Voltage And Current Patents (Class 361/79)
  • Patent number: 8054599
    Abstract: An apparatus, system, and method are disclosed for detecting a power system component failure. The invention includes detecting an amount of input power provided on a power supply side of a connector, where the connector is configured to connect a switching power supply to a load such that power flows from the switching power supply to the load through the connector; detecting an amount of output power provided on a load side of the connector; determining if the amount of input power detected on the power supply side of the connector is more than a predefined threshold amount greater than the amount of output power detected on the load side of the connector; and shutting down the switching power supply the amount of detected input power is more than the predefined threshold amount greater than the amount of detected output power.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Cecil C. Dishman, Randhir S. Malik
  • Patent number: 8054014
    Abstract: In a control system and a method for operating a permanent-magnet electrical machine, when the electrical machine is switched off after one of a functional computer and a monitoring computer of the control system has identified a fault, in order to reduce the braking torque of the electrical machine, which is switched-off but still rotating an output stage of the control system is subjected to a three-phase short circuit if the rotation speed D1 does not fall below a definable limit value GR1 or if a voltage U_DC of the output stage (2) exceeds a limit value Umax, and when the rotation speed D1 is below the definable limit value GR1 and a voltage U_DC of the output stage does not exceed a limit value Umax, all the circuits breakers (2o1, 2o2, 2o3, 2u1, 2u2, 2u3) of the output stage (2) are opened in order to fully disconnect the electrical machine from the output stage.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: November 8, 2011
    Assignee: Daimler AG
    Inventors: Lothar Rehm, Thomas Raumer
  • Publication number: 20110261492
    Abstract: For a system to avoid abnormal operation caused by a shorted parameter setting pin of an integrated circuit, a protection apparatus and method apply a buffered reference voltage to the parameter setting pin to define an internal parameter of the integrated circuit by the buffered reference voltage and an external element connected to the parameter setting pin, and detect the rapid variation of the internal parameter to trigger a shutdown signal or slow down the speed of the variation of the internal parameter reflected to an adjustable signal of the integrated circuit.
    Type: Application
    Filed: April 22, 2011
    Publication date: October 27, 2011
    Applicant: RICHTEK TECHNOLOGY CORP.
    Inventors: SHAO-HUNG LU, JING-MENG LIU, JO-YU WANG, ISAAC Y. CHEN, AN-TUNG CHEN
  • Publication number: 20110242716
    Abstract: To provide a protection circuit for a load circuit which can distinguish between an overcurrent generated at a load and a rush current generated at the time of turning on a semiconductor switch or switches provided on the downstream side of the semiconductor switch and can turn the semiconductor switch off only when the overcurrent is generated to thereby protect the load circuit. A comparator CMP1 compares a detection current I1 detected by an ampere meter 15 with a threshold current Iref set in advance. When the detection current I1 reaches the threshold current Iref, the semiconductor switch 11 is turned off to thereby protect the load circuit. Further, a voltage Vd on an electric wire coupling between a battery VB and the semiconductor switch 11 is measured. When a counter electromotive force is generated and the voltage Vd reduces, the threshold current Iref is reduced according to the voltage reduction.
    Type: Application
    Filed: December 24, 2009
    Publication date: October 6, 2011
    Applicant: YAZAKI CORPORATION
    Inventors: Keisuke Ueta, Akinori Maruyama, Yoshihide Nakamura
  • Patent number: 8000072
    Abstract: The present invention relates to an apparatus for short circuit protection. The apparatus comprises two supply inputs for connecting the apparatus to a terminal of a power supply and two supply paths being connected together and to the supply inputs, wherein each supply path comprises a disconnection means for disconnecting the supply path. Further the apparatus comprises a determination means for determining a current flowing from one of the supply paths through the other one of the supply paths and a control means for controlling the disconnection means of the supply paths dependent on the current determined by the determination means, wherein the control means is connected with the disconnection means and the determination means.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: August 16, 2011
    Assignees: Siemens VDO Automotive AG, Scania CV AB
    Inventors: Bernhard Bauer, Ola Dovnäs, Mauricio Hernandez-Distancia, Milan Krstev
  • Patent number: 8000913
    Abstract: A system, method and computer program product for processing utility data of a power grid is provided. In one embodiment, the system includes a datamart comprised of a plurality of physical databases storing utility data, a plurality of applications comprising an automated meter application configured to process power usage data from a plurality of automated meters, a power outage application configured to identify a location of a power outage, and a power restoration application configured to identify a location of a power restoration. The system may include an analysis engine comprising a plurality of analysis objects with each analysis object configured to process data to provide a specific analysis, wherein said analysis engine is accessible via one or more of the plurality of applications, and the system may include a report module configured to receive an output from the analysis engine and to output a report.
    Type: Grant
    Filed: January 17, 2009
    Date of Patent: August 16, 2011
    Assignee: Current Communications Services, LLC
    Inventors: David G. Kreiss, Daniel S. Brancaccio
  • Patent number: 7990668
    Abstract: Device protection using temperature compensation. A logic module associated with groups of capacitors adjusts complex impedance planes associated with the capacitor groups to account for ambient temperature variations. In particular, the logic module is configured to adjust a center of a circle of each complex impedance plane based on an average impedance. The average impedance for a selected capacitor group includes impedance measurements for groups other than the selected group, to prevent capacitor failures in that group from skewing the average. The logic module can adjust the circle center in response to changes in average impedance over periods of time. For example, the logic module can filter measured differences in average impedance using a low pass filter, to distinguish slow impedance changes caused by temperature variations and rapid impedance changes caused by capacitor failures. The logic module can adjust the circle center in accordance with the filtered difference value.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: August 2, 2011
    Assignee: Cooper Technologies Company
    Inventors: Timothy Robert Day, Daniel Patrick Roth
  • Publication number: 20110141634
    Abstract: A reel includes a reel drum enclosed within a housing comprising a first housing portion, a second housing portion, and a middle housing portion positioned therebetween. A spindle member has a first end connected to the first housing portion and a second end connected to the second housing portion. The spindle member extends through an opening in the drum so that the drum is rotatable about a spindle axis defined by the spindle member. The middle housing portion encircles the drum and has an aperture through which linear material can extend, the linear material of a type that may be spooled on the drum. The middle housing portion is rotatable about the spindle axis independently of the drum. In preferred embodiments, the reel is a cord reel and the linear material is electrical cord. In preferred embodiments, the middle housing portion is rotatable at least 360° about the spindle axis. In preferred embodiments, the drum is powered by an electric motor.
    Type: Application
    Filed: February 22, 2011
    Publication date: June 16, 2011
    Applicant: GREAT STUFF, INC.
    Inventors: Ramon A. Caamano, James B.A. Tracey
  • Publication number: 20110122538
    Abstract: A trigger is provided for switch closing of a dynamic switch that opens under current flow, the trigger being based on a measurement of the current flowing through the switch during burning of an arc. The voltage of the arc is measured or is approximated using an approximation formula for the voltage, and the power is calculated. The power or integrated power, i.e. the energy, through the switch is applied for the triggering.
    Type: Application
    Filed: July 20, 2009
    Publication date: May 26, 2011
    Inventor: Reinhard Maier
  • Patent number: 7948728
    Abstract: A semiconductor device of the present invention includes: a power input terminal; an internal power supply circuit that converts a voltage supplied from the outside to the power input terminal into a predetermined voltage; an analog circuit connected to an output side of the internal power supply circuit; an internal power output terminal connected to the output side of the internal power supply circuit; a logic circuit power input terminal; a logic circuit connected to the logic circuit power input terminal; and interterminal wiring connecting the internal power output terminal to the logic circuit power input terminal. The internal power supply circuit has a configuration of supplying power to the analog circuit and the logic circuit, and in a package assembly (finished product), a resting current in the logic circuit can be inspected without being influence by a consumption current in the analog circuit.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: May 24, 2011
    Assignee: Panasonic Corporation
    Inventors: Shinichiro Kataoka, Takehiro Yano
  • Publication number: 20110116196
    Abstract: A protection relay for an electrical switching apparatus for a load includes a number of voltage sensors structured to sense voltage applied to the load, a number of current sensors structured to sense current flowing to the load, and a processor cooperating with the number of voltage sensors and the number of current sensors. The processor determines a fault current available at the load. An output cooperates with the processor. The output is structured to output the determined fault current and a number of: incident energy at the electrical switching apparatus, and a personal protective equipment level operatively associated with the electrical switching apparatus. The processor determines from the determined fault current the number of: the incident energy at the electrical switching apparatus, and the personal protective equipment level operatively associated with the electrical switching apparatus.
    Type: Application
    Filed: November 17, 2009
    Publication date: May 19, 2011
    Inventors: JOE M. KELLIS, LAWRENCE B. FARR
  • Patent number: 7940505
    Abstract: Load switches are relatively common and in use with a variety of applications, and conventional load switches have been designed to have continually operating protection circuitry, which can consume a great deal of power. Here, a load switch integrated circuit (IC) is provided where a controller within the IC activates and deactivates various protection circuits in a sequence, allowing the protection circuit to protect the IC while also reducing power consumption.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: May 10, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Aline C. Sadate, Christopher T. Maxwell, Nakshatra S. Gajbhiye, Mustapha El-Markhi
  • Patent number: 7933105
    Abstract: A switching element driving device has a first transistor that decreases the gate voltage of a power element at a faster rate than during a normal turn-off, and a second transistor that decreases the gate voltage of the power element at a slower rate than during a normal turn-off. If the gate voltage detected by the gate voltage monitoring means when an overcurrent in the power element is detected by overcurrent detection means is greater than a predetermined value, the gate voltage is decreased by the first transistor, and then, while the power element remains on, the gate voltage is decreased by the second transistor. If the gate voltage detected by the gate voltage monitoring means when an overcurrent in the power element is detected by overcurrent detection means is less than or equal to the predetermined value, the gate voltage is decreased only by the second transistor.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: April 26, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideo Yamawaki, Hajime Kosugi
  • Publication number: 20110063768
    Abstract: Disclosed are systems and methods for monitoring an electrical wire. A safety device utilized to monitor the wire may include at least one current sensing device, at least one voltage sensing device, and at least one processing component. The current sensing device measures a current on at least one conductor of the wire. The voltage sensing device measures a voltage associated with the safety device. The at least one processing component receives the measurements and identifies, based upon the current measurement, an overcurrent event. The processing component then compares the voltage measurement to a stored voltage value and determines, based upon the comparison, that a difference between the voltage measurement and the stored voltage value satisfies a threshold condition. The processing component directs, based upon the determination, at least one relay to be opened to discontinue provision of an electrical power signal onto the electrical wire.
    Type: Application
    Filed: November 23, 2010
    Publication date: March 17, 2011
    Applicant: NEWIRE, INC.
    Inventors: Robert Jay Sexton, Fred Lane Martin
  • Publication number: 20110058295
    Abstract: A protective device including a substrate, a conductive section and a first auxiliary medium is provided. The conductive section is supported by the substrate, wherein the conductive section comprises a metal element electrically connected between first and second electrodes. The metal element serves as a sacrificial structure having a melting point lower than that of the first and second electrodes. The first auxiliary medium is disposed between the metal element and the substrate, wherein the first auxiliary medium has a melting point lower than that of the metal element. The first auxiliary medium facilitates breaking of the metal element upon melting.
    Type: Application
    Filed: September 3, 2010
    Publication date: March 10, 2011
    Applicant: CYNTEC CO., LTD.
    Inventors: Chung-Hsiung Wang, Hung-Ming Lin, Lang-Yi Chiang, Wen-Shiang Luo, Kuo-Shu Chen
  • Patent number: 7898781
    Abstract: An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies continuously with the line voltage. The arc fault detection apparatus has reduced susceptibility to nuisance tripping in the presence of sudden changes in the load current that occur outside of a specified time window centered on each zero crossing point of the line voltage.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: March 1, 2011
    Assignee: Sensata Technologies Massachusetts, Inc.
    Inventors: Keith W. Kawate, Lynwald Edmunds, Roger D. Mayer
  • Patent number: 7899630
    Abstract: A metering device of a power substation and method are provided for operating on a secondary analog waveform output by a transformer assembly receiving a primary waveform. The method includes stepping down the secondary waveform and generating a corresponding output signal; operating on the corresponding output signal for generating a corresponding first digital signal having a value proportional to the corresponding output signal and within a first range; and operating on the corresponding output signal for generating a corresponding second digital signal having a value proportional to the corresponding output signal and within a second range. The method further includes processing the first digital signal and outputting a corresponding first output signal; processing the second digital signal and outputting a corresponding second output signal; processing the first and second output signals; and generating output corresponding to the processing of the first and second output signals.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: March 1, 2011
    Assignee: Electro Industries/Gauge Tech
    Inventor: Erran Kagan
  • Patent number: 7884618
    Abstract: A system for testing the safety of electricity includes steps as following. First step is inserting a testing apparatus into a socket of utility power. Second step is providing a first amplifier and rectifier unit for measuring a first voltage wave as no-loading. Third step is providing a signal capturing unit at driver circuit for capturing an instant load cycle current wave. Fourth step is providing a second amplifier and rectifier unit for simulating a second voltage wave according to the instant cycle current wave. At least, a processing unit provides for comparing the first voltage wave with the second voltage wave. Therefore, the above-mentioned method is provided for determining the quality of household electricity wire and further improving the electricity safety.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: February 8, 2011
    Assignee: Powertech Industrial Co., Ltd.
