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, 2013
Filed:
Apr. 11, 2008
Wilfried Schilling, Kraichtal, DE;
Ralf Dorwarth, Oberderdingen, DE;
Martin Volk, Baden-Baden, DE;
Tobias Schönherr, Kraichtal, DE;
Wilfried Schilling, Kraichtal, DE;
Ralf Dorwarth, Oberderdingen, DE;
Martin Volk, Baden-Baden, DE;
Tobias Schönherr, Kraichtal, DE;
E.G.O. Elektro-Geraetebau GmbH, Oberderdingen, DE;
Abstract
The invention relates to a method for operating an induction heating device. The induction heating device comprises an induction coil and a frequency converter for producing a control voltage for the induction coil. The frequency converter comprises a rectifier rectifying an alternating supply voltage (UN), an intermediate circuit capacitor, looped in between output terminals of the rectifier and equalizing the rectified voltage (UG), and at least one controllable switching element, looped in between the output terminals of the rectifier. According to the invention, in a predetermined discharge interval (INT) before a zero crossing (ND) of the alternating supply voltage (UN), the intermediate circuit capacitor is discharged to a threshold value by controlling the at least one switching element before the induction coil is controlled in order to produce an adjustable heating capacity.