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: 10281185
    Abstract: The invention includes an inverter to convert a direct-current voltage from a direct-current power supply into an alternating-current voltage and apply the alternating-current voltage to a motor that, a direct-current-voltage detecting unit to detect a voltage in the direct-current power supply, a current detecting unit to detect an electric current flowing to the inverter, and an inverter control unit to generate PWM signals for driving switching elements of the inverter based on the detected voltage the detected electric current, to set a specific phase difference between a phase of a carrier signal used for generation of the PWM signals and a phase of the alternating-current voltage, and to control the inverter such that a frequency of the PWM signals are synchronized with a frequency of the alternating-current voltage, the frequency of the PWM signals being an integer multiple of three times the frequency of the alternating-current voltage.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: May 7, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Kazunori Hatakeyama, Yosuke Shinomoto, Koichi Arisawa
  • Patent number: 10270380
    Abstract: A power converting apparatus includes: an inverter converting a direct-current voltage supplied from a power supply unit into an alternating-current voltage and outputting the alternating-current voltage to a motor; and an inverter control unit outputting synchronous PWM (Pulse Width Modulation) signals for driving switching elements of the inverter. A frequency of the synchronous PWM signals is periodically varied when periodic pulsation occurs in a load connected to the motor.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: April 23, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Kazunori Hatakeyama, Yosuke Shinomoto, Takahiko Kobayashi, Yasuhiko Wada
  • Patent number: 10211752
    Abstract: A direct-current power supply device includes a first capacitor and a second capacitor connected in series between output terminals to a load, a charging unit including a first switching element that switches charging and non-charging of the first capacitor, a second switching element that switches charging and non-charging of the second capacitor, a first backflow preventing element that prevents charged electric charges of the first capacitor from backflowing to the first switching element, and a second backflow preventing element that prevents charged electric charges of the second capacitor from backflowing to the second switching element, and a control unit that controls the first backflow preventing element to an ON state at timing when the charging of the first capacitor is started and controls the second backflow preventing element to the ON state at timing when the charging of the second capacitor is started.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kazunori Hatakeyama
  • Patent number: 10208991
    Abstract: A heat pump device includes an inverter control unit for controlling an inverter. The inverter control unit includes a constraint-energization control unit that, during operation standby of a compressor, determines whether heating to the compressor is necessary, on the basis of a refrigeration stagnation amount in the compressor, and, when having determined that heating to the compressor is necessary, selects, according to the refrigeration stagnation amount, any one of direct-current energization for supplying a direct-current voltage to the motor and high-frequency energization for supplying a high-frequency voltage having a frequency higher than a frequency during a normal operation to the motor, so as to output a constraint energization command for carrying out constraint energization of the motor; and a driving-signal generating unit that generates a driving signal on the basis of the constraint energization command.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Syota Kamiya, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Publication number: 20180358906
    Abstract: A direct-current power supply device includes a first capacitor and a second capacitor connected in series between output terminals to a load, a charging unit including a first switching element that switches charging and non-charging of the first capacitor, a second switching element that switches charging and non-charging of the second capacitor, a first backflow preventing element that prevents charged electric charges of the first capacitor from backflowing to the first switching element, and a second backflow preventing element that prevents charged electric charges of the second capacitor from backflowing to the second switching element, and a control unit that controls the first backflow preventing element to an ON state at timing when the charging of the first capacitor is started and controls the second backflow preventing element to the ON state at timing when the charging of the second capacitor is started.
    Type: Application
    Filed: February 25, 2016
    Publication date: December 13, 2018
    Inventor: Kazunori HATAKEYAMA
  • Patent number: 10128775
    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: Grant
    Filed: November 4, 2014
    Date of Patent: November 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Yosuke Shinomoto, Koichi Arisawa, Kazunori Hatakeyama
  • Patent number: 10113784
    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: Grant
    Filed: October 15, 2014
    Date of Patent: October 30, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Shota Kamiya
  • Publication number: 20180301979
    Abstract: A circuit board accommodates a plurality of different source voltages. On the circuit board, a printed wire which constitutes a circuit is formed, a first circuit component used for a board which meets specifications for a first voltage or a second circuit component used for a board which meets specifications for a second voltage higher than the first voltage, is mounted, and spacing between adjacent printed wires is equal to or larger than a distance which secures an insulation distance when the second voltage is input.
    Type: Application
    Filed: December 28, 2015
    Publication date: October 18, 2018
    Inventors: Kenji IWAZAKI, Yosuke SHINOMOTO, Kazunori HATAKEYAMA
  • Publication number: 20180245831
    Abstract: The invention includes an inverter to convert a direct-current voltage from a direct-current power supply into an alternating-current voltage and apply the alternating-current voltage to a motor that rotationally drives a load, a direct-current-voltage detecting unit to detect a voltage in the direct-current power supply, a shunt resistance that is a current detecting unit to detect an electric current flowing to the inverter, and an inverter control unit to generate PWM signals for driving switching elements of the inverter on the basis of the voltage detected by the direct-current-voltage detecting unit and the electric current detected by the shunt resistance, to set a specific phase difference between a phase of a carrier signal used for generation of the PWM signals and a phase of the alternating-current voltage, and to control the inverter such that a frequency of the PWM signals are synchronized with a frequency of the alternating-current voltage, the frequency of the PWM signals being an integer multi
    Type: Application
    Filed: August 28, 2015
    Publication date: August 30, 2018
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Yosuke SHINOMOTO, Koichi ARISAWA
  • Publication number: 20180241336
    Abstract: A power converting apparatus includes: an inverter converting a direct-current voltage supplied from a power supply unit into an alternating-current voltage and outputting the alternating-current voltage to a motor; and an inverter control unit outputting synchronous PWM (Pulse Width Modulation) signals for driving switching elements of the inverter. A frequency of the synchronous PWM signals is periodically varied when periodic pulsation occurs in a load connected to the motor.
    Type: Application
    Filed: September 4, 2015
    Publication date: August 23, 2018
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Yosuke SHINOMOTO, Takahiko KOBAYASHI, Yasuhiko WADA
  • Patent number: 10056826
    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: Grant
    Filed: June 5, 2014
    Date of Patent: August 21, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Keisuke Uemura, Yosuke Shinomoto
  • Publication number: 20180226913
    Abstract: A power converting apparatus for applying to a load an alternating-current voltage converted from a direct-current voltage includes an inverter that receives a PWM signal and applies the alternating-current voltage to the load and an inverter control unit that generates the PWM signal and supplies the PWM signal to the inverter. The frequency of the PWM signal is integer multiples of the frequency of the alternating-current voltage. The alternating-current voltage includes a plurality of positive pulses and a plurality of negative pulses in one cycle of the alternating-current voltage. The number of the positive pulses and the number of the negative pulses are equal.
    Type: Application
    Filed: September 4, 2015
    Publication date: August 9, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazunori HATAKEYAMA, Keisuke UEMURA, Takahiko KOBAYASHI, Yasuhiko WADA
  • Publication number: 20180219508
    Abstract: A motor driving device that drives a motor with an alternating-current power converted from a direct-current power supply, includes an inverter that receives a pulse-width modulation signal and supplies the alternating-current power to the motor, and an inverter control unit that generates the pulse-width modulation signal and supplies the pulse-width modulation signal to the inverter. The inverter control unit reduces the number of pulses of the pulse-width modulation signal generated during a first period within one period of a mechanical angle of the motor to be lower than the number of pulses of the pulse-width modulation signal generated during a second period within the one period of the mechanical angle of the motor. The first period is a period during which a load torque is lower than a load torque during the second period.
    Type: Application
    Filed: August 12, 2015
    Publication date: August 2, 2018
    Inventors: Koichi ARISAWA, Kazunori HATAKEYAMA, Keisuke UEMURA
  • Patent number: 10033325
    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: Grant
    Filed: September 26, 2014
    Date of Patent: July 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kazunori Hatakeyama
  • Publication number: 20180198390
    Abstract: An electric motor includes a stator, a rotor provided to be rotatable with respect to the stator, and a driving circuit board including a power IC applying a driving voltage to the stator, a Hall IC detecting a rotation position of the rotor, and a control IC adjusting a phase of the driving voltage in accordance with a magnetic-pole-position signal from the Hall IC and rotation speed information calculated on the basis of the magnetic-pole-position signal. The Hall IC is provided at a position at which an advance angle is larger than zero when a rotation speed of the rotor is zero.
    Type: Application
    Filed: October 30, 2015
    Publication date: July 12, 2018
    Inventors: Junichiro OYA, Tomoaki OIKAWA, Mineo YAMAMOTO, Hiroyuki ISHII, Hiroki ASO, Yuto URABE, Kazunori HATAKEYAMA, Takuya SHIMOMUGI
  • Patent number: 9960703
    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: Grant
    Filed: September 6, 2013
    Date of Patent: May 1, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Shota Kamiya, Yosuke Shinomoto
  • Patent number: 9948203
    Abstract: A direct-current power supply device includes a reactor, one end of which is connected to one output end of an alternating-current power supply, a switching unit for short-circuiting the other end of the reactor and the other output end of the alternating-current power supply, a rectifying unit configured to rectify an alternating-current voltage supplied from the alternating-current power supply and generate a voltage equal to or higher than a double voltage, a smoothing capacitor connected to the rectifying unit via backflow preventing diodes and configured to smooth a direct-current voltage output from the rectifying unit, and a control unit configured to control the switching unit and stop the supply of the alternating-current voltage to the rectifying unit in a predetermined period after a predetermined time has elapsed from a zero cross point of the alternating-current voltage output from the alternating-current power supply.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: April 17, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yosuke Shinomoto, Koichi Arisawa, Kazunori Hatakeyama, Takashi Yamakawa
  • Patent number: 9929636
    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: Grant
    Filed: February 19, 2014
    Date of Patent: March 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Shinomoto, Kazunori Hatakeyama, Shota Kamiya, Keisuke Uemura
  • Patent number: 9903629
    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: Grant
    Filed: June 20, 2012
    Date of Patent: February 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Patent number: 9829226
    Abstract: An object of the present invention is to maintain a heating amount constant when a compressor is heated at the time of shutdown of the compressor, regardless of the influences of production tolerance and environment variations. An inverter control unit causes an inverter to generate a high-frequency AC voltage having a de-energized section in which a voltage applied from the inverter to a motor is zero between a section in which the voltage is positive and a section in which the voltage is negative. At this time, the inverter control unit detects a value of a current flowing to the inverter in a detection section residing from immediately before a start of the de-energized section to immediately after an end of the de-energized section, and causes the inverter to generate a high-frequency AC voltage adjusted according to the detected current value.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: November 28, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Takuya Shimomugi, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino