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| Number | Title | Issue Date |
| 7368879 | Pendulum resonant converter and method A resonant switching converter comprising a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage, there being a first switched node between the switches; a second pair of series connected switc... | 05/06/2008 |
| 7355354 | Method for starting a discharge lamp using high energy initial pulse The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). Additionally, during striking of the CCFL, a higher energy initial energy pulse is used. During normal operation, a lower energy... | 04/08/2008 |
| 7339330 | Methods and circuits for instant hot restart of high intensity discharge lamps A lamp ballast for operating a high intensity discharge lamp includes an electronic ballast circuit to supply an operating voltage to the discharge lamp, and an igniter circuit to supply starting pulses to the discharge lamp in a cold state and to supply hot restrik... | 03/04/2008 |
| 7330000 | Discharge lighting bulbs control system A device comprising energy saving circuitry incorporated within lighting systems of the type utilizing discharge lamps, wherein the circuitry includes at least one transformer having a primary and secondary windings oppositely wound to establish different fields of ... | 02/12/2008 |
| 7327101 | Single point sensing for end of lamp life, anti-arcing, and no-load protection for electronic ballast Systems and methods are disclosed that facilitate sensing a pulse in a ballast circuit for a lamp when the lamp is in an end-of-life (EOL) stage or when the lamp is experiencing an arcing conduction condition, such as may occur when a contact between the lamp and it... | 02/05/2008 |
| 7316483 | Method of representing a video image by means of a projector The invention relates to a method of representing a video image based on a video signal by means of a projector which comprises an image display device and a high-pressure gas discharge lamp, which lamp is supplied with a square-wave alternating current (I0, ... | 01/08/2008 |
| 7288904 | Centralized control device for controlling the application of voltage to a load provided with a power factor correction capacitor A centralized device for supply voltage control of a load with power factor correction condensers for lighting engineering applications has an array converter for obtaining a portion of power, with a plurality of switches located between the network sinusoidal suppl... | 10/30/2007 |
| 7282869 | HID ballast and lamp tester The instant invention relates to an HID ballast and lamp tester, which provides visual indication of failure of either the ballast or lamp by continuously monitoring the status of the HID lighting system. The HID ballast and lamp tester detects and utilizes the volt... | 10/16/2007 |
| 7269940 | Ion engine grid arcing protection circuit An arcing protection circuit for the screen and accelerator grids of an ion thruster engine includes an impedance, which in one embodiment, is fixed, and in another, is variable, coupled in series between the accelerator grid of the engine and a current return path ... | 09/18/2007 |
| 7270300 | System and method for an ambient atmosphere ion thruster A system and a method for an ambient atmosphere ion thruster having a pair of permeable electrical members for accelerating ambient atmosphere ions which enter the thruster due to a craft's relative velocity. Neutral ambient atmosphere molecules in the intake mass f... | 09/18/2007 |
| 7259523 | Circuit arrangement In a bride circuit comprising a lamp choke that might partially saturate during the ignition of the lamp, at least one of the switches is switched off when the amount of charge displaced through it in forward direction equals a predetermined value. Despite the parti... | 08/21/2007 |
| 7256548 | Electric circuit for igniting a discharge lamp, and electric component module and discharge lamp incorporating such an electric circuit An electric circuit for igniting a discharge lamp includes a voltage source, and at least one condenser electrically connected to the voltage source. Further, a series chain is provided, electrically connected in parallel with the condenser, of at least one ignition... | 08/14/2007 |
| 7151330 | Apparatus and method for generating high voltages using a voltage inversion generator and multiple closed-path ferrites A vector inversion generator utilizes closed-path ferrites to modify the characteristics of the generator. The closed-path ferrites increase an inductance within a portion of the generator and additionally provide a protective shield for associated electronic circui... | 12/19/2006 |
| 7138769 | Device for operation of a high pressure discharge lamp and a projector device A device for operating a discharge lamp of the alternating current operating type has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are located and on which a trigger electrode is located, a feed device whi... | 11/21/2006 |
| 7102295 | Electronic device with illumination circuit and EL device utilizing the same An electronic device having an illumination circuit. The illumination circuit utilizes an AC current of an AC driving device to drive an illumination device such as an electroluminescent lamp and the remaining life of the AC driving device indicated by the brightnes... | 09/05/2006 |
| 7081718 | Power supply circuit for flash discharge tube A voltage is applied across the positive electrode and negative electrode of a flash discharge tube (xenon flash lamp) to emit light by a charge and discharge capacitor. This voltage application accumulates energy in a residual inductance existing in the circuit con... | 07/25/2006 |
| 7050287 | Sign ballast capacitor assembly A high voltage sign ballast capacitor assembly is disclosed. The assembly includes two components for the sign ballast operation, namely a main capacitor element for power factor correction and up to six starting capacitors for aiding in starting under cold weather ... | 05/23/2006 |
| 7042161 | Ballast with arc protection circuit FA ballast (20) for powering a gas discharge lamp (70) comprises an inverter (200) and an arc protection circuit (600). Arc protection circuit (600) monitors an electrical signal within the ballast. In response to occurrence of a d... | 05/09/2006 |
| 7019467 | Thermally-protected ballast for high-intensity-discharge lamps A ballast for electrical lighting fixtures with improved thermal protection features has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. The ballast preferably is of the ... | 03/28/2006 |
| 7009347 | Multiple discharge load electronic ballast system An embodiment of the present invention pertains to a multiple discharge load electronic ballast system, including a distribution bus and a plurality of electronic ballasts. The distribution bus has a nominal distribution power rating. The plurality of electronic bal... | 03/07/2006 |
