Transformer In The Supply Circuit Patents (Class 315/276)
  • Patent number: 10894503
    Abstract: An automated headlight system for vehicles replaces the high and low beam with a continuum of beam patterns, with further variable spatial distribution of intensities and color spectrum. The digital-headlight is comprised of a controller, sensors and multiple, individually-controllable light-sources modified by optical-control elements to form narrow-beams which are then combined to create the overall headlamp beam. Utilizing real-time sensor data regarding beings, objects and vehicles in the way-ahead, as well as optional information on the driver, vehicle and environment, the logical controller dynamically adapts the headlight system's illumination so as to provide vehicle operators with optimal visibility while preventing discomfort-glare from reaching the eyes oncoming traffic or pedestrians.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: January 19, 2021
    Inventor: Yechezkal Evan Spero
  • Patent number: 10816144
    Abstract: A light fixture having a bulb base connector limited to a DC supply with 10-30 volt DC power. The connector assembly utilizes threading, friction and/or detent connection for connecting a lightbulb assembly to the light fixture in vehicles. A dual threading system and a barrel connector are configured to connect the lightbulb to the light fixture and to supply power from the fixture to the light bulb. The system uses a unique bulb base and connector to adapt to preexisting fixtures.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: October 27, 2020
    Assignee: ITC Incorporated
    Inventors: Gary R. Ludwig, Qingqi Xu
  • Patent number: 10784774
    Abstract: An electronic device includes a power converter and a current detector that is disposed at at least one position out of a primary-side position and a secondary-side position for the power converter and detects a current flowing at the at least one position. A snubber circuit including a capacitor is directly connected in parallel to both ends of the current detector.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: September 22, 2020
    Inventor: Tomokazu Ikarashi
  • Patent number: 10299331
    Abstract: A LED retrofit driver circuit (3) is provided, comprising at least an input (6) for receiving an operating voltage from a power supply (2), an output (8) for connection to one or more LED units (5), a power converter (7) connected with said input (6) and said output (8) and configured to provide a lamp current (50) at said output (8) during operation in at least a first and a second operating state. To provide a versatile circuit (3), allowing operation with a variety of power supplies and under various load conditions, in said first operating state, the power converter (7) is adapted to switch between a high current generating mode (40), in which the power converter (7) is configured to draw current pulses from said power supply (2) to provide a first average input current (33a), and an OFF mode (42) in which no current is drawn from said power supply (2).
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: May 21, 2019
    Assignee: SIGNIFY HOLDING B.V.
    Inventors: Robertus Leonardus Tousain, Redouane Eddeane, Dennis Johannes Antonius Claessens, Philip Louis Zulma Vael, Jack Jiang
  • Patent number: 10075054
    Abstract: A power supply includes a DC to DC converter, a storage capacitor, a voltage detector, a bypass unit, and a voltage-multiplying unit. The DC to DC converter receives a capacitor voltage from the storage capacitor and generates an output voltage; the voltage detector is configured to detect an input voltage. The bypass unit electrically connected to the storage capacitor turns on when the input voltage is equal to or greater than the capacitor voltage and turns off when the input voltage is lower than the capacitor voltage. The voltage-multiplying unit electrically connected to the storage capacitor and the voltage detector includes a first winding and a second winding and performs a voltage-multiplying procedure by coupling the first winding to the second winding while the input voltage is lower than a threshold voltage to ensure that the DC to DC converter can generate the output voltage for a specific period.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: September 11, 2018
    Assignee: Chicony Power Technology Co., Ltd.