    Inventor: Yu-Lung Lee
  • Publication number: 20110012564
    Abstract: A DC power tool having an interiorly provided lithium battery element and a charging switch includes a safety protection module to eliminate the risk of circuitry burn-out and other dangers resulting from connecting the power tool to a power supply with unmatched rated voltage and rated current when charging the power tool via use of an adapter.
    Type: Application
    Filed: July 13, 2010
    Publication date: January 20, 2011
    Applicant: CHERVON LIMITED
    Inventors: Dezhong Yang, Junya Duan
  • Patent number: 7871857
    Abstract: Methods of forming multi-chip semiconductor substrates include forming a first plurality of dicing streets in a first surface of a first semiconductor wafer having a first plurality of bonding sites thereon and forming a second plurality of dicing streets in a first surface of a second semiconductor wafer having a second plurality of bonding sites thereon. The first surfaces of the first and second semiconductor wafers are bonded together so that the first plurality of dicing streets are aligned with the second plurality of dicing streets and the first plurality of bonding sites are matingly received and permanently affixed within the second plurality of bonding sites. A plurality of bonded pairs of semiconductor chips are then formed by planarizing the second surface of the second semiconductor wafer until the second plurality of dicing streets are exposed.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: January 18, 2011
    Assignee: Integrated Device Technology, inc.
    Inventors: Kuolung Lei, Harmeet Bhugra
  • Patent number: 7872447
    Abstract: In an electrical storage apparatus including an electric storage device connected between a main power supply and a load, a first bypass FET and a bypass diode which are connected in series between the main power supply and the load are provided, and first and second main path FETs connected in series between the electric storage device and the load are provided. A controller judges that the first bypass FET suffers an open-circuit failure if the voltage (Va) of the load is equal to or smaller than the first threshold value Vth1 or if the voltage (Vc) at the connection point between the first bypass FET and the bypass diode is equal to or smaller than the second threshold value Vth2, when the first bypass FET is turned on and the first main path FET and the second main path FET are turned off.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: January 18, 2011
    Assignee: Panasonic Corporation
    Inventors: Kazuki Morita, Hideaki Hamai, Yohsuke Mitani
  • Patent number: 7868619
    Abstract: A method and an arrangement are disclosed for monitoring connections of a switch intended for activating a safety function, the switch having at least two poles. The arrangement can supply voltages to first sides of two poles of the switch through first connections, and monitor the voltages supplied through the switch and further from second sides of the two poles of the switch to a device through second connections. The arrangement can form a voltage difference between the voltages to be supplied to the first sides of the two poles of the switch, and detect a connection failure when the difference between the voltages supplied to the device does not correspond with the formed voltage difference or when the difference between the voltages supplied to the device is substantially zero.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: January 11, 2011
    Assignee: ABB Oy
    Inventor: Jani Kangas
  • Patent number: 7843676
    Abstract: An uninterruptible power supply (UPS) system includes an AC power input configured to receive AC power from a single-phase AC power source or a multi-phase AC power source, a DC power source, an output circuit including a power output, a controllable switch configured to selectively couple at least one of the AC power input and the DC power source to the output circuit, and a processor coupled and configured to affect operation of the output circuit depending upon which of single-phase and multi-phase operation of the UPS is indicated.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: November 30, 2010
    Assignee: American Power Conversion Corporation
    Inventors: Damir Klikic, Mirza A. Beg, Mark R. Melanson, Edward Kotlyar, Jeffrey B. Samstad
  • Patent number: 7843674
    Abstract: A motor-drive circuit comprising: a current-passage-control circuit to perform ON/OFF control of a drive transistor connected to a motor coil to pass current through the motor coil; an overcurrent-state-detection circuit to detect whether current passing through the drive transistor is in an overcurrent state where the current exceeds a predetermined threshold value; a charging and discharging circuit to start charging a capacitor in response to detecting the overcurrent state by the overcurrent-state-detection circuit and subsequently discharge the capacitor in response to not detecting the overcurrent state; and an overcurrent-protection-control circuit to stop the ON/OFF control to turn off the drive transistor, for an elapsed charging period for a charging voltage of the capacitor at a predetermined voltage to exceed a threshold voltage, and determine whether to perform such an overcurrent-protection-control as to turn off the drive transistor by detection of the overcurrent state, after the charging peri
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: November 30, 2010
    Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
    Inventor: Yuji Uchiyama
  • Patent number: 7804353
    Abstract: The present invention includes: a main voltage detection unit for detecting a voltage applied between main electrodes of an electrical power switching element; a control current source for injecting a current into a gate electrode of the electrical power switching element in accordance with the voltage detected by the main voltage detection unit; a main current detection unit for detecting a main current flowing between the main electrodes of the electrical power switching element; and an adjustment unit for adjusting a current of the control power source in accordance with the main current detected by the main current detection unit.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: September 28, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiromichi Tai
  • Patent number: 7793115
    Abstract: Method, and apparatus for operating a power feed in a computing system. One exemplary embodiment includes monitoring the power feed to ensure the power level of the entire system never remains above a first power level and only remains above a second power level for a period of time determined by a timer level.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: September 7, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Roger Edward Tipley, Robert A Pereira, E David Neufeld
  • Patent number: 7760479
    Abstract: A circuit that protects from high power-on in-rush currents and short circuits. The circuit has a pass transistor and a parallel smaller transistor. A comparator senses when an output voltage crosses a reference and turns off the pass transistor and turns on the parallel smaller transistor. The parallel smaller transistor has a higher “on” resistance so that the short circuit or the in-rush current does not harm the electronics. When the short circuit or in-rush current condition is removed, the comparator senses this condition and returns to the normal operation where the pass transistor is on and the parallel small transistor is off.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: July 20, 2010
    Assignee: Fairchild Semiconductor Corporation
    Inventor: James Garrett
  • Publication number: 20100165527
    Abstract: A bi-directional protection circuit employs a single comparator for detecting fault conditions. Diodes are coupled between a detection node and voltage dividers setting references for inverting and non-inverting comparator inputs, each diode forward biased during one of the positive and negative halves of the alternating current input signal cycle and coupling the detection node to a respective one of the inverting and non-inverting comparator inputs, and reverse biased during the other of the positive and negative halves and decoupling the detection node from the other of the inverting and non-inverting comparator inputs. Upon an overcurrent condition during the positive half, a voltage at the inverting comparator input is drawn above the reference voltage at the non-inverting input. Upon an overcurrent condition during the negative half, a voltage at the non-inverting comparator input is drawn below the reference voltage at the inverting input.
    Type: Application
    Filed: November 30, 2009
    Publication date: July 1, 2010
    Applicant: STMicroelectronics, Inc.
    Inventor: Michael James Callahan, JR.
  • Patent number: 7737650
    Abstract: The invention concerns a method for controlling a switching assembly comprising a plurality of transistors connected in parallel, having a linear operating mode, a closed-switch operating mode and an off operating mode including a first operating phase during which a current flows from a source terminal to a drain terminal and a second operating phase during which no current flows. The method includes the following successive steps; (a) controlling the switching assembly in closed-switch mode during part of the first phase; (b) controlling the switching assembly in linear mode; (c) controlling the assembly in off mode during part of the second phase.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: June 15, 2010
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Pierre Sardat
  • Patent number: 7719808
    Abstract: A power converter includes a controller and at least one output terminal for providing an output voltage and an output current to a load. The controller is configured for monitoring the output voltage and the output current and calculating an efficiency of the power converter based on the monitored output voltage and output current. The controller is also configured to generate a fault signal after detecting a degradation in the power converter efficiency.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: May 18, 2010
    Assignee: Astec International Limited
    Inventors: Vijay Phadke, Gordon Currie, Arlaindo Asuncion
  • Patent number: 7719807
