| Patent Number |
Title Of Patent |
Date Issued |
| 4613796 |
Single transistor oscillator ballast circuit |
September 23, 1986 |
| A single power transistor oscillator circuit includes a single transistor oscillator coupled by an inductive means including an inductive coil and transformer to a DC potential development means with a wave-shaping means coupled to a secondary winding of the transformer to provide a |
| 4532456 |
Output circuit for an electronic ballast system |
July 30, 1985 |
| The above and other objects, advantages and capabilities are achieved in one aspect of the invention by an output circuit for an electronic ballast system. The circuit includes N sets of output connections for accepting N lamps. The lamps are driven by an output autotransformer coupled t |
| 4525649 |
Drive scheme for a plurality of flourescent lamps |
June 25, 1985 |
| The above and other objects, advantages and capabilities are achieved in one aspect of this invention by a drive scheme for a plurality, that is, for N, where N-2, flourescent lamps. The drive circuit comprises (N+1) pairs of output terminals, each comprising associated first and second |
| 4441054 |
Stabilized dimming circuit for lamp ballasts |
April 3, 1984 |
| A stabilized dimming circuit for an electronic ballast system. The dimming circuit includes a transformer having a variable inductance primary included as a part of a feedback loop comprising a push-pull inverter and an output transformer for supplying a drive signal to a lamp filament. |
| 4437040 |
Method of effecting stabilized dimming of fluorescent lamps |
March 13, 1984 |
| In order to effect stabilized dimming of a fluorescent lamp, that is, in order to vary the power level supplied the lamp while maintaining a substantially constant filament voltage, a first, variable, inductance is included as an element of oscillator (inverter) feedback loop. The voltag |
