Voltage Patents (Class 361/33)
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Patent number: 12072392Abstract: Provided is a short-circuit detection device including: a signal acquisition unit configured to acquire, from a magnetic flux detector configured to detect a magnetic flux generated in an air gap between a rotor and a stator of a rotating electric machine, a detection signal corresponding to the magnetic flux; a signal processing unit configured to subject the detection signal acquired by the signal acquisition unit to filtering of removing at least one component of odd-order components included in the detection signal, to thereby generate a filtered signal being the detection signal subjected to the filtering; and a short-circuit detection unit configured to detect a short circuit of a field winding through use of the filtered signal generated by the signal processing unit.Type: GrantFiled: April 12, 2019Date of Patent: August 27, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuji Takizawa, Haruyuki Kometani, Kenta Motoyoshi, Atsushi Yamamoto, Susumu Maeda, Nobuaki Muroki
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Patent number: 12000873Abstract: The disclosure provides a power tool, a detection circuit and a detection method of a load state thereof. The detection circuit of the power tool includes: a main control unit, a sampling resistor, a voltage sampling unit and an alarm display unit. The sampling resistor is arranged on a driving loop of a motor. The voltage sampling unit is used to sample a voltage across the sampling resistor. The alarm display unit is connected with the main control unit. The main control unit is configured to control the alarm display unit to execute a preset display state according to a voltage signal across the sampling resistor sampled by the voltage sampling unit.Type: GrantFiled: March 3, 2022Date of Patent: June 4, 2024Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Zefeng Wei, Biao Li, Xian Zhuang
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Patent number: 11996723Abstract: The present disclosure provides a switch driving circuit, the switch driving circuit includes a discharge circuit, a switch driving port, a voltage generating circuit, and a port conduction circuit. The discharge circuit supplies a voltage to the voltage generating circuit. The voltage generating circuit boosts the voltage to a driving voltage according to signal outputted by a microcontroller. The driving voltage controls an electronic switch module connected to the switch driving port to turn on or turn off. The port conduction circuit controls the switch driving port to make a connection between the voltage generating circuit and the electronic switch module according to a first control signal of the microcontroller. The present disclosure also provides a battery controlling circuit.Type: GrantFiled: March 5, 2020Date of Patent: May 28, 2024Assignee: DONGGUAN NVT TECHNOLOGY LIMITEDInventor: Jun Zhou
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Patent number: 11806296Abstract: A patient transport apparatus for transporting a patient over a floor surface is described herein. The patient transport apparatus includes an auxiliary wheel assembly including an auxiliary wheel, an auxiliary wheel drive system, and a control system for operating the auxiliary wheel drive system based on user commands. The control system includes a processor that is programmed to receive a user command to operate the auxiliary wheel drive system in a drive mode and responsively operate a motor control circuit to transmit power signals to a motor to rotate the auxiliary wheel. The processor is also programmed to receive a user command to operate the auxiliary wheel drive system in a free wheel mode and responsively operate the motor control circuit to enable the auxiliary wheel to rotate relatively freely with the auxiliary wheel in a deployed position.Type: GrantFiled: December 23, 2020Date of Patent: November 7, 2023Assignee: Stryker CorporationInventors: Richard A. Derenne, Gary L. Bartley, Scott A. Kuebler, Tyler Ethen, Matthew Aaron Whitehead, Anish Paul
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Patent number: 11711040Abstract: An inverter for driving a motor that has a switchable connection of windings and drives a load element having a periodically varying load torque is provided. The inverter is controlled so that an output torque of the motor follows the periodic variation of the load torque. The inverter is controlled so that a current flowing through the motor is zero during a period including a minimum torque phase at which the load torque is at or near a minimum value. The connection is switched while the current flowing through the motor is zero. It is possible to switch the connection of the windings while the motor is rotating, and avoid an increase in apparatus size.Type: GrantFiled: February 21, 2019Date of Patent: July 25, 2023Assignee: Mitsubishi Electric CorporationInventors: Shinya Toyodome, Kazunori Hatakeyama, Kenji Takahashi
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Patent number: 11697452Abstract: A method includes determining whether a multiphase electric machine is unstable. The method also includes, in response to a determination that the multiphase electric machine is unstable, setting a gate voltage of a first three terminal semiconductor switch to zero. The method also includes, in response to a determination that the multiphase electric machine is stable, setting the gate voltage of the first three terminal semiconductor switch to nonzero. The method also includes, in response to the first three terminal semiconductor switch being set to zero, increasing electrical conduction from one phase of the multiphase electric machine to another phase of the multiphase electric machine. The method includes, in response to the first three terminal semiconductor switch being set to nonzero, increasing electrical resistance from the one phase of the multiphase electric machine to the another phase of the multiphase electric machine.Type: GrantFiled: February 7, 2020Date of Patent: July 11, 2023Assignee: Steering Solutions IP Holding CorporationInventors: Paul M. Fisher, David P. Holm
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Patent number: 11680473Abstract: A hydraulic fracturing system includes a pump, an electrically powered motor for driving the pump, a trailer on which the pump and motor are mounted, and a transformer that steps down electricity for use by the motor. Electrical output from the transformer connects to a series of receptacles mounted onto a housing around the transformer. A similar set of receptacles is provided on the trailer and which are electrically connected to the motor. Power cables equipped with plugs on their opposing ends insert into the receptacles to close an electrical circuit between the transformer and pump.Type: GrantFiled: March 16, 2021Date of Patent: June 20, 2023Assignee: U.S. Well Services, LLCInventor: Jared Oehring
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Patent number: 11585142Abstract: An open roof assembly for use in a vehicle roof of a vehicle comprises a moveably arranged closure member for selectively covering or at least partially exposing an opening in the vehicle roof, an electric motor operatively coupled to the closure member through a mechanical drive assembly for moving the closure member, an electric driving unit for providing a supply signal to the electric motor and a control unit operatively coupled to the electric driving unit for controlling operation of the electric motor. The electric driving unit comprises four switching devices in a bridged configuration and the control unit is configured to control a motion of the closure member by controlling operation of the switching devices, and to incur a safety stop during a motion of the closure member by an immediate reversal of a polarity of the supply signal.Type: GrantFiled: December 8, 2020Date of Patent: February 21, 2023Assignee: INALFA ROOF SYSTEMS GROUP B.V.Inventors: Dennie Wilhelmus Hendrikus Craane, Gerrit Schwepper
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Patent number: 11498614Abstract: A control device for an on-board device including an actuator is configured to: supply power to a first microprocessor and a first driver circuit from a first power source through a first power supply path; supply power to a second microprocessor and a second driver circuit from a second power source through a second power supply path; and use the first and second driver circuits to drive the actuator. In this control device, the negative electrodes of the first and second power sources are electrically connected to a common ground portion. Furthermore, the control device includes a first and second sensor for measuring current or voltage between the vehicle body ground and the negative electrodes of the first and second power source, respectively. When detecting an abnormal current or voltage, the first and second microprocessors control the first and second driver circuits so as to place a limit on power supply to the actuator.Type: GrantFiled: January 23, 2019Date of Patent: November 15, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Mitsuaki Nakada, Mitsuo Sasaki
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Patent number: 11485394Abstract: A locomotive control system includes a locomotive having a traction motor and sensors. The traction motor provides tractive effort for propelling the locomotive and the sensors measure performance conditions of the locomotive. The system also includes a controller having one or more processors communicatively coupled with the traction motor. The controller selects one or more baseline conditions that designate operational conditions under which the locomotive is to operate, and monitors the performance conditions that are generated by the locomotive during operation of the locomotive according to the operational conditions designated by the one or more baseline conditions. The controller identifies a flashover condition or a plugging condition of the locomotive by comparing the performance conditions that are generated by the locomotive during operation of the locomotive with the one or more baseline conditions.Type: GrantFiled: November 26, 2018Date of Patent: November 1, 2022Assignee: TRANSPORTATION IP HOLDINGS, LLCInventors: Premsunder Ravi, Chandra Mouleswar Reddy S., Munishwar Ahuja, Shankar Chandrasekaran, Bret Worden
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Patent number: 11043913Abstract: A controller apparatus for an electric power tool is provided where the electric power tool includes a battery and a DC brushless motor. The controller apparatus includes a current detector that detects an instantaneous current flowing in the DC brushless motor; a current calculator that calculates one of an average value and an effective value of the instantaneous current detected by the current detector; a current controller configured to utilize a result from the current calculator as a detected value; and a speed controller configured to generate a target value of the current controller. The controller apparatus further includes a limiter that limits the target value of the current controller, where the limiter is provided at an output stage of the speed controller.Type: GrantFiled: April 17, 2018Date of Patent: June 22, 2021Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventor: Fumiiki Yoneda
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Patent number: 10840848Abstract: To provide a motor driver and a motor driving system which allow a reduction in power consumption of a heat exchanger provided in a power magnetics cabinet while keeping down manufacturing cost. A motor driver is accommodated in a power magnetics cabinet and drives a motor. The motor driver comprises: a storage unit that stores the quantity of heat generated independently of the value of a current I[Arms] caused to flow in the motor as a generated heat quantity a[W]; a current detection unit that detects the value of the current I[Arms] caused to flow in the motor; and a heat quantity calculation unit that calculates the quantity of heat P[W] released to the interior of the power magnetics cabinet by adding the heat quantity a[W] stored in the storage unit and a heat quantity q×K[W/Arms]×I[Arms] responsive to the value I[Arms] detected by the current detection unit.Type: GrantFiled: December 7, 2018Date of Patent: November 17, 2020Assignee: FANUC CORPORATIONInventors: Kai Fukuda, Ryou Matsuda
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Patent number: 10514427Abstract: A method for detecting a reverse current in a switching structure supplying power to an inductive load, having at least one switch and linked to an electric power source and to a ground for a control phase in which the current from the source supplies power to the load in accordance with a given duty cycle and a freewheeling phase in which the induced current from the load is decreasing, the reverse current being liable to be created during a freewheeling phase following a high duty cycle in a previous control phase creating a counter-electromotive force (cemf). The cemf is approximated proportionally to the integration of the duty cycle (integ[Dut cycl]) as a function of time (t), the reverse current either being calculated as a function of the estimated cemf or a reversal of the current criterion being established.Type: GrantFiled: December 18, 2017Date of Patent: December 24, 2019Assignees: Continental Automotive France, Continental Automotive GmbHInventor: Angelo Pasqualetto
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Patent number: 10469020Abstract: A power conversion apparatus includes a power conversion circuit and a control unit. The power conversion circuit converts electric power supplied from a power supply and outputs the converted electric power. The control unit controls the power conversion circuit. The power conversion circuit has at least one phase that is configured as a parallel-connection phase in which two semiconductor elements are connected in parallel to each other in each of an upper arm connected to a high potential-side wiring of the power supply and a lower arm connected to a low potential-side wiring of the power supply. The control unit detects temperature information related to element temperatures of all of the plurality of semiconductor elements of a target arm that is either of the upper arm and the lower arm of the parallel-connection phase, and performs overheating protection control of the power conversion circuit based on the detected temperature information.Type: GrantFiled: April 24, 2017Date of Patent: November 5, 2019Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tomohisa Sano, Yuu Yamahira, Yoshihito Mizuno
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Patent number: 10230304Abstract: System and method for regulating a power conversion system. An example system controller for regulating a power conversion system includes a signal generator and a driving component. The signal generator is configured to receive a feedback signal associated with an output signal of a power conversion system and a current sensing signal associated with a primary current flowing through a primary winding of the power conversion system and generate a modulation signal based on at least information associated with the feedback signal and the current sensing signal. The driving component is configured to receive the modulation signal and output a drive signal to a switch based on at least information associated with the modulation signal.Type: GrantFiled: June 15, 2017Date of Patent: March 12, 2019Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Dongze Yang, Miao Li, Lieyi Fang
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Patent number: 10036238Abstract: A hydraulic fracturing system includes a pump, an electrically powered motor for driving the pump, a trailer on which the pump and motor are mounted, and a transformer that steps down electricity for use by the motor. Electrical output from the transformer connects to a series of receptacles mounted onto a housing around the transformer. A similar set of receptacles is provided on the trailer and which are electrically connected to the motor. Power cables equipped with plugs on their opposing ends insert into the receptacles to close an electrical circuit between the transformer and pump.Type: GrantFiled: May 3, 2016Date of Patent: July 31, 2018Assignee: U.S. WELL SERVICES, LLCInventor: Jared Oehring
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Patent number: 9427294Abstract: An electrical appliance with a resonant motor for driving a vibratory component is provided that has a control unit for driving the resonant motor with a predetermined driving frequency and for measuring the motion-induced voltage of the resonant motor and for determining whether the measured voltage value coincides with a predetermined target voltage value or whether the measured voltage value has crossed over the predetermined target value. The control unit measures the motion-induced voltage at a predetermined time of measurement (tm) within a driving cycle.Type: GrantFiled: August 19, 2011Date of Patent: August 30, 2016Assignee: BRAUN GMBHInventors: Torsten Klemm, Ingo Vetter, Uwe Jungnickel
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Patent number: 9166476Abstract: A power supply circuit that includes a voltage conversion circuit (CONV) for outputting an output voltage to an output voltage terminal, the output voltage being stepped up or stepped down from an input voltage (VIN) presented to an input voltage terminal, an output capacitor (COUT) coupled to the output voltage terminal, and a charge extraction circuit for extracting the charge of the output capacitor (COUT). Quick response to overshoot of VOUT generated by a sudden reduction in load current (ILOAD) is afforded, and overshoot is minimized.Type: GrantFiled: December 21, 2011Date of Patent: October 20, 2015Assignee: Asahi Kasei Microdevices CorporationInventor: Katsutomi Harada
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Patent number: 9071188Abstract: A protective redundancy circuit is provided for a power tool having an electric motor. The protective redundant subsystem is comprised of: a motor switch coupled in series with the motor; a motor control module that controls the switching operation of the motor switch; and a protective control module that monitors switching operation of the motor switch and disables the power tool when the switching operation of the motor switch fails. In the context of an AC powered tool, the switching operation of the motor switch is correlated to and synchronized to the waveform of the AC input signal. During each cycle or half cycle, the motor control module introduces a delay period before closing the motor switch and the protective control module determines the operational status of the motor switch by measuring the voltage across the motor switch during the delay period.Type: GrantFiled: September 3, 2010Date of Patent: June 30, 2015Assignee: Black & Decker Inc.Inventors: John C. Vanko, Larry T. Albert, Michael K. Forster, Bhanuprasad V. Gorti, Jason K. Leh, Garrett P. McCormick, Samuel G. Woods, David R. Beers
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Patent number: 9059584Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.Type: GrantFiled: January 12, 2011Date of Patent: June 16, 2015Assignee: ROBERT BOSCH GMBHInventors: Stefan Spannhake, Jochen Fassnacht, Hans-Peter Mueller
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Publication number: 20150085403Abstract: An apparatus for controlling a high-power drive device external to a package of a motor drive circuit includes a motor drive circuit. The motor drive circuit includes a driver to control the high-power drive device based on a first reference voltage, a second reference voltage, and a control signal based on a received control signal. A fault circuit generates a failure indicator based on a voltage across terminals of the high-power drive device. A fault condition is based on the failure indicator. A first terminal coupled to the driver charges a node of the high-power drive device over a first length of time in response to an absence of the fault condition and a first level of the control signal. A second terminal coupled to the driver discharges the node over a second length of time different from the first length of time.Type: ApplicationFiled: September 25, 2013Publication date: March 26, 2015Inventors: Paulo Santos, Tufan Karalar, Michael J. Mills, Ross Sabolcik, Rudye McGlothlin, Michael L. Duffy, András Vince Horvath
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Patent number: 8964337Abstract: Systems and methods for monitoring excitation of a generator based on a faulty status of a generator breaker are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive, from a contact associated with a generator breaker, a reported status of the generator breaker, receive operational data associated with one or more parameters of a generator associated with the generator breaker, and correlate the reported status of the generator breaker and the operational data. Based on the correlation, the processor may establish an actual status of the generator breaker, and, based on the actual status, selectively modify a mode of excitation of the generator.Type: GrantFiled: December 28, 2012Date of Patent: February 24, 2015Assignee: General Electric CompanyInventors: Abhinandan Sharma, Shashidhar Nibhanupudi, Sridhar Nedunsezian
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Patent number: 8917486Abstract: A vibration generating apparatus with high yield, low cost, and can exhibit vibration tactile haptic effects even with variation in the natural frequency of a mechanical vibrator, including a damping system having a damping ratio ?<1 to support a mechanical vibrator to a fastening part, and a magnetizing unit generating a dynamic magnetic field to vibrate the mechanical vibrator by non-contact, the mechanical vibrator generating a beat vibration by making the frequency of a drive voltage applied to the magnetizing unit, from a drive start or middle of drive, to be a non-resonant frequency out of a damped natural frequency of the mechanical vibrator, wherein the apparatus comprises a forced vibration control unit controlling to stop application of the drive voltage, in a beat wave defining an amplitude of the beat vibration, at a second valley part after a first peak part from the side of the drive start.Type: GrantFiled: July 26, 2011Date of Patent: December 23, 2014Assignee: Nidec Seimitsu CorporationInventor: Miyazaki Masahiko
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Patent number: 8861145Abstract: A suppression circuit may be added to a motor driver circuit, which suppresses offset voltage and ringing in the output signal. The suppression circuit may include an RC circuit filter connected to a pin of a microchip providing a gating reference signal and a junction between high and low side MOSFETS connected to the microchip.Type: GrantFiled: July 19, 2012Date of Patent: October 14, 2014Assignee: Honeywell International Inc.Inventors: Joseph Marotta, Dale Trumbo, Nasrullah Habeeb M, Rajamohan Revindranathan
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Publication number: 20140268433Abstract: A compressor is provided and includes a single-phase electric motor and a protector device. The electric motor drives a compression mechanism and has a rotor and a stator. The stator is comprised of aluminum windings. The protector device is attached to the stator and is configured to disconnect the electric motor from a power supply when an input voltage of the power supply to the electric motor is less than a threshold voltage value set at a level between a minimum run voltage and an overheat voltage of the compressor. The overheat voltage corresponds to an overheat temperature of the electric motor. The threshold voltage value is set at a level that is between the minimum run voltage and the overheat voltage. The protector device includes a tolerance level such that the threshold voltage minus the tolerance level is greater than the overheat voltage and the threshold voltage plus the tolerance level is less than the minimum run voltage.Type: ApplicationFiled: February 28, 2014Publication date: September 18, 2014Applicant: Emerson Climate Technologies, Inc.Inventors: Jefferson B. Johnson, Jeffrey John Hoying, Anthony P. Motz
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Publication number: 20140247524Abstract: A method includes receiving N power signals, each having a different one of N phases, over N power supply lines, where N is an integer greater than two. The method further includes selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines. The method includes generating a signal based on the first current, and selectively generating a phase failure signal when the signal is less than a predetermined threshold.Type: ApplicationFiled: May 12, 2014Publication date: September 4, 2014Applicant: Emerson Climate Technologies, Inc.Inventors: Yunfeng WU, Yongbing WANG
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Publication number: 20140218828Abstract: A power-protection apparatus is provided.Type: ApplicationFiled: September 10, 2013Publication date: August 7, 2014Applicant: Delta Electronics, Inc.Inventors: Che-Hung LIN, Yueh-Lung HUANG, Yen-Hung CHEN
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Patent number: 8716967Abstract: A motor control device for controlling a three-phase brushless motor that has a rotor and field coils includes: a load range determining unit that determines a rotor rotation angle range, in which the three-phase brushless motor becomes a load, as a load range when a short-circuit fault occurs in one of a plurality of switching elements. The load range determining unit determines a rotor rotation angle range, in which load current is presumed to flow through a closed circuit formed of the short-circuit switching element and any one of regenerative diodes connected in parallel with the respective normal switching elements when the rotor is rotated in a state where all the switching elements other than the short-circuit switching element are turned off, as the load range.Type: GrantFiled: March 24, 2011Date of Patent: May 6, 2014Assignee: JTEKT CorporationInventor: Shigekazu Okumura
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Publication number: 20140118867Abstract: Protection of a motor controller from a transient voltage and/or an over-voltage condition is described. A drive circuit includes a rectifier portion and at least one inductive device coupled to the rectifier portion. The drive circuit further includes at least one voltage clamping device coupled in parallel with the at least one inductive device, and at least one switching device configured to open as a function of a direct current (DC) link voltage value.Type: ApplicationFiled: October 25, 2012Publication date: May 1, 2014Applicant: Regal Beloit America, Inc.Inventors: Roger Carlos Becerra, Yao Da, David Allen Clendenen
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Publication number: 20140111890Abstract: A bi-directional electrostatic discharge (ESD) protection device may include a substrate, an N+ doped buried layer, an N-type well region and two P-type well regions. The N+ doped buried layer may be disposed proximate to the substrate. The N-type well region may encompass the two P-type well regions such that a portion of the N-type well region is interposed between the two P-type well regions. The P-type well regions may be disposed proximate to the N+ doped buried layer and comprise one or more N+ doped plates and one or more P+ doped plates.Type: ApplicationFiled: October 19, 2012Publication date: April 24, 2014Applicant: MACRONIX INTERNATIONAL CO., LTD.Inventors: Hsin-Liang Chen, Shuo-Lun Tu
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Publication number: 20140022676Abstract: A suppression circuit may be added to a motor driver circuit, which suppresses offset voltage and ringing in the output signal. The suppression circuit may include an RC circuit filter connected to a pin of a microchip providing a gating reference signal and a junction between high and low side MOSFETS connected to the microchip.Type: ApplicationFiled: July 19, 2012Publication date: January 23, 2014Applicant: HONEYWELL INTERNATIONAL INC.Inventors: JOSEPH MAROTTA, DALE TRUMBO, NASRULLAH HABEEB M, RAJAMOHAN REVINDRANATHAN
