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| Number | Title | Issue Date |
| 8125159 | LED driving device with variable light intensity In a device for driving LEDs with variable light intensity, a supply stage has a first operating mode, in which a controlled supply current is generated, and a second operating mode, in which a controlled supply voltage is generated. A LED is connected to the supply... | 02/28/2012 |
| 8004204 | Power circuit and illumination apparatus A series load circuit is a circuit formed by connecting a light-emitting device unit 851 (the first load circuit) and a light-emitting device unit 852 (the second load circuit) in series. A voltage generating circuit 111 generates voltage to be ... | 08/23/2011 |
| 7944151 | Frequency modulation method and device for high intensity discharge lamp An electronic control gear for a HID lamp receives an input signal for operating the lamp and frequency modulates the input signal to generate a frequency modulated output signal that drives an arc of the lamp. The frequency modulation of the output signal sweeps co... | 05/17/2011 |
| 7888880 | Dielectric barrier discharge lamp system and driving method thereof having relatively better performance in startup and re-startup of dimming The configurations of a dielectric barrier discharge lamp (DBDL) system and the driving method thereof are provided in the present invention. The proposed DBDL system includes a driver circuit receiving a DC input voltage and generating an AC output voltage, includi... | 02/15/2011 |
| 7710046 | Balance coil and inverter for driving backlight Provided is an inverter for driving a backlight such as LCD, wherein the inverter includes a driving circuit for driving at least two of a plurality of lamps; a transformer for connecting the driving circuit to the plurality of lamps; and a balance coil connected to... | 05/04/2010 |
| 7667410 | Equalizing discharge lamp currents in circuits Methods and apparatus are disclosed for balancing currents passing through multiple parallel circuit branches and in some cases through parallel fluorescent lamps. Single transformers with multiple-leg magnetic cores are wound in specific manners that simplify curre... | 02/23/2010 |
| 7638952 | Multiple discharge lamp lighting apparatus A multiple discharge lamp lighting apparatus includes first and second transformers and a bridge circuit configured such that four branch paths each including a discharge lamp are connected to form a quadrangle with four sides constituted by the four branch paths, w... | 12/29/2009 |
| 7592753 | Inductively-powered gas discharge lamp circuit An inductively powered gas discharge lamp assembly having a secondary circuit with starter circuitry that provides pre-heating when power is supplied to the secondary circuit at a pre-heat frequency and that provides normal operation when power is supplied to the se... | 09/22/2009 |
| 7586268 | Apparatus and method for controlling the filament voltage in an electronic dimming ballast An electronic dimming ballast comprises a filament turn-off circuit for controlling the magnitudes of filament voltages supplied to the filaments of a gas discharge lamp. Each of a plurality of filament windings is directly coupled to one of the filaments and is ope... | 09/08/2009 |
| 7557516 | Resonant inverter The present invention provides a low-cost inverter for ballast. A current transformer is connected in series with a lamp to operate the lamp. A first transistor and a second transistor are coupled to switch the resonant circuit. The current transformer is utilized t... | 07/07/2009 |
| 7531967 | Flashlamp drive circuit The invention provides a power supply or drive circuit for a pulsed flashlamp which utilizes a two-core component having common windings as both an inductor for arc mode drive and for breakdown triggering of the lamp. Discharge of a capacitor through the inductor an... | 05/12/2009 |
| 7439689 | Lamp driving device having impedance component detecting abnormal discharge In one aspect, an impedance component which exhibits a high impedance in a high frequency region is arranged on a high pressure line formed on a secondary side of a transformer. The potential difference generated at both ends of the impedance component is used to de... | 10/21/2008 |
| 7436129 | Triple-loop fluorescent lamp driver A driver circuit provides electrical energy from a power source to a fluorescent lamp such as that used in a flat-panel or other liquid crystal display (LCD). The circuit includes a transformer having a primary winding and a secondary winding, with the ends of the s... | 10/14/2008 |
| 7432666 | Cold cathode fluorescent lamp driving system A CCFL (cold-cathode fluorescent lamp) driving system for digitally driving at least one CCFL, according to embodiments of the present invention, generally includes a transformer, a sense circuit and a CCFL controller. Through the transformer, a DC voltage is suppli... | 10/07/2008 |
| 7397198 | Fluorescent lamp driver and liquid crystal display apparatus In order to suppress leak current at the time of high voltage application to a fluorescent lamp so as to improve the luminous efficiency, the present invention provides a fluorescent lamp driver, which includes switching means that switches a DC power supply voltage... | 07/08/2008 |
| 7397196 | Circuit arrangement for preventing high peak currents A driver for HID lamps includes four switches and generates a constant DC-current that is commutated at a low frequency. The driver includes a filter capacitor. The occurrence of peak currents due to the charging or discharging of the filter capacitor is prevented b... | 07/08/2008 |
| 7391165 | Discharge lamp lighting control device A discharge lamp lighting control device (100) having a DC power converter, a power factor improving power converter (1), a polarity reversing circuit (2), a starter circuit (3), and a controller (4). The power factor improving pow... | 06/24/2008 |
| 7378802 | Discharge lamp lighting circuit A circuit includes a transformer 7 for transmitting power to a discharge lamp 10 and for supplying a starting signal to the discharge lamp. The circuit includes a direct current-alternating current converting circuit 3 for supplying an output of... | 05/27/2008 |
| 7372212 | Lamp, method of driving the lamp, backlight assembly and liquid crystal display device having the backlight assembly A lamp, a method of driving the lamp, a backlight assembly having the lamp, and a liquid crystal display (LCD) device having the backlight assembly are disclosed. The lamp includes a tube that contains gas and first through fourth electrodes. The first and second el... | 05/13/2008 |
| 7368881 | Discharge lamp lighting apparatus and lamp system using the lighting apparatus In a discharge lamp lighting apparatus, a power supplied to a discharge lamp La through a DC-DC converter 1 and an inverter 2 is controlled depending on detection results of a lamp voltage detection unit 6 and a lamp current detection unit 7 | 05/06/2008 |
| 7365500 | Display device having lamp control circuit A driving device is provided, which includes: a switching unit directly connected to a first voltage from a source external to the driving device; a transforming unit indirectly connected to the switching unit for transforming the first voltage into a second voltage... | 04/29/2008 |
| 7352140 | Master-slave control architecture for inverters A master-slave control architecture for inverters includes a master control circuit board which has a master control unit to output a plurality of frequency signals of the same phase and same frequency so that driving units on a plurality of separated slave control ... | 04/01/2008 |
| 7348735 | Lamp driver An electronic device for starting and/or re-starting a power-driven device such as a lamp, bulb or lighting fixture includes an input stage, a rectifier stage, a power factor correction stage with total harmonic distortion correction, and a coil device comprising a ... | 03/25/2008 |
| 7339322 | Apparatus and methods for making spectroscopic measurements of cathode fall in fluorescent lamps Apparatus and methods are disclosed for measuring cathode fall within a fluorescent lamp that contains an electrode and a gas. A level of cathode fall associated with the electrode may be identified based on an intensity and wavelength of radiation emitted by the ga... | 03/04/2008 |
| 7332874 | Discharge lamp ignition device To provide a discharge lamp ignition device to light high-intensity discharge lamps in which, during alternating current ignition, the fluctuation of luminous flux on the reversal of polarity of the voltage impressed on the lamp is minimized and in which steady ligh... | 02/19/2008 |
| 7332868 | Discharge lamp lighting device The present discharge lamp lighting device is capable of rapid modulation in which a lamp current is rapidly reduced and rapidly restored. The current control circuit is provided to perform specific current control such that the brightness of a lamp is reduced by a ... | 02/19/2008 |
| 7332873 | Electrical circuit for fluorescent lamps A portable fluorescent task lamp comprising at least two fluorescent bulbs of any wattage up to forty Watts and of either a non-starting type or a self-starting type; and an electronic ballast circuit for use therewith including an SPST function switch disposed in s... | 02/19/2008 |
