For Rectifiers Patents (Class 363/52)
  • Patent number: 10729161
    Abstract: A fryer includes a potential generator; and an oil tub installed with a discharging electrode of the potential generator. The potential generator includes a transformer that is composed of a primary coil and a secondary coil; a feedback control circuit that feeds back one terminal of the secondary coil to one terminal of the primary coil to adjust a voltage of the secondary coil; an output control portion that is provided on the other terminal of the secondary coil to impart a predetermined low frequency vibration to an output of the secondary coil which causes the discharging electrode physically vibrates; and the discharging electrode that is formed of a conductive material and provided on the other terminal of the secondary coil via the output control portion. A vibration frequency of the low frequency vibration applied is 40 Hz to 60 Hz which is determined by the output control portion.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: August 4, 2020
    Inventors: Kanetaka Goto, Takayuki Kato, Kanako Kondo
  • Patent number: 10275973
    Abstract: A control unit; a banknote handling module that includes a conveying mechanism, a first control circuit, and a second control circuit that is controlled by the first control circuit and that controls the conveying mechanism; a power supply unit; a first power supply cable that supplies electrical power from the power supply unit to the first control circuit; and a second power supply cable that supplies electrical power from the power supply unit to the second control circuit. The first control circuit includes a first connecting portion to which the first power supply cable is connected and a first hot plug-in circuit that is connected to the first connecting portion. The second control circuit includes a second connecting portion to which the second power supply cable is connected and a second hot plug-in circuit that is connected to the second connecting portion.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: April 30, 2019
    Assignee: FUJITSU FRONTECH LIMITED
    Inventor: Tomoaki Ogawa
  • Patent number: 10073486
    Abstract: According to an embodiment, a device includes a power supply terminal configured to provide a power supply signal to a plurality of functional components and a power supply shaping circuit coupled to the power supply terminal. The power supply shaping circuit is configured to determine a variation signal of the power supply signal and shape changes in the power supply signal by controlling a dummy load coupled to the power supply terminal based on the variation signal.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: September 11, 2018
    Assignee: INFINEON TECHNOLOGIES AG
    Inventors: Andreas Wiesbauer, Christian Jenkner
  • Patent number: 10033266
    Abstract: A power conversion device includes: a bridge circuit; a filter provided on an alternating current side of the bridge circuit, and connected to a neutral point; a reactor between the bridge circuit and the filter; a smoothing circuit provided on a direct current side of the bridge circuit; a snubber circuit between the bridge circuit and the smoothing circuit; and a switch circuit provided between the smoothing circuit and the snubber circuit. The smoothing circuit includes two smoothing capacitors connected in series between a positive line and a negative line. The neutral point is connected between the two smoothing capacitors. The snubber circuit includes two snubber capacitors connected in series between the positive line and the negative line. The neutral point is connected between the two snubber capacitors. The switch circuit includes a first switch provided on the positive line and a second switch provided on the negative line.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: July 24, 2018
    Assignee: OMRON Corporation
    Inventors: Takashi Hyodo, Shuhei Kato
  • Patent number: 9899907
    Abstract: A switching power supply circuit includes a switching element connected to a primary winding wire of a transformer in series, capacitors connected to secondary winding wires of the transformer via diodes, and an IC for power supply control that controls ON/OFF operation of the switching element on the basis of a charged voltage of the capacitors. Commanded voltages are charged in the capacitors after electric power is supplied to a main power supply, and further, after the elapse of a delay time set in advance, a control circuit, which controls the entire apparatus, controls a main circuit and a peripheral apparatus circuit to start operations.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: February 20, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshitomo Hayashi, Yoji Tsutsumishita, Tomokazu Ogawa
  • Patent number: 9681677
    Abstract: A space potential generator includes a transformer formed by magnetically connecting a primary coil and a secondary coil, a feedback control circuit feeding back one terminal of the secondary coil to one terminal of the primary coil to adjust voltage of the secondary coil, an output control portion provided on the other terminal of the secondary coil to impart low frequency vibration to an output of the secondary coil, a static electricity discharger formed of conductive material and provided on the other terminal of the secondary coil via the output control portion, the space potential generator does not have a grounding electrode, a weak current flowing through the secondary coil is 0.002 to 0.2 A, the static electricity discharger is covered with an insulating member to discharge predetermined static electricity to surrounding space, and electric field of target voltage is formed in the surrounding space by the discharged static electricity.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: June 20, 2017
