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| Number | Title | Issue Date |
| 7541751 | Soft start control circuit for lighting A low voltage lighting system includes a transformer having at least a primary winding and a secondary winding. The low voltage lighting system also includes one or more lighting elements and a voltage control circuit. The lighting elements are coupled to the second... | 06/02/2009 |
| 7535185 | Method and system for implementing power reduction algorithms in a night vision system power system A night vision system comprising a power system having a low voltage unit coupled to a high voltage unit. The low voltage unit includes a low voltage controller and a low voltage table correlating step values to pulse widths, the low voltage controller obtaining a d... | 05/19/2009 |
| 7528557 | Electronic controller for high-power gas discharging lamp An electronic controller for a high-power gas discharging lamp bulb includes a filter circuit to reduce interference and control the electromagnetic characteristics of an input power signal. A rectifier circuit electrically communicates with the filter circuit to ge... | 05/05/2009 |
| 7525261 | Circuit arrangement for operating a high pressure discharge lamp A circuit arrangement for operating a high pressure discharge lamp comprises a down converter equipped with an output capacitor and a commutator equipped with lamp connection terminals. The amplitude of the DC current generated by the down converter is controlled by... | 04/28/2009 |
| 7521879 | Device for driving light emitting diode A device for driving a plurality of light emitting diodes includes a plurality of light emitting diode groups in series; a current providing unit for providing a current to the plurality of light emitting diode groups; and at least one current path controller in par... | 04/21/2009 |
| 7518321 | Luminance adjusting device The invention is directed to a light module, which allows the individual lamp unit to be replaced with a new one and the luminance of the newly-replaced lamp unit can be automatically or manually adjusted to get a uniform luminance. Wherein, information of a first r... | 04/14/2009 |
| 7514883 | Illuminating device for imaging apparatus An illuminating device for imaging apparatus includes: a light source; plural batteries that supply power to the light source; plural detection voltage generating units that are provided with respect to each battery and generate detection voltages from output voltag... | 04/07/2009 |
| 7511437 | Methods and apparatus for high power factor controlled power delivery using a single switching stage per load Methods and apparatus for high power factor power transfer to a load using a single switching stage. In exemplary implementations, a controllable variable power may be delivered to a load using a single switching stage while maintaining high power factor, in some ca... | 03/31/2009 |
| 7511436 | Current control method and circuit for light emitting diodes A flow of a LED current (ILED2) through one or more LEDs is controlled by a LED current control circuit (50-54) implementing a method (30) that is independent of an input line and a load of the LED(s). ... | 03/31/2009 |
| 7504783 | Circuit for driving and monitoring an LED Described herein is technology for, among other things, a circuit for controlling a current through an LED. The novel circuit includes a regulator for providing the current to the LED, an LED voltage monitoring circuit for monitoring a voltage drop across the LED an... | 03/17/2009 |
| 7504782 | Discharge lamp lighting apparatus and projector A discharge lamp lighting apparatus comprising a d.c. power source section which rectifies and smoothes an a.c. voltage; a current detecting circuit which detects a current which flows through a discharge lamp; a power source ripple detecting circuit which detects a... | 03/17/2009 |
| 7489090 | Electronic ballast having adaptive frequency shifting An electronic ballast for driving a gas discharge lamp avoids mercury pumping in the lamp by adaptively changing an operating frequency of an inverter of the ballast when operating near high-end. The inverter of the ballast generates a high-frequency AC voltage, whi... | 02/10/2009 |
| 7479743 | Vehicle lighting apparatus A vehicle lighting apparatus includes a plurality of semiconductor light sources that are connected with each other in series, a switching regulator for supplying an electric power from a power source to each of said plurality of semiconductor light sources, forward... | 01/20/2009 |
| 7479744 | Power dimmer A circuit for controlling the power in a load supplied by an A.C. voltage and directly connected to a first terminal of application of the A.C. voltage, including two isolated-gate bipolar transistors, connected in anti-parallel between a second terminal of applicat... | 01/20/2009 |
| 7477024 | Sequential burst mode activation circuit A sequential burst mode regulation system to deliver power to a plurality of loads. In the exemplary embodiments, the system of the present invention generates a plurality of phased pulse width modulated signals from a single pulse width modulated signal, where each... | 01/13/2009 |
| 7477025 | Power control circuit for adjusting light The present invention discloses a power control circuit for adjusting light, which adopts both frequency modulation and amplitude modulation for the control and starts using the amplitude modulation control after the frequency change exceeds a predetermined limit ra... | 01/13/2009 |
| 7474064 | Lamp driving circuit for a discharge lamp and a control method thereof A lamp driving circuit includes a step-up transformer, a detector, and a controller. The step-up transformer includes a primary winding, and a secondary winding configured to cooperate with a discharge lamp to form a tank circuit that generates a tank current. The d... | 01/06/2009 |
