Plural Load Device Systems Patents (Class 315/250)
  • Patent number: 11388798
    Abstract: A method for operating an optoelectronic semiconductor device. The semiconductor device includes a first optoelectronic semiconductor chip for generating, for example, blue light, an optional second optoelectronic semiconductor chip for generating, for example, green light, and a third optoelectronic semiconductor chip for generating, for example, red light. The semiconductor device also includes a driver unit which supplies the semiconductor chips with current during operation. The third semiconductor chip is operated on the basis of a temperature-brightness characteristic curve stored in the driver unit. The temperature-brightness characteristic curve is configured for a minimum color location deviation over an intended operating temperature range, relative to at least one reference color location.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: July 12, 2022
    Assignee: OSRAM OPTO SEMICONDUCTORS GMBH
    Inventors: Martin Moritz, Sebastian Stigler, Uli Hiller, Benjamin Höflinger
  • Patent number: 11323036
    Abstract: A load control device for controlling the amount of power delivered to an electrical load (e.g., an LED light source) includes first and second semiconductor switches, a transformer, a capacitor, a controller, and a current sense circuit operable to receive a sense voltage representative of a primary current conducted through a primary winding of the transformer. The primary winding is coupled in series with a semiconductor switch, while a secondary winding is adapted to be operatively coupled to the load. The capacitor is electrically coupled between the junction of the first and second semiconductor switches and the primary winding. The current sense circuit receives a sense voltage and averages the sense voltage when the first semiconductor switch is conductive, so as to generate a load current control signal that is representative of a real component of a load current conducted through the load.
    Type: Grant
    Filed: April 20, 2021
    Date of Patent: May 3, 2022
    Assignee: Lutron Technology Company LLC
    Inventor: Dragan Veskovic
  • Patent number: 11317487
    Abstract: A driving device is provided. The driving device includes a signal processing circuit and a driving circuit. The signal processing circuit is configured to generate a current input signal according to a target current signal. The driving circuit is configured to receive the current input signal and generate a current output signal according to the current input signal to drive a light emitting element. In a first time interval, the current input signal gradually rises from a first current value to a target current value in a continuous or segmented manner according to a rising slope. Further, a control method of the driving device and a lighting system including the driving device are also provided.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: April 26, 2022
    Assignee: Coretronic Corporation
    Inventors: Wen-Hsin Chang, Shun-Tai Chen, Chung-Lin Ke, Yi-Yuan Peng
  • Patent number: 11272588
    Abstract: A dimming signal processing circuit having multiple functions includes a dimming signal input terminal and a dimming signal output terminal, and further includes an input signal processing circuit, a modulation circuit, an isolation circuit and an output shaping circuit connected in cascade to the dimming signal input terminal, and an oscillation signal output circuit connected to the modulation circuit, wherein the output shaping circuit comprises a plurality of signal output circuits connected to the dimming signal output terminal respectively. The dimming signal processing circuit having multiple functions is low in cost and high in practicability, and meets new laws and regulations and more use requirements.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: March 8, 2022
    Assignee: SHENZHEN SOSEN ELECTRONICS CO., LTD
    Inventors: Chaoyang Zou, Song Pan
  • Patent number: 11074858
    Abstract: A display device includes: a substrate; a display element layer on one surface of the substrate and including at least one light emitting element emitting light; and a pixel circuit portion on the display element layer and including at least one transistor electrically connected to the light emitting element, wherein the display element layer includes: a first electrode on the substrate and electrically connected to one end of the light emitting element; a second electrode on the substrate and electrically connected to the other end of the light emitting element; and an insulation layer on the substrate including the second electrode, and having a first opening exposing a portion of the second electrode, and wherein the second electrode is electrically connected to the transistor through the first opening.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: July 27, 2021
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyun Min Cho, Sung Chul Kim, Dae Hyun Kim, Hye Yong Chu, Jong Hyuk Kang, Keun Kyu Song, Joo Yeol Lee, Bek Hyun Lim, Hyun Deok Im
  • Patent number: 11064586
    Abstract: AC-driven light-emitting diode systems and methods are provided for driving LED devices (e.g., LED lighting) using AC power. For example, an integrated circuit includes a first power line and a second power line configured for connection to AC power, and a plurality of LED stages, wherein each LED stage comprises multiple serially-connected LED devices, switches connected to inputs and outputs of the LED stages. The integrated circuit further includes switch control circuitry configured to control the switches to selectively connect one or more of the LED stages to the first and second power lines to empower the LED stages with the AC power.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: July 13, 2021
    Assignee: Intelesol, LLC
    Inventors: Mark D. Telefus, Stephen C. Gerber
  • Patent number: 11013082
    Abstract: A load control device for controlling the amount of power delivered to an electrical load (e.g., an LED light source) includes first and second semiconductor switches, a transformer, a capacitor, a controller, and a current sense circuit operable to receive a sense voltage representative of a primary current conducting through to a primary winding of the transformer. The primary winding is coupled in series with a semiconductor switch, while a secondary winding is adapted to be operatively coupled to the load. The capacitor is electrically coupled between the junction of the first and second semiconductor switches and the primary winding. The current sense circuit receives a sense voltage and averages the sense voltage when the first semiconductor switch is conductive, so as to generate a load current control signal that is representative of a real component of a load current conducted through the load.
    Type: Grant
    Filed: April 17, 2020
    Date of Patent: May 18, 2021
    Assignee: Lutron Technology Company LLC
    Inventor: Dragan Veskovic
  • Patent number: 11005264
    Abstract: A load control system for controlling the amount of power delivered from an AC power source to a plurality of electrical load includes a plurality of independent units responsive to a broadcast controller. Each independent unit includes at least one commander and at least one energy controller for controlling at least one of the electrical loads in response to a control signal received from the commander. The independent units are configured and operate independent of each other. The broadcast controller transmits wireless signals to the energy controllers of the independent units. The energy controllers do not respond to control signals received from the commanders of other independent units, but the energy controllers of both independent units respond to the wireless signals transmitted by broadcast controller. The energy controller may operate in different operating modes in response to the wireless signals transmitted by the broadcast controller.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: May 11, 2021
    Assignee: Lutron Technology Company LLC
    Inventors: Walter S. Zaharchuk, Timothy S. Majewski, Christopher Buck, Daniel Vander Valk, John H. Bull, Joel S. Spira
  • Patent number: 10983550
    Abstract: An illumination switch device includes a push button, a plurality of indicator lenses, a holder, a detector, a plurality of light emitters, and a base. The push button has an internal space and an opening. Each indicator lens has a columnar shape. The indicator lenses are juxtaposed in the internal space of the push button. The holder holds the push button such that the push button is movable in a longitudinal direction of each indicator lens. The detector detects a displacement of the push button in the longitudinal direction. The light emitters are respectively disposed opposite one ends of the indicator lenses in the longitudinal direction. The base is made of an opaque resin, and covers side faces of the indicator lenses while being in tight contact with the side faces. The base is integrated with the indicator lenses.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: April 20, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takeshi Miyaoka, Takuya Sasaki
  • Patent number: 10976374
    Abstract: A battery information processing system includes an analyzer configured to analyze a result of measurement of an AC impedance of a module M. The analyzer plots the result of measurement of the AC impedance on a first frequency characteristic diagram which is a Bode diagram (a first diagram) relating to a real number component of the AC impedance and on a second frequency characteristic diagram which is a Bode diagram (a second diagram) relating to an imaginary number component of the AC impedance, obtains a polynomial curve L1 by fitting processing onto a result of plotting on the first diagram and obtains a polynomial curve L2 by fitting processing onto a result of plotting on the second diagram, and converts the polynomial curves L1 and L2 into an impedance curve Z on a Nyquist diagram.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: April 13, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Kazuya Kodama
  • Patent number: 10879059
    Abstract: An elongated microwave powered lamp (1) having one or more bulbs with any length or shape or disposition according to a linear series, straight or curved, includes: at least one transparent elongated bulb (2) containing, in an inner space thereof, a material apt to be excited by microwave irradiation thereby emitting an electromagnetic radiation; a coaxial microwave antenna placed outside the bulb (2) and respectively connected to a microwave source (81) via corresponding antenna lead (91), said bulb (2) and said at least one microwave coaxial antenna being displaced in a close relationship to each other to allow the microwave excitation of said material, wherein the outer tubular conductor of the coaxial antenna (5) has spaced holes (6) formed therethrough and facing the bulb (2), at which microwaves are released toward the bulb.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: December 29, 2020
    Assignee: CONSIGLIO NAZIONALE DELLE RICERCHE
    Inventors: Carlo Ferrari, Iginio Longo
  • Patent number: 10834792
    Abstract: AC-driven light-emitting diode systems and methods are provided for driving LED devices (e.g., LED lighting) using AC power. For example, an integrated circuit includes a first power line and a second power line configured for connection to AC power, and a plurality of LED stages, wherein each LED stage comprises multiple serially-connected LED devices, switches connected to inputs and outputs of the LED stages. The integrated circuit further includes switch control circuitry configured to control the switches to selectively connect one or more of the LED stages to the first and second power lines to empower the LED stages with the AC power.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: November 10, 2020
    Assignee: Intelesol, LLC
    Inventors: Mark D. Telefus, Stephen C. Gerber
  • Patent number: 10790774
    Abstract: A drive system for an electric motor includes a first inverter that includes first switching elements, a second inverter that includes second switching elements, and a control unit that includes a first inverter control calculation section controlling on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control calculation section controlling on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, and a control synchronization section synchronizing the first carrier wave with the second carrier wave. When a sum of voltages of the first voltage source and the second voltage source is more than a voltage determination threshold, and torque of a rotating electric machine is smaller than a torque determination threshold, the control synchronization section synchronizes the first carrier wave with the second carrier wave.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: September 29, 2020
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimitsu Takahashi, Masahito Fujieda, Tetsuya Yamada, Ryuji Omata, Kiyotaka Matsubara, Makoto Nakamura, Daigo Nobe
  • Patent number: 10749340
    Abstract: A power switch includes a bridge-connected switching circuit with (1) a pair of MOSFETs back-to-back in series between line and load connections, an interconnection point of the MOSFETs being a first common connection, and (2) a pair of diodes back-to-back between the line and load connections, an interconnection point of the diodes being a second common connection. A line/load controller has supply inputs connected to the first and second common connections for receiving operating power, and (1) places both MOSFETs in the ON state to deliver normal operating current to the load for normal operation, and (2) places both MOSFETs in the OFF state to deliver (by body diode conduction) a substantially reduced leakage current to the load when the load is not powered for normal operation, the leakage current providing the operating power to the line/load controller.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: August 18, 2020
    Assignee: Bel Fuse (MACAO COMMERCIAL OFFSHORE) Limited
    Inventors: Mark Jutras, Scott Moore, Mark Masera
  • Patent number: 10721687
    Abstract: There are provided an information transmitter and an apparatus including the same. The information transmitter includes a signal generator configured to output an information signal including pulses changed from a first state to a second state or a third state and subsequently changed from the second state or the third state to the first state. A time period in which some of the pulses are changed from the first state to the second state or the third state may be shorter than a time period in which some of the pulses are changed from the second state or the third state to the first state. The information transmitter also includes a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: July 21, 2020
    Assignee: WITS Co., Ltd.
    Inventors: Hee Seung Kim, Jae Sun Won, Hugh Kim, Jae Suk Sung
  • Patent number: 10713996
    Abstract: A display panel is provided. In the display panel, a plurality of pixels respectively including a plurality of sub pixels are arranged in a matrix form on a glass. Each of the plurality of sub pixels includes a driving circuit disposed on the glass and configured to receive a PAM data voltage and a PWM data voltage, and an inorganic light emitting device configured to emit a light based on a driving current provided from the driving circuit. The PAM data voltage is applied at once to the plurality of pixels included in the display panel. The driving circuit compensates a deviation between driving circuits included in each of the plurality of sub pixels based on a driving voltage of the driving circuit, and controls a pulse width of a driving current having an amplitude corresponding to the applied PAM data voltage based on the applied PWM data voltage.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: July 14, 2020
    Assignees: SAMSUNG ELECTRONICS CO., LTD., RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Jinho Kim, Yongsang Kim, Sangmin Shin, Jongsu Oh, Youngki Jung
  • Patent number: 10674447
    Abstract: There are provided an information transmitter and an apparatus including the same. The information transmitter includes a signal generator configured to output an information signal including pulses changed from a first state to a second state or a third state and subsequently changed from the second state or the third state to the first state. A time period in which some of the pulses are changed from the first state to the second state or the third state may be shorter than a time period in which some of the pulses are changed from the second state or the third state to the first state. The information transmitter also includes a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: June 2, 2020
    Assignee: WITS Co., Ltd.
    Inventors: Hee Seung Kim, Jae Sun Won, Hugh Kim, Jae Suk Sung
  • Patent number: 10665756
    Abstract: An optoelectronic device comprises a substrate; a groove on the substrate; a plurality of semiconductor units on the substrate and separated by the groove, wherein each semiconductor unit comprises a first semiconductor layer, a second semiconductor layer, and an active region interposed between the first semiconductor layer and the second semiconductor layer; a connecting part crossing the groove for connecting two of the plurality of semiconductor units, wherein the connecting part comprises one end on the first semiconductor layer and another end on the second semiconductor layer; a first electrode comprising a plurality of first extensions jointly connected to the one end of the connecting part; and a second electrode comprising a plurality of second extensions jointly connected to the another end of the connecting part, wherein an amount of the plurality of first extensions is different from an amount of the plurality of second extensions.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: May 26, 2020
    Assignee: EPISTAR CORPORATION
    Inventors: Chang-Huei Jing, Chien-Fu Shen
  • Patent number: 10652966
    Abstract: Current through an illumination source is controlled by means of a feedback loop whereby the current is measured and fed back to a current controller, which compares this to a set-point and based thereon outputs a current control signal which controls downstream power circuitry driving the current through the illumination source. This keeps the illumination at a steady dim level. Data is also coded into the illumination by modulating the current control signal, i.e. at the output of the current controller, but prior to the input to the power circuitry. The present disclosure provides a compensation filter arranged to apply a compensation to the error signal, to at least partially remove an effect of a distortion of the current measurement caused by the modulation of the data symbols into the illumination source current.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: May 12, 2020
    Assignee: SIGNIFY HOLDING B.V.
    Inventors: Erik De Wilde, Jurgen Margriet Antonius Willaert
  • Patent number: 10645779
    Abstract: A load control device for controlling the amount of power delivered to an electrical load (e.g., an LED light source) includes first and second semiconductor switches, a transformer, a capacitor, a controller, and a current sense circuit operable to receive a sense voltage representative of a primary current conducting through to a primary winding of the transformer. The primary winding is coupled in series with a semiconductor switch, while a secondary winding is adapted to be operatively coupled to the load. The capacitor is electrically coupled between the junction of the first and second semiconductor switches and the primary winding. The current sense circuit receives a sense voltage and averages the sense voltage when the first semiconductor switch is conductive, so as to generate a load current control signal that is representative of a real component of a load current conducted through the load.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: May 5, 2020
    Assignee: Lutron Technology Company LLC
    Inventor: Dragan Veskovic
  • Patent number: 10555396
    Abstract: A light emitting device, which includes a plurality of light emitting elements each having a different chromaticity of emission light, to emit mixed light produced by mixing the respective emission light of the plurality of light emitting elements together, includes a receiving section to obtain command information on the mixed light, a driving section to perform a PWM drive on the plurality of light emitting elements on the basis of the command information, and a storing section to store correction information to be set on the basis of measurement results on the respective emission light of the plurality of light emitting elements. The driving section is being configured in such a manner as to, on the basis of the correction information, correct a duty ratio in the PWM drive to be set in accordance with the command information, and perform the PWM drive on the plurality of light emitting elements.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: February 4, 2020
    Assignee: TOYODA GOSEI CO., LTD.
    Inventors: Yasutsugu Sugiura, Taro Isogai, Kazuki Yabashi
  • Patent number: 10548196
    Abstract: The invention relates a system for determining a change in a room (1). The invention comprises in particular a self-teaching illuminating system which detects a presence of an individual in an illuminated area. The system comprises lighting means (2) which output light, control means (3) which control the luminous output from the lighting means (2), measuring means (4) which determine a luminous intensity, and an evaluation means (6) which evaluates the luminous intensity determined by the measuring means (4). The evaluation means (6) is designed to detect a change of an object/individual in the room (1), starting from a determined luminous intensity at at least one first time, at which the lighting means (2) outputs no light, and a luminous intensity at at least one second time, at which the lighting means (2) outputs light.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 28, 2020
    Assignee: TRIDONIC GMBH & CO KG
    Inventor: Thomas Ondrisek
  • Patent number: 10548197
    Abstract: In a single lighting device including a large number of light-emitting elements (LEEs), the LEEs are divided into separately powered groups, and different combinations of the groups are fully energized to achieve the desired overall brightness. In some embodiments, the number of LEEs in each group has a binary relationship to the other groups. The resolution of the dimming is the brightness of the smallest group. In one example of five binary weighted groups of LEEs, 32 brightness levels can be achieved while the LEEs in the energized groups are fully ON. Thus, since there is no high frequency switching, there is substantially no power dissipation by the dimming control system, and there is limited noise or EMI created. The dimming control can be easily implemented with a logic circuit controlling a transistor switch for each group.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: January 28, 2020
    Assignee: Quarkstar LLC
    Inventors: Wilson Dau, George Lerman, Ferdinand Schinagl, Jacqueline Teng, Allan Brent York
  • Patent number: 10467982
    Abstract: An electronic device has a display with a pixel array overlapping an array of temperature sensors. Control circuitry in the device may gather temperature measurements from the temperature sensor array. The control circuitry may apply a global offset to the temperature measurements and may apply a damping factor to the globally offset measurements to produce a two-dimensional temperature profile for the display. A look-up table or other data structure may be used to store information on pixel color correction gain values as a function of temperature. This temperature-gain information and temperature information from the two-dimensional temperature profile may be used by display circuitry in the device to display color-corrected images on the display.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: November 5, 2019
    Assignee: Apple Inc.
