With Thermistor Sensor Patents (Class 361/27)
  • Patent number: 9479091
    Abstract: A circuit for thermal protection and power regulation as a function of the current winding temperature of phase windings of an electric motor. The circuit including at least one temperature monitor switch (TW1, TW2) that measures the winding temperature of the phase windings, and that upon attainment of a specific winding temperature shuts off the winding current flowing through the windings, the circuit further including a PTC thermistor that is associated with the phase windings and that, upon attainment of a specific winding temperature, reduces power by means of a resistance increase, or shuts the motor off. One of the phase windings has the PTC thermistor. The other phase windings or winding has a temperature monitor switch. The PTC thermistor and the temperature monitor switch or switches (TW1, TW2) are connected in series to a voltage source.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: October 25, 2016
    Assignee: ebm-papst Mulfingen GmbH & Co. KG
    Inventor: Thomas Sauer
  • Patent number: 9347837
    Abstract: An integrated circuit for implementing brushless DC motor control includes a substrate, a band gap temperature sensor, and a magnetic sensor. The substrate has a temperature output pin for connection to an external device and a magnetic sensor output pin for connection to the external device. The band gap temperature sensor is formed on the substrate and is configured to sense temperature and supply a temperature signal representative of the sensed temperature to the temperature output pin. The magnetic sensor is formed on the substrate and is configured to sense magnetic field variations and supply a sensor output signal representative thereof to the magnetic sensor output pin.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: May 24, 2016
    Assignee: Honeywell International Inc.
    Inventors: Richard Kirkpatrick, Joshua Jacque Edberg, Fred W. Hintz, Lamar Floyd Ricks, Gregory Furlong
  • Publication number: 20150103450
    Abstract: There is disclosed an apparatus and method for protecting an electrical device. The electrical device is coupled to a power source, and an electric load, a sensor, and a controller. The controller is configured to shut off the electrical device if certain sensed thermal values exceed predetermined values.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 16, 2015
    Inventors: Christoffer S. Fox, Adam E. Anders, David R. Seidl, Robert T. Burman
  • Patent number: 8964338
    Abstract: A system includes a refrigerant compressor including an electric motor, a current sensor that measures current flow to the electric motor, a switching device configured to close and open to allow and prevent current flow to the electric motor, respectively, a maximum continuous current (MCC) device that includes a resistance corresponding to a maximum continuous current for the electric motor, and a motor protection module. The motor protection module communicates with the MCC device, the current sensor, and the switching device and determines a first MCC value for the electric motor as a function of the resistance of the MCC device. The motor protection module also selectively sets a predetermined MCC to the first MCC and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: February 24, 2015
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Frank S. Wallis, Joseph James Rozsnaki
  • Patent number: 8558513
    Abstract: A safety circuit includes a thermal fuse electrically connected in a main current path so that an electric current flowing in the main current path flows, through the thermal fuse; a switching element electrically connected to the thermal fuse to cause the thermal fuse to open and interrupt the electric current flowing in the main current path when the switching element is turned on; a microcontroller electrically connected to the switching element and the main current path to turn on the switching element when an overcurrent flows in the main current path; and a noise removing unit electrically connecting the microcontroller to the switching element.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: October 15, 2013
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Youngbok Kim
  • Patent number: 8547696
    Abstract: A latch module and an electronic device using the same are provided. The electronic device includes the latch module as well as first and second bodies that are opened and closed relative to each other. The latch module in the first body includes a pressing member, a linking member, and a latch. The pressing member is movably configured in and passes through the first body along a first axis. The linking member is pivoted to the first body. The pressing member leans against the linking member. The latch is configured in the first body along a second axis. The linking member leans against the latch. The pressing member moves relative to the first body along the first axis to press and rotate the linking member relative to the first body. Thus, the linking member presses the latch to move relative to the first body along the second axis.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: October 1, 2013
    Assignee: Inventec Corporation
    Inventor: Yun-Tang Lin
  • Patent number: 8288902
    Abstract: A thermistor device configures part of an electrical path from a motor feeder section to an armature. A recess defining wall defines an accommodating recess, which accommodates the thermistor device. The thermistor device includes a plate-like thermistor element. A first conductive plate and a second conductive plate sandwich the thermistor element. A pair of first projections 22b are provided at the distal end of the first conductive plate in the insertion direction. A pair of second projections 23b are provided at the distal end of the second conductive plate in the insertion direction. The first projections and the second projections abut against the recess bottom wall in a range that corresponds to the thermistor device except the thermistor element.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: October 16, 2012
    Assignee: ASMO Co., Ltd.
    Inventors: Kazuma Shibata, Yasuhiro Fukatsu, Ryousuke Sakamaki, Manabu Kato
  • Patent number: 8248739
    Abstract: An electrical switching apparatus is for another apparatus including a number of insulators, a number of temperature sensors operatively associated with the number of insulators, and a number of conductors operatively associated with the number of insulators. The electrical switching apparatus includes a number of separable contacts, an operating mechanism structured to open and close the separable contacts, a number of sensors structured to sense a number of currents flowing through the separable contacts and through the conductors, a processor structured to input the sensed currents from the sensors, and an output. The processor calculates at least one of: (a) a thermal age of the other apparatus from a number of sensed temperatures from the temperature sensors, and (b) the thermal age of the other apparatus from the sensed currents. The output includes the thermal age of the other apparatus.
    Type: Grant
    Filed: July 24, 2009
    Date of Patent: August 21, 2012
    Assignee: Eaton Corporation
    Inventor: Lawrence B. Farr
  • Patent number: 8085514
    Abstract: A modular control assembly is provided for on-machine control of a desired machine. One embodiment has a machine mountable base and a replaceable control unit, wherein the machine mountable base has a machine protection device. In various embodiments of the machine mountable base, the machine protection device may have a short-circuit protective device and a disconnect device. In addition, various embodiments of the replaceable control unit may have a variable frequency drive, a soft start device, or an adjustable overload protection device.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: December 27, 2011
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Brian J. Taylor
  • Patent number: 8084967
    Abstract: A motor controller is provided. The motor controller includes a motor drive unit that drives a plurality of motors; a thermal shutdown unit that is provided in the motor drive unit and that stops the plurality of motors in the case of an overload; a lock signal generation unit that generates a lock signal corresponding to a respective one of the plurality of motors when a rotational speed of the respective motor reaches a threshold speed set for the respective motor; and an operation determination unit which, when the lock signal generation unit interrupts lock signals for all of the plurality of motors, determines that thermal shutdown unit has operated.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: December 27, 2011
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Atsushi Tanaka
  • Patent number: 8049469
    Abstract: A safety circuit includes a thermal fuse electrically connected in a main current path so that an electric current flowing in the main current path flows through the thermal fuse; a switching element electrically connected to the thermal fuse to cause the thermal fuse to open and interrupt the electric current flowing in the main current path when the switching element is turned on; a microcontroller electrically connected to the switching element and the main current path to turn on the switching element when an overcurrent flows in the main current path; and a noise removing unit electrically connecting the microcontroller to the switching element.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: November 1, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Youngbok Kim
  • Patent number: 7970650
    Abstract: A POS device includes a rotation shaft vertically fixed, a rotary plate provided so as to be rotatable about the rotation shaft, a rotating portion placed on the rotary plate and having at least a barcode scanner and a receipt printer, and a display device for clerk and a display device for customer both provided at the top end of the rotation shaft.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: June 28, 2011
    Assignee: NEC Infrontia Corporation
    Inventor: Mitsuhiro Tokorotani
  • Patent number: 7954334
    Abstract: An inverter system having a semiconductor device, and a railway vehicle using this inverter, provide a more accurate determination of whether an abnormal heat generation from the inverter is associated with an error of the inverter system or is due to other causes, by use of a plurality of temperature detecting elements at a plurality of sites associated with the semiconductor device. An error detection section applies inputs from the temperature detecting elements, captures a trend of the differential value based on the plurality of temperature inputs using period sampling wherein an error associated with the semiconductor device, and not from some other condition such as outside environment temperature, is determined based on differences from, or a change in, the initial trend.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masataka Sasaki, Hideki Miyazaki, Katsumi Ishikawa, Keiji Maekawa
  • Patent number: 7839108
    Abstract: A temperature estimation controller and methods are provided for controlling a torque command to prevent overheating of one or more of a plurality of phases of a permanent magnet motor. The temperature estimation controller includes a low speed temperature estimation module, a transition module and a temperature dependent torque command derater block. The low speed temperature estimation module determines a stator temperature of each of a plurality of phases of the permanent magnet motor in response to first thermal impedances measured for each of the plurality of phases with respect to a thermal neutral. The transition module is coupled to the low speed temperature estimation module and outputs the stator temperature of each of a plurality of phases of the permanent magnet motor as determined by the low speed temperature estimation module when a detected speed of the permanent magnet motor is less than a first predetermined speed.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: November 23, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Nitinkumar R. Patel, Yo Chan Son, Silva Hiti, Steven E. Schulz
  • Patent number: 7800872
    Abstract: Provision is made for a switch-state monitoring device that not only monitors the state of a switch but also prevents a motor burnout. A switch-state monitoring device for a switch that opens and closes a main circuit by use of a motor is provided with an operating time measuring unit for detecting an operating time for the motor when the switch is opened or closed; a first determination unit for comparing an operating time for the motor detected by the operating time measuring unit with an continuous-operating-capable setting time for the motor and determining whether or not the operating time for the motor has exceeded the continuous-operating-capable setting time; a protection device for halting energization of the motor in the case where, based on an output of the first determination unit, it is determined that the operating time for the motor has exceeded the continuous-operating-capable setting time.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: September 21, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masahiro Arioka, Yasushi Takeuchi
  • Publication number: 20090085446
    Abstract: A generator-motor apparatus includes a control circuit, an alternator, electrode plates, and switching devices. The electrodes plates have a substantial horseshoe shape, and are provided on an end surface of the alternator so as to surround a rotating shaft of the alternator. Each of the switching devices is formed by sandwiching a MOS transistor between two electrodes, and has a can structure for sealing the internal space of the switching device using a resin. The switching devices are directly attached to the electrode plate by means of soldering, and the switching devices are directly attached to the electrode plate by means of soldering. The control circuit controls the switching devices. The switching devices drive the alternator as an electric motor or an electric power generator.
    Type: Application
    Filed: November 5, 2008
    Publication date: April 2, 2009
    Inventor: Katsunori YAGI
  • Patent number: 7486490
    Abstract: An actuator for a clutch or gear mechanism in a motor vehicle comprises an electric motor and an incremental encoder. The encoder comprises a position measurement signal output at which a position measurement signal can be output which has a number of different signal states, each of which is assigned to a relative position between a primary part and a secondary part of the electric motor. For the commutation of the electric motor, the position measurement signal output is connected to a position measurement signal input of a control device for a motor winding of the electric motor. The control device comprises a device for checking the plausibility of the position measurement signal and is designed in such a manner that on the occurrence of an implausible signal state the power supply to the electric motor is disconnected and/or the power of the electric motor is limited.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: February 3, 2009
    Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG
    Inventors: Thomas Pfund, Wai-Wal Buchet, Sven-Jostein Kro, Martin Zimmermann, Juergen Gerhart, Martin Fuss
  • Patent number: 7362550
    Abstract: Disclosed is an electric motor comprising a temperature monitoring device which is provided with at least two temperature sensors that have different temperature characteristics and are connected to terminal clamps by means of electrical wires, whereby it is possible in an advantageous manner to connect regulating devices having different temperature sensor input characteristics to the electric motor.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: April 22, 2008
    Assignee: Rexroth Indramat GmbH
    Inventors: Ingolf Groening, Bernd Schnurr
  • Publication number: 20080074069
    Abstract: Thermistor monitoring arrangement of an alternating-current electric motor controlled by a power transformer, such as a frequency converter, for at least one thermistor monitoring the temperature of the motor, in which is a power transformer (200), in which is a power stage (203) and a control unit (204), controlling an alternating-current electric motor (201) provided with a thermistor (202), and into which power transformer, such as a frequency converter, an input circuit connected to a thermistor located in the motor is integrated, to which input circuit a safety circuit (a so-called Safe Stop circuit) that prevents unexpected starting or ensures safe stopping of the frequency converter is connected.
    Type: Application
    Filed: September 19, 2007
    Publication date: March 27, 2008
    Inventors: Kimmo Rajakangas, Paavo Merilinna, Hans Carlsson
  • Patent number: 7049518
    Abstract: A shielded cable has a cable body providing an electromagnetic shielding portion around a conductive wire thereof, a connector fitted to one end of the cable body and having a casing including a conducting portion, and an electromagnetic shielding portion of the cable body conducted with the conducting portion of the casing in the connector. The shield conducting portion is provided on the conducting portion and includes first and second conducting members, which are located outside the electromagnetic shielding portion by being press-fitted into the casing for pressing the electromagnetic shielding portion in different directions, respectively. At least one of the first and second conducting members is made of a conductive material. The cable body is held by the first and second conducting members, so that the electromagnetic shielding portion is conducted with the conducting portion of the casing through the conducting member made of a conductive material.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: May 23, 2006
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Kazuya Kimura, Ken Suitou, Akio Fujii
  • Patent number: 7005827
    Abstract: A starting circuit for a single-phase induction motor includes a motor starting positive characteristic thermistor and a triac arranged in a series connection, and a triac control positive characteristic thermistor connected in parallel with the motor starting positive characteristic thermistor, and including one terminal thereof connected to a gate of the triac. The triac control positive characteristic thermistor has a volume in the range of about 4.5 mm3 to about 30 mm3. The relationship of (?2×V×sin 45°)/R?I is maintained with the triac control positive characteristic thermistor within an operating temperature range, where V represents a root-mean-square value of a power source voltage, R represents a resistance of the triac control positive characteristic thermistor, and I represents a gate turn-on current of the triac. The gate turn-on current I at an operating temperature of about 25° C. is about 20 mA or less.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: February 28, 2006
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yutaka Ikeda, Hiroki Tanaka, Toshiharu Hirota
  • Patent number: 6989976
    Abstract: A resistance value variable element (18a) changes its resistance value in response to abnormal exothermic heat caused by an overcurrent of an external electrical equipment (3). A bias voltage outputted from a bias voltage output circuit (18) changes in accordance with the change of the resistance value. A relay (13) is controlled so as to be opened/closed in accordance with a switching control signal which is controlled in its supply by a second transistor element (17) based on the change of the bias voltage. According to such a control, power interruption and automatic restoring can be made possible. In the overcurrent protection circuit having such an automatic restoring function, the resistance value variable element is not connected in series with a coil (13a) unlike the conventional technique but contained in the bias voltage output circuit for supplying the switching control signal for exciting the coil.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: January 24, 2006
    Assignee: Yazaki Corporation
    Inventor: Hiroyuki Ashiya
  • Patent number: 6847187
    Abstract: A thermal protection apparatus for an AC traction motor including a stator, a rotor, a blower fan and an inverter includes a method and apparatus for predicting the motor temperature assuming that the blower is operational. The method and apparatus also determines an estimated motor temperature by measuring the motor resistance or the rotor slip. The estimated motor temperatures compared to the predicted motor temperature to determine the condition of the motor cooling system.
    Type: Grant
    Filed: January 8, 2004
    Date of Patent: January 25, 2005
    Assignee: General Electric Company
    Inventor: Ajith Kuttannair Kumar
  • Patent number: 6542846
    Abstract: A thermal management system for a portable battery powered electronic device, and particularly, a portable battery powered ultrasound device, which controls the temperature of the device such that the external surface temperature satisfies medical safety regulatory requirements, and such that the heat generated by the device does not reduce battery life, reduce component life, decrease reliability of the device, or cause device shutdown because of overheating. A thermal management system monitors the respective temperatures of various system components, and, based on the monitored temperatures, performs control to cool the ultrasound system, maintaining the external surface temperature below the safety regulated temperatures and ensuring reliability of system components.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: April 1, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: David G Miller, Joseph R Fallon, Dennis J. Buckley, Michael Hoar, Daniel Gerard Maier
  • Patent number: 6490158
    Abstract: A motor start capacitor assembly for providing an enclosure for a motor start capacitor and a thermistor electrically connected in series. The enclosure is constructed of a low temperature plastic case and cap with a high temperature plastic core for supporting the thermistor within the low temperature plastic case. The core holds the thermistor in a longitudinal orientation. The core and thermistor and related contacts are assembled without rivets or other fasteners.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: December 3, 2002
    Assignee: Diversitech Corporation
    Inventors: Scott Clinn Ellyson, Charles Barry Ward
  • Patent number: 6452359
    Abstract: An improvement in a starting system for an electric motor, which drives a hermetic compressor of refrigeration and comprises a main winding (1), and an auxiliary winding (2), which are energized by an electric current source (3), through a hermetic terminal (40) affixed to the outside of the compressor shell, the auxiliary winding (2) having a terminal connected to the electric current source (3) through a starting device (10) mounted inside the compressor shell and in series with a fusible element (20) to be opened when submitted to an electric current, in order to definitively interrupt the energization of the auxiliary winding (2) by means of the starting device (10), said hermetic terminal (40) being designed to receive an external starting device (50), in order to promote the selective connection between said other terminal of the auxiliary winding (2) and the electric current source (3) upon the definitive opening of the circuit defined by the fusible element (20) and the starting device (10).
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: September 17, 2002
    Assignee: Empresa Brasileira de Compressores S/A Embraco
    Inventors: Marcos Guilherme Schwarz, Egidio Berwanger
  • Patent number: 6317304
    Abstract: An assembly of starting elements and protectors for use with electric motors. One of the objectives is to provide an assembly which can be quickly and easily adapted to the housing of a compressor. This objective is achieved by the assembly comprising a capsule having a base (1) and a cover (2) that can be fitted onto the base, a PTC element (80) disposed in the capsule and a motor protector (9) that can be fitted into the capsule in the fitted position of the cover onto the base, the capsule can be received on pins of a terminal connector of a convention compressor.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: November 13, 2001
    Assignee: Texas Instrumentos Electronicos do Brasil LTDA.
    Inventor: José Paulo Seidenthal De Campos
  • Patent number: 6249104
    Abstract: A motor start switch includes a temperature responsive resistor element and a cutout switch electrically connected in series with a start winding of an electric motor. The cutout switch is in thermal contact with the temperature responsive resistor element so that heat from the temperature responsive resistor element is transferred to a bimetal element in the cutout switch, causing the bimetal element to open the switch. Heat from a motor overload protector provides heat to maintain the bimetal element in an open position. As heat to operate the temperature responsive resistor element is obtained from existing circuit elements, the efficiency rating of the motor is unaffected.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: June 19, 2001
    Assignee: General Electric Company
    Inventor: Alan Joseph Janicek
  • Patent number: 6236550
    Abstract: A positive thermistor device used in a motor activating circuit device of a refrigerator for example includes a positive thermistor element having a pair of opposed electrodes, each of which receives compressive force elastically applied from a corresponding one of spring contact members to hold the thermistor element at a predefined position in the device. When the thermistor device is destroyed, the element breaks into fragments, some of which remain in contact with the spring contact members. The remaining fragments deviate in position to ensure that they do not conduct electricity, resulting in an open state, wherein any current flow is inhibited through such fragments. More specifically, a positive thermistor disk is held within the device so that it is interposed between conductive spring contact pieces and insulative position-alignment projections, which are cross-diagonally situated with respect to each other.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: May 22, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Norihiro Mochida, Yoshihiro Yamada, Haruo Takahata
  • Patent number: 6169648
    Abstract: An electronic motor protection system which protects electric motors against various fault conditions such as over-temperature (12) of the individual windings of the motor and low voltage (18, 20). The system has a power supply compatible with 24, 120 or 240 VAC input voltage using only two input terminals. According to a first embodiment, line voltage is inputted to a transformer (T1) while the combination of a zener follower (Z1, Z2, Q1) and series regulator (U1, Q2, Q3) provide independent DC voltage supply levels or voltage rails (VR1, VR2) for control circuitry over a wide range of input voltages. A dead-band voltage range is provided by a circuit section (20) which works in conjunction with a 240 volt, low voltage cut-out circuit section (18) to prevent the possibility of chatter in 240V motors and excessive voltage from being applied to 120 volt motors.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: January 2, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Kerry J. Denvir, Joseph G. Nield, Jr.
  • Patent number: 6107669
    Abstract: An intelligence power device (IPD), having a temperature-sensitive and heat-damage protecting function, is used as a semiconductor relay which controls load current supplied to an electric load. A target sensitive temperature T.sub.SD of IPD is determined according to an allowable load current value, using an equation T.sub.SD =I.sup.2 .times.R.sub.ON .times.R.sub.TEMP +T.sub.ROOM, where I represents an allowable load current value, R.sub.ON represents an on-resistance value of a power MOSFET, R.sub.TEMP represents a thermal resistance value of an entire radiation system of IPD, and T.sub.ROOM represents an ambient temperature of IPD. When the load current exceeds the allowable load current value, IPD stops the load current so that the load circuit can be prevented from being subjected to excessively large current.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: August 22, 2000
    Assignee: Anden Co., Ltd.
    Inventors: Hirofumi Mokuya, Mutuo Taniguchi
  • Patent number: 6090735
    Abstract: A semiconductive ceramic composition having negative resistance-temperature characteristics, wherein the composition comprises lanthanum cobalt oxide as the primary component, and, as secondary components, at least one oxide of an element selected from B, Fe and Al and at least one oxide of an element selected from Si, Zr, Hf, Ta, Sn, Sb, W, Mo, Te, Ce, Nb, Mn, Th and P. A semiconductive ceramic composition having a resistivity of approximately 10 .OMEGA..multidot.cm to 100 .OMEGA..multidot.cm at room temperature is obtained by controlling the amount of additives. Since the resistivity at room temperature can be enhanced to several times or more that of the conventional compositions while characteristics of the conventional compositions are maintained, the composition may be widely applied to control heavy current.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: July 18, 2000
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Akinori Nakayama, Terunobu Ishikawa, Hideaki Nimi, Ryouichi Urahara, Yukio Sakabe
  • Patent number: 5867083
    Abstract: A small-size high-performance electronic protective device (10) is provided for use in protecting communication equipment including an exchange servicing module against application of abnormal surge current due to accidental shorts between adjacent ones of power feed lines in a communications system. The protective device (10) includes positive thermistors (3a, 3b) connected between communication link input terminals (1a, 1b) and output terminals (1c, 1d) coupled to an associative equipment being protected. The protective device (10) also includes thick-film resistive elements (5a, 5b), which are connected in parallel with the thermistors (3a, 3b), respectively.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: February 2, 1999
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Haruyuki Takeuchi, Michio Miyazaki, Tadao Bekku
  • Patent number: 5852539
    Abstract: An overheat protection circuit includes a resistor having a first lead connected to the engine temperature switch and the power take off (PTO) relay coil circuit. The second lead of the resistor is connected to the output of an interlock circuit to provide an energizing voltage signal to the PTO relay for operation of the PTO driven attachment when preselected operating conditions are present on the vehicle. If for any reason the engine temperature rises above a preselected maximum operating temperature, the engine temperature switch will close and cause the voltage at the second lead to drop below the minimum operating voltage of the PTO relay. The PTO relay deenergizes to remove drive from the attachment. The PTO cannot be reengaged until the engine operating temperature drops below the maximum operating temperature. The resistor preferably is a positive temperature coefficient thermistor to reduce power dissipation through the circuit while the temperature switch is closed and the PTO relay is deenergized.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: December 22, 1998
    Assignee: Deere & Company
    Inventor: Rudolph Andrew Peterson, Jr.
  • Patent number: 5793171
    Abstract: When a switch 12 is turned on, a relay coil 14b is excited by a current generated at the very moment when electric power of a dc power source 11 is supplied to a condenser 16 for actuation. Accordingly, a relay contact 14a is closed, and the power is given to a dc motor 15 via the switch 12 and the relay contact 14a. As a result, the dc motor 15 is actuated. At the same time, a part of a current running through the dc motor 15 is supplied to the relay coil 14b and brings about self-hold by which the dc motor 15 remains running. After that, when the driving of a device to be driven is forcibly regulated, an excess current passing through the dc motor 15 flows to a PTC thermistor (positive temperature coefficient thermistor) 13 which is connected in series to the dc motor 15. Owing to the excess current, the temperature of the PTC thermistor 13 is raised, and thereby the resistance of the PTC thermistor 13 is heightened. As a result, the relay contact 14a is opened to stop the dc motor 15.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: August 11, 1998
    Assignee: Ichikoh Industries, Ltd.
    Inventors: Kazuyasu Hayashi, Hisaki Hashimoto
  • Patent number: 5790355
    Abstract: An electric appliance control system is provided for use with an electric power unit such as an electric lawn mower. The electric appliance control system includes a battery, a selectively operable switch, a relay having first and second contacts, a control means, a charger circuit and an operator presence switch. The relay is operable by the switch to connect the electric power unit to the battery. The first and second contacts of the relay pass amperage therethrough between the battery and the electric power unit. The first contact is normally open and the second contact is normally closed. The control means includes a negative temperature coefficient thermistor in series with the first contact and multiple thermistors arranged in parallel and utilized in series with the second contact. The negative temperature coefficient thermistor variably increases the amperage passing through the first contact of the relay upon the selective operation of the switch to connect the electric power unit to the battery.
    Type: Grant
    Filed: January 22, 1996
    Date of Patent: August 4, 1998
    Assignee: MTD Products Inc.
    Inventor: William Ishmael
  • Patent number: 5784232
    Abstract: The present invention involves control and protection circuit for a compressor motor which includes an inductively activated contactor for controlling the flow of current to the compressor motor. The circuitry of the present invention includes a plurality of current detectors associated with each phase winding of the compressor motor for sensing the current in each phase winding. The sensed currents are combined in a predetermined manner and used to provide protection against an overcurrent condition, single phase operation and light loading condition. Additional detector circuits are also connected to the present control and protection circuit to provide protection against high temperature in the compressor motor windings, high temperature in various component of the compressor motor, and undervoltage in the power supply.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: July 21, 1998
    Assignee: Tecumseh Products Company
    Inventor: James B. Farr
  • Patent number: 5729416
    Abstract: A combination motor starter and protector module is described. The base member, in one embodiment, forms a motor protector compartment and a motor starter compartment. The motor protector, in one form, is a bimetallic switch configured to be coupled between a power source and the motor windings. The switch includes a stationary contact and a movable contact. A bimetal element, responsive to current flow through the protector, controls movement of the movable contact. The starter, in one form, is a positive temperature coefficient resistor (PTCR) disk configured to be connected in series circuit with the motor start winding. The cover of the combination housing includes, in one form, an integral capacitor support arm and terminal openings for receiving blade terminals of a run capacitor. The terminal openings in the cover align with blade receiving receptacles coupled to the PTCR start circuit.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: March 17, 1998
    Assignee: General Electric Company
    Inventors: Kenneth Ray Renkes, Robert William Damerow
  • Patent number: 5645746
    Abstract: Use of PTC circuit protection devices in motor vehicle wiring systems. The devices can replace some or all of the fuses conventionally used. Preferred devices contain PTC conductive polymers. Because the PTC devices can be reset without physical access to them, the wiring system can be arranged more efficiently and more economically. For example, the size of at least some of the wires of the harness can in many cases be reduced.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: July 8, 1997
    Assignee: Raychem Corporation
    Inventor: Malcolm R. Walsh
  • Patent number: 5617281
    Abstract: A circuit controller for selectively connecting a power source to a load includes a switching mechanism, which selectively connects the power source to the load and switches a current which flows through the switching mechanism, and a substantially radiant energy dissipating positive temperature coefficient current limiter for limiting the current which flows through the switching mechanism. The switching mechanism includes a current sensor, which senses the current flowing through the switching mechanism and provides a sensed current value, and a switching controller for disconnecting the power source from the load whenever the sensed current value is above a predetermined current value. The switching mechanism may include a contactor having separable contacts which are responsive to the switching controller. The current limiter may have a first resistance which results from a first series current, and a higher second resistance which results from a second series current.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: April 1, 1997
    Assignee: Eaton Corporation
    Inventors: James A. Bauer, Nelson R. Palmer, Kathryn M. Palmer, Henry A. Wehrli, III
  • Patent number: 5612847
    Abstract: A vehicle door (22) has a window (24) capable of being opened and closed. A master power window switch assembly (26) is mountable in an arm rest (28) of the door (22) near a driver of the vehicle. A polyswitch resettable fuse (56) is connected to a printed circuit board (50) of a master power window switch assembly (26) through a jumper terminal (58). An electrically conductive trace (52) is electrically connected to the jumper terminal (58). The polyswitch resettable fuse (56) may be used to limit current in the conductive trace (52) on the circuit board (50). Locating the polyswitch resettable fuse (56) between the power source (40) and the circuit board (50) permits design of the conductive traces (52), (53) and the circuit board electrical components for normal operating currents instead of significantly larger foreseeable motor stall current levels.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: March 18, 1997
    Assignee: TRW Inc.
    Inventors: Joseph F. Malecke, Dennis D. Kaufman, Derrick Titus
  • Patent number: 5598068
    Abstract: A plurality of LEDs are divided into multiple groups with the LEDs in each group being connected in series and being driven by a single current source. A region to be illuminated is divided into many areas with no spacing between adjacent ones of the areas. The LEDs in each group are positioned in different areas such that each area includes many LEDs from different groups. If one of the current sources and/or one of the LEDs of one group breaks down, the broken current source and/or LED does not affect the current sources and/or LEDs of the other groups.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: January 28, 1997
    Assignee: Sony/Tektronix Corporation
    Inventor: Kiyokazu Shirai
  • Patent number: 5550527
    Abstract: A resistor device for controlling a rotational speed of a resistance unit and an open-circuit means. A receiving recess is provided to any one side surface of a heat sink vertically affixed to a top surface plate of a housing. A resistance unit, which is protected by a film and made of metal material forming a resistor circuit for gradually controlling the rotational speed of a motor, is received within the recess in the heat sink and connected to a terminal. An open-circuit means, having a soldered portion which is fused at a predetermined temperature upon an overload of the motor, is provided at a predetermined distance between the resistance unit and a terminal.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: August 27, 1996
    Assignee: Dong A Electric Parts Co., Ltd.
    Inventor: Woo Y. Lee
  • Patent number: 5530613
    Abstract: A circuit controller for selectively connecting a power source to a load includes a non-overcurrent protective electrical switching mechanism and a conductive polymer current limiter connected in series with the load for limiting the current which flows through the switching mechanism whenever the power source is selectively connected to the load. The conductive polymer current limiter may include a plurality of parallel conductive polymer positive temperature coefficient (PTC) resistors. The circuit controller may include an electrical switching mechanism which, under short circuit conditions, remains selectively connected to the load. The short circuit current which is limited by the conductive polymer current limiter continues to flow through the electrical switching mechanism. The switching mechanism may include a contactor having separable contacts, and may further include a circuit interrupter, in order to provide a separate circuit disconnection mechanism.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: June 25, 1996
    Assignee: Eaton Corporation
    Inventors: James A. Bauer, Denis A. Mueller, Henry A. Wehrli, III, James D. B. Smith
  • Patent number: 5473495
    Abstract: A combination load controller for controlling application of power to a load such as a motor, has an input terminal coupleable to a power source, and an output terminal coupleable to a load. A conductive polymer and a protective, electromagnetic switch are disposed along a current path between the input and output terminals. The conductive polymer has a relatively low electrical resistance during conduction at nominal currents. The resistance of the conductive polymer increases substantially promptly upon conduction of excessive current, e.g., due to a short-circuit. In this manner the load is protected from even short bursts of excessively high, short-circuit current by the insertion of additional series resistance by the conductive polymer. The electromagnetic switch protects the line and load by opening the current path. The switch includes a current or voltage sensor coupled to a logic controller that opens the switch if over-current or under-voltage conditions persist for a predetermined period.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: December 5, 1995
    Assignee: Eaton Corporation
    Inventor: James A. Bauer
  • Patent number: 5436784
    Abstract: The motor relay includes thermal models representing the start and run conditions of a motor. The thermal models are implemented using measured current values and certain known operating parameters available from the manufacturer, specifically full load current, locked rotor thermal time and rated service factor. The thermal model information is compared with threshold thermal model values to determine when an overload condition has been reached.
    Type: Grant
    Filed: August 11, 1993
    Date of Patent: July 25, 1995
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Stanley E. Zocholl
  • Patent number: 5428493
    Abstract: In a relay device, a first PTC thermistor has one end connected to a first external connecting terminal, and the other end connected to one end of a second PTC thermistor, the other end of which is connected to a second external connecting terminal, and the thermo-switch is thermally coupled to the first and second PTC thermistors, and connected in parallel with the second PTC thermistor. The thermo-switch is held closed when not heated, and is opened by heat generated by the first or second PTC thermistor. Therefore, the relay device is low in initial resistance, and small in power consumption during heat balance.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: June 27, 1995
    Assignee: TDK Corporation
    Inventors: Michikazu Takeuchi, Hiroshi Nohara
  • Patent number: 5323287
    Abstract: A protective device for electric motors for protecting electric motors from high operational temperatures, has an element for determining an operational temperature of an electric motor and an element for automatically switching off of the electric motor when a predetermined limiting operational temperature is exceeded. The determining element is formed as electronic element for determining the operational temperature indirectly from an at least another operational parameter of the electric motor. The element for automatically switching off is formed as electronic element for automatically switching off of the electric motor.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: June 21, 1994
    Assignee: Robert Bosch GmbH
    Inventor: Cornelius Peter
  • Patent number: 5291085
    Abstract: A split-phase starter for an electric motor having a casing made up of a casing body and a lid secured to the casing body, the casing body having a first casing and a second casing, a relay contact mechanism being arranged in the casing body, and a positive temperature coefficient thermistor being arranged in the second casing.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: March 1, 1994
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Uehito Kawashima, Masahide Kobayashi, Hiroshi Kaise, Yutaka Hirano
  • Patent number: 5264766
    Abstract: In a vehicle window wiper system having an electric drive motor with high, low and common brushes, electric motor energizing apparatus and forward and reverse motor operation, an auto-resetting current limiting device provides non-sacrificial protection to motor windings and associated circuitry during the various modes of motor operation.
    Type: Grant
    Filed: September 10, 1992
    Date of Patent: November 23, 1993
    Assignee: General Motors Corporation
    Inventors: Steven L. Tracht, Eugene B. Porter, Christopher H. Jones, Richard L. Ponziani