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:
May. 22, 2012
Filed:
Jan. 07, 2008
Applicants:
Hirohito Maeda, Osaka, JP;
Keisuke Shimatani, Osaka, JP;
Masakazu Katou, Osaka, JP;
Takeomi Ukai, Osaka, JP;
Hironobu Mizobe, Osaka, JP;
Nobuki Kitano, Osaka, JP;
Inventors:
Hirohito Maeda, Osaka, JP;
Keisuke Shimatani, Osaka, JP;
Masakazu Katou, Osaka, JP;
Takeomi Ukai, Osaka, JP;
Hironobu Mizobe, Osaka, JP;
Nobuki Kitano, Osaka, JP;
Assignee:
Daikin Industries, Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 35/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A boot capacitor that functions as an operating power supply for a high-arm-side transistor provided in an inverter has to be charged prior to normal operation of a motor. This operation of charging the boot capacitor is performed at a carrier frequency that is lower than a carrier frequency for the normal operation.