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:
Nov. 28, 2023
Filed:
May. 20, 2019
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Kazuo Ono, Tokyo, JP;
Masahiro Matsumoto, Tokyo, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
In a flow rate sensor, a resistance bridgedetects a change in a gas flow rate. A differential A/D converterconverts an analog signal output from the resistance bridgeinto a digital signal. A disconnection detection circuitdetects disconnection of bonding wiresthat connect the differential A/D converterand the resistance bridge. The disconnection detection unitincludes a detection capacitanceand a comparator. One connection portion of the detection capacitanceis connected to an input node of the A/D converter. The comparatordetects the disconnection of the bonding wiresbased on a potential based on a ratio of an electrostatic capacitance of a P-side input capacitanceor a N-side input capacitanceto an electrostatic capacitance of the detection capacitance. The P-side input capacitanceand the N-side input capacitancerespectively are connected to operation input units of the differential A/D converter