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| Number | Title | Issue Date |
| 8115396 | Light emitting diode lamp protecting circuit An LED lamp protecting circuit includes an LED lamp, a constant current source and a buffer circuit. The constant current source includes positive and negative input terminals, positive and negative output terminals and a switch. The buffer circuit is connected betw... | 02/14/2012 |
| 7429829 | Discharge lamp lighting circuit with an open protection circuit A discharge lamp lighting circuit includes a plurality of discharge lamps, a driving circuit, a control circuit, an open protection circuit, which are connected in series. The open protection circuit includes an open control circuit, a delay circuit, and a plurality... | 09/30/2008 |
| 7375476 | Lighting device having a circuit including a plurality of light emitting diodes, and methods of controlling and calibrating lighting devices A lighting device (132) includes a circuit having a power supply and a plurality of light emitting diodes (120) connected in series with the power supply. The plurality of light emitting diodes (120) includes at least two groups of series-connec... | 05/20/2008 |
| 7339323 | Serial powering of an LED string A circuit is used for driving a plurality of LEDs by an external voltage source. The LEDs are coupled in series. The circuit comprises a plurality of switches coupled to the LEDs in parallel, respectively, for individually controlling the brightness of the LEDs. The... | 03/04/2008 |
| 7330003 | Backlight control circuit with two transistors An exemplary backlight control circuit (200) includes two load circuits (210), a pulse width modulation integrated circuit (PWM IC) (250) having a current sampling pin (251), a switching circuit (270), a first input circuit (230... | 02/12/2008 |
| 7327095 | Discharge lamp lighting apparatus A discharge lamp lighting apparatus includes a DC-DC converter for outputting voltages having respective different potentials from two wirings, a switching circuit having input terminals connected to the two wirings, an output terminal connected to one electrode of ... | 02/05/2008 |
| 7285919 | Electronic ballast having improved power factor and total harmonic distortion An electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive switches having complementary duty cycles, a control circuit for controlling the controll... | 10/23/2007 |
| 7239087 | Method and apparatus to drive LED arrays using time sharing technique An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and ... | 07/03/2007 |
| 7208882 | Lighting device for discharge lamp A lighting device for high-pressure discharge lamp for lighting the high-pressure discharge lamp by lowering or raising a DC voltage applied to an input side by a DC/DC converter circuit, then converting the DC power into an AC power by a DC/AC inverter circuit, sup... | 04/24/2007 |
| 7084580 | Discharge lamp lighting circuit A discharge lamp lighting circuit 1 has: a DC-AC converter circuit 3 which receives a DC input, and which conducts AC conversion and a boosting operation; and a starting circuit 4 which supplies a starting signal to a discharge lamp 10. T... | 08/01/2006 |
| 7084581 | Device and method for controlling a gas discharge lamp, and lighting system with gas discharge lamp and control device A device and a method for the control of a gas discharge lamp are disclosed. In order to detract as little as possible from lamp life in spite of the luminous flux requirements to be fulfilled during the run-up of the lamp, the lamp is operated with an alternating c... | 08/01/2006 |
| 7075246 | Discharge lamp illumination circuit A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 for supplying a start-up signal to a discharge lamp. Power output from the DC-A... | 07/11/2006 |
| 7042166 | Circuit arrangement for operating electric lamps The invention relates to a circuit arrangement for operating electric lamps (5), in particular dielectric barrier discharge lamps, having an input stage (1) in the form of a voltage-increasing converter, in particular a step-up converter, and at least ... | 05/09/2006 |
| 7015657 | Ballast for high intensity discharging lamp A ballast includes a power unit for supplying DC, a converting unit having four switches connected to the power unit for converting DC into AC, a voltage-resistant electrocontrol switch connected to the converting unit and having at least one high-voltage diode and ... | 03/21/2006 |
| 6950079 | Light emitting diode driving circuit A luminance control circuit has luminance change characteristics similar to those of a conventional lamp when a light emitting diode is used as a light source. The luminance control circuit adjusts the value of a forward current flowing in the light emitting diode i... | 09/27/2005 |
| 6949885 | Discharge lamp lighting device and lighting apparatus A discharge lamp lighting device includes a discharge lamp that is lighted through an L-C resonance induced by an oscillation output of an inverter circuit. An on-off operation of switching elements of the inverter circuit is controlled by a control IC which include... | 09/27/2005 |
| 6856096 | Ballast with load-adaptable fault detection circuit A ballast (10) for powering a gas discharge lamp load (30) comprises an inverter (100), an output circuit (200), and a fault detection circuit (300). During operation, fault detection circuit (300) monitors a first signal an... | 02/15/2005 |
| 6717565 | Illuminating apparatus for a liquid crystal monitor and a digital camera having a liquid crystal monitor utilizing an illuminating apparatus thereof A liquid crystal monitor (LC monitor) illuminating apparatus utilizes a fluorescent lamp. The lamp is provided in a backlight portion to illuminate a liquid crystal monitor from behind. The fluorescent lamp is activated by a direct-current (DC) lighting circuit that... | 04/06/2004 |
| 6570342 | Fluorescent lamp and power converter A fluorescent lamp includes: an emission tube for generating a luminous flux; a first filament provided at one end of the emission tube; a second filament provided at another end of the emission tube; first current regulator having a first impedance; a fi... | 05/27/2003 |
| 6326733 | Electronic circuit to initiate and sustain current conduction in gaseous discharge lamps and method An electronic circuit is shown to initiate and sustain conduction in a gaseous discharge light. A breakover device and snubber network, isolation network, and self-adjusting symmetrical high voltage pulse generator are incorporated into a standard gaseous... | 12/04/2001 |
| 6184635 | Circuit arrangement for starting and for operating high-pressure lamps A circuit arrangement for starting and for operating high-pressure lamps makes an increased transfer voltage available to the discharge lamp. The increased transfer voltage is generated by voltage doubling across a rectifier unit by means of a charging ca... | 02/06/2001 |
| 6127789 | Apparatus for controlling the lighting of a discharge lamp by controlling the input power of the lamp Provided is an apparatus for controlling the power supplied to a discharge lamp by detecting the voltage and current of the lamp's electric supply line. A microcomputer monitors power consumption of the discharge lamp by multiplying the voltage and curren... | 10/03/2000 |
| 5962981 | Discharge lamp lighting device A discharge lamp lighting device which comprises a DC power source for generating a voltage necessary for a discharge lamp from a DC power source, a control circuit for calculating a power required by the discharge lamp to perform feedback control over th... | 10/05/1999 |
| 5504396 | Discharge lamp control system A new method of control of high voltage gaseous conductor lamps is herein provided allowing the selective control of the operation of such lamps in a single, or multiple lamp series-connected, current regulated supply circuit, through selective shorting o... | 04/02/1996 |
| 5481163 | Discharge lamp current controlling circuit A discharge-lamp lighting device stably lights and controls a discharge lamp suitable for use in a vehicle. In the discharge-lamp lighting device, an inverter for receiving DC power from a DC step-up circuit supplies AC power to the discharge lamp. Furthe... | 01/02/1996 |
| 5434474 | Lighting apparatus for discharge lamp An apparatus for lighting a discharge lamp is provided with an inverter circuit 3 for causing an input power supply 2 to generate the voltage required for a discharge lamp 1, a rectifying smoothing circuit 4 for rectifying and smoothing the output of the ... | 07/18/1995 |
| 5068570 | Lamp lighting circuit with an overload protection capability A lighting circuit for a metallic halide lamp for vehicular headlight applications is disclosed. Included are a pair of input terminals between which a battery is connected for feeding the lamp via a normally open relay switch which is closed upon energiz... | 11/26/1991 |
| 4520295 | Step-wise dimmer control circuit for a discharge lamp A dimming circuit for a discharge lamp (5) arranged in series with two electric coils (3, 4), one of which is by-passed by a semiconductor switching element (6). The control circuit of the semiconductor switching element (6) includes a series arrangement ... | 05/28/1985 |
| 4058752 | Dosimetry control method In a method of operating a photochemotherapy chamber for the irradiation of a patient with long wave ultraviolet light, a prescribed dosage is first selected. The prescribed dosage is then automatically converted into the time duration that an ultraviolet... | 11/15/1977 |
| 4045742 | High voltage shutdown circuit responsive to excessive beam current and high voltage A television receiver includes a conventional tri-color cathode ray tube display system having horizontal and vertical scansion systems. Conventional signal receiving and processing circuitry recovers picture, sound and scansion synchronizing information.... | 08/30/1977 |
