Current Regulator In The Primary Circuit Patents (Class 315/279)
  • Patent number: 10716179
    Abstract: A single fire-wire bi-directional power fetching and dimmer control system, comprising: a dimmer circuit, that includes at least a dimmer driver and two connected bi-directional power electronic components; a single fire-wire bi-directional power fetching module, connected in series between the two bi-directional power electronic components, to perform single fire-wire power fetching when the dimmer circuit is conducting; a high side buck, connected in parallel to the dimmer circuit; and a DC to DC converter, with input end of the converter used for fetching power connected to the single fire-wire bi-directional power fetching module, and the high side buck; and with output end of the converter used for supplying power connected to the dimmer driver of the dimmer circuit. As such, single fire-wire bi-directional dimming can be performed, to raise significantly its range of control, while fetching enough power to drive Wi-Fi and 5G communication.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: July 14, 2020
    Assignee: LOONG YEE INDUSTRIAL CORP., LTD.
    Inventor: Chi-Jen Wang
  • Patent number: 9894730
    Abstract: An apparatus and computer readable storage medium are disclosed for supplying power to a load such as a plurality of light emitting diodes. A representative apparatus comprises a primary module, a first secondary module couplable to a first load, and a second secondary module couplable to a second load. The primary module comprises a transformer having a transformer primary. The first secondary module comprises a first transformer secondary magnetically coupled to the transformer primary, and the second secondary module comprises a second transformer secondary magnetically coupled to the transformer primary, with the second secondary module couplable through the first or second load to the first secondary module.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: February 13, 2018
    Assignee: Chemtron Research LLC
    Inventor: Patrice R. Lethellier
  • Patent number: 9882389
    Abstract: Systems, methods, and devices for use in a DC/DC converter. A circuit uses a full-bridge power semiconductor subcircuit along with a high power transformer subcircuit, a diode bridge subcircuit, and a parallel capacitor to provide galvanic isolation and boost the voltage from a power source such as a photovoltaic panel. To ensure zero voltage switching for the power semiconductors, either a passive auxiliary subcircuit or an inductor coupled in parallel to a transformer in the transformer subcircuit may be used. A controller which derives its timing signals from the transformer primary current is used to control the timing of the power semiconductors in the circuit. The circuit and its controller allows for self-adjusting regardless of load and uses the entire switching cycle to be used for power transfer.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: January 30, 2018
    Assignee: SPARQ SYSTEMS INC.
    Inventors: Majid Pahlevaninezhad, Shangzhi Pan, Praveen Jain
  • Patent number: 9419435
    Abstract: The present invention is directed to an intelligent dimmer that is capable of “learning” the type of load it is controlling, and adjusts its operating parameters accordingly. The present invention can adaptively drive electrical loads over a wide range of wattages. The intelligent dimmer of the present invention is configured to automatically calibrate itself based on the load current demands of a particular electrical load. The intelligent dimmer of the present invention also adaptively limits in-rush currents to extend the life expectancy of the solid state switching components used therein.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: August 16, 2016
    Assignee: PASS & SEYMOUR, INC.
    Inventor: Anthony Testani
  • Patent number: 9325236
    Abstract: A power system includes a controller to control a switching power converter, and the controller is configured to automatically transition operation of the switching power converter, during each cycle of an input voltage to the switching power converter, between operating in discontinuous conduction mode and critical conduction mode.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: April 26, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Jean-Charles Pina, Robert T. Grisamore, John L. Melanson, Yanhui Xie
  • Patent number: 9232577
    Abstract: A method of controlling a power driver for LED illumination may include receiving, by a power correction unit, an AC voltage from the outside, rectifying the received AC voltage into a DC voltage, and correcting a power factor of the rectified DC voltage; and receiving, by a DC/DC converter unit, the DC voltage from the power factor correction unit and converting the received DC voltage into a DC voltage which has a magnitude different from the received DC voltage and is supplied to an LED module. A skip control unit, which is disposed in the DC/DC converter unit, may be fed back with a current flowing in the LED module driven by receiving the output from the DC/DC converter unit to detect a magnitude of the current and output a signal for a skip mode control depending on the detected magnitude of the current.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: January 5, 2016
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byoung Woo Ryu, Jung Woo Choi, Ki Hong Kim
  • Patent number: 9184590
    Abstract: The present invention is directed to an intelligent dimmer that is capable of “learning” the type of load it is controlling, and adjusts its operating parameters accordingly. The present invention can adaptively drive electrical loads over a wide range of wattages. The intelligent dimmer of the present invention is configured to automatically calibrate itself based on the load current demands of a particular electrical load. The intelligent dimmer of the present invention also adaptively limits in-rush currents to extend the life expectancy of the solid state switching components used therein.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: November 10, 2015
    Assignee: Pass & Seymour, Inc.
    Inventor: Anthony Testani
  • Patent number: 9030119
    Abstract: A solid state lighting driver arrangement exhibiting a plurality of LED strings receiving power from a single power source, the single power source providing a discontinuous current, wherein a plurality of first windings are provided, each associated with a particular LED string and coupled to provide current balancing between the various LED strings. The discontinuous current resets the windings during the off time or during a reversal period. In one particular embodiment, a second winding is magnetically coupled to each of the first windings, and the second windings are connected in a closed in-phase loop. In another particular embodiment, at least two of the first windings are magnetically coupled to each other, thus ensuring a balance between current in each LED string.
    Type: Grant
    Filed: July 4, 2011
    Date of Patent: May 12, 2015
    Assignee: Microsemi Corporation
    Inventor: Xiaoping Jin
  • Patent number: 9024538
    Abstract: A discharge lamp lighting device according to the invention can reliably light a discharge lamp, and at the same time, prevent output of unnecessary high-voltage pulses with a simple circuit configuration. The discharge lamp lighting device includes a capacitor charged with a current from a direct-current power supply, a transformer adapted to output a starting pulse between electrodes of the discharge lamp in accordance with a discharge current flowing from the capacitor, a discharge control circuit adapted to switch ON/OFF the discharge current from the capacitor to the transformer, and a timing generation section adapted to switch the discharge control circuit to ON after a voltage between both ends of the capacitor has reached a reference voltage. The timing generation section can operate in accordance with a plurality of reference voltages.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: May 5, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Osamu Saito
  • Patent number: 8901843
    Abstract: A light driving apparatus includes a first rectifying unit for receiving AC power and rectifying the AC power into DC, a switching element controlled to turn on or off by a control signal, a transforming unit having a transformer and an inductor connected to a primary side of the transformer in parallel, a second rectifying unit for rectifying a secondary side output of the transforming unit and supplying an output voltage thereof to a LED unit, and a control unit provided in the primary side to give a constant-current control function so that a secondary side output is maintained consistently. According to the present disclosure, it is possible to simplify the circuit structure of the secondary side and improve the efficiency by controlling the secondary side current at the primary side without secondary side feedback information.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: December 2, 2014
    Assignee: Dongwoon Anatech Co., Ltd.
    Inventors: Jung Ho Jin, Hyun Il Park, Ju Seong Kim
  • Patent number: 8803438
    Abstract: Aspects of the disclosure provide a circuit that includes a detection circuit and a controller. The detection circuit is configured to detect a starting of a conduction in a power supply provided via an electronic transformer. The controller is configured to control a current regulating circuit to pull a current from the electronic transformer at a pre-determined level during a time duration following the starting of the conduction, and pull the current at a reduced level according to a pre-determined profile after the time duration.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: August 12, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Pantas Sutardja, InHwan Oh, Wanfeng Zhang
  • Patent number: 8736191
    Abstract: A method includes receiving a sense signal having multiple pulses, where the sense signal is based on an output of a dimmer. The method also includes, for each of multiple sampling periods, (i) identifying at least one pulse duty cycle for at least one pulse in the sense signal during that sampling period and (ii) generating an output value identifying a duty cycle for driving one or more light emitting diodes (LEDs). The output value is based on the at least one pulse duty cycle. The method further includes filtering the output values using a filter and adjusting the filter based on a rate at which the output of the dimmer changes. The filter could be adjusted by controlling whether an additional resistor forms part of an RC filter based on a sampling state.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: May 27, 2014
    Assignee: National Semiconductor Corporation
    Inventor: Steven M. Barrow
  • Patent number: 8729827
    Abstract: A semiconductor light emitting element drive device includes: a converter circuit configured to supply a light source unit with a load current from a first-primary winding; and a current regulation circuit. The converter circuit further includes a second-secondary winding. The current regulation circuit includes a switching device (second switching device) connected in series with the second-secondary winding. In a dimming ratio of the light source unit is lower than a first ratio, the second switching device is controlled to ON and OFF so as to decrease the load current through the light source unit by a shunt of a part of the energy stored in the primary winding.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: May 20, 2014
    Assignee: Panasonic Corporation
    Inventors: Sana Esaki, Akinori Hiramatu
  • Patent number: 8723437
    Abstract: The embodiments disclosed herein describe the adjusting of filter bandwidths in a multi-loop LED dimmer control circuit based on received dimmer input signals. The bandwidth of a filter in an active loop (a loop driving an LED power circuit) is decreased to prevent signal noise and associated LED flickering. Likewise, the bandwidth of a filter in an inactive loop (a loop not driving the LED power circuit) is increased to a pre-determined maximum in order to improve response time and decrease potential overshoot or undershoot during dimmer adjustment.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: May 13, 2014
    Assignee: Dialog Semiconductor Inc.
    Inventors: Xiaoyan Wang, John William Kesterson, Clarita C. Poon, Guang Feng, Haiju Li
  • Patent number: 8710761
    Abstract: The invention relates to a circuit arrangement (20) for a piezo transformer (22) comprising a driver circuit (23), to which the piezo transformer (22) can be connected, and a current sensor (21) for the determining an incoming power signal (IM), which is subject to an incoming current (IE) flowing through the piezo transformer (22). The invention further relates to the circuit arrangement (20) of a control unit (24) for providing a control signal (ST), which is subject the incoming power signal (IM); and an oscillator (25) having an oscillator output (43) for emitting an oscillator signal (SO) to a driver signal input (44) of the driver circuit (23) subject to the control signal (ST).
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: April 29, 2014
    Assignee: AMS AG
    Inventors: Manfred Pauritsch, Peter Trattler
  • Patent number: 8680777
    Abstract: A power system for a dielectric barrier discharge system, such as used for generating ozone, can include a full bridge inverter stage and parallel resonant tank outputting a signal for powering a dielectric barrier discharge cell stack. The inverter stage is controlled using a combination of pulse width modulation (PWM) and frequency modulation (FM) to enable soft switching through all load conditions—from full load to light load. A current control loop error amplifier compensator can provide a duty cycle adjustment signal to a phase shift PWM controller chip that generates the switching signals for the inverter stage. A feedback signal is also used to adjust a clock frequency time constant of the PWM controller chip to provide the FM. In one embodiment, the feedback signal is an output of an inverting amplifier connected at an output of the current control loop error amplifier compensator.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: March 25, 2014
    Assignee: MKS Instruments, Inc.
    Inventors: Ken Tran, Xing Chen, Russell L. Newman, Franklin Lee
  • Publication number: 20140028214
    Abstract: A controller may be configured to: (i) predict based on an electronic transformer secondary signal an estimated occurrence of a high-resistance state of a trailing-edge dimmer coupled to a primary winding of an electronic transformer, wherein the high-resistance state occurs when the trailing-edge dimmer begins phase-cutting an alternating current voltage signal; (ii) operate a power converter in a trailing-edge exposure mode for a first period of time immediately prior to the estimated occurrence of the high-resistance state, such that the power converter is enabled to transfer energy from the secondary winding to the load during the trailing-edge exposure mode; and (iii) operate the power converter in a power mode for a second period of time prior to and non-contiguous with the first period of time, such that the power converter is enabled to transfer energy from the secondary winding to the load during the power mode.
    Type: Application
    Filed: September 27, 2013
    Publication date: January 30, 2014
    Applicant: Cirrus Logic, Inc.
    Inventors: Poornima Mazumdar, Michael A. Kost, Yanhui Xie, Sahil Singh
  • Patent number: 8575850
    Abstract: An apparatus is disclosed for supplying power to a luminous load. The apparatus includes a transformer having a primary winding, and a control circuit adapted to generate an alternating current through the primary winding to develop an alternating voltage. The alternating current is based on a first signal derived from the input voltage, a second signal derived from the current, and a third signal varying substantially in-phase with the input voltage. The first and second signals are used to regulate the power delivered to the load, and the third signal is used to improve the power factor. A load interface circuit is provided to generate an output voltage for the luminous load based on the alternating voltage from the transformer. An over-temperature sensor may be provided to cause a reduction in power to the load when the ambient temperature exceeds a threshold.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: November 5, 2013
    Assignee: Ace Power International, Inc.
    Inventor: Chunghang Peng
  • Patent number: 8552658
    Abstract: Apparatuses, methods, systems, and circuits for light-emitting diode (LED) control are disclosed. In one embodiment, an LED control circuit can include a first pin receiving an input voltage supply; a second pin receiving a primary signal from a primary winding of a transformer coupled to the LED; a third pin coupled to a ground supply; and logic configured to estimate an output current and/or output voltage at the LED coupled to a secondary winding of the transformer from the input voltage supply and the primary signal.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: October 8, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Wanfeng Zhang, Jianqing Lin, Shaoan Dai
  • Publication number: 20130257311
    Abstract: A power system for a dielectric barrier discharge system, such as used for generating ozone, can include a full bridge inverter stage and parallel resonant tank outputting a signal for powering a dielectric barrier discharge cell stack. The inverter stage is controlled using a combination of pulse width modulation (PWM) and frequency modulation (FM) to enable soft switching through all load conditions—from full load to light load. A current control loop error amplifier compensator can provide a duty cycle adjustment signal to a phase shift PWM controller chip that generates the switching signals for the inverter stage. A feedback signal is also used to adjust a clock frequency time constant of the PWM controller chip to provide the FM. In one embodiment, the feedback signal is an output of an inverting amplifier connected at an output of the current control loop error amplifier compensator.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 3, 2013
    Applicant: MKS INSTRUMENTS, INC.
    Inventors: KEN TRAN, XING CHEN, RUSSELL L. NEWMAN, FRANKLIN LEE
  • Publication number: 20130249427
    Abstract: A light driving apparatus includes a first rectifying unit for receiving AC power and rectifying the AC power into DC, a switching element controlled to turn on or off by a control signal, a transforming unit having a transformer and an inductor connected to a primary side of the transformer in parallel, a second rectifying unit for rectifying a secondary side output of the transforming unit and supplying an output voltage thereof to a LED unit, and a control unit provided in the primary side to give a constant-current control function so that a secondary side output is maintained consistently. According to the present disclosure, it is possible to simplify the circuit structure of the secondary side and improve the efficiency by controlling the secondary side current at the primary side without secondary side feedback information.
    Type: Application
    Filed: March 20, 2013
    Publication date: September 26, 2013
    Applicant: DONGWOON ANATECH CO., LTD.
    Inventors: JUNG HO JIN, HYUN IL PARK, JU SEONG KIM
  • Patent number: 8531125
    Abstract: A backlight assembly including: a power unit which outputs a current whose polarity is changed on a regular basis; a plurality of balancing units which is connected in parallel to the power unit; a plurality of light emitting diode (LED) modules each of which individually receives each current output by a corresponding balancing unit of the plurality of balancing units; and a driver which is connected between the plurality of balancing units and the plurality of LED modules, and forms a current route for each balancing unit included in the plurality of balancing units to balance a current supplied to two different LED modules during a single period where a polarity of a current output by the power unit is changed.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: September 10, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tae-sung Kim, Young-deok Choi, Hyo-soon Choi
  • Patent number: 8487553
    Abstract: A lighting device which lights the discharge lamp, includes: a converting circuit which converts the direct current into an alternating current; a pulse generating circuit which generates a high voltage pulse; and a trigger circuit which causes the pulse generating circuit to generate the high voltage pulse, wherein the pulse generating circuit includes a primary winding and a secondary winding and generates the high voltage pulse by increasing a current input to the secondary winding based on a current input to the primary winding, and the trigger circuit includes a high pass filter; a first capacitor which stores and discharges charges input via the high pass filter; and a third switching element which outputs an output current from a second capacitor connected in parallel to the converting circuit to the primary winding if an output voltage from the first capacitor exceeds a threshold.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: July 16, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Osamu Saito, Masahide Tsuda
  • Publication number: 20130119869
    Abstract: An apparatus is disclosed for supplying power to a luminous load. The apparatus includes a transformer having a primary winding, and a control circuit adapted to generate an alternating current through the primary winding to develop an alternating voltage. The alternating current is based on a first signal derived from the input voltage, a second signal derived from the current, and a third signal varying substantially in-phase with the input voltage. The first and second signals are used to regulate the power delivered to the load, and the third signal is used to improve the power factor. A load interface circuit is provided to generate an output voltage for the luminous load based on the alternating voltage from the transformer. An over-temperature sensor may be provided to cause a reduction in power to the load when the ambient temperature exceeds a threshold.
    Type: Application
    Filed: November 14, 2011
    Publication date: May 16, 2013
    Applicant: ACE POWER INTERNATIONAL, INC.
    Inventor: Chunghang Peng
  • Patent number: 8400072
    Abstract: The present invention discloses a light emitting device driver circuit and a method for driving a light emitting device. In the present invention, the secondary windings of a transformer provide positive and negative secondary voltages, so as to generate positive and negative output voltages. A light emitting device circuit is coupled between the positive and negative output voltages. As such, the specification to withstand high voltage for a device in the circuit is reduced.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: March 19, 2013
    Assignee: Richtek Technology Corporation, R.O.C.
    Inventors: Pei-Cheng Huang, Jing-Meng Liu, Roland Van Roy
  • Patent number: 8300853
    Abstract: An audio mixing console includes a brightness adjusting mode selection button and an adjustment subject specification button. A user operates the brightness adjusting mode selection button to set up a brightness adjusting mode, and operates the adjustment subject specification button to specify any color LED of RGB or all colors as an adjustment subject. When an LED button is operated, brightness of an LED of a color of an adjustment subject in a multicolor LED unit incorporated in the LED button is increased one step by one step. In another example, in response to an operation of a button, brightness of an LED of a color of the adjustment subject in the multicolor LED unit incorporated in a plurality of LED buttons other than this button is increased one step by one step. This work is carried out for every LED and LED button.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: October 30, 2012
    Assignee: Yamaha Corporation
    Inventor: Masaru Aiso
  • Patent number: 8294384
    Abstract: An electronic ballast is capable of realizing high frequency lighting of a discharge lamp and switching between at least two lighting modes with different light outputs. The ballast includes a preheating circuit having a winding component connected in parallel with a main resonant circuit with a lamp current flowing therein for the discharge lamp. A constant preheating current for the lamp filaments is supplied from a secondary winding of the winding component during lighting of the discharge lamp and a path of a current flowing on a primary winding side of the winding component is switched by a switch according to the lighting mode.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: October 23, 2012
    Assignee: Panasonic Corporation
    Inventor: Kenji Matsuda
  • Patent number: 8278857
    Abstract: A motor control device is electrically connected with a motor. The motor control device includes a controller and a driving circuit. The controller has a default value of time and generates a first driving signal and a second driving signal. The driving circuit includes a first switching element and a second switching element, the first switching element and the second switching element receive the first driving signal and the second driving signal respectively, and the first switching element and the second switching element are switched on or switched off alternately according to the first driving signal and the second driving signal respectively, so as to drive the motor to operate.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: October 2, 2012
    Assignee: Delta Electronics, Inc.
    Inventors: Yu-Liang Lin, Ming-Yen Lin, Chia-Wen Kuo, Kuan-Ting Lee
  • Patent number: 8274236
    Abstract: The current invention provides a power supply that includes an igniter that generates an ignition voltage for igniting a DC lamp; an auxiliary power stage that outputs an auxiliary voltage for sustaining sufficient current in the DC lamp after the DC lamp is ignited; a voltage conversion stage coupled to the auxiliary power stage and generating a voltage at a level that is higher than the auxiliary voltage; and a switch that couples the auxiliary voltage to the DC lamp and the voltage conversion stage for a predefined period of time.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: September 25, 2012
    Assignee: Delta Electronics, Inc.
    Inventors: Yuequan Hu, Milan M. Jovanović
  • Patent number: 8269433
    Abstract: A circuit arrangement for operating a discharge lamp having a dielectric layer between at least one electrode and one discharge medium, comprising a primary circuit, which comprises a flux converter with at least one electronic switch, the flux converter having a first input terminal and a second input terminal for connecting an input voltage; a secondary circuit, which has a first output terminal and a second output terminal for connecting the discharge lamp; a transformer coupling the primary circuit to the secondary circuit, the transformer having at least a primary winding, a secondary winding and a transformer core, on which the primary winding and the secondary winding are wound; and a discrete inductance with a core, the discrete inductance being coupled electrically in parallel with the secondary winding.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: September 18, 2012
    Assignee: Osram AG
    Inventors: Karl Kyrberg, Oskar Schallmoser
  • Patent number: 8258716
    Abstract: An active type multiple channeled LED power driving system which includes seven regions, wherein power is lead-in through the first region with the EMC circuitry and the PWM circuitry, passing through the second region with the transformer, entering the third region with the CC & CV control circuitry, passing through the fourth region with two multiple channeled outputers, lead-in the fifth region having two intermittent modulating circuitries, outputting to the sixth region with the two LED lighting modules, and setting with environment parameters sensors in the seventh region, thereby raising the electronic typed heat dissipation rate and energy efficiency under the system operation to let the LED lamp be able to achieve its maximum performance.
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: September 4, 2012
    Inventor: Jui Chih Yen
  • Patent number: 8247983
    Abstract: The present invention provides a lamp driving circuit. When it is used to drive a number of lamps arranged in a hybrid serial-parallel configuration, the lamp driving circuit eliminates the parasitic current in series branch circuits by using an inverse transformer, which makes the current passing each of the lamps in each of the series branch circuits consistent and consequently eliminates the imbalance of each of the lamps.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: August 21, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Zhihua Song, Paul Robert Veldman
  • Publication number: 20120200233
    Abstract: The invention relates to a circuit arrangement (20) for a piezo transformer (22) comprising a driver circuit (23), to which the piezo transformer (22) can be connected, and a current sensor (21) for the determining an incoming power signal (IM), which is subject to an incoming current (IE) flowing through the piezo transformer (22). The invention further relates to the circuit arrangement (20) of a control unit (24) for providing a control signal (ST), which is subject the incoming power signal (IM); and an oscillator (25) having an oscillator output (43) for emitting an oscillator signal (SO) to a driver signal input (44) of the driver circuit (23) subject to the control signal (ST).
    Type: Application
    Filed: December 2, 2011
    Publication date: August 9, 2012
    Applicant: austriamicrosystems AG
    Inventors: Manfred PAURITSCH, Peter TRATTLER
  • Publication number: 20120153858
    Abstract: An electronic system includes a controller to provide at least dual-mode conduction control of a switching power converter. In at least one embodiment, the controller is capable to control transitions between discontinuous conduction mode (DCM) and critical conduction mode (CRM) of the switching power converter using a measured switching time parameter having a value corresponding with an approximately peak voltage of a time-varying supply voltage supplied to the switching power converter. In at least one embodiment, the controller dynamically compensates for changing parameters of the electronic system by dynamically determining a minimum non-conductive time of the control switch of the switching power converter using the measured switching time parameter value at approximately the peak of the supply voltage of the supply voltage.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 21, 2012
    Inventors: John L. Melanson, Zhaohui He
  • Patent number: 8193723
    Abstract: An LED current-balance driving circuit for driving a plurality of LED strings comprises a feedback transformer, a plurality of current-balance transformers, a plurality of full-wave rectifiers and a current control circuit. The feedback transformer has a detecting winding and an outputting winding for outputting a feedback signal. Each of the current-balance transformers has a primary winding and a secondary winding. The primary windings of the current-balance transformers and the detecting winding of the feedback transformer are coupled in series to compose a current-balance loop with an AC power being supplied thereto. Each of the full-wave rectifiers is coupled between a corresponding secondary winding of the current balance transformers and a corresponding LED string of the LED strings. The current control circuit receives the feedback signal and controls the AC power according to the feedback signal.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: June 5, 2012
    Assignee: Top Victory Investments Ltd.
    Inventors: Shin-An Li, Chi-Hsin Li
  • Patent number: 8174203
    Abstract: A lamp driving circuit includes a first printed circuit board and a second printed circuit board. The first printed circuit board includes a switching unit for switching an input power source, a control unit for controlling the switching unit, an inverter transformer connected to the switching unit, and a voltage conversion unit for converting a feedback reference current for controlling an output current applied from the inverter transformer into a reference voltage and applying the reference voltage to the control unit. The voltage conversion unit is connected to the inverter transformer and the control unit. The voltage conversion unit is connected to a first feedback terminal. The second printed circuit board includes a plurality of balance coils connected to a plurality of lamps so that the same output currents are applied to the lamps, a second feedback terminal connected to the first feedback terminal, and a current conversion unit connected to the second feedback terminal.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: May 8, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Ju Rae Kim, Jong Rak Kim, Min Jin Kim
  • Patent number: 8148919
    Abstract: A driving circuit for powering a light-emitting diode (LED) light source includes a converter circuit, an energy storage element and a switch element. The converter circuit provides a first output voltage on a first power line to provide power to the LED light source and provides a second output voltage on a second power line that is less than the first output voltage. The energy storage element is charged and discharged to regulate a current through the LED light source. The switch element operates in a first state during which the energy storage element is charged and operates in a second state during which the energy storage element is discharged. The converter circuit provides the second output voltage to maintain an operating voltage across the switch element less than the first output voltage during both the first state and the second state.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: April 3, 2012
    Assignee: O2Micro, Inc
    Inventors: Da Liu, Yung Lin Lin
  • Patent number: 8138683
    Abstract: Disclosed is a method for controlling a series circuit current of a lighting installation at an airfield or the like, in which case the series circuit current which flows through transformers which are arranged on the secondary side of an output transformer and are connected in series, in order to supply lighting appliances is controlled by means of a thyristor module, which is arranged on the primary side of the output transformer and has a variable trigger angle, in which case, when a control unit is in a constant-current mode, the trigger angle is set in such a manner that a series circuit current which corresponds essentially to a rated output current flows. The invention also relates to a constant-current regulator for carrying out the method.
    Type: Grant
    Filed: October 9, 2006
    Date of Patent: March 20, 2012
    Assignee: ADB BVBA
    Inventors: Pierre Catoul, Daniel Tessens, Jean-Claude Vandevoorde
  • Patent number: 8115406
    Abstract: A fluorescent lamp driver circuit is provided. The fluorescent lamp driver circuit uses reversed current detecting signal to achieve feedback control and circuit protection so as to simplify the driver circuit and reduces the number of the required electronic components. The driver circuit needs a single control unit to control the whole circuit, which not only reduces cost, but also simplifies circuit design.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: February 14, 2012
    Assignee: Niko Semiconductor Co., Ltd.
