Discharge Device And/or Rectifier In Shunt To The Load Device Patents (Class 315/207)
  • Patent number: 9258863
    Abstract: Aspects of the disclosure provide a circuit. The circuit includes a control circuit and a return path circuit. The control circuit is configured to operate in response to a first conduction angle of a dimmer coupled to the circuit. The first conduction angle is adjusted to control an output power to a first device. The dimmer has a second conduction angle that is independent of the control of the output power to the first device. The return path circuit is configured to provide a return path to enable providing power to a second device in response to the second conduction angle.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: February 9, 2016
    Assignee: Marvell World Trade Ltd.
    Inventors: Ravishanker Krishnamoorthy, Siew Yong Chui, Jun Li
  • Patent number: 9041306
    Abstract: An illumination device (1) comprises: input terminals (2) for coupling to AC mains; a LED string (10) connected in series with the input terminals; a rectifier (30), having input terminals connected in series with the LED string; a controllable voltage source (40), having input terminals coupled to the rectifier output terminals; a series arrangement of at least one auxiliary LED (51) and a second ballast resistor (52) connected to the output terminals of the controllable voltage source. The voltage source comprises: a series arrangement of an adjustable first resistor (46) and a second resistor (47) connected in parallel to the input terminals; a tuneable Zener diode (49) connected in parallel to the output terminals, having a control input terminal (48) connected to the node between the two resistors; wherein positive output terminal is connected to positive input terminal and negative output terminal is connected to negative input terminal.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: May 26, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Georg Sauerlaender
  • Patent number: 8896207
    Abstract: The present invention is directed to a fluorescent light fixture assembly including a ballast and a novel lighting element that includes an array of LEDs and at least one converter module that enables the existing ballast providing an AC power input to supply DC power to the LED array. The lighting element includes a body that contains the LED array and the converter modules and shares the configuration of the lighting element that is to be retrofitted. The lighting element receives power from the pre-existing ballast, wherein the converter module provides a constant current source to power the LED array. Thus, the lighting element, including the converter module, replaces the conventional fluorescent light tube in a cost-effective retrofit manner with the existing ballast.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: November 25, 2014
    Assignee: ElectraLED Inc.
    Inventors: James Thomas, Gary Gatesman, James Mosier
  • Patent number: 8853958
    Abstract: A driving circuit for a solid state lighting apparatus includes a full wave rectifier configured to rectify an alternating current (AC) input voltage signal to generate a rectified input signal, a boost conversion circuit configured to receive the rectified input signal and responsively generate a direct current (DC) output voltage signal and to supply the output voltage signal to a solid state light source, and a boost control circuit coupled to the boost conversion circuit and configured to cause the boost conversion circuit to operate in a constant power mode.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: October 7, 2014
    Assignee: Cree, Inc.
    Inventors: Praneet Athalye, Qingcong Hu, Michael Walters, Eric Menzel, Michael James Harris
  • Patent number: 8760065
    Abstract: A passive anti-arcing protection components for electronic ballasts of fluorescent lamps. This protection component is a bridge-rectifier-resistor-capacitor network, containing at least a diode, a resistor, and a capacitor. The component's circuitry is electrically connected to the ballast at the lamp side, acting as a low-resistance redirection path for any sudden change in energy. When an arcing condition is about to occur, this protection circuitry absorbs the spark energy, ceasing the arcing condition.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: June 24, 2014
    Assignee: Century Concept Limited
    Inventors: Cho Sing Chan, Ming Tai Ho
  • Patent number: 8760069
    Abstract: A method for operating a high pressure discharge lamp, with the high pressure discharge lamp being operated by a current inverter with a square wave lamp current having a positive phase with positive current flow and a negative phase with negative current flow, and with the current inverter being controlled by a control arrangement wherein the method comprises the steps of measuring a value for the positive current flow representing the lamp wattage or the square wave lamp current, measuring a value for the negative current flow representing the lamp wattage or the square wave lamp current; calculating a predetermined setpoint value in each case from a guide variable of a lamp wattage or of the square wave lamp current and the measured value for the phase with positive current flow; calculating a predetermined setpoint value in each case from a guide variable of a lamp wattage or of the square wave lamp current and the measured value for the phase with negative current flow; and outputting the two predetermin
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: June 24, 2014
    Assignee: OSRAM Gesellschaft Mit Beschrankter Haftung
    Inventors: Alois Braun, Walter Limmer, Maximilian Schmidl
  • Patent number: 8749170
    Abstract: In various embodiments, a device for controlling power supply towards at least one light source comprising a load having a value variable as a result of switching of at least one switch coupled thereto, is provided. The device may include: a power supply set controllable to determine the intensity of the current fed towards said load; a current feedback loop sensitive to the intensity of the current fed towards said load, said current feedback loop connected to said power supply set to maintain the intensity of the current fed towards said load upon variation of said load; and a voltage control sensitive to the voltage across said load, said voltage control likewise connected to said power supply set to maintain the intensity of the current fed towards said load upon variation of said load.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: June 10, 2014
    Assignee: OSRAM Gesellschaft mit beschraenkter Haftung
    Inventors: Federico Carraro, Paolo De Anna, Diego Fighera
  • Patent number: 8664871
    Abstract: A power supply for use in a UV curing lamp assembly is disclosed. The power supply is powered by two intermediate frequency (200-400 Hz) low voltage sinusoidal power sources that drive the primary windings of a dual laminated transformer. The low voltage sinusoidal power sources are configured to have different phases. The out-of-phase low voltage sine wave sources are converted to high voltage sine waves on the secondary windings of the dual laminated transformer having the same phase difference relationship. A single rectifier comprising six high voltage diodes, called a ladder rectifier, combine the two out-of-phase sine waves into a single, approximately DC output power source. By modulating a phase difference between two input sine wave power sources, the approximate DC output voltage exiting the ladder rectifier may be alternated between a low ripple mode of about a 13.84% ripple, a high current mode, a high voltage mode, and an intermediate mode with a ripple in the range of about 13.84% to about 100%.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: March 4, 2014
    Assignee: Heraeus Noblelight Fusion UV Inc.
    Inventor: Yixin Yang
  • Publication number: 20140049176
    Abstract: An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal.
    Type: Application
    Filed: August 17, 2012
    Publication date: February 20, 2014
    Inventors: W. J. "Jim" Weaver, JR., Michael H. Freeman, Mitchael C. Freeman, Robert Dieter, Brian Santee
  • Patent number: 8653744
    Abstract: A driving circuit for a LCD backlight source comprising a BOOST structure which comprises a capacitor C12, a capacitor C13, an inductor L2, a diode D2, and a MOSFET, wherein the driving circuit further comprises a capacitor C11, a capacitor C14, a diode D3, and a diode D4. One terminal of the diode D3 is connected to one terminal of the capacitor C13, and the other terminal is connected to one terminal of the diode D4; the other terminal of the diode D4 is connected to one terminal of the capacitor C14 which is the output terminal of the circuit, and the other terminal of the capacitor C14 is grounded; one terminal of the capacitor C11 is connected between the inductor L2 and the diode D2, and the other terminal of the capacitor C11 is connected between the diode D3 and the diode D4.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: February 18, 2014
    Assignees: Boe Technology Group Co., Ltd., Beijing Boe Display Technology Co., Ltd.
    Inventors: Liang Zhang, Dan Wang, Weihai Li, Shuai Hou, Xingji Wu
  • Patent number: 8598797
    Abstract: A driver device for driving an LED lighting device includes at least one power switch adapted to operate at a switching frequency of greater than 500 KHz and adapted to control the driving current provided to the LED lighting device. Operating the power switch at such a high frequency allows a substantial reduction in passive devices such as inductors and capacitors.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: December 3, 2013
    Assignee: Luxera, Inc.
    Inventors: Dmitri A. Choutov, Leonard S. Livschitz
  • Patent number: 8573782
    Abstract: A discharge lamp drive device for driving a discharge lamp including a first electrode and a second electrode, include: a power supply unit which supplies alternating power to the discharge lamp by inputting alternating current between the first electrode and the second electrode, wherein the power supply unit includes a power reduction control unit which reduces the alternating power from a first level to a second level lower than the first level, and a duty ratio control unit which steppedly varies duty ratio of the alternating current in a predetermined period at the time of reduction of the alternating power.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: November 5, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Shigeyasu Soma, Tetsuo Terashima
  • Patent number: 8525427
    Abstract: The invention relates to electric lighting facilities powered from an external electrical network. The light-emitting diode lamp comprises a step-down voltage converter (1) made up of a chain of capacitors (2, 3, 4) connected in series, one of which is a power take-off capacitor (3) and is connected to at least one pair (5) of inverse-parallel connected light-emitting diodes (6, 7). The invention makes it possible to achieve extremely low electrical energy consumption for lighting, ensure optimum performance, and use the circuit for the additional function of supplying power to external users of, for example, mobile telephones.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: September 3, 2013
    Inventors: Iurii N. Samoilenko, Valeriy S. Galuschak
  • Patent number: 8450950
    Abstract: An enhanced control mechanism for an LED light string system is provided for switching between one of two DC output phases or polarities so as to actuate one or the other of two LEDs within the bulbs on the light string. The control mechanism is further configured to allow switching so as to pass through the input power provided by a light string that is plugged into its electrical power feeding end. The control mechanism may provide either AC, rectified AC, or DC voltage of various values to the LED string according to the particular needs of the LED bulbs.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: May 28, 2013
    Assignee: National Christmas Products, Inc.
    Inventor: Michael M. McRae
  • Patent number: 8450934
    Abstract: A circuit arrangement for operating a low-pressure discharge lamp may include a voltage source with two terminals; switches; and a series resonant circuit; a controller configured to control the switches such that an AC voltage is applied to the resonant circuit; a PTC thermistor coupled on one side to a circuit point of the resonant circuit and on the other side, at least one of via a diode, to the first terminal of the voltage source and, via a diode to the second terminal of the voltage source; a resistive element connected in series with a diode in the circuit between a terminal of the voltage source and the PTC thermistor; and an evaluation device configured to tap off the voltage drop across the resistive element and being coupled to the controller in order to deactivate the controller.
    Type: Grant
    Filed: May 31, 2010
    Date of Patent: May 28, 2013
    Assignee: OSRAM Gesellschaft mit beschraenkter Haftung
    Inventor: Harald Schmitt
  • Patent number: 8450935
    Abstract: A series connected light string using LEDs connected to an AC power source is disclosed. In order to make some or all of the lights color change, twinkle, and/or flash, controllers are provided in series with all or some of the LEDs. Because the supply source AC, but the active elements are essentially rectifiers, the circuit becomes a half wave DC circuit. Half wave DC will cause unpredictable behavior in DC circuit components. This will cause the controller to shut down during the zero voltage portion of the pulsating DC cycle. To prevent this a current supplying element is placed in parallel with the controller.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: May 28, 2013
    Assignee: Seasonal Specialties, LLC
    Inventor: Robert C. Neuman
  • Publication number: 20130026937
    Abstract: A light emitting element lighting device includes: a rectifying unit which rectifies an AC voltage; a smoothing unit which smoothes a ripple voltage from the rectifying unit; a power supply unit having a switching element; and a control unit which controls on/off of the switching element. Further, the smoothing unit servers as a partial smoothing circuit for partially smoothing a low voltage period of the ripple voltage outputted from the rectifying unit. The power supply unit supplies a lighting power to a light source unit including one or more light emitting elements. The control unit controls a switching frequency of the switching element to decrease as the output voltage of the smoothing unit decreases.
    Type: Application
    Filed: July 25, 2012
    Publication date: January 31, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Akira NAKAJO, Hiroshi KIDO, Shigeru IDO
  • Publication number: 20120313537
    Abstract: An LED power supply device may include a power supply to control an LED component, a control unit to control the power supply, the control unit having a control interface for applying external control signals to the power supply, and a voltage supply unit connected to a connection of the power supply, wherein the control unit receives operating voltage from the voltage supply unit for continuous operation in an activated and non-activated control state of the LED component, wherein the voltage supply unit comprises a capacitor coupled to an output side of the power supply, the capacitor configured to supply a capacitor voltage as operating voltage to the LED power supply device, and wherein the control unit is configured to charge the capacitor using pulse-like control of the power supply such that, in the non-activated control state, a maximum charging voltage lies below the LED threshold voltage.
    Type: Application
    Filed: June 8, 2012
    Publication date: December 13, 2012
    Applicant: EXSCITRON GMBH
    Inventors: Stephan Gruber, Rene Franzky, Winfried Beyer, Gerd Meyhofer
  • Publication number: 20120306397
    Abstract: A light-emitting module may be configured to have improved light emission efficiency and light distribution characteristics. A light-emitting module may include a substrate having a front surface side as a component mounting surface and a rear surface side as a flat heat dissipating surface, a plurality of light-emitting elements arranged in a manner protruding at a central portion of the component mounting surface of the substrate. The light-emitting elements may radiate light at least in an upper surface direction and in a direction along the component mounting surface. The module may further include one or more lighting circuit components electrically connected to the light emitting elements by a wiring pattern arranged on the substrate and which is arranged closer to the peripheral edge side of the substrate than the light emitting elements on the component mounting surface of the substrate, and a connector for power supply connection.
    Type: Application
    Filed: August 16, 2012
    Publication date: December 6, 2012
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
    Inventors: Toshiya Tanaka, Akiko Saito, Hitoshi Kawano
  • Patent number: 8314565
    Abstract: A solid-state light engine comprised of light emitting diodes (LEDs) configured into a bridge rectifier with a current limiting module coupled to the LED bridge rectifier. The light engine may be packaged for high temperature operation. Optionally, the LEDs comprise wavelength-converting phosphors with a persistence that is a multiple of the peak to peak current period, to smooth and mask ripple frequency pulsation of emitted light.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: November 20, 2012
    Assignee: Lighting Science Group Corporation
    Inventors: Robert J. Burdalski, Joseph B. Mazzochette
  • Patent number: 8279162
    Abstract: The invention relates to a discharge lamp with a floor plate and a roof plate designed for dielectrically impeded discharge, in which the minimum discharge distances are at least 10 mm.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: October 2, 2012
    Assignee: Osram AG
    Inventors: Lothar Hitzschke, Frank Vollkommer
  • Patent number: 8267554
    Abstract: A light emitting diode (LED) device comprises a base and a cover packaging of a rectifier diode chip and a light emitting diode chip connecting in series with a metal wire. The LED device can be plugged directly into the socket of the LED light string without any other external rectifier circuits. Moreover, the device has advantages of small size, easy-to-use and easy-to-change. By adopting different connection methods with the LED device, it can achieve anticipative functions, such as half-wave, full-wave and bridge rectifier, etc.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: September 18, 2012
    Assignee: Qinghaun Sun
    Inventor: Tianming Liu
  • Patent number: 8258710
    Abstract: Solid state light source driving and dimming systems are provided that enable a plurality of solid state light source (e.g., LED) driver circuits to be coupled to a single AC voltage source. The driver circuits may include constant current circuitry configured to generate a constant AC current from the AC voltage source, and rectifier circuitry configured to generate a DC current to drive the solid state light source (e.g., LEDs). Dimming control includes shunt circuitry operable with a PWM switch to shunt the AC voltage source during certain portions of a PWM signal and to decouple the shunt circuitry from the AC voltage source during other portions of the PWM signal. Shunting the AC voltage source causes the interruption of the DC current to effectively turn off the LEDs. Decoupling the shunt circuitry may improve overall efficiency of power transfer to the LEDs.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: September 4, 2012
    Assignee: Osram Sylvania Inc.
    Inventors: Benjamin Alexandrovich, David Betts
  • Publication number: 20120161657
    Abstract: A passive anti-arcing protection components for electronic ballasts of fluorescent lamps. This protection component is a bridge-rectifier-resistor-capacitor network, containing at least a diode, a resistor, and a capacitor. The component's circuitry is electrically connected to the ballast at the lamp side, acting as a low-resistance redirection path for any sudden change in energy. When an arcing condition is about to occur, this protection circuitry absorbs the spark energy, ceasing the arcing condition.
    Type: Application
    Filed: July 18, 2011
    Publication date: June 28, 2012
    Inventors: Cho Sing CHAN, Ming Tai HO
  • Publication number: 20120001554
    Abstract: Embodiments of the invention provide for a linear lighting system with a plurality of discrete light sources. Other embodiments of the invention include heat dissipation techniques and apparatus for a linear light system. Other embodiments of the invention include a two component lighting system that includes rails and nodes. In some embodiments, the lighting and control aspects can be divided between the rail and node. In yet other embodiments a linear lens providing a unique photometric distribution is provided.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 5, 2012
    Inventors: Kevin Franklin Leadford, Carl Gould, Peter K. Nelson
  • Publication number: 20110285302
    Abstract: A driver device for driving an LED lighting device includes at least one power switch adapted to operate at a switching frequency of greater than 500 KHz and adapted to control the driving current provided to the LED lighting device. Operating the power switch at such a high frequency allows a substantial reduction in passive devices such as inductors and capacitors.
