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:
Aug. 03, 2004
Filed:
Feb. 27, 2003
Izuo Hirota, Toyonaka, JP;
Atsushi Fujita, Mino, JP;
Takahiro Miyauchi, Kobe, JP;
Takeshi Kitaizumi, Toyonaka, JP;
Yuji Fujii, Kobe, JP;
Kouji Niiyama, Kobe, JP;
Hideki Omori, Akashi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An induction heating apparatus can heat aluminum pot etc. with pot vibration noise being suppressed. During a turn-on time of second switching device , an energy is accumulated at choke coil , and at the same time a resonant current with a shorter period than the turn-on time of second switching device or a driving time of first switching device is generated at heating coil , so that during turn-off of second switching device , i.e., during on-time of first switching device , the energy accumulated at choke coil is transferred to second smoothing capacitor . And then the output power is supplied from smoothing capacitor to heating coil , thereby reducing the pot vibration noise, which is caused by pulsating current of input voltage.