公开(公告)号：US20240413750A1

公开(公告)日：2024-12-12

申请号：US18565129

申请日：2021-05-31

Applicant: Hitachi Astemo, Ltd.

Inventor： Yuji MIYATA ,  Yuta NAKAMURA ,  Masatoshi GOTO ,  Kazunari KUROKAWA ,  Yoshinori SAGIYA ,  Takuma KATO ,  Kazuya NAGASAWA

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/32

Abstract: The purpose of the present invention is to provide a power conversion device capable of further decreasing, compared to the prior art, misdetection of failures in a chopper circuit which constitutes phases. In order to achieve the foregoing, the present invention comprises: a multi-phase transformer circuit in which a plurality of chopper circuits are connected in parallel according to the number of phases; a drift detection unit which detects drift in a phase current in each chopper circuit; and a failure detection unit which variably sets a failure threshold value according to a state quantity of the chopper circuit, and which detects a failure in the chopper circuit by comparing the drift with the failure threshold value.