Jade Bird Fire Co., Ltd.

Beijing Jade Bird Universal Fire Protection System Software Service Co., Ltd.

Xuemei Jiang

Yajie Wang

The present disclosure provides an airflow detection circuit, wherein the airflow detection circuit includes: a first thermistor, one terminal of the first thermistor being coupled to a first resistor and a first switch, and the other terminal of the first thermistor being coupled to a first input terminal of a first operational amplifier; a second thermistor, one terminal of the second thermistor being coupled to the first resistor and the first switch, and the other terminal of the second thermistor being coupled to a second input terminal of the first operational amplifier; a voltage source, coupled to the first resistor and the first switch and configured to provide a supply voltage for the first thermistor and the second thermistor through a corresponding supply path based on ON or OFF of the first switch; and a controller, coupled to an output terminal of the first operational amplifier and configured to collect an output signal of the first operational amplifier and determine an airflow flow rate based on the output signal. The airflow detection circuit of the present disclosure senses a temperature through the first thermistor and the second thermistor and determines the airflow flow rate through the output signal of the first operational amplifier, thereby improving the stability, reliability and universality of airflow detection results.

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Beijing, China

Xuemei Jiang