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| Number | Title | Issue Date |
| 8143802 | Method of driving discharge lamp, driving device, and projector A method for driving a discharge lamp that supplies an AC current to a discharge lamp having a first electrode and a second electrode so as to produce discharge and to cause the discharge lamp to emit light includes the steps of, during a steady operation in which t... | 03/27/2012 |
| 8129920 | Discharge lamp ballast and fixture with controlled preheating Electrical characteristics associated with a filament resistance are detected to control a preheating amount so as to heat a filament into an optimum state for emission in accordance with determined preheating time. A ballast for a discharge lamp includes an inverte... | 03/06/2012 |
| 8089214 | Driving method and driving device for discharge lamp, light source device, and image display device A driving method for a discharge lamp that lights by performing discharge between two electrodes while alternately switching a polarity of a voltage applied between the two electrodes includes: modulating an anode duty ratio, which is a ratio of an anode time for wh... | 01/03/2012 |
| 8040074 | Discharge-lamp lighting device and luminaire There is provided a discharge-lamp lighting device that, upon start-up of a high-intensity discharge lamp, alternately outputs a period A during which a starting circuit applies a high voltage to the high-intensity discharge lamp by resonance operation when a DC/AC ... | 10/18/2011 |
| 7956550 | Complementary application specific integrated circuit for compact fluorescent lamps In a lighting ballast there are typically several discrete components that combine to take an external AC signal and convert it to a DC signal, and back to an AC signal for powering a lamp. Several of these components can be housed on an application specific integra... | 06/07/2011 |
| 7800314 | Projector and driving method of light source for projector A projector includes an discharge lamp which has a first electrode and a second electrode and emits light by generating discharge between the first and second electrodes, and a driving system which supplies power by alternating polarities of the first electrode and ... | 09/21/2010 |
| 7489088 | Power supply for 2-line dimmer A power supply circuit for a dimmer switching device includes a voltage doubler circuit, a filter circuit, a switching power supply, and a linear regulator circuit. In one embodiment, the voltage doubler circuit includes a first stage having a first capacitor and a ... | 02/10/2009 |
| 7358685 | DC-DC converter having protective function of over-voltage and over-current and led driving circuit using the same The invention relates to a DC-DC converter having over-current/over-voltage protection function and an LED driving circuit using the same. The DC-DC converter adjusts a width of a switching pulse outputted from a Pulse Width Modulation (PWM) controller to control on... | 04/15/2008 |
| 7345340 | Semiconductor integrated circuit and a semiconductor device A semiconductor integrated circuit that has a quick response to changes in source/drain electrode voltage having an LDMOS transistor. The transistor has a second conduction type first well region formed in a first conduction type semiconductor substrate; a first con... | 03/18/2008 |
| 7334917 | Illumination device An illumination device comprising at least four luminous units (1, 2), the light emitted by at least two of the four luminous units (1, 2) being suitable for being mixed to form white light. Moreover, an apparatus (3) for dimming at least one of... | 02/26/2008 |
| 7315134 | Power supply for a high voltage device Control of an output pulse width by a PWM control circuit is stopped and the initial pulse string having a fixed pulse width is outputted in order to obtain a power supply voltage rise within a predetermined time period at the time of turning on the power. During no... | 01/01/2008 |
| 7274148 | Lamp having fixed forward phase switching power supply with time-based triggering A lamp contains a lamp voltage conversion circuit that is entirely within a base for converting a line voltage at a lamp terminal to an RMS load voltage at a light emitting element. The voltage conversion circuit includes a forward clipping circuit with a three-term... | 09/25/2007 |
| 7250731 | Primary side current balancing scheme for multiple CCF lamp operation A backlight system drives multiple lamps using balanced groups of serially-connected lamp transformers. A plurality of lamp transformers is divided into multiple transformer groups. Primary windings of the lamp transformers are coupled in series in each transformer ... | 07/31/2007 |
