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:
May. 31, 2016
Filed:
Oct. 15, 2004
Hideaki Moriya, Yamatokoriyama, JP;
Haruo Suenaga, Katano, JP;
Hisashi Morikawa, Kitakatsuragi-gun, JP;
Shinichi Sakai, Nara, JP;
Toyotsugu Matsukura, Nara, JP;
Nobuo Shirokawa, Nara, JP;
Hideaki Moriya, Yamatokoriyama, JP;
Haruo Suenaga, Katano, JP;
Hisashi Morikawa, Kitakatsuragi-gun, JP;
Shinichi Sakai, Nara, JP;
Toyotsugu Matsukura, Nara, JP;
Nobuo Shirokawa, Nara, JP;
Abstract
A resonance type high frequency heating apparatus comprising; a direct current power supply; a series connection circuit consisting of a pair of semiconductor switching elements connected in parallel to the direct current power supply; another series connection circuit having a primary coil of a leakage transformer and a capacitor connected to both ends of one of the pair of semiconductor switching elements; and a drive means for driving each of the pair of semiconductor switching elements; wherein a variable dead time preparation circuit is provided in the drive means, and the variable dead time preparation circuit enables dead time to remain constant at below a predetermined frequency and causes the dead time to increase sharply at a point above a predetermined frequency.