Discharge Device And/or Rectifier In The Primary Circuit Of The Supply Transformer Patents (Class 315/206)
  • Patent number: 11382196
    Abstract: A dimming mode detection circuit for an LED lighting system that receives an alternating current input voltage and generates a bus voltage to drive an LED load, the dimming mode detection circuit including: a leading edge detection circuit configured to generate a leading edge detection signal by detecting a leading edge of a first voltage representative of the bus voltage in one sine half-wave cycle, in order to determine whether the LED lighting system operates in a leading edge dimming mode; and a trailing edge detection circuit configured to generate a trailing edge detection signal in accordance with a time length of a first interval from a first value of the first voltage in a previous sine half-wave cycle to a second value of the first voltage in a next sine half-wave cycle, in order to determine whether the LED lighting system operates in a trailing edge dimming mode.
    Type: Grant
    Filed: March 23, 2021
    Date of Patent: July 5, 2022
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Xiaohua Sun, Hao Chen
  • Patent number: 11297706
    Abstract: Disclosed are detection circuit and device of TRIAC dimmer and detection method. Detection circuit comprises line voltage sampling module, peak voltage sampling module, average voltage sampling module, judgment module, bleeder module, line voltage sampling module samples line voltage, outputs sampling voltage to peak voltage sampling module and average voltage sampling module; peak voltage sampling module outputs first comparison voltage to judgment module according to sampling voltage, average voltage sampling module outputs second comparison voltage to judgment module according to sampling voltage; judgment module compares first comparison voltage with second comparison voltage and outputs control signal according to comparison result to control connection or disconnection of bleeder module; bleeder module provides discharge current for TRIAC dimmer when being connected.
    Type: Grant
    Filed: July 16, 2021
    Date of Patent: April 5, 2022
    Inventors: Yu'An Ye, Xunsheng Deng, Wenpan Wang
  • Patent number: 11259382
    Abstract: A control circuit and method for a bleeder, a chip, and a driver system. The bleeder control circuit is connected to a dimmer detector used for detecting the presence or absence of a dimmer and a type of the dimmer. The control circuit of the bleeder is used to receive a detection signal outputted by the dimmer detector, and generate a control signal for the bleeder according to the detection signal, the control signal is used to control an operating state of the bleeder. The application correspondingly generates a control signal for a bleeder according to a detection signal indicating the presence or absence of a dimmer and the type of the dimmer so as to control the bleeder to operate only at a given phase interval, and may thereby reduce the power consumption of the bleeder when ensuring the stable operation of a dimmer.
    Type: Grant
    Filed: October 30, 2020
    Date of Patent: February 22, 2022
    Assignee: Shanghai Bright Power Semiconductor Co., Ltd.
    Inventors: Wei-Jia Yu, Min-Min Fan, Feng Qi
  • Patent number: 10547248
    Abstract: A rectifier circuit and a dimmer circuit are provided, comprising: an isolating driver circuit, a switching control circuit, a before-bridge damper circuit, and a rectifier bridge. The isolating driver circuit is connected to the before-bridge damper circuit via the switching control circuit, two ends of the switching control circuit are connected to two input ends of the rectifier bridge, respectively, and two ends of the before-bridge damper circuit are connected to the two input ends of the rectifier bridge, respectively. In the disclosed rectifier circuit and damper circuit, the isolating driver circuit receives the after-bridge control signal after the rectifier bridge, the switching control circuit controls connection or disconnection of the before-bridge damper circuit to the rectifier circuit based on the after-bridge control signal.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: January 28, 2020
    Assignee: SENGLED CO., LTD.
    Inventors: Zhibin Tian, Junshan Lou, Jinxiang Shen
  • Patent number: 10219334
    Abstract: According to the present disclosure, a circuit arrangement for operating semiconductor light sources includes: a power input for inputting an AC input voltage, an output having a first output terminal, and a second output terminal, which is designed to connect a string of semiconductor light sources, a control input for controlling the operation of the circuit arrangement with a control signal, a rectifier circuit for converting the AC input voltage into a rectified voltage, a converter circuit for transforming the rectified voltage into a current which is suitable for the semiconductor light sources, a first switch arranged between the converter circuit and the output, for the switching of the current through the semiconductor light sources, and a first diode arranged between the first switch and the output, or between the converter circuit and the first switch.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: February 26, 2019
    Assignee: OSRAM GMBH
    Inventors: Olaf Busse, Alfons Lechner, Siegfried Mayer, Horst Werni, Christof Schwarzfischer
  • Patent number: 10039171
    Abstract: The present invention particularly discloses a novel feedback circuit, mainly comprising: a signal sampling unit, a feedback unit, a signal concerting unit, and a signal adjusting unit. During the operation of the feedback circuit, a current-mode error amplifier unit is configured to output a current error signal based on a current sampling signal and a dimming signal outputted by the signal converting unit, so as to activate a PWM controlling unit to stabilize an output current of a LED driver circuit. In the meantime, a voltage-mode error amplifier unit cooperates with the PWM controlling unit to adaptively regulate an output voltage of the LED driver circuit based on a voltage sampling signal and an adjustment signal outputted by the signal adjusting unit, in order to facilitate the LED driver circuit provides a constant output power.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: July 31, 2018
    Assignee: MEANWELL (GUANGZHOU) ELECTRONICS CO., LTD.
    Inventors: Nan Li, Jian-Dong Yang
  • Patent number: 10027130
    Abstract: There are provided an apparatus apparatus for transmitting power wirelessly. The apparatus for transmitting power wirelessly may include a boosting unit boosting an input voltage, and an inverter unit inverting the boosted voltage output from the boosting unit to transmit power wirelessly. The inverter unit and the boosting unit are controlled by the same switching element.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: July 17, 2018
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Sang Ho Cho, Chang Ik Kim, Seung Won Park, Yong Woon Park, Sang Beom Lee, Eun Young Shin, Jae Suk Sung, Jae Hyoung Cho
  • Patent number: 10008946
    Abstract: A primary-side regulated (PSR) current control system under a LLC topology includes a voltage polarity converting circuit, a current signal sampling circuit, a current cross-over detecting circuit, a zero current detecting circuit, and a current integrator circuit.
    Type: Grant
    Filed: November 19, 2017
    Date of Patent: June 26, 2018
    Assignee: YU JING ENERGY TECHNOLOGY CO., LTD.
    Inventor: Sen-Tai Yang
  • Patent number: 9837913
    Abstract: A resonant power converter is provided with capacitive switching mode protection. The converter produces output current and voltage according to an operating frequency, which is desirably maintained above a resonant frequency for the power converter. A controller regulates the operating frequency based on an output current relative to a reference value, which may be provided via a dimming interface. A capacitive switching mode is determinable, based on a positive relationship in a detected direction of change in an output value relative to a detected direction of change in the operating frequency. When the capacitive switching mode is determined, a preceding operating frequency is enacted and the controller disables regulation of the operating frequency therefrom. Inductive mode switching is determinable with a negative relationship between detected direction of change in the output value relative to direction of change in the operating frequency, wherein regulation of operating frequency is renewed.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: December 5, 2017
    Assignee: UNIVERSAL LIGHTING TECHNOLOGIES, INC.
    Inventor: Wei Xiong
  • Patent number: 9750107
    Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: August 29, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jiqing Yang, Zhuoyan Li, Lieyi Fang
  • Patent number: 9622300
    Abstract: An SSL assembly is described, which comprises an alternating current, referred to as AC, solid state lighting, referred to as SSL, unit. The AC SSL unit comprises at least two SSL devices which are arranged in an anti-parallel manner with respect to one another. Furthermore, the SSL assembly comprises a driver circuit which comprises a resonant circuit that is configured to adapt an input AC drive voltage at an input of the resonant circuit into an output AC drive voltage; wherein the output AC drive voltage is applied to the AC SSL unit.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: April 11, 2017
    Assignee: Dialog Semiconductor (UK) Limited
    Inventor: Horst Knoedgen
  • Patent number: 9532418
    Abstract: A switched mode power supply comprising: a rectified voltage terminal and a rectified ground terminal for receiving a phase-cut rectified voltage; a power switch and an inductive element connected in series between the rectified voltage terminal and the rectified ground terminal; a switch controller having a floating ground terminal and a dimming input terminal, wherein the dimming input terminal is for receiving a dimming voltage signal indicative of a required dimming level, wherein the switch controller is configured to control the switch in accordance with the dimming voltage signal and wherein the inductive element is connected between the rectified ground terminal and the floating ground terminal; and a dimming level controller configured to set the dimming voltage signal in accordance with the rectified phase-cut voltage with respect to the floating ground terminal.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: December 27, 2016
    Assignee: Silergy Corp.
    Inventors: Leendert van den Broeke, Ewold van Geffen, Frank Schoofs
  • Patent number: 9507901
    Abstract: Method determines a configuration of capacitors in an output filter of a switched mode power supply (SMPS). Candidate configurations are generated, each associated with a respective cost function value calculated based on number of capacitors of each kind in the candidate configuration and cost assigned to each kind of capacitor. The candidate configurations are ordered based on their cost function values. A binary search through the ordered candidate configurations determines a capacitor configuration associated with a lowest cost function value to allow a defined load transient response requirement of the SMPS. Whether a candidate configuration allows the defined load transient response requirement of the SMPS is determined using a model of a SMPS having the candidate configuration of the output filter simulating deviation of output voltage of the SMPS in response to change in load current of the SMPS and determining whether the defined load transient response requirement is allowed.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: November 29, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Magnus Mellteg, Magnus Karlsson, Daniel Nilsson
  • Patent number: 9438099
    Abstract: Reducing voltage excursions in a circuit comprises: performing resonant commutation, including transferring, via a first set of one or more diodes, energy stored by a set of one or more parasitic inductances to a set of one or more capacitors; and performing recovery-to-load, including discharging energy stored in the set of one or more capacitors via a second set of one or more diodes, through the set of one or more parasitic inductances to a load of the circuit.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: September 6, 2016
    Inventor: Fred O. Barthold
  • Patent number: 9084306
    Abstract: A dimming circuit for a light-emitting diode fixture includes a dimming switch, a signal transfer device, and a timer. The dimming switch can include a dimming switch and generate a current at a first voltage level, where the current corresponds to a dimmer setting of the dimmer switch. The signal transfer device can include an input communicably coupled to an output, where the input of the signal transfer device is electrically coupled to the dimming switch, and where the output of the signal transfer device generates a signal at a second voltage level based on the current received by the input. The timer can be electrically coupled to the output of the signal transfer device and to a LED driver, where the timer generates a pulse width modulation (PWM) signal based on the signal, and where the timer sends the PWM signal to the LED driver.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: July 14, 2015
    Assignee: Cooper Technologies Company
    Inventors: Christopher Lee Bohler, Li Li, Vaske Mikani
  • Patent number: 9060406
    Abstract: A circuit for the power regulation of an LED comprises a converter having a switch. The LED is interconnected in an output circuit, wherein a control unit controls the magnetization of an inductor, in that it actively clocks the switch. A measured actual value representative of the average value of the LED current is returned to the control unit and compared to a reference value.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 16, 2015
    Assignees: TRIDONIC GMBH and CO KG, TRIDONIC AG
    Inventors: Eduardo Pereira, Michael Zimmermann, Alexander Barth, Markus Mayrhofer, Guenter Marent
  • Publication number: 20150115824
    Abstract: A light emitting diode driver includes a power supplying unit receiving an alternating current (AC) power and outputting a transformed power according to a predetermined ratio, a rectifying unit rectifying the output power from the power supplying unit, and a double voltage unit receiving the rectified power from the rectifying unit and generating an output voltage such that the level of the output voltage is variable, and has constant duty and frequency thereof even the variance of the voltage level.
    Type: Application
    Filed: October 14, 2014
    Publication date: April 30, 2015
    Inventors: Keun Wook LEE, Byoung Woo RYU
  • Patent number: 9018847
    Abstract: Thyristor dimming circuits and methods are disclosed herein. In one embodiment, a thyristor dimming circuit can include: (i) a thyristor and a rectifier bridge configured to receive a sinusoidal AC voltage, and to generate a phase-loss input voltage; (ii) a power stage circuit configured to have the phase-loss input voltage applied thereto, the power stage circuit having a main switch and being configured to drive a lamp load through electrical conversion; and (iii) a discharging circuit configured, during a first predetermined time interval, to control the main switch to operate with a fixed duty cycle at a fixed frequency, where the first predetermined time interval begins prior to an absolute value of the sinusoidal AC voltage being reduced to zero, the first predetermined time interval ending when the phase-loss input voltage is again applied to the power stage circuit.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: April 28, 2015
    Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd.
    Inventors: Feng Yu, Xiaodong Huang
  • Publication number: 20150091466
    Abstract: A two-stage LED driver for providing a substantially constant output current to an LED load, and related methods and systems. The first stage of the LED driver includes a conventional power factor correction (PFC) circuit that outputs a direct current (DC) voltage and a DC current. The second stage of the LED driver includes a low voltage flyback circuit that receives the DC voltage and the DC current. The low voltage flyback circuit includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided by the low voltage flyback circuit to the LED load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents.
    Type: Application
    Filed: October 1, 2013
    Publication date: April 2, 2015
    Applicant: General Electric Company
    Inventor: Yehuda Daniel Levy
  • Publication number: 20150069925
    Abstract: The invention relates to a LED light source comprising: input terminals (K1, K2) for connection to a mains voltage supply source, a rectifier (RB) coupled to the input terminals for rectifying the mains supply voltage supplied by the mains supply voltage source and comprising rectifier output terminals, a DC-DC converter (CONV) for generating a DC current out of the rectified mains supply voltage, comprising converter input terminals connected to the rectifier output terminals and comprising a first converter output terminal (A) and a second converter output terminal (B), —a LED load (LL) with an anode coupled to the first converter output terminal via a current control element (D5) for blocking a current flowing from the anode of the LED load to the first converter output terminal, and with a cathode coupled to the second converter output terminal via a first controllable switch (M1) having a control electrode coupled to first control circuitry for rendering the controllable switch non-conductive in case the
    Type: Application
    Filed: February 22, 2013
    Publication date: March 12, 2015
    Applicant: Koninklijke Philips N.V.
    Inventors: Geert Willem Van Der Veen, Wilhelmus Josephus Cornelissen
  • Publication number: 20150022100
    Abstract: The invention is provided with an LED driving device and the control method. The driving device includes power converter, microprocessor and LED circuit. Wherein the power converter includes impulse transformer and switch control circuit. Primary winding at input side of the impulse transformer connects with rectifier filter circuit by the switch control circuit. Secondary winding at output side and auxiliary winding connect with power end of the microprocessor by constant voltage control switch. Output end of the microprocessor connects with LED circuit. The LED driving device and the control method provided by this invention collects on/off signal of mechanical lamp by using switch control circuit. Light is adjusted by LED circuit driven by the microprocessor, and thus heat elimination effect is improved, power consumption is lowered and brightness is enhanced.
    Type: Application
    Filed: March 30, 2012
    Publication date: January 22, 2015
    Inventors: Hong Zhang, Xiaobin Gu, Xiaoming Wu, Laijian Chen, Wei Cheng, Hanniu Gong
  • Publication number: 20150002041
    Abstract: Disclosed herein is a voltage control circuit for a dimmer and a dimming method. In accordance with an embodiment, the dimming method using a voltage control circuit for a dimmer includes the steps of determining whether a current voltage value input to a constant dimming range maintainer is equal to a preset minimum or maximum voltage value or exists between the minimum and maximum voltage values, and determining whether the current voltage value is greater than the maximum voltage value when the current voltage value isn't equal to the minimum or maximum voltage value or doesn't exist between the minimum and maximum voltage values. The method further includes the steps of updating the minimum voltage value to the current voltage value when the current voltage value isn't greater than the maximum voltage value, and updating the maximum voltage value to the current voltage value when the current voltage value is greater than the maximum voltage value.
    Type: Application
    Filed: January 2, 2014
    Publication date: January 1, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Yun Joong LEE, Je Hyeon YU, Chang Seok LEE, Chan Woo PARK
  • Patent number: 8907579
    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: December 31, 2013
    Date of Patent: December 9, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Masahiko Kamata, Kenji Takanashi
  • Publication number: 20140354167
    Abstract: A power supply apparatus and a driving method thereof are disclosed The power supply apparatus includes: a dimmer controlling externally input power; a converter including a switch, and converting an output of the dimmer according to a duty of the switch and supplying a first current to a load; a dimming feedback unit receiving a first voltage corresponding to the first current, and having a finite gain in a DC state; and a controller controlling the duty of the switch according to an output of the dimming feedback unit. A duty of the switch is controlled according to an output of such a dimming feedback unit so that a dimming operation is performed.
    Type: Application
    Filed: June 2, 2014
    Publication date: December 4, 2014
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: SangCheol MOON, Gwanbon KOO
  • Patent number: 8896207
    Abstract: The present invention is directed to a fluorescent light fixture assembly including a ballast and a novel lighting element that includes an array of LEDs and at least one converter module that enables the existing ballast providing an AC power input to supply DC power to the LED array. The lighting element includes a body that contains the LED array and the converter modules and shares the configuration of the lighting element that is to be retrofitted. The lighting element receives power from the pre-existing ballast, wherein the converter module provides a constant current source to power the LED array. Thus, the lighting element, including the converter module, replaces the conventional fluorescent light tube in a cost-effective retrofit manner with the existing ballast.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: November 25, 2014
    Assignee: ElectraLED Inc.
    Inventors: James Thomas, Gary Gatesman, James Mosier
  • Publication number: 20140306616
    Abstract: An LED drive circuit applied between an LED load and an AC power supply is provided. The circuit includes a rectifier, a power conversion module, a voltage regulator, a photo coupler and a controller. The rectifier rectifies and converts an AC voltage outputted from the AC power supply into a DC voltage. The power conversion module converts the DC voltage into a first drive voltage and a second drive voltage. The first drive voltage drives the LED load. The voltage regulator receives and processes the second drive voltage with a voltage regulating process to generate a third drive voltage not exceeding a maximum voltage rating of the controller. The photo coupler generates a feedback signal according to a signal outputted from the LED load. The controller receives the third drive voltage and generates a control signal to control the power conversion module according to the feedback signal.
    Type: Application
    Filed: November 12, 2013
    Publication date: October 16, 2014
    Applicant: Lextar Electronics Corporation
    Inventor: En-Min Wu
  • Publication number: 20140300289
    Abstract: Embodiments of a dimmable driver circuit for a light-emitting diode (LED) load and a method for driving an LED load are described. In one embodiment, a dimmable driver circuit for an LED load includes an alternating current (AC)-direct current (DC) rectifier configured to convert an AC input voltage into a DC voltage, a damper and filter circuit configured to provide a latching current to a phase-cut dimmer and to suppress an inrush current caused by phase-cut dimming, and to filter electromagnetic interference (EMI) noise from the DC voltage, and a switching converter circuit connected to the damper and filter circuit and configured to operate in a boundary conduction mode (BCM) with a constant on-time to generate DC power for the LED load in response to the DC voltage. Other embodiments are also described.
    Type: Application
    Filed: March 13, 2014
    Publication date: October 9, 2014
    Applicant: NXP B.V.
    Inventor: Yan Zhu
  • Patent number: 8847493
    Abstract: The invention is directed to an electrical module and a method for illuminating a HID lamp on a vehicle, and in particular an off-road recreational vehicle. The electrical module and the method involve a capacitor and a voltage delay mechanism. The capacitor may be charged during the operation of the vehicle or when the operator wishes to illuminate the HID lamp. The voltage delay mechanism comprises a charge-actuated switch and a breakdown voltage means for preventing the supply of current to the HID lamp until the capacitor is charged to a voltage sufficient to illuminate the HID lamp. The voltage delay mechanism also comprises a power-actuated latch relay for maintaining the charge-actuated switch in a position that bypasses the breakdown voltage device, so that the HID lamp remains illuminated even after the voltage has decreased to the operating requirements of the HID lamp.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 30, 2014
    Inventor: Michael Dentinger
  • Publication number: 20140285103
    Abstract: A programmable driver for driving a solid state lighting device includes a processing circuit, a voltage feedback loop and a power stage. The processing circuit is configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit. The voltage feedback loop is configured to receive the voltage reference signal and to determine a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device. The power stage is configured to limit maximum output voltage for driving the solid state lighting device based at least in part on the determined difference between the reference voltage and the drive voltage of the solid state lighting device provided by the voltage feedback loop.
    Type: Application
    Filed: August 30, 2012
    Publication date: September 25, 2014
    Inventors: Kaustuva Acharya, Raman Nair Harish Gopala Pillai, Yimin Chen, Ajay Tripathi
  • Publication number: 20140265904
    Abstract: A dimmer circuit may include: a rectification module, a control module and an output module, wherein the control module receives an input signal rectified through the rectification module and controls the output module to supply a load with an output signal in accordance with the input signal, and a compensation module which collects sampled signals characterizing dimming state of the dimmer circuit between the control module and the output module, and supplies the control module with a compensation signal in accordance with the sampled signals, the control module changing the value of the output signal according to the input signal and the compensation signal.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Inventors: Yaping Liu, Zeke Wei, Dan Lin, Yan Li
  • Publication number: 20140252974
    Abstract: The present invention relates to a lighting apparatus which stably performs dimming control on a lamp implemented with light emitting diodes (LEDs) or the like. The lighting apparatus may improve power efficiency by driving power supplied to a lamp in a current regulation method, perform constant current control such that the lamp maintains constant brightness, perform dimming control for controlling the brightness of the lamp, commonly supply the power provided to the lamp to peripheral circuit modules, and perform constant voltage control such that a driving voltage supplied as power is maintained at a predetermined level or more.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 11, 2014
    Applicant: SILICON WORKS CO., LTD.
    Inventors: Yong Geun KIM, Dong Il KIM, Sang Young LEE, Ki Chul AN
  • Patent number: 8786204
    Abstract: There are provided a DC/DC converter and a driving apparatus having the same. The DC/DC converter includes a DC/DC converter part converting an input power into a predetermined DC power by switching the input power to thereby supply the converted DC power to a light emitting device; and a control part controlling switching of the DC/DC converter part in accordance with a driving signal applied to the light emitting device to thereby control a voltage level of the DC power.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: July 22, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Sang Gab Park, Nam Jin Park, Heung Gyoon Choi, Han Hee Lee, Hyo Joong An, Kyu Min Park, Su Hun Jo
  • Publication number: 20140184087
    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: Application
    Filed: December 31, 2013
    Publication date: July 3, 2014
    Applicant: TOSHIBA LIGHTING AND TECHNOLOGY CORPORATION
    Inventors: Masahiko KAMATA, Kenji TAKANASHI
  • Publication number: 20140139129
    Abstract: Thyristor dimming circuits and methods are disclosed herein. In one embodiment, a thyristor dimming circuit can include: (i) a thyristor and a rectifier bridge configured to receive a sinusoidal AC voltage, and to generate a phase-loss input voltage; (ii) a power stage circuit configured to have the phase-loss input voltage applied thereto, the power stage circuit having a main switch and being configured to drive a lamp load through electrical conversion; and (iii) a discharging circuit configured, during a first predetermined time interval, to control the main switch to operate with a fixed duty cycle at a fixed frequency, where the first predetermined time interval begins prior to an absolute value of the sinusoidal AC voltage being reduced to zero, the first predetermined time interval ending when the phase-loss input voltage is again applied to the power stage circuit.
    Type: Application
    Filed: October 2, 2013
    Publication date: May 22, 2014
    Applicant: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Feng Yu, Xiaodong Huang
  • Publication number: 20140132171
    Abstract: A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal.
    Type: Application
    Filed: December 17, 2013
    Publication date: May 15, 2014
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Lighting & Technology Corporation
    Inventors: Hirokazu Otake, Takuro Hiramatsu, Mitsuhiko Nishiie
  • Publication number: 20140132170
    Abstract: A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal.
    Type: Application
    Filed: December 17, 2013
    Publication date: May 15, 2014
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Lighting & Technology Corporation
    Inventors: Hirokazu Otake, Takuro Hiramatsu, Mitsuhiko Nishiie
  • Patent number: 8710760
    Abstract: A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding, a secondary winding receiving a power induced from the primary winding, and a tertiary winding receiving the power induced from the primary winding. The first output unit is connected to the secondary winding of the transformer, and outputs a first power current to an LED in a first operating condition. The second output unit is connected to the tertiary winding of the transformer, and outputs a second power current to the LED in a second operating condition. When the LED is connected to the power supply apparatus for LED, the power supply apparatus allows a current equal to or less than a predetermined current to flow in the LED, thereby protecting the LED from an overcurrent.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: April 29, 2014
    Assignee: LG Innotek Co., Ltd.
    Inventors: Kyung Rae Cho, Dong Young Huh
  • Publication number: 20140111108
    Abstract: Embodiments of the present invention provide a light-emitting diode (LED) driver and method of controlling the static current of the LED driver. In some embodiments, the LED driver is configured to calculate output currents of a pulse form using a small number of parameters and adjust a gate control signal using the mean value of the output currents of a pulse form. Accordingly, the LED driver can be used to control a static current that flows through an LED array connected to a circuit on the secondary side of a transformer using a DC voltage or an AC voltage supplied to the primary side of the transformer. In some embodiments, the LED driver includes a power conversion unit, switching unit, transformer, zero current detection unit, and system control unit. In some embodiments, the system control unit is configured to adjust the gate control signal.
    Type: Application
    Filed: September 17, 2013
    Publication date: April 24, 2014
    Applicant: SILICON WORKS CO., LTD.
    Inventors: Wanyuan QU, Ju Pyo HONG, Ok Hwan KWON, Chang Sik SHIN, Kyung Min KIM, Byeong Ho JEONG, Yong Goo KIM, Young Suk SON
  • Patent number: 8664878
    Abstract: An arc detection circuit that detects an occurrence of arcing between ballast and a lamp is provided. A transformer has a primary side connected between the ballast and the lamp to receive lamp current and conduct the lamp current from the ballast to the lamp during normal operation. A secondary side of the transformer produces a transformer voltage as a function of the lamp current received by the primary side. The produced transformer voltage is less than a threshold value during normal operation and greater than the threshold value during an occurrence of arcing between the ballast and the lamp. The arc detection circuit reduces the produced transformer voltage and provides it to the ballast so as to shut down the ballast operation.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: March 4, 2014
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Ayan Choudhury, Arindam Chakraborty
  • Patent number: 8643295
    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: March 12, 2012
    Date of Patent: February 4, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Masahiko Kamata, Kenji Takanashi
  • Publication number: 20140028212
    Abstract: The LED driver includes a rectifier, a switching circuit and a feedback circuit. The rectifier connects an AC power source and outputting DC power. The switching circuit connects the DC power of the rectifier to switch the DC power with pulse width modulation (PWM) and has an output end for connecting a load and a feedback control end. The feedback circuit is connected between the output end and the feedback control end of the switching circuit for controlling a duty cycle of the switching circuit depending on an output current of the output end to keep the output current constant.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 30, 2014
    Inventors: San Chuang, Joe Chen, Rocky Shi, Justin Chang
  • Publication number: 20140021879
    Abstract: Disclosed are dimmable LED driver circuits and methods. A dimmable LED driver can include: an SCR, an electronic transformer, and a rectifier bridge to convert an AC voltage to a DC voltage signal; a power stage circuit that receives the DC voltage signal, and outputs a constant current to drive an LED load, where the power stage circuit includes first and second power stage circuits, the first power stage circuit receiving the DC voltage signal, and generating a first output voltage to the second power stage; and an input current control circuit that receives an input current of the first power stage circuit and the first output voltage, and generates a first control signal to control the input current as a square wave signal during an on time of the SCR, and the input current is substantially zero during an off time of the SCR.
    Type: Application
    Filed: June 12, 2013
    Publication date: January 23, 2014
    Inventors: Feng Yu, Xiaodong Huang
  • Publication number: 20140015432
    Abstract: According to one embodiment, a power supply device includes a full-wave rectifier, a power converting circuit, and a partial smoothing circuit. The power converting circuit converts an output of the full-wave rectifier into a direct-current voltage according to a switching action of a switching element. The partial smoothing circuit includes, in series, a capacitor and a first diode connected in polarity opposite to output polarity of the full-wave rectifier. The partial smoothing circuit is provided on an output side of the full-wave rectifier in parallel to the power converting circuit. In the partial smoothing circuit, the capacitor is charged according to the switching action of the switching element of the power converting circuit. The partial smoothing circuit supplies charged electric of the capacitor to the power converting circuit via the first diode in a trough portion of an output voltage of the full-wave rectifier.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 16, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Hirokazu OTAKE, Noriyuki KITAMURA, Yuji TAKAHASHI, Hiroshi AKAHOSHI
  • Publication number: 20130307429
    Abstract: A ballast and method for operating a ballast includes a switch or other circuit for connecting and disconnecting a voltage multiplier to a rectifier circuit. A control circuit for controlling the switch senses an input voltage and connects the voltage multiplier to the rectifier circuit when an input voltage falls below a selected voltage level.
    Type: Application
    Filed: December 31, 2012
    Publication date: November 21, 2013
    Applicant: FULHAM COMPANY LIMITED
    Inventor: Fulham Company Limited
  • Patent number: 8587209
    Abstract: A method of operating an LED driver including a power converter to generate an output current for powering an LED and to provide active power factor correction is disclosed. The power converter is coupled between an input to receive a rectified AC voltage and an output for providing the output current to the LED. The method includes operating the power converter at a substantially fixed frequency in an open loop mode based on a current through the inductive element and the rectified AC voltage. LED drivers operable in accordance with the disclosed method are disclosed.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: November 19, 2013
    Assignee: Astec International Limited
    Inventor: Antonio R. Soleño
  • Patent number: 8587207
    Abstract: An electronic ballast for a light emitting load is provided, and includes a transformer module, a resonance module, a high-frequency push-pull inverter and a driving controller module. The high-frequency push-pull inverter includes a first switch component and a second switch component. The driving controller module is used for generating and providing an asymmetric driving waveform to the first switch component and the second switch component. The asymmetric driving waveform includes a first discharging waveform portion for discharging and turning off the first switch component, and also a second discharging waveform portion for discharging and turning off the second switch component. The first and second discharging waveform portions are different in current amplitudes and time spans.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: November 19, 2013
    Assignee: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Tsung-Yu Ou
  • Patent number: 8581505
    Abstract: A power control system includes a transformer and a controller regulates a current on a secondary-side of the transformer based on a primary-side signal value. In at least one embodiment, the secondary-side current is a current out of a filter coupled to a rectifier and the secondary-side of the transformer and into a load. In at least one embodiment, the primary-side signal value is a sample of a current in the primary-side windings of the transformer. In at least one embodiment, the primary-side signal value represents a sample value of a primary-side transformer current. Proper timing of sampling the primary-side signal value substantially eliminates contributions of a transformer magnetizing current from the primary-side transformer current sample. Sampling the primary-side signal value when contributions of the transformer magnetizing current are substantially eliminated allows at least an average of the secondary-side current to be determined from the primary-side signal value.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: November 12, 2013
    Assignee: Cirrus Logic, Inc.
    Inventor: John L. Melanson
  • Patent number: 8575862
    Abstract: Disclosed herein is a power supply suitable for use with an airfield lighting device. In accordance with an example embodiment, there is disclosed herein, a rectifier that converts a signal from an alternating current (AC) current source to a direct current (DC) voltage. The circuit comprises a current sensor, a controller, and a half active bridge rectifier. The controller receives a signal from the current sensor and controls the operation of the half active bridge rectifier to produce a light emitting diode (LED) current based on the current sensed by the current sensor.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: November 5, 2013
    Assignee: ADB Airfield Solutions
    Inventor: Leo Dubrovsky
  • Publication number: 20130271021
    Abstract: A power converter device for converting power from a mains power supply (201) to power a solid state lighting load (280) includes a converter (230) and a control circuit (350). The converter (230) includes a half-bridge inverter (220) that functions as a boost inverter and output stage inverter, the half-bridge inverter having multiple switches (221, 222). The control circuit (350) is configured to control a mains input current and an output current of the device independently by providing a switching signal (S_HB) to the switches in the half-bridge inverter, where the switching signal has a duty cycle, a frequency and a cycle skipping duty cycle.
    Type: Application
    Filed: December 13, 2011
    Publication date: October 17, 2013
    Applicant: KONINKLIJKE PHILIPS N.V.
    Inventor: Reinhold Elferich
  • Publication number: 20130257304
    Abstract: A switching power source device includes: a direct power source; and a chopper circuit including a pair of input terminals connected to the direct power source and a pair of output terminals connected to a load, the chopper circuit including a first inductor, a second inductor magnetically coupled to the first inductor, a third inductor connected to the first inductor, a switching element causing an augmented current to flow from the direct power source to the first and third inductors while turned on, a constant current element connected to the switching element in series, a rectifier element causing a reduced current to flow through the first and third inductors while the switching element is turned off, and a drive circuit controlling and turning off a gate voltage of the switching element after the switching element is turned on and the augmented current reaches a constant current element saturated state.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
    Inventors: Yuji Takahashi, Noriyuki Kitamura, Hirokazu Otake, Toshio Tsuji