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:
Jun. 02, 2009
Filed:
Oct. 12, 2006
Shohei Osaka, Niiza, JP;
Shohei Osaka, Niiza, JP;
Sanken Electric Co., Ltd., Saitama, JP;
Abstract
An induction heating apparatus capable of stably operating at least one switching element contained therein is provided with a control circuitwhich comprises a resonance waveform detectorfor detecting a high frequency AC waveform supplied from an inverter circuitto a heating coilto produce a detection signal DScorresponding to high frequency AC power waveform; a phase comparatorfor producing an adjusting signal PH corresponding to a phase difference between detection signal DSfrom resonance waveform detectorand drive signal Dfrom drive circuit 7; and an addition circuitfor superimposing the drive signal Dfrom drive circuiton detection signal DSfrom resonance waveform detectorto supply to phase comparatorthe superimposed signal on a level same as or over operation threshold value Vfor the phase comparator.