The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2017
Filed:
Feb. 17, 2015
Applicant:
Daikin Industries, Ltd., Osaka-shi, Osaka, JP;
Inventors:
Assignee:
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 6/18 (2016.01); H02P 6/20 (2016.01); H02P 6/182 (2016.01); H02P 1/02 (2006.01); H02P 6/22 (2006.01); H02M 7/46 (2006.01); H02M 7/537 (2006.01); H02P 6/14 (2016.01); H02P 27/06 (2006.01);
U.S. Cl.
CPC ...
H02P 6/20 (2013.01); H02M 7/46 (2013.01); H02M 7/537 (2013.01); H02P 1/029 (2013.01); H02P 6/14 (2013.01); H02P 6/182 (2013.01); H02P 6/22 (2013.01); H02P 27/06 (2013.01); H02P 2203/03 (2013.01);
Abstract
A failure in the activation, of a motor, caused by external noise superimposed on an induced voltage is reduced. A detection circuit is connected to a connection node provided between an upper-arm switching element and a lower-arm switching element, and detects the induced voltage of a fan motor before activation. The switching controller activates the fan motor in accordance with a result of detection by the detection circuit. While the detection circuit detects the induced voltage, the switching controller performs switching control which involves alternately turning ON and OFF of the lower-arm switching element.