Power supply for electroluminescent lamps
AssigneeSEG Corporation
InventorGreg A. Brownell
Life of this patent
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Abstract
A power supply for an electroluminescent lamp. The power supply includes an inverter circuit for conveying a DC voltage into a 2000 Hz sinusoidal voltage. The lamp is capacitive in its nature and changes its capacitive value over extended use which adjusts the output frequency of the inverter. A sensor and timers are included which in combination flash the lamp in a predetermined pattern when motion is detected by the sensor.
Claims14
In combination, a power supply and an electroluminescent lamp, said lamp being substantially capacitive, said power supply including;
- a voltage source means for providing a DC voltage;
- converting means operatively associated with said voltage source means for converting said DC voltage into a sinusoidal voltage of a predetermined frequency, said converting means including an output, said sinusoidal voltage being at said output with said DC voltage applied to said converting means;
- said converting means output connected to said lamp;
- said lamp being illuminated by said sinusoidal voltage when said converting means is turned on and connected to said lamp;
- said capacitive lamp constituting means for adjusting the output frequency of said sinusoidal voltage as said lamp ages.
In combination, a power supply and an electroluminescent lamp, said lamp being substantially capacitive, the combination comprising;
- said power supply including a voltage source means for providing a DC voltage;
- inverting means operatively associated with said voltage source means for converting said DC voltage into a sinusoidal voltage of a predetermined frequency;
- said inverting means including an output;
- said sinusoidal voltage being at said output with said DC voltage applied to said converting means;
- said lamp connected to said inverting means output;
- said lamp being illuminated by said sinusoidal voltage when said inverting means is turned on;
- said lamp constituting means for adjusting the output frequency of said sinusoidal voltage as said lamp ages;
- said inverting means including an inductive self-oscillating resonant circuit;
- said resonant circuit including a transformer operatively associated with a transistor means;
- said transistor means for enabling oscillations of said transformer;
- said circuit resonating at a frequency substantially determined by said capacitive lamp and the inductance of said transformer;
- timer means connected to said transistor means for turning on and off said transistor means for a predetermined period of time;
- said timer means including first and second timers associated with said voltage source means such that said timers are activatable in combination and individually to turn said transistor on and off in two selectable patterns.
In combination , a power supply and an electroluminescent lamp, said lamp being substantially capacitive, the combination comprising;
- said power supply including voltage source means for providing a DC voltage;
- inverting means operatively associated with said voltage source means for converting said DC voltage into a sinusoidal voltage of a predetermined frequency;
- said inverting means including an output;
- said sinusoidal voltage being at said output with said DC voltage applied to said converting means;
- said lamp connected to said inverting means output;
- said lamp being illuminated by said sinusoidal voltage when said inverting means is turned on;
- said lamp constituting means for adjusting the output frequency of said sinusoidal voltage as said lamp ages;
- said inverting means including an inductive self-oscillating resonant circuit;
- said resonant circuit including a transformer operatively associated with a transistor means;
- said transistor means for enabling oscillations of said transformer;
- said circuit resonating at a frequency substantially determined by said capacitive lamp and the inductance of said transformer;
- said transistor means being an NPN transistor having a base, emitter and collector;
- a first resistor connected between said transistor base and connector;
- said transformer including a secondary winding and a primary winding which includes in series a feedback winding part;
- a second resistor connected between said transistor emitter and said primary winding;
- a third resistor connected between said feedback winding and said transistor base;
- said transistor collector connected to said voltage source means;
- and said secondary winding connected to said lamp.
A circuit for driving an electroluminescent lamp comprising inverting means operatively associated with a DC voltage source for converting the DC voltage of said source into a sinusoidal voltage of a predetermined frequency for application to said lamp;
- said inverter means including an NPN transistor having a base, emitter and collector;
- a transformer having a secondary winding and a primary winding which includes in series a feedback winding;
- a first resistor connected between said transistor base and collector;
- a second resistor connected between said primary winding and said transistor emitter;
- a third resistor connected between said feedback winding and said transistor base;
- said transistor collector adapted for connection to said power source;
- and said secondary winding adapted for connection to said lamp.
Dependencies are inferred from the claim text.