POWER CONVERSION DEVICE - MITSUBISHI ELECTRIC CORP

Title:

POWER CONVERSION DEVICE

Document Type and Number:

WIPO Patent Application WO/2013/080383

Kind Code:

A1

Abstract:

The purpose of the invention is to obtain a three-level inverter type power conversion device capable of ensuring long-term reliability by reducing the withstanding voltage of an insulating transformer for a semiconductor driving circuit in a circumstance in which a power supply voltage to be converted is high. The reference voltage levels of respective semiconductor driving circuits and the reference voltage levels of the primary sides of respective insulating transformers and the secondary sides of an inverter transformer are both supplied from the same connection points as the connection points of four main circuit capacitors, the insulating transformers being used for supplying DC powers isolated from each other to the corresponding semiconductor driving circuits. Accordingly, the voltage level difference of the reference voltage levels between the primary and secondary sides of each of the plurality of insulating transformers is equal to 0 V even when a power supply voltage to be converted is as high as, for example, DC 1000V. Therefore, even in a circumstance in which the power supply voltage to be converted is as high as, for example, DC 1000V, since a corona discharge does not occur between the primary and secondary sides of the insulating transformer, insulation degradation does not occur and the long-term reliability of the insulating transformer is improved.

Inventors:

YAMAMOTO KAZUYA (JP)
KAGEYAMA MASANORI (JP)
MURATA SHINJI (JP)
ITO HIROSHI (JP)

Application Number:

PCT/JP2011/077970

Publication Date:

June 06, 2013

Filing Date:

December 02, 2011

Export Citation:

Click for automatic bibliography generation Help

Assignee:

MITSUBISHI ELECTRIC CORP (JP)
YAMAMOTO KAZUYA (JP)
KAGEYAMA MASANORI (JP)
MURATA SHINJI (JP)
ITO HIROSHI (JP)

International Classes:

H02M7/48

Foreign References:

JPH0767353A	1995-03-10
JP2011142783A	2011-07-21
JPS5147848B1	1976-12-17
JP2003324972A	2003-11-14

Other References: