Comparator Circuit Or Method Patents (Class 318/400.06)
  • Patent number: 11336218
    Abstract: A motor controller comprises a switch circuit, a driving circuit, and a pulse width modulation circuit. The switch circuit is coupled to a three-phase motor for driving the three-phase motor. The driving circuit generates a plurality of control signals to control the switch circuit. When the three-phase motor is operated in a start state, the motor controller may enable an electric period to be divided into more floating phase time intervals for switching phases, so as to increase the success rate of phase switching. When the three-phase motor is operated in a stable state, the motor controller may enable the electric period to be divided into less floating phase time intervals for switching phases, so as to reduce the noise and vibration of the three-phase motor.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: May 17, 2022
    Assignee: Global Mixed-mode Technology Inc.
    Inventor: Guang-Nan Tzeng
  • Patent number: 11262405
    Abstract: The present disclosure describes an apparatus, system, and method of use for detecting electrical faults in a multiphase electric machine. Often in platforms which require redundant reliability or have no readily available electrical connection to earth use ungrounded electrical architectures. This allows the system to continue normal operation even if there is an unintended short circuit or current path (electrical fault) between a phase of an electric machine and its case or some other part of the platform. It is important to be able to readily identify any fault in the phase windings of machinery operating in an ungrounded electrical architecture. Since a single fault in an ungrounded system will not cause any additional current draw or otherwise affect the system, it can be difficult to detect that a fault has even occurred. This provides an advanced warning system.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: March 1, 2022
    Assignee: Calnetix Technologies, LLC
    Inventors: Suratkal P. Shenoy, Liping Zheng
  • Patent number: 11095233
    Abstract: An electric power conversion apparatus includes a first inverter electrically connected to one end of each of phase windings of a motor, and a second inverter electrically connected to the other end of each of the phase windings, and a neutral point potential setting circuit electrically connected to the first inverter to set a potential of a neutral point in the first inverter when the first inverter is determined to be in an abnormal state.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: August 17, 2021
    Assignee: NIDEC CORPORATION
    Inventor: Kaori Nabeshi
  • Patent number: 10978974
    Abstract: A motor starting device includes a starting unit, a driving unit, a floating point selecting unit, a back electromotive force (BEMF) detecting unit and a control unit. In a starting mode, the starting unit generates an initial starting signal having a plurality of phases according to a commutation sequence, the driving unit drives the motor with a first phase in the initial starting signal, the floating point selecting unit selects a floating phase of the motor that is not turned on according to the driving condition of the driving unit, the BEMF detecting unit detects whether the BEMF of the floating phase has a first voltage level or a second voltage level to generate a detection result, and the control unit outputs a phase changing signal to the driving unit according to the detection result.
    Type: Grant
    Filed: November 19, 2019
    Date of Patent: April 13, 2021
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventor: Kun-Min Chen
  • Patent number: 10951142
    Abstract: A control system and a control method, used for controlling a motor. The control system includes a central processing module and a drive control module. In a period in which a voltage is not applied to any phase coil of the motor, the drive control module collects voltages of the phase coil, converts the voltages of the coil into digital signals and stores the digital signals. The central processing module reads the digital signals from the drive control module, accumulates the digital signals to obtain an accumulated value, and determines the operating condition of the motor according to a relationship between the accumulated value and a preset threshold, thereby improving the reliability of the motor control.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: March 16, 2021
    Assignee: Hangzhou Sanhua Research Institute Co., Ltd.
    Inventors: Xiaojun Jiang, Likun Yang, Edwin J. Stanke, Jinlan Xie
  • Patent number: 10910967
    Abstract: A motor driver device supplies drive voltages to three phase coils of a stator in a brushless DC motor based on a detection result of a position of a rotor in a sensorless manner. In a position detection section, two phase coils are set as a target coil pair and a remaining one phase coil is set as a non-target coil, and with respect to all combinations of target coil pairs, a first process of applying a pulse voltage from a first direction to the target coil pair and a second process of applying a pulse voltage from a second direction opposite to the first direction to the target coil pair are executed. In the first and second processes, power supply to the non-target coil is stopped. The position of the rotor is detected based on voltages generated in the non-target coil in each first process and each second process.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: February 2, 2021
    Assignee: Rohm Co., Ltd.
    Inventor: Shinichi Miura
  • Patent number: 10693454
    Abstract: In some examples, a device includes a gate driver circuit and a control circuit configured to generate a first signal and a second signal, a duty cycle of the first signal encoding an amplitude of an electrical current having a sinusoidal shape, and a duty cycle of the second signal encoding a phase angle of the electrical current. The control circuit is configured to deliver the first and second signals to the gate driver circuit, which is configured to determine a duty cycle of a driver signal as a function of the first signal and of the second signal. The gate driver circuit is also configured to deliver the driver signal to a switch to cause the electrical current having the sinusoidal shape to be delivered to an electrical load.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: June 23, 2020
    Assignee: Infineon Technologies Austria AG
    Inventors: Giuseppe Bernacchia, David Grant Cox
  • Patent number: 10658947
    Abstract: The junction temperature of a field effect transistor is detected with a higher degree of accuracy than in the past. A semiconductor device controls multiple field effect transistors that configure a power conversion device, and includes a differential amplifier and a controller that controls ON/OFF of the multiple field effect transistors. The differential amplifier detects the potential difference between a source and a drain of a field effect transistor that is controlled in the OFF state by the controller and that induces an electric current flowing through the body diode thereof, among the multiple field effect transistors.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: May 19, 2020
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventor: Satoshi Narumi
  • Patent number: 10644636
    Abstract: An electric motor that is controlled by a motor control device has two-system multi-phase motor coils. The motor control device includes a common mode noise reduction unit that changes a PWM count in a PWM cycle for at least one phase in one of two systems such that a current that flows through a stray capacitance because of an output voltage for one phase in the other system is canceled out with a current that flows through the stray capacitance because of an output voltage for the at least one phase in the one system in at least one PWM cycle in a current control cycle.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: May 5, 2020
    Assignee: JTEKT CORPORATION
    Inventor: Hiroshi Sumasu
  • Patent number: 10630212
    Abstract: The present invention relates to an inverter-controlling device. The inverter-controlling device include a main controller configured to generate a predetermined command current; a comparison module configured to calculate a difference between the command current and an output current of an inverting module; a current controller configured to perform a proportional-integral (PI) control based on the difference; and a frequency estimation module configured to estimate a rotation speed of a motor based on a current response to the command current while the command current is injected to the current controller, wherein the main controller is further configured: when a flying start operation of the inverting module begins, to set an output frequency of the inverting module based on the rotation speed of the motor estimated by the frequency estimation module.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: April 21, 2020
    Assignee: LSIS CO., LTD.
    Inventor: Kyoung-Sue Kim
  • Patent number: 10622926
    Abstract: A controller of a DC brushless motor and a control method thereof are disclosed. The controller is connected to a commutation circuit including three voltage dividers and three comparators. Each voltage divider includes a first resistor and a second resistor connected in series. Each first resistor is connected to a terminal voltage of three-phase coils of the DC brushless motor. Each comparator includes a positive input end connected to a node connected to the first resistor and the second resistor of the corresponding voltage divider and a negative input end connected to the node of the adjacent voltage divider. The controller includes a control circuit and three bias resistors respectively connected to a voltage source and the node of the corresponding voltage divider. The control circuit detects a counter EMF signal of each phase coil and controls the voltage source to supply an offset voltage to the corresponding node.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: April 14, 2020
    Assignee: JYEN HERR ENTERPRISE CO., LTD.
    Inventors: Kevin Yao, Chien-Wei Lai
  • Patent number: 10541599
    Abstract: A soft-start control circuit includes first to third inverters, first to third comparators, first to fourth resistors, first to fourth D-type flip-flops and a NOR gate. The first comparator outputs a first trigger signal. The second comparator outputs a second trigger signal. The third comparator outputs a third trigger signal. The first D-type flip-flop outputs a first error amplification ready signal. The second D-type flip-flop outputs a second error amplification ready signal. The third D-type flip-flop outputs a high-level output voltage ready signal. The fourth D-type flip-flop outputs a low-level output voltage ready signal. The NOR gate receives an inverted signal of a high-level output voltage enable signal and the third trigger signal and outputs a high-level output voltage control signal to prevent an inrush current of the DC-DC conversion system during a startup process.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: January 21, 2020
    Assignee: Raydium Semiconductor Corporation
    Inventors: Shen-Xiang Lin, Hsuan-Hao Chien, Chih-Jen Hung
  • Patent number: 10361682
    Abstract: A filter for use with a brushless DC motor to filter a signal received from a floating terminal of the brushless DC motor, wherein the filter is configured such that a time delay introduced by the filter to the signal received from the floating terminal is equal to the time taken for a rotor of the motor to rotate through an angle equal to half of a commutation step of the motor.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: July 23, 2019
    Assignee: Ultra Electronics Limited
    Inventor: Andrew Ceri Davis
  • Patent number: 10326387
    Abstract: A phase detecting device includes a signal level detector configured to detect a first level of a signal according to a phase of a rotor of a motor, a level memory configured to store the first level of the signal preliminarily detected at each phase of the rotor as a second level of the signal at the phase of the rotor, and a phase detector configured to detect the phase of the rotor based on the second level of the signal inputted from the signal level detector.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: June 18, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomohiko Kamatani
  • Patent number: 10243492
    Abstract: A semiconductor device includes a pulse generation circuit which generates a pulse control signal for selectively supplying currents to the coils with the coil phases of the brushless DC motor, a selector circuit which selects arbitrary two signals, from detection signals corresponding to currents flowing respectively to the coils and a reference signal, a comparator circuit which compares the two signals selected by the selector circuit, timer counter, and a control circuit. The control circuit repeatedly controls an operation for the pulse generation circuit to output a pulse control signal for supplying electricity to one of the coil phases in a state where the rotor is stopped, an operation for the selector circuit selects the reference signal and one of the detection signals, from the detection signals.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: March 26, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Atsuko Maekawa, Yuuki Akashi, Tetsuhiko Inoue, Futoshi Hosoya
  • Patent number: 10224846
    Abstract: A sheet conveying apparatus for conveying a sheet includes a conveyance roller, a motor, a phase determiner, and a controller. The phase determiner determines a rotor rotation phase of the motor that drives the conveyance roller to convey the sheet. The controller controls so that a value of a rotor torque current component becomes a target value of the torque current component and controls so that an excitation current component value becomes a target value of the excitation current component, and controls to reduce a deviation between a command phase and the determined rotation phase. The controller controls so that a magnetic flux penetrating through a winding is weaker than a magnetic flux of the rotor, and so that a magnetic flux penetrating through the winding in a second period is stronger than the magnetic flux penetrating through the winding in the first period.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: March 5, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuta Nito
  • Patent number: 10158306
    Abstract: A method for determining the state of a brushless motor having first, second and third phases, in some embodiments, comprises: decoupling said motor from a power source; determining whether said motor is rotating or non-rotating; if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is within a predetermined range of said common voltage; and if the first phase voltage state and the second phase voltage state are the same, repeating said determination as to whether the motor is rotating or non-rotating.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: December 18, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Fumio Kumazawa
  • Patent number: 10077069
    Abstract: A sensor device includes a main sensor, a sub sensor, and an Electronic Control Unit (ECU). The ECU has a torque calculator that sets, as a steering torque, a main steering torque that is calculated based on a main sensor signal when a main output signal is normal. During a transition period between an abnormality detection and an abnormality establishment regarding the main output signal, the torque calculator calculates the steering torque based on (i) a sub steering torque calculated based on a sub sensor signal and (ii) a prior-to-abnormality-detection main steering torque. In such manner, even when abnormality is detected in a part of the sensor signals, a fluctuation of the steering torque due to, or accompanying, the switching of the steering torque calculation to a normal signal only calculation is prevented.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: September 18, 2018
    Assignee: DENSO CORPORATION
    Inventors: Shuji Kuramitsu, Katsuhiko Hayashi, Takaharu Kozawa, Kouichi Nakamura, Masaya Taki, Toshimitsu Sakai
  • Patent number: 10079554
    Abstract: A hybrid rectifier is provided including a top diode for conducting current during a positive current portion of a line current, a top transistor connected in parallel to the top diode, a bottom diode for conducting current during a negative current portion of the line current, and a bottom transistor connected in parallel to the bottom diode. A hybrid-rectifier controller is connected to the top transistor and the bottom transistor for implementing a transistor control strategy such that, during the positive current portion of the line current, the top diode conducts current and the bottom transistor conducts current only when the line current is below a sinusoidal reference current. Similarly, during the negative current portion of the line current, the bottom diode conducts current and the top transistor conducts current only when the line current is above the sinusoidal reference current.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: September 18, 2018
    Assignee: IMALOG INC.
    Inventor: Marco Tremblay
  • Patent number: 9780705
    Abstract: A single phase brushless DC motor comprises a Hall effect sensor, a coil assembly and a motor control circuit which generating a driving signal to guide a coil current flowing through the coil assembly. The Hall effect sensor senses the magnetic pole of the rotor to accordingly generate a Hall effect signal. The motor control circuit outputs a current polarity reverse signal according to the voltage at one end of the coil assembly. The time when the current polarity reverse signal is generated corresponds to the polarity reverse time of the coil current. The motor control circuit adjusts the phase of the driving signal according to the polarity reverse time of the Hall effect signal and the time when the current polarity reverse signal is generated to synchronize the phase of the back emf of the single phase brushless DC motor with the phase of the coil current.
    Type: Grant
    Filed: January 24, 2016
    Date of Patent: October 3, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Yi-Fan Lin, Chien-Sheng Lin, Chung-Hung Tang, Chun-Lung Chiu
  • Patent number: 9768717
    Abstract: A driver device for driving a DC motor using PWM modulated drive signals includes comparator circuits for producing digitalized Back-EMF signals having first and second values as a function of the Back-EMF signals being above or below a respective threshold, and an inverter for driving the PWM modulated drive signals in a phased relationship with the digitalized Back-EMF signals. The driver device also includes controller circuits configured for controlling the respective threshold by minimizing the error between a time measured between two consecutive opposed edges of the digitalized Back-EMF signal and half a time measured between two consecutive homologous edges of the digitalized Back-EMF signal.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: September 19, 2017
    Assignee: STMicroelectronics S.r.l.
    Inventors: Giuseppe D'Angelo, Virginia Clemente, Michele Bisogno
  • Patent number: 9682835
    Abstract: A phase detector is provided. The phase detector includes a signal selector, a bias level generator, and a phase information detector. The signal selector selects, as a selected sensor signal, one of a plurality of sensor signals each having a signal level corresponding to a phase of a rotor. The bias level generator divides a signal level difference between a pair of sensor signals, including the selected sensor signal and other sensor signal of the plurality of sensor signals other than the selected sensor signal, at a first ratio, to generate a first bias level. The phase information detector generates a threshold level corresponding to the phase of the rotor based on the first bias level, and detects the signal level of the selected sensor signal reaching the threshold level.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: June 20, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventor: Tomohiko Kamatani
  • Patent number: 9400179
    Abstract: A position sensing system including a waveguide, a magnet movable relative to the waveguide, and a compensator configured to compensate for a change in propagation velocity of the waveguide in determining a position of the magnet relative to the waveguide. The compensator coupled to the waveguide and configured to receive a pulse, an end of line pulse corresponding to the pulse transmitted through the waveguide, and a reflected pulse corresponding to a reflection of the pulse at a point in the waveguide. The compensator configured to determine the point based at least in part on the pulse, the end of line pulse, and/or the reflected pulse.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: July 26, 2016
    Assignee: Littelfuse, Inc.
    Inventors: Efrem Fesshaie, Brian Johnson
  • Patent number: 9347489
    Abstract: A predetermined timing is a timing at which the sampling timing is in a vicinity of a maximum peak position of the carrier wave signal and a timing at which the sampling timing is in a vicinity of a minimum peak position. The demodulation arithmetic section outputs, as the demodulation calculated result, a value d3 calculated with d3=(d1?d2)/2 when a data value of the digital signal sampled in the vicinity of the maximum peak position is denoted by d1 and a data value of the digital signal sampled in the vicinity of the minimum peak position is denoted by d2.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: May 24, 2016
    Assignee: Shimadzu Corporation
    Inventor: Junichiro Kozaki
  • Patent number: 9306480
    Abstract: A method for controlling an ECM motor to output a constant torque. The method includes: 1) entering a target torque value T0 from an external device; when the motor is in a non-use state, starting the motor, and allowing the microprocessor to acquire an original output voltage value P chopped by a PWM signal; when the motor is in a running state, allowing the microprocessor to acquire a current output voltage value P chopped by the PWM signal; 2) enabling the microprocessor to calculate a target bus current value Itad using the function Itad=F(T,P) according to the target torque value T0 and the output voltage value P chopped by the PWM signal; and detecting a real-time bus current Ibus; and 3) allowing the microprocessor to compare the target bus current value Itad with the real-time bus current Ibus for conducting a closed-loop control.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: April 5, 2016
    Assignee: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.
    Inventor: Yong Zhao
  • Patent number: 9257924
    Abstract: A method for determining the rotary position of the rotor of an electric machine, which includes star-connected phase conductors, wherein a measurement signal representing the rotary position of the rotor within a magnetic half-period is determined from the potential at the star point. At a measurement time a specified voltage is applied to the ends of all the phase conductors by forcing the star point to a specific potential. At a time following the measurement time a voltage that deviates from the specified voltage is applied to the ends of one of the phase conductors. Then the measurement signal is derived from the current that develops from the measurement time in a connection of the star point to the specified potential.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: February 9, 2016
    Inventor: Rolf Strothmann
  • Patent number: 9024565
    Abstract: An anti-rebounding control apparatus is provided, which includes an anti-rebounding controller outputting a first command for setting a torque limit value to “0” if an electric motor speed value is equal to or smaller than an upper threshold value and equal to or larger than a lower threshold value in the case where a speed command value of “0” is input and outputting a second command for setting the torque limit value to a maximum value if the electric motor speed value is smaller than the lower threshold value, a torque regulator setting the torque limit value to “0” when the first command is input and setting the torque limit value to the maximum value when the second command is input, and an electric motor inverter intercepting a power that is supplied to an electric motor if the torque limit value is set to “0” and re-supplying the power to the electric motor if the torque limit value is set to the maximum value.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 5, 2015
    Assignee: Volvo Construction Equipment AB
    Inventor: Ji-Yun Kim
  • Publication number: 20150115851
    Abstract: A method for controlling an ECM motor to output a constant torque. The method includes: 1) entering a target torque value T0 from an external device; when the motor is in a non-use state, starting the motor, and allowing the microprocessor to acquire an original output voltage value P chopped by a PWM signal; when the motor is in a running state, allowing the microprocessor to acquire a current output voltage value P chopped by the PWM signal; 2) enabling the microprocessor to calculate a target bus current value Itad using the function Itad=F(T,P) according to the target torque value T0 and the output voltage value P chopped by the PWM signal; and detecting a real-time bus current Ibus; and 3) allowing the microprocessor to compare the target bus current value Itad with the real-time bus current Ibus for conducting a closed-loop control.
    Type: Application
    Filed: July 14, 2014
    Publication date: April 30, 2015
    Inventor: Yong ZHAO
  • Patent number: 9018872
    Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 28, 2015
    Assignees: Minebea Co., Ltd., Panasonic Corporation
    Inventors: Tomohiro Inoue, Yuji Hamada
  • Patent number: 9000696
    Abstract: The system discloses structure for synchronizing sequential phase switching in driving a set of stator windings of a multi-phase sensorless brushless permanent magnet DC motor. A drive voltage drives a plurality of the stator windings thereby producing a magnetic field. On an undriven stator winding among the stator windings, a voltage induced by the magnetic field is sampled. The induced voltage changes as a function of a magnetic rotor transitioning across a plurality of angular positions. A first value corresponding to the sampled voltage induced on the currentless winding is compared with a commutation threshold to determine a proper commutation point. The system is switched to a next drive configuration of the sequence when the first value surpasses the threshold.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: April 7, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Stephen James Sanchez, Marc John Kobayashi, Branislav Pjetar
  • Patent number: 9000705
    Abstract: There is provided a power controller including a drive circuit connected to a DC power supply to apply a first voltage to the drive circuit and configured to supply power to an external load, a current detection circuit configured to detect a current flowing in the drive circuit by converting the current into a second voltage corresponding to the current, and a current-voltage control unit configured to generate a reference voltage corresponding to a limit value of the current flowing in the drive circuit when the first voltage is applied to the drive circuit, and configured to control the drive circuit to operate in a desired current according to the first voltage, based on a comparison result of the reference voltage and the second voltage.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: April 7, 2015
    Assignee: Minebea Co., Ltd.
    Inventors: Hiroyuki Kaidu, Masato Aoki
  • Publication number: 20150077026
    Abstract: A motor control apparatus includes: duty calculation units that calculate a duty of a PWM signal based on a deviation between a value of a physical quantity of a motor with a command value; and a duty setting unit that performs setting of the duty based on the duty calculated by the duty calculation units. The duty setting unit maintains a present duty until new duty is input from any one of the plurality of duty calculation units, and updates the duty from the present duty to the new duty when the new duty is input from any one of the plurality of duty calculation units. A PWM signal generation unit generates the PWM signal based on the duty set by the duty setting unit and a carrier signal generated by a carrier signal generation unit.
    Type: Application
    Filed: September 18, 2014
    Publication date: March 19, 2015
    Applicant: OMRON AUTOMOTIVE ELECTRONICS CO., LTD.
    Inventors: Naoyuki Ito, Hirotaka Inoue, Kei Sato
  • Patent number: 8981704
    Abstract: Provided are a motor controller for suppressing a torque pulsation with a simple configuration and obtaining a sufficient output torque in the case of an open-type fault occurring in any one of windings of a motor and inverters, and an electric power steering device using the motor controller. In the motor controller for controlling a current supplied from and a voltage applied from a power source with respect to the motor including winding sets of a plurality of systems, when a fault determination unit (31) determines the occurrence of the open-type fault, the supply of the currents to the windings of one of the systems in which the fault has occurred is stopped by control performed on switching elements included in the inverter of the faulty system, whereas the supply of the currents to the windings of the normal system in which the fault has not occurred is continued.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: March 17, 2015
    Assignee: Mitsubishi Electronic Corporation
    Inventors: Masaya Endo, Isao Kezobo, Yoshihiko Kimpara, Jiro Okada
  • Publication number: 20150069940
    Abstract: A multi-phase motor control method controls a multi-phase motor which includes multiple nodes respectively receiving a corresponding number of driving voltage signals to control a rotation of a rotor. The motor control method includes: sensing a signal phase of a current signal corresponding to at least one node, for example by sensing a zero-crossing point of the current signal; determining a reference phase for the current signal; calculating a phase difference between the signal phase and the reference phase; and controlling a phase switching frequency of the stator according to the phase difference, such that the signal phase is close to or in phase with the reference phase, to thereby obtain an optimum rotation speed of the rotor corresponding to a given driving voltage. The present invention also provides a multi-phase motor control device using the motor control method.
    Type: Application
    Filed: August 18, 2014
    Publication date: March 12, 2015
    Applicant: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Kuo-Chung Lee, Wei-Hsu Chang, An-Tung Chen, Chun-Wen Wang
  • Publication number: 20150061555
    Abstract: A motor control apparatus has an inverter circuit having a plurality of pairs of upper and lower arms provided so as to correspond to the number of phases, and switching elements provided on each of the upper arms and the lower arms of each phase that drive a motor on the basis of ON or OFF operations of the respective switching elements, a single current detector that detects a current of the motor flowing through the inverter circuit, and a duty calculator that calculates duties of a PWM signals for turning the switching elements ON or OFF on the basis of a deviation between a current value of the current detected by the current detector and a target current value.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Applicant: OMRON AUTOMOTIVE ELECTRONICS CO., LTD.
    Inventors: Masamitsu Hamasaki, Takenobu Nakamura, Shinichi Kuratani
  • Publication number: 20150054437
    Abstract: A motor driving apparatus according to an embodiment includes a brushless motor. The motor driving apparatus includes a position sensor that outputs a position detection signal in synchronization with a phase of an induced voltage of a coil of the brushless motor. The motor driving apparatus includes a semiconductor integrated circuit that controls driving of the brushless motor by supplying a pseudo sine-wave driving voltage from an energization terminal to the coil of the brushless motor based on the position detection signal and a command signal that prescribes driving of the brushless motor.
    Type: Application
    Filed: August 21, 2014
    Publication date: February 26, 2015
    Inventors: Naoki Oomura, Kazunobu Nagai, Toshimitsu Aizawa, Sadao Ikeda, Jun Sodesawa, Hiroyuki Ishida
  • Patent number: 8957617
    Abstract: The present invention discloses a controller and a method for improving motor driving efficiency. According to the present invention, multiple control parameters are inputted to the controller so that the controller can adjust timings of PWM driving signals for driving the motor to advance or delay the turned-ON or turned-OFF points, whereby the motor is driven efficiently.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: February 17, 2015
    Assignee: Padauk Technology Co., Ltd.
    Inventor: Mao-Hsin Cheng
  • Publication number: 20150022129
    Abstract: A circuit includes a processor that analyzes a pulse width modulated (PWM) signal feedback from a brushless DC motor to determine a transition between a mutual inductance zero crossing condition and a Back Electro Motive Force (BEMF) zero crossing condition of the brushless DC motor. A mutual inductance controller is executed by the processor to commutate the brushless DC motor at startup of the motor when the mutual inductance zero crossing condition is detected by the processor. A BEMF controller is executed by the processor to commutate the brushless DC motor after startup of the motor when the BEMF zero crossing condition is detected by the processor.
    Type: Application
    Filed: December 5, 2013
    Publication date: January 22, 2015
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: YISONG LU, RUOCHEN ZHANG, WEI ZUO
  • Patent number: 8933657
    Abstract: A method for driving a brushless direct current (DC) motor is provided. The brushless DC motor has a first phase that is coupled between a first terminal and a common node, a second phase that is coupled between a second terminal and the common node, and a third phase that is coupled between a third terminal and the common node. The first and second phases are coupled to a first supply rail and a second supply rail, respectively, such that the brushless DC motor is in a first commutation state. The first phase is then decoupled from the first supply rail so as to allow first terminal to float during a window period. A first voltage difference between the first terminal and the second terminal is compared to a second voltage difference between the third terminal and the second terminal during the window period, and the brushless DC motor is commuted to a second commutation state if the first voltage difference is approximately equal to the second voltage difference.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: January 13, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Xiaoyan Wang, Yateendra Deshpande
  • Publication number: 20150002061
    Abstract: A motor driving circuit includes a magnetic-pole-position detecting unit that detects a rotating position of a rotor of a permanent magnet synchronous motor, a voltage output unit that converts a direct-current voltage and generates a driving voltage for the permanent magnet synchronous motor, a voltage control unit that controls the voltage output unit on the basis of a comparison result of a modulation wave and a carrier wave, a voltage-phase adjusting unit that determines, using a differential amplifier circuit that receives a rotating speed control signal and an offset signal, a phase of the modulation wave generated by the voltage control unit and causes the voltage control unit to generate the modulation wave in the determined phase, and an offset generating unit that generates the offset signal.
    Type: Application
    Filed: January 27, 2012
    Publication date: January 1, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Michio Yamada, Hiroki Aso
  • Patent number: 8917043
    Abstract: A motor control circuit and associated techniques can adjust a phase of a motor drive to keep a rotational reference position of an electric motor at the same relative phase as a zero current in a motor winding at different motor speeds and as the motor accelerates and decelerates. In some embodiments, a particular circuit and technique can be used to detect the zero current in the motor winding.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: December 23, 2014
    Assignee: Allegro Microsystems, LLC
    Inventors: Timothy Reynolds, Chengyi Jin
  • Publication number: 20140361716
    Abstract: A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Inventors: Stephen Solan, JR., Brian L. Beifus, Roger C. Becerra
  • Publication number: 20140354200
    Abstract: An integrated circuit for controlling operation of a motor of a fan assembly. The fan assembly includes a housing and a fan. The motor is in the housing. The housing is void of sensors. The motor is configured to rotate the fan. The integrated circuit includes a detection module and a first control module. The detection module is separate from the fan assembly. The detection module is configured to detect a voltage induced in a first coil of the motor or a back electromotive force received from the first coil of the motor. The first control module is configured to receive a control signal from a second control module and control the operation of the fan based on (a) the control signal, and (b) the voltage induced in the first coil of the motor or the back electromotive force. The second control module is separate from the integrated circuit.
    Type: Application
    Filed: August 19, 2014
    Publication date: December 4, 2014
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong, Edy Susanto, Yayue Zhang, Cheng Yong Teoh
  • Patent number: 8901863
    Abstract: A motor control device has a motor driving circuit for driving a motor, a current detection circuit for detecting a motor current flowing through the motor driving circuit, and a controller for calculating a detected value of the motor current based on an output of the current detection circuit, comparing the detected value with a target value of the motor current, and generating a command value for allowing a motor current of the target value to flow through the motor based on a deviation therebetween, to output the command value to a motor driving circuit. The current detection circuit is configured of a first current detection circuit having a positive first gain and a second current detection circuit having a negative second gain obtained by inverting the first gain.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: December 2, 2014
    Assignee: Omron Automotive Electronics Co., Ltd.
    Inventors: Hiromi Murata, Masamitsu Hamasaki
  • Patent number: 8878472
    Abstract: A driving device capable of driving a motor more efficiently is provided. A zero-crossing detection comparator 10 compares a pair of Hall signals H+ and H? having reverse phases and representing a rotor position of a fan motor 6, and generates a level-shifted zero-crossing detection signal S1 at each zero-crossing timing when the Hall signals cross each other. A control circuit 20 receives the zero-crossing detection signal S1, switches a driving phase at each zero-crossing timing to rotationally drive the motor, and regeneratively controls the motor during a duration from a first time point ahead of each zero-crossing timing by a first time width ?1 to a second time point behind each zero-crossing timing by a second time width ?2 shorter than the first time width ?1.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: November 4, 2014
    Assignee: Rohm Co., Ltd.
