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:
Jul. 10, 2012
Filed:
Apr. 04, 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
An object of the present invention is to provide an inverter circuit in which soft start can be implemented by a simple circuit added thereto. In high-frequency heating apparatus for driving a magnetron, a DC power supply is chopped by two semiconductor switching devices, and this is output as an AC current through a resonance circuit. The high-frequency heating apparatus includes a dead time generation circuit for turning off the semiconductor switching devices concurrently. In the high-frequency heating apparatus, a drive unit for driving the aforementioned semiconductor switching devices has a function of limiting the lowest frequency of a frequency with which the semiconductor switching devices are driven. The aforementioned lowest frequency is set to be high at the beginning of operation of the high-frequency heating apparatus, and the aforementioned lowest frequency is set to be lower gradually thereafter.