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| Number | Title | Issue Date |
| 8174202 | Lamp driving circuit A lamp driving circuit (10) for operating a discharge lamp has a series arrangement of a first and a second switching device (Q1, Q2) connecting supply voltage input terminals. An inverter resonant circuit (20, 30) shunts one of the switc... | 05/08/2012 |
| 7928662 | Voltage range extender mechanism An extended voltage range LED string driver comprising: an electronically controlled switch exhibiting a first port, a second port and a control port; a source of predetermined voltage connected to the control port of the electronically controlled switch; an LED str... | 04/19/2011 |
| 7868558 | Organic light emitting diode power converter A power converter circuit converts an AC line signal to a DC signal for powering an organic light emitting diode. The circuit uses only capacitive elements to limit current to the LED. Inductive and resistive elements are not included in the circuit to limit current... | 01/11/2011 |
| 7791284 | Cold cathode tube drive device A cold-cathode tube driving apparatus wherein the number of booster transformers has been reduced and the increase in installation space and in cost has been suppressed. This cold-cathode tube driving apparatus comprises a booster transformer (2); a plurality... | 09/07/2010 |
| 7692390 | Electron beam systems A high-power amplifier having a current-adding array is provided for high-speed driving of an inductive element, e.g., a deflection coil of an electron beam gun. The amplifier includes a first voltage node (U1) and a second voltage node (UV), a... | 04/06/2010 |
| 7443107 | Method and apparatus for controlling a discharge lamp in a backlighted display The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). The output is a fairly pure sine wave which is proportional to an input control voltage. The output waveform purity is ensured b... | 10/28/2008 |
| 7432665 | Method and device for driving a metal halide lamp A method for driving a lamp is described includes generating a light controlling DC electric field E with a desired direction and a desired strength inside the lamp such as to obtain a desirable ion distribution inside the lamp. The lamp is supplied with a commutati... | 10/07/2008 |
| 7432660 | IC-based low cost reliable electronic ballast with multiple striking attempts and end of lamp life protection The present invention relates generally to a simple, low cost ballast for fluorescent lamps that incorporates an integrated circuit and a number of ballast protection functions to cost effectively enhance its reliability. End of lamp life circuitry is provided to sh... | 10/07/2008 |
| 7397197 | Discharge lamp lighting circuit A discharge lamp lighting circuit includes a DC/AC converter, a starting circuit, a control unit, a plurality of switching elements driven by the control unit and a series LC resonance circuit. At the time of lighting the discharge lamp, the driving frequency of the... | 07/08/2008 |
| 7391163 | Apparatus of driving light source for display device An apparatus of driving a lamp for a display device is provided. The driving apparatus includes an inverter (920), a lamp current sensor (940), and an inverter controller (930). The lamp current sensor (940)senses a current flowing in the... | 06/24/2008 |
| 7365497 | Discharge lamp ignition device and projector To avoid the phenomenon of unsightly flickering in images projected by the projector, in high pressure discharge lamps—especially in high intensity discharge lamps, such as high pressure mercury lamps, metal halide lamps, and xenon lamps—that are used in project... | 04/29/2008 |
| 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 |
| 7336040 | Single-channel comprehensive protection circuit The present invention discloses a single-channel comprehensive protection circuit of a self-excitation half-bridge series resonant circuit having a single lamp output, including a DC block capacitor C3, a first partial pressure resistor R1, a s... | 02/26/2008 |
| 7323825 | Ballast integrated circuit (IC) A ballast integrated circuit (IC) for driving a first switching element and a second switching element includes: a variable gain amplifier (VGA) connected to a first input terminal connected to a resistor, for generating an output current signal according to a resis... | 01/29/2008 |
| 7312584 | Plasma-generation power-supply device A plasma-generation power-supply device includes a transformer connected to an alternating-current power-supply, a rectifier connected to the transformer, an inverter connected to the rectifier, a reactor inserted in series in a power line of an ozonizer that is sup... | 12/25/2007 |
| 7307386 | Process for operating a discharge lamp There is provided a process for operating a High Intensity Discharge (HID) lamp, having stable and transient operating phases, by a digitally controlled circuit that includes a DC supply and an inverter. During the stable operating phase of the lamp, the inverter's ... | 12/11/2007 |
| 7288898 | Automotive high intensity discharge lamp ballast circuit An electronic ballast for driving a high intensity discharge (HID) lamp is provided. The electronic ballast includes a voltage boost stage for receiving a DC input voltage and outputting a boosted DC output voltage with a controlled current. It further includes a sw... | 10/30/2007 |
| 7276864 | Discharge lamp lighting device and projection type image display apparatus having the same A computing circuit computes a target value of a current to be supplied to a discharge lamp and generates a pulse control signal for superpose a pulse current. Furthermore, the computing circuit controls a current control circuit so that a pulse current is superpose... | 10/02/2007 |
| 7268516 | Circuit for use with switched reluctance machines A switched reluctance machine is energized by phase circuits with four active switches, for example MOSFETs, arranged in a bridge configuration. The switches are capable of conducting current in both a first direction and a second direction and are capable of operat... | 09/11/2007 |
| 7242152 | Systems and methods of controlling light systems An embodiment of the invention is a system for generating control signals. The system may allow a user to generate an image, representation of an image, algorithm or other effect information. The effect information may then be converted to lighting control signals t... | 07/10/2007 |
| 7214934 | Radio frequency power generator A RF power generator for exciting inductively coupled plasma for spectrometry includes an induction coil for exciting the plasma as part of its load circuit. The load circuit also comprises a capacitor connected in parallel with the induction coil. The RF power gene... | 05/08/2007 |
| 7208883 | Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current directions of power supplies solves the malfunction of the power supplies vibr... | 04/24/2007 |
| 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 |
| 7183722 | Apparatus and method of driving lamp of liquid crystal display device A lamp driving apparatus of a liquid crystal display device includes m lamp groups in which a plurality of lamps generating light are disposed; n (n | 02/27/2007 |
| 7176635 | Apparatus and method for compensating for reduced light output of a light source having a lumen depreciation characteristic over its operational life A method, apparatus, and system for compensating for lamp lumen depreciation. The method includes operating the lamp under rated wattage for a period towards the first part of operating life of the lamp. Operating wattage is increased at one or more later times. Ene... | 02/13/2007 |
| 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 |
| 7173380 | Push-pull driver with null-short feature A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a full-bridge switching topology. The first and the second primary winding... | 02/06/2007 |
| 7170235 | Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp In a bridge circuit for operating a high pressure discharge lamp an additional switching element, a control circuit for driving the additional switching element, a resonant inductor and a resonant capacitor are incorporated. The additional components together form a... | 01/30/2007 |
| 7141937 | High-pressure discharge lamp operation device and illumination appliance having the same A full bridge circuit including four switching elements (Q1 to Q4) is alternated with a high switching frequency and a series-connected resonance circuit (5) including an inductor (L2) and a capacitor (C2) is made to resonate at a ... | 11/28/2006 |
| 7121684 | Garage light luminaire with circular compact fluorescent emergency lighting optics The present invention relates to a garage light assembly having a housing with a lamp mounting surface wherein a main high intensity discharge lamp and an auxiliary circular high output fluorescent lamp are mounted. The auxiliary lamp is mounted centrally within the... | 10/17/2006 |
| 7112929 | Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system A driver circuit or controller flexibly drives either a half-bridge or a full-bridge switching network in a backlight inverter without modification, redundant circuitry or additional components. The driver circuit includes four outputs to provide four respective dri... | 09/26/2006 |
| 7112930 | Device and method for detecting high voltage A non-contact voltage detecting method and device are provided. The non-contact voltage detecting device includes a discharge lamp having an excitation voltage and a lighting voltage applied thereon, a boost circuit coupled to the discharge lamp for providing an ope... | 09/26/2006 |
| 7109667 | Discharge lamp driving apparatus A discharge lamp driving apparatus comprises a DC power supply, a control circuit, switching elements, a step-up transformer, and a lamp current controlling circuit. In the discharge lamp driving apparatus, the secondary side of the step-up transformer is connected ... | 09/19/2006 |
| 7098604 | Solar powered lamp having an auxiliary startup device Disclosed is a solar powered lamp adopting a cold-cathode fluorescent lamp and an auxiliary startup device which can improve the efficiency of the voltaic-photo transformation when lighting the cold-cathode fluorescent lamp. The device comprises a direct current pow... | 08/29/2006 |
| 7091676 | Arc maintenance device for high density discharge lamps including an adaptive wave form monitor A supplemental arc maintenance electrical supply for a high density discharge (HID) lamp (L) for applying a high frequency supplemental arc voltage to maintain the arc during a period of unstable or intermittent AC supply in addition to or in lieu of the voltage or ... | 08/15/2006 |
| 7075251 | Universal platform for phase dimming discharge lighting ballast and lamp A ballast, or power supply circuit, for gas discharge lamps of the type using IC control based gate-drive circuitry for controlling a pair of serially connected switches of a d.c.-a.c. inverter. More particularly, the invention relates to a ballast having a resonant... | 07/11/2006 |
| 7061190 | Circuit arrangement and operating device for operating lamps The invention relates to circuit arrangements for operating lamps and to operating devices which contain such circuit arrangements. A first stage of a circuit arrangement according to the invention comprises a SEPIC known from the literature. The SEPIC provides a DC... | 06/13/2006 |
| 7061188 | Instant start electronic ballast with universal AC input voltage The present invention relates to an electronic ballast that energizes fluorescent lamps connected in a parallel configuration. The ballast employs a power factor correcting boost converter that can be used over a wide range of AC line voltages to provide regulated p... | 06/13/2006 |
| 7045964 | Emergency lighting system with automatic diagnostic test An emergency lighting system powers all the luminaires of a lighting system during normal use, and switches from utility power to an emergency power source to drive some of the luminaires during a power outage. The typical on/off wall switch control for regular use ... | 05/16/2006 |
| 7042204 | Voltage source and current source with capacitor In a voltage source according to the present invention, a switching transistor (Q1) is turned on when the voltage of an electrolytic capacitor (C1) exceeds a predefined positive voltage level (E1), to keep the electrolytic capacitor (C1) ... | 05/09/2006 |
