Simultaneous Application To The Load Device Patents (Class 315/176)
  • Patent number: 11017988
    Abstract: An charged particle beam apparatus includes: a gas introduction chamber to which raw gas is introduced; a plasma generation chamber connected to the gas introduction chamber; a coil wound around an outer circumference of the plasma generation chamber and receiving a high-frequency power; an extraction electrode applying an extraction voltage to plasma discharged from a plasma aperture at an outlet of the plasma generation chamber; an ampere meter measuring a magnitude of a plasma current caused by the plasma moved out of the plasma aperture; an extraction voltage calculator calculating, based on variation in the magnitude of the plasma current measured by the ampere meter with respect to variation in the extraction voltage, an extraction voltage set value; and a controller controlling the extraction voltage based on the extraction voltage set value calculated by the extraction voltage calculator.
    Type: Grant
    Filed: September 16, 2019
    Date of Patent: May 25, 2021
    Assignee: HITACH HIGH-TECH SCIENCE CORPORATION
    Inventors: Hiroshi Oba, Yasuhiko Sugiyama, Yasutaka Otsuka
  • Patent number: 10714563
    Abstract: The present disclosure relates to a display device. The display device according to an exemplary embodiment includes a display area comprising a plurality of pixels, a peripheral area that is disposed outside the display area, and a wiring portion in the peripheral area. The wiring portion includes a plurality of signal lines that are adjacent to each other and are arranged along a first direction and each extends in a second direction that is different from the first direction. The plurality of signal lines are arranged in an order of average voltages of signals respectively transmitted by the plurality of signal lines during one frame.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: July 14, 2020
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dong-Hyun Lee, Hyeon-Do Park, Ha Gyeong Song, Hyun Young Choi
  • Patent number: 10039175
    Abstract: A delay module is used with one or more lighting fixtures that receive an AC signal from an electrical circuit. The delay module includes an input node, which is coupled to the electrical circuit, and an output node, which is coupled to a driver module of one or more lighting fixtures. When an AC signal is initially presented to the electrical circuit, such as when a wall controller is switched to an on state, the delay module will provide, or maintain, an open circuit between the input node and the output node for a predetermined delay period. When the delay period expires, the delay module will provide a closed circuit between the input node and the output node, wherein the AC signal is passed from the electrical circuit to the driver module of the associated lighting fixture(s).
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: July 31, 2018
    Assignee: Cree, Inc.
    Inventor: Gerry Farrel Thornton
  • Patent number: 9203259
    Abstract: A sensing device includes a sensing transmitting module and a sensing receiving module respectively mounted in a first housing and a second housing. And an output terminal of the sensing transmitting module and an input terminal of the sensing receiving module are provided with a sensing coil and an electromagnetic rod respectively, the first housing and the second housings are cooperated with each other, and the electromagnetic rod is inserted into the sensing coil, so that the sensing coil or the electromagnetic rod is placed in magnetic field generated by the electromagnetic rod or the sensing coil thereby generating sensing voltage. The sensing parts are formed of the sensing coil and the electromagnetic rod, which significantly reduces the amount of the copper wires in the sensing coil and the electromagnetic rod, therefore the sensing device has a smaller size, lighter weight and lower cost.
    Type: Grant
    Filed: February 25, 2012
    Date of Patent: December 1, 2015
    Assignee: JIE DU ELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Guangshi Tang, Shaoming Yu
  • Patent number: 8729805
    Abstract: A plasma generator has a first member 2 containing a dielectric material, and an electrode group composed of a plurality of electrodes and including a first assembly 6 partially including a plurality of electrodes and a second assembly 7 partially including a plurality of electrodes. In accordance with an AC voltage, the first assembly 6 generates a plasma in a first space 23 contacting the first member 2. In accordance with a DC voltage, the second assembly 7 generates an electric field in a second space 24 contacting the first member 2 and communicating with the first space 23. At least one or more electrodes of a portion of the first assembly 6 and at least one or more electrodes of a portion of the second assembly 7 are provided on the surface of or in the inside of the first member 2.
    Type: Grant
    Filed: January 19, 2009
    Date of Patent: May 20, 2014
    Assignee: Kyocera Corporation
    Inventors: Takashige Yagi, Hiroshi Makino, Shingo Sato
  • Patent number: 8710755
    Abstract: The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: April 29, 2014
    Assignee: Richtek Technology Corporation
    Inventors: Pei-Yuan Chen, Chia-Wei Liao, Jing-Meng Liu, Leng-Nien Hsiu
  • Publication number: 20140070709
    Abstract: A method of arranging power-lines between a power supply circuit and a display panel in an organic light emitting display device, the method including: substantially symmetrically arranging first high power-lines between the power supply circuit and the display panel, the first high power-lines being configured to concurrently transmit a first high power voltage to first pixels; substantially symmetrically arranging second high power-lines outside of the first high power-lines between the power supply circuit and the display panel, the second high power-lines being configured to concurrently transmit a second high power voltage to second pixels; and substantially symmetrically arranging third high power-lines outside of the second high power-lines between the power supply circuit and the display panel, the third high power-lines being configured to concurrently transmit a third high power voltage to third pixels.
    Type: Application
    Filed: June 6, 2013
    Publication date: March 13, 2014
    Inventors: Hae-Yeon LEE, Young-In HWANG, Yong-Jae KIM, Wang-Jo LEE
  • Publication number: 20130264951
    Abstract: An LED based light comprises at least one LED; and at least one thermoelectric generator having a first side and a second side, wherein the first side is thermally coupled to the at least one LED such that heat generated by the at least one LED is passively conducted to the at least one thermoelectric generator, producing a temperature differential between the first side and second side, wherein the at least one thermoelectric generator is configured to produce electrical energy from the temperature differential.
    Type: Application
    Filed: June 6, 2013
    Publication date: October 10, 2013
    Inventors: David L. Simon, John Ivey, James R. Scapa
  • Patent number: 8310171
    Abstract: A programmable LED constant current driver circuit for driving LEDs at constant current and dimming the LEDs using standard, off-the-shelf dimmers is provided. The current driver circuit of the present disclosure includes a temperature compensation feature which controls the on time for the LEDs based on a measured temperature of the current driver and associated circuits. In another embodiment, the current driver circuit is designed to receive a 24 VAC input and drive one or more LEDs in a transformer-based system dimming system.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: November 13, 2012
    Assignee: LED Specialists Inc.
    Inventors: William Reisenauer, Kevin Cannarili, Stephen Sacks
  • Patent number: 8120261
    Abstract: An organic electroluminescence display device is disclosed. The display comprises pixels which emit light according to data signals by controlling current from a pixel power supply through an organic light emitting diode, and to a ground power supply. In order to eliminate an initial glare, the pixel power supply is gradually provided to the pixels, and after a delay, the ground power supply is then gradually provided to the pixels.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: February 21, 2012
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Sung-Cheon Park, Wook Lee
  • Publication number: 20120032092
    Abstract: A focused ion beam (FIB) system is disclosed, comprising an inductively coupled plasma ion source, an insulating plasma chamber containing the plasma, a conducting source biasing electrode in contact with the plasma and biased to a high voltage to control the ion beam energy at a sample, and a plurality of apertures. The plasma within the plasma chamber serves as a virtual source for an ion column comprising one or more lenses which form a focused ion beam on the surface of a sample to be imaged and/or FIB-processed. The plasma is initiated by a plasma igniter mounted near or at the column which induces a high voltage oscillatory pulse on the source biasing electrode. By mounting the plasma igniter near the column, capacitive effects of the cable connecting the source biasing electrode to the biasing power supply are minimized. Ion beam sputtering of the apertures is minimized by proper aperture materials selection.
    Type: Application
    Filed: October 19, 2011
    Publication date: February 9, 2012
    Applicant: FEI COMPANY
    Inventors: Anthony Graupera, Sean Kellogg, Tom Miller, Dustin Laur, Shouyin Zhang, Antonius Bastianus Wilhelmus Dirriwachter
  • Patent number: 8044597
    Abstract: A drive circuit for a fluorescent display that can prevent generation of reactive power in a Zener diode used to generate a cutoff bias voltage. In one embodiment, the drive circuit operates as a single ended primary inductor converter (SEPIC) circuit and includes an input side closed circuit, an output side closed circuit, and a coupling capacitor connecting the two closed circuits. The input side closed circuit includes an input power source, a first inductor and a switching element. The output side closed circuit includes a second inductor, a diode and a second capacitor. A filament of the fluorescent display is connected to the second capacitor. One end of a Zener diode is connected to a negative potential side of the filament and the other end of the Zener diode is connected to an input power source.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: October 25, 2011
    Assignee: Futaba Corporation
    Inventor: Hideki Oku
  • Publication number: 20110234107
    Abstract: An LED based light and a method of providing power to the LED are disclosed. The LED based light includes at least one LED and at least one thermoelectric generator having a first side and a second side. The first side is thermally coupled to the at least one LED such that heat generated by the at least one LED is conducted to the at least one thermoelectric generator, producing a temperature differential between the first side and second side. The at least one thermoelectric generator is configured to produce electrical energy from the temperature differential.
    Type: Application
    Filed: March 25, 2011
    Publication date: September 29, 2011
    Applicant: ALTAIR ENGINEERING, INC.
    Inventors: David L. SIMON, John IVEY, James R. SCAPA
  • Patent number: 7891820
    Abstract: The invention discloses a method for igniting a lamp of a projector. The method includes steps of: (a) sensing a first temperature difference in response to power-off of the projector; (b) in response to power-on of the projector, detecting an aftercooling time and judging whether it is smaller than a predetermined cooling time, if YES, perform step (c); otherwise, perform step (g); (c) sensing a second temperature difference; (d) judging whether a ratio of the second temperature difference to the first temperature difference is larger than a threshold, if YES, perform step (e); otherwise, perform step (g); (e) calculating a re-cooling time; (f) controlling a fan to operate for the re-cooling time to cool the lamp down; and (g) igniting the lamp.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: February 22, 2011
    Assignee: BenQ Corporation
    Inventors: Chi-Hung Hsiao, Chun-Ming Shen, Ke-Chun Chuang
  • Publication number: 20100320916
    Abstract: A plasma generator has a first member 2 containing a dielectric material, and an electrode group composed of a plurality of electrodes and including a first assembly 6 partially including a plurality of electrodes and a second assembly 7 partially including a plurality of electrodes. In accordance with an AC voltage, the first assembly 6 generates a plasma in a first space 23 contacting the first member 2. In accordance with a DC voltage, the second assembly 7 generates an electric field in a second space 24 contacting the first member 2 and communicating with the first space 23. At least one or more electrodes of a portion of the first assembly 6 and at least one or more electrodes of a portion of the second assembly 7 are provided on the surface of or in the inside of the first member 2.
    Type: Application
    Filed: January 19, 2009
    Publication date: December 23, 2010
    Applicant: KYOCERA CORPORATION
    Inventors: Takashige Yagi, Hiroshi Makino, Shingo Sato
  • Publication number: 20100298912
    Abstract: A system for recapturing light emitted by a light source and converting that light into electrical current which can be used to power the same light source or other devices. An exemplary embodiment may use photovoltaic cells to recapture light from ceiling lights and convert it into a source of power for the ceiling light. Another embodiment may be a tanning bed that recaptures light using photovoltaic cells. Some embodiments may recapture light from multiple lighting fixtures. An exemplary embodiment may include a computer and battery for storing energy produced by the photovoltaic cells. Another exemplary embodiment is a method of recapturing light emitted by a light source and converting the light into energy which can be used to power electrical activities.
    Type: Application
    Filed: August 2, 2010
    Publication date: November 25, 2010
    Inventor: Trace ROUDA
  • Publication number: 20100220039
    Abstract: A DC-DC converter generates a first power and a second power for driving pixels in an organic light emitting display, such that the voltages of the first power and the second power are substantially independent of the voltage from a power supply or a battery. A voltage detector detects the voltage from the power supply, and a booster circuit and an inverter circuit respectively boost and invert the voltage from the power supply to generate and output the first and the second powers, respectively, for the pixels. A PWM controller controls the booster circuit and the inverter circuit to control voltages of the first power and the second power. The booster circuit is adapted to reduce the voltage from the power supply to be lower than the voltage of the first power when the voltage from the power supply detected by the voltage detector is higher than a reference voltage.
    Type: Application
    Filed: November 24, 2009
    Publication date: September 2, 2010
    Inventors: Sung-Cheon Park, Su-Yeon Yun
  • Publication number: 20090224681
    Abstract: A hybrid lamp assembly according to the present invention comprises several different primary components, specifically, a lamp, lamp housing, and controller. The lamp may be powered by either of two different alternative power sources, a solar panel and grid power, and a combination of power from the solar panel and the grid power. An indicator lamp houses two LEDs that indicate the status of the lamp and which power sources are providing current to the lamp, and the relative amount of current being supplied. The hybrid lamp assembly may optionally include an emergency backup battery system to power the lamp when no grid power is available.
    Type: Application
    Filed: March 9, 2009
    Publication date: September 10, 2009
    Applicant: S & A Solar Technologies, Inc.
    Inventors: Stan Bassford, Glenn Bateman
  • Patent number: 7285923
    Abstract: An apparatus and method is disclosed for controlling a display driving pulse to drive an LED display. In one embodiment, an RGB signal is received and a period during which all the LEDs are switched off is detected. Also, the period during which an image is not being displayed is also detected. The driving time of each LED is then extended by the detected periods so that the lighting time of the LED is extended, and brightness of the display as a whole is improved using the LED system.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: October 23, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Byung-Cheol Yu
  • Patent number: 7049756
    Abstract: A capacitive load driving circuit (1) for charging and discharging a capacitive load (11) is provided with a voltage divider (5) for dividing a power supply voltage (VH) into a plurality of different voltages (V1–V9), a plurality of condensers (2a–i) to which the voltages (V1–V9) are respectively charged as terminal voltages, and a switch (7) for switching connections between the capacitive load (11) and the condensers (2a–i), the switch (7) sequentially connecting the condensers (2a–i) in an ascending order of the terminal voltages so that electrostatic energy is supplied to the capacitive load (11) when the capacitive load (11) is charged, the switch (7) sequentially connecting the condensers (2a–i) in a descending order of the terminal voltages so that electrostatic energy is collected from the capacitive load (11) when the capacitive load (11) is discharged.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: May 23, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiko Aiba, Takasumi Wada, Hirokazu Fujita
  • Patent number: 6956335
    Abstract: A circuit arrangement for operating a lamp including a first circuit and a second circuit. The first circuit generates a second DC voltage from a first DC voltage and includes a transformer. The second circuit is coupled to the secondary winding of the transformer and supplies current for the lamp. The secondary winding, input terminals of the first circuit and second circuit are coupled together such that the second circuit is provided with a voltage whose amplitude is equal to the sum of the first DC voltage and the second DC voltage resulting in a more efficient transfer of power by the circuit arrangement to the lamp.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: October 18, 2005
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Johannes B. A. Van Der Hoofden, Jozef W. J. Maes
  • Patent number: 6507333
    Abstract: A display is provided with an insulative layer with electrical properties which have been selected so that the display can be addressed with a stylus and which minimizes the effects of stray triboelectrically generated charges. Also provided is a method of addressing such a display by depositing charges on a surface of the display, maintaining sufficient charge to effect an image change, and then removing the charges.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: January 14, 2003
    Assignee: Xerox Corporation
    Inventors: James C. Mikkelsen, Jr., Nicholas K. Sheridon, Edward A. Richley
  • Patent number: 6504323
    Abstract: Disclosed a high pressure discharge lamp driving apparatus for driving a high pressure discharge lamp during a stable operation thereof with an AC lamp current alternating for opposite half-cycle periods, the apparatus comprising an AC lamp current supply for supplying the AC lamp current to the high pressure discharge lamp, a detector for detecting the output AC lamp current to the high pressure discharge lamp, a controller responsive to the detector for controlling the AC supply to output the AC lamp current with a waveform which is characterized by that (i) a mean value in the second half of each half-cycle period is larger than the means value of the first half of each half-cycle period, (ii) no pulse current is contained in the second half of each half-cycle period, (iii) the AC lamp current has a maximum value immediately after polarity change between the positive and negative half-cycle periods, and (iv) the AC lamp current has also a waveform defined by that the ratio (d/a) of the maximum value (d) of
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: January 7, 2003
    Assignee: Harison Toshiba Lighting Corp.
    Inventors: Tokuji Yuda, Junichi Katoh
  • Patent number: 6465969
    Abstract: The present invention includes a smart controller for electroluminescent lamps which compensates for a range of RC time constants and adjusts its output frequency accordingly such that a relatively uniform light output is obtained on all illuminated areas of large EL display panels. The controller incorporates a device which monitors the current as the pulse train is applied to the EL panel. A sensing circuit determines if the current decayed to zero during the positive portion of the pulse. If the current did not decay to zero, the frequency is decreased until a decay to zero is sensed. Uniform light output is thus maintained from panel to panel, regardless of RC time constant differences between different EL panels, or variations in panel electrical characteristics over time. In an alternate embodiment of the present invention, several different frequencies are applied to the EL panel nearly simultaneously.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: October 15, 2002
    Assignee: Lumimove, Inc.
