With Multiple Timing Characteristics Patents (Class 361/97)
  • Patent number: 10348079
    Abstract: The present overcurrent protective device comprises an input terminal configured to receive a power supply voltage, an output terminal, a switch, a detector, and a controller. The switch is provided between the input terminal and the output terminal. The detector is configured to output a limitation signal without delay when a current flowing through the switch exceeds a prescribed tolerance value. The controller is configured to receive the limitation signal and control the switch to prevent the current from exceeding the tolerance value. The detector is configured output a turn-off signal to the controller when a first state continues for a delay time determined depending on the current's magnitude. The first state is a state where the current is smaller than the tolerance value and the current exceeds a first threshold value smaller than the tolerance value. The controller turns off the switch in response to the turn-off signal.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: July 9, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Makoto Yasusaka, Daisaku Shugo, Shinichi Hirata
  • Patent number: 9692298
    Abstract: A transient event detector includes a first reference generator, an adjustable low-pass filter, and a comparator. The first reference generator coupled to scale the input current signal to generate a first reference current signal that tracks the input current signal. The adjustable low-pass filter circuit is coupled to receive the input current signal and to generate a filtered input current signal such that a magnitude of a slope of the filtered input current signal is less than the magnitude of the slope of the input current signal during a transient event. The first comparator is coupled to generate an event detection signal that indicates the presence of the transient event in response to a value of the filtered input current signal reaching a value of the first reference current signal. The adjustable low-pass filter circuit is configured to increase the cutoff frequency in response to the event detection signal.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: June 27, 2017
    Assignee: Power Integrations, Inc.
    Inventors: Ricardo Luis Janezic Pregitzer, Mingming Mao, Tiziano Pastore, Michael Yue Zhang, Yury Gaknoki
  • Patent number: 9548658
    Abstract: A control circuit configured to control a switch-type converter, can include: (i) a state detect circuit configured to generate an error amplifying signal according to a feedback voltage and a reference voltage, to compensate the error amplifying signal by a ramp compensation signal having a predetermined frequency, and to generate a state signal by comparing the compensated error amplifying signal against a voltage ripple signal, where the voltage ripple signal changes along with an inductor current of the switch-type converter; and (ii) a control signal generator configured to generate control signals to control the switch-type converter according to the state signal.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: January 17, 2017
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Kailang Hang, Jiubing Luo
  • Patent number: 9484814
    Abstract: A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device is disclosed. The magnitude of the variable current is controllable in response to a control signal. The bleeder controller includes a dimming detector to classify a half line cycle as leading-edge-dimmed or a trailing-edge-dimmed in response to at least one of an input current sense signal and an input voltage sense signal.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: November 1, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Ricardo Luis Janezic Pregitzer, Mingming Mao, Tiziano Pastore, Michael Yue Zhang, Yury Gaknoki
  • Patent number: 9304168
    Abstract: An electronic trip device is described that includes a test current generator and a leakage current detection circuit. The test current generator is coupled to a conductor and configured to provide a test current having a magnitude to the conductor in response to a selection to test the electronic trip device. The conductor is a line conductor or a neutral conductor. The leakage current detection circuit is configured to detect a current difference between the neutral conductor and the line conductor. The leakage current detection circuit is configured to provide, in response to the selection to test the electronic trip device, a tripless error indication if the detected current difference is less than a first threshold value.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: April 5, 2016
    Assignee: General Electric Company
    Inventors: Srinath Rao Topucharla, Chandrashekar Nagawaram, Alok Kumar Bharati, Craig Benjamin Williams, Rajani Karra
  • Patent number: 9190200
    Abstract: A method and system for moving magnetic material includes an electromagnet wherein known problems associated with DC power circuit interruptions are substantially reduced. The system includes a generator coupled to an electromagnet, the generator being powered by a power supply through a first set of contactors which are configured to open and close a first circuit between the power source and the generator coupled to the magnet to start and stop a lifting sequence, wherein the first circuit includes a first bridge rectifier, a reactance element, and a first resistance element.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: November 17, 2015
    Assignee: EPHAUGH, INC.
    Inventor: John Samila
  • Patent number: 8767364
    Abstract: When a short-circuited FET is identified as one of low-side FETs, maximum phase voltages of three phases are detected when a steering operation is performed by a driver, and the detected maximum phase voltages of the three phases are compared with one another to identify a short-circuit phase. On the other hand, when a short-circuited FET is identified as one of high-side FETs, minimum phase voltages of the three phases are detected when a steering operation is performed by the driver, and the detected minimum phase voltages of the three phases are compared with one another to identify a short-circuit phase.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: July 1, 2014
    Assignee: JTEKT Corporation
    Inventor: Shigekazu Okumura
  • Patent number: 8605393
    Abstract: A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor of a compressor. The current averaging module generates first and second average current values based on the current measured by the current monitor. The voltage monitor measures a utility power voltage. The voltage averaging module generates first and second average voltage values based on the voltage measured by the voltage monitor. The control module selectively generates a fault signal when a first ratio is greater than a first predetermined threshold and a second ratio is less than a second predetermined threshold. The first ratio is based on the first and second average current values. The second ratio is based on the first and second average voltage values. The switch deactivates the motor when the fault signal is generated.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: December 10, 2013
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Nagaraj B. Jayanth, George Ramayya
  • Patent number: 8514540
    Abstract: A smart load switch or smart plug incorporates a built-in circuit that can monitor a physical variable condition and compare that sensed condition to data stored in a memory. A controller receives input data from the measuring device, compares the data to the reference data in memory, and selectively controls the on/off condition of a switch and thus the device that is plugged into the switch.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: August 20, 2013
    Assignee: General Electric Company
    Inventors: John K. Besore, Michael Thomas Bcycrle
  • Patent number: 8385038
    Abstract: The system of the invention includes a circuit breaker switching control section (100) and a setting control section (700) connected therewith through a communication network (500). The circuit breaker switching control section (100) transmits a circuit breaker state quantity acquired by a signal input section (120) through the communication network to a set value calculation section (740) of the setting control section (700). The set value calculation section (740) of the setting control section calculates a set value to be set in the switching control section (100) of the circuit breaker, using the state quantity of the circuit breaker that was transmitted thereto. The setting control section (700) transmits to the circuit breaker switching control section the set value calculated by the set value calculation section (730) through the communication network.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: February 26, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Minoru Saito, Hiroyuki Maehara, Osamu Hosokawa
  • Patent number: 8244489
    Abstract: A method and apparatus measures electrical power usage and quality, while mitigating the effects of noise on measured signals or parameters. Specifically, a digital electrical power and energy meter employs a method in which a processor averages a parameter, such as voltage or current, over a plurality of cycles of a time-varying signal, such as an AC electrical signal. The method employed by the meter samples a parameter over the plurality of cycles and computes the average of the samples corresponding to the same phase angle of the signal to produce an average signal.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: August 14, 2012
    Assignee: Electro Industries/Gauge Tech
    Inventor: Tibor Banhegyesi
  • Patent number: 8237309
    Abstract: An arrangement having DC power supply units connection parallel, wherein, the power supplies of the DC power supply units each generate a partial output current for supplying a load with a total output current. In accordance with the invention, an overload of power supply units when the power supply units are switched on and/or during their restart is largely avoided.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: August 7, 2012
    Assignee: Siemens AG
    Inventor: Arnold Klamm
  • Patent number: 8143858
    Abstract: When a battery pack, comprising an overcurrent protection section for stopping, when a current greater than a first threshold value passes, a current supply, is connected to a power supply terminal of an information processing apparatus, the information processing apparatus draws a current greater than the first threshold value. Thereafter, an output current and output voltage of the battery pack are detected, thereby measuring a time period from when a current drawing section draws the current greater than the first threshold value to when the battery pack stops the current supply. When the measured time period is within a first predetermined time range, the battery pack is permitted to supply an electric power. On the other hand, when the measured time period is not in the first predetermined time range, the battery pack is prohibited from supplying the electric power.
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: March 27, 2012
    Assignee: Nintendo Co., Ltd.
