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, 2008
Filed:
Aug. 19, 2004
Yue Yang, Hiratsuka, JP;
Fumiaki Ikuta, Hiratsuka, JP;
Shinichi Takase, Hiratsuka, JP;
Gorou Atsuta, Hiratsuka, JP;
Yue Yang, Hiratsuka, JP;
Fumiaki Ikuta, Hiratsuka, JP;
Shinichi Takase, Hiratsuka, JP;
Gorou Atsuta, Hiratsuka, JP;
Neturen Co., Ltd., Tokyo, JP;
Abstract
A converter () converts an AC electric power (e) to the DC electric power with a DC voltage value corresponding to a setting. An inverter () is controlled by a frequency electric power control circuit () to convert the DC electric power to a dual frequency AC electric power for alternately outputting low and high frequencies at a frequency ratio (duty) corresponding to the setting. A matching transformer () having a tap (C) at which the resonance impedance corresponds to the output impedance of a generator () receives the dual frequency AC electric power. A low-frequency series resonance circuit () or a high-frequency series resonance circuit () is caused to provide a series resonance, thereby causing an induction heating coil () to induction heat a workpiece-to-be-heated (). In this way, the single generator () and the single induction heating coil () are used to effectively induction heat the workpiece-to-be-heated () by means of the dual frequency resonance.