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Title:
POWER CONVERSION DEVICE
Document Type and Number:
Japanese Patent JP2013211950
Kind Code:
A
Abstract:

To inexpensively and accurately detect on-operation malfunction (opening of a relay contact) of n relays.

A power conversion device comprises: a forward converter for rectifying AC voltage of an AC power supply to convert to DC voltage; a DC intermediate circuit having a smoothing capacitor for smoothing the DC voltage of the forward converter; a current-limiting circuit for suppressing charge current to the smoothing capacitor in the DC intermediate circuit; a voltage detection circuit for detecting voltage of the DC intermediate circuit; an inverse converter for converting the DC voltage of the forward converter to AC voltage; n temperature detection elements which are arranged on a circuit board connected to a terminal corresponding to contact parts of n relays connected in parallel to a resistance of the current-limiting circuit, and detect temperature of each of the n relays; and a control unit for detecting that any of the n relays is abnormal, on the basis of a detection result of each of the temperature detection elements. Detecting temperature differences among the n temperature detection elements makes it possible to detect abnormality of the relays.


Inventors:
IBORI SATOSHI
HIRAGA MASAHIRO
HIROTA MASAYUKI
ARAO YUSUKE
TANAKA MAKOTO
Application Number:
JP2012000078883
Publication Date:
October 10, 2013
Filing Date:
March 30, 2012
Export Citation:
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Assignee:
HITACHI IND EQUIPMENT SYS
International Classes:
H02H5/04; H02H7/122; H02M7/48
Domestic Patent References:
JPH02221878A1990-09-04
JPH0556552A1993-03-05
JP2006041407A2006-02-09
JP2008135321A2008-06-12
JP2008206280A2008-09-04
JP2013024718A2013-02-04
JPH02221878A1990-09-04
JPH0556552A1993-03-05
JP2006041407A2006-02-09
JP2008135321A2008-06-12
JP2008206280A2008-09-04
JP2013024718A2013-02-04
Foreign References:
US20050275993A12005-12-15
US20050275993A12005-12-15
Attorney, Agent or Firm:
井上 学
戸田 裕二
岩崎 重美



 
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