    Inventor: Hsien-Yi Tsai
  • Patent number: 10018899
    Abstract: A discharge lamp driver includes a discharge lamp driving unit configured to supply drive current to a discharge lamp and a control unit configured to control the discharge lamp driving unit. The drive current has a modulation drive period in which a first period in which AC current having a frequency higher than 1 kHz is supplied and a second period in which DC current is supplied are alternately repeated. In the modulation drive period, the control unit periodically changes length of a first DC period included in the second periods and in which DC current of a first polarity is supplied, and length of a second DC period included in the second periods and in which DC current of a second polarity is supplied, and increases one of the length of the first DC period and the length of the second DC period while decrease the other one.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: July 10, 2018
    Inventor: Masaru Kono
  • Patent number: 10020104
    Abstract: Provided is a magnetic sheet including a resin film and a thin sheet-shaped magnetic body adhered to the resin film by an adhesive layer sandwiched between the thin sheet-shaped magnetic body and the resin film. The thin sheet-shaped magnetic body is made from an Fe-based metal magnetic material, has a thickness of 15 ?m to 35 ?m, and has an AC relative magnetic permeability (?r) in the range of 220 to 770 at a frequency of 500 kHz.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: July 10, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Mitsuhiro Watanabe, Hirohiko Miki, Masaki Nakamura
  • Patent number: 9967951
    Abstract: The present disclosure is directed to an alternating current (AC) to AC converter circuit for independently adjusting a current and voltage to adjust a light output of a light operating on AC power. In one embodiment, the AC to AC converter circuit includes a microprocessor, a first switch coupled to the microprocessor, a power factor controller (PFC) module coupled to the first switch, wherein the first switch is controlled by the microprocessor in accordance with a desired power output, one or more boost switches coupled to the PFC module, wherein the one or more boost switches are controlled by the PFC module as a function of an operation of the first switch and one or more load switches coupled to the one or more boost switches, wherein the one or more load switches are controlled by the microprocessor in accordance with the desired power output.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: May 8, 2018
    Inventors: David L. Bueno, Cameron L. Harvey
  • Patent number: 9941670
    Abstract: A discharge device includes a power supply device supplying AC power for generating a discharge in a clearance to a discharge load having a high-voltage electrode and a grounding electrode arranged to face the high-voltage electrode with the clearance and connected to a ground GND and having a connection state detector detecting a connection state of an output path of AC power, and a controller controlling the power supply device by determining the existence of an abnormality in the connection state and deciding whether AC power can be supplied or not. In the case where a disconnection or a connection failure occurs in the output path of AC power to be supplied from the discharge device to the discharge load, apparatuses included in the discharge device are protected from damage as well as occurrence of a secondary disaster can be prevented and suppressed.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: April 10, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kimihiko Tanaya
  • Patent number: 9860944
    Abstract: The purpose of the present invention is to provide an LED driving circuit with which it is possible to easily manage the color temperature by adjusting light.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: January 2, 2018
    Inventors: Takashi Akiyama, Tatsuro Yamada, Satoshi Goto
  • Patent number: 9812946
    Abstract: A power converter and a method are disclosed. The power converter includes a plurality of converting modules and a plurality of switching circuits. Each of the converting modules includes a bypass element configured to be shorted when a fault occurs. The switching circuits are electrically coupled in series to each other and electrically coupled in parallel to the converting modules respectively. Any one of the switching circuits is configured to be shorted when the bypass element of the corresponding converting module is shorted.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: November 7, 2017
    Inventors: Peter Mantovanelli Barbosa, Chia-Hsun Wu, Chih-Chiang Chan
  • Patent number: 9767947
    Abstract: A coupled inductor includes a first end magnetic element, a second end magnetic element, N connecting magnetic elements, and N windings, where N is an integer greater than one. Each of the N connecting magnetic elements connects to both of the first and second end magnetic elements. Each of the N windings is wound around a respective one of the N connecting magnetic elements such that the N windings are wound in alternating opposing directions. Possible applications of the coupled inductor include, but are not limited to, switching power converter applications.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: September 19, 2017
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Patent number: 9667151
    Abstract: An integrated magnetic component includes a magnetic core and a plurality of windings. The magnetic core includes at least four magnetic columns. The windings include a primary winding, a first secondary winding, a second secondary winding, and an inductor winding. The primary winding, the first secondary winding and the second secondary winding are wound on one of the magnetic columns. The inductor winding is wound on another magnetic column, and the inductor winding is coupled to the connection where the first secondary winding and the second secondary winding couple to each other. By integrating a transformer and a filter inductor into the integrated magnetic component, the number of the magnetic components, the overall volume, and the weight may be reduced while the mechanical properties may be promoted and the loss of the component connections may be reduced.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: May 30, 2017
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Zeng-Yi Lu, Hai-Jun Yang, Jin-Fa Zhang
  • Patent number: 9506636
    Abstract: A display connector is provided and includes a plate body, a display assembly, and a power source. The plate body includes a panel fastener, and the display assembly is positioned on the plate body. The display assembly includes a light source, with the power source connecting to the light source through the plate body.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: November 29, 2016
    Assignee: Atomic Design Inc.
    Inventor: Thomas McPhillips
  • Patent number: 9420670
    Abstract: A power line communication system communicates dimming levels to a lighting circuit over AC power lines. A power line controller generates control signals which are inserted on the AC power signal to the lighting circuit. A first series resonant circuit is coupled across the AC lines to bypass high frequency components from the control signals. A power line receiver receives the AC power signal and extracts the control signal to generate dimming level signals corresponding with the desired dimming level. To extract the control signal out of the AC power signal, the power line receiver has a resonant circuit connected in parallel with the AC power line and tuned to transmit the ballast control signal and to filter out the AC power signal. A dimming level sensing circuit then senses the signal pattern on the control signal and generates a dimming level signal corresponding to the desired dimming level.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: August 16, 2016
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Wei Xiong, Travis L. Berry, John Cavacuiti, Rob Mahaffey
  • Patent number: 9408259
    Abstract: An apparatus and computer readable storage medium are disclosed for supplying power to a load such as a plurality of light emitting diodes. A representative apparatus comprises a primary module, a first secondary module couplable to a first load, and a second secondary module couplable to a second load. The primary module comprises a transformer having a transformer primary. The first secondary module comprises a first transformer secondary magnetically coupled to the transformer primary, and the second secondary module comprises a second transformer secondary magnetically coupled to the transformer primary, with the second secondary module couplable through the first or second load to the first secondary module.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: August 2, 2016
    Assignee: Chemtron Research LLC
    Inventor: Patrice R. Lethellier
  • Patent number: 9371974
    Abstract: A lighting device includes: a circuit board placed on a base; and a transformer provided in the circuit board. The transformer includes: a winding pattern formed on the circuit board; and a core having an outer leg portion. The circuit board has an outer leg insertion portion through which the outer leg portion of the core is inserted, and the circuit board and the base have therebetween a gap which is air space. The base and at least a lateral face of the outer leg portion are bonded together by a first resin that is insertable from the outer leg insertion portion.
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: June 21, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Nishikawa, Tomoyuki Nakano, Masatoshi Ueno, Masashi Kichima, Kazuya Kato
  • Patent number: 9318252
    Abstract: A magnetic core and a magnetic component using the same are disclosed. The magnetic core has a first magnetic material and a non-uniform filling section in connection; also, the magnetic core has a magnetic flux direction, for which the non-uniform filling section perpendicular to the magnetic flux direction contains at least two kinds of magnetic material. Comparing to a conventional uniform-filling magnetic core, the non-uniform filling section within the magnetic component of the magnetic core can provide higher initial inductance and better DC-bias characteristics; this improved magnetic component can provide higher inductance in specific mandatory loads, or less efficiency loss in a condition of the same inductance provided.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: April 19, 2016
    Inventors: Teng Liu, Ke Dai, Ming-Hui Dai
  • Patent number: 9295145
    Abstract: A magnetic device includes first and second magnetic cores defining first, second, and middle legs extending between first and second back walls, an air gap defined in the middle leg. First, second, and middle legs, and first and second back walls have a substantially equal width. A first winding is located on the first leg, a second winding located on the second leg, and a third winding located on the middle leg. The magnetic device can be part of an electronic ballast circuit including an AC power source, a positive AC rail, a negative AC rail, a resonant capacitor coupled between the positive and negative AC rails, multiple positive and negative lamp terminals configured to couple to respective gas discharge lamps, and windings on a magnetic device coupled between the positive AC rail and respective positive lamp terminals. The third winding is coupled between AC power source and positive AC rail to define a resonant inductor.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: March 22, 2016
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Donald Folker, John J. Dernovsek, Stephen D. Mays, II, Thomas M. Poehlman, Wei Xiong
  • Patent number: 9287762
    Abstract: An inverter switches input voltage Vin to flow an excitation current to excitation winding Np of a transformer and output to a discharger an alternating voltage Vout from the output winding Ns. In an output circuit flowing a current to the discharger, a voltage-responsive connector is connected in series with the winding Ns to interrupt or connect the output circuit according to a voltage applied to between opposed electrodes. The voltage-responsive connector has characteristics of keeping the electrodes in an insulated state until an instantaneous value of the alternating voltage reaches a predetermined value, and holding the electrodes in a conduction state while the instantaneous value of the alternating voltage has reached the predetermined value and continues to exceed the predetermined value, and quickly returning the electrodes to the insulated state when the instantaneous value of the alternating voltage has fallen below the predetermined value.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: March 15, 2016
    Inventors: Hisahiro Kamata, Eiki Hirama, Masahiro Noguchi
  • Patent number: 9282603
    Abstract: The invention relates to a dimmable, multi-channel voltage/current source (47) with several outputs (CH1, CH2) for connecting an electrical load (10, 20), which provides a regulated direct current (I1, I2) at every output (CH1, CH2). The voltage source (47) comprises, for every output (CH1, CH2), a first dimming device (3), with which part of the current (I1?, I2?) flowing to the output (CH1, CH2) can be conducted to a reference potential (GND) and which in each case comprises a switch (17, 27) that is controlled by a first PWM signal, and a second dimming device (4) with a second switch (12, 22) that is arranged in series to the electrical load (10, 20) and which is controlled by a second PWM signal (open1, open2).
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: March 8, 2016
    Assignee: Exscitron GmbH
    Inventors: Stephan Gruber, René Franzky, Winfried Beyer, Gerd Meyhöfer
  • Patent number: 9271342
    Abstract: The power supply system for one or more lighting modules with light-emitting diodes comprises an electrical power source able to be connected to each lighting module via an electrical connection and a detection device to detect a connection direction of each lighting module. The detection device comprises an injection circuit to inject a setpoint current, a first comparison circuit to compute a voltage measured on the corresponding electrical connection following the injection of the setpoint with a first voltage threshold, and an inversion circuit to invert the polarity of the lighting module when the voltage measured on the corresponding electrical connection is greater than or equal to the first voltage threshold.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: February 23, 2016
    Inventors: Jean-Louis Lovato, Dominique Persegol, Alain Dentella
  • Patent number: 9265127
    Abstract: When an operator operates an operation tool of a dimming operation terminal device in order to set the brightness of a lighting load to desired brightness, an energization electric signal, for example, a voltage level detected by a dimming control section changes. The dimming control section generates a dimming signal modulated according to the voltage level. Power supply to the dimming control section is performed by an insulated auxiliary power supply. Transmission of the dimming signal is performed via an insulating section.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: February 16, 2016
    Inventors: Masahiko Kamata, Kenji Takanashi
  • Patent number: 9215773
    Abstract: A control method is disclosed for light dimming. A dimming condition signal is provided to represent whether a light emitting device is expected to be emitting light. The duration when the dimming condition signal is at a logic value indicating the light emitting device is emitting light is a dimming-ON time, in which a close loop is provided to make a power converter convert electric energy to the light emitting device such that the light emitting device is capable of emitting light. A power-ON time is the duration when the power converter converts electric energy to the light emitting device. When the dimming-ON time ends and is less than a minimum power-ON time, the power converter continues converting the electric energy to the light emitting device so as to keep the power-ON time not less than the minimum power-ON time.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: December 15, 2015
    Inventors: Ching-Tsan Lee, Mao-Shih Li
  • Patent number: 9185767
    Abstract: A self-oscillating resonator (SOR) may be used to control current through light emitting diodes (LEDs). The SOR may be started and stopped by a controller coupled to a transistor switch in the SOR. The controller may output a control signal that starts and stops the SOR by coupling a supply voltage or a ground to a base of the transistor switch in the SOR. Additional control over the current output to the LEDs may be gained through a resistive DAC coupled to the SOR and duty cycling the SOR.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: November 10, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Ramin Zanbaghi, Arnab Kumar Dutta, Firas Azrai
  • Patent number: 9048692
    Abstract: The present invention relates to a power converter architecture and its operation principle that supplies an electric load with a controlled direct voltage from both a local direct current electricity source as well as an alternating current (AC) mains with maximum power conversion efficiency. For the case that the local electricity source can not provide enough electricity to the local load it is additionally supplied with electricity from the AC mains. In other case electricity is also feed into the AC grid when a local source can provide more electricity than needed to supply local loads.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: June 2, 2015
    Assignee: Koninklijkle Philips N.V.
    Inventor: Ulrich Boeke
  • Patent number: 9024541
    Abstract: A power distribution system includes controller of a switching power converter to control the switching power converter and determine one or more switching power converter control parameters. In at least one embodiment, the switching power converter utilizes a transformer to transfer energy from a primary-side of the transformer to a secondary-side of the transformer. In at least one embodiment, the switching power converter control parameters includes a secondary-side conduction time delay that represents a time delay between when the primary-side ceases conducting a primary-side current and the secondary-side begins to conduct a secondary-side current. In at least one embodiment, determining and accounting for this secondary-side conduction time delay increases the prediction accuracy of the secondary-side current value and accurate delivery of energy to a load when the controller does not directly sense the secondary-side current provided to the load.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: May 5, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Yanhui Xie, Michael A. Kost, John L. Melanson, Zhaohui He, Chris M. Franklin
  • Patent number: 8987999
    Abstract: The present application discloses a LED driver including: a first and a second auxiliary windings connected in series with each other; a first rectifying device coupled with a terminal of the first auxiliary winding while the other terminal is coupled with the second auxiliary winding; a second rectifying device coupled with a terminal of the second auxiliary winding; a first voltage regulator coupled with the first rectifying device; an unidirectional conducting device having a positive and a negative terminals; and a DC output terminal coupled with the negative terminal of the unidirectional conducting device and configured to provide required DC electricity to a control circuit in the LED driver. The LED driver can guarantee that Vcc voltages provided under a heavy or light load state can always meet the DC power supplying requirements of respective control devices in the driver and meanwhile losses can be reduced.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: March 24, 2015
    Assignee: Delta Electronics, Inc.
    Inventors: Xinghua Zhang, Linwei Chen
  • Patent number: 8970135
    Abstract: An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: March 3, 2015
    Assignee: Dialog Semiconductor Inc.
    Inventors: Junjie Zheng, John W. Kesterson, Richard M. Myers, Baorong Chen, Gordon Chen
  • Patent number: 8957604
    Abstract: A system for implementing mains-voltage-based dimming of a solid state lighting module includes a transformer, a mains sensing circuit and a processing circuit. The transformer includes a primary side connected to a primary side circuit and a secondary side connected to a secondary side circuit, the primary and second side circuits being separated by an isolation barrier. The mains sensing circuit receives a rectified mains voltage from the primary side circuit and generates a mains sense signal indicating amplitude of the rectified mains voltage. The processing circuit receives the mains sense signal from the mains sensing circuit across the isolation barrier, and outputs a dimming reference signal to the secondary side circuit in response to the mains sense signal. Light output by the solid state lighting module, connected to the secondary side circuit, is adjusted in response to the dimming reference signal output by the processing circuit.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: February 17, 2015
    Assignee: Koninklijke Philips N.V.
    Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya, Ajay Tripathi
  • Patent number: 8941317
    Abstract: A power drive system of light-emitting diode (LED) strings includes an isolation transformer, a current-sharing capacitor, two rectifying units, and a current control integrated circuit (IC). The isolation transformer has a primary-side winding and a secondary-side winding with a dotted terminal and a non-dotted terminal. The current-sharing capacitor is connected to the dotted terminal at one terminal thereof. One rectifying units is connected to the other terminal of the current-sharing capacitor, and the other rectifying unit is connected to the non-dotted terminal of the secondary-side winding. Each rectifying unit is connected to one LED string. The current control IC is connected between common points of the rectifying units and corresponding anode terminals of the LED strings and corresponding cathode terminals of the LED strings.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: January 27, 2015
    Assignee: Delta Electronics, Inc.
    Inventors: Te-Chih Liao, Shu-Zheng Huang, Sheng-Hong Wang, Chih-Hao Liu
  • Patent number: 8933642
    Abstract: A driver for an LED lamp assembly includes a rectifier configured to receive an AC power and produce a first DC power and a switching regulator coupled to the rectifier. The switching regulator is configured to receive the first DC power and produce an output DC power. The driver also includes a current controller coupled between the rectifier and the switching regulator. The current controller is configured to damp and stabilize an electric current flowing between the switching regulator and the rectifier.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: January 13, 2015
    Assignee: General Electric Company
    Inventor: Mohamed Cherif Ghanem
  • Patent number: 8917036
    Abstract: A method for operating a HID lamp using a bi-power electromagnetic ballast. The method includes applying a full power level to the lamp to produce full brightness and applying a dimmed power level to the lamp to produce a dimmed brightness. The lamp may be dimmed by switching the lamp power from the full power level to the dimmed power level and then applying a full power pulse to the lamp. The dimmed power level is less than the full power level.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: December 23, 2014
    Assignee: General Electric Company
    Inventors: Janos Laszlo Sneider, Gergely Janos Ormandlaky
  • Patent number: 8917030
    Abstract: An electronic ballast for a lighting unit may include a Power Factor Correction (PFC) circuit, an inverter, and a control circuit for controlling startup of the inverter, wherein the control circuit is coupled between the PFC circuit and the inverter and includes a switching device coupled in a startup loop for the inverter; a unidirectional conductive device coupled between a PFC power supply circuit for providing an operation current to a PFC controller of the PFC circuit and an input of the PFC controller for preventing a startup current flowing through the PFC circuit from triggering the switching device; and a triggering device coupled to the switching device and a connection point between the unidirectional conductive device and the PFC power supply circuit for controlling switch-on and switch-off of the switching device.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: December 23, 2014
    Assignee: OSRAM GmbH
    Inventors: Hong Dai, Yuancheng Guo, Wei Gao, Changsong Ma
  • Patent number: 8912730
    Abstract: A wireless power supply system for lighting includes: a power transmission unit including a power transmission coil; and a power reception unit including a power reception coil. The power transmission coil generates an AC magnetic field in response to a supplied AC power. The power reception coil receives an electric power from the power transmission unit through an electromagnetic induction due to the AC magnetic field generated by the power transmission coil. The power reception unit further includes a power circuit and a receive-side control section. The power circuit receives an output power from the power reception coil and to perform Buck-Boost operation so as to output a predetermined electric power to a lighting load. The receive-side control section controls the Buck-Boost operation of the power circuit. The power circuit is configured to be capable of boosting and stepping-down of the output power from said power reception coil.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: December 16, 2014
    Assignee: Panasonic Corporation
    Inventors: Akira Nakajo, Nadda Chawalarat, Hiroshi Kido
  • Patent number: 8907588
    Abstract: An illumination system detects a peak value of a voltage of a transformer supplying an LED module by analyzing the current value of the voltage and an on-time of the voltage. Based on the detected peak value, a property of the illumination system is adjusted.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: December 9, 2014
    Assignee: Terralux, Inc.
