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| Number | Title | Issue Date |
| 8138683 | Method for controlling a series circuit current of a lighting installation at an airfield or the like, and a constant-current regulator Disclosed is a method for controlling a series circuit current of a lighting installation at an airfield or the like, in which case the series circuit current which flows through transformers which are arranged on the secondary side of an output transformer and are ... | 03/20/2012 |
| 8115405 | High pressure discharge lamp lighting device and luminaire using same A high pressure discharge lamp lighting device includes a DC power source circuit; a power supply circuit for converting an output from the DC power source circuit into a square wave AC output to be supplied to a high pressure discharge lamp; a starting circuit for ... | 02/14/2012 |
| 8093824 | Backlight driving system A backlight driving system comprises an inverter module, a current balance module, a feedback module and an open-lamp protection detection module. The inverter module provides electrical signals to a plurality of lamps. The current balance module balances currents f... | 01/10/2012 |
| 8076864 | Circuit configuration for starting and operating at least one discharge lamp A circuit arrangement for starting and operating at least one discharge lamp is provided. ... | 12/13/2011 |
| 8044604 | Inverter A soft start circuit generates a soft start voltage which changes over time when light emission of an EEFL is started. A pulse modulator receives a feedback voltage that corresponds to the output voltage of an inverter and the soft start voltage, and adjusts the dut... | 10/25/2011 |
| 8013536 | Inverter circuit From the individual small areas of a conductor pattern arranged on the back side of a circuit board, there are individually extended leader patterns, which are midway led by through holes to the surface side of the circuit board. The individual leader patterns led t... | 09/06/2011 |
| 7973489 | Lighting system for illumination using cold cathode fluorescent lamps A lighting system for illuminating a chamber in a building includes a lighting fixture suitable for being mounted onto a surface of the chamber, so that light emitted by at least one CCFL device mechanically supported by the fixture illuminates the chamber. The one ... | 07/05/2011 |
| 7973490 | HID lighting control with transient voltage sensing and lamp restarting, and method of making and using A voltage control apparatus (10) for an HID lamp includes a voltage control transformer circuit (20), and is connected between supply mains (22) and a high intensity discharge (HID) lamp. The HID lamp is started at full line voltage, and after a... | 07/05/2011 |
| 7928664 | Illumination systems An illumination system includes a master power supply providing power to several illumination modules. The master power supply is constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current loop. ... | 04/19/2011 |
| 7821209 | Light source unit, illumination apparatus for display apparatus, and display apparatus A light source unit for use in, for example, a backlight for illuminating a display panel of a liquid crystal display apparatus, includes a cold-cathode tube having discharge electrodes provided one in each end portion of a glass tube whose interior is filled with a... | 10/26/2010 |
| 7768213 | High-efficiency single-ended forward-flyback electronic driver for barrier discharge lamps An electronic circuit topology (1) for driving a predominantly capacitive load (2) with a primary circuit with several components, a secondary circuit with a predominantly capacitive load (2), and a transformer device (4) with a primary s... | 08/03/2010 |
| 7746003 | Transformer wiring method and apparatus for fluorescent lighting A transformer wiring method and apparatus for fluorescent lighting are described. The fluorescent lighting apparatus includes a transformer and a ballast. An installer is easily able to balance the system load because each fluorescent lighting apparatus includes its... | 06/29/2010 |
| 7696702 | Transformer, backlight apparatus, and display apparatus A transformer includes: a primary winding receiving portion having a primary winding wound around an axis; and a pair of secondary winding receiving portions each having a secondary winding wound around an axis and disposed on the opposite sides of the first primary... | 04/13/2010 |
| 7675242 | Electronic ballast An electronic ballast for the operation of a lamp arrangement includes at least one lamp, in particular, a low-pressure discharge lamp and at least one transformer for balancing the lamp currents, whereby the transformer has two windings, provided for one or more la... | 03/09/2010 |
| 7663322 | Backlight driving system for liquid crystal display There is provided a backlight driving system for a liquid crystal display that can reduce size and weight of a product because a DC-DC converter is not used when commercial AC power is converted into lamp driving power. A backlight driving system for a liquid crysta... | 02/16/2010 |
| 7652435 | Lamp driving circuit and display apparatus having the same A lamp driving circuit includes: a first voltage generator which receives a direct current power voltage and outputs a first square wave voltage in response to a first switching signal and a second switching signal having a phase inverted with respect to the first s... | 01/26/2010 |
| 7615936 | Inductively powered apparatus An inductive power supply system for providing power to one or more inductively powered devices. The system includes a mechanism for varying the physical distance or the respective orientation between the primary coil and secondary coil to control the amount of powe... | 11/10/2009 |
| 7586269 | Device for driving light source module A driving device for driving a lamp (L2) includes a power stage circuit (21), a transformer circuit (22), a resonance circuit (23) and a PWM controller (25). The power stage circuit converts a received direct current (DC) signal to... | 09/08/2009 |
| 7567040 | High efficiency driver for color light emitting diodes (LED) An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a di... | 07/28/2009 |
| 7564193 | DC-AC converter having phase-modulated, double-ended, full-bridge topology for powering high voltage load such as cold cathode fluorescent lamp A phase-modulated, double-ended, full-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... | 07/21/2009 |
