Thermal flowmeter and method having a self-heated element controlled to operate differently under high and low phases of square wave signal
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United States of America Patent
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Jul 28, 2020
Grant Date -
Dec 6, 2018
app pub date -
Nov 24, 2016
filing date -
Nov 24, 2015
priority date (Note) -
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Abstract
A thermal flowmeter comprises a heating element thermally coupled to a flowing medium, a first temperature sensor and second temperature sensor. The first temperature sensor detects a flowing medium temperature in a region not affected by the heating element. The second temperature sensor detects a temperature of the heating element and also serves as a heating element. A control unit controls heating power of the heating element based on the difference between the detected temperatures at a predetermined time. The control unit provides a square wave signal to the second temperature sensor so that in a high phase it acts as heating element and in a low phase as a temperature sensor.
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