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| Number | Title | Issue Date |
| 8080944 | Ignition device An ignition circuit arrangement and method for a discharge lamp, with which there is associated a supply circuit for providing an ac supply voltage to the lamp, includes an ignition transformer which is connected to a trigger circuit on the primary side and to the l... | 12/20/2011 |
| 8076860 | Power converter and power conversion method with reduced power consumption A power converter and power conversion method converts an input AC signal to a voltage usable by a load while reducing power consumption, thereby making the converter and method suitable for a wider range of applications. A rectifier receives the AC input signal and... | 12/13/2011 |
| 7407617 | Free radical polymerization method having reduced premature termination, apparatus for performing the method, and product formed thereby A method of polymerizing by a free radical polymerization mechanism, product formed thereby, and apparatus for performing this method, are disclosed. The composition to be polymerized by the free radical polymerization mechanism is irradiated by a substantially cons... | 08/05/2008 |
| 7378800 | Starting apparatus for a high-pressure discharge lamp and high-pressure discharge lamp having a starting apparatus and operating method for a high-pressure discharge lamp A starting apparatus for a high-pressure discharge lamp provided with an auxiliary starting electrode, has a series resonant circuit for the purpose of generating the starting voltage for the high-pressure discharge lamp. The resonant inductance of the series resona... | 05/27/2008 |
| 7355300 | Solid state turbine engine ignition exciter having elevated temperature operational capability A turbine engine ignition exciter circuit applies energy stored in the exciter tank capacitor to the load (igniter plug) through a thyristor type semiconductor switching device that minimizes leakage current at elevated operating temperatures. The semiconductor swit... | 04/08/2008 |
| 7102296 | Screw-in transformer An apparatus for providing convenient transforming of electrical energy from a first voltage level to a second voltage level, includes a housing having an end wherein the end includes a conductive threading and a contact for making an electrical connection with a li... | 09/05/2006 |
| 6949885 | Discharge lamp lighting device and lighting apparatus A discharge lamp lighting device includes a discharge lamp that is lighted through an L-C resonance induced by an oscillation output of an inverter circuit. An on-off operation of switching elements of the inverter circuit is controlled by a control IC which include... | 09/27/2005 |
| 6936979 | Frequency-modulated dimming control system of discharge lamp The present invention discloses a frequency-modulated dimming control system of a discharge lamp. The frequency-modulated dimming control system of a discharge lamp includes including a voltage regulator having a variable output voltage for converting an input volta... | 08/30/2005 |
| RE38547 | Frequency-modulated converter with a series-parallel resonance A frequency-modulated converter with a series-parallel resonance, particularly for driving any ohmic or inductive load, including gas discharge tubes, wherein a commutating voltage switch in the form of a transistor is provided and is connected in series between a n... | 07/06/2004 |
| 6583586 | Brightness- regulating voltage-transforming circuit for high-pressure discharge lamp A brightness-regulating voltage-transforming circuit includes a pulse-width modulator (PWM); a transformer connected at a secondary side to a high-pressure discharge lamp; a voltage-transforming circuit having two transistors connected at bases to outputs... | 06/24/2003 |
| 6414447 | Discharge lamp lighting device and illuminating device A combination-type high frequency inverter connects an isolation leakage transformer, a smoothing condenser, a resonance condenser, a first field-effect transistor and a second field-effect transistor to a diode bridge and rectifies the voltage of an AC p... | 07/02/2002 |
| 6356033 | Light source using dielectric barrier discharge lamp, and power supply A dielectric-barrier discharge lamp light source with a dielectric-barrier discharge lamp, the light source including a discharge plasma space filled with a discharge gas in which excimer molecules are formed by dielectric-barrier discharge, two electrode... | 03/12/2002 |
| 5589739 | Hybrid ballast for high pressure discharge lamp A circuit for operating a discharge lamp includes input terminals for connection to a supply voltage source and a first apparatus coupled to the input terminals for generating a low-frequency alternating current from a supply voltage delivered by the supp... | 12/31/1996 |
| 5568018 | Fluorescent light ballast circuit An improved fluorescent light ballast circuit extends the on/off life of a florescent lamp within a lighting circuit having a pair of series connected fluorescent lamps. The ballast circuit includes a DC pulse generation circuit, filtering and voltage reg... | 10/22/1996 |
| 5561349 | Frequency-modulated converter with a series-parallel resonance A frequency-modulated converter with a series-parallel resonance, particularly for driving any ohmic or inductive load, including gas discharge tubes, wherein a commutating voltage switch in the form of a transistor is provided and is connected in series ... | 10/01/1996 |
| 5500576 | Low height ballast for fluorescent lamps An electronic ballast has a high voltage portion and a low voltage portion. The high voltage portion includes a converter, having a variable frequency boost circuit, and a half-bridge, driven inverter having a series resonant, direct coupled output. The l... | 03/19/1996 |
| 5394064 | Electronic ballast circuit for fluorescent lamps An electronic ballast circuit for multiple fluorescent lamps. Control is achieved by varying the voltage and the frequency of operation of an inverter utilized to drive the fluorescent lamps. A separate voltage boost converter provides regulated voltage t... | 02/28/1995 |
| 5159245 | Track lighting system for 277 volt power line In a track lighting system for a 277 volt power line, proper voltage for powering 120 volt incandescent lamps is obtained by way of an integral electronic transformer-less voltage conditioner. Thus, ordinary 120 volt incandescent lamps can be used directl... | 10/27/1992 |
| 5130609 | Illuminating device incorporating gas-filled chambers A light source having two potential terminals, a transformer coil having a primary incorporating two windings and a secondary transistor, the first potential terminal being connected to the first winding of the primary, which is connected to the base of t... | 07/14/1992 |
| 5115347 | Electronically power-factor-corrected ballast A fluorescent lamp is connected in parallel with the tank capacitor of a resonant L-C circuit series-excited by a 30 kHz voltage from a self-oscillating inverter. The inverter's DC supply voltage is at certain times obtained directly from unfiltered full-... | 05/19/1992 |
| 5008596 | Fluorescent lamp high frequency operating circuit To provide enhanced starting voltages for fluorescent lamps operating, for xample, from 110 V power networks through a rectifier, and in which a high-frequency oscillatory circuit is used which includes a ring core transformer (TR1, TR2, TR3) operated unde... | 04/16/1991 |
| 4868460 | Transformer dimmer circuit This invention is a circuit for controlling the power received by a load. The operation of this circuit is based on variations of voltage amplitude rather than phase as is the case with other circuits utilizing the phase control principle. A pair of termi... | 09/19/1989 |
| 4862039 | Line regulated ballast circuit The present invention relates to an improved line regulated ballast circuit for use in controlling varied lighting applications such as, for example, neon signs and fluorescent tubes. The inventive circuit, when used in neon lighting applications, may inc... | 08/29/1989 |
| 4859914 | High frequency energy saving ballast A circuit is disclosed for energizing electrical devices such as fluorescent lamps and other gas discharge luminescent devices. The circuit provides energizing signals for gaseous discharge tubes at a voltage sufficient to initiate ionization of the gases... | 08/22/1989 |
| 4818917 | Fluorescent lighting ballast with electronic assist A ballasting circuit for fluorescent lamps includes a series-connected current limiting ballast element and an electronic assist circuit. The ballast element has a high voltage side connectable to a commercial 110 VAC/60 hertz power source and a low volta... | 04/04/1989 |
| 4806830 | Device and process for lighting a fluorescent discharge lamp There is disclosed a device and process for starting up a fluorescent discharge lamp in which a high-frequency pulse is generated having narrow voltage peaks above the voltage required to start electric discharge and broad valleys, applied to the elements... | 02/21/1989 |
| 4749914 | Circuit system for igniting and operating a high-pressure discharge lamp, particularly a sodium vapor lamp A circuit system for igniting and lighting a high-pressure discharge lamp, particularly a sodium vapor lamp, comprising a pulse generator for generating signals of at least 1 kHz frequency being a high-frequency DC/AC converter connected to a direct curre... | 06/07/1988 |
| 4749913 | Operating circuit for a direct current discharge lamp A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to provide power transitioning the arc tube from its glow to it... | 06/07/1988 |
| 4716343 | Constant illumination, remotely dimmable electronic ballast A solid-state ballast for discharge lamps includes a device for sensing the instantaneous current flowing within the load to produce illumination. A signal representing this load current is differentially processed with an external control signal represen... | 12/29/1987 |
| 4700111 | High frequency ballast circuit A high frequency ballast circuit powered by a dc input voltage source for starting and operating a gas discharge lamp load, comprising: a means for providing drive signals, each the drive signal having a first and second state, a series switch having a co... | 10/13/1987 |
| 4700112 | Fluorescent lamp lighting circuit A flourescent lamp lighting circuit comprising a rectifying circuit and an oscillatory circuit. The rectifying circuit comprises a rectifier bridge, capacitors and coils to rectify the local alternating power supply to direct power supply and provide rect... | 10/13/1987 |
| 4689524 | Fluorescent lamp ballast An electronic fluorescent lamp ballast having at least an energy storing component, a controlling component which has two states, and two socket elements which enables the filaments of the fluorescent lamp to be connected in series with the energy storing... | 08/25/1987 |
| 4682082 | Gas discharge lamp energization circuit An electronic energization circuit is provided to illuminate a gas discharge lamp that includes a transformer with a substantially rectangular hysteresis loop. A secondary winding on the transformer is connected to energize the lamp and at least one prima... | 07/21/1987 |
| 4613796 | Single transistor oscillator ballast circuit 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 ... | 09/23/1986 |
| 4540917 | Pulse network for fluorescent lamp dimming A pulse network is connected to the inductive ballast of a fluorescent lamp dimmer and includes a discharge resistor in parallel with the pulse network capacitor. The resistor size is such that it will completely discharge the capacitor prior to the initi... | 09/10/1985 |
| 4523131 | Dimmable electronic gas discharge lamp ballast A two-wire electronic dimming ballast arrangement for one or more gas discharge lamps is disclosed which includes an inverter driven by a variable pulse width electric power and a control system for modulating the pulse width of the variable pulse width s... | 06/11/1985 |
| 4523128 | Remote control of dimmable electronic gas discharge lamp ballasts A remotely controlled dimming solid state ballast system for gas discharge lamps adapted to respond to external control signals is disclosed which includes the ballast itself along with integral controls for interfacing with an external addressing control... | 06/11/1985 |
| 4508996 | High frequency supply system for gas discharge lamps and electronic ballast therefor The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high... | 04/02/1985 |
| 4503362 | Frequency stabilized, gain controlled ballast system A frequency stabilized automatic gain controlled ballast system (10) which is coupled to a power source (12) in order to operate at least one of a pair of gas discharge tubes (40 and 40'). Each of the gas discharge tubes (40, 40') include respective filam... | 03/05/1985 |
| 4500813 | Lighting system A lighting system (11) utilizes a high intensity quartz halogen bulb (12) surrounded by a spaced dome (18) to permit substantially spherical radiation of luminous energy for general area illumination. A control mechanism (41) responds to a remotely locate... | 02/19/1985 |
