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:
Sep. 01, 2009
Filed:
Jul. 19, 2005
Naomi Goto, Shiga, JP;
Naomi Goto, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A small and highly vibration-proof inverter capable of detecting a phase current without requiring the development of complicated control software and without causing any current distortion is provided. Shunt resistors () serving as a kind of current detector are provided, respectively, between lower arm switching elements X, Y, Z) in only two phases—and the minus side of a DC power supply. An identical ON period is reduced from the ON periods of upper arm switching elements (U, V, W) in the carrier cycle entirely for three phases. Consequently, phase current is detected for the two phases provided with the shunt resistors (). The inverter can detect the phase current without complicating the control software and without causing any current distortion, by controlling inverter circuit () with control software incorporated in control circuit () through connection lines ().