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. 16, 2012
Filed:
Feb. 14, 2008
Tomohisa Sato, Hiratsuka, JP;
Tomohisa Sato, Hiratsuka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A voltage control device and a voltage control method capable of improving efficiency of a system as a whole even when fluctuation in voltage of a capacitor, which is a storage battery, is large are provided. A capacitor for supplying electric power to a predetermined load, an inverter connected to the load, an AC-coupling bi-directional DC-DC converter including two voltage source inverters of which direct-current terminals are connected in series so as to have additive polarity and a transformer for AC-coupling alternating-current terminals of the two voltage source inverters and having a predetermined leak inductance, with one of the two voltage source inverters connected in parallel to a capacitor, for outputting direct-current voltage obtained by increasing capacitor voltage of the capacitor to the inverter, and control unit for generating a command value of the direct-current voltage based on efficiency of the AC-coupling bi-directional DC-DC converter having a value corresponding to the capacitor voltage to output, are provided.