    Inventors: Shuichi Tsugawa, Takeshi Nabesaka
  • Patent number: 8134253
    Abstract: A load driving circuit (20) according to the present invention, for carrying out PWM control to cause currents of respective light emitting diode lines (3-1 . . . 3-N) connected in parallel, each of the light emitting diode lines (3-1 . . . 3-N) including a plurality of light emitting diodes (4) connected in series, causes timing at which a current of any one of the light emitting diode lines (3-1 . . . 3-N) is turned on or off to be different from timing at which current(s) of at least another one of the light emitting diode lines (3-1 . . . 3-N) is(are) turned on or off. This makes it possible to provide a load driving circuit which (i) does not have a reduction in a degree of freedom in selecting a frequency of a PWM control signal that is used to control loads, (ii) does not prevent a peripheral circuit from following the PWM control circuit, and (iii) prevents generation of sounds.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: March 13, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Chihiro Watanabe
  • Patent number: 8054605
    Abstract: A gate driver 28 performs a normal charging operation for a power MOSFET 14 by driving a charge pump 90 solely, when a low-level control signal S1 (ON signal) is received during a normal state. On the other hand, if a low-level control signal S1 (ON signal) is received during a load anomaly state, an urgent charge FET 92, as well as the charge pump 90, is turned on when a load current IL exceeds a second anomaly threshold current ILfc, so that a rapid charging operation is performed.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: November 8, 2011
    Assignees: Autonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Seiji Takahashi, Masayuki Kato, Masahiko Furuichi, Isao Isshiki
  • Patent number: 8018703
    Abstract: An auxiliary device for remote data transmission having processing means comprising a first input to receive a first data item of a state of the circuit breaker, and at least one command output to command transmission of data. The processing means comprise: a second input to receive at least one second data item representative of an electrical fault or of an auxiliary command, identification means to identify the type of electrical fault, and initialization means of the at least one command output. An auxiliary unit and a circuit breaker comprising the device. A method for implementing said device.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: September 13, 2011
    Assignee: Schneider Electric Industries SAS
    Inventor: Mustapha Chelloug
  • Patent number: 7961485
    Abstract: In one embodiment, a PWM controller is configured to inhibit forming a drive signal responsively to an overload sense signal having a value that is no greater than a first value for a first time interval and to form a first duration of the first time interval responsively to the overload sense signal.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: June 14, 2011
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Jonathan P. Kraft
  • Patent number: 7920976
    Abstract: A method and apparatus measures electrical power usage and quality, while mitigating the effects of noise on measured signals or parameters. Specifically, a digital electrical power and energy meter employs a method in which a processor averages a parameter, such as voltage or current, over a plurality of cycles of a time-varying signal, such as an AC electrical signal. The method employed by the meter samples a parameter over the plurality of cycles and computes the average of the samples corresponding to the same phase angle of the signal to produce an average signal.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: April 5, 2011
    Assignee: Electro Industries / Gauge Tech.
    Inventor: Tibor Banhegyesi
  • Patent number: 7746615
    Abstract: System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, and a comparator configured to receive the cycle threshold and a feedback signal and generate a comparison signal. Additionally, the system includes a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal, and a switch configured to receive the modulation signal and control an input current for a power converter. The input current is associated with an output power for the power converter. The cycle threshold corresponds to a threshold power level for the output power. The threshold power level is constant, decreases, or increases with respect to the input signal.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: June 29, 2010
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Zhen Zhu, Jun Ye, Shifeng Zhao, Lieyi Fang, Zhiliang Chen
  • 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: 7538519
    Abstract: In a method and system for protecting a battery being charged by an electrical device, a current flowing through a cell stack of the battery is measured. If the measured current is greater than a predefined value the battery is isolated from the device. If subsequent current measurements made within a predefined time interval indicate that the measured current is less than or equal to the predefined value then the battery is recoupled to the device. If the measured current remains greater than the predefined value during the predefined time interval then a fuse is blown and the battery is disabled.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: May 26, 2009
    Assignee: Dell Products L.P.
    Inventors: Youssef Daou, Andrew T. Sultenfuss
  • Publication number: 20080212248
    Abstract: System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, and a comparator configured to receive the cycle threshold and a feedback signal and generate a comparison signal. Additionally, the system includes a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal, and a switch configured to receive the modulation signal and control an input current for a power converter. The input current is associated with an output power for the power converter. The cycle threshold corresponds to a threshold power level for the output power. The threshold power level is constant, decreases, or increases with respect to the input signal.
    Type: Application
    Filed: February 14, 2008
    Publication date: September 4, 2008
    Applicant: On-Bright Electronics (Shanghai) Co.
    Inventors: Zhen Zhu, Jun Ye, Shifeng Zhao, Lieyi Fang, Zhiliang Chen
  • Patent number: 7218496
    Abstract: The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error amplifier. When V1>Vth, the error amplifier senses an overcurrent condition to provide feedback to the operational amplifier to limit an output current. The second sensor circuit includes a second transistor, a second resistor, and a sensing transistor. When the output current exceeds a sense threshold current, the sensing transistor is turned ON to provide feedback to the operational amplifier 12 to limit the output current. The second sensor circuit has a higher setting of sense threshold current than does the first sensor circuit, while having a higher setting of sensing speed than does the first sensor circuit.
    Type: Grant
    Filed: July 14, 2005
    Date of Patent: May 15, 2007
    Assignee: Rohm Co., Ltd.
    Inventor: Atsushi Kitagawa
  • Patent number: 7170732
    Abstract: A surge current delay time period is added to a current limit delay time period in order to permit a longer time for a possibly temporary larger-than-steady-state electrical current, such as for a start-up power requirement. A system is described for permitting a legitimate surge current by distinguishing true over-current fault conditions from temporary surges in terms of high current duration time.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: January 30, 2007
    Assignee: Micrel Incorporated
    Inventors: David Andersen, Thruston Awalt
  • Patent number: 6985784
    Abstract: There is provided a computer-implemented method for configuring a centralized circuit breaker protection system. The method includes determining configuration data for a processor in the centralized circuit breaker protection system in accordance with a parameter relating to an operation of the centralized circuit breaker protection system, and configuring the processor with the configuration data. There is also provided an apparatus for configuring a centralized circuit breaker protection system, and a storage media containing instructions for controlling a computer for configuring a centralized circuit breaker protection system.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: January 10, 2006
    Assignee: General Electric Company
    Inventors: John S. Vandevanter, Thomas F. Papallo, Ellen E. Spahr
  • Patent number: 6798630
    Abstract: The electronic trip device includes a processing unit having inputs to receive electrical signals representative of electrical quantities and an output to supply a tripping signal to a tripping relay, and a man-machine interface connected to the processing unit to supply setting parameters and to display information and tripping curves on a screen. The man-machine interface includes display means displaying setting parameters which modify the visual aspect of at least one portion of curve representative of a parameter whose setting is being adjusted. The circuit breaker includes such a trip device connected to current sensors and to contacts to interrupt currents in electrical conductors.
    Type: Grant
    Filed: August 3, 2000
    Date of Patent: September 28, 2004
    Assignee: Square D Company
    Inventors: Alain Del Vecchio, François Vincent, Luc Weynachter
  • Patent number: 6788513
    Abstract: A switching power supply circuit is protected from degradation and breakage of a MOS transistor when the inductive load is short-circuited or overloaded. To do this, the magnitude of the load current flowing through the MOS transistor is detected by a differential amplifier as a voltage drop due to the on resistance of the MOS transistor, a first latch circuit is set by the detection output of the differential amplifier generated when the voltage drop exceeds a predetermined value, and the first latch circuit is reset by the output of a control signal generating circuit controlling the MOS transistor. Current supplies from two constant current sources are switched between in accordance with the output of the first latch circuit to charge and discharge a capacitor for timer time setting. Then, the charging voltage of the capacitor is detected by a comparator, and a second latch circuit is set by the output of the comparator generated when the charging voltage exceeds a predetermined value.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: September 7, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuhito Kimura
  • Patent number: 6788514
    Abstract: Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one embodiment, one or more off-times following detection of a fault condition is smaller than subsequent off-times.
    Type: Grant
    Filed: May 8, 2003
    Date of Patent: September 7, 2004
    Assignee: Power Intergrations, Inc.
    Inventor: Balu Balakrishnan
  • Patent number: 6683766
    Abstract: A circuit and method are disclosed for detecting an imminent arc prior to the ignition of the arc in a system having a DC power supply that provides power to a load through a conductor. The inventive circuit includes a current-change detector that detects a sudden drop in current through the conductor that is indicative of an imminent arc. Upon detection of a sudden drop in current through the conductor, a multivibrator generates a pulsed signal, wherein the width of the pulse is indicative of a determined period of time for which the power supply should be disconnected to prevent ignition of an arc. The pulsed signal controls a transistor, which selectively disconnects the power supply from the load for a determined period of time in response to the pulsed signal.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: January 27, 2004
    Assignee: Yazaki North-America, Inc.