| 7327094 | Circuit arrangement and method for operating at least one electric lamp The present invention relates to a circuit arrangement for operating at least one electric lamp (LP) having a drive circuit (16), which has at least one terminal for a system voltage (UN) on the input side and at least one terminal for the at least... | 02/05/2008 |
| 7323877 | Apparatus and methods for making spectroscopic measurements of cathode fall in fluorescent lamps Apparatus and methods are disclosed for measuring cathode fall within a fluorescent lamp that contains an electrode and a gas. A level of cathode fall associated with the electrode may be identified based on an intensity and wavelength of radiation emitted by the ga... | 01/29/2008 |
| 7321205 | Method and a controller to control power supply to a CCFL A CCFL (cold-cathode fluorescent lamp) driving system for digitally driving at least one CCFL, according to embodiments of the present invention, generally includes a transformer, a sense circuit and a CCFL controller. Through the transformer, a DC voltage is suppli... | 01/22/2008 |
| 7319296 | Device for driving lamps A driving device for driving a plurality of lamps each including a first terminal and a second terminal, includes a power stage circuit (202), a transformer circuit (204) electrically connectable to the power stage circuit, and a current balancing circ... | 01/15/2008 |
| 7315136 | Protection apparatus and multi-lamp driving system using the same A multi-lamp driving system includes a driving apparatus and a current balancer having detection nodes. The protection apparatus includes at least a detection unit and a determining unit. The detection unit includes first impedance devices and a second impedance dev... | 01/01/2008 |
| 7312587 | Control device for high intensity discharge bulb and method of controlling high intensity discharge bulb Two types of rectangular waves having different numbers of driving pulses are applied to the HID bulb. By changing the combination of these two different types of rectangular waves to be supplied , the driving energy of the HID bulb is increased or decreased, thereb... | 12/25/2007 |
| 7310246 | Capacitor charging circuit and strobe apparatus comprising same A capacitor charging circuit does not include a Zener diode and makes it possible to integrate a large number of circuits and elements within a semiconductor integrated circuit. The capacitor charging circuit includes a flyback transformer having a primary coil, a s... | 12/18/2007 |
| 7307388 | Backlight modules and lamp modules in flat panel displays A lamp module for use in a backlight module of a flat panel display comprises a first transformer, a second transformer, a plurality of first lamps and a plurality of second lamps. The first transformer provides an AC power of a first phase, and the second transform... | 12/11/2007 |
| 7304441 | Method and apparatus for driving discharge lamps in a floating configuration A technique is described that facilitates sensing current through a load. A method according to the technique includes mounting a discharge lamp in a floating point configuration, sensing current through the discharge lamp, and controlling current through the discha... | 12/04/2007 |
| 7298097 | Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp System and method for driving a cold-cathode fluorescent lamp. The system includes a control subsystem configured to generate one or more control signals, and a power supply subsystem configured to receive the one or more control signals and a DC input voltage, conv... | 11/20/2007 |
| 7288897 | Circuit arrangement for operating at least one high pressure discharge lamp A circuit arrangement for operating at least one high-pressure discharge lamp having four switches in a full bridge arrangement, a first and a second switch forming the first half-bridge arm, and a third and a fourth switch forming the second half-bridge arm, at lea... | 10/30/2007 |
| 7288901 | Ballast with arc protection circuit A ballast (20) for powering one or more gas discharge lamps (70,72,74,76) comprises an inverter (200), an output circuit (300), and an arc protection circuit (400). Arc protection circuit (400) monitors an electrical signal ... | 10/30/2007 |
| 7279852 | Apparatus and method for striking a fluorescent lamp A lamp inverter with continuous strike voltage facilitates faster striking of a fluorescent lamp, especially at cold temperatures. A frequency sweep generator sweeps the frequency of the lamp inverter to a striking frequency corresponding to a striking lamp voltage ... | 10/09/2007 |
