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:
Jan. 02, 2007
Filed:
Jul. 12, 2005
Hiromi Ariyoshi, Kariya, JP;
Chiaki Mizuno, Toyota, JP;
Hiromi Ariyoshi, Kariya, JP;
Chiaki Mizuno, Toyota, JP;
Denso Corporation, Kariya, JP;
Abstract
In a heat-radiation type flow sensor, a heater resistor is connected to a fixed resistor in series with a transistor. An electrical potential between the heater resistor and the transistor is supplied to an inverting input terminal of an operational amplifier. A reference voltage is supplied to a non-inverting input terminal of the operational amplifier. An output potential of the operational amplifier is supplied to a base of the transistor. Since the electrical potential between the heater resistor and the transistor is supplied to the inverting input terminal of the operational amplifier, the airflow sensor includes only a negative feedback circuit. Thus, the airflow sensor exhibits strong endurance against electromagnetic interferences.