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:
Oct. 07, 2008
Filed:
Mar. 17, 2003
Akira Hatai, Tokyo, JP;
Mahito Unno, Tokyo, JP;
Masakatsu Daijou, Tokyo, JP;
Kiyoshi Eguchi, Tokyo, JP;
Akira Hatai, Tokyo, JP;
Mahito Unno, Tokyo, JP;
Masakatsu Daijou, Tokyo, JP;
Kiyoshi Eguchi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In the inverter device of the invention, when a power source connected to an electrolytic capacitoris interrupted, a switching control circuitcontrols switching elements of an inverter main circuitto operate to supply a current to a load, thereby discharging charges of the electrolytic capacitor, and an electrolytic capacitor electrostatic capacitance calculatorcalculates the electrostatic capacitance of the electrolytic capacitor, on the basis of: a discharged charge amount which is obtained from an outflow current Ic from the electrolytic capacitor, and a discharge time; and a discharge voltage ΔV which is a voltage drop from beginning of discharging of the electrolytic capacitor