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. 22, 2007
Filed:
Jan. 07, 2004
Kenichi Kubota, Saitama, JP;
Masaki Ohshima, Saitama, JP;
Yukihiro Nozaki, Saitama, JP;
Hiroyuki Haga, Saitama, JP;
Masanori Hayashi, Saitama, JP;
Kenichi Kubota, Saitama, JP;
Masaki Ohshima, Saitama, JP;
Yukihiro Nozaki, Saitama, JP;
Hiroyuki Haga, Saitama, JP;
Masanori Hayashi, Saitama, JP;
Shindengen Electric Manufacturing Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a switching circuit comprising a current detecting circuit that detects current waveform of a main switch in real time waveform and outputs it in low impedance. The switching circuit comprises the current detecting circuit having the main switch (), of which on-voltage shows resistance characteristics, wherein a gate terminal is connected to a driving circuit () and further either terminal of drain or source thereof is connected to a fixed potential () and the other terminal thereof is connected to a load circuit () respectively, a first resistance element (), of which resistance value is higher than on-resistance of the main switch connected to the fixed potential (), a subsidiary switch (), a source terminal thereof is connected to the first resistance element (), an amplifier () that amplifies comparatively voltage generated in the first resistance element () and outputs to a gate terminal of the subsidiary switch () and the second resistance element () that generates voltage by amplifying on-current of the main switch () by connecting to the drain terminal of the subsidiary switch ().