetermined voltage limiting value in order to provide compensation due to aging of the lamp.

REFERENCES:
patent: 4988889 (1991-01-01), Oughton, Jr.
patent: 5144203 (1992-09-01), Fujita et al.
patent: 5293098 (1994-03-01), Brownell
patent: 5335162 (1994-08-01), Martin-Lopez et al.
patent: 5463283 (1995-10-01), Sanderson
patent: 5517089 (1996-05-01), Ravid
patent: 5612858 (1997-03-01), Weinmeier et al.
patent: 5677599 (1997-10-01), Wood

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