| 摘要 |
An airflow detecting apparatus for a fan includes an amplifier circuit ( 100 ), a comparator circuit ( 200 ), a micro control unit (MCU) (U 1 ), and an indicating circuit ( 300 ). The amplifier circuit has an input terminal receiving a voltage signal from a piezoelectric film (H 1 ) disposed at an airflow path of the fan, and outputs an amplified voltage signal at an output terminal. The comparator circuit has an input terminal receiving the amplified voltage signal from the amplifier circuit and compares the amplified voltage signal with a reference voltage signal received at another input terminal of the comparator circuit, and outputs a voltage level signal at an output terminal. The MCU receives the voltage level signal from the comparator circuit and processes it to output an indicating signal. The indicating circuit receives the indicating signal from the MCU and indicates status of airflow.
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