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| Number | Title | Issue Date |
| 8164280 | Electronic ballast Provided is an electronic ballast including: a rectifier which rectifies alternating current (AC) power into direct current (DC) power; a power factor compensator which improves a power face of the DC power; an inverter which inverts the DC current into high frequen... | 04/24/2012 |
| 7372214 | Apparatus and method for driving lamp of liquid crystal display device A lamp driving apparatus of a liquid crystal display includes a plurality of lamps arranged with a predetermined distance between adjacent lamps; a comparator to compare output voltages of lamps that are separated by more than the lamp distance; and a power intercep... | 05/13/2008 |
| 7366283 | Method to control anodic current in an x-ray source An apparatus and method for an x-ray system includes an x-ray emitter having a first electrode and a second electrode. A high voltage supply is electrically connected to the first electrode. A power supply is electrically connected to the second electrode. A control... | 04/29/2008 |
| 7365502 | Device for driving light sources A device for driving a light source (L11) including a first lamp (a1) and a second lamp (a2) includes two power supply circuits, two transformers (12, 12′), and two current balancing components (13, 13′). Each power... | 04/29/2008 |
| 7358684 | Balanced circuit for multi-LED driver A driving circuit uses a plurality of transformers to provide currents for driving a plurality of LEDs associated with a plurality of current paths. Each transformer has two induction coils with a coil turn ratio between to the number of turns in each induction coil... | 04/15/2008 |
| 7271549 | 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 ... | 09/18/2007 |
| 7268501 | Multi-lamp driving circuit A multi-lamp driving circuit includes a transformer, a first lamp, a second lamp, a current/voltage converting circuit and a voltage/current converting circuit. Transformer includes a secondary coil having a first output terminal and a second output terminal. Each o... | 09/11/2007 |
| 7265681 | Light emitted diode driving apparatus A driving apparatus includes a DC-to-DC converter, a first LED series, a second LED series, a first constant-current circuit, a second constant-current circuit, and a feedback circuit. The DC-to-DC converter respectively outputs a direct-current voltage to one termi... | 09/04/2007 |
| 7245091 | Inverter capable of switching working frequency An inverter capable of switching working frequency for activating a lamp. The inverter comprises a voltage converter, a feedback circuit, a control unit and a frequency switcher. The voltage converter transforms a DC input voltage into a second AC voltage according ... | 07/17/2007 |
| 7224125 | Dimmable fluorescent lamp package A lamp package includes a base for insertion into an electrical socket, a complete dimmable ballast circuit contained within and electrically connected to the base, and a fluorescent lamp, including a CFLP, connected to and dimmed through the ballast circuit. The ba... | 05/29/2007 |
| 7196483 | Balanced circuit for multi-LED driver A driving circuit uses a plurality of transformers to provide currents for driving a plurality of LEDs associated with a plurality of current paths. Each transformer has two induction coils with a coil turn ratio between to the number of turns in each induction coil... | 03/27/2007 |
| 7190123 | Circuit structure for driving a plurality of cold cathode fluorescent lamps A DC/AC converter circuit structure for driving a plurality of cold cathode fluorescent lamps is described. A common-mode choke is used between the cold cathode fluorescent lamps. The common-mode choke balances the currents respectively flowing through the cold cath... | 03/13/2007 |
| 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 |
| 7148628 | Photosensitive control with dynamic calibration A method and circuit arrangement dynamically calibrate a photosensitive control for a light source that includes a voltage divider circuit coupled to a resistive light detector and configured to output to a comparison circuit a variable voltage signal that varies wi... | 12/12/2006 |
| 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 |
| 7141941 | Staggering switching signals for multiple cold cathode fluorescent lamp backlighting system to reduce electromagnetic interference In order to minimize switching-induced electromagnetic interference in a power supply switching circuit of the type used to control the AC power for multiple high voltage devices, such as cold cathode fluorescent lamps employed for backlighting a large scale liquid ... | 11/28/2006 |
| 7122975 | Filament lamp light quantity control method and filament lamp light quantity control unit and filament lamp light source unit The invention relates to a light source unit control method and a light source control unit, and a light source unit comprising a filament lamp with a characteristic of having a light quantity changing almost in proportion to a control voltage, which comprise: a cur... | 10/17/2006 |
| 7106009 | Duplexing protection apparatus and operation method thereof A lamp duplexing protection apparatus comprises a first lamp module and a second lamp module. The first lamp module outputs a first decision signal according to whether the first lamp operates normally. The second lamp module outputs a second decision signal accordi... | 09/12/2006 |
| 7098612 | Frequency synchronization device for LCD lamps A frequency synchronization device for a large LCD having a plurality of lamps as a background light source is disclosed. The device comprises a power amplification unit wherein one power amplification unit is electrically coupled to another amplification unit, each... | 08/29/2006 |
| 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 |
| 7015651 | Light source device having a discharge lamp with high radiance and a current feed controller To eliminate the disadvantage that the lamp current becomes large in a light source device with a discharge lamp with high radiance in a lamp with a low saturation lamp voltage, in a light source device having a discharge lamp with a pair of opposed electrodes conne... | 03/21/2006 |
