Title:
FAILURE DIAGNOSIS METHOD, POWER CONVERSION DEVICE, MOTOR MODULE, AND ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/240004
Kind Code:
A1
Abstract:
The failure diagnosis method according to the present disclosure is used in a power conversion device equipped with at least one H-bridge to diagnose a failure of the H-bridge. The failure diagnosis method includes: a step of generating a monitoring signal for monitoring a failure of an H-bridge on the basis of a first current sine wave of a phase current, a second current sine wave obtained by shifting the phase of the first current sine wave by 90 degrees, and the rotational speed of a motor; a step of generating a pre-failure signal on the basis of the results of comparison between the monitoring signal and a failure level threshold value; and a step of calculating the logical product of the pre-failure signal and an activation signal for enabling or disenabling the pre-failure signal, thereby generating a failure signal indicating whether the H-bridge is failed or not.
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Inventors:
GHADERI AHMAD (JP)
Application Number:
PCT/JP2019/022507
Publication Date:
December 19, 2019
Filing Date:
June 06, 2019
Export Citation:
Assignee:
NIDEC CORP (JP)
International Classes:
H02P27/08; B62D5/04; H02M7/48; H03K17/00
Foreign References:
| JP2004215328A | 2004-07-29 | |||
| JP2011041366A | 2011-02-24 | |||
| JP2010268555A | 2010-11-25 | |||
| JP2013031356A | 2013-02-07 |
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