    Inventors: Sam Yonghong Guo, James L. Jones, III, Ansel Strickland Dooley
  • Publication number: 20030197994
    Abstract: Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one embodiment, one or more off-times following detection of a fault condition is smaller than subsequent off-times.
    Type: Application
    Filed: May 8, 2003
    Publication date: October 23, 2003
    Inventor: Balu Balakrishnan
  • Patent number: 6633474
    Abstract: The instantaneous tripping threshold of the selective tripping device is a decreasing function of a quantity representative of the time necessary for the current to reach the peak value. The variation curve is disposed between first and second curves, obtained experimentally, representative of envelopes of the peak current values. The first curve is obtained when the circuit breaker associated to the selective tripping device is alone and the second curve when it is connected in series with another circuit breaker connected down-line.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: October 14, 2003
    Assignee: Schneider Electric Industries SA
    Inventor: Dominique Boudaud
  • Patent number: 6625551
    Abstract: A fault or differential current detection system is provided. The detection system detects a fault or differential current generated on a conductive path supplying power to an electric device and prevents the fault or differential current from being supplied to the electric device. The detection system comprises a detector, a switch, and a controller. The detector detects a detected current generated on the conductive path and outputs a corresponding detection signal. The controller inputs the detection signal and determines if the detected current is greater than or equal to a first predetermined current threshold based on the detection signal. Then, the controller refrains from outputting a control signal to the switch for a predetermined delay period after the detected current becomes greater than or equal to the first predetermined current threshold.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: September 23, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Gies, Reinhard Schmid
  • Patent number: 6580593
    Abstract: Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one embodiment, one or more off-times following detection of a fault condition is smaller than subsequent off-times.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: June 17, 2003
    Assignee: Power Integrations, Inc.
    Inventor: Balu Balakrishnan
  • Publication number: 20020191361
    Abstract: The trip device comprises a system-powered power supply circuit comprising a capacitor for power supply of a trip coil. When the trip device is powered on, the capacitor charges and its voltage is regulated according to a first reference voltage sufficient to activate the trip coil if necessary. After a preset period, regulation of the voltage at the terminals of the capacitor is performed according to a second reference voltage, lower than the first voltage. The reference voltage reverts to the first value during the same preset period when the measured current reaches a preset threshold, which constitutes an indication of the presence of a fault that will lead to tripping being required. The capacitor is therefore generally charged at a lower voltage than that which is necessary for tripping, thus enabling its size to be reduced.
    Type: Application
    Filed: April 25, 2002
    Publication date: December 19, 2002
    Applicant: Schneider Electric Industries S.A.
    Inventor: Pascal Houbre
  • Patent number: 6385022
    Abstract: A protective relay that derives and processes power system data from multiple user-configurable data source points. Data from multiple source points can be combined in the relay as a single source of data useful to perform a wide variety of monitoring and protection tasks. Multiple digital signal processing modules can be used to provide additional processing resources, including the ability to provide protection and revenue-class metering in a single device.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: May 7, 2002
    Assignee: General Electric Company
    Inventors: Ara Kulidjian, Jeff Mazereeuw
  • Patent number: 6324041
    Abstract: A protection circuit (30) for a Traveling Wave Tube having multiple tone operation. The protection circuit (30) is a dual sensor (52, 54) arrangement. One sensor (52) is an operational amplifier circuit (56) having a short time constant and a high threshold current. The first sensor (52) provides protection against short time scale faults. The second sensor (54) is an operational amplifier circuit (58) having a time constant higher than the first sensor (52) and a lower current threshold than the first sensor (52) to provide protection against long time scale events. The two sensors (52 and 54) are logically “OR”ed with each other and eliminate spurious shutdowns and circuit damage.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: November 27, 2001
    Assignee: Hughes Electronics Corporation
    Inventors: Dan M. Goebel, David E. Lewis, Ronglin Liou
  • Patent number: 6297939
    Abstract: A circuit breaker system 10 using electronic trip units 35. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer 20. Further, the electronic trip units are coupled to a separate control power supply line 50 and to a zone selective interlock system 70 . The zone selective interlock system 70 is configured to provide tripping delays to circuit breakers located upstream from a detected fault.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: October 2, 2001
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: Mario Bilac, Charles Randall Dollar, II
  • Patent number: 6279115
    Abstract: A circuit arrangement is described for monitoring an electronic tripping device for low-voltage switches having a microprocessor device which, in conjunction with a digital-analog converter, evaluates an overcurrent so that line power supply system. The microprocessor device (MPE) has a zero crossing comparator with which a constant test current pulse is transmittable, at zero crossings, to the electronic tripping device via an additional current transformer winding to measure the amplitude. In the case of deviations from the setpoint value, (re)calibration or actuation of the line tripping contacts, with an alarm signal being emitted, takes place.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: August 21, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ulrich Baumgärtl, Wolfgang Röhl
  • Patent number: 6195243
    Abstract: A system including a load center monitor (10) connected to a plurality of digitally enhanced circuit breakers (40) by a communication bus (26) forms a network of reconfigurable circuit breakers which provides advanced monitoring and control of an electrical power distribution system. A user port (20) and a service port (22) provide a communication interface with an external computer. Visual indicators (34) and an audible alarm (30) provide for alerting persons to certain conditions in the system. Buttons are provided for CLEAR (38), RESET (36), and TEST functions, and a diagnostic port (24) is also provided. The load center monitor (10) is operable to monitor the operation of the circuit breakers (40) and download information therefrom for storage in the load center monitor (10) as in the form of historical data.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: February 27, 2001
    Inventors: George Auther Spencer, LeRoy Blanton, Robert Henry Clunn
  • Patent number: 6175479
    Abstract: The present invention involves a power circuit breaker that conditionally and temporarily enables instantaneous trip protection. A position sensor senses whether the breaker contacts are open or closed. When the breaker contacts are open, the circuit breaker enables the instantaneous trip protection. After the circuit breaker contacts are closed, the circuit breaker continues to enable the instantaneous trip protector for a predetermined period of time. After this time delay, the circuit breaker disables the instantaneous trip protection and the circuit breaker reverts to providing its ordinary protection, such as long-time or short-time protection.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: January 16, 2001
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: Donald R. Boyd, David Michael Cooper
  • Patent number: 6141197
    Abstract: A circuit interrupter of the type including an electronic trip unit for overcurrent determination includes a separate circuit to power the trip unit along with a Hall Effect or GMR Device to sense the current flow within the protected circuit. A removable option plug electrically interconnects with the trip unit to enable ground fault and arcing fault protection.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: October 31, 2000
    Assignee: General Electric Company
    Inventors: Edward E. Kim, John J. Dougherty, Esteban Santos, David Arnold, Richard E. Saunders, Ronald D. Ciarcia, James I. Smith, Richard A. Menelly
  • Patent number: 6069780
    Abstract: The electronic trip device comprises in series for each phase of a power system a sampler, a squaring circuit and a finite impulse response (FIR) filter. A maximum circuit is connected to the output of the FIR filters and to the input of an infinite impulse response filter. A comparison circuit for comparison to thresholds is connected to the output of the IIR filter. It is thus possible to obtain both a good precision and good filtering of the harmonics of the frequencies of conventional power systems (50 Hz, 60 Hz and 400 Hz), and to reduce the necessary computing power, and consequently the cost of the trip device.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: May 30, 2000
    Assignee: Scheinder Electric Sa
    Inventors: Alain Del Vecchio, Hong Nguyen
  • Patent number: 6067218
    Abstract: The trip device comprises a processing unit which gives a tripping order according to the value of the current supplied by current sensors, and to threshold and time delay values defined by setting devices. The setting devices connected to the processing unit comprise multiple contacts. The contacts supply an encoded binary value representative of each position of the setting device. To prevent operating errors between two positions, only one of the contacts changes state between two successive positions. The value supplied by the setting device is the value corresponding to the immediately lower position or to the immediately higher position. The code representative of each position can follow, for example, the order of GRAY encoding.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: May 23, 2000
    Assignee: Schneider Electric S.A.
    Inventor: Eric Suptitz
  • Patent number: 6018300
    Abstract: Faults occurring in a telecommunications system are monitored identifying their time of onset and reporting them to an operator through an interface if they have not cleared within a predetermined interval. Transient faults, which do clear within that interval, are not reported directly, but only if such faults occur more frequently than a predetermined rate. This is determined by establishing a scan interval, and an analysis period equal to a plurality of scan intervals, monitoring the system continuously for the occurrences of faults, and storing their times of occurrence in a store. At the end of each scan interval, the number of occurrences of the fault during the analysis period which ends at the end of the scan interval are counted by a counter. If the number of occurrences of the fault in the analysis period is equal to or greater than a threshold value selected by user input, an alarm indicator is activated.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: January 25, 2000
    Assignee: British Telecommunications public limited company
    Inventors: Antionette Dowden, Michael J Edwards, Steven J Chapman, Michael O'Malley
  • Patent number: 5995347
    Abstract: A multi-function protection system (8) for protecting electrical equipment such as a screw compressor motor is shown having a housing (10, 20) mounting current sensing toroids (CT1, CT2, CT3) and associated circuitry as well as associated circuitry for temperature sensing PTC resistors (S1, S2, S3) adapted to be placed in heat conductive relation with respective windings of the motor. The circuitry is connected to an analog-to-digital converter or ADC (U6) which provides a binary coded input to a micro-controller (U5). The micro-controller performs protection sub-routines to control an output switch (Q4) which in turn controls the state of energization of a relay (K1) coupled to the screw compressor motor.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: November 30, 1999
    Assignee: Texas Instruments Incorporated
    Inventors: Jeffrey P. Rudd, Byron T. Yarboro
  • Patent number: 5943201
    Abstract: Trip profiles for electrical switches such as circuit breakers and overload relays can be generated, and when appropriate, coordinated, in a remote processor such as a personal computer. The profiles, with the addresses of the associated electrical switches are transferred into non-volatile memory in a portable unit. This portable unit is transported to the site of the electrical switches where it is interfaced with the appropriate electrical switch for loading of the assigned profile into the switch. In addition, the profiles stored in the electrical switches can be loaded into the portable unit for transport back to the remote unit for verification and/or modification.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: August 24, 1999
    Assignee: Eaton Corporation
    Inventors: Christopher G. Walker, James I. Wise
  • Patent number: 5808844
    Abstract: A current differential protection arrangement for an electric power supply unit with a measured value pre-processing device and an analysis device that checks on the basis of a predefined dependence of a differential current on a stabilizing current (response characteristic curve) to determine whether the differential and stabilizing current values thus formed are in a blocking range or a triggering range, where an additional stabilization range is present in the blocking range. To avoid fixed-time blocking after an external fault with transformer saturation with such a protection arrangement, the analysis device in a stabilizing circuit contains a testing arrangement which checks the current values thus formed to determine whether they describe a point in the additional stabilization range. If this is the case, a blocking signal is produced, which activates the blocking device downstream from the testing arrangement.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: September 15, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ludwig Schiel, Steffen Noack, Norbert Schuster
  • Patent number: 5793595
    Abstract: A microprocessor-based multifunction overcurrent relay for protecting power systems has a plurality of overcurrent elements implemented in a software program. Sufficient overcurrent elements are provided to accomplish a selected one of three independent applications, including feeder protection, motor protection, or breaker failure protection. The relay includes elements for selecting one application by the user from the three possible applications and produces output signals when an overcurrent condition is determined.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: August 11, 1998
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Stanley E. Zocholl
  • Patent number: 5764460
    Abstract: A circuit for protecting from overload currents includes an electronic power device having at least first and second terminals and at least one control terminal. The circuit also includes at least one voltage-generating circuit for generating a reference voltage having a predetermined pattern. The voltage-generating circuit includes at least a first terminal connected to the first terminal of the power device and at least a second terminal coupled to the second terminal of the power device through a sensor. The circuit also preferably includes at least one comparator for comparing the reference voltage with a voltage present across the sensor. The comparator has at least one output terminal and at least first and second input terminals. The first and second input terminals are respectively connected to a third terminal of the voltage-generating circuit and the second terminal of the power device.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: June 9, 1998
    Assignee: Co.Ri.M.Me-Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
    Inventors: Leonardo Perillo, Giuseppe Scilla
  • Patent number: 5710690
    Abstract: A non-dissipative device for protecting an integrated circuit having multiple independent channels against overloading. The non-dissipative device includes an input terminal and an output terminal having an integrated switch connected therebetween which consists of an input portion, a logic gate with two inputs a control portion, and an output portion, all connected in series with one another. The device further includes a generating circuit for generating the on-times and off-times of the integrated switch, the generating circuit is connected between an output of the output portion and an input of the logic gate.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: January 20, 1998
    Assignee: Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
    Inventors: Gregorio Bontempo, Francesco Pulvirenti, Paolo Colletti, Roberto Gariboldi