    Abstract: Methods and apparatus for enabling internal circuitry associated with a device to be efficiently replaced in an operating environment for the device are disclosed. According to one aspect of the present invention, a device includes an enclosure that defines an interior of the device, and a circuit arrangement that is located in the interior. A data port interface is located in the interior, and the device also includes a receptacle and a protection circuitry arrangement. The receptacle is coupled to the circuit arrangement, and the protection circuitry arrangement provides protection to the circuit arrangement. The protection circuitry arrangement has an interface that is removably coupled to the receptacle such that at least a portion of the protection circuitry arrangement is contained in the interior of the device.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: May 18, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Frederic Michael Kozak, Kevin Franklin Casey, Mark Allen Rosen, Milton Palmer Hilliard
  • Patent number: 7710076
    Abstract: A back-gate voltage generator circuit generating a back-gate voltage of a four-terminal back gate switching MOSFET for charge and discharge control is disclosed. The back-gate voltage generator circuit includes first and second n-type MOSFETs connected in series through a common source electrode. A voltage at the common source electrode of the first and second n-type MOSFETS connected in series serves as the back-gate voltage of the four-terminal back gate switching MOSFET, and the back-gate voltage is used as a reference voltage for generating signals for controlling the first and second n-type MOSFETS.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: May 4, 2010
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomoyuki Goto
  • Publication number: 20100103575
    Abstract: A floating protection circuit is utilized for a photo-flash capacitor charger. The floating protection circuit includes a comparator and a timer. The comparator is coupled between two feedback resistors of the photo-flash capacitor charger for receiving a feedback voltage. When the feedback voltage is lower than an offset voltage, the comparator outputs a reset signal. If the timer does not receive the reset signal for a predetermined time, the timer outputs a turn-off signal to a switch control circuit of the photo-flash capacitor charger to shut down the switch control circuit.
    Type: Application
    Filed: January 8, 2009
    Publication date: April 29, 2010
    Inventors: Yung-Chun Chuang, Yu-Min Sun, Chien-Chuan Chung
  • Publication number: 20100097736
    Abstract: A method of protecting a bus in a three-phase electrical power system comprises the steps of (a) sampling voltage values and current values of each phase of the or each power system element within a predefined protection zone; (b) analysing at least one sampled voltage value of each phase of a power system element within the protection zone to detect when a fault condition arises; (c) on detection of a fault condition, determining whether the fault condition has arisen because of a bus fault; and (d) electrically isolating the bus from the or each power system element within the protection zone when a bus fault is determined so as to clear the bus fault.
    Type: Application
    Filed: December 14, 2006
    Publication date: April 22, 2010
    Inventors: Alexander Apostolov, Roland Passet, Frederic Auperrin, Damien Tholomier
  • Patent number: 7688560
    Abstract: This invention relates to overload protection for a circuit driving a direct current (DC) load.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: March 30, 2010
    Assignee: ICS Triplex Technology Limited
    Inventors: Thomas Bruce Meagher, Kenneth John Murphy, Linda M. Murphy, legal representative
  • Patent number: 7679877
    Abstract: A method and a device for operating a transmission line are provided. The device includes a line driver circuit and a protective circuit. The line driver circuit converts an input signal of the device into a current or a voltage for the transmission line while the protective circuit prevents an overvoltage and/or an overcurrent on the transmission line. The line driver circuit and the protective circuit are integrated in a common package.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: March 16, 2010
    Assignee: Infineon Technologies AG
    Inventors: Thomas Linder, Bernhard Zojer
  • Patent number: 7675725
    Abstract: A constant voltage output circuit has an output power transistor supplied with electric power form a first input power source and a control circuit supplied with electric power from a second input power source. Here, when the voltage from the first input power source is equal to or higher than a predetermined level Va, an overcurrent protection circuit and a short-circuiting protection circuit operate. Furthermore, yet another protection circuit is provided that operates even when the voltage from the first input power source is lower than the predetermined level Va.
    Type: Grant
    Filed: November 2, 2007
    Date of Patent: March 9, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Hideo Matsuda
  • Patent number: 7667941
    Abstract: This invention relates to a power supply circuit protecting method and a power supply circuit protecting apparatus. The apparatus is provided with a power supply circuit for converting a voltage from a three-phase alternating current inputting power supply into a predetermined voltage, and an output operation circuit for performing a predetermined operation by adopting an output voltage from the power supply circuit as input. In the apparatus, based on a current value on the input side or the output side of the power supply circuit, abnormality of the supply voltage is judged, and when there is an abnormality, the output operation circuit is controlled.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 23, 2010
    Assignee: Daikin Industries, Ltd.
