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. 28, 2019
Filed:
Jan. 09, 2017
Renesas Electronics Corporation, Tokyo, JP;
Masanori Otsuka, Tokyo, JP;
Wataru Saito, Tokyo, JP;
Yoshitaka Jingu, Tokyo, JP;
Yasuhiko Kokami, Tokyo, JP;
Satoshi Kondo, Tokyo, JP;
Junya Horishima, Tokyo, JP;
RENESAS ELECTRONICS CORPORATION, Tokyo, JP;
Abstract
According to one embodiment, a current detection circuit () includes: a detection resistor (Rs) provided between a solenoid valve () and a solenoid driver (); an amplification unit () configured to amplify a detected voltage of the detection resistor (Rs); an AD converter () that is driven by a reference voltage (Vref) generated based on a reference current (Iref) and configured to convert an output voltage from the amplification unit () into a digital value and output the digital value as a detected current value (D); and a correction unit configured to perform a correction on the detected current value (D). The correction unit includes: a temperature sensor (); a storage unit () configured to store information about temperature characteristics of the detected current value (D) generated due to temperature characteristics of a reference current in each of two or more different temperature regions; and an operation unit configured to apply, to the detected current value (D), a first correction coefficient calculated based on a detection result of the temperature sensor () and information about temperature characteristics of the detected current value (D) stored in the storage unit ().