| 7468586 | 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 ... | 12/23/2008 |
| 7459867 | Program start ballast A ballast (10) for powering at least one gas discharge lamp (70) in a program start mode comprises an inverter (200), a resonant output circuit (400), and a control circuit (600). During operation of ballast (10), control ci... | 12/02/2008 |
| 7456589 | Light output modulation for data transmission A method of operating a light source (100) including a ballast (110) in electrical communication with a lamp (120). The method includes operating the ballast (110) to determine (920) an average lamp power to be applied to the lamp ... | 11/25/2008 |
| 7449845 | Backlight assembly and display apparatus having the same Backlight assembly and the display device using the same are disclosed. Backlight assembly comprises a container and a detector. The container holds a light and electromagnetic field generating source and a sampling portion for passing the light and/or electromagnet... | 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 |
| 7443701 | Double-ended converter A full bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first driver and a second driver are coupled to the push/pull con... | 10/28/2008 |
| 7443110 | Discharge lamp energizing circuit and method of energizing discharge lamp A discharge lamp energizing circuit has a pulse generating circuit and a control circuit. The pulse generating circuit has a DC power supply unit, and a transformer, a first semiconductor switch, and a second semiconductor switch which are connected in series across... | 10/28/2008 |
| 7443105 | Ballast circuit for gas discharge lamps A ballast circuit for a gas discharge lamp, having the capability to shift frequency after starting to reduce electromagnetic interference (EMI). Embodiments of the circuit contain an oscillator circuit that generates and supplies an oscillating signal and a time de... | 10/28/2008 |
| 7439688 | Discharge lamp lighting circuit with power control A discharge lamp lighting circuit includes an emission acceleration controller for detecting a voltage for a discharge lamp and for supplying power exceeding a rated value when the discharge lamp is initially lighted, and thereafter gradually reducing the power to s... | 10/21/2008 |
| 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 |
| 7436128 | Driving circuit for hot cathode fluorescent lamps A driving circuit for hot cathode fluorescent lamps aims to filter out signals with a voltage value lower than a duty voltage value of a switch unit through a commutation unit and a valley filled power correction circuit to prevent power from accumulating and the sw... | 10/14/2008 |
| 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 |
| 7436126 | Resonant ballast circuit A low cost ballast circuit for fluorescent lamp is provided. A fluorescent lamp is connected in series with a resonant circuit having a transformer. A first switch and a second switch are coupled to switch the resonant circuit. A first winding of the transformer is ... | 10/14/2008 |
| 7436130 | Cold-cathode tube lighting device for use in a plurality of cold-cathode tubes lit by two low-impedance power sources A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a dire... | 10/14/2008 |
| 7436125 | Light emitting diode drive circuit Provided is an LED drive circuit capable of controlling a current caused to flow through an LED at a proper value even when a power supply voltage is higher than a sum of a forward voltage of the LED to be driven and a voltage of a current sense element. In a config... | 10/14/2008 |
| 7436131 | Thermal protection for lamp ballasts The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while ... | 10/14/2008 |
| 7434941 | System and method for arc lamp power control An arc lamp system includes an arc lamp, having a life span, a power supply, and a power control servo. The power supply is electrically coupled to the arc lamp and configured to provide power thereto, and the power control servo is coupled to the power supply, and ... | 10/14/2008 |
| 7432670 | Device for turning on high-pressure discharge lamp and lighting apparatus equipped with the device Even if a DC output voltage of a step-down chopper circuit (3) is lowered from a value in a non-lighted state or a no-load state due to a discharge occurring between conductors (105a) in a cable (104), the turn on detection circuit (26... | 10/07/2008 |
| 7432667 | Projector lamp control for increased lamp life An electronic lamp control system for life time extension of a DC high intensity discharge lamp has a light sensor (130) for sensing an output of a lamp (31), a power supply (110) for the lamp (31), and a controller (20) for contro... | 10/07/2008 |
| 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 |
| 7429834 | Multi-lamp driver with active current regulator An active current regulator circuit. In one embodiment, the active current regulator circuit includes a first input node for receiving a first reference electrical signal, a second input node for receiving a second reference electrical signal, a ground node, and an ... | 09/30/2008 |
| 7429830 | Power control of a fluorescent lamp A fluorescent lamp (2), in particular a backlight lamp of a display device, is supplied with an alternating voltage, a frequency and an amplitude of which being greater during ignition than during normal operation of the lamp. The voltage (V) across the lamp ... | 09/30/2008 |
| 7429833 | Power-saving and stabilizing ballast A power-saving and stabilizing ballast includes a bridge rectifier circuit, an electrolytic capacitive filter circuit, a half bridge inverter circuit, and an LC output circuit, all of which are sequentially and electrically connected. An EMC filter circuit is electr... | 09/30/2008 |
