Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 8164271 | Uni-directional light emitting diode drive circuit in bi-directional power series resonance The present invention uses series connected capacitive impedance and inductive impedance, whereof the inherent series resonance and the frequency of the bi-directional power can produce series resonance, thereby the bi-directional divided power being generated at th... | 04/24/2012 |
| 7443109 | LED current pulse limiter arrangement An arrangement for supplying a constant current to at least one LED includes a current source (2; 2a, 2b) with an output capacitor (3) connected across the terminals of the current source. An output inductor (4) is associate... | 10/28/2008 |
| 7385357 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 06/10/2008 |
| 7382101 | Lighting system Disclosed is a lighting system capable of preventing damage to an outer-tube resulting from an outer-tube discharge that often occurs at the end of useful life of a lamp. The lighting system includes: a metal halide lamp having an arc tube housed within an outer tub... | 06/03/2008 |
| 7355351 | Circuit arrangement having a converter without a transformer but with an inductor for the pulsed operation of dielectric barrier discharge lamps Circuit arrangement having a converter without a transformer but with an inductor for the pulsed operation of dielectric barrier discharge lamps The circuit arrangement according to the invention comprises an inductor-type converter for the pulsed operation o... | 04/08/2008 |
| 7352136 | DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp A DC-DC converter reduces a surge voltage developed across a switching element (30) in making the voltage conversion with the use of a transformer (20) inherently having considerable leakage. A snubber circuit is included to absorb the surge energy and... | 04/01/2008 |
| 7196515 | Hall switch arrangement The Hall switch arrangement comprises a plurality of Hall switch elements connected in series with a first Hall switch element, wherein the first Hall switch element is formed to provide a first output signal, which has information about a switching state of the fir... | 03/27/2007 |
| 7180248 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 02/20/2007 |
| 7129647 | Electronic ballast with programmable processor An electronic ballast circuit includes a programmable processor. The processor is programmed to vary operating parameters of the ballast circuit to accommodate operation of different types and/or sizes of lamps. Ballast circuit operating parameters that can be varie... | 10/31/2006 |
| 7109665 | Three-way dimming CFL ballast A three-way dimming CFL ballast operates at a single high bus voltage while varying switching frequency to control lamp current. The ballast accepts three different light level input switch command positions and an off position to provide three different light outpu... | 09/19/2006 |
| 7075275 | DC-DC converter A DC-DC converter has switching means which generates a continuous switching voltage having a specified period from an input voltage and outputs the generated switching voltage, output voltage generating means which receives the switching voltage at an inductor and ... | 07/11/2006 |
| 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 |
| 6919697 | Power supply device and liquid crystal display device using the same The present invention relates to a power supply device for a backlight and a liquid crystal device using the power supply device. The power supply device and the liquid crystal display device using the same according to the present invention can drive a fluorescent ... | 07/19/2005 |
| 6917163 | Inductively powered lamp assembly A lamp assembly configured to inductively receive power from a primary coil. The inductively powered lamp assembly includes a lamp circuit including a secondary and a lamp connected in series. In a first aspect, the lamp circuit includes a capacitor connected in ser... | 07/12/2005 |
| 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 |
| 6876157 | Lamp inverter with pre-regulator An efficient power conversion circuit for driving a fluorescent lamp uses a pre-regulator to generate a regulated voltage with a relatively high level of ripple voltage. The regulated voltage can be varied to provide dimming of the fluorescent lamp. The regulated vo... | 04/05/2005 |
| 6825620 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 11/30/2004 |
| 6788010 | Operating appliance and an operating method for high-pressure lamps A high-pressure discharge lamp (Lp) is fed with a square-wave current from an operating appliance. In order to reduce overshoots during the commutation of the lamp current, the set current value for the regulating device (5, 6) which is contained in the opera... | 09/07/2004 |
| 6768271 | Ballast and method for operating a lamp The invention relates to a ballast for a lamp having an inverter which includes at least one switch (S1; S2), and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive ci... | 07/27/2004 |
| 6753659 | Operating device for discharge lamps having a preheating device An operating circuit for a discharge lamp (LP) having preheatable electrodes includes a device (C14, T11, T12, T13, G) for preheating the electrodes. The device includes a resonant circuit (C14, T11) which oscillates during ... | 06/22/2004 |
| 6734637 | Hot-restrike ignition system for a high-frequency high-intensity discharge lamp assembly A hot-restrike ignition system for a high-frequency high-intensity discharge lamp includes a resonant circuit that is connectable across the lamp in parallel with a ballast circuit that is used to provide steady-state current for the lamp. The resonant circuit is te... | 05/11/2004 |
| 6731071 | Inductively powered lamp assembly A lamp assembly configured to inductively receive power from a primary coil. The lamp assembly includes a lamp circuit including a secondary and a lamp connected in series. In a first aspect, the lamp circuit includes a capacitor connected in series with the lamp an... | 05/04/2004 |
| 6713965 | Microwave oven A microwave oven includes a filter unit having choke coils disposed on ground lines, to which low and high voltage units are grounded, and on a power line connected to a controller so as to block high frequency noise. Impedances of the ground and power lines are gre... | 03/30/2004 |
| 6700332 | Electrodeless discharge lamp system An electrodeless discharge lamp system includes an excitation coil placed in proximity of the electrodeless discharge lamp, a resonance circuit for supplying appropriate power to the excitation coil, and a high frequency power source driver and wherein, t... | 03/02/2004 |
| 6677716 | Operating device for gas discharge lamp Free-running half-bridge inverter (HP) for operating gas discharge lamps having a current transformer as a feedback device. The half-bridge transistors (T1, T2) are essentially voltage controlled transistors (MOSFET). The drive circuits (1, 2) for the hal... | 01/13/2004 |
| 6653800 | Ballast circuit with lamp cathode protection and ballast protection A ballast circuit for driving a fluorescent lamp is provided. The ballast circuit comprises: a self-oscillating circuit; and a series resonant circuit. The series resonant circuit comprises: an inductor; a capacitor; and two diodes. The arrangement of the... | 11/25/2003 |
| 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 |
| 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 |
| 6545429 | Lighting assembly having regulating transformer distally located from ballast A gas discharge lamp assembly is provided wherein the regulator housing and the ballast housing are placed remote from each other. Further, an ignitor and a capacitor are added to the circuitry of the ballast housing to allow for the regulator's remote pl... | 04/08/2003 |
| 6545428 | Light fixture with submersible enclosure for an electric lamp A light fixture with a submersible enclosure for an electric lamp (e.g, HID lamp) is disclosed. The fixture includes a ballast for supplying power to a high intensity discharge lamp. A submersible enclosure seals the lamp from water in normal operation. T... | 04/08/2003 |
| 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 |
| 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 |
| 6433493 | Electronic power converter for triac based controller circuits A ballast circuit operable with a triac based controller circuit, the ballast circuit (100) includes a rectifier (115) configured for operative connection with an associated triac based circuit (110) for converting AC current to DC current, a capacitor as... | 08/13/2002 |
| 6414447 | Discharge lamp lighting device and illuminating device A combination-type high frequency inverter connects an isolation leakage transformer, a smoothing condenser, a resonance condenser, a first field-effect transistor and a second field-effect transistor to a diode bridge and rectifies the voltage of an AC p... | 07/02/2002 |
| 6407507 | Personal electronic device having EL lamp and buzzer powered from a single inductor A personal electronic device includes and inverter having a single inductor for powering an EL lamp and a buzzer. The lamp and the buzzer are coupled together to the output of the inverter and are in parallel with each other or are coupled in series betwe... | 06/18/2002 |
| 6396220 | Lamp ignition with compensation for parasitic loading capacitance A ballast for powering a gaseous discharge lamp that has a required minimum ignition voltage and a permissible maximum ignition voltage. Via a cable through which ignition voltage pulses are delivered to the lamp. The ballast has a first state of operatio... | 05/28/2002 |
| 6377000 | Electronic ballast for gas discharge lamp An electronic ballast for a gas discharge lamp has a power source section for receiving a commercial AC to provide a DC voltage, and an inverter section, in response to a pair of switching driving signals, for switching and transforming an output voltage ... | 04/23/2002 |
| 6339296 | Low profile emergency ballast An emergency ballast for a low profile fluorescent lamp fixture including an AC ballast including an end of lamp life shut down circuit. The emergency ballast includes a timing circuit which operates when AC power is restored to the lamp fixture after the... | 01/15/2002 |
| 6316882 | Electronic ballast having a stable reference voltage and a multifunction input for soft dimming and ON/OFF control An electronic ballast for use in illuminating a lamp includes a voltage reference generator that uses a plurality of current amplifiers and resistors having substantially identical resistance characteristics to remain stable in response to temperature var... | 11/13/2001 |
| 6304039 | Power supply for illuminating an electro-luminescent panel A power supply is provided for illuminating an electro-luminescent lamp with a constant current and frequency drive signal having a predetermined limiting voltage level for compensating changes in the electro-luminescent lamp characteristics. The power su... | 10/16/2001 |