| 7015659 | Apparatus for driving a light tube and method therefor An apparatus for driving a light tube and the method thereof. The driving apparatus includes a delay unit, a first logic device, a second logic device, and a transformer. The delay unit receives an input signal and a voltage control signal, and outputs a delay signa... | 03/21/2006 |
| 6998797 | Device and method for adjusting currents of lamp tubes A device for adjusting currents of lamp tubes in a display. The device includes a feedback device, a first switch, a second switch, a main control device, a resonance circuit, a transformer, and a low-frequency switch controller. The low-frequency switch controller ... | 02/14/2006 |
| 6963179 | Frequency synchronization device for LCD lamps A frequency synchronization device for a large LCD having a plurality of lamps as a background light source is disclosed. The device comprises a power amplification unit arranged in loop, each power amplification unit being electrically coupled to one of the lamps, ... | 11/08/2005 |
| 6946806 | Method and apparatus for controlling minimum brightness of a fluorescent lamp An efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and... | 09/20/2005 |
| 6922023 | Multiple-lamp backlight inverter An inverter for driving multiple discharge lamps. The inverter has a transformer for driving a first discharge lamp and a second discharge lamp. The inverter also includes a first balancing circuit connected in series with the first discharge lamp and a second balan... | 07/26/2005 |
| 6906476 | Power control system for reducing power to lighting systems A power control system is disclosed for controlling the power supplied to a lighting system and limiting power during time of peak demands and the like wherein the lighting system includes a power source and a lighting load connected to the power source. The control... | 06/14/2005 |
| 6873122 | Apparatus for operating discharge lamps An apparatus for operating a plurality of discharge lamps is to be designed so as to be more cost-effective. A first current control device, in particular a heat-sensitive resistor having a positive temperature coefficient, is connected in parallel with a first cont... | 03/29/2005 |
| 6784623 | Variable switch with reduced noise interface A direct-current dimmer switch with low noise. A direct-current switch is turned on relatively slowly to avoid noise generation. Input capacitance of the direct-current switch device works in conjunction with a switch input series resistor to avoid a sharp turn-on c... | 08/31/2004 |
| 6703796 | Power supply and inverter used therefor This invention relates to a power supply that integrates a rectifier/filter's circuitry and a converter's circuitry with an inverter to reduce space occupied and increase power efficiency. The power supply includes: a rectifier/filter, a DC-DC converter a... | 03/09/2004 |
| 6501236 | Variable switch with reduced noise interference A direct-current dimmer switch with low noise. A direct-current switch is turned on relatively slowly to avoid noise generation. Input capacitance of the direct-current switch device works in conjunction with a switch input series resistor to avoid a shar... | 12/31/2002 |
| 6420839 | Power supply system for multiple loads and driving system for multiple lamps The present invention relates to a driving system for multiple lamps, which comprises a plurality of lamps including one master lamp and at least one slave lamp, an inverter circuit for converting DC power to AC power to be supplied to said plurality of l... | 07/16/2002 |
| 6400102 | Non-linear light-emitting load current control A sensor circuit detects a current supplied to a set of light-emitting diodes and produces a current reading dependent on the temperature of .operation of these light-emitting diodes. The sensor circuit comprises first and second serially interconnected r... | 06/04/2002 |
| 6310446 | Method for adjusting at least one operating parameter of an operating unit for electric lamps The invention relates to a method for adjusting at least one operating parameter of an operating unit (EVG), equipped with a microcontroller (MC), for electric lamps. The adjusting method according to the invention includes a closed loop which carries out... | 10/30/2001 |
| 6285139 | Non-linear light-emitting load current control A sensor circuit detects a current supplied to a set of light-emitting diodes and produces a current reading dependent on the temperature of operation of these light-emitting diodes. The sensor circuit comprises first and second serially interconnected re... | 09/04/2001 |
| 6211625 | Electronic ballast with over-voltage protection In an electronic ballast, a rapid start fluorescent lamp is powered by being parallel-connected with the tank-capacitor of a series-resonant LC circuit. Beating power for the lamp's cathodes is obtained by way of loosely-coupled auxiliary windings on the ... | 04/03/2001 |
| 5896010 | System for controlling lighting in an illuminating indicating device A system for providing one-step dimming of indicator lights in an illuminating indicating device while allowing adjustable control of the general illumination of the device. The system includes a first current drain (176) coupled to an indicator light sou... | 04/20/1999 |
| 5726537 | Circuit for pulsed operation of a discharge lamp To provide for automatic switch-over between a power phase and a holding se in operation of a discharge lamp (EL), a choke or ballast coil (L), serially connected to the discharge lamp, is constructed to have, with respect to current flow therethrough, a... | 03/10/1998 |
| 5714847 | Power regulator A power regulator system provides power to an electrical load. A power level selector generates a reference signal which indicates a desired power level for the electrical load, and a control circuit connected with a AC power source interrupts flow of the... | 02/03/1998 |
| 5686799 | Ballast circuit for compact fluorescent lamp A compact dimmable fluorescent lamp apparatus that connects with at least one fluorescent lamp and with an input power source that supplies an AC input voltage. The lamp includes a rectification stage for rectifying the AC input voltage, a dimming stage f... | 11/11/1997 |
