Current Limiting Patents (Class 361/93.9)
  • Patent number: 10424437
    Abstract: A Fault Current Limiter (FCL) comprising a magnetisable limb, an electrically conductive coil associated with the magnetisable limb and arranged to induce a field in the limb member and magnets spaced such that the coil is positioned intermediate the spaced magnets. Magnetisable shield elements are positioned at either end of the coil.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: September 24, 2019
    Assignee: Faultcurrent Limited
    Inventors: Andrew Cheer, Jeremy Hall
  • Patent number: 10424918
    Abstract: A fault current limiter, including: an inductor, a direct current circuit breaker, a shunt resistor, and a first fixed resistor. The inductor includes wound superconducting wires. The direct current circuit breaker and the inductor are connected in series to form a series branch. The shunt resistor is connected in parallel to the series branch. The first fixed resistor is connected in parallel to the direct current circuit breaker.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: September 24, 2019
    Assignee: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Li Ren, Siyuan Liang, Yuejin Tang, Ying Xu, Zhong Xia, Zuoshuai Wang, Jing Shi, Jingdong Li, Lihui Zhang, Sinian Yan, Zhangwei Yang, Yi Zhang
  • Patent number: 10373784
    Abstract: A superconducting arcing induction type DC circuit breaker includes a superconducting fault current limiter and an arcing induction type DC circuit breaker connected in series to each other. The arcing induction type DC circuit breaker includes an induction member that has a through-hole, is continuously formed in a 360-degree direction, and has a certain shape and thickness, and an induction needle that protrudes from an inner surface of the induction member toward a center of the induction member. A contact point where an anode and a cathode, which are mechanical contacts, approach from opposite directions and come into contact with each other is formed in the through-hole of the induction member, and the anode and the cathode are separated in a direction far away from each other.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: August 6, 2019
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, CHOSUN UNIVERSITY
    Inventors: Hyo-Sang Choi, Sang-Yong Park, In-Sung Jeong, Hye-Won Choi, Jun-Beom Kim, Yu-Kyeong Lee, No-A Park, Sun-Ho Hwang
  • Patent number: 10366987
    Abstract: Described example embodiments include an integrated circuit having a first channel area with a first FET formed in a semiconductor substrate, the substrate providing a contact to the drain. A second channel area includes a second FET formed in the semiconductor substrate. A pilot FET couples to the first FET in a current mirror configuration. A third FET has a conductivity opposite the first and second FETs and couples to the source of the pilot FET. An op amp includes an output coupled to the gate of the third FET. Signals from the drain of the second FET and the source of the pilot FET couple to the inverting input of the op amp. Signals from the source of the first FET and the drain of the first FET couple to the non-inverting input of the op amp. Methods and additional apparatus are disclosed.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: July 30, 2019
    Assignee: Texas Instruments Incorporated
    Inventors: David J. Baldwin, Hector X. Roman, Md. Abidur Rahman
  • Patent number: 10357144
    Abstract: A switching circuit includes a first switch and a second switch respectively connecting a first terminal and a second terminal of an electrical coil to a positive terminal of a voltage source, a third switch and a fourth switch respectively connecting the first terminal and the second terminal of the electrical coil to a negative terminal of the voltage source, and a controller to control the switching circuit in a current control mode to alternate a voltage polarity of the voltage source to thereby control a magnitude and direction of the electrical current of the electrical coil, and to control the switching circuit in a current hold mode to disconnect the electrical coil from the voltage source and to short-circuit the electrical coil to maintain the magnitude and direction of the electrical current at the transition time when the switching circuit switched to the current hold mode.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: July 23, 2019
    Assignee: GIVEN IMAGING LTD.
    Inventors: Semion Khait, Abraham Roth
  • Patent number: 10310003
    Abstract: This application relates to methods and apparatus for fault protection in a DC power transmission network or grid that aid in determining the location of a fault in the network. The method involves, in the event of a fault, controlling at least one current limiting element of the network so as to limit a fault current flowing to below a first current level which is within the expected current operating range of the network in normal operation, i.e. a safe level. The fault current is then controlled to maintain a non-zero level of fault current flow and the characteristics of the fault current flow at different parts of the network are determined by fault current detection modules. The location of the fault is then determined based on the determined characteristics.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: June 4, 2019
    Assignee: General Electric Technology GmbH
    Inventors: Colin Davidson, David Reginald Trainer, Carl Barker, Oleg Bagleybter
  • Patent number: 10298147
    Abstract: A power device includes a semiconductor relay and a pre-charger that has a reference voltage generator and a controller. The semiconductor relay is disposed at a position between a battery supplying electric power to a power converter that serves as a load and a smoothing capacitor connected on a battery side of the power converter in parallel with the power converter. The reference voltage generator generates a reference voltage having a gradually-increasing voltage value in a pre-charge period, prior to a turning ON of the semiconductor relay accompanying a turning ON of an ignition switch. The controller controls the semiconductor relay such that a charge voltage which is an inter-terminal voltage of the smoothing capacitor is set to a preset value according to the reference voltage.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: May 21, 2019
    Assignee: DENSO CORPORATION
    Inventor: Takashi Imura
  • Patent number: 10281946
    Abstract: A bandgap voltage reference is provided in quasi-parallel with a resistor in the input path of a digital input circuit. Because of the quasi-parallel nature, the current used by the digital input circuit is limited to an amount based on the value of the external resistor. The input current is split between circuitry used to provide the logic signal across the selected isolation barrier and a sink transistor so that the current remains constant. This allows the digital input circuit to accurately limit input current without needing field-side power.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: May 7, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Shailendra Kumar Baranwal, Anant Shankar Kamath
  • Patent number: 10244596
    Abstract: Disclosed are a light emitting diode (LED) driver circuit having improved flicker performance and an alternating current-driving type LED lighting device including the same. The LED driver circuit can remove an LED off period using a charging and discharging circuit during a compensation period so as to reduce light output deviation of an LED lighting device, and provide a driving voltage to another element of the LED lighting device, using the charging and discharging circuit during an additional discharging period so as to simultaneously improve power efficiency.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: March 26, 2019
    Assignee: Seoul Semiconductor Co., Ltd.
    Inventors: Sung Ho Jin, Sang Wook Han, Young Do Jung, Hyung Jin Lee
  • Patent number: 10007283
    Abstract: Provided is a voltage regulator capable of suppressing fluctuation in a limited current. The voltage regulator includes: a first differential amplifier circuit configured to compare a voltage based on an output voltage and a reference voltage to each other, to thereby output a first voltage; a second differential amplifier circuit configured to compare the first voltage and a second voltage to each other, to thereby output a third voltage; a first transistor configured to receive the third voltage at a gate thereof such that the output voltage is generated at a drain thereof; a second transistor, which includes a gate connected in common to the gate of the first transistor and has a predetermined size ratio to the first transistor; and a voltage generating unit, which includes one end connected to a drain of the second transistor and is configured to generate the second voltage at the one end.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: June 26, 2018
    Assignee: ABLIC INC.
    Inventors: Kosuke Takada, Masayuki Uno
  • Patent number: 9985431
    Abstract: Embodiments are directed to a current limiter having an inrush limiting stage and a discharge limiting stage. The inrush limiting stage is communicatively coupled in series with the discharge limiting stage. The inrush limiting stage is configured to receive a first input current in a first direction, perform an inrush limiting operation on the first input current and pass an inrush limited output current in the first direction to the discharge limiting stage. The discharge limiting stage is configured to pass the inrush limited output current substantially unchanged in the first direction. The discharge limiting stage is further configured to receive a second input current in a second direction, perform a discharge limiting operation on the second input current and pass a discharge limited output current in the second direction to the inrush limiting stage. The inrush limiting stage is further configured to pass the discharge limited output current substantially unchanged in the second direction.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: May 29, 2018
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Scott C. Wohlfarth
  • Patent number: 9977443
    Abstract: A low dropout linear regulator, a starting method, an electronic device, and a chip are provided. Wherein the low dropout linear regulator comprises an error amplifier circuit, an over current circuit and an over-current adjustor, the starting method includes: beginning a soft-starting process of the low dropout linear regulator and turning on a first transistor and a second transistor to provide a over current to raise an output voltage of the low dropout linear regulator; maintaining the ‘turn on’ state of the first transistor and the second transistor and decreasing the over current according to a signal obtained from the error amplifier circuit after the output voltage of the low dropout linear regulator reaches a starting voltage of the error amplifier circuit; wherein the error amplifier circuit begins to operate when the output voltage of the low dropout linear regulator reaches the starting voltage of the error amplifier circuit.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: May 22, 2018
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Jun-Yan Guo, Hong-Sing Kao
  • Patent number: 9948084
    Abstract: Disclosed embodiments relate to a DC circuit breaker and a circuit breaking method thereof which comprises: a measuring portion for measuring a DC current conducted through a first circuit portion; the first circuit portion for conducting and blocking the DC current; and a second circuit portion for conducting and blocking the DC current which is bypassed from the first circuit portion and controlling the open/close operation of the first circuit portion according to a measuring result of the measuring portion, wherein, in the first circuit portion and the second circuit portion, switching elements, which are included in each of them, are connected in a parallel configuration such that a high switching operation during a blocking operation can be improved and the DC current can be blocked in a safer and more efficient manner, and a circuit breaking method of the DC circuit breaker.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: April 17, 2018
    Assignee: LSIS CO., LTD.
    Inventor: Jung-Wook Sim
  • Patent number: 9946292
    Abstract: A power supply circuit includes a N-channel switching element having a drain connected to an input terminal and a source connected to an output terminal, and a P-channel switching element having a drain connected to the output terminal and a source connected to the input terminal. A voltage detection circuit is connected to the input terminal and configured to detect a level of an input voltage supplied at the input terminal. A voltage boosting circuit is configured to boost the input voltage and supply a boosted voltage to a gate of the N-channel switching element. A control circuit is configured to control the N-channel switching element, the P-channel switching element, and the voltage boosting circuit based on the level of the input voltage detected by the voltage detection circuit.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: April 17, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Satoshi Wakimoto
  • Patent number: 9927828
    Abstract: According to an embodiment, a voltage regulator includes a linear voltage regulator (LVR) and a transient feedback circuit. The LVR a primary feedback loop, an input terminal configured to receive an input voltage, and an output terminal configured to output a regulated voltage. The transient feedback circuit is coupled to the output terminal and the primary feedback loop, and is configured to provide a first current with a first polarity to the primary feedback loop when current flowing through the output terminal is increasing.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: March 27, 2018
    Assignee: STMicroelectronics International N.V.
    Inventors: Hemant Shukla, SaurabhKumar Singh, Nitin Bansal
  • Patent number: 9912254
    Abstract: A power delivery system includes a rotary transformer having a primary winding and a secondary winding and configured to transfer power between stationary coupling elements on a stationary side and rotational coupling elements on a rotational side. The rotational coupling elements share a central axis with the stationary coupling elements, and are adapted to rotate with respect to the stationary coupling elements. The power delivery system includes an isolation transformer that drives the primary winding of the rotary transformer, and a plurality of power inverter stages whose outputs are adapted to be summed and coupled to the rotary transformer. A plurality of output power converters receive transmitted power from the rotary transformer. A plurality of control elements, disposed on the rotating side, are configured to close a feedback loop on desired and actual performance of the output power converters, and to control the power inverter stages.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: March 6, 2018
    Assignee: Analogic Corporation
    Inventor: Adrian Delforge
  • Patent number: 9853444
    Abstract: A method of controlling the inrush current to a hot plug device. The method includes directing current from an input power rail of the hot plug device to an output power rail of the hot plug device through a high impedance auxiliary current path, wherein an electronic subsystem of the hot plug device is coupled to the output power rail. The method further includes allowing current from the input power rail to pass through a plurality of main turn on FETs to the output power rail in response to the output power rail having a voltage that exceeds a voltage threshold as a result of directing current through the high impedance auxiliary current path.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: December 26, 2017
    Assignee: International Business Machines Corporation
    Inventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
  • Patent number: 9832836
    Abstract: Various embodiments may relate to a drive circuit for an illuminating device and an illuminating device including the drive circuit. The drive circuit includes a main control unit, configured to control power supply to a light-emitting unit, an output unit, connected with the main control unit and comprising a first output terminal and a second output terminal which supply power to the light-emitting unit, and a detecting unit, connected with the output unit for detecting a hot-plug state to obtain a detecting state, wherein the main control unit controls the power supply to the light-emitting unit according to the detecting state.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: November 28, 2017
    Assignee: OSRAM GmbH
    Inventors: XiHe Zhuang, Ningbo Kang, ZhiJian Cao
  • Patent number: 9780557
    Abstract: An electrical apparatus (10) comprises: first and second terminals (18,20) for connection to an electrical circuit; a chain-link converter (22) connected between the first and second terminals (18,20), the chain-link converter (22) including a plurality of chain-link modules (24), each chain-link module (24) including at least one switching element (26) and at least one energy storage device (28), the or each switching element (26) and the or each energy storage device (28) of each chain-link module (24) combining to selectively provide a voltage source; and a protection device (32) connected across an electrical block (34) that includes at least two of the plurality of chain-link modules (24), the protection device (32) including a plurality of series-connected semiconductor devices (36), wherein the protection device (32) selectively provides a current-conductive path to allow at least part of a current flowing in the electrical apparatus (10) to bypass the electrical block (34).
