POWER CONVERSION DEVICE - HITACHI AUTOMOTIVE SYSTEMS LTD

Title:

POWER CONVERSION DEVICE

Document Type and Number:

WIPO Patent Application WO/2018/225375

Kind Code:

A1

Abstract:

The purpose of the present invention is to implement a power conversion device capable of suppressing the reverse flow of current and improving current responsiveness and power conversion efficiency. A snubber capacitor 25 capable of absorbing switching surge is connected to a low voltage-side switching circuit having switching elements 250, 260, 270, and 280. It is determined that the snubber capacitor 25 is not fully charged or has not approached a fully charged state until a predetermined time elapses since the start of switching was requested to a control device 310, and control is made such that the low voltage-side switching circuit and a high voltage-side switching circuit that has switching elements 210, 220, 230, and 240 are asynchronous. After the predetermined time has elapsed, control is made such that the low voltage-side switching circuit and the high voltage-side switching circuit are synchronous, and duty ratios of the low voltage-side switching circuit and the high voltage-side switching circuit are controlled such that current does not flow reversely from the low voltage-side switching circuit to the high voltage-side switching circuit.

Inventors:

YAEGAKI SHO (JP)
KUBO KENJI (JP)
ONO TAKUMA (JP)
YAMABE YUKI (JP)

Application Number:

PCT/JP2018/015174

Publication Date:

December 13, 2018

Filing Date:

April 11, 2018

Export Citation:

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Assignee:

HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

International Classes:

H02M3/28; H02M7/21

Domestic Patent References:

WO2015004825A1

2015-01-15

Foreign References:

JP2017042001A	2017-02-23
JP2013106407A	2013-05-30
JP2004215356A	2004-07-29

Other References: