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| Number | Title | Issue Date |
| 8120262 | Driving circuit for multi-lamps A circuit is used for driving a plurality of lamps, such as Cold Cathode Fluorescent Lamps (CCFLs). The lamps are paired to form a plurality of pairs of lamps. Each of the plurality of pairs of lamps has two lamps which are coupled to each other in series. The plura... | 02/21/2012 |
| 8072151 | Inverter circuit An inverter circuit (20) includes a transformer (T2) including a primary winding and a secondary winding including a high voltage terminal, a first copper foil (P21), a power stage circuit (21) electrically connected to the primary windin... | 12/06/2011 |
| 7977888 | Direct coupled balancer drive for floating lamp structure A backlighting arrangement constituted of a driving transformer arrangement; a plurality of lamp pairs, each of the constituent lamps of the plurality of lamp pairs exhibiting a first electrical connection and a second electrical connection; and a plurality of balan... | 07/12/2011 |
| 7852008 | Dielectric barrier discharge lamp lighting device A dielectric barrier discharge lamp lighting device includes a transformer that supplies a driving voltage to a dielectric barrier discharge lamp from a secondary coil, and a driving circuit that controls an input voltage to the transformer to supply a driving volta... | 12/14/2010 |
| 7696699 | Lamp base for a high-pressure discharge lamp and corresponding high-pressure discharge lamp A lamp base (2) for a high-pressure discharge lamp comprises an ignition transformer (1000), which is placed in the interior (214) of the lamp base (2) and which serves to ignite the gas discharge inside the high-pressure discharge lamp. ... | 04/13/2010 |
| 7557513 | Discharge lamp lighting circuit A lighting circuit includes a capacitor and inductor for a resonance, and a first output, a second output, a resistor and a monitor circuit. A DC-AC converting circuit generates an AC voltage from a DC voltage. The resistor has an end connected to the second output ... | 07/07/2009 |
| 7557514 | Inverter driving circuit While series resonant circuits 51 to 53 are connected to an output stage of a switching circuit 101 so as to be parallel mutually, primary sides of booster transformer sections 1 to 3 are connected to resonance capacitors 14... | 07/07/2009 |
| 7368880 | Phase shift modulation-based control of amplitude of AC voltage output produced by double-ended DC-AC converter circuitry for powering high voltage load such as cold cathode fluorescent lamp A double-ended, DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and... | 05/06/2008 |
| 7301122 | Inline spark gap assembly A spark gap point and spark gap assembly for a welding-type device are disclosed for igniting and stabilizing a welding-type arc. A double-headed spark gap point having spark gap surfaces on two ends is incorporated into a spark gap assembly with a pair of single-he... | 11/27/2007 |
| 7294971 | Balancing transformers for ring balancer A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondar... | 11/13/2007 |
| 7274156 | Power supply circuit and transformer thereof A power supply circuit for a first and a second lamps and the transformer thereof is provided. The power supply circuit comprises a driving circuit and a transformer. The transformer includes a magnetic core, a primary coil set, a secondary coil, a first coil and a ... | 09/25/2007 |
| 7268500 | Control device for multiple lamp currents of liquid crystal display backlight source A control device for multiple lamp currents of a liquid crystal display (LCD) backlight source, comprising an electronic power switch, a transformer, an inverter and an integrated circuit (IC) feedback control module. The transformer has a primary side connected to ... | 09/11/2007 |
| 7250731 | Primary side current balancing scheme for multiple CCF lamp operation A backlight system drives multiple lamps using balanced groups of serially-connected lamp transformers. A plurality of lamp transformers is divided into multiple transformer groups. Primary windings of the lamp transformers are coupled in series in each transformer ... | 07/31/2007 |
| 7242147 | Current sharing scheme for multiple CCF lamp operation A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondar... | 07/10/2007 |
| 7233078 | Miniature hydro-power generation system A miniature hydro-power generation system may produce electric power from a flow of liquid. The miniature hydro-power generation system may include a housing that includes a plurality of paddles positioned to extend outwardly from an outer surface of the housing. Th... | 06/19/2007 |
| 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 |
| 7130180 | Partitioned exciter system A partitioned exciter system for use with an igniter in an aircraft engine. The exciter has low-energy charging circuit and a high-energy discharge circuit that are remotely located from each other and that are connected by a low-energy coaxial cable. The charging c... | 10/31/2006 |
| 7119451 | Self-powered miniature liquid treatment system with ultraviolet dosing A liquid treatment system that may be self-powered includes a filter, an ultraviolet light source and a hydro-generator. A flow of liquid may be filtered with the filter and used to rotate the hydro-generator to generate electric power. The ultraviolet light source ... | 10/10/2006 |
| 7067936 | Self-powered miniature liquid treatment system with multiple liquid flow paths A liquid treatment system that may be self-powered includes a filter, an ultraviolet light source and a hydro-generator in a first flow path. The first flow path may provide treated liquid at a first outlet of the liquid treatment system. A second flow path included... | 06/27/2006 |
| 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 |
| 6570341 | Electromagnetic ballast for serially connected gaseous discharge lamps Apparatus for sequentially igniting and serially operating a pair of high output rapid start fluorescent lamps from a source of AC voltage. The apparatus includes a transformer with a primary winding that may be subdivided in two sections, a principal sec... | 05/27/2003 |
| 6552494 | Fluorescent lamp driver circuit Herein described is a driver circuit of a fluorescent lamp having a first and a second electrode and igniting when the voltage between the first and second Electrode exceeds a given threshold voltage. The driver circuit comprises an inductance coupled to ... | 04/22/2003 |
| 6534929 | Electromagnetic ballast for sequentially starting a plurality of a gaseous discharge lamps An electromagnetic ballast for sequentially starting and simultaneously operating first and second gaseous discharge lamps includes a transformer having a magnetic core, a primary winding for connection to an AC voltage source and first and second seconda... | 03/18/2003 |
| 6201352 | Cold cathode fluorescent display A monochromic, multi-color and full-color cold cathode fluorescent display (CFD), comprises of: some shaped white or multi-color or red, green, blue three primary color cold cathode fluorescent lamps (CCFL), reflector, base plate, temperature control mean... | 03/13/2001 |
| 6191538 | High-pressure discharge lamp having a base at one end and a starting device integrated in the base The invention relates to a high-pressure discharge lamp having a base at one end and whose return conductor (13) is protected with the aid of a bidirectional trigger (D) against high induced voltages of the radio interference suppression reactor (L1) conn... | 02/20/2001 |
| 4890041 | High wattage HID lamp circuit A lamp start, hot-restart and operating circuit for a high wattage, high intensity discharge lamp includes cascaded resonant circuits with capacitors and series-connected inductors connected to an AC source. A pulse circuit including two pulse transformer... | 12/26/1989 |
| 4795945 | Starting circuit for high intensity gaseous discharge lamps A circuit for starting, operating and instant hot restarting of high intensity gaseous discharge lamps utilizes a conventional ballast, an ignition transformer and a pulse transformer. The ignition transformer is connected across the ballast output and is... | 01/03/1989 |
| 4694224 | Lighting apparatus for an electric discharge lamp A lighting apparatus for an electric discharge lamp includes a lighting ballast capacitor connected in series to an electric dicharge lamp for stabilizing a lighting current to the lamp; a preheating ballast capacitor connected in parallel to the lamp for... | 09/15/1987 |
| 4683404 | Starting circuit and apparatus for high pressure sodium lamps A lighting apparatus which provides high voltage pulses for starting a high pressure sodium lamp. The apparatus includes two capacitors, two blocking diodes, a voltage sensitive symmetrical switch, and multiple resistances across which pulses are distribu... | 07/28/1987 |
| 4525649 | Drive scheme for a plurality of flourescent lamps 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 compri... | 06/25/1985 |
| 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 |
| 4475062 | Economy device for fluorescent lighting fixtures A device is disclosed for converting fluorescent lighting fixtures, having a conventional series-type ballast with at least two lamps, to effect illumination of only one of the two lamps at a time, but automatically effecting illumination of the other lam... | 10/02/1984 |
| 4435670 | Energy conserving instant-start series-sequence fluorescent lamp system with overcurrent protection An energy-saving instant-start series-sequence fluorescent lamp system includes power-reducing capacitor means connected in series circuit arrangement with one or both lamps in a two-lamp system. A protective device is connected in circuit with a first la... | 03/06/1984 |
| 4415837 | Starting circuit for gaseous discharge lamps A starting circuit for a high intensity discharge lamp. To provide the high voltage necessary for starting the lamp, the circuit uses a tapped transformer feeding a resistance-capacitance charging network coupled across the lamp. A voltage sensitive symme... | 11/15/1983 |
| 4392081 | Lighting unit A lighting unit is described utilizing an energy efficient metal vapor arc lamp as the main source of light supplemented by a standby filamentary light source producing light when the arc lamp is being started. The lighting unit is designed as a more effi... | 07/05/1983 |
| 4348615 | Discharge lamp operating circuit A lamp operating circuit comprising a DC power source, an inverter including step-up transformer inductance windings and a controlled transistor switch connected across the output of the DC source, and a high frequency oscillator coupled to the transistor... | 09/07/1982 |
| 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 |
| 4023067 | Inverter ballast circuit An inverter circuit suitable for use as a fluorescent lamp inverter ballast is disclosed. The inverter has the capability of starting the fluorescent lamp through regenerative feed-back techniques made possible by the amplification characteristic of the i... | 05/10/1977 |
| 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 |
