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公开(公告)号：US10090760B2
公开(公告)日：2018-10-02
申请号：US15431913
申请日：2017-02-14
Applicant: Mitsubishi Electric Corporation
Inventor： Masaru Kobayashi , Matahiko Ikeda , Nobuhiro Kihara , Kazuhiko Otsuka , Junichi Abe
Abstract: In a DC-DC voltage conversion device, overheat of a diode element connected in anti-parallel with a semiconductor switching element is a problem, and in order to resolve this, a temperature of a semiconductor switching element of a main conversion circuit is detected, a temperature of a diode element connected in parallel with the semiconductor switching element is calculated using a correction calculation of the detected semiconductor switching element temperature value in accordance with a step-up ratio of the DC-DC voltage conversion device, and diode element overheat protection is carried out in accordance with the calculated temperature value.
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公开(公告)号：US11848633B2
公开(公告)日：2023-12-19
申请号：US17271280
申请日：2018-11-20
Applicant: Mitsubishi Electric Corporation
Inventor： Shingo Harada , Keiichi Enoki , Nozomu Kamioka , Tomohisa Shoda , Yoshimasa Nishijima , Kazuhiko Otsuka
CPC classification number: H02P27/085 , H02P21/0021 , H02P21/22
Abstract: To provide a controller for AC rotary electric machine which can compensate error of the actual on-duty with respect to the command on-duty calculated from command voltage with good accuracy, with a simple circuit configuration. A controller for AC rotary electric machine detects an actual on-duty of the switching device based on the detection value of the midpoint potential which is the potential of the connection node of the series connection in the series circuit; calculates an on-duty error based on the difference between the command on-duty and the actual on-duty; and corrects the voltage command or the command on-duty based on the on-duty error.
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公开(公告)号：US09625292B2
公开(公告)日：2017-04-18
申请号：US14598550
申请日：2015-01-16
Applicant: Mitsubishi Electric Corporation
Inventor： Shinichiro Hidaka , Yuji Ariyoshi , Masahiro Kawai , Kazuhiko Otsuka , Naoyuki Kishikawa , Naoki Morinaga
CPC classification number: G01F1/34 , F02M35/10386 , G01F1/684 , G01F1/696
Abstract: An environment sensor is mounted on a second surface of a circuit board that does not have a wire bonding pad, and is arranged in a measuring chamber that is disposed in a circuit board receiving portion. The measuring chamber has a communication port for communication with a main passage. According to this configuration, process addition attributable to integration between a flow rate measurement device and the environment sensor is not required. The environment sensor does not affect air flow in a bypass passage, and thus detection accuracy of a flow rate detection element that is arranged in the bypass passage does not decline.
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公开(公告)号：US11183964B2
公开(公告)日：2021-11-23
申请号：US16794488
申请日：2020-02-19
Applicant: Mitsubishi Electric Corporation
Inventor： Shingo Harada , Keiichi Enoki , Tomohisa Shoda , Nozomu Kamioka , Ryosuke Shigematsu , Kazuhiko Otsuka
Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.
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公开(公告)号：US10693390B2
公开(公告)日：2020-06-23
申请号：US16196049
申请日：2018-11-20
Applicant: Mitsubishi Electric Corporation , Honda Motor Co., Ltd.
Inventor： Kazuki Takegawa , Satoshi Ishibashi , Kazuhiko Otsuka , Masaya Takahashi
IPC: H02M1/32 , H02P1/04 , H02P3/18 , H02P29/68 , G01P5/10 , H02M7/48 , H02P25/24 , H02P25/04 , G01K1/08 , H02P27/06 , H02M7/5387 , H02M3/158 , H02P3/16 , H02P6/14 , G01K17/00
Abstract: In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.
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Patent Agency Ranking
公开(公告)号：US08899103B2
公开(公告)日：2014-12-02
申请号：US13927955
申请日：2013-06-26
Applicant: Mitsubishi Electric Corporation
Inventor： Yuji Ariyoshi , Masahiro Kawai , Koji Tanimoto , Kazuhiko Otsuka
CPC classification number: G01F1/69 , G01F1/6845 , G01F1/692 , G01F1/696 , G01F1/699 , G01F1/72 , G01F5/00
Abstract: A thermal air flow meter comprises: a bridge circuit unit that incorporates a bridge circuit including a heating resistor and supplies a current to the heating resistor so that the temperature of the resistor is always set higher by a predetermined temperature than the temperature of intake air detected by an intake-air temperature detection resistor, and outputs an output signal Vm based on the current value supplied to the heating resistor, in accordance with a flow rate of the intake air; a differential amplifier unit that amplifies a voltage dependent on difference in temperature between an upstream heating resistor and downstream heating resistor; and a subtraction processor that subtracts from the output signal Vm a constant times an output voltage Vd1 from the differential amplifier unit, and outputs a correction output signal Vout.
Abstract translation: 热空气流量计包括：桥接电路单元，其包括包括加热电阻器的桥接电路并且向加热电阻器提供电流，使得电阻器的温度总是设置为比检测到的进气温度高预定温度 通过进气温度检测电阻器，根据进气的流量，输出基于供给到加热电阻器的电流值的输出信号Vm; 差分放大器单元，其根据上游加热电阻器和下游发热电阻器之间的温度差放大电压; 以及减法处理器，其从输出信号Vm a减去常数乘以来自差分放大器单元的输出电压Vd1，并输出校正输出信号Vout。
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公开(公告)号：US11050376B2
公开(公告)日：2021-06-29
申请号：US16609489
申请日：2017-06-06
Applicant: Mitsubishi Electric Corporation
Inventor： Yoshimasa Nishijima , Keiichi Enoki , Masutaka Watanabe , Yasukazu Murata , Shingo Harada , Kazuhiko Otsuka
Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.
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公开(公告)号：US11323061B2
公开(公告)日：2022-05-03
申请号：US17264900
申请日：2018-09-25
Applicant: Mitsubishi Electric Corporation
Inventor： Shingo Harada , Keiichi Enoki , Nozomu Kamioka , Tomohisa Shoda , Yoshimasa Nishijima , Kazuhiko Otsuka
Abstract: A control device for an AC rotating electric machine includes: a temperature detection unit configured to detect a temperature of a protection part; a maximum current adjustment unit configured to adjust a maximum current of an AC rotating electric machine so as to prevent the temperature of the protection part from exceeding a set temperature; an allowable torque calculation unit configured to calculate an allowable torque based on the maximum current adjusted; a torque command adjustment unit configured to adjust a torque command value directed to the AC rotating electric machine based on the allowable torque; an upper limit number-of-rotation calculation unit configured to calculate an upper-limit number of rotations of the AC rotating electric machine based on the maximum current adjusted; and a number-of-rotation adjustment unit configured to adjust the number of rotations of the AC rotating electric machine based on the upper-limit number of rotations.
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公开(公告)号：US10850619B2
公开(公告)日：2020-12-01
申请号：US16177934
申请日：2018-11-01
Applicant: Mitsubishi Electric Corporation , Honda Motor Co., Ltd.
Inventor： Kazuki Takegawa , Satoshi Ishibashi , Kazuhiko Otsuka , Masaya Takahashi , Naotaka Tsuji
Abstract: A power conversion device includes a backup power source as a power source for a discharge controller that discharges electric charges of a capacitor, and an abnormal state in the backup power source or loads is not capable of being dealt with when power is supplied to loads from the backup power source, which makes an output voltage of the backup power source be in an abnormal state. In order to solve the problem, when an abnormality occurs in the backup power source or in loads and the abnormality is detected in power supply from the backup power source, a place where the abnormality occurs is specified. When the specified place where the abnormality occurs is a load, power supply to the load is stopped, thereby preventing the output voltage of the backup power source from being abnormal even when an abnormality occurs in part of power supply destinations.
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公开(公告)号：US10173530B2
公开(公告)日：2019-01-08
申请号：US15728691
申请日：2017-10-10
Applicant: Mitsubishi Electric Corporation
Inventor： Kazuki Takegawa , Koji Nakajima , Satoshi Ishibashi , Kazuhiko Otsuka
Abstract: When a motor rotation speed is equal to or greater than a predetermined rotation speed when an automobile collision is detected or when power stops, a motor rotation speed reduction control is carried out by an inverter control unit, and when an inter-terminal voltage of a secondary smoothing capacitor drops below a predetermined voltage during the motor rotation speed reduction control, the motor rotation speed reduction control is stopped, whereby induction voltage caused by motor rotation is applied to the secondary smoothing capacitor, the inter-terminal voltage of the secondary smoothing capacitor is raised, and the motor rotation speed reduction control is carried out while keeping the inter-terminal voltage of the secondary smoothing capacitor within an operating voltage range of the inverter control unit.
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