公开(公告)号：US12149183B2

公开(公告)日：2024-11-19

申请号：US17788659

申请日：2020-12-08

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi Hara ,  Toshiyuki Ajima ,  Akihiro Ashida ,  Kiyoshi Kuroda ,  Yoshinori Aoshima

IPC: H02P21/00 ,  B60L53/22 ,  H02M1/00 ,  H02M7/5387 ,  H02P21/22 ,  H02P27/08

Abstract: A deviation between a detection result of an output current of an inverter and an actual current is suppressed. A current detection unit 7 detects a three-phase AC current output from an inverter 3 or input to the inverter 3. An inverter control device 1 controls the inverter 3 based on a current detection value based on a detection result of the three-phase AC current by the current detection unit 7 and a predetermined current command value. The inverter control device 1 corrects the current detection value so as to correct a detection error of the three-phase AC current generated due to a delay time of a filter 72 which is a filter element provided in the current detection unit 7.

公开(公告)号：US12170497B2

公开(公告)日：2024-12-17

申请号：US17917395

申请日：2021-01-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Toshiyuki Ajima ,  Takafumi Hara ,  Akihiro Ashida ,  Hirokazu Matsui ,  Kiyoshi Kuroda

IPC: H02P27/08 ,  B60L50/51 ,  B60L53/20 ,  H02M7/5395

Abstract: An inverter control device 200 includes a PWM control unit 220 that generates a PWM pulse for controlling an inverter 100, and a pulse edge control unit 250 that performs pulse edge control for correcting (shifting) a phase of a pulse edge of the PWM pulse generated by the PWM control unit 220. The PWM control unit 220 generates a PWM pulse by using a modulation rate based on a voltage command (Vd*, Vq*). The pulse edge control unit 250 corrects the PWM pulse so that a phase difference between a zero cross point where the modulation wave changes across 0 and a pulse edge of the PWM pulse falls within a predetermined range.

公开(公告)号：US11646690B2

公开(公告)日：2023-05-09

申请号：US17282453

申请日：2019-09-12

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi Hara ,  Midori Takaoka ,  Toshiyuki Ajima ,  Hirokazu Matsui ,  Akihiro Ashida

IPC: H02P1/30 ,  H02P27/08 ,  B60L15/20 ,  B60K6/485

CPC classification number: H02P27/085 ,  B60L15/20 ,  B60K6/485 ,  B60Y2200/91 ,  B60Y2200/92

Abstract: A random value integration unit 175 outputs a random value output from a random value generation unit 174 in a diffusion width Rand output from a diffusion width generation unit 173 by a product of an output of the random value generation unit 174 and an output of the diffusion width generation unit 173. A triangular wave signal generation unit 176 generates a triangular wave signal corresponding to a second carrier frequency fc2 which is obtained by adding the random value output from the random value integration unit 175 to a first carrier frequency fc1 which is an output of a carrier frequency setting unit 171. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fc1 is used as the second carrier frequency fc2, and the second carrier frequency is used as the carrier frequency.

公开(公告)号：US11984821B2

公开(公告)日：2024-05-14

申请号：US17761444

申请日：2020-07-31

Applicant: Hitachi Astemo, Ltd.

Inventor： Toshiyuki Ajima ,  Takafumi Hara ,  Akihiro Ashida ,  Hirokazu Matsui

IPC: H02M7/53 ,  B60L15/08 ,  H02M1/12 ,  H02M7/5395 ,  H02P27/08 ,  H02P29/40

CPC classification number: H02M7/5395 ,  B60L15/08 ,  H02M1/12 ,  H02P27/08 ,  H02P29/40 ,  B60L2210/40

Abstract: An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

公开(公告)号：US11558000B2

公开(公告)日：2023-01-17

申请号：US16965147

申请日：2019-01-24

Applicant: Hitachi Astemo, Ltd.

Inventor： Takafumi Hara ,  Toshiyuki Ajima ,  Akihiro Ashida

IPC: H02P27/08 ,  H02M1/44 ,  H02P23/28 ,  H02M7/5395

Abstract: An object of the present invention is to provide a motor control device that can suppress electromagnetic noises including a switching noise and to an electric vehicle system using the motor control device. A motor control device includes: a power converter that is controlled by a pulse width modulation signal; a motor that is driven by the power converter; and a controller that generates the pulse width modulation signal, based on a carrier signal. When switching between a first carrier frequency (fc1) of the carrier signal and a second carrier frequency (fc2) of the carrier signal, the controller varies proportions of the first carrier frequency and the second carrier frequency in accordance with a number of rotations of the motor, the second carrier frequency being higher than the first carrier frequency.