公开(公告)号：US09742301B2

公开(公告)日：2017-08-22

申请号：US14245379

申请日：2014-04-04

Applicant: DENSO CORPORATION

Inventor： Masashi Hamamoto ,  Kimikazu Nakamura ,  Kenta Hatakenaka

IPC: H02H7/122 ,  H02M3/337

CPC classification number: H02M3/3376

Abstract: An electric power conversion device has a transformer, a DC-AC conversion circuit, an AC-DC conversion circuit and a control circuit. The control circuit calculates an input current instruction value (Iref) based on a difference value (ΔV) between an output voltage (Vout) of the AC-DC conversion circuit and an output voltage instruction value (Vref). A comparator compares an input current (Iin) of the DC-AC conversion circuit with the value (Iref). The DC-AC conversion circuit is controlled by the comparison result of the comparator. The control circuit correctly determines an occurrence of an abnormality state of the electric power conversion device based on the operation state of the comparator, the difference value (ΔV) between the output voltage (Vout) of the AC-DC conversion circuit and the output voltage instruction value (Vref), and the input voltage (Vin) of the DC-AC conversion circuit without using any output current of the AC-DC conversion circuit.