    Inventors: Mahnaz Mohammadi, Adria Fores Herranz, Marc Albrecht, Alexander P. Yu, Ross Thompson, Daming Xu, Suraj P. Gorkhali, Heesang Suh, Mookyung Son, Victor H. Yin, Judith C. Segura, Mingkun Li, Jay Mayur Khandhar
  • Patent number: 10433377
    Abstract: An LED lighting device comprises at least one LED selectively energizable to develop light and a control circuit coupled to the LED that develops a command signal comprising first and second command signal components for controlling the at least one LED to cause the LED to develop light comprising a desired brightness in response to the first command signal component. The control circuit controls the at least one LED to cause the LED to develop light comprising a further desired parameter magnitude other than desired brightness in response to the second command signal component, and the first signal component comprises an IEC 0-10 volt analog lighting control.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: October 1, 2019
    Assignee: IDEAL INDUSTRIES LIGHTING LLC
    Inventors: Daniel Pope, Jun Zhang, Michael B. Gilliom
  • Patent number: 10405387
    Abstract: Provided is a light emission device. When the size of an input voltage exceeds a minimum light emission voltage, all light emission elements emit light always irrespective of the size of a voltage, and as the size of the voltage decreases, the light emission device has a configuration in which the light emission elements are connected in parallel with each other, and as the size of the voltage increases, the light emission device has a configuration in which the light emission elements are connected in series with each other.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: September 3, 2019
    Assignee: LUMENS CO., LTD.
    Inventors: Soo Geun Yoo, Hong Geol Choi, Ho Young Lee, Myeong Kook Gong
  • Patent number: 10368412
    Abstract: In described examples, a circuit for controlling a light emitting diode (LED) includes a switch control circuit to generate a first control signal for a first switch coupled in parallel with the LED. The switch control circuit generates the first control signal responsive to a magnitude of loop current through the first switch relative to a first reference signal. A switch driver generates a second control signal for a second switch coupled to the first switch via an inductor. The first switch driver generates the second control signal responsive to the magnitude of the loop current through the first switch relative to the first reference signal.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: July 30, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: John Peter Fenske, Muhammad Roshanali Rajabali, Jeffrey Scott Farris
  • Patent number: 10237959
    Abstract: A discharge lamp lighting device includes a control unit adapted to control a frequency of the AC electric current supplied to a discharge lamp by a feeding unit, in different manners within a first term and a second term which are alternately repeated, the control unit is adapted to control the frequency of the AC electric current such that, within the first term, the frequency of the AC electric current becomes at least one frequency out of plural set frequencies, and is further adapted to control the frequency of the AC electric current, based on a predetermined frequency and an electric current within the previous first term, such that, within the second term, the frequency of the AC electric current becomes a frequency lower than this predetermined frequency.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: March 19, 2019
    Assignee: USHIO DENKI KABUSHIKI KAISHA
    Inventors: Kosuke Saka, Minoru Fukuda, Shigeyoshi Matsumoto, Shoichi Terada
  • Patent number: 10219335
    Abstract: A load control device for controlling the amount of power delivered to an electrical load (e.g., an LED light source) includes first and second semiconductor switches, a transformer, a capacitor, a controller, and a current sense circuit operable to receive a sense voltage representative of a primary current conducting through to a primary winding of the transformer. The primary winding is coupled in series with a semiconductor switch, while a secondary winding is adapted to be operatively coupled to the load. The capacitor is electrically coupled between the junction of the first and second semiconductor switches and the primary winding. The current sense circuit receives a sense voltage and averages the sense voltage when the first semiconductor switch is conductive, so as to generate a load current control signal that is representative of a real component of a load current conducted through the load.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: February 26, 2019
    Assignee: LUTRON ELECTRONICS CO., INC.
    Inventor: Dragan Veskovic
  • Patent number: 10178730
    Abstract: A method and apparatus for a horticultural light for use in a horticultural facility that uses current sharing across any one or more LED strings within the horticultural light. A processor determines the current requirements of the one or more LED strings that are needed to produce a given intensity level. The processor then apportions the current generation capability of a DC-DC converter across all active LED strings using time division multiple access whereby each LED string conducts its apportioned current within its allocated time slot to the mutual exclusion of the remaining active LED strings in the allocated time slot. The processor employs analog (continuous) and/or digital (discontinuous) dimming techniques within each time slot to further modulate the amount of current conducted by any LED string within its allocated time slot.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: January 8, 2019
    Assignee: Illum Horticulture LLC
    Inventors: Stephen P. Adams, James V. Rhodes, Arthur A. Wilkes
  • Patent number: 10104725
    Abstract: A multi-channel current control circuit and method are disclosed herein. The multi-channel current control includes an operational amplifier provided for a channel; a low pass filter provided for the channel connected to an input terminal of the operational amplifier; a mode control circuit configured to control the low pass filter to have one of predetermined time constants in accordance with predetermined current control mode; and a pulse width modulation circuit configured to generate a pulse width modulation signal provided for the channel; and transfer the pulse width modulation signal to the input terminal of the operational amplifier via the low pass filter. The operational amplifier controls a load current of the channel using an output voltage of the operational amplifier.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: October 16, 2018
    Assignee: ABOV SEMICONDUCTOR CO., LTD.