    Inventors: Kanetaka Goto, Takayuki Kato, Kanako Kondo
  • Patent number: 9335780
    Abstract: An electro-magnetic interference (EMI) filter having a boost mode amplifier integrated therewith is provided. The boost mode amplifier utilizes the filtering inductors of the EMI filter as energy storage devices to control the input voltage supplied to a DC-to-DC power converter. A controller is also provided for selectively activating the boost mode amplifier, maintaining the input voltage provided to the converter within a predetermined operating range.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: May 10, 2016
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Stanley M. Granat, Jorge-Luis B. Romeu, Russell S. Trask
  • Patent number: 9312689
    Abstract: An overload protection circuit for supplying electric power has advantageous applications especially in supplying power to capacitive loads. In prior art circuits, the charging current is lead to the capacitive load through a linearly operating transistor or through a power resistor. Therefore, prior art circuits often involve a risk of exceeding safe operating area of a power transistor, or circuits with a large number of components are needed. The present overload protection circuit has an inductor (L) coupled in series with a switching element (Q). Load current is measured (35, 38), and the switching element (Q) is controlled (35, 36) to supply current to the load via the inductor (L) until a determined current limit is achieved. After achieving the current limit the switching element (Q) is controlled to off-state, during which the freewheeling current of the inductor (L) is lead through a voltage dependent element (Z).
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: April 12, 2016
    Assignee: EFORE OYJ
    Inventor: Ilpo Nisonen
  • Patent number: 9184667
    Abstract: A switching power converter provides regulated voltage to a load. The switching power converter comprises a transformer including a first primary winding coupled to an input voltage, a second primary winding, a secondary winding coupled to an output of the switching power converter, and an auxiliary winding, a first switch coupled to the first primary winding, and a second switch coupled to the secondary primary winding. A controller generates a first control signal to turn the first switch on or off at a first switching frequency, and a second control signal to turn the second switch on or off at a second switching frequency that is higher than the first frequency. During off cycles of the switches, feedback voltage representing the output voltage of the power converter is generated across the auxiliary winding. The controller controls switching of the first switch to regulate the output voltage based on the feedback.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: November 10, 2015
    Assignee: Dialog Semiconductor Inc.
    Inventors: Fuqiang Shi, John William Kesterson, Yong Li
  • Patent number: 9107256
    Abstract: A light emitting diode (LED) lighting apparatus boosts alternating current (AC) power output from a ballast, rectifies the boosted AC power to direct current (DC) power, blocks generation of an inrush current while the boosted AC power is rectified, and controls an operation of an LED by using the DC power.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: August 11, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dae-sung Kang, Yun-whan Na, Yong-keun Jee, Seok-kyu Kim, Ki-hong Moon, Chung-hee Lee
  • Patent number: 9042130
    Abstract: Provided is a power conversion system that includes a first transformer adapted to be connected to an AC network, the first transformer including a first primary winding and two first secondary windings, and two power converters, each being connected to a first respective secondary winding. The system further includes a second transformer and a secondary electrical device, the second transformer including a second primary winding and two second secondary windings, each second secondary winding being connected to a respective first secondary winding, and the secondary device being connected to the second primary winding.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: May 26, 2015
    Assignee: GE Energy Power Conversion Technology LTD
    Inventor: Alfred Permuy
  • Patent number: 9042136
    Abstract: Embodiments provide a magnetic flux conversion device (MFCD) that may produce a regulated output signal with a target value (e.g., target voltage and/or target current) from a source signal on a power line. The MFCD may include a secondary stage configured to be inductively coupled with the power line. The source signal may cause a secondary electrical signal to flow in the secondary stage. A regulator module may be coupled to the secondary stage and configured to produce the output signal with the target value across output nodes by sensing the output signal and shunting the secondary stage if a value of the output signal is above the target value.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: May 26, 2015
    Assignee: EnGen Technologies LLC
    Inventors: George N. Osgood, Lee V. Gassaway
  • Publication number: 20150124500
    Abstract: Provided is an apparatus for controlling a surge voltage. An embodiment configures a snubber coil and a snubber rectifier on a secondary side circuit in series to control a high spike surge voltage across a rectifier on the secondary side. When the rectifier is turned-off, the snubber rectifier is turned-on for a predetermined time to control the surge voltage.