    Inventor: Reiji Kawashima
  • Patent number: 7663457
    Abstract: Magnetically latching and releasing a voice coil actuator for controlling electrical switchgear. The voice coil actuator includes a voice coil magnet disposed on a common longitudinal axis with respect to a voice coil assembly. A coil of the voice coil assembly exerts a magnetic force on the voice coil assembly, thrusting the voice coil assembly towards the voice coil magnet. At least one pair of latching members mounted to the voice coil assembly creates a permanent magnet circuit between the latching members and the voice coil magnet. The permanent magnet circuit maintains the position of the voice coil assembly relative to the voice coil magnet, even when power to the coil is removed. This latch can be released by applying a current in the coil or by applying an external, physical force to a member coupled to the voice coil assembly.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: February 16, 2010
    Assignee: Cooper Technologies Company
    Inventors: Bela Peter Szeifert, Michael Peter Dunk
  • Patent number: 7640120
    Abstract: An arc detection means for detecting arcs in a plasma process includes at least one comparator to which an evaluation signal such as an output signal or an internal signal of an AC generator relating to the output signal and a reference value are supplied. The comparator is connected to a logic component that generates a signal for an arc suppression device.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: December 29, 2009
    Assignee: Huettinger Elektronik GmbH + Co. KG
    Inventors: Sven Axenbeck, Markus Bannwarth, Martin Steuber, Peter Wiedemuth, Lothar Wolf
  • Patent number: 7639050
    Abstract: In a load-drive controller, a first comparing unit compares a load current supplied from an H bridge circuit and a desired setting current; a PWM control unit generates a control signal to control the load current; a gate driver drives and controls output transistors of the H bridge circuit based on the control signal, and a load current monitoring unit determines which is larger a level shift equivalent value of the setting current or a peak hold equivalent value of the load current, and the PWM control unit controls increase or decrease of the load current based on a comparison result of the first comparing unit and on a determination result of the load current monitoring unit, so that the load current quickly reaches the setting current of a micro step drive during decrease of the setting current.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: December 29, 2009
    Assignee: Panasonic Corporation
    Inventor: Atsushi Chigira
  • Publication number: 20090316318
    Abstract: A protection circuit limits operating power supplied to an electrical device from an electrical power source below a predetermined power rating. The protection circuit comprises a switching device for adjusting electrical power supplied from the power source to the electrical device; a sensor sensing a parameter relating to the operating power; and a comparator comparing the parameter sensed by the sensor and, in response to identifying an undesirable operating condition, controlling the switching device to adjust electrical power supplied to the electrical device to below a predetermined power rating.
    Type: Application
    Filed: June 18, 2008
    Publication date: December 24, 2009
    Inventors: Memie Mei Mei Wong, Sam Yun Sum Wong
  • Patent number: 7636224
    Abstract: The invention refers to a method and an apparatus (1) for protecting people against leakage currents while using appliances such as home appliances or the like. The apparatus (1) is provided with a differential switch (20) normally open and a differential current transformer (39) which generates a signal proportional to the leakage current, an elaboration unit (50) interfaced with the latter acquires said signal and keeps the switch (20) closed until a dangerous condition is met, corresponding to an acquired signal having a magnitude greater than a limit value.
    Type: Grant
    Filed: April 19, 2004
    Date of Patent: December 22, 2009
    Assignee: Trinity S.A.
    Inventor: Sandro Zandonella Balco
  • Patent number: 7629771
    Abstract: A protection device for non-common ground buses is disclosed. The protection circuit includes a controller, a level shifter, a first group of switches, and a second group of switches. The controller together with the level shifter controls the first group and second group of switches. The non-common ground buses will be isolated when at least one group of the switches are turned off in an abnormal condition.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: December 8, 2009
    Assignee: O2Micro International, Ltd.
    Inventors: Guoxing Li, Shiqiang Liu, Sean Xiao
  • Publication number: 20090257160
    Abstract: A universal trip unit for use with a circuit breaker apparatus is provided and includes a communication unit configured to communicate with a personality module of the circuit breaker apparatus and to thereby receive key breaker personality parameters that relate to operational characteristics of the circuit breaker apparatus, and a controller. The controller includes a memory on which a universal register, previously stored key parameters and the received key breaker personality parameters are stored, the controller being configured to control the communication unit to receive the key breaker personality parameters in accordance with information determined from the universal register, and components to execute trip protection when at least one of a current and a voltage Within the circuit breaker apparatus exceeds a respective predetermined threshold as defined by the previously stored key parameters and the received key breaker personality parameters.
