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. 09, 2002
Filed:
Apr. 13, 2001
Junichi Takagi, Tochigi-ken, JP;
Makoto Ishii, Utsunomiya, JP;
Noriaki Arakawa, Tochigi-ken, JP;
Takeshi Wakatabe, Sano, JP;
Hideki Yoshida, Tochigi-ken, JP;
Hideyuki Nakamura, Utsunomiya, JP;
Hideo Kumakura, Ashikaga, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A refrigerator, having a motor for driving a compressor, an inverter for controlling the operation of the motor, a converter responsive to AC to perform a boosting function to supply DC of variable voltage to the inverter, converter control means for controlling the converter so that a plurality of DC voltages are outputted thereby and inverter control means for controlling the inverter in pulse width modulation each of the plurality of voltages. The lowest voltage among the plurality of voltages being a voltage which turns off the boosting function of the converter.