| 6972529 | Switch mode power supply for a gas discharge lamp A switch mode power supply for igniting and operating a high-pressure gas discharge lamp includes an ignition sub-circuit which is coupled via a transformer to the circuit. The ignition sub-circuit has at least an ignition capacitor, and a switching element for disc... | 12/06/2005 |
| 6969957 | Ignition system for a high-frequency high-intensity discharge lamp system An ignition system for a high-frequency high-intensity discharge lamp system of a type used for location-lighting during filming or other entertainment venues includes a transformer with a pair of secondary windings, each having a primary winding closely interwound.... | 11/29/2005 |
| 6958579 | Thermally-protected ballast for high-intensity-discharge lamps A ballast for electrical lighting fixtures has improved thermal protection features. The ballast has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. When the ballast is o... | 10/25/2005 |
| 6940233 | Method and system of driving a CCFL To efficiently and cost-effectively produce a light source, a CCFL circuit can include a PMOS transistor, first and second NMOS transistors, and a high turns ratio transformer. The transformer can include a primary coil having a center tap, thereby forming first and... | 09/06/2005 |
| 6724155 | Lamp ignition circuit for lamp driven voltage transformation and ballasting system A lamp ignition circuit is provided which can initiate operation of a gas discharge lamp using a driving voltage which is similar in magnitude to the lamp operating voltage. The lamp ignition circuit is useful with a semi-resonant ballast and lamp circuit in which s... | 04/20/2004 |
| 6680583 | Sign lamp lighting transformer with protective functions An abnormality detection circuit detects abnormality relating to ground fault in secondary winding circuitry of transformer, non-grounding fault of transformer assembly casing or false connection of the AC power source to the transformer assembly in rever... | 01/20/2004 |
| 6674249 | Resistively ballasted gaseous discharge lamp circuit and method A circuit and method for running a metal halide arc discharge lamp from an AC power source. The circuit includes a rectifier for producing a DC voltage. The lamp is resistively ballasted by a current limiting filament connected in series with the lamp. Th... | 01/06/2004 |
| 6661184 | Light source device The restart properties of a light source even under the condition of a hot restart is improved, and suppression of the danger of an insulation breakdown in an unintended area is achieved by a light source comprising a discharge lamp in which a pair of mai... | 12/09/2003 |
| 6646389 | Discharge lamp ignition device, equipment and image forming apparatus An ignition device which ignites a discharge lamp comprises high-frequency voltage generator, a feeding harness line, and a lowpass filter. The high-frequency voltage generator includes a switch for generating a high-frequency voltage through high-frequen... | 11/11/2003 |
| 6642673 | Method and apparatus for disabling sodium ignitor upon failure of discharge lamp An ignitor disabling apparatus is provided to reliably and automatically disable a universal sodium ignitor with hot re-strike capability, or a 120 Hz pulse capability. The ignitor is configured to disable the ignitor portion of a HID lamp if the lamp fai... | 11/04/2003 |
| 6603275 | Electronic starter for fluorescent lamps An electronic starter for fluorescent lamp has a preheating circuit for controlling the preheating of the fluorescent tube and a power switch and locking circuit for cutting off the current to the preheating circuit. The power switch and locking circuit m... | 08/05/2003 |
| 6597128 | Remote discharge lamp ignition circuitry A starter circuit is provided for starting an HID lamp. The circuit de-couples the high voltage starting pulse from the input lines (ballast output lines) so that the starter can function properly regardless of the distance between the ballast and the lam... | 07/22/2003 |
| 6583586 | Brightness- regulating voltage-transforming circuit for high-pressure discharge lamp A brightness-regulating voltage-transforming circuit includes a pulse-width modulator (PWM); a transformer connected at a secondary side to a high-pressure discharge lamp; a voltage-transforming circuit having two transistors connected at bases to outputs... | 06/24/2003 |
| 6531833 | Single ballast for powering at least one high intensity discharge lamp A discharge lamp circuit includes a power source for creating a current flow. A ballast is electrically connected to the power source and controls the current flow produced by the power source. A capacitor is electrically connected in the ballast. At leas... | 03/11/2003 |
| 6498439 | Ballast for feeding a high-pressure gas discharge lamp A ballast for feeding a high-pressure discharge lamp. The ballast: supplies the lamp with an AC voltage at an ignition frequency (fi) during an ignition period (ti), supplies the lamp with an AC voltage at a glow frequency (fg) duri... | 12/24/2002 |
| 6437518 | Lighting circuit for an electric discharge lamp A lighting circuit 1 for an electric discharge lamp. The circuit includes a DC electric power source circuit 3, DC-AC conversion circuit 4 and starting circuit 5. The starting circuit 5 includes a primary circuit of a transformer has a condenser and switc... | 08/20/2002 |
| 6429597 | Externally mountable discharge lamp ignition circuit having visual diagnostic indicator An ignitor and ignitor monitoring device is provided which is externally and detachably mounted to a high intensity discharge (HID) luminaire. The ignitor monitoring device provides a visual indication of whether or not the ignitor of the lamp in the HID ... | 08/06/2002 |
| 6414446 | Switching device A switching device intended for igniting and operating a high-pressure discharge lamp, provided with a switch-mode power supply (smps) for supplying a controlled current to the lamp, and with a pre-conditioner for feeding the smps. The pre-conditioner is ... | 07/02/2002 |
| 6369521 | Starter circuit for an ion engine A starter circuit particularly suitable for a plasma of an ion engine for a spacecraft includes a power supply having an output inductor with a tap. A switch is coupled to the tap. The switch has a control input. A pulse control logic circuit is coupled t... | 04/09/2002 |
| 6369520 | Starter circuit for an ion engine A starter circuit particularly suitable for a plasma of an ion engine for a spacecraft includes a power supply having an output inductor with a tap. A switch is coupled to the tap. The switch has a control input. A pulse control logic circuit is coupled t... | 04/09/2002 |