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: October 3, 2017
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Colin Charnock Davidson, Robert Whitehouse
  • Patent number: 9608514
    Abstract: Embodiments relate to a diode circuit which uses a Schottky diode. A parallel bypass branch has a switch and bypass diode in series. The operation of the switch is dependent on the voltage across the Schottky diode so that the bypass function is only effective when a desired voltage is reached. The diode circuit can be used as a replacement for a single diode, and provides bypass current protection preferably without requiring any external control input.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: March 28, 2017
    Assignee: NXP B.V.
    Inventors: Henricus Cornelis Johannes Buthker, Matthias Rose, Philip Rutter, Jan Sonsky
  • Patent number: 9565729
    Abstract: Various embodiments may relate to a dimming drive circuit for an illumination apparatus and an illumination apparatus including the dimming drive circuit, wherein the dimming drive circuit includes a filter circuit unit and a bleeder circuit unit, a main control module connected to the filter circuit unit and the bleeder circuit unit, respectively, and an auxiliary control module configured to reduce the current of the bleeder circuit unit and/or to switch off the bleeder circuit unit according to a characteristic input current of the dimming drive circuit prior to switch-off of the bleeder circuit unit by the main control module in a first operation state of the dimming drive circuit, and to prevent the filter circuit unit from releasing electrical energy via the bleeder circuit unit in a second operation state of the dimming drive circuit.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: February 7, 2017
    Assignee: OSRAM GMBH
    Inventors: Haibin Xiao, YuLei Dong
  • Patent number: 9389671
    Abstract: The present invention provides a power control device, a machine comprising the same and a power control method. The device is used for an integrated machine comprising a thin client and a display and comprises: a current detecting unit for detecting the current flowing through a port in the thin client connecting to the peripheral device; and a control signal generating unit for generating a control signal based on the intensity of the detected current to adjust the power consumption of the display and/or the thin client to maintain no increase in the power consumption of the integrated machine. The power control device, the machine comprising the same and the power control method of the present invention can be used to avoid low efficiency resulting from the power reservations for peripheral devices connected by a USB port.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: July 12, 2016
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Guanglei Du, Fedja Kecman, Shannon L. Siefken
  • Patent number: 9348350
    Abstract: Provided is a voltage regulator including an overcurrent protection circuit in which an output voltage-output current characteristic exhibits an optimal fold-back characteristic even when an overcurrent state is detected. The overcurrent protection circuit includes a control circuit for generating a current in accordance with an output voltage, and controls a gate of an output transistor with use of a current obtained by subtracting the current from a sense current flowing in accordance with an output current.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: May 24, 2016
    Assignee: SII SEMICONDUCTOR CORPORATION
    Inventor: Fumimasa Azuma
  • Patent number: 9337640
    Abstract: A voltage measurement is made between two points in a circuit. If the measured voltage exceeds a predetermined amount, a switch is operated to electrically connect the two points.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: May 10, 2016
    Assignee: CONTROL TECHNIQUES LIMITED
    Inventor: Frank Weiner Heerdt
  • Patent number: 9302671
    Abstract: A control device for a vehicle includes a relay adapted to switch whether a first battery electrically connected to a motor generator and a second battery electrically connected to an electric load of the vehicle are to be electrically connected or not by turning on/off the relay. The relay is turned off during a power operation of the motor generator to disconnect an electric connection between the first battery and the second battery. The relay is turned on during a regenerative operation of the motor generator to electrically connect the first battery and the second battery. In a case where an on-fixation failure of the relay is detected, the power operation of the motor generator is prohibited.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: April 5, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventor: Takehiko Yamazaki
  • Patent number: 9263971
    Abstract: Systems and methods are disclosed with multiple direct current (DC) voltage source inverters to supply power to an alternating current (AC) power system.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: February 16, 2016
    Assignee: EMPOWER MICRO SYSTEMS INC.
    Inventors: Milan Ilic, Mika Nuotio
  • Patent number: 9236760
    Abstract: An AC-DC converter converts an alternating-current voltage, supplied from an external power supply, to a direct-current voltage higher than a peak voltage of the alternating-current voltage, and outputs the direct-current voltage to a first power supply line. In a normal control mode, a DC-DC converter steps down a voltage of the power supply line through on/off control over a switching element to charge a main battery. On the other hand, in an upper arm ON control mode, the DC-DC converter charge the main battery while the switching element is kept in an on state. On the basis of a state of external charging, a control device applies the upper arm ON control mode when a condition that upper arm ON control is applicable is satisfied, and applies the normal control mode when the condition is not satisfied.
    Type: Grant
    Filed: July 4, 2011
    Date of Patent: January 12, 2016
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, NIPPON SOKEN, INC.
    Inventors: Seiji Iyasu, Toru Wakimoto, Kenji Itagaki, Yoshinobu Sugiyama
  • Patent number: 9143056
    Abstract: A stacked voltage source inverter having separate DC sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems. The stacked inverter consists of at least one phase wherein each phase has a plurality of low voltage full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with fast switching and small low pass AC output filter. A system controller controls operating parameters for each inverter. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: September 22, 2015
    Assignee: EMPOWER MICRO SYSTEMS, INC.
    Inventors: Milan Ilic, Mika Nuotio
  • Patent number: 9130368
    Abstract: An overload prevention system and method for an electric circuit having a plurality of components is disclosed, where each component has a set of pre-computed parameters. For each component, monitored parameters are observed; a limited value is computed using the pre-computed and monitored parameters; and it is determined if the limited value reached a limit. If the limited value reaches the limit; the system limits one of the monitored parameters. Pre-computed parameters can include time constant and rated current; monitored parameters can include current; and limited value can be component temperature. A time constant, rated current and rated temperature can be pre-computed such that the temperature stays at or below the rated temperature when the current is substantially equal to the rated current. Per unit values can also be used such that per unit temperature stays at or below unity when per unit current is substantially equal to unity.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: September 8, 2015
    Assignee: DEERE & COMPANY
    Inventors: Eric Vilar, Joseph Lingle, Todd Velde, Neal Clements
  • Patent number: 9103888
    Abstract: There are provided a protection circuit and a gate driving circuit for a semiconductor switching device. The protection circuit for a semiconductor switching device includes an overcurrent determining unit operated according to a gate signal to determine whether a load current flowing through the semiconductor switching device controlling the load current is an overcurrent, a load open determining unit determining whether a load is open, on the basis of a detection value from a current detection unit detecting the load current, and an error detection unit generating a fault signal when it is determined that the overcurrent flows and the load is open, while the gate signal is in a turned on level of the semiconductor switching device.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: August 11, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Sung Man Pang
  • Patent number: 9042068
    Abstract: The present invention provides a protection circuit. The protection circuit includes an output stage circuit and a feedback unit that generates a first current. Under a first condition that the first current is one of currents larger than and equal to a rated current and the first condition remains for a first period, the feedback unit controls the output stage circuit to restrict the first current. Under a second condition that the first current is one of currents larger than and equal to a restriction current and the second condition remains for a second period, the feedback unit controls the output stage circuit to terminate the first current.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: May 26, 2015
    Assignee: HANERGY TECHNOLOGIES, INC.
    Inventors: Xiao-Ming Duan, Ronald Chang
  • Patent number: 9041426
    Abstract: The present invention provides to a default current testing method of the high voltage direct current converter valve composited by impulse voltage. The technical scheme of the invention composites the symmetrical positive and negative voltage and the impulse into asymmetric positive and negative high voltage, it makes the test valve voltage accurately achieve required peak value at the set time. The test circuit is simple relatively; the high voltage source of the default current test circuit is instead by surge generators. The test method is flexible, safe, and suitable for different DC project converter valves.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: May 26, 2015
    Assignees: STATE GRID SMART GRID RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINA, CHINA-EPRI ELECTRIC POWER ENGINEERING CO., LTD., CHINA ELECTRIC POWER RESEARCH INSTITUTE
    Inventors: Guang fu Tang, Kunpeng Zha, Jun Yang, Chong Gao
  • Publication number: 20150138683
    Abstract: A fault current limiter is provided. According to an embodiment of the present disclosure, the fault current limiter includes a switch whose contact point is opened when a fault current occurs; a current limiting element configured to limit the fault current when the fault current occurs; and a diode being serial-connected to the current limiting element, wherein a breakdown voltage of the diode is higher than a voltage drop by an impedance of the switch when a normal current flows.
    Type: Application
    Filed: October 30, 2014
    Publication date: May 21, 2015
    Applicant: LSIS CO., LTD.
    Inventors: Jung Wook SIM, Gyeong Ho LEE, Hae Yong PARK
  • Patent number: 9036315
    Abstract: High voltage direct current systems are provided including one or more outlets and an electronic current limiter circuit associated with the one or more outlets. The electronic current limiter circuit is configured to limit current inrush when a connector is plugged into and/or unplugged from the one or more outlets when a direct current bus associated with the one or more outlets is energized so as not to damage the connector; and/or isolate direct current faults and/or excess current draw in a load connected to the one or more outlets so as to protect the system from shutdown.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: May 19, 2015
    Assignee: Eaton Corporation
    Inventor: Robert William Johnson, Jr.
  • Patent number: 9036314
    Abstract: A computing device including a power connector to interface with a power source, logic and power components on a current path from the power connector; the power connector providing electrical power to the logic and power components, and an inrush protection circuit on the current path between the power connector and the logic and power components, the inrush protection circuit including: a first power dissipation device and a second power dissipation device arranged in parallel on the current path, a feedback loop to detect an amount of current in the current path and to control the first power dissipation device to operate in a manner to dissipate detected inrush current, and a first time delay network in communication with the second power dissipation device and causing a delay for the second power dissipation device to transition to an on state, wherein during steady state.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 19, 2015
    Assignee: NetApp, Inc.
    Inventors: Takashi Kanamori, Roshan Thakur
  • Publication number: 20150130438
    Abstract: An improved current limiting circuit comprising a switch having a first terminal and a second terminal, the first and second terminal configured to connect a power supply to a load. A first resistor connected in series between the first terminal and a first constant current source. A second resistor connected in series between the second terminal and a second constant current source. A control circuit configured to measure a voltage drop across the first resistor and compare the voltage drop to a voltage drop across the switch.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 14, 2015
    Applicant: LITTELFUSE, INC.
    Inventors: Sam S. Kang, John W. Jorgensen, Chad N. Marak
  • Patent number: 9030793
    Abstract: A circuit protection device for monitoring a current flowing from an electrical distribution line through a trip mechanism to a load includes an input conductor configured to receive a current signal from a sensor. At least one resistor is arranged to receive the current signal from the input conductor, and provides a voltage signal proportional to the current signal. The circuit protection device includes a control circuit coupled in parallel with the resistor and a power supply that receives the current signal from the resistor and supplies power to the control circuit based on the current signal. The control circuit is configured to receive the voltage signal and determine an amplitude of the current flowing through the trip mechanism based on the voltage signal. The control circuit is also configured to determine whether a predetermined current threshold is exceeded and to generate a control signal to activate the trip mechanism.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: May 12, 2015
    Assignee: General Electric Company
    Inventors: Zachary Herman Cull, Craig Benjamin Williams
  • Patent number: 9030796
    Abstract: A system for supplying direct current and DC voltage is provided. The system comprise a first supply branch having a first DC voltage source and a power field-effect transistor of a current limiter which are connected in series, and a second supply branch having a second DC voltage source. The power transistor has a current/voltage characteristic with a first inverse polarization area without current limitation, and a second conduction area with current limitation based on a current threshold. The power field-effect transistor is connected to the first voltage source with an inverse polarization when the voltage source of the first branch is operating normally.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: May 12, 2015
