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:
Dec. 28, 1993
Filed:
Mar. 25, 1991
Tomimitsu Noda, Gifu, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A high frequency heating apparatus includes a frequency conversion section including a switching element and converting a commercial power supply frequency to high frequency waves by an on-off control of the switching element, a step-up transformer stepping up an alternating output from the frequency conversion section, a rectification circuit connected at a secondary side of the step-up transformer, a magnetron driven by a direct current power from the rectification circuit, an anode current detection circuit detecting an anode current of the magnetron, and a control circuit for controlling an 'on' period of the switching element in response to a detection signal from the anode current detection circuit so that the anode current is maintained at a predetermined value, thereby stabilizing a high frequency power produced by the magnetron against different commercial power supplies.