    Inventors: Matthew Murasko, Patrick J. Kinlen, Clarence H. Duttlinger, Jr., Donald S. Landy
  • Patent number: 6225754
    Abstract: A method and apparatus for operating a high pressure discharge lamp is disclosed. Oscillation in the discharge arc periphery, a problem that occurs with high frequency operation, is eliminated. A high pressure discharge lamp is operated by applying thereto a dc or rectangular wave current to which is superposed an ac component shaped by a high frequency ripple signal that has been amplitude modulated by a modulation signal for inducing instantaneous fluctuations in the power supply input to both ends of the arc gap. The ripple level is thereby temporally varied, and stable operating is possible even exceeding the ripple level at which oscillation in the arc periphery begins.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: May 1, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Makoto Horiuchi, Kiyoshi Takahashi, Mamoru Takeda
  • Patent number: 6111362
    Abstract: An EL lamp is powered by bursts of high frequency signal repeated at low frequency, i.e. having a low duty cycle envelope, in order to shift the color of light emitted by the phosphor in the lamp without degrading the life of the lamp. The bursts include one or more consecutive cycles of a high frequency signal or several closely spaced cycles of a high frequency signal.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: August 29, 2000
    Assignee: Durel Corporation
    Inventors: William A. Coghlan, Charles I. Zovko, Edward L. Kinnally
  • Patent number: 6107757
    Abstract: A fluorescent lamp operating apparatus is used for operating a fluorescent lamp, which includes a glass tube coated with a phosphor and has at least mercury sealed therein, by generating an electric field in a direction from an inner surface of the glass tube toward a center of the glass tube. The operating apparatus, for example, includes: a ballast circuit connected to the fluorescent lamp for starting the fluorescent lamp; a potential application member disposed so as to at least partially surround discharge plasma generated in the fluorescent lamp; and a potential application circuit for applying a potential to the potential application member. In such a case, the potential application circuit applies a potential to the potential application member which is higher than the potential of the discharge plasma.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: August 22, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Satoshi Kominami, Kouji Miyazaki, Shigeru Horii, Mamoru Takeda
  • Patent number: 6005356
    Abstract: A method and apparatus for operating a high pressure discharge lamp is disclosed. Oscillation in the discharge arc periphery, a problem that occurs with high frequency operation, is eliminated. A high pressure discharge lamp is operated by applying thereto a dc or rectangular wave current to which is superposed an ac component shaped by a high frequency ripple signal that has been amplitude modulated by a modulation signal for inducing instantaneous fluctuations in the power supply input to both ends of the arc gap. The ripple level is thereby temporally varied, and stable operating is possible even when exceeding the ripple level at which oscillation in the arc periphery begins.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: December 21, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Makoto Horiuchi, Kiyoshi Takahashi, Mamoru Takeda
  • Patent number: 5982098
    Abstract: An uninterruptible power source for emergency lighting in an AC powered electrical system utilizes X-10 protocol transmitters and receivers for transmitting and receiving data signals over existing wiring to emergency wall switches interposed in the wiring for maintaining emergency lighting in the on condition when AC commercial power is interrupted and a battery powered backup unit converting DC to AC is activated upon the interruption of the commercial AC source.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: November 9, 1999
    Inventor: Robert Redgate
  • Patent number: 5861718
    Abstract: An arc lamp igniter circuit (10) employs a resonant inverter circuit (16) to convert low-voltage DC to a relatively high-voltage, 80 kilohertz sinusoidal AC voltage that is rectified and voltage-doubled (42, 44, 46) to about 2,500 volts DC for repetitively charging an igniter capacitor (50) until it discharges through a spark gap (58) and a primary winding (54) of a compact, low-mass igniter transformer (52). A secondary winding (56) of the igniter transformer provides repetitive 20 kilovolt pulses, which are sufficient to ionize a metal halide arc lamp (14), causing it to ignite and produce intense illumination.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: January 19, 1999
    Assignee: In Focus Systems, Inc.
    Inventor: Henry Frazier Pruett
  • Patent number: 5838114
    Abstract: A power supply quickly restarts an electrodeless lamp which is temporarily turned off in an application using microwave radiation generated by a magnetron. When the electrodeless lamp operates in a full power mode, the power supply provides full power to the magnetron via high DC current and high DC voltage. When a user selectively switches the electrodeless lamp off, less power is provided to the magnetron than in the full power mode. In the reduced power mode, the magnetron generates sufficient microwave radiation to maintain the bulb plasma in an ignited condition while the lamp produces substantially no light output. This eliminates the required cooldown delay associated with the lamp shut down and quickly brings the lamp to the full power operation when requested by the user.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: November 17, 1998
    Assignee: Fusion Systems Corporation
    Inventors: Ernest G. Penzenstadler, Gungor Aktas
  • Patent number: 5825133
    Abstract: A fluorescent lamp drive circuit is disclosed. The fluorescent lamp drive circuit includes first filament drive circuitry coupled to the filaments of the lamp for driving the fluorescent lamp with a first waveform having sufficient amplitude such that gases in the fluorescent lamp are not allowed to extinguish during a prolonged period of operation. The fluorescent lamp drive circuit also includes second filament drive circuitry coupled to the filaments of the lamp for adjustably driving the fluorescent lamp with a second waveform during the prolonged period of operation. The second waveform has an amplitude which is adjustable over a wide range of voltages to achieve a wide range of fluorescent lamp luminance levels. Synchronization circuitry provides an input to the second filament drive circuitry to automatically facilitate the efficient transfer of power from the second filament drive circuitry to the fluorescent lamp over a wide range of lamp pressures and operating temperatures.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: October 20, 1998
    Assignee: Rockwell International
    Inventor: David W. Conway
  • Patent number: 5729095
    Abstract: A high frequency (HF) lighting apparatus includes a rare gas discharge lamp and a power supply. The lamp has an envelope having a rare gas therein. A pair of electrodes is provided in the envelope, and an external conductor is provided near the envelope. The power supply includes a HF electric power circuit to generate a HF electric power. The HF electric power circuit has an output whose crest factor is 2.3 or more. The power supply has a ballast coupled between the HF electric power circuit and the lamp for applying stabilized HF current to the lamp. The power supply further has a DC supply circuit including a rectifier for rectifying the HF to DC and a voltage divider. The voltage divider is disposed between the lamp and the rectifier for applying a potential to the external conductor of the lamp and for adding a DC current to the stabilized HF current.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: March 17, 1998
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Teiji Shimokawa, Akio Ishizuka
  • Patent number: 5717293
    Abstract: A strike enhancement circuit for a dc power supply, which can be a switched half-bridge supply, creates a high voltage at high impedance to initiate a plasma in a plasma chamber or sputtering chamber. The strike circuit has a plurality of diode bridges that act as full-wave rectifiers or peak detectors. The transformer secondary of the power supply is connected through isolation capacitors to the ac inputs of each of the diode bridges. The dc ports of the diode bridges are stacked in series, and the combined, stacked voltage is applied across the input terminals of the plasma chamber. Each diode bridge also has a storage capacitor connected between the positive and negative dc ports. Positive and negative voltage peaks from the transformer secondary waveform are stored in the storage capacitors. The combined dc outputs applied to the plasma chamber appear as a voltage high enough to initiate a plasma discharge.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: February 10, 1998
    Assignee: ENI Technologies, Inc.
    Inventor: Jeff C. Sellers
  • Patent number: 5714845
    Abstract: A high pressure gas discharge lamp is operated with normal output by at least predominantly low frequency energy supplied from a conventional power supply unit, and is operated at lower than 25 percent of the normal output by at least predominantly high frequency energy supplied from an electronic power supply unit. The electric output fed to the lamp is controlled. At any level of operation, a steady burning of the lamp for saving service life of the lamp is guaranteed. The switching arrangement, in addition to a conventional power supply unit, has an electronic power supply unit. The electronic power supply unit feeds the lamp with energy at a frequency which is higher than that of the energy supplied from the conventional power supply unit.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: February 3, 1998
    Assignee: Eta Plus Electronic GmbH u. Co. KG
    Inventors: Wolfgang Heering, Peter Schwarz
  • Patent number: 5710487
    Abstract: An improved energizing circuit for starting and regulating a gaseous discharge lamp. The circuit is 100% solid state and does not require the use of any inductive components or any filaments for its proper operation. The circuit is made up of several sub-circuits including a rectifying and voltage-doubling circuit, a second multiplying circuit, a low power oscillating circuit and a high voltage amplifier circuit. A high frequency AC signal is used to ionize the gas and ignite the lamp, while a DC signal is generated by the circuit to keep the lamp illuminated once it is ignited. The size and weight of the integrated circuit ballast are such that it could be incorporated into the fluorescent lamp package itself.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: January 20, 1998
    Inventor: Francisco Javier Velasco Valcke
  • Patent number: 5705896
    Abstract: A feedback control system for electronic ballast comprises a lamp, an electronic ballast, a multiplier, a time controller, a first adder-subtracter, a reference voltage generator, a second adder-subtracter, an error amplifier, a capacitor, a voltage controlled current source VCCS, a third adder-subtracter and an oscilloscope and output driver.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: January 6, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Nak Choon Choi
  • Patent number: 5680016
    Abstract: A transformerless ballast for a gaseous discharge lamp is disclosed. The ballast comprises: a rectifier; a filter for the rectifier output; a voltage divider for the filter output; an electronic gate modulating the filter output to power a lamp when the lamp is lit; a controller controlling the electronic gate responsive to variations in lamp impedance and to variations in the voltage divider output; an oscillator generating an output for predetermined period of time until after the lamp is lit; and an amplifier receiving and amplifying the oscillator output for powering the lamp when the lamp is unlit.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: October 21, 1997
    Inventor: Francisco Javier Velasco Valcke
  • Patent number: 5589739
    Abstract: A circuit for operating a discharge lamp includes input terminals for connection to a supply voltage source and a first apparatus coupled to the input terminals for generating a low-frequency alternating current from a supply voltage delivered by the supply voltage source. A second apparatus is coupled to the input terminals for generating from the supply voltage a further current which is superimposed on the low-frequency alternating current. The polarity of the further current is the same as that of the low-frequency alternating current. As a result, instabilities do not arise in the discharge arc of a high-pressure discharge lamp operated by the circuit.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: December 31, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Hendrikus M. W. Goossens
  • Patent number: 5581160
    Abstract: An electroluminescence (EL) element lighting device for an EL element, includes a first circuit for self-oscillating to generate a first signal having a first frequency, and for gradually charging up said EL element in response to the first signal, and a second circuit for self-oscillating to generate a second signal having a second frequency, and for discharging the charge stored in said EL element in response to the second signal. The first frequency of the first signal is greater than the second frequency of the second signal, and the second signal is active only during a time interval less than 50% of each period of the second signal.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: December 3, 1996
    Assignee: NEC Corporation
    Inventor: Yuji Fujita
  • Patent number: 5471114
    Abstract: A fail safe power supply system specially adapted for supplying power to devices such as lights. A battery is provided to supply power to the devices, and during normal operation, charge on the battery is maintained within selected levels by a charging control system that is connected to a source of commercial power. During a commercial power outage, the battery continues to supply normal power to the devices for a prolonged period of time, usually until commercial power is restored, thus obviating the necessity for a separate backup power source.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: November 28, 1995
    Assignee: DMI Holdings, Inc.
    Inventors: M. Larry Edwards, W. Joe Watson
  • Patent number: 5418433
    Abstract: A flashlight has a hybrid battery pack consisting of a primary-cell battery (ex: an Alkaline battery) and an auxiliary rechargeable battery of low internal resistance (ex: a Ni--Cad battery). Connected in circuit between the batteries and the flashlight's light bulb is a slide switch and an electronic control circuit. The slide switch has an OFF-position, an ON-position, and a spring-loaded variable BOOST-position. In full BOOST, the electronic control circuit operates such as to apply a voltage of about 1.5 times normal magnitude to the light bulb; thereby increasing the flashlight's light output by a factor of about 4.0 above normal. However, at that degree of BOOST, if indeed maintained on a continuous basis, the life of the light bulb will be shortened to about 15 minutes versus about 50 hours when used in the normal ON-position.
    Type: Grant
    Filed: November 28, 1989
    Date of Patent: May 23, 1995
    Inventor: Ole K. Nilssen
  • Patent number: 5367225
    Abstract: A high frequency power supply for neon and mercury luminous tubes including means for simultaneously suppressing bubbles formed in neon tubes and for minimizing migration of mercury commonly associated with the use of solid-state luminous tube power supplies.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: November 22, 1994
    Assignee: Everbrite, Inc.
    Inventors: David Pacholok, David Doss, deceased
  • Patent number: 5349269
    Abstract: A power supply for an electroluminescent lamp includes a pair of inverters for alternately powering the EL lamp from a low voltage DC source. A first inverter is connected to a first electrode of the EL lamp and a transistor is connected between the first electrode and electrical ground. A second inverter is connected to a second electrode of the EL lamp and a second transistor is connected between the second electrode and electrical ground. A pulse generator connected to the inverters and the transistors operates the inverters and transistors to power the EL lamp alternately from one inverter and then the other. In one embodiment of the invention, the voltage across the EL lamp is referenced to ground and, in another embodiment, the voltage across the EL lamp is referenced to the voltage of the DC source.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: September 20, 1994
    Assignee: Durel Corporation
    Inventor: Robert A. Kimball
  • Patent number: 5332950
    Abstract: A driver circuit for a display device, in which first and second clock pulse generator circuits generate first and second clock pulses to a gate circuit for allowing the first clock pulse to pass when the first and second clock pulses are a high level, and by the output of the gate circuit, a combination of a transistor and an inductance generate a high voltage pulse. The high voltage pulse is rectified in a triple voltage rectifying circuit to output a high voltage output for driving the display device such as EL elements, and the high voltage output can be reset by a low frequency pulse output from a discharge circuit. As a result, no inverter is required, and a small-sized and light-weighted driver circuit is achieved with a long luminescence life of the EL elements and without noises offensive to the ear.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: July 26, 1994
    Assignee: NEC Corporation
    Inventors: Motoyoshi Komoda, Minoru Katsumata
  • Patent number: 5325021
    Abstract: A high voltage accelerating potential, which is supplied by a high voltage direct current power supply, is applied to the electrically conducting interior wall of an RF powered glow discharge cell. The RF power supply desirably is electrically grounded, and the conductor carrying the RF power to the sample held by the probe is desirably shielded completely excepting only the conductor's terminal point of contact with the sample. The high voltage DC accelerating potential is not supplied to the sample. A high voltage capacitance is electrically connected in series between the sample on the one hand and the RF power supply and an impedance matching network on the other hand. The high voltage capacitance isolates the high DC voltage from the RF electronics, while the RF potential is passed across the high voltage capacitance to the plasma. An inductor protects at least the RF power supply, and desirably the impedance matching network as well, from a short that might occur across the high voltage capacitance.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: June 28, 1994
    Assignee: Clemson University
    Inventors: Douglas C. Duckworth, R. Kenneth Marcus, David L. Donohue, Trousdale A. Lewis
  • Patent number: 5270618
    Abstract: A magnetic-electronic fluorescent lamp ballast is so arranged that the fluorescent lamp is powered simultaneously by two different currents; which two currents are supplied to the lamp by two separate parallel-connected current sources. One current is of 60 Hz frequency and is supplied directly from an ordinary 120 Volt/60 Hz power line by way of an ordinary magnetic reactor. The other current is of 30 kHz frequency and is derived from the power line by way of a frequency converter and is then supplied to the fluorescent lamp by way of a 30 kHz resonant circuit and a high-pass filter. The frequency converter is powered from the power line by way of a capacitive reactor, with the net result being that the power factor of the total power drawn from the power line is very high. The overall ballast is simple and provides for a relatively high efficacy.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: December 14, 1993
    Inventor: Ole K. Nilssen
  • Patent number: 5231333
    Abstract: The present invention describes a method and apparatus for a high frequency switching gas discharge tube supply which suppresses or eliminates the "bubble effect" in gas discharge tubes containing neon or argon-mercury gas or other gases and which eliminates the migration of mercury or other migratory gases toward one electrode over time. To prevent mercury migration to one electrode over time within an argon-mercury gas discharge tube, a line frequency bias voltage is induced on the high frequency, high excitation voltage resulting in a gas discharge tube display which is uniform in intensity of light over the length of the tube.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: July 27, 1993
    Assignee: Neon Dynamics, Inc.
    Inventor: Edward D. Orenstein
  • Patent number: 5214353
    Abstract: Connected in circuit between a regular two-cell battery and the light bulb in an otherwise ordinary flashlight is an auxiliary voltage source, such as a third battery cell of relatively small size. The bulb is normally powered directly from the regular two-cell battery. However, if a boost in light output is desired for a brief period of time, the auxiliary voltage source is connected in series with the two-cell battery. Switching is accomplished by way of a slide switch that has an OFF-position, an ON-position, and a spring-loaded BOOST-position. In the BOOST-position, the auxiliary voltage source is coupled in series with the two-cell battery, thereby boosting the RMS magnitude of the voltage applied to the light bulb by a factor of as much as 1.5; which, in turn, boosts the light output by a factor of about 4.0. To prevent substantial shortening of the overall life of the light bulb, since the life of the light bulb would be shortened by a substantial factor if being supplied with 1.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: May 25, 1993
    Inventor: Ole K. Nilssen
  • Patent number: 5191261
    Abstract: A flash lamp power supply system, comprising (a) a simmer power supply circuit, comprising (i) a DC simmer power supply, (ii) means for connecting a flash lamp in series with the DC power supply, and (iii) a capacitor connected in parallel to the power supply and to the flash lamp connecting means, wherein the impedance and capacitance of the simmer power supply are selected so as to provide dV/dT for the simmer power supply circuit equal to or greater than the rate at which the lamp impedance changes during a flash cycle; and (b) a pulse power supply circuit, comprising (i) a DC pulse source voltage supply, (ii) a thyristor, and (iii) means for connecting the lamp in series with the DC pulse source voltage supply and the thyristor, wherein the pulse power supply circuit further comprises a capacitor connected in parallel with the pulse source voltage supply.
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: March 2, 1993
    Assignee: Purus, Inc.
    Inventor: Barton Mass