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Publication number: 20130277138Abstract: A motor drive apparatus includes a back EMF detection element and a protection control circuit. When a voltage detected by the back EMF detection element exceeds a threshold voltage of a Zener diode, a voltage signal is applied to a sensing gate through a detection signal line to sequentially turn on switching element of the low-side arm. A current caused by the back EMF applied to a drive circuit flows to the ground through the switching element of the low-side arm in an on-state. Thus a braking torque is applied to a motor, which is driven to rotate by an external force, and hence the back EMF is reduced. Switching elements in the drive circuit are thus protected from the excessive voltage.Type: ApplicationFiled: April 10, 2013Publication date: October 24, 2013Applicant: Denso CorporationInventors: Kanta ARAI, Toshihisa YAMAMOTO
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Publication number: 20130271881Abstract: The invention relates to a protective circuit (10) in a screen wiper drive (1), consisting of a parallel circuit having two circuit elements (16, 17), wherein one circuit element (16) consists of a capacitor (18) and the other circuit element (17) consists of a series-connection of a diode (19) and a Zener diode (20), wherein the forward direction of the diode (19) and the Zener diode (20) is different and the Zener diode (20) inhibits in the direction of a plus pole.Type: ApplicationFiled: December 8, 2011Publication date: October 17, 2013Applicant: VALEO SYSTEMES D'ESSUYAGEInventors: Marco Rommel, Peter Kiersten, Armin Schubert
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Patent number: 8502485Abstract: A motor drive circuit includes a positive and a negative supply rail for connection to a battery (104), a motor drive circuit including a plurality of motor drive subcircuits which each selectively permit current to flow into or out of a respective phase of a multi-phase motor (101) in response to control signals from a motor control circuit, and a switching means including at least one switch which is in series with a respective phase of the motor which is normally closed to permit the flow of current to and from the subcircuit to the respective motor phase. A fault signal detecting means (160) detects at least one fault condition and, in the event of a fault condition being detected, causes the at least one switch to open. A snubber circuit (150) is associated with the motor and is arranged so that following the opening of the switch, energy stored in the motor windings is diverted away from the switching means through the snubber circuit to the battery.Type: GrantFiled: April 7, 2010Date of Patent: August 6, 2013Assignee: TRW Automotive US LLCInventors: Maciej Kudanowski, Andrew McLean
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Patent number: 8462470Abstract: An automatic power-off and actuation circuit for a fan comprises a drive unit, a detection unit, a voltage-modulating unit, a comparison unit, an auto-restart unit, a regulation unit and a controlled IC, wherein the detection unit is electrically connected to the drive unit, the voltage-modulating unit is electrically connected to the detection unit, the comparison unit is electrically connected to the voltage-modulating unit, the auto-restart unit is electrically connected to the comparison unit, the regulation unit is electrically connected to the auto-restart unit and the drive unit, and the controlled IC is electrically connected to the regulation unit and the drive unit.Type: GrantFiled: August 6, 2010Date of Patent: June 11, 2013Assignee: ADDA Corp.Inventors: Ching-Cheng Ma, Ting-Cheng Lan
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Publication number: 20130128394Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.Type: ApplicationFiled: January 12, 2011Publication date: May 23, 2013Inventors: Stefan Spannhake, Jochen Fassnacht, Hans-Peter Mueller
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Publication number: 20130107401Abstract: A method is provided for controlling operation of an air conditioning unit. The method comprises supplying line voltage to activate a motor configured to operate the air conditioning unit, and monitoring a supply of control voltage in order to control operation of the air conditioning unit, the supply of control voltage being derived from line voltage. In response to detecting a control voltage below a predetermined threshold and/or by a predetermined percentage, a time delay is initiated. The method further comprises deactivating the motor if a predetermined increase in control voltage is not detected before the time delay expires.Type: ApplicationFiled: October 31, 2011Publication date: May 2, 2013Applicant: TRANE INTERNATIONAL INC.Inventor: Robert W. Helt
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Publication number: 20130088799Abstract: The motor monitoring system of the present disclosure uses several calculated monitoring values to determine a status of a motor and take a predetermined action when a threshold corresponding with the monitoring value is exceeded. The threshold may be calculated by an intelligent electronic device (IED) monitoring the motor. The predetermined action may include further monitoring of the motor. The predetermined action may include monitoring equipment not directly monitored by the IED.Type: ApplicationFiled: October 4, 2012Publication date: April 11, 2013Applicant: SCHWEITZER ENGINEERING LABORATORIES, INC.Inventor: Schweitzer Engineering Laboratories, Inc.
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Patent number: 8412432Abstract: A protective circuit arranged on a Printed Circuit Board (PCB) has two conductor loops. At least one supply voltage track, at least one semiconductor switch and at least one control component are arranged on the PCB. A first terminal of the control component and a first terminal of the semiconductor switch are connected electrically. A first conductor loop of the protective circuit is arranged on the PCB so that it surrounds an electrically conducting connection between the supply voltage track and the semiconductor switch and/or the control component. A second conductor loop is arranged on the PCB so that it surrounds the electrically conducting connection between the first terminal of the control component and the first terminal of the semiconductor switch, and thereby screens the same from the semiconductor switch and at least from those regions of the control component that are also connected to the supply voltage track.Type: GrantFiled: April 15, 2009Date of Patent: April 2, 2013Assignee: Lucas Automotive GmbHInventors: Matthias Fuchs, Marco Junglas, Lutz Muders, Benedikt Ohlig
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Patent number: 8354813Abstract: A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section.Type: GrantFiled: December 10, 2008Date of Patent: January 15, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Ryuta Hasegawa, Ryuichi Morikawa, Toshiharu Oobu
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Patent number: 8334670Abstract: An electric motor control circuit includes an electric energy storage device electrically connected via DC power buses to an inverter circuit that connects via an alternating current circuit to an electric machine. A capacitive shunt circuit connects between the power buses. Current flow through the capacitive shunt circuit to the chassis ground is monitored. A fault is identified when the current flow through the capacitive shunt circuit to the chassis ground exceeds a threshold.Type: GrantFiled: March 25, 2010Date of Patent: December 18, 2012Assignee: GM Global Technology Operations LLCInventor: John William Meyer, III
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Patent number: 8264280Abstract: Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1 and Q4, turns on an NMOS transistor Q3, and turns on and off an NMOS transistor Q2 intermittently so as to control rotation of a motor 10. A detection circuit 30a detects a voltage Va at a connection node a between the NMOS transistor Q2 and the motor 10 a predetermined time after the NMOS transistor Q2 is turned on. A control circuit 20 turns off the NMOS transistor Q2 so as to cut off a current from a power supply to the motor 10 if the voltage Va at the connection node a is within a range in which the motor 10 is determined to be short-circuited.Type: GrantFiled: July 7, 2009Date of Patent: September 11, 2012Assignee: Renesas Electronics CorporationInventor: Koichiro Oku
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Patent number: 8169174Abstract: In a steering control unit, a U-phase feed line branches into paired branch feed lines, phase-open MOSFETs are provided in middle portions of the branch feed lines, phase-open MOSFETs are provided in middle portions of a V-phase feed line and a W-phase feed line, and the phase-open MOSFETs are arranged in such a manner that parasitic diodes are in the same orientation with respect to a motor. When an abnormality occurs, all the phase-open MOSFETs are turned off. Then, a closed circuit, which includes phase coils and through which electric currents flow, is no longer present.Type: GrantFiled: September 21, 2009Date of Patent: May 1, 2012Assignee: JTEKT CorporationInventor: Yoshiyuki Shibata
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Patent number: 8169177Abstract: An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges whether an overcurrent is generated in an inverter for generation or an inverter for travel. When an overcurrent is generated in one of the inverters, the inverter selection unit selects the other inverter to be driven. The inverter drive control unit stops the driving of the one inverter and drives the other inverter to drive a travel motor or a generator.Type: GrantFiled: March 7, 2008Date of Patent: May 1, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventor: Takeshi Kishimoto
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Patent number: 8159111Abstract: A driving device includes a motor, a clutch gear, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The clutch gear is fixed to the rotating shaft. The first rotating portion sleeved on the rotating shaft includes a first end meshing with the clutch gear and a second end opposite to the first end. The second rotating portion is engaged with the second end. The piezoelectric assembly is sandwiched between the second end and the second rotating portion. The controlling unit is electrically connected to the motor and the piezoelectric assembly. The controlling unit is configured for storing a predetermined voltage, and determining whether a voltage output by the piezoelectric assembly equals to or exceeds the predetermined voltage. A protection method for the driving device is also provided.Type: GrantFiled: May 19, 2009Date of Patent: April 17, 2012Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.Inventor: Song-Ling Yang
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Patent number: 8154240Abstract: A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter reactor provided between the filter capacitor and an overhead line, an overhead line voltage measuring instrument that measures a voltage value of the overhead line, a voltage increase detection unit that senses an amount of voltage increase occurring when, with an overhead line voltage being supplied, the overhead line voltage goes beyond a reference voltage value and rises at a rate equal to or higher than that by a predetermined time constant.Type: GrantFiled: December 5, 2006Date of Patent: April 10, 2012Assignee: Mitsubishi Electric CorporationInventors: Hideto Negoro, Masaki Kono
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Patent number: 8144439Abstract: A method and a circuit are provided for the commutation of brushless direct-current motors (BLDC motors), without using sensors, and especially to a method and a circuit for producing rotor position signals, without using sensors, for the commutation of brushless direct-current motors. In the method and the circuit Hall sensor signals are emulated without sensors and rotor position signals free of disturbing pulses and with a correct phase position are generated from said signals. The rotor position signals can be used to carry out a reliable, sensor-free commutation.Type: GrantFiled: November 30, 2008Date of Patent: March 27, 2012Assignee: Trinamic Motion Control GmbH & Co. KGInventors: Lars Larsson, Bernhard Dwersteg
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Patent number: 8144438Abstract: A motor control center communication system configured to interface with a communication network. The system includes a plurality of motor control units (MCUs), and a MCU controller configured to transmit and receive data signals via the communication network to and from, the plurality of MCUs. Each of the plurality of MCUs includes a magnetic contactor having electrical contacts operable between open and closed positions, and a local control module operatively connected to the associated magnetic contactor and to the MCU controller, and configured to monitor a status of the electrical contacts, transmit the monitored status information to the MCU controller, and actuate the associated magnetic contactor based on data signals received from the MCU controller.Type: GrantFiled: October 3, 2008Date of Patent: March 27, 2012Assignee: General Electric CompanyInventors: Cecil Rivers, Jr., Thomas Frederick Papallo, Jr.
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Patent number: 8130478Abstract: A power limiting system for multiple electric motors includes an electrical power generating component, such as an alternator, and a plurality of motor controllers connected to an electrical bus. Each motor controller compares the voltage on the bus to a specified minimum voltage and a specified maximum voltage, and reduces its electric power output if the voltage on the bus is less than the maximum voltage while continuing to operate the electric motors.Type: GrantFiled: April 7, 2009Date of Patent: March 6, 2012Assignee: Deere & CompanyInventors: Clement Vanden Godbold, Patrick Wilson Cross
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Patent number: 8125179Abstract: A motor control circuit (MC) comprising input terminals (IT1, IT2) to receive a rectified input voltage (Vrm), and output terminals (OT1, OT2) to supply a motor drive signal (Vm). A switching circuit (1) is alternately in an on-state (Ton) and an off-state (Toff) for intermittently coupling the input terminals (IT1, IT2) to the output terminals (OT1, OT2). A controller (2) controls the switching circuit (1) to be (i) in the on-state (Ton) during a first period in time (T1) when an amount of magnetic saturation of the motor is smaller than a predetermined value, and (ii) alternately in the on-state (Ton) and the off-state (Toff) to obtain a pulse width control of the motor drive signal (Vm) during a second period in time (T2) when the amount of magnetic saturation of the motor is larger than the predetermined value.Type: GrantFiled: March 6, 2008Date of Patent: February 28, 2012Assignee: Koninklijke Philips Electronics N.V.Inventors: Wessel Adolf Otten, Wilhelmus Ettes