GRID CONNECTION APPARATUS - SANYO ELECTRIC CO

Title:

GRID CONNECTION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2011/065278

Kind Code:

A1

Abstract:

Provided is a grid connection apparatus, wherein the space necessary for installing a grid connection relay is made to be small, and the state of contacts of the grid connection relay can be monitored. When a commercial power system (30) is in normal operation state, an inverter circuit (5) is controlled to be in stopped state, and the grid connection relays (7) are controlled to be in opened state, detection of whether or not the contact of a first grid connection relay (71) or a second grid connection relay (72), which comprise the grid connection relay (7), is welded together can be conducted before a grid connection is made between the inverter circuit (5) and the commercial power system (30), by detecting the potential difference between the W side of the first grid connection relay (71) and the Z side of the second grid connection relay (72), and the potential difference between the Y side of the first grid connection relay (71) and the X side of the second grid connection relay (72), with photocouplers (91, 95), respectively.

Inventors:

MORITA ISAO (JP)
MAKINO YASUHIRO (JP)

Application Number:

PCT/JP2010/070559

Publication Date:

June 03, 2011

Filing Date:

November 18, 2010

Export Citation:

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Assignee:

SANYO ELECTRIC CO (JP)
MORITA ISAO (JP)
MAKINO YASUHIRO (JP)

International Classes:

H02J3/38; H02M7/48

Foreign References:

JP2004187362A	2004-07-02
JP2000173428A	2000-06-23
JP2007026741A	2007-02-01

Other References: