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:
Oct. 23, 2012
Filed:
Jun. 02, 2009
Shunzou Ohshima, Kosai, JP;
Shunzou Ohshima, Kosai, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
To provide an overcurrent protection apparatus for a load circuit which can detect an overcurrent accurately without being influenced by the offset voltage Voff of an amplifier (AMP). When the amplifier (AMP) has the offset voltage Voff which is a positive value (Voff>0), a current obtained by subtracting a current Ia from a current Iflowing through a resistor Rby conducting a current source IA is flown into a resistor R. In contrast, when the amplifier (AMP) has the offset voltage Voff which is a negative value (Voff<0), a voltage drop is generated at a resistor Rby conducting a current source IB to thereby control so that a voltage Vds becomes same as the voltage generated at the resistor R. Thus, since a voltage Vgenerated at the resistor Rbecomes a voltage from which the influence of the offset voltage Voff is eliminated, it is possible to determine an overcurrent accurately by eliminating the influence of the offset voltage Voff.