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Title:
POWER CONVERSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/002016
Kind Code:
A1
Abstract:
The present invention relates to a power conversion device including an inverter for, by using semiconductor switches (4), converting the voltage of a DC power supply (2) to an AC voltage having arbitrary magnitude and frequency to supply the AC voltage to a load such as, for example, an electric motor (5) and also including a switch portion (3) provided in a DC portion of the inverter. In the present invention, a capacitor (1) is connected between the positive and negative electrodes of the DC power supply (2) through the switch portion (3), and a constant voltage element is connected in parallel with the capacitor (1), wherein the constant voltage element operates such that when the both-end voltage thereof becomes a certain voltage or more, the electric resistance thereof decreases sharply, current flows therethrough, and then the both-end voltage is limited to a specific voltage. The constant voltage element includes a varistor (6), a Zener diode (7), an avalanche diode, and a combination of the Zener diode (7) and a self-turn-off semiconductor element such as, for example, an IGBT and a MOSFET. The above configuration protects each of the components constituting the power conversion device from excess voltage and avoids increasing the capacitance and volume of the capacitor (1).

Inventors:
ODAKA AKIHIRO (JP)
TOBA AKIO (JP)
AKIBA SHINYA (JP)
Application Number:
JP2012/064987
Publication Date:
January 03, 2013
Filing Date:
June 12, 2012
Export Citation:
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Assignee:
FUJI ELECTRIC CO LTD (?2109530, JP)
ODAKA AKIHIRO (JP)
TOBA AKIO (JP)
AKIBA SHINYA (JP)
International Classes:
H02M7/48; H02H7/122; H02H9/04
Foreign References:
JPH08182388A1996-07-12
JP2010148199A2010-07-01
JP2000324797A2000-11-24
JP2007089334A2007-04-05
Other References:
See also references of EP 2728733A4
Attorney, Agent or Firm:
MORITA YUICHI (?1010051, JP)
Morita Yuichi (?1010051, JP)
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Claims:



 
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