    Type: Application
    Filed: July 23, 2012
    Publication date: May 7, 2015
    Applicant: LG INNOTEK CO., LTD.
    Inventors: Zhe Li, Min Ho Kim
  • Publication number: 20150113295
    Abstract: Examples disclose a controller with a meter interface to receive a first input power measurement provided from a meter. The meter delivers input power to a rectifier which delivers power to a load. Additionally, the examples disclose the controller with a rectifier interface to receive a second input power measurement provided from the rectifier. Further, the examples disclose the controller to manage the rectifier based on the first and the second input power measurements.
    Type: Application
    Filed: July 31, 2012
    Publication date: April 23, 2015
    Inventors: David Paul Mohr, Michael G. Waters, Zachary J. Gerbozy
  • Patent number: 8988908
    Abstract: A capacitive power supply including: a first capacitive element and a first resistive element in series between a first terminal of a power switch and at least one rectifying element having a second terminal connected to a first electrode of at least one second capacitive element for providing a D.C. voltage; and a bidirectional switch in parallel on the resistor.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: March 24, 2015
    Assignee: STMicroelectronics (Tours) SAS
    Inventors: Laurent Gonthier, Antoine Passal
  • Patent number: 8976550
    Abstract: A power supply having a power protection circuit has a rectification circuit and a converter. An input terminal of the rectification circuit is connected with the AC mains. A first voltage dependent resistor is connected with the AC mains. The converter has a transformer. A primary side of the transformer is connected with an output terminal of the rectification circuit, and the secondary side is connected to a power output terminal and a ground terminal. A Y capacitor is connected between the primary side of the transformer and the ground terminal. A surge protection module is connected between the first voltage dependent resistor and the Y capacitor. When a surge occurs between the primary and secondary sides of the transformer, a surge current is shunted by the surge protection module to the ground terminal through the Y capacitor without damaging internal components or circuits inside the power supply.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: March 10, 2015
    Assignee: Cyber Power Systems Inc.
    Inventors: Chih-Wei Hsiao, Yuan-Liang Hsu
  • Publication number: 20150043256
    Abstract: A power supply system and method are disclosed. The system includes a power supply to generate an output voltage in response to a pulse-width modulation (PWM) signal and a DC main voltage. The system also includes an AC/DC converter to generate the DC main voltage based on an AC input voltage. The system further includes a power supply controller to generate the PWM signal based on feedback associated with the output voltage. The power supply controller includes a fault controller to detect an overvoltage condition associated with the power supply and to cause the AC/DC converter to disable the DC main voltage in response to the overvoltage condition.
    Type: Application
    Filed: April 20, 2012
    Publication date: February 12, 2015
    Inventor: Reynaldo P Domingo
  • Publication number: 20150023073
    Abstract: A power control device and an image forming apparatus including the same are disclosed. A power control device meets the need for low power consumption by minimizing standby power consumption in a plug-on state of an electronic apparatus, and meets the safety requirements by increasing a discharging rate of an X-cap or an E-cap in a plug-off state. The power control device includes a first capacitor charged by AC power during input of the AC power, a rectifier converting the AC power to DC power, a second capacitor disposed at an output of the rectifier, and a discharge circuit including at least one discharge resistor, and a first switch and a second switch configured to be alternately turned on/off in response to supply and interruption of the AC power, and discharging at least one of the first and second capacitors via the at least one discharge resistor, in response to turn-off of the first switch and turn-on of the second switch.
    Type: Application
    Filed: June 25, 2014
    Publication date: January 22, 2015
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Jin Ha KIM
  • Publication number: 20140328094
    Abstract: An apparatus may include a plurality of power inputs configured to receive direct current from a plurality of external power adapters that convert alternating current to direct current. The plurality of external power adapters may include a primary external power adapter and at least one backup external power adapter. The apparatus may also include a power output configured to provide direct current to a device. In addition, the apparatus may include a switching mechanism that, when the primary external power adapter is operational, supplies direct current from the primary external power adapter to the power output and, when the primary external power adapter fails, supplies direct current from the backup external power adapter to the power output. Various additional apparatuses, systems, and methods are also disclosed.
