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:
Mar. 30, 2010
Filed:
Dec. 12, 2006
Naomi Goto, Shiga, JP;
Yasufumi Kurahashi, Shiga, JP;
Naomi Goto, Shiga, JP;
Yasufumi Kurahashi, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An inverter contains the following structure: an inverter circuit having upper-arm switching elements connected on the positive side of a DC power source and lower-arm switching elements connected on the negative side of the DC power source; a current sensor that detects current flowing between the DC power source and the inverter circuit; and a control circuit that not only effects control of the inverter circuit so that AC is fed to a motor from the inverter circuit according to an ON-period controlled by a PWM system, but also makes a correction to the ON-period so as to allow the current sensor to detect phase current. The control circuit determines an amount of the correction by judging a direction of current of a phase having an intermediate length of the ON-period.