    Type: Application
    Filed: May 17, 2011
    Publication date: November 24, 2011
    Inventors: Dmitri A. Choutov, Leonard S. Livschitz
  • Patent number: 8004212
    Abstract: A VFD drive apparatus in which the filament of a VFD is coupled at a first terminal to an input voltage derived from a voltage source, and at a second terminal to a shunt voltage regulator that establishes a regulated filament current and a regulated cutoff voltage with respect to ground potential. Other electrical loads such as drive circuitry for the anodes and grid of the display are coupled between the second terminal of the filament and ground potential so that at least a portion of the filament current is supplied to such other electrical loads. Power dissipated by the shunt voltage regulator is thereby reduced, and the cost associated with providing additional voltage regulators for the other electrical loads is avoided.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: August 23, 2011
    Assignee: Delphi Technologies, Inc.
    Inventors: Wayne A. Madsen, Andrew R. Betts
  • Patent number: 7688006
    Abstract: A fluorescent lamp adapted for effecting stepless dimming with a regular SCR dimmer, comprising a filter and rectifier circuit (1), a DC high voltage stabilizing circuit (2), a voltage signal detection and frequency control circuit (6), a lamp load (4), a lamp current feedback circuit (5) and a voltage signal sampling circuit (3) thereby changing the power factor and luminous intensity of the lamp in accordance with the variation of the conduction phase angle of the silicon controlled rectifier dimmer. The present invention solves the discontinuity and instability issues in course of dimming operation and is particularly adapted for use in an integrated compact fluorescent lamp.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: March 30, 2010
    Assignee: Mass Technology (H.K.) Ltd.
    Inventor: Onn Fah Foo
  • Patent number: 7667412
    Abstract: A driving device for driving a light source module (12), includes an inverter circuit (15) for converting a received signal to a signal driving the light source module, a feedback and filter circuit (13) for feeding back currents flowing through the light sources and filtering radio frequency interference (RFI) signals of feedback currents, and a controller (14) electrically connected between the feedback and filter circuit and the inverter circuit. The feedback and filter circuit includes at least one filter for filtering the RFI signals of the feedback currents, and a resistor (R) for feeding back the current flowing through the light source module. The filter includes an impedance (Z11) including a first terminal designated as an input of the filter and a second terminal, and a capacitor (C11). The capacitor includes a third terminal designated as an output of the filter and a fourth terminal electrically connected to ground.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: February 23, 2010
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventors: Tsung-Liang Hung, Chi-Hsiung Lee
  • Patent number: 7613020
    Abstract: A discharge lamp ballast apparatus includes a DC/DC converter having a transformer T1 and a DC/DC converter having a transformer T2, which are connected in parallel; a control section 4 for controlling the output voltages of the DC/DC converters by varying their duties with shifting the operation phases of the transformers T1 and T2 of the DC/DC converters; and a voltage-multiplier rectifier circuit having diodes 7-9 and capacitors 10-12 for generating a high voltage used for starting a discharge lamp 22 by utilizing the potential difference between the output voltages of the transformers T1 and T2.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: November 3, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasuhiro Nukisato, Takashi Ohsawa
  • Patent number: 7545102
    Abstract: A single-stage electronic ballast device outputs a square wave current to drive an HID lamp, which includes a rectifying and power factor correction unit, a bridge converter and a controller circuit. The rectifying and power factor correction unit has an input connected to an AC power source to rectify an AC power to a DC power. The bridge converter comprises two bridge arms formed by four switches, load terminals defined by midpoints of the two bridge arms and the HID lamp is connected between the load terminals. The bridge converter converts DC current to square wave current to drive the HID lamp with power control. The load terminals are selectively connected to output of the rectifying and power factor correction unit to adjust waveform of input current for higher power factor. The controller circuit has output connected to DC link voltage terminal and load terminal of the bridge converter.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: June 9, 2009
    Assignee: Industrial Technology Research Institute
    Inventors: Ching-Ran Lee, Hwei-Shung Chung
  • Patent number: 7518316
    Abstract: Disclosed is a low cost LED string circuit design that uses an inexpensive half-wave rectification and low-pass filter circuit that is designed to produce minimal flicker in the LED string that is connected to the circuit. The components of the half-wave rectification and low-pass filter circuit are selected in accordance with design principles that prevent glittering and flickering of the LED string. The circuit components of the half-wave rectification and low-pass filter circuit can be embedded in an outlet plug or as a separate independent unit between an AC power plug and the LED string.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: April 14, 2009
    Assignee: 1 Energy Solutions, Inc.
