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:
Oct. 09, 1990
Filed:
Jun. 22, 1989
Masayuki Aoki, Ichinomiya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A high-frequency heat source supplies a predetermined high-frequency heat output. An inverter circuit receives an AC input and supplies a high-frequency output to drive the high-frequency heat source. The inverter circuit includes a circuit for rectifying the AC input, and a switching element for switching a DC output from the rectification circuit. A timing circuit is coupled to the inverter circuit to detect a switching timing of the switching element to the inverter circuit. A controller outputs an ON/Off signal having a predetermined duty ratio corresponding to a heating output set value associated with the predetermined high-frequency heating output. The ON/Off signal is output at a predetermined timing in response to a detection output from the timing circuit. A drive circuit drives the switching element in the inverter circuit in response to the ON/Off signal output from the controller. A first isolation circuit electrically isolates the timing circuit from the controller. A second isolating circuit electrically isolates the controller from the drive circuit.