Title:
ELECTRIC POWER CONVERSION DEVICE, AND ELECTRIC POWER CONVERSION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/053565
Kind Code:
A1
Abstract:
Provided is an electric power conversion device comprising a plurality of switching elements connected in parallel, the electric power conversion device suppressing a temperature imbalance caused by delay time variations and a temperature imbalance caused by on-voltage variations. The electric power conversion device comprising a plurality of switching elements is characterized by further comprising: a temperature sensor that detects the temperature of the plurality of switching elements; a carrier frequency adjustment unit that adjusts a carrier frequency of the plurality of switching elements; a delay time adjustment unit that adjusts a turn-on time or a turn-off time of the plurality of switching elements; and a gate voltage adjustment unit that adjusts an on-voltage of the plurality of switching elements. The electric power conversion device is also characterized in that: the temperature sensor detects an amount of change in a temperature difference of the plurality of switching elements before and after a carrier frequency adjustment performed by the carrier frequency adjustment unit; and the delay time adjustment unit adjusts the turn-on time or the turn-off time of the plurality of switching elements on the basis of the detected amount of change in the temperature difference.
Inventors:
ENDO SHUN (JP)
SHIMADA TAKAE (JP)
ANDO MASATO (JP)
HIRUTA KIYOHARU (JP)
TAKAYAMA NAOKI (JP)
SEKI MASAKI (JP)
SHIMADA TAKAE (JP)
ANDO MASATO (JP)
HIRUTA KIYOHARU (JP)
TAKAYAMA NAOKI (JP)
SEKI MASAKI (JP)
Application Number:
PCT/JP2022/020933
Publication Date:
April 06, 2023
Filing Date:
May 20, 2022
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02M7/48; H02M7/493
Foreign References:
| JP2020088975A | 2020-06-04 | |||
| JP2019068592A | 2019-04-25 | |||
| US20110316514A1 | 2011-12-29 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
Download PDF: