Patents by Inventor Kazunori Hatakeyama

Kazunori Hatakeyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9829234
    Abstract: A heat pump device includes an inverter control unit outputting PWM signals to an inverter; a current detection unit detecting a current value flowing in the inverter and outputting the current value after reducing a current value having a first frequency or higher in detected current value; and a drive-signal stop unit that, when the current value output from the current detection unit is equal to or larger than an interruption level, stops output of PWM signals to the inverter. Particularly, the inverter control unit generates a voltage command value such that the voltage command value becomes a value equal to or larger than a lower limit determined according to the first frequency and generates PWM signals based on generated voltage command value and a carrier signal, thereby causing a voltage output time to the motor to be a predetermined time or longer.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: November 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Syota Kamiya, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Patent number: 9825575
    Abstract: A power converting apparatus outputs an alternating-current power to drive an electric motor, and includes: a switching circuit that converts an input direct-current power to an alternating-current power based on driving of MOS-FETs and outputs the alternating-current power; and a driving control unit capable of controlling a carrier frequency and controlling the driving of the MOS-FETs. The driving control unit controls the carrier frequency on the basis of a noise level of a carrier noise obtained by combining noises that occur in the electric motor and the power converting apparatus due to the driving of the MOS-FETs at the carrier frequency and a noise level of driving noises from a plurality of noise sources that occur irrespective of the carrier frequency in the same housing in which the power converting apparatus and the electric motor are contained.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: November 21, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Yamakawa, Koichi Arisawa, Kazunori Hatakeyama, Yosuke Shinomoto
  • Patent number: 9825488
    Abstract: A power supply switching device and switch board checks whether or not a primary-side voltage of a remote shutoff breaker and a secondary-side voltage thereof become a rated voltage after a commercial power system is recovered from a blackout. Next, when both primary-side voltage and secondary-side voltage become the rated voltage, a contactor is actuated to interconnect a home power system with the commercial power system. Hence, charging of the home power system without causing a user to notice such a charging upon recovery of the commercial power system from a blackout can be prevented. As a result, the safety for the user can be ensured.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: November 21, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Takashi Yamakawa, Makoto Kasugai, Naohide Tsuchimoto
  • Patent number: 9816737
    Abstract: A DC power-supply device that suppresses an excessive inrush current, can prevent breakage of elements and burnout of circuits, and converts alternating current from a three-phase AC power supply into direct current to supply it to a load, includes a rectifier circuit having a reactor connected to input or output side thereof and rectifying the alternating current from the three-phase AC power supply; first and second capacitors and connected in series between output terminals to the load; a charging unit selectively charges one or both of the first and second capacitors; and a control unit controlling the charging unit. When charging of the first and second capacitors is started, the control unit reduces the on-duty ratio, and then, until the on-duty ratio during a normal operation is reached, the control unit executes control such that the on-duty ratio is gradually increased as a predetermined time period is passed.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: November 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Norikazu Ito, Kenta Yuasa, Shoji Isoda
  • Patent number: 9806594
    Abstract: A drive device driving a power converter that includes a switching element formed from a wide bandgap semiconductor, includes a PWM-signal output unit that generates a drive signal that drives the switching element with PWM; an on-speed reducing unit that, when the switching element is changed from off to on, reduces a change rate of the drive signal; and an off-speed improving unit that, when the switching element is changed from on to off, draws charge from the switching element at a high speed and with a charge drawing performance higher than that at a time when the switching element is changed from off to on.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: October 31, 2017
    Assignee: MITSUBISHI CORPORATION
    Inventors: Yosuke Shinomoto, Michio Yamada, Kazunori Hatakeyama, Takuya Shimomugi
  • Patent number: 9800077
    Abstract: The DC power-supply device includes a rectifier circuit rectifying an alternating current, a reactor connected to an input or output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit that selectively charges one or both of the first capacitor and the second capacitor. A ratio, to a period obtained by combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, of the non-charging period, is controlled according to an operating condition of the load, to change a charging frequency of the first capacitor and the second capacitor based on the ratio, at the time of controlling an output voltage to the load.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: October 24, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Keisuke Uemura, Yosuke Shinomoto
  • Publication number: 20170292733
    Abstract: The present invention includes a plurality of fan motors, first and second inverters for individually driving the fan motors, respectively, and one and a common control unit that performs a control arithmetic for each of the fan motors and generates an individual driving signal given to each of the inverters.
    Type: Application
    Filed: September 26, 2014
    Publication date: October 12, 2017
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Yosuke SHINOMOTO, Mitsuo KASHIMA, Takashi MATSUMOTO
  • Publication number: 20170279377
    Abstract: A motor drive apparatus driving a motor as a three-phase motor converting direct current into three-phase alternating current, includes: inverter modules and equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.
    Type: Application
    Filed: November 4, 2014
    Publication date: September 28, 2017
    Inventors: Takuya SHIMOMUGI, Yosuke SHINOMOTO, Koichi ARISAWA, Kazunori HATAKEYAMA
  • Patent number: 9772131
    Abstract: A heat pump device capable of efficiently and reliably preventing a liquid refrigerant from stagnating in a compressor an air conditioner, a heat pump water heater, a refrigerator, and a freezing machine including the heat pump device. The configuration is such that, when the compressor is under operation standby, a high-frequency voltage synchronizing with a carrier signal is supplied to the compressor motor to carry out the locked energization of the compressor motor. From respective inter-phase voltages, respective phase voltages, or respective phase currents of the compressor motor for a plurality of high-frequency energization cycles, the detection values for one high-frequency energization cycle are restored. A power value calculated using the restored detection values for one high-frequency energization cycle is controlled to coincide with a heating power command necessary for discharging the liquid refrigerant stagnated in the compressor to the outside of the compressor.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: September 26, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Shota Kamiya, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube
  • Publication number: 20170272006
    Abstract: A power conversion apparatus includes: an inverter to drive a motor, using a first carrier signal; an inverter connected in parallel to the inverter, to drive a motor, using a second carrier signal; respective phase lower arm shunt resistors to detect a first current flowing inside the inverter; respective phase lower arm shunt resistors to detect a second current flowing in the inverter; and a control unit to control the inverters. A phase difference is set between the first carrier signal and the second carrier signal to prevent a detection period for the first current in the first carrier signal and a detection period for the second current in the second carrier signal from overlapping each other when the inverters are controlled.
    Type: Application
    Filed: September 5, 2014
    Publication date: September 21, 2017
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Yosuke SHINOMOTO, Mitsuo KASHIMA, Takashi MATSUMOTO
  • Patent number: 9746216
    Abstract: A heat pump device includes: a compressor that compresses a refrigerant; a motor that drives the compressor; a wiring switching unit that switches a wiring structure of the motor; an inverter that applies a desired voltage to the motor; and an inverter control unit that generates a PWM signal for driving the inverter, that includes, as an operation mode, a heating operation mode in which a heating operation is performed on the compressor and a normal operation mode in which a refrigerant is compressed by performing a normal operation on the compressor, and that controls a switching operation of the wiring switching unit in accordance with an operation mode.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: August 29, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Yamakawa, Kazunori Hatakeyama, Shota Kamiya, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20170241691
    Abstract: A heat pump apparatus includes a compressor compressing a refrigerant, a motor driving the compressor, an inverter device, and an inverter control unit controlling the inverter device. The inverter device includes the same number of bridge circuits as those of phases of the motor, and each of the bridge circuits includes plural pairs of series-connected switching elements. The pairs of switching elements are connected in parallel. The inverter device applies to the motor a high-frequency voltage of a frequency at which the motor does not rotate.
    Type: Application
    Filed: November 4, 2014
    Publication date: August 24, 2017
    Inventors: Takashi YAMAKAWA, Kazunori HATAKEYAMA, Takuya SHIMOMUGI, Yosuke SHINOMOTO
  • Patent number: 9739515
    Abstract: A heat pump device includes a compressor including a compression mechanism that compresses a refrigerant and a motor that drives the compression mechanism, an inverter that applies a voltage for driving the motor, a converter that applies a voltage to the inverter, an inverter control unit that generates a driving signal for driving the inverter, and a converter control unit that generates a driving signal for driving the converter. The inverter control unit includes a heating-operation-mode control unit that controls a driving-signal generating unit such that the driving-signal generating unit outputs, as inverter driving signals, PWM signals for heating the compressor without rotationally driving the motor by feeding a high-frequency current that the motor cannot follow in a heating operation mode.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20170237380
    Abstract: A heat pump device includes a compressor compressing refrigerant; a motor driving the compressor; an inverter applying alternating-current voltage to the motor; and an inverter control unit generating a control signal for controlling the inverter. The inverter control unit executes control by using a first switching pattern in which all of three switching elements on a positive or negative voltage side of the inverter are changed to an ON state, then executes control by using a second switching pattern in which two switching elements to which electric current flows in the same direction when controlled by using the first switching pattern are changed to an OFF state, and then executes control by using a third switching pattern in which two switching elements on a reverse voltage side of the two switching elements changed to an OFF state by using the second switching pattern are changed to an ON state.
    Type: Application
    Filed: September 26, 2014
    Publication date: August 17, 2017
    Inventor: Kazunori HATAKEYAMA
  • Publication number: 20170214354
    Abstract: A power converting apparatus outputs an alternating-current power to drive an electric motor, and includes: a switching circuit that converts an input direct-current power to an alternating-current power based on driving of MOS-FETs and outputs the alternating-current power; and a driving control unit capable of controlling a carrier frequency and controlling the driving of the MOS-FETs. The driving control unit controls the carrier frequency on the basis of a noise level of a carrier noise obtained by combining noises that occur in the electric motor and the power converting apparatus due to the driving of the MOS-FETs at the carrier frequency and a noise level of driving noises from a plurality of noise sources that occur irrespective of the carrier frequency in the same housing in which the power converting apparatus and the electric motor are contained.
    Type: Application
    Filed: July 4, 2014
    Publication date: July 27, 2017
    Inventors: Takashi YAMAKAWA, Koichi ARISAWA, Kazunori HATAKEYAMA, Yosuke SHINOMOTO
  • Patent number: 9692289
    Abstract: A DC power-supply device that suppresses an increase of a harmonic current and deterioration of a power factor without causing any imbalance among respective phase currents, in a configuration in which a three-phase alternating current is converted into a direct current and supplied to a load. The DC power-supply device includes a rectifier circuit, a reactor connected to an input side or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit. During a cycle combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, the charging unit is controlled so that a charging frequency becomes 3n times (n is a natural number) the frequency of the three-phase alternating current.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 27, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Norikazu Ito, Kenta Yuasa, Shoji Isoda
  • Patent number: 9685800
    Abstract: A charging/discharging device includes a charging/discharging connector that electrically connects a storage battery and the charging/discharging device, a cable that is connected to the charging/discharging connector at one end and is connected to the charging/discharging device at the other end, a power conversion unit, a control unit that controls an operation of the power conversion unit, and an abnormality detection unit that outputs an abnormality detection signal for stopping an operation of the power conversion unit to at least any of the control unit and the power conversion unit, when an output from a comparator and an ON signal from the control unit are input to an AND circuit.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: June 20, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Yosuke Shinomoto, Takashi Yamakawa
  • Publication number: 20170153051
    Abstract: A direct-current power supply device is a direct-current power supply device that converts a three-phase alternating current to a direct current and supplies the direct current to a load, and includes a first capacitor and a second capacitor connected in series between output terminals to the load, a charge unit that selectively charges one or both of the first capacitor and the second capacitor, and a control unit that controls the charge unit. The control unit controls an output voltage of the direct-current power supply device by a charging period of the charge unit, and also controls a power factor and a harmonic current of the direct-current power supply device by a charge timing with respect to a reference phase of the three-phase alternating current of the charge unit as a reference.
    Type: Application
    Filed: June 5, 2014
    Publication date: June 1, 2017
    Inventors: Kazunori HATAKEYAMA, Keisuke UEMURA, Yosuke SHINOMOTO
  • Patent number: 9651289
    Abstract: An adder adds a phase ?plus, which is n times a size of 60 degrees, to a phase output from a phase switching unit and outputs the phase as a voltage command phase ?. A voltage generation unit generates voltage command value based on the voltage command phase output by the adder and outputs the command value. A drive-signal generation unit, based on an output from the voltage generation unit generates drive signals corresponding to respective switching elements of an inverter, and outputs respective generated drive signals to the corresponding switching elements of the inverter, and generates a high-frequency AC voltage in the inverter.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: May 16, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Takuya Shimomugi, Shinya Matsushita, Naoki Wakuta, Tsutomu Makino, Shinsaku Kusube
  • Patent number: 9628003
    Abstract: A direct-current power supply device includes a rectifier connected to a power supply, a charge storage unit configured by a first capacitor and a second capacitor connected in series, a switching unit configured by a first switching element 4a and a second switching element connected in series and backflow preventing elements that suppress a backflow of electric charges from the charge storage unit, a reactor, a control unit that controls operations of the first switching element and the second switching element, and a direct-current-voltage detecting unit that detects a first both-end voltage, which is a voltage across the first capacitor, and a second both-end voltage, which is a voltage across the second capacitor. The control unit detects, on the basis of a voltage difference between the first both-end voltage and the second both-end voltage, a short-circuit failure of one of the first switching element and the second switching element.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: April 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Shota Kamiya