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| Number | Title | Issue Date |
| 7279851 | Systems and methods for fault protection in a balancing transformer An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 10/09/2007 |
| 7141933 | Systems and methods for a transformer configuration for driving multiple gas discharge tubes in parallel An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 11/28/2006 |
| 6803731 | Operating circuit for a discharge lamp with early EOL detection The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, the DC voltage can be modified by an offset voltage 10 | 10/12/2004 |
| 5936356 | Fluorescent lamp flashing circuit and control A fluorescent lamp flashing circuit is comprised of a fluorescent lamp to which an alternating supply voltage source is connected through a series connected loading reactance device which provides current limiting. The heaters of the fluorescent lamp are ... | 08/10/1999 |
| 5604409 | Electronic lighting controller An electronic circuit for converting AC or DC input current to pulsating DC, then to high frequency AC. The DC input is used for aircraft applications, or in emergency situations. The circuit operates over a wide range of input voltages and frequencies, i... | 02/18/1997 |
| 5434476 | Circuitry for operating fluorescent lamps with no stroboscopic effects Circuitry is disclosed for operating with no stroboscopic effects at least three fluorescent lamps connected to a single source of single phase alternating voltage. In order to suppress the stroboscopic effects, the first lamp circuit (1) is connected in ... | 07/18/1995 |
| 4818918 | High frequency lighting system for gas discharge lamps A high frequency system for gas discharge lamps includes a method of, and apparatus for, controlling the operation of a plurality of gas discharge lamps and provides; a reduction in starting and operating voltage and current; an increased range of dimming... | 04/04/1989 |
| 4517498 | Sequence start lamp ballast with current spike suppression means A ballast for a sequence start series operating circuit that includes two rapid start gaseous discharge lamps. The circuit includes a transformer with a primary winding and a loosely coupled secondary winding, a series first capacitor for providing a lead... | 05/14/1985 |
| 4488030 | Electrical spark treatment apparatus In electrical spark treatment apparatus, more consistent and controllable sparking from multiple spark gaps is achieved by providing individual energy storage components for each spark gap, including a capacitance and an inductance in series with each gap... | 12/11/1984 |
| 4392084 | Sustainer circuit for plasma display panels Circuitry for selectively sustaining a gaseous discharge display panel to splay selected information which circuitry permits the use of a single power supply.... | 07/05/1983 |
| 4293799 | Power supply systems A power supply system for operating fluorescent lamps in a hazardous atmosphere comprises a 1 kHz to 500 kHz constant current power supply which feeds primary windings of transformers which are connected together in series. Fluorescent lamps are connected... | 10/06/1981 |
| 4070601 | Circuit arrangement for igniting at least one gas discharge flash tube A circuit arrangement for igniting at least one gas discharge flash tube having two main electrodes includes a chargeable flash capacitor connected in parallel with the flash tube and an electronic switch. These elements are connected to a voltage generat... | 01/24/1978 |
| 3956665 | Device for replacing a fluorescent lamp in a serially connected fluorescent lamp system A device for replacing a fluorescent lamp in a two lamp serially connected fluorescent fixture either of the type which includes a rapid-start type transformer for every two rapid-start fluorescent lamps or an instant start fixture for every two instant s... | 05/11/1976 |
| 3931543 | Starting and operating circuit for gaseous discharge lamps Circuits are disclosed for starting and operating a high pressure sodium vapor lamp in combination with another gaseous discharge lamp of low voltage breakdown characteristics. The sodium vapor lamp is connected in series with a ballast induction coil, wh... | 01/06/1976 |
