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| Number | Title | Issue Date |
| 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 |
| 7061183 | Zigzag topology for balancing current among paralleled gas discharge lamps 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, and efficient. Embodiments include configura... | 06/13/2006 |
| 7002304 | Multi-lamp drive device A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound aroun... | 02/21/2006 |
| 5854539 | Electroluminescent lamp driver circuit with signal tracking An electroluminescent lamp is driven by a driving circuit that can supply an approximately sinusoidal signal, a bi-directional sawtooth signal or a single-ended sawtooth signal. Switches selectively transfer energy from a battery to an inductor and then f... | 12/29/1998 |
| 5446350 | Impedance matching circuit for an electrodeless fluorescent lamp ballast An impedance matching circuit for a self-oscillating electrodeless fluorescent lamp ballast of the type having an inductor connected in series with the parallel combination of a capacitor and the lamp's drive coil includes an additional capacitor connecte... | 08/29/1995 |
| 5276385 | High-pressure discharge lamp and lighting method The invention provides a high-pressure discharge lamp incorporating an outer envelope storing a pair of electric terminals a plurality of arc tubes which are respectively stored in this outer envelope and electrically connected in parallel, and a pluralit... | 01/04/1994 |
| 5036255 | Balancing and shunt magnetics for gaseous discharge lamps In accordance with the present invention, a control device for energizing a lamp circuit including gaseous discharge lamps includes a power source having a variable amplitude varying in time. A control circuit is provided for producing a variable pulse wi... | 07/30/1991 |
| 4996463 | Auxiliary lighting system for high intensity discharge lamp An auxiliary lighting system to be used with a high intensity discharge lamp having a solid state or electronic ballast. An auxiliary lamp is connected to a source of power through the normally closed contacts of a relay. The relay coil is in the input li... | 02/26/1991 |
| 4931699 | Ballast system including a starting aid for a gaseous discharge lamp This ballast system for a gaseous discharge lamp comprises a reactor coil and core structure forming a magnetic circuit for flux developed by power-frequency current through the coil during lamp operation. The core comprises a leg surrounded by the reacto... | 06/05/1990 |
| 4902943 | Plug-in starting aid A plug-in starting aid for generating high voltage pulses in the ballast circuit of high intensity discharge lamp comprises interconnected electrical components mounted in a frame of insulating material. The frame has three terminals projecting out one si... | 02/20/1990 |
| 4654563 | Fluorescent lamp ballast A circuit containing a ballast for one or more fluorescent lamps. The circuit includes a first inductor in series with a voltage input terminal and a first capacitor to form a series resonant circuit to provide a starting voltage to the lamps. A second, s... | 03/31/1987 |
| 4392089 | Isolator for use with frequency responsive switching circuit A frequency responsive power control system includes an improved isolator in series electrical connection with respect to a ballasted lamp load. The isolator has a high inductive impedance at low current for blocking ballast induced noise signals from int... | 07/05/1983 |
| 4323823 | Unitary ballast structure for operating four fluorescent lamps Unitary ballast structure for starting and operating four fluorescent lamps comprising stacked magnetic iron laminations and coils retained thereon to provide two separate inductor means and a transformer means for heating multiple lamp electrode coils. T... | 04/06/1982 |
| 4190790 | Isolator circuit for use with frequency sensitive switching circuit An isolator circuit for use with a switching circuit for energizing a ballasted load in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. In the switching circuit, a triac is gated to conduct th... | 02/26/1980 |
| 4163925 | Two-wire ballast for fluorescent tube dimming A two-wire ballast arrangement is disclosed for fluorescent tubes having first and second terminals for supplying variable power to dim the fluorescent tube, a choke coil connected between the first terminal and the fluorescent tube and a filament transfo... | 08/07/1979 |
| 4123690 | Discharge lamp ballast circuit Electrical ballast circuit of improved power factor for operating gaseous discharge lamps. Two discharge lamps are respectively connected to two inductively coupled induction coils for obtaining high power factor without the use of capacitors.... | 10/31/1978 |
| 3997814 | Discharge lamp lighting device A discharge lamp lighting device minimized in dimensions and capable of lighting a discharge lamp with a source voltage close to discharge lamp voltage is provided. The device comprises an alternating current source, a discharge lamp connected in series w... | 12/14/1976 |
| 3991344 | Solid-state dimmer for dual high pressure discharge lamps A lighting control apparatus to provide variable intensity light from high pressure discharge lamps using two high pressure discharge lamp loads connected in series to provide more widely variable intensity of light. The outputs of two ballasts may be con... | 11/09/1976 |
| 3989976 | Solid-state hid lamp dimmer Lighting control apparatus for controlling the light intensity of high-intensity-discharge (HID) lamps operated from an AC source while eliminating the tendency for such lamps to extinguish during the dimming thereof. The apparatus comprises a variable re... | 11/02/1976 |
| 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 |