    Type: Application
    Filed: April 15, 2008
    Publication date: October 15, 2009
    Applicant: General Electric Company
    Inventors: Nataniel Barbosa Vicente, Marcelo Esteban Valdes, Rafael Gutierrez, JR.
  • Patent number: 7598751
    Abstract: Embodiments according to the present invention provide an Impedance-based Arc-Fault Determination Device (IADD) and method that, when attached to an electrical node on the power system and through observations on voltage, current and phase shift with a step load change, determine the effective Thevenin equivalent circuit or Norton equivalent circuit at the point of test. The device and method determine the expected bolted fault current at the test location of interest, which enables calculation of incident energy and the assignment of a flash-hazard risk category.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: October 6, 2009
    Assignees: Clemson University Research Foundation, Duke Energy Carolinas, LLC
    Inventors: Edward Randolph Collins, Jr., Timothy Lee Smith, Randall J. Emanuel
  • Patent number: 7573688
    Abstract: Protection methods and protection systems, for high current semiconductor devices with diode junctions, that detect the anomalies in the local temperature at small areas of the junction and protect the device from accelerated aging and premature catastrophic damage. In an embodiment of the method of this invention for protecting a high current semiconductor devices with diode junctions, anomalies in the electrical or optical behavior of the junction are detected and, upon detection of the anomalies, power is diverted away from or around the device.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: August 11, 2009
    Assignee: Science Research Laboratory, Inc.
    Inventor: Joseph Mangano
  • Publication number: 20090180226
    Abstract: An electrical circuit comprising a power supply, a load, a first pair of parallel positive cables between the power supply and the load, a first pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, in which the incendive arc prevention means comprises monitoring means adapted to monitor the first pair of positive cables and the first pair of negative cables, and to detect if the current and/or voltage in one of the first pair of positive cables deviates from the other, and if the current and/or voltage in one of the first pair of negative cables deviates from the other, and in which the incendive arc prevention means comprises a control means adapted to fully or partially isolate the power supply from the first pair of positive cables and the first pair of negative cables if the monitoring means detects that the current and/or voltage of one of the first pair of positive cables has deviated from the other, or if the current and/or voltage of one of the fi
    Type: Application
    Filed: February 5, 2007
    Publication date: July 16, 2009
    Applicant: Pepperl & Fuchs
    Inventors: Gunther Rogoll, Renato Kitchener
  • Publication number: 20090174977
    Abstract: The invention relates to a voltage detection control technology, especially relate to a hardware overvoltage disconnecting circuit wherein a DC power supply module is disconnected from a power network when the AC power network is in the state of overvoltage. The hardware overvoltage disconnecting circuit comprises a disconnecting relay and a voltage detection circuit. The disconnecting relay is connected in series between an AC power network and a power factor correction circuit of a power supply module. A first sampling terminal of the voltage detection circuit samples the voltage of the AC power network between the AC power network and the disconnecting relay, and an output of the voltage detection circuit is connected to a control terminal of the disconnecting relay. When the AC power network is in the state of overvoltage, the disconnecting relay is disconnected and the power supply module is disconnected from the AC power network.
    Type: Application
    Filed: February 13, 2007
    Publication date: July 9, 2009
    Applicant: Emerson Network Power Energy Systems, North America, Inc.
    Inventors: Chunhui Zhu, Jingjing Huang, Shudu Liu
  • Patent number: 7558037
    Abstract: Circuit and method for providing over-current and overloading protection with a single additional pin. A converter controller circuit is provided that includes a voltage controlled oscillator and outputs upper and lower gating signals for driving the upper and lower driving transistors in a voltage converter, for example, in an inductor-inductor capacitor half-bridge circuit topology. A current sense input pin of the circuit receives a voltage corresponding to the current flowing in the half-bridge circuit. A feedback input pin has an external capacitor coupled to it and receives a voltage from an output voltage sensor at the output terminals. Over-current protection is provided by sensing the voltage at the current sense input pin with no external components needed. Overload protection is provided by utilizing the external feedback capacitor and the feedback input pin during overload conditions. Methods for providing over-current and overload protection are disclosed.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: July 7, 2009
    Assignee: Infineon Technologies AG
    Inventors: Xiaowu Gong, Yi He, Tuck Meng Chan