    Inventor: Jing Jing Yu
  • Publication number: 20080278084
    Abstract: The present invention relates to a LED lamp set apparatus, comprises a gas discharge tube and a LED connected in series, the gas discharge tube is a neon tube, an argon tube, a helium tube or a krypton tube, or a gas tube in which the other inert gases is filled or is filled with a mixture of inert gases. When operating the LED lamp set apparatus provided by the present invention, a public AC power source can be directly input to the LED lamp set apparatus for lighting the LED, needless of an inverter; for protecting the LED, the LED lamp set apparatus can be connected in series with a current-limiting resistance, or the public AC power source can be input to a rectifying diode or a bridge rectifier for processing a rectifying operation and then input to the LED lamp set apparatus; a plurality of the LED lamp set apparatuses can be connected in parallel; or the LED lamp set apparatus can be integratedly-packaged and is inserted to a connector.
    Type: Application
    Filed: April 29, 2008
    Publication date: November 13, 2008
    Inventor: Yuan-Fong CHUNG
  • Publication number: 20080211417
    Abstract: A fluorescent lamp adapted for effecting stepless dimming with a regular SCR dimmer, comprising a filter and rectifier circuit (1), a DC high voltage stabilizing circuit (2), a voltage signal detection and frequency control circuit (6), a lamp load (4), a lamp current feedback circuit (5) and a voltage signal sampling circuit (3) thereby changing the power factor and luminous intensity of the lamp in accordance with the variation of the conduction phase angle of the silicon controlled rectifier dimmer. The present invention solves the discontinuity and instability issues in course of dimming operation and is particularly adapted for use in an integrated compact fluorescent lamp.
    Type: Application
    Filed: February 29, 2008
    Publication date: September 4, 2008
    Inventor: Onn Fah Foo
  • Patent number: 7407617
    Abstract: A method of polymerizing by a free radical polymerization mechanism, product formed thereby, and apparatus for performing this method, are disclosed. The composition to be polymerized by the free radical polymerization mechanism is irradiated by a substantially constant radiation, the radiation being substantially without pulsation. The use of the substantially constant radiation without pulsation reduces premature termination of the polymerization. The substantially constant radiation can be the output of a lamp powered by a constant current, direct current power supply.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: August 5, 2008
    Assignee: Fusion UV Systems, Inc.
    Inventors: Jeffrey K. Okamitsu, A. David P. Harbourne, Sonny Jõnsson, Rong Bao
  • Patent number: 7283131
    Abstract: An image display apparatus having a plurality of image forming devices. In an output circuit provided between constant voltage supplies and wiring for driving each of the image forming devices, MOSFETs are successively turned on from the one having a higher ON resistance at the time of switching to make a stepwise transition between outputs from the constant voltage supplies, and have steady potential, thereby limiting undesirable variation in signal potential at the time of switching.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: October 16, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiko Murayama, Tadashi Aoki, Aoji Isono, Kenji Shino
  • Patent number: 7276858
    Abstract: An improved decorative light string circuit comprises full bridge rectification located in or downstream of the front plug, wherein the rectification circuit contains one or more voltage reducing and/or filtering elements in order to reduce or limit LED drive current and reduce (filter) DC ripple and 1 or 2 LED series sets. Additional rectification circuits and LED series sets can be added in parallel to the first in “stacked mode”, with each rectification circuit and LED series set electrically independent of prior and subsequent circuits. This eliminates the rectifying diode current summation load restrictions imposed by prior art and associated safety hazard due to diode overheating.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: October 2, 2007
    Assignee: Fiber Optic Designs, Inc.
    Inventor: David Allen
  • Patent number: 7224151
    Abstract: A fixed phase power controller that converts a line voltage to an RMS load voltage includes an analog control block with a capacitor that receives an input that is independent of a change in magnitude of the line voltage and that charges and discharges to provide a trigger signal at a first frequency, a reset circuit that periodically resets an initial condition of the analog control block, a synchronization connection that provides a sync signal that synchronizes the trigger signal with a waveform of the line voltage, and a control circuit that clips a load voltage based on the synchronized trigger signal to define the RMS load voltage. The controller finds application in a lamp where it reduces the line voltage to an RMS load voltage suitable for a light emitting element.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: May 29, 2007
    Assignee: Osram Sylvania Inc.
