Title:
INVERTER CONTROL DEVICE AND CALCULATION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/276265
Kind Code:
A1
Abstract:
This inverter control device is provided to an inverter that supplies a motor with power converted from DC to three-phase AC by using a switching circuit. The inverter comprises an ammeter that acquires current of each phase of the three-phase AC as a current detection value. The motor comprises an angle sensor that measures the rotational angle of the motor. A DC current estimation unit is provided, which estimates an average value of DC current values during one cycle of a PWM signal, which is for controlling the switching circuit, on the basis of a duty value of the PWM signal, an average value of current detection values acquired in each one cycle of the PWM signal, and a correction coefficient. The DC current estimation unit is provided with a coefficient calculation unit that calculates the correction coefficient on the basis of the cycle, the rotational angle, and the duty value of the PWM signal.
Inventors:
YAMABE YUKI (JP)
MYOEN KOHEI (JP)
MYOEN KOHEI (JP)
Application Number:
PCT/JP2022/007760
Publication Date:
January 05, 2023
Filing Date:
February 24, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
H02P27/08; H02M7/48
Domestic Patent References:
| WO2019008676A1 | 2019-01-10 | |||
| WO2021036794A1 | 2021-03-04 |
Foreign References:
| JP2007252094A | 2007-09-27 | |||
| JP2017208893A | 2017-11-24 |
Attorney, Agent or Firm:
SUNNEXT INTERNATIONAL PATENT OFFICE (JP)
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