    Inventor: Brian Brandt
  • Patent number: 8907530
    Abstract: A local voltage adjustment apparatus for connection to a power utilization meter comprising a line in for connection to the meter, a line out, a transformer connected to the line in and line out. The transformer has an adjustable voltage conversion ratio of an output voltage level to an input voltage level. The transformer may comprise an autotransformer. A control device is in electrical communication with the line out to sense the level of the output voltage, and is configured to adjust the voltage conversion ratio of the transformer based upon the output voltage level. The control device is configured to select the voltage conversion ratio for the transformer that reduces the output voltage level from the input voltage level to a voltage in a target voltage range. The target voltage range may be from approximately 100 volts to approximately 112 volts.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: December 9, 2014
    Inventor: Paul Saxton
  • Publication number: 20140354172
    Abstract: An illumination system includes a master power supply providing power to several illumination modules. The master power supply is constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current loop. Each illumination module includes an electromagnetic coupling element and several light sources.
    Type: Application
    Filed: April 26, 2014
    Publication date: December 4, 2014
    Inventors: Robert BELAND, Giampaolo CARLI
  • Patent number: 8901840
    Abstract: A lamp ignition system and a lamp ignition method are disclosed, where the lamp ignition system includes a converter, a transformer and a driving circuit. The converter converts an input voltage into an operating voltage for a gas discharge lamp. The transformer has a primary winding and a secondary winding, and the secondary winding is connected to the gas discharge lamp in series. The driving circuit is electrically connected to the primary winding for driving the transformer, so that the secondary winding of the transformer can output a high-frequency voltage to ignite the gas discharge lamp.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: December 2, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Wei-Qiang Zhang, Xiao-Peng Wang, Jian-Ping Ying
  • Patent number: 8896209
    Abstract: A programmed start ballast circuit is presented having a mode control circuit to selectively switch an inverter output load to control operation for cathode preheating, step dimming and/or anti-arcing operation.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: November 25, 2014
    Assignee: General Electric Company
    Inventors: Gang Yao, Bo Zhang, Ting Zhang
  • Patent number: 8884539
    Abstract: According to one embodiment, a rectifying circuit includes a diode, a switching element, a capacitor and an auxiliary winding. The diode is connected between a first terminal and a second terminal while a direction directed from the second terminal to the first terminal is a forward direction. The switching element includes a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the diode, and a gate electrode connected to an anode of the diode. The auxiliary winding is magnetically coupled to an inductor. The auxiliary winding is connected to the gate electrode through the capacitor, and is connected to the second main electrode of the switching element and the cathode of the diode.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 11, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventor: Noriyuki Kitamura
  • Patent number: 8866413
    Abstract: An LED drive circuit, which comprises a transformer, an MOS tube, a power regulating resistor, a direct current isolation circuit, a rectifying circuit, and a voltage control circuit; when the voltage of the control terminal of the voltage control circuit is higher than the threshold voltage of the MOS tube, the MOS tube is on, a current from an external power supply flows through the first winding of the transformer, the MOS tube and the power regulating resistor successively; when the voltage of the power regulating resistor is close to the voltage of the reference terminal of the voltage control circuit, the MOS tube is cut off, the second winding of the transformer charges the capacitor of the MOS tube via the direct current isolation circuit, the rectifying circuit is on, and the first winding of the transformer supplies power to the LED load via the rectifying circuit.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: October 21, 2014
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Dan Cao, Xiang Yang
  • Patent number: 8853955
    Abstract: An approach is provided for devices and methods for using high efficiency ballasted lamps with an electronic transformer, especially for the replacement of traditional halogen lamps from the existing fixtures. The method comprises acts of synchronizing a reference signal to a voltage corresponding to an AC voltage from an AC power source, and driving a load at a predetermined duty cycle. Therefore, the present disclosure is able to drive a load with a desired average output power lower than the minimum load requirement of the electronic transformer yet still allow the electronic transformer to work properly.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: October 7, 2014
    Inventors: Richard Landry Gray, Po Ming Tsai
  • Patent number: 8847517
    Abstract: A system includes a transformer. The transformer includes a first coil and a second coil. The first coil is configured to receive a first voltage based on an output of a switching circuit. The second coil is configured to generate a first current based on the first voltage to power a solid-state load. The system also includes a third coil. The third coil is configured to generate a second voltage based on the first voltage.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: September 30, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Sehat Sutardja, Pantas Sutardja, Wanfeng Zhang, Jinho Choi
  • Patent number: 8829802
    Abstract: In order to keep the advantage of PWM dimming control scheme and make the LED driver high reliability and the LED lamp long lifetime, it is required that the frequency of PWM dimming control scheme is related with or the same as the output frequency of existed dimmers; and the output PWM dimming pulse is covered by the output pulse from dimmers further. The present invention discloses a novel “LED dimming control” scheme to make that the frequency of PWM dimming control scheme is related with or the same as the output frequency of dimmers; and the output PWM dimming pulse is covered by the output pulse from the dimmers further. In this way, it can guarantee that as PWM dimming pulse comes, the output from the dimmer can offer enough power to the LED driver and the LED driver can output the required LED driving current without flicker.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: September 9, 2014
    Inventors: Qi Cui Wei, Zong Bing Li, Xiao Song, Da Feng Weng
  • Patent number: 8816585
    Abstract: A light-emitting diode arrangement has a frame-shaped piezo transformer having at least one output-side connection, and having a light-emitting diode module that generates electromagnetic radiation, which module is disposed within the frame-shaped piezo transformer and electrically connects to the output-side connection of the piezo transformer by at least one output-side electrical conductor, wherein radiation emitted by the light-emitting diode module in the direction of the piezo transformer is reflected at the latter.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: August 26, 2014
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Patrick Rode, Norwin von Malm, Lutz Höppel
  • Patent number: 8803438
    Abstract: Aspects of the disclosure provide a circuit that includes a detection circuit and a controller. The detection circuit is configured to detect a starting of a conduction in a power supply provided via an electronic transformer. The controller is configured to control a current regulating circuit to pull a current from the electronic transformer at a pre-determined level during a time duration following the starting of the conduction, and pull the current at a reduced level according to a pre-determined profile after the time duration.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: August 12, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Pantas Sutardja, InHwan Oh, Wanfeng Zhang
  • Patent number: 8796938
    Abstract: A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: August 5, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Yuji Takahashi, Noriyuki Kitamura, Koji Suzuki, Koji Takahashi, Toru Ishikita
  • Patent number: 8779676
    Abstract: A driver circuit for a dimmable solid state light source, and devices such as lamps and fixtures incorporating the same, and methods of driving such sources, are provided. A supply voltage circuit provides a supply voltage to a power factor controller circuit, such that the supply voltage is maintained within the high end of a nominal supply voltage operating range of the power factor controller circuit. The driver may also include an open circuit protection circuit for disabling the power factor controller circuit when an open circuit occurs in the load, and/or protection against electromagnetic interference (EMI).
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: July 15, 2014
    Assignee: OSRAM SYLVANIA Inc.
    Inventor: Victor M. Simi
  • Patent number: 8773033
    Abstract: A method for driving the backlight unit of the liquid crystal display includes: comparing the strength of a soft start signal with a predetermined signal through a comparator circuit, and generating a first comparison signal or a second comparison signal according to the comparison result; outputting a first frequency from a frequency modulation circuit according to the first comparison signal; and increasing the rising rate of the output voltage of a boost converter according to the first frequency. Therefore, the rising rate of the output voltage is increased, thereby solving the screen-flickering problem.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: July 8, 2014
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Xiang Yang, Xinming Gao, Fei Li