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:
Apr. 15, 2014
Filed:
Aug. 29, 2008
Yasuyuki Muramatsu, Shizuoka, JP;
Yasuyuki Muramatsu, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka, JP;
Abstract
A fuel cell system is arranged to charge a secondary battery, which is detachable from the fuel cell system, and to supply electric power to a load. The fuel cell system includes a cell stack having a plurality of fuel cells and a controller having a CPU. During power generation in the cell stack, the CPU determines whether or not the secondary battery has been removed from the fuel cell system based on a voltage drop in the cell stack. With the determination that the secondary battery has been removed, the CPU turns off a relay and power supply from the cell stack to the load is stopped. The fuel cell system reliably maintains its operation even after removal of the secondary battery.