Title:
ELECTRIC POWER CONVERSION DEVICE AND DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/057708
Kind Code:
A1
Abstract:
The present invention provides an electric power conversion device that converts DC power to three-phase AC power for output, the electric power conversion device comprising: an AC current sensor that detects current values in two phases of a three-phase AC current of the three-phase AC power; a target current calculation unit that calculates target currents on the basis of a target torque; a voltage command calculation unit that calculates voltage command values on the basis of the target currents and the detection values of the AC current sensor; and an AC current sensor diagnosis unit that determines an abnormality of the AC current sensor on the basis of the detection values of the AC current sensor. The AC current sensor diagnosis unit includes: a first diagnosis unit that determines the abnormality on the basis of two-phase voltage command values obtained by converting the voltage command values to values in a Cartesian coordinate system in two phases having one of the output phases as a reference; and a second diagnosis unit that determines the abnormality on the basis of two-phase current detection values obtained by converting the detection values of the AC current sensor to values in the Cartesian coordinate system in the two phases. The AC current sensor diagnosis unit switches between a determination of the abnormality by the first diagnosis unit and a determination of the abnormality by the second diagnosis unit according to an operating condition of the electric power conversion device.
Inventors:
INADA RYOICHI (JP)
NAKANO HIROSHI (JP)
KANEKAWA NOBUYASU (JP)
SHIGETA SATORU (JP)
SUGURE YASUO (JP)
NAKANO HIROSHI (JP)
KANEKAWA NOBUYASU (JP)
SHIGETA SATORU (JP)
SUGURE YASUO (JP)
Application Number:
PCT/JP2023/026473
Publication Date:
March 21, 2024
Filing Date:
July 19, 2023
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
H02M7/48; H02P27/06
Domestic Patent References:
| WO2019111293A1 | 2019-06-13 |
Foreign References:
| JP2021061746A | 2021-04-15 | |||
| JP2002034266A | 2002-01-31 | |||
| JPH09172791A | 1997-06-30 | |||
| JPH09172703A | 1997-06-30 |
Attorney, Agent or Firm:
SUNNEXT INTERNATIONAL PATENT OFFICE (JP)
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