Airflow detection apparatus

Details Airflow detection apparatus Airflow detection apparatus

2007-11-30

2010-02-16

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Expansible chamber

C318S268000

Reexamination Certificate

active

07661305

ABSTRACT:
An airflow detection apparatus configured to detect airflow of a fan includes a first transistor, an amplifier, an A/D converter, a microprocessor, an indicating circuit, and a stabilizing circuit configured for supplying a stable current to the first transistor. The base and the collector of the first transistor are connected to a power supply. The emitter of the first transistor is connected to the amplifier and the stabilizing circuit. The amplifier receives a voltage signal from between the base and the emitter of the first transistor. The voltage signal is converted into a digital signal by the A/D converter. The microprocessor processes the digital signal and output an indicating signal to the indicating circuit to indicate airflow status of the fan.

REFERENCES:
patent: 5289089 (1994-02-01), Aoki
patent: 5877415 (1999-03-01), Kruse
patent: 2002/0190676 (2002-12-01), Horng et al.

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