    Assignee: MERSEN France SB SAS
    Inventors: Franck Sarrus, Thierry Rambaud, Dominique Tournier, Philippe Godignon, Jean-François De Palma
  • Patent number: 9025294
    Abstract: A system for controlling a solid state circuit breaker comprises a solid state power switch, and a controller for providing a gate voltage to the power switch. During turnoff of the solid state power switch, the controller reduces the gate voltage to an intermediate level for a specified time period and then reduces the gate voltage to a turnoff level.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: May 5, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Steven J. Moss, Sastry V. Vedula
  • Patent number: 9024598
    Abstract: Provided is a converter control device which detects an on-failure of an auxiliary switch constituting an auxiliary circuit of a soft switching converter and can prevent element failures. A current sensor for detecting the current flowing in a coil is provided between a fuel cell and the. A controller sequentially detects current by use of the current sensor and makes a judgment as to whether or not the detected current has exceeded an overcurrent threshold value stored in a memory (not shown). When the controller judges that the current has exceeded the overcurrent threshold value, the controller judges that a second switching element has an on-failure, and performs a fail-safe operation by stopping the driving of a converter (for example, a U-phase converter) of an auxiliary circuit provided with this second switching element.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: May 5, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takahiko Hasegawa, Nobuyuki Kitamura, Kota Manabe, Takahiro Umehara
  • Patent number: 9019677
    Abstract: A semiconductor switching element drive circuit includes a semiconductor that passes main current between first and second terminals when voltage is imposed to a gate terminal, and an over current protection circuit that decreases the main current when the main current is judged to become over current for a certain period when exceeding a predetermined current value when current value or voltage value proportional to an amplitude of the main current exceeds a threshold value. The circuit also includes a short circuit protection circuit that decreases gate voltage imposed to the gate terminal earlier than a fall of the main current produced by the over current protection circuit when the main current becomes larger than the over current in a period shorter than the certain period, and a threshold value change circuit that decreases a threshold value when the short circuit protection circuit decreases the main current.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: April 28, 2015
    Assignee: Calsonic Kansei Corporation
    Inventor: Yoshiyuki Kikuchi
  • Publication number: 20150109708
    Abstract: An input redundant circuit according to the present disclosure may include: a core power supply unit; a first input port connected to a first input voltage; a second input port connected to a second input voltage; a relay unit connected to the first input port and the second input port to supply one of the first input voltage and the second input voltage to the core power supply unit; and a surge current limiting unit coupled to the relay unit, configured to limit a surge current generated when the relay unit is switched between the first input voltage and the second input voltage.
    Type: Application
    Filed: October 16, 2014
    Publication date: April 23, 2015
    Inventor: Chung Yan CHENG
  • Publication number: 20150107646
    Abstract: A photovoltaic energy conversion system, apparatus, and method for controlling DC sub-arrays of a photovoltaic array are disclosed. The method may include coupling each of N homerun branches from N sub-arrays to an inverter via N switches and monitoring current through each of the N homerun branches. A forward current through each of the N homerun branches is compared with a forward current threshold, and any backfeed current through any of the N homerun branches is compared with a backfeed current threshold. One or more of the N switches are opened in response to either the forward current exceeding the forward current threshold or the backfeed current exceeding a backfeed current threshold.
    Type: Application
    Filed: October 21, 2014
    Publication date: April 23, 2015
    Inventors: John Michael Fife, Eric Seymour
  • Patent number: 9013851
    Abstract: Disclosed is an inrush current control circuit for controlling current into a high-current circuit block. The inrush current control circuit comprises a number of distributed switches and a digital control circuit coupled to at least one of the distributed switches. The digital control circuit is configured to switch a first group of the distributed switches in response to an enable/disable signal. The digital control circuit is further configured to switch a second group of the distributed switches after a first programmable delay. According to one embodiment, a method comprises switching a first group of distributed switches by a digital control circuit of an inrush current control circuit in response to an enable/disable signal, and switching a second group of the distributed switches by the digital control circuit after a first programmable delay, thereby resulting in regulation of a flow of an inrush current.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: April 21, 2015
    Assignee: Broadcom Corporation
    Inventors: David Anthony Kidd, Ramesh Senthinathan
  • Publication number: 20150103459
    Abstract: The invention relates to an actuator circuit for actuating a circuit breaker controller, the circuit being characterized in that it comprises two branches in parallel between two terminals and in that the first branch includes only a first coil; the second branch includes a second coil having impedance that is lower than the first, in series with a switch controlled by a switch circuit.
    Type: Application
    Filed: April 22, 2013
    Publication date: April 16, 2015
    Inventor: Peter Von Allmen
  • Patent number: 9001482
    Abstract: A short-circuit protection circuit of a light emitting diode (LED) is for protecting a plurality of LED strings from a short-circuit condition. The short-circuit protection circuit includes a short-circuit protection unit and a control unit. The short-circuit protection unit is coupled to the plurality of LED strings to execute a short-circuit protection. The control unit coupled to the short-circuit protection unit and the LED strings is configured to control the short-circuit protection unit according to at least one of a feedback voltage and a compensation voltage, so as to determine whether to trigger the short-circuit protection. The feedback voltage is generated from a cross voltage of one of the LED strings, and the compensation voltage is generated according to a comparison result between the feedback voltage and a reference voltage for controlling a power supply of the LED strings.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 7, 2015
    Assignee: uPI Semiconductor Corp.
    Inventors: Wei-Jung Chen, Wen-Fu Lu
  • Publication number: 20150085416
    Abstract: An integrated circuit generating a driving signal to a load according to an input voltage and including an impedance switching unit, a first protection unit, a first detection unit and a control unit is disclosed. The impedance switching unit takes the input voltage as the driving signal according to a control signal. The first protection unit generates a first detection signal when a current passing through the impedance switching unit is higher than a predetermined current. The first detection unit detects a voltage of the impedance switching unit to generate a detection result. The control unit controls the control signal according to the first detection signal.
    Type: Application
    Filed: January 28, 2014
    Publication date: March 26, 2015
    Applicant: Nuvoton Technology Corporation
    Inventor: Ping-Ying CHU
  • Publication number: 20150077893
    Abstract: An electromagnetic direct current (DC) power system includes a plurality of pulse forming networks (PFN) modules. Each pulse forming network (PFN) module includes a PFN circuit, a fault current limiting (FCL) circuit and a cooling system. The pulse PFN circuit is configured to generate a pulsed DC output power. The PFN circuit further includes at least one energy storage inductor with primary winding having a primary winding inductance that controls a primary impedance of the PFN circuit. The FCL circuit includes a secondary winding that electrically communicates with the primary winding. The FCL circuit is configured to receive fault energy existing in the PFN circuit during a fault event. The cooling system is configured to cool at least one of the primary winding and the secondary winding, and remove a portion of the fault energy.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 19, 2015
    Applicant: Raytheon Company
    Inventor: Stephen B. Kuznetsov
  • Patent number: 8971002
    Abstract: A system and method for providing isolated power to the gate driving circuits used in solid state switching devices is disclosed. Rather than using expensive isolated AC/DC power supplies, an isolation transformer is used to provide isolated AC voltage. In one embodiment, the primary winding of the isolation transformer is disposed across an independent AC source. In another embodiment, the primary winding of the isolation transformer is disposed across two phases of the AC power line. Isolated AC voltage is then generated across the secondary winding of the isolation transformer. This isolated AC voltage is then used by a non-isolated DC power supply, which generates the power for the gate driving circuit.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: March 3, 2015
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Piotr R. Lubicki, Kasegn Tekletsadik
  • Publication number: 20150055261
    Abstract: A system and method for providing isolated power to the gate driving circuits used in solid state switching devices is disclosed. Rather than using expensive isolated AC/DC power supplies, an isolation transformer is used to provide isolated AC voltage. In one embodiment, the primary winding of the isolation transformer is disposed across an independent AC source. In another embodiment, the primary winding of the isolation transformer is disposed across two phases of the AC power line. Isolated AC voltage is then generated across the secondary winding of the isolation transformer. This isolated AC voltage is then used by a non-isolated DC power supply, which generates the power for the gate driving circuit.
    Type: Application
    Filed: August 22, 2013
    Publication date: February 26, 2015
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Piotr R. Lubicki, Kasegn Tekletsadik