    Inventors: Toshikazu Satake, Hiroyuki Ishii
  • Patent number: 8872453
    Abstract: A motor drive controller to control a motor via multiple sensors includes a first phase detector to compare respective differential pairs of the sensor signals from the same sensor to detect phases of the rotor, and output a first phase information signal; a second phase detector to compare a respective one of the multiple sensor signals with another sensor signal from the different sensor to detect the phases and output a second phase information signal; a phase divider to divide the phases, detected by the first and second phase detectors, into multiple predetermined phase intervals; a signal selector to select one of the multiple sensor signals in the multiple predetermined phase intervals; and a third phase detector to detect whether the signal selected by the signal selector reaches a predetermined threshold level corresponding to a predetermined phase of the rotor, and output a third phase information signal.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: October 28, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kamatani, Haruyuki Suzuki, Fumihiro Shimizu, Katsuhisa Furuse
  • Publication number: 20140312816
    Abstract: The system contains a controller unit comprising a memory device, a processing unit, and at least one analog-to-digital converter. A power stage has a plurality of switches, wherein the power stage receives a control signal from the control circuit and a power signal from a power source. The power stage drives two windings of the set of three stator windings to rotate a rotor and maintains one stator winding of the three stator windings undriven. The memory device stores a plurality of values for the driven current and a plurality of demodulated undriven winding voltages. The processing unit compares the plurality of values and periodically calculates a rotor sextant while the rotor rotates. The processing unit compares at least two demodulated undriven winding voltage values corresponding to at least two current values within the rotor sextant to calculate the rotor sextant parity and verify the calculation of the rotor sextant.
    Type: Application
    Filed: March 13, 2014
    Publication date: October 23, 2014
    Applicant: Cirrus Logic, Inc.
    Inventors: Branislav Pjetar, Marc J. Kobayashi
  • Patent number: 8866421
    Abstract: A motor drive controller to drive a motor, based on multiple sensors that generates multiple sensor signals corresponding to different positions of the rotor; including a first phase detector to compare a respective one of the multiple sensor signals with a paired sensor signal from the same sensor to detect phases of the rotor, and output a first phase information signal representing a first detected phase; a phase divider to divide the phases, detected by the first phase detector into multiple predetermined phase intervals; a signal selector to select one of the respective multiple sensor signals from the multiple sensors in the multiple predetermined phase interval; and a second phase detector to detect whether the signal selected by the signal selector reaches a predetermined threshold level corresponding to a predetermined phase of the rotor, and output a second phase information signal representing a second detected phase.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: October 21, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kamatani, Haruyuki Suzuki, Fumihiro Shimizu, Katsuhisa Furuse
  • Patent number: 8853980
    Abstract: A soft switching control circuit for a DC motor is provided. The soft switching control circuit has an absolute value generating circuit, a threshold voltage generating circuit, and a comparing circuit. The absolute value generating circuit outputs an absolute value signal according to a pair of Hall signals from the DC motor. The threshold voltage generating circuit receives a detected state signal and at least an end voltage of a coil of the DC motor for determining a current on the coil at an actual state change time defined by the detected state signal. According to the determination, the threshold voltage generating circuit outputs a threshold voltage with an adjusted voltage level. The comparing circuit compares the absolute value signal and the threshold voltage so as to generate a state change adjusting signal for modifying the actual state change time.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: October 7, 2014
    Assignee: Niko Semiconductor Co., Ltd.
    Inventors: Chia-Jung Chang, Wei-Line Chang
  • Patent number: 8847537
    Abstract: A motor driving device and a driving method thereof is disclosed herein and comprises a PWM converting circuit, an oscillator, a comparator, a controlling unit. The PWM converting circuit converts an analog signal according to an adjustable the highest setting voltage, an adjustable the lowest setting voltage and a controlling signal. The analog signal and a triangular signal generated by the oscillator are inputted to the comparator to compare to output a drive signal to the controlling unit so as to control the motor speed. The motor driving device in the present invention can adjust the motor rotating speed curve to set the lowest rotating speed of the motor so as to achieve the function of changing the motor rotating speed and maintain the lowest torque of the motor to increase the flexibility of the motor speed control.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: September 30, 2014
    Assignee: AMtek SEMICONDUCTOR Co., Ltd.
    Inventors: Teng-Hui Lee, Kuo-Yung Yu