    Type: Application
    Filed: July 5, 2013
    Publication date: November 6, 2014
    Inventor: Paulo Rodrigues
  • Publication number: 20140307490
    Abstract: An overvoltage protection unit includes a power circuit module and a controller module. The power circuit module receives power from a power source on an AC input and includes a rectifier that converts voltage on the AC input into a DC Link output voltage, and an AC input current sensor that senses a current on the AC input. The controller module provides an output to terminate power from the power source based upon the DC Link output voltage and a sensed current from the AC input current sensor.
    Type: Application
    Filed: April 15, 2013
    Publication date: October 16, 2014
    Applicant: Hamilton Sundstrand Corporation
    Inventor: John Duward Sagona
  • Publication number: 20140307491
    Abstract: An offline power converter provides low EMI and quick reaction by slowly turning off a power switch at normal operation, and fast turning off the power switch when surge event happens.
    Type: Application
    Filed: April 12, 2013
    Publication date: October 16, 2014
    Applicant: MONOLITHIC POWER SYSTEMS, INC.
    Inventors: Joseph Urienza, Peng Liu
  • Patent number: 8755206
    Abstract: A converter valve unit including a plurality of parallel connected semiconducting elements, a free-wheeling diode and a control unit.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: June 17, 2014
    Assignee: ABB Research Ltd.
    Inventor: Hans Peter Nee
  • Publication number: 20140153301
    Abstract: An AC signal detector having: a rectify circuit having a first input terminal and a second input terminal configured to receive an AC signal, and an output terminal configured to provide a rectified signal based on the AC signal; a detecting circuit having an input terminal coupled to the output terminal of the rectify circuit to receive the rectified signal, and an output terminal configured to provide a square signal based on the rectified signal; and an unplug indicate circuit having an input terminal coupled to the detecting circuit to receive the square signal, and an output terminal configured to provide an unplug indicate signal based on the square signal.
    Type: Application
    Filed: June 28, 2013
    Publication date: June 5, 2014
    Inventors: Siran Wang, Yike Li, Kun Yi, Yuancheng Ren, Junming Zhang, En Li
  • Patent number: 8730689
    Abstract: A capacitive power supply including an input section having input terminals for connection to an AC-mains supply, and a capacitive coupling, a rectification section coupled via the capacitive coupling to the input terminals, and an output section coupled to the rectification section, the output section including output terminals, for providing an output voltage to a load, a first chain including a charge storage facility, and a second chain arranged in parallel to the first chain, and including an output voltage limiting facility, the capacitive power supply further including an inrush current limiting facility, wherein the output terminals are connected to respective terminals of the output voltage limiting facility, and the DC-conducting series impedance has a resistive component with a resistive value of at least 0.2 times a resistive value of the first chain.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: May 20, 2014
    Assignee: Koninklijke Philips N.V
    Inventor: Thijs De Haan
  • Publication number: 20140112033
    Abstract: A power supply apparatus is provided, in which a control chip is used to detect an AC input power, so that it is unnecessary to additionally set an external independent detection circuit, by which not only a design cost is decreased, an extra standby loss is also avoided. Moreover, the method of using the control chip to execute detection of the AC input power can effectively decrease detection deviation, so as to notify the load system within an allowable (accurate) time (i.e. the predetermined time). Moreover, the control chip can determine and adjust the predetermined time within which the indication signal is generated to notify the load system according to an application requirement of the load system, so that the power supply apparatus can be generally applied in different types of the load systems having a timing control requirement.
    Type: Application
    Filed: October 22, 2013
    Publication date: April 24, 2014
    Applicant: FSP TECHNOLOGY INC.
    Inventor: Yen-Chun Lin
  • Patent number: 8692501
    Abstract: A shunt regulated permanent magnet alternator voltage source includes a permanent magnet alternator, a shunt regulator, and a pulse width modulation controller. Also included is a load controller capable of detecting a PMA margin.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: April 8, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gary L. Hess, James A. Gosse, Steven A. Avritch
  • Patent number: 8687389
    Abstract: A device has a converter which is connected to a direct voltage circuit through a short-circuit protection unit. The short-circuit protection unit is arranged at least partially in the direct voltage circuit and is provided in the direct voltage circuit to suppress short-circuit current flowing through the converter. The device contains one or more controllable power semiconductors, wherein a protection element is arranged in parallel to at least one of the controllable power semiconductors. The device prevents the negative effects of a short circuit occurring in the direct voltage network in a particularly reliable manner. For this purpose, the protection element is an energy store.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: April 1, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Mike Dommaschk, Jörg Dorn, Ingo Euler, Franz Karlecik-Maier, Jörg Lang, Quoc-Buu Tu, Carsten Wittstock, Klaus Würflinger
  • Publication number: 20140085947
    Abstract: An off-line power converter includes an integrated circuit power factor controller including a multi-function input terminal, a drive terminal for providing a drive signal to a gate of a drive transistor, a processing circuit coupled to the multi-function input terminal and, based on a signal received from the multi-function input terminal, providing at least one current signal representative of a current conducted in the off-line power converter, and at least one voltage signal representative of a voltage provided to a load, and a controller for providing the drive signal selectively in response to the at least one current signal and the at least one voltage signal.
    Type: Application
    Filed: September 27, 2012
    Publication date: March 27, 2014
    Inventors: Jose M. Capilla, Joel Turchi
  • Patent number: 8638536
    Abstract: A printed circuit board includes a primary region, a secondary region and an isolation region disposed between the primary region and the secondary region to galvanically isolate the primary region from the secondary region. The primary region is to be coupled to an AC source. The primary region also includes an electrostatic discharge (ESD) conducting pathway to redirect current to the AC source that crosses the isolation region. A spark gap is included in the ESD conducting pathway.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: January 28, 2014
    Assignee: Power Integrations, Inc.
    Inventor: John Allen Carpenter
  • Patent number: 8634215
    Abstract: A rectifier circuit with a synchronously controlled semiconductor element. The rectifier circuit includes at least one field effect transistor with a control electrode and two switching electrodes. The control electrode operates the reverse state and the forward state between the switching electrodes. At least one driver, which cooperates with a voltage sensor of the field effect transistor, controls this to the forward state during the diode operating state of the field effect transistor. The voltage sensor includes a sensor output capacitance that forms a non-linear voltage divider with an external reference capacitance.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: January 21, 2014
    Assignee: Infineon Technologies Austria AG
    Inventor: Gerald Deboy
  • Patent number: 8593101
    Abstract: A power converting device is disclosed that can reduce switching loss occurring in a voltage source inverter that drives an AC motor. It is possible to supply DC power to the voltage source inverter from both a voltage source rectifier, which converts AC power from an AC generator into DC power, and a battery. A first switching circuit is inserted between the voltage source rectifier and the AC generator, and the battery is connected to the output side of the voltage source rectifier. A second switching circuit is inserted between the battery and the voltage source inverter. A third switching circuit and a reactor are inserted in series between the input side of the voltage source inverter and the input side of the voltage source rectifier. At least one of an upper arm and a lower arm of the voltage source rectifier can be chopper controlled.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: November 26, 2013
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Michio Iwahori
  • Publication number: 20130301319
    Abstract: A power source circuit includes a switching circuit 4 that converts a direct current voltage obtained by converting an alternating voltage from an alternating power source input through a pair of power supply lines 2 and 3 into a predetermined direct current voltage by a switching operation. A fuse 5 is provided on one power supply line 2. A series circuit 9 including a first line bypass capacitor 7 and a resistor element 8 is connected between one power supply line 2 and a ground 6. A second line bypass capacitor 10 is connected between the other power supply line 3 and the ground 6. Imbalance of the circuit by an excess current protection element is prevented to reduce common mode noise.
    Type: Application
    Filed: January 24, 2012
    Publication date: November 14, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Ide, Daishiro Sekijima
  • Patent number: 8570777
    Abstract: A power supply circuit includes a pulse width modulation (PWM) chip, a number of phase circuits, a voltage output end, and a spike suppression circuit. The spike suppression circuit is connected to each of the phase circuits and the voltage output end. The PWM chip controls all of the phase circuits to alternately output power supply voltages according to a predetermined sequence. The spike suppression circuit receives the power supply voltages, and filters out voltage spikes in the power supply voltages, thereby outputting steady voltages to the voltage output end.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: October 29, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Qi-Yan Luo, Song-Lin Tong, Peng Chen
  • Patent number: 8520418
    Abstract: A power source circuit which includes input portions, a limiting resistor connected to one of the input portions, a rectifier connected to the limiting resistor, a sampling resistor connected to the rectifier, output portions connected to the rectifier, a control circuit, and a switch circuit connected to the control circuit. The control circuit is connected to the two ends of the sampling resistor and the switch circuit is connected to the two ends of the limiting resistor. The control circuit is configured to output a first signal to the switch circuit if the current in the sampling resistor is greater than a predetermined value. The predetermined value is less than the level of current being consumed by a load in normal operation. The switch circuit is configured to isolate the sampling resistor when the first signal is received.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: August 27, 2013
    Assignees: Hong Fu Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Xiao-Feng Cao, Hui Li
  • Patent number: 8503201
    Abstract: Systems and methods of operating a voltage converter are provided. The converter includes an output inductor and an output capacitor coupled to a rectifier circuit. The converter also includes a clamp circuit having a clamping diode and a clamping capacitor coupled in series, with the serial combination in parallel with the output inductor. The clamp circuit can also include a recovery inductor coupled to the output capacitor, and a switch configured to selectively couple and decouple the recovery inductor in parallel with the clamping capacitor.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: August 6, 2013
    Assignee: Schneider Electric IT Corporation
    Inventor: David E. Reilly
  • Publication number: 20130194841
    Abstract: This invention is directed to a power supply apparatus and a printing apparatus, which have a function of easily relaxing an output voltage rise caused by an abrupt decrease in load current by a simple arrangement. In an embodiment of the invention, a dummy load is connected to some of power supply circuits included in the power supply apparatus. When an input voltage from a DC power supply falls below a predetermined threshold value, a power supply from the power supply circuit to an integrated circuit to which an electric power is supplied is stopped in synchronism with a reset signal output to the integrated circuit. At this time, an electric power from the power supply circuit is partially supplied to the dummy load, thereby relaxing an abrupt variation of the output voltage.
    Type: Application
    Filed: January 16, 2013
    Publication date: August 1, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Canon Kabushiki Kaisha
  • Publication number: 20130176755
    Abstract: This document discloses, among other things, apparatus and methods for dimmer control. In an apparatus example, a circuit can include an input configured to receive a control signal, a controller configured to modulate a pulse width of a pulse train using the control signal when the controller is enabled, an output configured to provide the pulse train to a driver, and first and second current limit detectors configured to receive load current information of the driver and to terminate an active pulse of the controller when a value of the load current information exceeds a threshold.
    Type: Application
    Filed: January 10, 2013
    Publication date: July 11, 2013
    Applicant: Fairchild Semiconductor Corporation
    Inventor: Fairchild Semiconductor Corporation
  • Patent number: 8482945
    Abstract: A power converter stabilizes a voltage by controlling leading of an AC current and performs maximum charging within contracted power reception amount when connected to a weak power system. The power converter comprises Magnetic Energy Recovery Switch comprising a bridge circuit including at least two reverse conductive type semiconductor switches and a magnetic energy accumulating capacitor with a small capacity connected between DC terminals of the bridge circuit. The power converter uses the Magnetic Energy Recovery Switch to perform power conversion from AC to DC or vise versa. Plurality of secondary battery charging devices each comprising the power converter have a DC part connected to a common DC bus bar, so that power is accommodated among the secondary battery charging devices.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: July 9, 2013
    Assignee: MERSTech, Inc.
    Inventor: Naoto Kojima
  • Publication number: 20130155733
    Abstract: Methods and apparatuses are disclosed for monitoring an ac input for fault conditions. The ac input may be monitored by a latch-reset that uses the ac input to charge a line detection capacitor. The latch-reset may be configured such that the voltage at one end of the line detection capacitor drops below a line detection threshold voltage when the ac input is removed for longer than an allowable period of time or if the voltage of the ac input falls below an acceptable value. The drop in voltage at the end of the capacitor may cause an electrically coupled transistor to switch, thereby causing a reset-signal to be generated.
    Type: Application
    Filed: December 20, 2011
    Publication date: June 20, 2013
    Applicant: Power Integrations, Inc.
    Inventor: Robert Mayell
  • Patent number: 8400797
    Abstract: A power conversion system with zero-voltage start-up mechanism and a zero-voltage start-up device are disclosed. The system includes a power conversion circuit, a power factor correction unit, a storage capacitor, a storage switching unit, and a zero-voltage detection module. The storage switching unit is serially connected with the storage capacitor, and particularly controlled by the zero-voltage detection module. The zero-voltage detection module detects a timing as an input voltage is at low level, and then outputs a control signal to turn on the storage switching unit. Therefore, the present invention assures that the power conversion system is turned on when the input voltage is at the low level, in order to suppress the system from a surge current.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: March 19, 2013
    Assignee: Lien Chang Electronic Enterprise Co., Ltd.
    Inventors: Chun-Kong Chan, Hsi-Yuan Tsai
  • Publication number: 20130063989
    Abstract: An interface arrangement for connection between an AC system and a DC system and to a method of disconnecting a DC system from an AC system are disclosed. The arrangement includes a converter for conversion between AC and DC having a DC side for connection to the DC system and an AC side for being coupled to the AC system, a set of circuit breakers coupled between the AC side of the converter and the AC system and a breaker assisting unit including a set of branches connected between the AC side of the converter and ground, where each branch includes a switch in series with an impedance element.
    Type: Application
    Filed: June 1, 2010
    Publication date: March 14, 2013
    Applicant: ABB TECHNOLOGY AG
    Inventors: Ying Jiang-Häfner, Baoliang Sheng
  • Publication number: 20130044523
    Abstract: A power supply having a power protection circuit has a rectification circuit and a converter. An input terminal of the rectification circuit is connected with the AC mains. A first voltage dependent resistor is connected with the AC mains. The converter has a transformer. A primary side of the transformer is connected with an output terminal of the rectification circuit, and the secondary side is connected to a power output terminal and a ground terminal. A Y capacitor is connected between the primary side of the transformer and the ground terminal. A surge protection module is connected between the first voltage dependent resistor and the Y capacitor. When a surge occurs between the primary and secondary sides of the transformer, a surge current is shunted by the surge protection module to the ground terminal through the Y capacitor without damaging internal components or circuits inside the power supply.
    Type: Application
    Filed: August 18, 2011
    Publication date: February 21, 2013
    Inventors: Chih-Wei Hsiao, Yuan-Liang Hsu
  • Patent number: 8369118
    Abstract: A current-driven synchronous rectifying drive circuit designed for a T-type voltage doubler rectifier with an energy feedback circuit including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, an output capacitor, a first and a second synchronous rectifier, and a first drive circuit connected to the first synchronous rectifier and a second drive circuit connected to the second synchronous rectifier.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: February 5, 2013
    Assignee: Inventronics (Hangzhou), Inc.
    Inventors: Xinke Wu, Delai Jiang, Xiaojun Guo, Guichao Hua
  • Patent number: 8369114
    Abstract: A power supply employs an error detecting circuit to output an error signal when detecting an overvoltage or overcurrent occurred in one of output powers and employs a latch trigger circuit to cause the power supply to enter a latch mode when receiving the error signal. The power supply will keep the latch mode when entering the latch mode until the AC power VAC is removed. In addition, the power supply employs the error detecting circuit to provide the accurate safety threshold value by the constant current source with temperature compensation function and stable constant current output.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: February 5, 2013
    Assignee: Top Victory Investments Ltd.
    Inventors: Li-Wei Lin, Kuo-Liang Huang, Chun-Tso Yi
  • Publication number: 20130016541
    Abstract: The present invention relates to an AC/DC converter station for interconnection of a DC transmission line and an AC network, the AC/DC converter station including an AC/DC converter and a control system configured to control the AC/DC converter. The AC/DC converter station comprises a capacitor connected in series between the AC/DC converter and the AC network, and a voltage measurement device arranged to measure the voltage across the capacitor. The AC/DC converter further comprises a control system connected to the voltage measurement device and arranged to receive, from the voltage measurement device, a signal indicative of a measured voltage. The control system is arranged to perform the control of the AC/DC converter in dependence of the signal received from the voltage measurement device. The invention further relates to a method of operating an AC/DC converter station.
    Type: Application
    Filed: March 4, 2010
    Publication date: January 17, 2013
    Applicant: ABB RESEARCH LTD
    Inventors: Staffan Norrga, Tomas U Jonsson, Anshuman Shukla
  • Patent number: 8351226
    Abstract: An object of the present invention is to provide a rectifier circuit which can suppress loss of power due to parasitic capacitance or parasitic inductance of a semiconductor element. The rectifier circuit matches or mismatches impedance between a circuit of a previous stage and the rectifier circuit in accordance with the amplitude of an input AC voltage. When an AC voltage to be input has a smaller amplitude than a predetermined voltage, impedance is matched and the AC voltage is applied as is to the rectifier circuit. Conversely, when an AC voltage to be input has a larger amplitude than a predetermined voltage, impedance is mismatched, and the amplitude of the AC voltage is decreased by reflection and then the AC voltage is applied to the rectifier circuit.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: January 8, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Takeshi Osada
  • Patent number: 8322864
    Abstract: A projection system incorporating a prism with dual total internal reflection function, to increase the performance of DLP™ projection, by offering a solution to combine 2 light paths to contribute to the brightness on the screen and at the same time rejecting flat-state and off-state light from entering the projection lens thereby enhancing contrast. In one implementation those two light paths can be collecting light from 2 different light sources which are driven in a pulsed manner with a duty cycle of approximately 50% for each of the two light sources at increased power. In a second implementation with a color sequential single DMD™ projector, while one light path passes a primary color the second light path passes the complementary secondary color. A special color transformation algorithm is proposed to transform the image input signals to make optimal use of the capabilities offered by the second implementation, and create maximum brightness and color saturation of the image.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: December 4, 2012
    Assignee: Barco N.V.
    Inventor: Dirk L. A. Maes
  • Patent number: 8300436
    Abstract: A power factor correction (PFC) protection device used when an abnormal current of a three-phase inverter occurs and a method of controlling the same are disclosed. If any mis-connection (or non-connection) occurs due to a mistake of a producer at a power-supply input terminal applied to the reactor and the switching element, a current applied to the switching element becomes an abnormal current, such that the PFC cannot be controlled. During the PFC control, the device detects a current waveform generated from the switching element at a current sensor of the common potential terminal, and determines whether there is a mis-connection caused by the abnormal current. If the mis-connection is decided, the device compares a current pattern with a mis-connection pattern, and changes the PFC control output applied to the switching element according to the searched mis-connection pattern, such that the PFC control can be normally carried out.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: October 30, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong Hun Ha, Ho Gul Song
  • Patent number: 8289736
    Abstract: An electric power transmission system includes at each end of a high voltage direct current transmission line including three conductors, a converter station for conversion of an alternating voltage into a direct voltage for transmitting direct current between the stations in all three conductors. Each station has a voltage source converter and an extra phase leg connected between the two pole conductors of the direct voltage side of the converter. A third of the conductors is connected to a midpoint between current valves of the extra phase leg. An arrangement is adapted to control the current valves of the extra phase leg to switch for connecting the third conductor either to the first pole conductor or the second pole conductor for utilizing the third conductor for conducting current between the stations.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: October 16, 2012
    Assignee: ABB Technology Ltd.
    Inventor: Gunnar Asplund
  • Patent number: 8233296
    Abstract: A front-end circuit of a power converter has a power connection wiring detecting circuit, a power switch and a control unit. The power connection wiring detecting circuit is connected to an AC power. The control unit is connected to the power connection wiring detecting circuit. The power switch is connected to the power loop. The control unit turns on or off the AC power loop through the power switch. When the power connection wiring is correctly connected with the AC power, the control unit turns on the power switch and the front-end circuit outputs the AC power to the back-end circuit. When the power connection wiring is incorrectly connected with the AC power, the control unit turns off the power switch and the AC power is not outputted to the back-end circuit.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: July 31, 2012
    Assignee: Cyber Power System Inc.
    Inventors: Yuan-Liang Hsu, Han-Yang Huang, Chih-Wei Hsiao