|7276859||Three-phase electronic ballast with improved three-phase EMI filter|
A ballast (20) for powering at least one gas discharge lamp (52) from a three-phase AC voltage source (30) comprises a three-phase rectifier circuit (200), a high frequency filter capacitor (300), a high frequency inverter (400
|6346782||Multiple lamp ballast system|
A multiple lamp instant start ballast system has multiple fluorescent lamps and a ballast. The lamps have substantially similar current characteristics. The ballast has a ballast circuit operable to supply instant start starting voltages and operating cur...
|6078146||Centralized power reducing device, particularly for lighting installations|
Disclosed herein is a centralized power reducing device, particularly for lighting installations, comprising, on each phase of the installation power source, a winding (16) in series with load (10), wound on a magnetic core (18), the current supplied to l...
|5815067||Single control wire device for HID dimming|
A dimming control for a high intensity lighting system uses a single additional control wire for control of the dimming function. The lighting system operates on multi-phase power. A transmitter for transmitting a control signal over the single control wi...
|5661368||Dual-voltage control for an electrical load|
In one embodiment of the present invention, a daytime running lamp (DRL) system for a motor vehicle includes a switchable connection from the headlamps of the vehicle to the neutral connection of the vehicle's alternator. Compared with the full system vol...
|5440206||Plasma processing apparatus comprising means for generating rotating magnetic field|
In a plasma processing s including a processing chamber and plate-parallel electrodes, provided in the processing chamber, for generating a high-frequency electric field in response to a high-frequency voltage, a ring-shaped core is provided in the periph...
|5391965||Gas discharge ignition device and method using high frequency and high power to ignite a uniform electrode surface area|
A device and method for establishing and maintaining a gas discharge extending essentially through the entire space between electrodes which face each other. The gas discharge is obtained by providing on at least one of the surfaces of the electrodes faci...
|4833577||Light source in a subdivided arrangement|
A light source having a single glass bulb housing and a multiple of three electrically interconnected fluorescent tubes. The tubes are located outside of the focal point of a smooth curved mirror. The phases of the fluorescent bulbs are electrically overl...
|4733136||Method of regulating the power of vapor discharge lamps|
During operation of ionized vapor discharge lamps and the partial load range, the lamp current is reduced from the rated value, the drop in voltage is measured during and after the reduction of the lamp current, and when the period of constant voltage tha...
|4517495||Multi-electrode plasma source|
A multi-electrode plasma source for maintaining a plasma loop for heating a stream of sample material traveling along a predetermined path through the loop. Included is at least one set of at least three spaced-apart electrodes having tips circumferential...
|4502145||Power supply for a laser|
An improved gas laser is disclosed. The laser has a support tube to support and to maintain the alignment of the optical resonator structure. The gas lasing medium is used within the support tube to maintain the tube at a substantially constant temperatur...
|4207498||System for energizing and dimming gas discharge lamps|
An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces an output voltage at a high frequency which can be about 23 kHz. The amplitude of the inverter output is adjustable to dim the lamp...
|4041351||Flash lamp power supply with direct energization from an AC power supply source|
A method of energizing a laser source stimulating flash lamp directly from an AC power line. Uncontrolled diodes couple the anode and cathode of the flash lamp directly to the AC line. The lamp is triggered by a separate triggering circuit which produces ...