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:
Sep. 13, 2011
Filed:
Apr. 22, 2005
Haruo Suenaga, Osaka, JP;
Hideaki Moriya, Nara, JP;
Shinichi Sakai, Nara, JP;
Hisashi Morikawa, Nara, JP;
Toyotsugu Matsukura, Nara, JP;
Nobuo Shirokawa, Nara, JP;
Haruo Suenaga, Osaka, JP;
Hideaki Moriya, Nara, JP;
Shinichi Sakai, Nara, JP;
Hisashi Morikawa, Nara, JP;
Toyotsugu Matsukura, Nara, JP;
Nobuo Shirokawa, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A purpose of the present invention is to provide an inverter circuit capable of suppressing an overshooting phenomenon of an input current at an instantaneous time when an initiating operation of the inverter circuit is switched to the normal operation thereof, and thus, capable of preventing damages of IGBTs and a magnetron. In a high frequency heating apparatus comprising: a control signal forming circuit for forming a control signal from a difference between an input current of an AC power supply and a reference current; a frequency modulated signal forming circuit for correcting rectified voltage/rectified current which are obtained by rectifying the AC voltage/current of the AC power supply based upon the control signal of the control signal forming circuit; and a dead time forming circuit for receiving the output of the frequency modulated signal forming circuit, a control signal converting circuit having a function capable of further lowering the value of the control signal is provided between the control signal forming circuit and the frequency modulated signal forming circuit.