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| Number | Title | Issue Date |
| 7683555 | Discharge tube lighting circuit and electronic apparatus provided with the discharge tube lighting circuit In a backlight, for example, a pair of U-shaped discharge tubes are connected to connectors of a discharge tube lighting circuit. A secondary output voltage of a first transformer is applied to a first end of one U-shaped discharge tube via a power supply electrode.... | 03/23/2010 |
| 7541747 | Multiple discharge lamp lighting apparatus There is provided a multiple discharge lamp lighting apparatus, which includes an inverter and plurality of inverter transformer. In the multiple discharge lighting apparatus, a discharge lamp is connected to the secondary winding of each inverter transformer, a bal... | 06/02/2009 |
| 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 |
| 7372213 | Lamp current balancing topologies A method according to on embodiment may include generating AC voltage and current and a striking voltage. The method of this embodiment may also include generating striking voltage and steady-state voltage for at least two lamp loads. The method of this embodiment m... | 05/13/2008 |
| 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 |
| 7336039 | Driving device for discharge lamps A driving device for driving discharge lamps (14) includes a first pulse circuit (11), a second pulse circuit (13), and a primary driving circuit (12). The first pulse circuit includes an input end, a first output end (1), and a se... | 02/26/2008 |
| 7285925 | Backlight module control circuit of multi-lamp display device A backlight module control circuit of a multi-lamp display device includes a control unit, multiple lamp driving circuits and a fault detection unit. The control unit includes multiple signal output terminals. Input terminals of the lamp driving circuits are respect... | 10/23/2007 |
| 7253564 | Lamp current balancing device A lamp current balancing device comprises an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC; the transformer having a primary side connected to the electronic power switch and both ends of a secondary side connect... | 08/07/2007 |
| 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 |
| 7227316 | Protective and measure device for multiple cold cathode fluorescent lamps A protective and measure device for multiple cold cathode fluorescent lamps includes an electronic ballast functioning as a high-frequency power source for driving multiple cold cathode fluorescent lamps (CCFLs), primarily by parallel connecting one end of each of a... | 06/05/2007 |
| 7199529 | Inductive lighting system with back-up battery A pathway lighting system has self-contained, battery up scaled lighting modules (20), each module including at least one secondary coil. A plurality of primary coils are housed within a carrier assembly (1) together with voltage circuitry (14).... | 04/03/2007 |
| 7173382 | Nested balancing topology for balancing current among multiple 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... | 02/06/2007 |
| 7164240 | Method and apparatus for driving an external electrode fluorescent lamp A technique for driving one or more EEFLs, having first and second ends, in a bank of EEFLs involves driving the EEFLs at both the first and second ends. In a non-limiting embodiment a device constructed according to the technique includes a bank of EEFLs connected ... | 01/16/2007 |
| 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 |
| 7119496 | Inverter for liquid crystal display, and power supply arrangement comprising such an inverter A power supply arrangement is provided for supplying power to a plurality of back and/or edge illumination devices (5) in a liquid crystal display unit (1), comprising a mains connection (7), a power converter (6) and at least one inverte... | 10/10/2006 |
| 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 |
| 6954364 | Backlight inverter for liquid crystal display panel with self-protection function A backlight inverter for an LCD panel which is capable of detecting a fault in a transformer device or an open-lamp condition and performing a control operation to stop its operation upon detecting the fault in the transformer device or the open-lamp condition. The ... | 10/11/2005 |
| 6828738 | Energy-saving light marking device with low power consumption An energy-saving light marking device with low power consumption including a head transformer (10) where the primary winding (12) is powered by an alternating current source and several marking lamps in series (14-1 to 14-3)... | 12/07/2004 |
| 6817729 | Beacon system with enhanced insulation and sealing A airport runway lighting system, including a power source (10) supplying a constant current to a primary circuit (12) and several marking lights (14-1 to 14-6) each being connected to the primary circuit by a current transf... | 11/16/2004 |
| 6445133 | Incandescent lamp with integral voltage converter An incandescent lamp is designed to operate at lower than the AC line voltage and includes a voltage conversion circuit for lowering the line voltage to the operating voltage of the lamp. The circuit includes an output transformer which is disposed in the... | 09/03/2002 |
| 5900700 | Process and circuit arrangement for operating cold cathode discharge lamps A first intermediate direct voltage is generated from a current source or board voltage, and a second sinusoidal intermediate alternating voltage is generated with a current inverter. This intermediate alternating voltage is transformed by one or more tra... | 05/04/1999 |
| 5486739 | Ballasting system for fluorescent lamps having improved energy transfer Ballasting system for fluorescent lamps having improved energy transfer capability and which delivers a sinusoidal current waveform free of high order harmonics and induces a similar waveform into the power distribution system. The system includes a low l... | 01/23/1996 |
| 5345150 | Regulating light intensity by means of magnetic core with multiple windings A device for regulating the intensity of light emitted by a lamp includes a core of magnetic material, a first electrical circuit having a primary inductor wrapped around at least a portion of the core of magnetic material, and a second electrical circuit... | 09/06/1994 |
| 4912372 | Power circuit for series connected loads A power circuit for N series connected loads according to the present invention includes N transformers having primary windings connected in series across a constant current AC source and secondary windings connected in series with the N loads. N-1 conduc... | 03/27/1990 |
| 4896078 | Distributed ballasting system for sun tanning apparatus A ballasting system for powering an array of multiple parallel-oriented fluorescent lamps in a sun tanning apparatus comprises and an electronic frequency converter adapted to convert ordinary 60 Hz power line voltage into a 350 Volt/30 Hz sinusoidal volt... | 01/23/1990 |
| 4723096 | Arc lamp power supply using a voltage multiplier A power supply is provided for an arc discharge lamp (38) which includes a relatively low voltage high current power supply section and a high voltage starter circuit (10). The low voltage section includes a transformer (15), rectifier (24), variable resi... | 02/02/1988 |
| 4568860 | Rapid start fluorescent lamp circuits with disconnect sockets A two-lamp rapid start fluorescent lamp circuit in which the lamps are ignited in sequence and then operated in series. The circuit being energized from a low voltage a.c. source through the use of a substantially conventional ballast which utilizes a tra... | 02/04/1986 |
| 4366417 | Suppression circuit for interference pulses in transformers with high leakage inductance A circuit for suppressing interference pulses occurring in transformers with high leakage inductance. The circuit includes current controlled switches connected to the transformers having secondary windings. The switches are controlled by a trigger circui... | 12/28/1982 |
| 4259616 | Multiple gaseous lamp electronic ballast circuit An electronic ballast circuit for a multiple gaseous lamp load includes a feedback rectifier circuit coupled to a high frequency inverter circuit and to a DC source. The high frequency inverter circuit is also coupled to the multiple gaseous load and a va... | 03/31/1981 |
| 4213076 | Constant-current transformer for gas-discharge tubes A constant current transformer for gas-discharge tubes consisting of an aluminum can containing an iron core made of grain-oriented magnetic sheet material in split-tape core form with electrically isolated primary and secondary windings. The core has gap... | 07/15/1980 |
| 4127795 | Lamp ballast circuit A highly efficient tuned oscillator ballast circuit especially suitable for a fluorescent lamp load includes an oscillator circuit coupled to a pulsed DC potential source and having a tuned output circuit coupled to a load circuit, to a drive circuit for ... | 11/28/1978 |
| 3991344 | Solid-state dimmer for dual high pressure discharge lamps A lighting control apparatus to provide variable intensity light from high pressure discharge lamps using two high pressure discharge lamp loads connected in series to provide more widely variable intensity of light. The outputs of two ballasts may be con... | 11/09/1976 |