    Inventor: Chang Min Kim
  • Patent number: 10091851
    Abstract: Herein is disclosed a dual-pathway LED dimmer, including a first reference voltage node; a load including one or more light emitting diodes, the load connected in series with the first reference voltage node; a second reference voltage node; a first load pathway and a second load pathway, connected in parallel between the load and the second reference voltage node; wherein the first load pathway includes a first inductor and a first transistor, connected in series; and wherein a second load pathway includes a second inductor and a second transistor, connected in series; and one or more controllers, configured to control the first transistor and the second transistor.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: October 2, 2018
    Assignee: Intel IP Corporation
    Inventors: Tobias Lang, Klaus Doth
  • Patent number: 10076008
    Abstract: The invention relates to an optoelectronic circuit intended to receive, between a first node and a second node, a variable voltage, the optoelectronic circuit including: a plurality of light-emitting diodes series-assembled between the first node and a third node; a first current limitation/regulation circuit assembled between the third node and the second node; a switching circuit coupling the third node to at least certain light-emitting diodes of the plurality of light-emitting diodes; a capacitor including first and second plates; a first diode having its cathode connected to the second plate and having its anode coupled to the second node; and a second diode having its anode connected to the second plate and having its cathode coupled to the third node or to a second current limitation/regulation circuit.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: September 11, 2018
    Assignee: EASII IC
    Inventors: David Gras, Olivier Valorge
  • Patent number: 10009970
    Abstract: A power supply device includes converters, a command circuit, and a setter. The converters correspond to loads. The command circuit controls the converters. The setter sets a magnitude of an output of at least one target converter of the converters in accordance with an output characteristic representing a relationship between an input voltage of the at least one target converter and an output limit value which is an upper limit value of the output from the at least one target converter. The output characteristic is a characteristic that the output limit value decreases as the input voltage lowers when the input voltage is lower than a threshold. The setter varies the threshold of the output characteristic in accordance with an operation status of the converters and sets the magnitude of the output from the at least one target converter in accordance with the output characteristic whose threshold has been varied.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: June 26, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Akihiro Kishimoto, Toshiaki Nakamura, Kenichi Fukuda, Kazuya Kato
  • Patent number: 9949326
    Abstract: A light system is disclosed. The light system includes a light emitting diode (LED) and a shunt transistor having a current path connected to the LED. A ramp generator circuit generates a ramp voltage. An amplifier has a first input terminal connected to the LED, a second input terminal coupled to receive the ramp voltage, and an output terminal connected to a control terminal of the shunt transistor.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: April 17, 2018
    Assignee: Texas Instruments Incorporated
    Inventors: Peter Mikael Elo, Ari Kalevi Väänänen
  • Patent number: 9913339
    Abstract: In a single lighting device including a large number of light-emitting elements (LEEs), the LEEs are divided into separately powered groups, and different combinations of the groups are fully energized to achieve the desired overall brightness. In some embodiments, the number of LEEs in each group has a binary relationship to the other groups. The resolution of the dimming is the brightness of the smallest group. In one example of five binary weighted groups of LEEs, 32 brightness levels can be achieved while the LEEs in the energized groups are fully ON. Thus, since there is no high frequency switching, there is substantially no power dissipation by the dimming control system, and there is limited noise or EMI created. The dimming control can be easily implemented with a logic circuit controlling a transistor switch for each group.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: March 6, 2018
    Assignee: Quarkstar LLC
    Inventors: Wilson Dau, George Lerman, Ferdinand Schinagl, Jacqueline Teng, Allan Brent York
  • Patent number: 9907139
    Abstract: Methods and circuits for controlling LEDs are disclosed. In one embodiment, a multistage driver for driving a plurality of serially connected LEDs includes a voltage regulator circuit configured to receive a rectified AC voltage, where the voltage regulator circuit includes a depletion device configured to generate a unregulated voltage using the rectified AC voltage, a band gap voltage reference circuit configured to generate a plurality of reference voltages using the unregulated voltage, and a current setting circuit configured to control the plurality of serially connected LEDs using the plurality of reference voltages.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: February 27, 2018
    Assignee: MIKPOWER, Inc.
    Inventors: Thomas Chao, John Huang
  • Patent number: 9898994
    Abstract: The present invention provides a voltage generation circuit, comprising a control unit, a controlled unit and an output unit, and the control unit receives a trigger signal to generate a control signal having a preset delay, and the control unit is further coupled to the controlled unit to control the controlled unit to be in a first state in a duration of the preset delay and to be in a second state in a duration of a non-preset delay, and the output unit outputs a first drive voltage to the drive unit as the controlled unit is in the first state and to output a second drive voltage to the drive unit as the controlled unit is in the second state, and the first drive voltage is smaller than the second drive voltage to achieve decreasing the drive voltage to lower power consumption of the data drive chip.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: February 20, 2018
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventors: Dongsheng Guo, Mingliang Wang
  • Patent number: 9886913
    Abstract: The present invention provides an LED backlight color temperature adjustment circuit, including a driving chip, an LED backlight module and a control module. The driving chip includes: a driving unit, employed to drive a display panel to show an image; an image data extraction unit, extracting a present display image data of the display panel; an image data analysis unit, employed to calculate a deviation value of the color temperature of the present display image data and a standard color temperature; and a color temperature adjustment unit, employed to generate and output a color temperature adjustment according to the deviation value of the color temperature of the present display image data and the standard color temperature. The LED backlight module includes a plurality of first LEDs which are identical and coupled in series and a plurality of first LEDs which are identical and coupled in series.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: February 6, 2018
    Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd
    Inventors: Xingling Guo, Jinjie Zhou
  • Patent number: 9831400
    Abstract: A light-emitting apparatus includes: a substrate; a plurality of LED chips disposed on the substrate and including a plurality of blue LED chips which emit blue light and a plurality of red LED chips which emit red light; and a sealing member that contains a yellow phosphor and seals the plurality of LED chips together. The plurality of LED chips include: a first LED chip group made up of the blue LED chips; a second LED chip group made up of the red LED chips and disposed around the first LED chip group in an annular shape centered on an optical axis; and a third LED chip group made up of the blue LED chips and disposed around the second LED chip group in an annular shape centered on the optical axis.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: November 28, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Koji Omura, Masumi Abe
  • Patent number: 9826586
    Abstract: A power supply includes an input for receiving a first DC voltage, an output for outputting a second DC voltage, a voltage conversion circuit configured to convert the first DC voltage into the second DC voltage, and a control circuit configured to control the voltage conversion circuit to vary a voltage value of the second DC voltage. The control circuit is configured to control the voltage conversion circuit so as to decrease the voltage value of the second DC voltage from a first voltage value to a second voltage value for a predetermined duration every time a predetermined period elapses. The first voltage value is equal to or greater than a voltage value necessary to keep lighting a light source. The second voltage value is smaller than the voltage value necessary to keep lighting the light source.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: November 21, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masashi Motomura, Hirofumi Konishi, Kenichi Fukuda
  • Patent number: 9655177
    Abstract: A load control device for controlling the amount of power delivered to an electrical load (e.g., an LED light source) comprises an isolated forward converter comprising a transformer, a controller, and a current sense circuit operable to receive a sense voltage representative of a primary current conducting through to a primary winding of the transformer. The primary winding is coupled in series with a semiconductor switch, while a secondary winding is adapted to be operatively coupled to the load. The forward converter comprises a sense resistor coupled in series with the primary winding for producing the sense voltage that is representative of the primary current. The current sense circuit receives the sense voltage and averages the sense voltage when the semiconductor switch is conductive, so as to generate a load current control signal that is representative of a real component of a load current conducted through the load.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: May 16, 2017
    Assignee: LUTRON ELECTRONICS CO., INC.
