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1.发明申请公开(公告)号：US20240413765A1
公开(公告)日：2024-12-12
申请号：US18704161
申请日：2021-12-10
Applicant: Mitsubishi Electric Corporation
Inventor： Shinya TOYODOME , Kazunori HATAKEYAMA , Shoei TSUTSUMI
IPC: H02M7/483
Abstract: A power conversion apparatus includes: a converter that rectifies a power-supply voltage applied from an AC power supply; a capacitor connected to an output end of the converter; an inverter connected across the capacitor; and a control device that performs vibration reduction control of reducing vibration of a compressor by controlling an operation of the inverter. The control device includes: a γ-axis current compensation unit that reduces pulsation of a capacitor output current output from the capacitor to the inverter; and a γ-axis current compensation limiting unit that limits an excitation current compensation value generated by the γ-axis current compensation unit so as to reduce a harmonic component included in a power-supply current flowing between the AC power supply and the converter.
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2.发明申请公开(公告)号：US20240396486A1
公开(公告)日：2024-11-28
申请号：US18695130
申请日：2021-11-26
Applicant: Mitsubishi Electric Corporation
Inventor： Shinya TOYODOME , Kazunori HATAKEYAMA , Shoei TSUTSUMI
Abstract: A power conversion apparatus includes a converter that rectifies a power-supply voltage applied from an AC power supply, a capacitor connected to an output end of the converter, an inverter connected across the capacitor, and a control device that controls an operation of the inverter. The control device performs a first control of reducing a pulsatile component of a capacitor output current output from the capacitor to the inverter when the load is driven. The first control is control of causing the motor to generate a loss, and the loss that the motor is caused to generate is performed by using a y-axis current.
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公开(公告)号：US20240128913A1
公开(公告)日：2024-04-18
申请号：US18264984
申请日：2021-03-29
Applicant: Mitsubishi Electric Corporation
Inventor： Kazunori HATAKEYAMA
Abstract: In a power converter, a controller controls the operation of a converter, and a control voltage generator generates a control voltage for operating the controller. When the voltage value of the direct-current voltage output from the power converter is higher than the voltage value of the control voltage and a detection signal is not output from a voltage detector that detects the power supply voltage, the operation of switching elements of the converter is stopped under the control of the controller.
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4.发明公开公开(公告)号：US20240097576A1
公开(公告)日：2024-03-21
申请号：US18256799
申请日：2021-02-17
Applicant: Mitsubishi Electric Corporation
Inventor： Yuichi SHIMIZU , Kazunori HATAKEYAMA
Abstract: A DC power supply device includes a rectification circuit, a reactor, a first capacitor and a second capacitor, a first switching element to set the first capacitor in a charging state when the first switching element is in an off state and to set the first capacitor in a non-charging state when the first switching element is in an on state, a second switching element to set the second capacitor in the charging state when the second switching element is in the off state and to set the second capacitor in the non-charging state when the second switching element is in the on state, and a controller. The controller has a full-wave rectification mode as an operation mode in which one of the first and second switching elements is maintained in the off state and the other one of the first and second switching elements undergoes PWM control.
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5.发明申请公开(公告)号：US20220345050A1
公开(公告)日：2022-10-27
申请号：US17641137
申请日：2019-11-14
Applicant: Mitsubishi Electric Corporation
Inventor： Motoya SUZUKI , Satoru ICHIKI , Keisuke UEMURA , Koichi ARISAWA , Kazunori HATAKEYAMA
Abstract: A power conversion apparatus includes a converter circuit converting AC voltage output from an AC power supply into DC voltage. The converter circuit includes unit converters. The power conversion apparatus includes a low current-oriented controller the unit converters to cause current corresponding to a single phase to flow through a current detector, and a high current-oriented controller controlling operation of the unit converters based on a result of comparison between a duty command and a carrier signal, where the duty command is generated based on detection values detected by the current detector and a voltage detector. When the detection value detected by the current detector is less than or equal to a first threshold, the low current-oriented controller is activated, and when the detection value detected by the current detector is greater than the first threshold, the high current-oriented controller is activated.
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Patent Agency Ranking
公开(公告)号：US20220131492A1
公开(公告)日：2022-04-28
申请号：US17431335
申请日：2019-04-11
Applicant: Mitsubishi Electric Corporation
Inventor： Yuji TAKAYAMA , Haruka MATSUO , Kazunori HATAKEYAMA
Abstract: A motor driving apparatus for driving a single-phase motor includes an inverter disposed between a battery and the single-phase motor, the inverter applying a first voltage to the single-phase motor at startup and applying a second voltage to the single-phase motor during a normal operation. A stop time period is present after application of the first voltage, application of the first voltage being stopped during the stop time period, and the inverter applies the second voltage after a lapse of the stop time period.
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公开(公告)号：US20220115973A1
公开(公告)日：2022-04-14
申请号：US17428683
申请日：2019-02-21
Applicant: Mitsubishi Electric Corporation
Inventor： Shinya TOYODOME , Kazunori HATAKEYAMA , Kenji TAKAHASHI
Abstract: An inverter for driving a motor that has a switchable connection of windings and drives a load element having a periodically varying load torque is provided. The inverter is controlled so that an output torque of the motor follows the periodic variation of the load torque. The inverter is controlled so that a current flowing through the motor is zero during a period including a minimum torque phase at which the load torque is at or near a minimum value. The connection is switched while the current flowing through the motor is zero. It is possible to switch the connection of the windings while the motor is rotating, and avoid an increase in apparatus size.
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公开(公告)号：US20220077806A1
公开(公告)日：2022-03-10
申请号：US17424566
申请日：2020-02-27
Applicant: Mitsubishi Electric Corporation
Inventor： Yuichi SHIMIZU , Kazunori HATAKEYAMA
Abstract: A motor drive device that drives motors with one inverter includes a step-out control unit that detects step-out in which the operating frequency of at least one of the motors does not match the inverter output frequency, or the operating frequency of at least one of the motors does not match the operating frequency of another one of the motors, and stops the motors by switching an energization state of the inverter when at least one of the motors is out of step.
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公开(公告)号：US20210006183A1
公开(公告)日：2021-01-07
申请号：US16976583
申请日：2018-04-02
Applicant: Mitsubishi Electric Corporation
Inventor： Yuichi SHIMIZU , Kazunori HATAKEYAMA , Keisuke UEMURA
Abstract: Prior to starting of first and second synchronous motors, direct-current excitation is performed to pull in rotors of the synchronous motors to a designated position. In the direct-current excitation, a difference between a value of a direct current flowing through the first synchronous motor and a value of a direct current flowing through the second synchronous motor is reduced. For example, d-axis currents and q-axis currents corresponding to three-phase currents flowing through the motors are determined; a d-axis voltage command value for making one of the d-axis currents larger in absolute value equal to a d-axis current command value is determined, and a q-axis voltage command value for making one of the q-axis currents larger in absolute value equal to a q-axis current command value is determined; an inverter is driven using the determined d-axis voltage command value and q-axis voltage command value.
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公开(公告)号：US20170272006A1
公开(公告)日：2017-09-21
申请号：US15505370
申请日：2014-09-05
Applicant: Mitsubishi Electric Corporation
Inventor： Keisuke UEMURA , Kazunori HATAKEYAMA , Yosuke SHINOMOTO , Mitsuo KASHIMA , Takashi MATSUMOTO
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.
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