    Inventors: Matthew B. Ballenger, Ernest C. Weyhrauch
  • Patent number: 7081709
    Abstract: A reliable and efficient circuit for lighting a discharge lamp is described. An inverter accepts a direct current supply voltage and outputs an alternating current lamp voltage to drive the discharge lamp at a relatively high frequency. In one embodiment, the inverter includes semiconductor switches in a full-bridge configuration, a transformer feedback circuit to control the semiconductor switches, and a series L-C resonant circuit. In one embodiment, the inverter includes semiconductor switches in a half-bridge configuration, a transformer feedback circuit to control the semiconductor switches, and a series L-C resonant circuit. The inverter can drive multiple discharge lamps in a parallel configuration. A bypass circuit can also be coupled across a cathode of the discharge lamp to extend the life of the discharge lamp. The bypass circuit activates when a lamp cathode wears out.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: July 25, 2006
    Assignee: AMPR, LLC
    Inventor: Veniamin A Pak
  • Patent number: 6949889
    Abstract: A current-regulating driver circuit for a light emitting diode (LED) maintains energization drive to and thereby illumination provided by the LED at a prescribed, substantially constant value, over a relatively wide range of input (AC or DC) voltage. First and second input nodes are coupled to a source of AC or DC voltage and to a load, powered by the source of AC or DC voltage. An input rectifying diode is coupled to the first input node. A controlled current flow element is coupled in a first current flow path between the input rectifying diode and the LED and is controllably operative to supply current for illuminating the LED.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: September 27, 2005
    Assignee: Adtran, Inc.
    Inventor: Jeffrey John Bertrand
  • Patent number: 6831421
    Abstract: An ionizing discharge device operating arrangement wherein initiation of discharges in for example a dielectric barrier discharge device is accomplished by a short circuit shunting of the charged electrodes of the device. A cycle of slow charging of the device inter-electrode capacitance followed by a high-speed electrode-shunting event is used for continuing operation of the device. In this operating cycle energy storage is accomplished by the inter-electrode capacitance of the device without causing ionization by way of a controlled rate of capacitance charging accomplished without assistance of additional storage elements. Desirable fast pulse rise-time energization characteristics are achieved in the dielectric barrier discharge device by way of using a fast, preferably electronic, switch in the shunting operation and maintaining the discharge in a circuit of relatively low inductance and minimal lead lengths.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: December 14, 2004
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Peter Bletzinger
  • Patent number: 6808287
    Abstract: Improved method and apparatus for hand-held portable illumination. A flashlight and corresponding method are described. The flashlight includes a housing, a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the flashlight is suitable for handheld portable operation by a user. In one embodiment, the first electrical circuit further includes a control circuit for maintaining a predetermined light output level of the LED units as a charge on a battery varies. In another embodiment, the control circuit maintains an average predetermined light output level of the LED units as the charge on the battery cell varies by changing a pulse width or frequency as the charge on the battery cell varies to maintain a given average light output.
    Type: Grant
    Filed: November 18, 2002
    Date of Patent: October 26, 2004
    Assignee: PPT Vision, Inc.
    Inventors: Gary A. Lebens, Charles T. Bourn, Charles A. Lemaire
  • Patent number: 6788008
    Abstract: A device for operating a dielectric barrier discharge lamp in which not only the efficiency is maintained, but in which a reduction of the irradiance over the course of use is advantageously prevented. The device includes a dielectric barrier discharge lamp and a feed device for applying a high voltage to this dielectric barrier discharge lamp, wherein the feed device via a set-up transformer applies a high voltage with an essentially periodic waveform to the barrier discharge lamp. Moreover, the applied high voltage first produces a steep rising waveform and then ringing, wherein the ratio of the difference between a second extreme value point and a third extreme value point to the difference between a first extreme value point and the second extreme value point of the ringing is less than or equal to 30%. It is a further object of an embodiment of the present invention to reduce or eliminate the ringing.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: September 7, 2004
    Assignee: Ushiodenki Kabushiki Kaisha
    Inventors: Takahiro Hiraoka, Masashi Okamoto
  • Patent number: 6724152
    Abstract: A lighting control system provides variable arc current to one or more fluorescent gas discharge lamps and provides a heating voltage to the lamp electrodes. The system includes a start-up circuit which includes circuitry for providing a starting voltage to an output power conditioning circuit. The latter drives a switching unit to control the application of DC power to the fluorescent gas discharge lamps and to provide an operating voltage to an input power factor correction circuit. The input power factor correction circuit boosts the converted DC power and the operating voltage. The start-up circuit includes a plurality of voltage doubling rectifier circuits and a plurality of zener diodes which receive the operating voltage and are electrically connected to the input power factor correction circuit and the output power conditioning unit so as to provide a regulated bias voltage supply to the output power conditioning unit and to the input power factor correction circuit.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: April 20, 2004
    Inventor: Allan Albert Nostwick
  • Publication number: 20040012343
    Abstract: A lighting control system provides variable arc current to one or more fluorescent gas discharge lamps and provides a heating voltage to the lamp electrodes. The system includes a start-up circuit which includes circuitry for providing a starting voltage to an output power conditioning circuit. The latter drives a switching unit to control the application of DC power to the fluorescent gas discharge lamps and to provide an operating voltage to an input power factor correction circuit. The input power factor correction circuit boosts the converted DC power and the operating voltage. The start-up circuit includes a plurality of voltage doubling rectifier circuits and a plurality of zener diodes which receive the operating voltage and are electrically connected to the input power factor correction circuit and the output power conditioning unit so as to provide a regulated bias voltage supply to the output power conditioning unit and to the input power factor correction circuit.