    Inventor: Dragan Veskovic
  • Patent number: 9596730
    Abstract: A system allows a light fixture to have a wider range of color temperatures (CCT) while limiting the warmest temperature reached at full intensity. The CCT of the light output may be controlled independently of intensity across a certain range of CCT and dependent on intensity across another range. In an implementation, both intensity and CCT may be adjusted from a single handle, where the interface positions may be divided into multiple zones. In another implementation, intensity may be adjusted from a first handle, while CCT may be adjusted from a second handle. The CCT of the light output may be limited to cooler levels when the intensity is higher, and/or the intensity of the light may be limited to lower levels when the CCT is warmer.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: March 14, 2017
    Assignee: ABL IP Holding LLC
    Inventors: David Ciccarelli, Daniel Aaron Weiss, Benjamin Marshall Suttles
  • Patent number: 9521720
    Abstract: A device and method for controlling the supply of power to light sources, in which a DC/DC converter is capable of delivering a voltage VMAX to the light sources. The forward voltage of the light sources depends on temperature and may temporarily exceed VMAX at low temperatures. The invention proposes means that allow the required forward voltage to be decreased automatically depending on a measurement of ambient temperature.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: December 13, 2016
    Assignee: Valeo Vision
    Inventor: Patrick Wacheux
  • Patent number: 9516723
    Abstract: A system having an alternating current (AC) driven LED unit, an AC voltage regulator, and a controller is provided. The AC driven LED unit includes a first LED and a second LED coupled in reverse parallel. The AC voltage regulator is operable to receive AC voltage originating from an AC voltage source, regulate the AC voltage according to control signals from the controller, and apply regulated AC voltage to the AC driven LED unit, so as to enable the first LED and the second LED to emit light according to the regulated AC voltage. In addition, a method is provided for driving the LED by regulating the AC voltage. By regulating the AC voltage using the AC voltage regulator, benefits of restraining voltage fluctuations, reducing THD, improving power factor, providing dimming control, and mitigating flicker phenomenon can be achieved.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: December 6, 2016
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Saijun Mao, Yunfeng Liu, Xiaoming Yuan, Yingqi Zhang, Charles Adrian Becker, Junhui Fei, Jian Wang
  • Patent number: 9468065
    Abstract: An LED backlight controller combines global/hybrid and local brightness/dimming control for an LED backlight illuminator with local regions illuminated by associated LED strings. Global/hybrid brightness/dimming control performs hybrid digital modulation control for a predefined lower range of brightness levels, with string current maintained at a substantially constant level associated with a predefined maximum brightness for the lower range (controlling brightness by adjusting digital modulation, such as PWM duty cycle, up to a maximum), and performs hybrid string current control for a predefined higher range of brightness levels (controlling brightness by adjusting string current). Local dimming control is performed by introducing a local digital modulation signal into a hybrid digital modulation control path for the associated string, so that digital modulation for the associated string is a combination of local digital modulation and global/hybrid digital modulation.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: October 11, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Ari Kalevi Väänänen
  • Patent number: 9456478
    Abstract: A single board light engine includes an AC to AC step driver that selectively powers multiple LED segments by controlling tap points between the LED segments as the input voltage goes from zero crossover to maximum voltage and returns to zero crossover. The step driver may power a first LED segment, a second LED segment, both the first and second LED segments, or none of the LED segments depending upon the input voltage level. The LEDs within an LED segment may share a characteristic that differs from a characteristic shared by LEDs in another segment, which allows the LED fixture to provide a variety of lighting effects.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 27, 2016
    Assignee: ABL IP Holding LLC
    Inventors: Yan Rodriguez, Mark Anthony Hand, Philip Sieczkowski
  • Patent number: 9380675
    Abstract: Described herein are systems, devices, and methods related to adjusting the intensity of specific wavelengths in an illumination panel based on the presence of a person near the panel. By reducing some emitted wavelengths, such as wavelengths associated with blue light, when such wavelengths are not needed or desired, the lifetime and/or efficiency of the lighting panel can be increased. The systems, devices, and methods can be used to reduce energy costs and also to delay the aging of lighting panels.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: June 28, 2016
    Assignee: Universal Display Corporation
    Inventors: Michael Hack, Emory Krall, Ruiqing Ma
  • Patent number: 9380664
    Abstract: Provided is a lighting system that includes a plurality of lighting elements which emit light, a power supply which supplies power, a lighting driver comprising a microcontroller and which outputs power to the plurality of lighting elements for operation thereof; and a control system which transmits a control signal to the microcontroller to initiate a standby mode of the plurality of lighting elements. The microcontroller receives the control signal and decreases output power supplied to the plurality of lighting elements, while remaining in a low power consumption mode for communicating with the control system during standby mode.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: June 28, 2016
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Nina Rose Scheidegger, Carre Denise Scheidegger, Gang Yao
  • Patent number: 9345092
    Abstract: In a single lighting device including a large number of light-emitting elements (LEEs), the LEEs are divided into separately powered groups, and different combinations of the groups are fully energized to achieve the desired overall brightness. In some embodiments, the number of LEEs in each group has a binary relationship to the other groups. The resolution of the dimming is the brightness of the smallest group. In one example of five binary weighted groups of LEEs, 32 brightness levels can be achieved while the LEEs in the energized groups are fully ON. Thus, since there is no high frequency switching, there is substantially no power dissipation by the dimming control system, and there is limited noise or EMI created. The dimming control can be easily implemented with a logic circuit controlling a transistor switch for each group.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: May 17, 2016
    Assignee: Quarkstar LLC
    Inventors: Wilson Dau, George Lerman, Ferdinand Schinagl, Jacqueline Teng, Allan Brent York