| 7247997 | Electroluminescent lamp driving circuit and method A driving circuit for driving an electroluminescent lamp is disclosed. The driving circuit includes an alternating current (AC) voltage generator for providing at an output an AC output voltage waveform for driving an electroluminescent lamp and a controller for con... | 07/24/2007 |
| 7242150 | Dimmer having a power supply monitoring circuit A two-wire dimmer for control of a lighting load from an alternating-current (AC) power source includes a semiconductor switch, a power supply, and a control circuit. The power supply includes an energy storage input capacitor that is able to charge only when the se... | 07/10/2007 |
| 7211966 | Fluorescent ballast controller IC A ballast control integrated circuit for driving at least one gas discharge lamp comprising a first oscillator circuit for producing a first oscillating signal; a driver circuit for driving first and second output transistors connected in a half bridge configuration... | 05/01/2007 |
| 7202611 | Discharge lamp lighting device A device for lighting a discharge lamp has a drive circuit to feed alternating power the discharge lamp, and a control circuit. The control circuit controls the drive circuit by a drive pulse to perform a burst dimming control over the discharge lamp. The control ci... | 04/10/2007 |
| 7187134 | Method of triggering at least one illuminating means and triggering circuit for practicing such method A system and method for illuminating a light source, particularly a vehicle light source. The light source receives a voltage signal causing the light source to be illuminated. A triggering circuit detects the voltage signal. If the voltage signal is at or below a p... | 03/06/2007 |
| 7170236 | Method of setting desired RMS load voltage in a lamp A method of converting a line voltage to a desired RMS load voltage in a lamp includes the steps of pulse width modulating a load voltage with a pulse width modulation circuit, triggering conduction in the pulse width modulation circuit independently of a line volta... | 01/30/2007 |
| 7170234 | Light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths A current of the same amount or in a constant ratio is applied to each of a combination of a blue light emitting diode having a small wavelength variation and a green light emitting diode having a large wavelength variation. With this, as an amount of applied curren... | 01/30/2007 |
| 7150806 | Spiral-shaped lamp for UV curing of coatings and bonding for a digital versatile disk (DVD) or compact disk (CD) A spiral-shaped lamp (10) is used for disk manufacturing processes, such as curing of coating or bonding, to provide uniform intensity of UV energy to the circular disk without requiring relative motion between the disk and the lamp during the curing process.... | 12/19/2006 |
| 7109666 | Lighting device for a dielectric barrier discharge lamp A lighting device for dielectric barrier discharge lamp according to the embodiment of the present invention includes a pulse number judging circuit 16. The judging circuit 16 is supplied with a dimming control signal LCS designating a dimming ratio of... | 09/19/2006 |
| 7049750 | Lamp having integral voltage controller A lamp includes a voltage conversion circuit that converts a line voltage to a desired RMS load voltage. The voltage conversion circuit is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage conversion circuit incl... | 05/23/2006 |
| 7045972 | Lighting method of ultra-high pressure mercury lamp A lighting device for an ac-lighting type ultra-high pressure mercury lamp includes: a stepdown chopper for converting dc voltage that is supplied from the outside to voltage of a prescribed level; a full-bridge switch circuit for generating either dc or ac voltage ... | 05/16/2006 |
| 7034471 | Cold-cathode tube operating apparatus The present invention can provide a cold cathode tube lighting apparatus capable of causing no pulsating current, intermittent oscillation, or flicker-off even under light load, stably keeping a cold cathode tube lighting, safely tuning on the same, and the like. Th... | 04/25/2006 |
| 7019469 | Sinewave dimmer control method An input line filter separates an ac sinusoidal power source from a power switching stage having a series switching section and a clamp switching section. Both the series switching section and a clamp switching section include complementary pairs of high power and h... | 03/28/2006 |
| 6914392 | Switching apparatus for operating discharge lamps The following circuit is proposed for discharge lamps having a particularly high starting voltage. An a.c. voltage generator (1) provides a corresponding a.c. voltage. A starting voltage generating device, which comprises a piezo transformer (2), is co... | 07/05/2005 |
| 6900601 | Control circuit of two current unidirectional switches A circuit for controlling two switches assembled in anti-parallel, comprising in series between two terminals of the anti-parallel assembly, two identical control stages respectively dedicated to each switch and between which is interposed a common impedance setting... | 05/31/2005 |
| 6892310 | Method for efficient supply of power to a microcontroller A method and a system for supplying power to a microcontroller with a single cell. One embodiment of the present invention discloses incorporation of a power supply pump circuit with the microcontroller and their dynamic interaction. The microcontroller sends its po... | 05/10/2005 |
| 6836078 | Circuit for lighting HID lamp A lighting circuit of confirming the insulation property of an HID lamp and a lighting circuit upon starting the operation of the HID lamp to previously prevent damages of the main circuit, and starting discharge at the lowest starting voltage in accordance with the... | 12/28/2004 |
| 6831425 | Xenon discharge lamp lighting device It is an object to provide a xenon discharge lamp lighting device with few or no lamp startup lighting failures, even when a xenon discharge lamp is near the end of its useful life. In the xenon discharge lamp, when a lamp voltage increases, from the ending point of... | 12/14/2004 |
| 6794827 | Multiple ballasts operable from a single DC bus A plurality of lighting ballasts (12, 14, 16) draw power from a single DC bus signal. A power factor correction circuit (10) rectifies and smoothes AC power to produce the DC bus signal. In order to prevent damage to the ballast (12) when a lamp... | 09/21/2004 |
| 6794829 | Method and apparatus for a protective ballast circuit A plurality of lighting ballasts (12, 14, 16) draw power from a single DC bus signal. A power factor correction circuit (10) rectifies and smoothes AC power to produce the DC bus signal. In order to prevent damage to the ballast (12) when a lamp... | 09/21/2004 |
| 6781324 | Ballast for at least one electric incandescent lamp A ballast for at least one electric incandescent lamp, having at least two switching elements (T1, T2) that are coupled to one another with the formation of a first tie point (VP1), a drive circuit (10) with at least one output for drivin... | 08/24/2004 |
| 6724158 | Power linearization technique for controlling the luminance of light emitting display devices A circuit and method for providing a linear power to a load uses pulse modulation technique where the frequency and pulse width of the pulse width modulated waveform driving the load are varied simultaneously. In one aspect of the disclosure, a pulse width modulator... | 04/20/2004 |
| 6674252 | Non-blinking direct current fluorescent lamp circuit A non-blinking direct current fluorescent lamp circuit includes a switch, a bridge rectifier, a voltage regulation circuit, a filter capacitor, an ignition circuit, a contact points converter, a ballasting circuit, and a pole exchange circuit. The switch ... | 01/06/2004 |
| 6657404 | Method and apparatus for power control A method and apparatus is disclosed to reduce power consumption of a load. In one embodiment a power control system selectively routes power directly to a load or to a power reduction device. A delay may occur prior to introduction of the power reduction ... | 12/02/2003 |
| 6621222 | Power-saving lamp A power-saving lamp is constructed to include a lamp head, a bulb fastened to the lamp head, a polygonal light emitting circuit assembly suspended from a bracket in the lamp head within the bulb, the polygonal light emitting circuit assembly having LEDs i... | 09/16/2003 |
| 6577075 | High intensity discharge lamp magnetic/electronic ballast A metal halide magnetic/electronic ballast with a compensation function for adjustment in autotransformer output voltage, which applies the compensation in various steps of voltage, to maintain the power constant. The metal halide ballast provides constan... | 06/10/2003 |
| 6504322 | Discharge lamp operating apparatus A discharge lamp operating apparatus includes a discharge lamp and a driving circuit of the discharge lamp. The driving circuit can vary power to be supplied to the discharge lamp and has a function to turn off the discharge lamp at a supplied power value... | 01/07/2003 |
