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:
Jul. 16, 2019
Filed:
Jun. 27, 2016
Horiba Stec, Co., Ltd., Kyoto-shi, Kyoto, JP;
Hiroshi Takakura, Kyoto, JP;
HORIBA STEC, Co., Ltd., Kyoto-shi, Kyoto, JP;
Abstract
To achieve both response speed and accuracy required for a flow rate measuring device without sacrificing the simplicity and inexpensiveness of a PWM type D/A converter, the flow rate measuring device includes an analog conversion part adapted to convert a digital signal indicating a measured flow rate value to an analog signal. In addition, the analog conversion part includes: a PWM signal generating circuit that can output three or more specified voltages is configured to, on the basis of the measured flow rate value indicated by the digital signal, select two adjacent voltages, as well as on the basis of the measured flow rate value indicated by the digital signal, set a duty ratio to generate a PWM signal of which a high level and a low level are the two selected voltages, respectively; and a conversion circuit that smooths the PWM signal to convert to the analog signal.