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:
Jan. 17, 2012
Filed:
Feb. 13, 2009
Yasunori Nakahashi, Tokyo, JP;
Satoshi Yamane, Saitama, JP;
Yasunori Nakahashi, Tokyo, JP;
Satoshi Yamane, Saitama, JP;
Fuji Electric Systems Co., Ltd., Tokyo, JP;
Abstract
A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Qand a second P-ch MOSFET Qwhich constitute a current mirror circuit, a current adjustment resistor R, a current detection resistor R, and a constant current source I. The current mirror circuit outputs current almost proportional to the charge current of an inductance via a switching device or outputs a current which is the quadratic function of the charge current of an inductance. The sawtooth-shaped waveform generation means adds the constant charge current of the constant current source Iand the current output from the current mirror circuit, charges the capacitor C, and generates a sawtooth-shaped waveform.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile