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:
Mar. 03, 2009
Filed:
Jul. 26, 2006
Takeo Gokita, Tokyo, JP;
Takakazu Imai, Tokyo, JP;
Takeo Gokita, Tokyo, JP;
Takakazu Imai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A current flowing through a measuring target coil increases when a pulse signal is high. A voltage corresponding to instantaneous value of the current through the coil is input to input terminal. A blanking signal generator circuit generates signal which has predetermined pulse width and rises in synchronization with rise of the pulse signal. During period in which this signal is high, first switch becomes ON and first capacitor holds the voltage at the input terminal. A second switch becomes ON when first switch becomes OFF to connect second capacitor to connection node between resistors, and disconnects second capacitor from connection node when the pulse signal becomes low. Second capacitor is charged with voltage corresponding to average value of an amount of increase in the current through the coil. A voltage obtained by adding the voltage charged in first capacitor to this charged voltage is supplied to third capacitor.