| 7550928 | Driving circuit for multiple cold cathode fluorescent lamps backlight applications The present invention provides a driving circuit for driving a light source. The driving circuit includes a serial-arranged transformers system having multiple primary windings and secondary windings; a first switch conducting current though a first path and a secon... | 06/23/2009 |
| 7518317 | Backlight driving and control circuit with an isolated power factor correction structure A backlight driving and control circuit with an isolated power factor correction structure includes a power stage for providing a power supply; a driver stage having a first power factor correction unit for correcting the power factor of the power supply and outputt... | 04/14/2009 |
| 7492106 | Inverter circuit, backlight assembly, liquid crystal display having the same, and method thereof A backlight assembly prevents abnormal discharge of a device using a high voltage to drive a discharge tube such as CCFL. An inverter circuit includes an inverter transformer supplying an AC high voltage to a plurality of discharge tubes, and a plurality of balance ... | 02/17/2009 |
| 7449842 | Discharge tube drive circuit A discharge tube drive circuit for driving a plurality of discharge tubes is proposed with reduced number of parts and in a down-sized form. A first balance transformer is provided in a first drive circuit block, and a plurality of primary coils of a plurality of dr... | 11/11/2008 |
| 7443112 | Current balancing circuit for a multi-lamp system The present invention uses one or more transformers disposed between an inverter driver to drive a plurality of lamps. Each transformer has a first coil and a second coil magnetically coupled to each other. Each of the first and second coils has an input end and an ... | 10/28/2008 |
| 7443108 | Apparatus for driving a plurality of lamps A power system for driving a plurality of lamps includes a transformer circuit, a current balancing circuit, and a light source. The transformer circuit includes a plurality of transformers in a quantity denoted by N, and each of the transformers has a first, a seco... | 10/28/2008 |
| 7439684 | Inductive lamp assembly An inductive power supply system for providing power to one or more inductively powered devices. The system includes a mechanism for varying the physical distance or the respective orientation between the primary coil and secondary coil to control the amount of powe... | 10/21/2008 |
| 7432669 | Backlight unit and method for driving the same A backlight unit includes a plurality of fluorescent lamps driven by one inverter in a manner to prevent wave noise. A first common electrode line connects respective first ends of the odd numbered fluorescent lamps in common. A second common electrode line connects... | 10/07/2008 |
| 7429831 | Balance controlling circuit An exemplary balance controlling circuit (100) includes a transformer (T11), a first capacitor (C11), a second capacitor (C22), a first inductor (TC11), and a second inductor (TC12). The transformer includes two inputs (4... | 09/30/2008 |
| 7425800 | Device for driving a light source module A driving device for driving a light source module (32) includes a switch circuit (30), a transformer circuit (31), a voltage sensing circuit (34), a current sensing circuit (35), and a PWM controller (33). The switch circui... | 09/16/2008 |
| 7411356 | Power supply for multiple discharge lamps and the current balance device thereof A power supply for discharge lamp includes a transformer and a current balance device, wherein the transformer includes a primary winding and a secondary winding and the current balance device is coupled between the secondary winding and a plurality of discharge lam... | 08/12/2008 |
| 7411354 | Feedback and protection circuit of liquid crystal display panel backlight apparatus A feedback and protection circuit is provided for detecting voltage and current of a cold cathode fluorescent lamp (CCFL) of a liquid crystal display (LCD) panel backlight apparatus and integrating all voltage and current input signals to output single current and v... | 08/12/2008 |
| 7408308 | LED drive circuit, LED lighting device, and backlight To realize an LED drive circuit capable of feeding equal currents to parallel-connected LED circuits with a simple arrangement, there are provided a current source generating a temporally altering current and a first smoothing capacitor and a second smoothing capaci... | 08/05/2008 |
| 7402957 | Inverter circuit, backlight assembly, and liquid crystal display with backlight assembly In an inverter circuit, inverter transformers supply AC voltage to discharge tubes. The inverter transformers are arranged such that the AC voltage at a respective first terminal of each secondary coil has an opposite polarity with respect to a corresponding second ... | 07/22/2008 |
| 7397199 | Discharge lamp lighting device Output of a chopper circuit is converted to a rectangular wave by a push-pull circuit, and is provided to a step-up transformer. When a switch is turned on, the control voltage of the chopper circuit is relatively low, and a high output voltage is provided to the tr... | 07/08/2008 |
| 7391166 | Parallel lighting system for surface light source discharge lamps Disclosed is a low-cost parallel lighting system for discharge lamps for a surface light source, which reduces nonuniform brightness and static noise, and fulfills a requirement that lamp currents of individual cold-cathode fluorescent lamps should be uniform and st... | 06/24/2008 |
| 7391170 | Device for driving light source module A voltage sensing circuit (230) for sensing voltage signals of input alternating current (AC) signals includes a plurality of voltage dividing circuits (23n (n=1, 2, 3, . . . , n)) and a charging circuit (232). The voltage dividing circui... | 06/24/2008 |
| 7385357 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 06/10/2008 |
| 7382099 | Striation control for current fed electronic ballast In a lamp lighting ballast which generates a lamp lighting signal for a lamp, provided is a striation elimination circuit to increase the lumen output frequency for elimination of visual striations which may occur within the lamp. An even harmonic signal generator i... | 06/03/2008 |
| 7378803 | Igniting pulse booster circuit A pulse booster circuit (10) comprises a first pulse transfer path (41) and a second pulse transfer path (42) extending between input terminals (11a; 11b) and output terminals (12a; 12b). A... | 05/27/2008 |
