Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1988-12-12
1991-06-11
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315208, 315DIG4, 315DIG7, 315307, 315276, 315287, H05B 3702, H05B 4116, H05B 3904, G05F 100
Patent
active
050235184
ABSTRACT:
A ballast circuit for a gaseous discharge lamp, particularly a neon light, includes a diode bridge rectifier for producing a d-c voltage from an a-c input and a transformer with a secondary winding connected to the lamp and a primary winding connected to the rectifier. A switching circuit is connected to the transformer primary winding for controlling a flow of current therethrough from the rectifier. The switching circuit includes at least one MOSFET having a drain terminal connected to the transformer primary winding and a grounded source terminal. A control circuit is connected to a gate terminal of the MOSFET for controlling the on and off times thereof, the control circuit including a pulse generator for producing a train of pulse-width-modulated rectangular pulses of substantially a single frequency fed to the MOSFET's gate terminal. The pulse generator includes circuitry for changing the width of the rectangular pulses to enable a gradual energization of the gaseous discharge lamp from one end thereof towards an opposite end to create a writing effect of selectively different speeds in the gaseous discharge lamp. The circuitry in the pulse generator for changing the pulse width can be used to control the widths of the pulses so that the pulses are a train of square waves having a common duration equal to an interpulse period, whereby striations are generated in the gaseous discharge lamp.
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Circuit Diagram, "Sch. UPS BRD Writer Module," Techlite, Kile Technology, Inc., 13-0316-02, Jun. 3, 1987.
Circuit Diagram, "Sch. Universal Power Source," Techlite, Kile Technology, Inc.
Mans Wayne K.
Rizzo Vincent J.
Coleman Henry D.
LaRoche Eugene R.
Shingleton Michael B.
Sudol R. Neil
Urda Joseph A.
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