    Inventors: Chen-Hsung Wang, Shu-Ming Chang
  • Patent number: 8080945
    Abstract: The present invention provides a multiple lamp driving capable of being applied to a multiple lamp system such as an LCD, wherein the multiple lamp driving device includes: a power supply unit for supplying a driving voltage to a lamp unit provided with first to 4nth lamps; and a balancing circuit unit including first to nth balance transformers for receiving the driving voltage from the power supply unit and balancing currents flowing through the first to 4nth lamps, wherein each of the first to nth balance transformers includes a primary side connected to the power supply unit in series and first and second secondary sides electrically connected to the primary side, each one end of the first and second secondary sides is connected to one end of one of the first to 4nth lamps, each of the other ends of the first and second secondary sides is connected to one end of another among the first to 4nth lamps, and the other ends of all of the first to 4nth lamps are connected to a ground.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: December 20, 2011
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Won Sik Chong, Kyoung Ho Yoon, Yoon Seok Seo, Ki Hung Nam
  • Patent number: 8072154
    Abstract: A device for supplying diodes LED includes an electric bridge (ABHG) with input terminals (A, B) and output terminals (H, G), including diodes (DS1, DS2) interposed between branches (AH, BH), with cathodes turned toward the terminal (H); Two MOSFET elements (M1, M2) are interposed between the branches (AG, BG). A capacitor (C) is derived between the terminals (H) and (G). A switch (KR) and LED diodes arranged in series, with their anodes oriented toward the terminal (H), and a first current sensor (S1) are arranged along a derived branch (R), between the terminals (H) and (G). An electric control unit (CE) receives in input feedback control signals coming from the first sensor (S1) and operates opening/closing of the switches (M1) and (M2), as well as of the branch switch (KR) in suitable relation with the trend of the alternating current (iz), to obtain a predetermined trend of the branch current (ir.) for power supplying the LED diodes.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: December 6, 2011
    Assignee: O.C.E.M. S.p.A.
    Inventor: Gianni Facchini
  • Publication number: 20110227499
    Abstract: A lamp module for being coupled with a dimmer module includes a rectifier, a voltage lowering circuit, a driving circuit, a switching circuit, a transformer, a light emitting component, and a first stabilizing circuit. The rectifier is coupled to the dimmer module and used for outputting a first DC voltage. The voltage lowering circuit is coupled to the rectifier. The driving circuit is coupled to the voltage lowering circuit. The light emitting component is coupled to the transformer. The switching circuit is coupled to the driving circuit, the first DC voltage and the transformer, and controls the brightness of the light emitting component based on the first DC voltage. The first stabilizing circuit is arranged in parallel with the voltage lowering circuit, and directly conducts the first DC voltage to the driving circuit when the first DC voltage is smaller than a first potential.
    Type: Application
    Filed: March 17, 2011
    Publication date: September 22, 2011
    Inventor: Pau-Sheng Huang
  • Patent number: 8022642
    Abstract: A discharge lamp lighting device is provided to comprise tube current detecting circuits 51 to 5n for outputting detection signals VI1 to VIn of tube currents I1 to In flowing through each discharge lamp 11 to 1n from an inverter 3 connected to DC power source 2 via a plurality of transformers 41 to 4n, a maximum detector 6 for detecting a maximum value VIMX of detected signals VI1 to VIn from current detector 51 to 5n, a minimum detector 7 for detecting a minimum value VIMN of detected signals VI1 to VIn from current detector 51 to 5n, a comparison circuit 8 for computing one or plural values of sum, difference, product and quotient between maximum value VIMX from maximum detector 6 and minimum value VIMN from minimum detector 7 to generate a cease signal VCP when the computed value exceeds a given value, and a control circuit 9 for halting operation of inverter 3 when comparison circuit 8 generates cease signal VCP.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: September 20, 2011
    Assignee: Sanken Electric Co., Ltd.
    Inventors: Toru Ashikaga, Kazushige Hirata
  • Patent number: 7982415
    Abstract: A discharge lamp lighting apparatus includes a switch circuit for DC/AC converting, a discharge lamp connected to a secondary winding of a transformer, a current detector detecting an AC output current of the discharge lamp, an error amplifier outputting an error signal to a detected current, a control circuit generating control signals that turn on/off the switching elements in such a way as to control the AC output current at a predetermined value, and a time division signal generator generating a time division signal at the start of an ON/OFF operation of the switching elements, wherein the time division signal delays a change in a burst dimming signal or has a predetermined inclination on the burst dimming signal. The error amplifier changes the error signal according to the time division signal from the time division signal generator.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: July 19, 2011
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Kengo Kimura
  • Patent number: 7912136
    Abstract: A receiver that receives a digital signal transmitted on the basis of an orthogonal frequency division multiplexing (OFDM) method. This receiver comprises a demodulation unit for demodulating the digital signal, a demapping unit for demapping demodulated data output from the demodulation unit, a frequency deinterleave unit for executing a frequency deinterleaving process on data output from the demapping unit, a delay unit for delaying control information superposed on the digital signal by a prescribed time period, and a time deinterleave unit for executing, on the basis of the interleave length specified by the control information delayed by the delay unit, a time deinterleaving process on data on which the frequency deinterleaving process has been executed.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: March 22, 2011
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Naoto Adachi
  • Publication number: 20110057575
    Abstract: A driving device includes a dimmer, a rectifying-filtering unit, a rectifying-dividing unit, a control unit, and a voltage transforming unit. The dimmer is used for receiving an alternating current (AC) voltage from a power supply, and generating a primary voltage for controlling the brightness of a luminous element. The rectifying-filtering unit is used for rectifying and filtering the primary voltage to generate a secondary voltage. The rectifying-dividing unit is used for rectifying and dividing the primary voltage to generate a detecting voltage. The control unit is used for receiving the secondary voltage, and generating a pulse voltage whose duty cycle is variable with the detecting voltage. The voltage transforming unit is used for transforming the secondary voltage to a driving voltage for driving the luminous element to emit light according to the pulse voltage. A related electronic apparatus is also provided.
    Type: Application
    Filed: July 25, 2010
    Publication date: March 10, 2011
    Applicant: FITIPOWER INTEGRATED TECHNOLOGY, INC.
    Inventors: KAI-PING LIN, CHUN-HSIN YANG, WEN-CHENG SHIH
  • Publication number: 20110050115
    Abstract: A method of igniting a gas discharge lamp (2) comprises the steps of first applying a plurality of high-voltage ignition pulses with a relatively low amplitude and subsequently applying high-voltage ignition pulses with a relatively high amplitude. Switching over from generating low-amplitude ignition pulses to generating high-amplitude ignition pulses may be done on the basis of counting the low-amplitude ignition pulses or on the basis of monitoring the duration of the period during which the low-amplitude ignition pulses are generated.
    Type: Application
    Filed: November 24, 2008
    Publication date: March 3, 2011
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Johan L.V. Hendrix, Guido De Beuckelaer, Stijn A.M. Geudens, Rene Van Honschooten, Jean-luc C.O. Massage, Guy Proth
  • Publication number: 20110031892
    Abstract: A lighting device (8), which is provided with a cold cathode fluorescent tube (light source) (9) and a chassis (8a) that houses the cold cathode fluorescent tube (9), includes an inverter circuit (16) that includes a transformer (16a) to be connected to the cold cathode fluorescent tube (9) and drives the cold cathode fluorescent tube (9). The inverter circuit (16) drives the cold cathode fluorescent tube (9) using a frequency higher than a predetermined fundamental frequency during a predetermined period within a period in which the cold cathode fluorescent tube (9) is lit.
    Type: Application
    Filed: November 5, 2008
    Publication date: February 10, 2011
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Masahiro Arai
  • Patent number: 7843138
    Abstract: In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output power transformer, the output from a full-bridge converter that operates at an output frequency in the range from ten Hz to tens of Khz to the output terminals of the power supply. A connection to a reference potential that minimizes the potential fluctuation of the cathode is provided by the center tap on an autotransformer connected across the output terminals, where the conductors in the autotransformer are sized for half of the emission current from the cathode rather than the much larger heating current.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: November 30, 2010
    Assignee: Kaufman & Robinson, Inc.
    Inventors: Steven J. Geissler, James R. Kahn, Harold R. Kaufman
  • Patent number: 7808186
    Abstract: An output of a rectifying circuit (6), which rectifies commercial AC power, is supplied to an inverter (12) through a power factor correction circuit (8). The output of the inverter (12) is voltage-transformed in a transformer (16), rectified in a rectifying circuit (18) and is applied to a xenon lamp (2). A secondary winding (22s) of a transformer (22) of an igniter (20) is connected between the rectifying circuit (18) and the xenon lamp (2) in order to generate an arc in the xenon lamp (2). A pulse generator provides a pulse for a short time period to a primary winding (22p) of the transformer (22). An auxiliary power supply (26) supplies arc-sustaining current prepared based on the commercial AC power to the junction of the rectifying circuit (18) and the secondary winding (22s) of the transformer (22).
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: October 5, 2010
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Kenzo Danjo, Takashi Tsujii, Hiroki Morimoto