Title:
POWER CONVERSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/153048
Kind Code:
A1
Abstract:
This power conversion device comprises: a power conversion unit that converts a DC voltage to an AC voltage applicable to a device to be operated; a current detection unit that detects the output current output from the power conversion unit; a storage unit that stores the reference value of the output current detected by the current detection unit or the reference value of a value to be monitored from the device to be operated and the upper and lower limit values determined from the reference value; and a control unit that controls the power conversion unit. The control unit calculates the frequency of the state of exceeding the upper limit value or the frequency of the state of less than the lower limit value and determines whether there is an abnormality or not by comparing the frequency with a predetermined frequency.
Inventors:
ARAO YUSUKE (JP)
Application Number:
PCT/JP2022/043682
Publication Date:
August 17, 2023
Filing Date:
November 28, 2022
Export Citation:
Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
H02M7/48
Domestic Patent References:
| WO2019230191A1 | 2019-12-05 |
Foreign References:
| JP2020137145A | 2020-08-31 | |||
| JP6380628B1 | 2018-08-29 | |||
| JP2021114895A | 2021-08-05 |
Attorney, Agent or Firm:
SEIRYO I.P.C. (JP)
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