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: 9618249
    Abstract: A voltage-command correction-value computation unit outputs a correction value for correcting a voltage command value according to a bus voltage. A multiplier calculates a voltage command value acquired by correcting the voltage command value based on the correction value. A voltage-command generation unit generates and outputs three-phase voltage command values based on the corrected voltage command value calculated by the multiplier and a phase. A PWM-signal generation unit generates six drive signals corresponding to switching elements of an inverter based on the three-phase voltage command values outputted by the voltage-command generation unit and a carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inerter to generate a high-frequency AC voltage.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: April 11, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20170016655
    Abstract: A first reactor is provided on the input side of a rectifying circuit that rectifies AC power (on the side of an AC power supply), and on the output side of the rectifying circuit (on the side of a load), first and second capacitors that are connected in series to each other, and first and second switching elements that switch between charging and not charging of the first and second capacitors, respectively, are provided, a second capacitor group in Y-connection, provided with three capacitors, each of which is connected to each phase-terminal of the first reactor on the side of the rectifying circuit, is connected to the midpoint of the first and second switching elements, and the output voltage to the load is boosted, while the on-duty of the first switching element and the on-duty of the second switching element are controlled to be equal to each other.
    Type: Application
    Filed: February 19, 2014
    Publication date: January 19, 2017
    Inventors: Yosuke SHINOMOTO, Kazunori HATAKEYAMA, Shota KAMIYA, Keisuke UEMURA
  • Patent number: 9543887
    Abstract: A selection unit switches between a phase ?p and a phase ?n different from the phase ?p substantially by 180 degrees, and outputs one of them in synchronization with a carrier signal. A voltage-command generation unit generates and outputs three-phase voltage command values Vu*, Vv* and Vw* based on the phase outputted by the selection unit. A PWM-signal generation unit generates three-phase voltage command values Vu*?, Vv*? and Vw*? by correcting the three-phase voltage command values Vu*, Vv* and Vw* outputted by the voltage-command generation unit according to a predetermined method, and generates six drive signals corresponding to switching elements of the inverter based on the three-phase voltage command values Vu*?, Vv*? and Vw*? and the carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inverter to generate a high-frequency AC voltage.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: January 10, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Takuya Shimomugi, Shinya Matsushita, Naoki Wakuta, Shinsaku Kusube, Tsutomu Makino
  • Patent number: 9496816
    Abstract: An air conditioner equipped with a compressor, an indoor heat exchanger and an outdoor heat exchanger includes: an inverter circuit that drives a motor of the compressor; an inverter-power detecting unit that detects power of the inverter circuit; a PWM-signal generating unit that inverter-current detecting unit generates PWM signals for controlling the inverter circuit; a voltage-command-value generating unit that outputs voltage command values to the PWM-signal generating unit; and an accumulation detecting unit that detects accumulation of a liquid refrigerant within the compressor and outputs a detection result to the voltage-command-value generating unit, wherein when accumulation of a liquid refrigerant within the compressor is detected, the voltage-command-value generating unit outputs the voltage command value so that power of the inverter circuit has a predetermined power value.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: November 15, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Kazunori Sakanobe, Shinya Matsushita, Tsutomu Makino
  • Publication number: 20160265822
    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: Application
    Filed: October 29, 2013
    Publication date: September 15, 2016
    Inventors: Shota KAMIYA, Kazunori HATAKEYAMA, Norikazu ITO, Kenta YUASA, Shoji ISODA
  • Publication number: 20160248352
    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: Application
    Filed: October 18, 2013
    Publication date: August 25, 2016
    Inventors: Yosuke SHINOMOTO, Kazunori HATAKEYAMA, Shota KAMIYA
  • Publication number: 20160245571
    Abstract: A direct-current power supply device includes a switching unit constituted by a first switching element and a second switching element and a control unit that controls the operations of the first witching element and the second switching element. The switching unit has a first mode in which on-duty is a first value and a second mode in which the on-duty is a second value larger than the first value. When transitioning the switching unit from the first mode to the second mode, the control unit controls the switching unit such that the time until the on-duty reaches the second value is equal to or longer than a fixed time and controls, after the on-duty reaches the second value, an operation cycle of the switching unit to extend the operation cycle.
    Type: Application
    Filed: October 15, 2014
    Publication date: August 25, 2016
    Inventors: Yosuke SHINOMOTO, Kazunori HATAKEYAMA, Shota KAMIYA
  • Publication number: 20160241073
    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: Application
    Filed: November 26, 2013
    Publication date: August 18, 2016
    Inventors: Kazunori HATAKEYAMA, Keisuke UEMURA, Yosuke SHINOMOTO
  • Patent number: 9385642
    Abstract: An air conditioner includes: an outdoor fan provided in an outdoor unit; a permanent magnet synchronous motor that drives the outdoor fan; an inverter that uses a DC power source as a power source and applies a voltage to the permanent magnet synchronous motor; an inverter control means that controls the output voltage of the inverter; and a shunt resist connected between the DC power source and the inverter. If the outdoor fan is rotating due to an external force while the inverter is stopped, the inverter control means causes the inverter to operate using a brake sequence that brakes the rotation of the outdoor fan, and then causes the inverter to operate using a drive sequence that power-drives the outdoor fan.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: July 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Takashi Yamakawa, Shinsaku Kusube, Akihiro Tsumura
  • Publication number: 20160190955
    Abstract: To provide a DC power-supply device that can suppress voltage unbalance of a plurality of capacitors serially connected between both terminals of a load, achieve stable drive of the load and long life of the capacitors, and contribute to high reliability, in a configuration in which an alternating current is converted into a direct current and is supplied to a load, and a refrigeration-cycle application device including the DC power-supply device. The DC power-supply device includes a rectifier circuit, a reactor connected to an input or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, a charging unit that selectively charges one or both of the first capacitor and the second capacitor, and further includes a control unit that controls the charging unit so that voltage unbalance between the first capacitor and the second capacitor is suppressed.
    Type: Application
    Filed: September 6, 2013
    Publication date: June 30, 2016
    Inventors: Kazunori HATAKEYAMA, Shota KAMIYA, Yosuke SHINOMOTO
  • Publication number: 20160146523
    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: Application
    Filed: May 23, 2013
    Publication date: May 26, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori HATAKEYAMA, Shota KAMIYA, Kenta YUASA, Shinya MATSUSHITA, Shinsaku KUSUBE
  • Patent number: 9322587
    Abstract: A heat pump device that can efficiently feed a high-frequency current to an electric motor and effectively heat a compressor includes a compressor including a compression mechanism configured to compress a refrigerant and a motor configured to drive the compression mechanism, heat exchangers, an inverter configured to apply a voltage to the motor, and an inverter control unit configured to drive the inverter. The inverter control unit includes a stagnation detecting unit configured to determine whether heating of the compressor is necessary and notify the determination result and a high-frequency-alternating-current-voltage generating unit and a PWM-signal generating unit configured to shift to a heating operation mode when the heating is necessary and, in the heating operation mode, generate PWM signals to provide, based on a heating time carrier signal having two or more frequencies, a period in which a reflux current flows.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: April 26, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Shinsaku Kusube, Shinya Matsushita
  • Publication number: 20160079845
    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: Application
    Filed: June 25, 2013
    Publication date: March 17, 2016
    Inventors: Shota KAMIYA, Kazunori HATAKEYAMA, Norikazu ITO, Kenta YUASA, Shoji ISODA
  • Patent number: 9263984
    Abstract: A high efficiency refrigerant compressor standby heating method reduces vibrations and noise in a bearing of the compressor. The compressor comprises a motor, an inverter, an inverter controller, and a bus voltage detector to detect a bus voltage of the inverter. The inverter controller includes a dormant refrigerant detector to detect a dormant state of refrigerant in the compressor, a high-frequency AC voltage generator to output a high-frequency AC voltage command, which is out of a range of an operating frequency when the compressor is running, to a coil of the motor on the basis of an output of the dormant refrigerant detector, an amplitude, and a phase. A pulse width modulation signal generator to cause the inverter to generate a high-frequency AC voltage by generating a signal on the basis of the output of the high-frequency AC voltage generator and the output of the bus voltage detector.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: February 16, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Kazunori Sakanobe, Shinya Matsushita, Tsutomu Makino
  • Patent number: 9231507
    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: Grant
    Filed: January 27, 2012
    Date of Patent: January 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Michio Yamada, Hiroki Aso
  • Publication number: 20150288201
    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: Application
    Filed: February 13, 2013
    Publication date: October 8, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Yosuke Shinomoto, Takashi Yamakawa
  • Patent number: 9077274
    Abstract: An object of the present invention is to efficiently heat a refrigerant retained in a compressor. An inverter control unit generates six drive signals corresponding to the respective switching elements of the inverter, and outputs the generated drive signals to the corresponding switching elements of the inverter to cause the inverter to generate a high-frequency AC voltage. Particularly, the inverter control unit generates a drive signal having a switching pattern A for turning on all the three switching elements on a positive voltage side or a negative voltage side of the inverter, and subsequent thereto, generates a drive signal having a switching pattern B for turning on two switching elements of the three switching elements and turning off one switching element thereof.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: July 7, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Shinsaku Kusube, Shinya Matsushita
  • Publication number: 20150168033
    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: Application
    Filed: June 29, 2012
    Publication date: June 18, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takashi Yamakawa, Kazunori Hatakeyama, Shota Kamiya, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20150096320
    Abstract: A heat pump device includes: a compressor including a compression mechanism compressing a refrigerant and a motor driving the compression mechanism; an inverter unit applying a voltage for driving the motor; an inverter control unit generating a driving signal for driving the inverter unit; and temperature sensors detecting temperatures of the compressor, wherein the inverter control unit includes a normal operation mode in which a refrigerant is compressed by performing a normal operation of the compressor and a heating operation mode in which a heating operation of the compressor is performed by applying, to the motor, a high-frequency voltage, and in the heating operation mode, the inverter control unit determines an amplitude and a phase of a voltage command for generating the high-frequency voltage on a basis of a temperatures detected by the temperature sensors and a necessary amount of heat specified in advance.
    Type: Application
    Filed: June 20, 2012
    Publication date: April 9, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20150089972
    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, wherein the inverter control unit includes a heating operation mode in which a heating operation of the compressor is performed and a normal operation mode in which a refrigerant is compressed by performing a normal operation of the compressor and the converter control unit sets, in the heating operation mode of the inverter control unit, a voltage applied to the inverter on the basis of a voltage command value for the motor.
    Type: Application
    Filed: April 16, 2012
    Publication date: April 2, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino