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| Number | Title | Issue Date |
| 8084954 | Lamp driving circuit The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer. The lamp driving circuit in accordance with the present invention includes a rectification unit for rectifying an i... | 12/27/2011 |
| 7859195 | Apparatus for controlling lamp driving and light unit having the same Provided are an apparatus for controlling a lamp driving, and a light unit. The apparatus comprises a trans-portion, a plurality of lamps, a first cable, and a current attenuator. The trans-portion outputs a first AC power and a second AC power. The plurality of lam... | 12/28/2010 |
| 7560872 | DC-AC converter having phase-modulated, double-ended, half-bridge topology for powering high voltage load such as cold cathode fluorescent lamp A phase-modulated, double-ended, half-bridge topology-based 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 sinus... | 07/14/2009 |
| 7439686 | Discharge-lamp lighting apparatus A discharge-lamp lighting apparatus includes first and second cold cathode fluorescent lamps (CCFLs) and first and second transformers. The first transformer has a primary winding and a secondary winding. The primary winding receives an AC voltage generated by turni... | 10/21/2008 |
| 7394213 | Multi-lamp driver A multi-lamp driver t disclosed, comprising a power driver coupled to a plurality of lamps to supply power thereto, a feedback circuit coupled to at least one of the lamps to generate a feedback signal, a control circuit coupled between the feedback circuit and the ... | 07/01/2008 |
| 7388334 | High frequency electronic ballast with sine wave oscillator A high frequency sinusoidal wave is generated and applied directly to a gas discharge lamp in multiple phases in a power efficient electronic ballast. Uniting a high frequency current fed oscillator with a transformer, where direct current may be applied to the cent... | 06/17/2008 |
| 7372211 | Cold cathode tube lighting device and driving method and integrated circuit to be used in same A cold cathode tube lighting device is provided which is capable of obtaining stable luminance when a cold cathode tube is driven by applying voltages to input terminals on both ends of the cold cathode tube. A first current flowing through each of transformer secon... | 05/13/2008 |
| 7294972 | Feedback circuit for push-pull inverters A feedback circuit for push-pull inverters aims to improve the existing push-pull inverters that provide input electricity to a discharge lamp at a phase difference of 180 degrees without feedback electricity to regulate frequency signals and cannot effectively cont... | 11/13/2007 |
| 7279851 | Systems and methods for fault protection in a balancing transformer 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 ... | 10/09/2007 |
| 7279849 | Apparatus for driving backlight of liquid crystal display This invention relates to a backlight driving apparatus of a liquid crystal display device, and more particularly to a backlight driving apparatus of a liquid crystal display device that includes: first and second transformers that boost an AC voltage to a boosted A... | 10/09/2007 |
| 7250726 | Systems and methods for a transformer configuration with a tree topology for current balancing in 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, efficient, and good performing. Embodiments ... | 07/31/2007 |
| 7239092 | Limited open circuit voltage ballast A lighting system employs a pair of ballast input stages (21) operable to oscillate at different oscillating frequency (f1, f2) upon an initial powering of the ballast input stages (21). The lighting system further employs a pair of balla... | 07/03/2007 |
| 7230390 | Cold cathode fluorescent lamp assembly A cold cathode fluorescent lamp (CCFL) assembly includes a pair of CCFLs, and an inverter-type drive circuit. The drive circuit includes a first transformer having a primary winding adapted to be coupled to a power supply module, and a secondary winding with a pair ... | 06/12/2007 |
| 7173379 | Incremental distributed driver An incremental distributed driver divides power delivered to multiple lamps into two power delivery stages. The first power delivery stage operates in voltage-mode to provide a partial operating voltage to the lamps. The second power delivery stage operates in curre... | 02/06/2007 |
| 7166969 | Drive circuit for illumination unit In case of driving a plurality of lamps with the use of a plurality of output transformers, a difference in the bright-ness of each lamp occurs by a dispersion of characteristics of the output transformers, and an object is to prevent such troubles. For this purpose... | 01/23/2007 |
| 7126289 | Protection for external electrode fluorescent lamp system The present invention provides a driving circuit with protection function for driving a set of external electrode fluorescent lamps (EEFL). The drive circuit includes a transformer connected to the set of EEFLs, a switching network connected to the transformer which... | 10/24/2006 |
| 7081709 | Method and apparatus for lighting a discharge lamp A reliable and efficient circuit for lighting a discharge lamp is described. An inverter accepts a direct current supply voltage and outputs an alternating current lamp voltage to drive the discharge lamp at a relatively high frequency. In one embodiment, the invert... | 07/25/2006 |
| 7081717 | Discharge lamp lighting apparatus for lighting multiple discharge lamps A discharge lamp lighting apparatus for lighting a plurality of discharge lamps comprises: a control circuit adapted to output driving signals; a plurality of step-up transformers; and a plurality of bridge circuits, each of which is connected to a DC power supply, ... | 07/25/2006 |
| 6870326 | Fluorescent ballast with isolated system interface A ballasting circuit is configured with a circuit having a capability of providing an isolated power supply to various external ballast accessories that interface with a circuit or device for determining the amount of illumination. The ballasting circuit also has a ... | 03/22/2005 |
| 6661181 | Backlight assembly and liquid crystal display device having the same A connection of electrode lines of lamps for supplying a light source for a backlight assembly of a liquid crystal display (LCD) device is improved to minimize the size of the LCD device while reducing the manufacturing cost. The LCD device includes the b... | 12/09/2003 |
| 6617807 | Discharge lamp lighting circuit for a plurality of discharge lamps In a discharge-lamp lighting circuit for turning on a plurality of discharge lamps, starting circuits 8 for supplying starting pulses to the respective discharge lamps are provided. Each starting circuit 8 has transformers T1 and T2 equal in number to the... | 09/09/2003 |
| 6515427 | Inverter for multi-tube type backlight The inverter for multi-tube type backlight includes two step-up transformers of one-side grounded type, wherein the two step-up tranformers respectively output electric power to one or a plurality of cold cathode tubes, and wherein outputs of the two step... | 02/04/2003 |
| 5861718 | ARC lamp igniter apparatus and method An arc lamp igniter circuit (10) employs a resonant inverter circuit (16) to convert low-voltage DC to a relatively high-voltage, 80 kilohertz sinusoidal AC voltage that is rectified and voltage-doubled (42, 44, 46) to about 2,500 volts DC for repetitivel... | 01/19/1999 |
| 5742132 | Method and system for starting and operating a discharge lamp To effectively suppress glow discharge of a discharge lamp, especially a h-pressure discharge lamp, immediately after starting or firing, the lamp is supplied in a second, or run-on phase with a run-up current which has a form factor F greater than one (... | 04/21/1998 |
| 5444334 | System for starting a high intensity discharge lamp A ballast circuit arrangement with hot restrike capabilities includes an input transformer having a primary winding receptive of line power and a secondary winding over which an output voltage is made available. A first capacitor coupled across the second... | 08/22/1995 |
| 5386181 | Swept frequency switching excitation supply for gas discharge tubes The present invention describes a method and apparatus for a swept frequency switching gas discharge tube supply which produces a "crawling effect" in gas discharge tubes containing neon, argon or mercury gases or other gases and which has a means for eli... | 01/31/1995 |
| 5332951 | Circuit for driving gas discharge lamps having protection against diode operation of the lamps A circuit for driving gas discharge lamps has a bandpass filter coupled between the output of the inverter and the inverter control. The bandpass filter provides protection against the diode operation of the gas discharge lamps. The bandpass filter is com... | 07/26/1994 |
| 5309350 | Push-pull inverter Here is disclosed a push-pull inverter used to drive a cold cathode discharge tube, a hot cathode discharge tube and the like, comprising a boosting transformer having a first primary coil, a first secondary coil, a second primary coil and a second second... | 05/03/1994 |
| 5099407 | Inverter with power factor correction circuit The inverter circuitry requires minimal operating input power, is power factor correcting and may, if desired, include a dimming circuit. The circuitry further includes a runaway protection circuit which is activated upon sensing of a no load condition to... | 03/24/1992 |
| 5084653 | Power-line-isolated dimmable electronic ballast In an electronic ballast for powering three series-connected fluorescent lamps with a 30 kHz lamp current, a half-bridge series-resonance-type inverter circuit is powered from a substantially constant-magnitude DC supply voltage derived from ordinary 60 H... | 01/28/1992 |
| 5081399 | Power supply systems for neon lights A main power supply device uses single phase, or three phase R, S, T; through rectification and filtration; each phase produces a different D.C. voltage so as to supply a respective voltage transforming device. The rectifier output of a step-down supply o... | 01/14/1992 |
| 5053681 | Remote electrical converter A circuit, including an electrical load such as a fluorescent lamp, energized through an inverter which is in turn energized from a standard household alternating current voltage source. The output of the inverter is of a low voltage, low current and high... | 10/01/1991 |
| 5045760 | Neon sign transformer A neon sign transformer for operating a neon tube from a mains frequency alternating current comprising: a filter for filtering electro-magnetic interference from said alternating current; a first rectifier for rectifying said filtered alternating current... | 09/03/1991 |
| 4958109 | Solid state ignitor The ignitor is a high voltage power supply for intermittent operation used to ignite HMI (Hydrargyrum Medium Arc Iodide), Xenon and mercury arc lamps of the type typically used in motion pictures, video applications, theater and television. The ignitor in... | 09/18/1990 |
| 4956583 | Control system for electrical lighting A control system for lighting a bank of fluorescent lamps, includes input terminals (10, 11) for a mains voltage (e.g. 240 v) and output terminals (20, 21) to which the bank of lamps is connected. A transformer (T1) provides a reduced voltage (216 v) as c... | 09/11/1990 |
| 4839565 | High pressure double wall sodium arc tube and methods of operating such A high intensity discharge metal vapor lamp comprising an arc tube having an inner chamber vented to the arc tube and disposed therein is disclosed. The combination of the arc tube and inner chamber being of a double wall construction confines the arc con... | 06/13/1989 |
| 4754201 | Magnetic low load factor series ballast circuit A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core a... | 06/28/1988 |
| 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 |
| 4704561 | Push-pull generator A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors ... | 11/03/1987 |
| 4686427 | Fluorescent lamp dimming switch An electronic ballast system for operating fluorescent lamps at full and partial brightness is disclosed having a series reactance selectively switched into or out of the system by a reactance switch. The electronic ballast has an input filtering section,... | 08/11/1987 |
