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:
Jan. 17, 2012
Filed:
Feb. 14, 2008
Tomohisa Sato, Hiratsuka, JP;
Tomohisa Sato, Hiratsuka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
In order to securely prevent, even where a boosting unit is provided, a rush current from arising when a contactor is turned on during a transient state, the voltage of a surge absorbing condenser is controlled so that the voltage difference between the power source capacitor and surge absorbing condenser falls in a predetermined range. The control is performed in the following manner: of the two voltage source inverters of the AC-coupled bi-directional DC-DC converter composing a voltage converter as a boosting unit, only the one that is not connected in parallel with a power source capacitor is activated to perform a chopping operation while the generator is operated with the contactor off.