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. 06, 2015
Filed:
Jul. 03, 2012
Kenichi Hoshino, Hitachinaka, JP;
Teppei Hirotsu, Tokyo, JP;
Ryosuke Ishida, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
A current control semiconductor device that can detect a current with high precision within an IC of one chip by dynamically correcting a variation in a gain a and an offset b, and a control device using the semiconductor device are provided. A transistor, a current-voltage converter circuit, and an AD converterare disposed on an identical semiconductor chip. Reference current generator circuitsand' superimpose a current pulse Ic on a current of a load, and vary a voltage digital value output by the AD converter. A gain/offset correction unitsubjects a variation in a voltage digital value caused by the reference current generator circuits′ to signal processing, and dynamically acquires gains a, a′ and offsets b, b′ in a linear relational expression of the voltage digital value output by the AD converterand a current digital value of the load. A current digital value calculation unitcorrects a voltage value output by the AD converter with the use of the gain and the offset acquired by the gain/offset correction unit