    Type: Application
    Filed: July 19, 2002
    Publication date: January 22, 2004
    Inventor: Allan Albert Nostwick
  • Publication number: 20030132718
    Abstract: A filament cut-back circuit is disclosed. The filament cut-back circuit comprises an impedance circuit coupled in series between either an AC voltage source and a primary filament winding, or a secondary filament winding and a filament. In response to an alternating voltage from the AC voltage source when coupled in series thereto or an alternating voltage from the secondary filament winding when coupled in series thereto, the impedance circuit operates as a short circuit when the alternating voltage is at a preheat frequency and operates as an open circuit when the alternating voltage is at an operating frequency.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Ramakrishnan Venkatraman, Michael Y. Zhang
  • Patent number: 6534931
    Abstract: A dimming control system includes a first circuit (100) and a second circuit (200). First circuit (100) is coupled in series with the AC line source (10) and receives brighten and dim commands from a user. The brighten and dim commands are communicated to second circuit (200) by momentarily altering the AC voltage waveforms observed by second circuit (200). Second circuit (200) provides an adjustable dimming control voltage that is coupled to existing dimming control circuitry within an electronic dimming ballast. The dimming control voltage is adjusted by the second circuit (200) in dependence on the observed AC voltage waveforms.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: March 18, 2003
    Assignee: Osram Sylvania Inc.
    Inventors: John G. Konopka, Sameer Sodhi
  • Publication number: 20030011320
    Abstract: A light source device with a mercury lamp, in the case of formation of a bridging short circuit of the gap between the electrodes of the discharge lamp caused by mercury, to prevent the light source device from no longer being usable because the difference between a defective device and one with such a bridging short circuit cannot be ascertained, has a means for determining that a bridging short circuit has formed in the gap between the electrodes. Furthermore, various manners for eliminating the bridging short circuit are provided including those that make use of vibration, heat, dielectric discharge or Lorenz forces.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 16, 2003
    Applicant: Ushiodenki Kabushiki Kaisha
    Inventors: Masashi Okamoto, Tomohiro Yamamoto, Minoru Fukuda
  • Patent number: 6091207
    Abstract: A pump supporting inductor (L1) is added to a half-bridge oscillator circ for a low-pressure discharge lamp (E) having a capacitive pump path, which inductor improves the pumping action of the pump path and its frequency response. Furthermore, an additional capacitor (C1) is connected between the pump path and the power supply path connected thereto, which capacitor acts as a trapezoidal capacitor in conjunction with the pump path and further improves the frequency response of the pump path.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: July 18, 2000
    Assignee: Patent-Treuhand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventor: Klaus Fischer
  • Patent number: 6051938
    Abstract: A circuit arrangement for high-frequency operation of a discharge lamp comprises a low-frequency rectifier for generating a DC voltage (buffer voltage) across a first capacitor (C1) from a low-frequency supply voltage. A DC/AC converter generates a high-frequency AC voltage from the buffer voltage. A load branch is coupled to the DC/AC converter and is provided with coupling terminals for coupling the discharge lamp to the load branch. A high-frequency rectifier (HR) converts the high-frequency voltage generated by the DC/AC converter into a DC voltage and comprises a series arrangement of first and second diodes (D5, D6) which have the same orientation. A control circuit (CR) controls the power consumed by the discharge lamp to a level which is dependent on a control signal (Sg). The high-frequency rectifier further comprises a switching device and a further control circuit (CR1). The switching device shunts at least one of the diodes of a feedback unit.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: April 18, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Paulus P. B. Arts, Everaard M. J. Aendekerk