| 摘要 |
The control circuit (1) for a DC brushless fan (50) includes a rectifying circuit (10) which rectifies a voltage signal (T) that is representative of the rotational speed of the fan. A comparator (20) is used to compare the rectified signal voltage with a reference voltage. A switching device (30) is repeatedly opened and closed in accordance with the compared result, to regulate the fan rotational speed. The reference voltage is generated by a voltage divider formed using a thermistor (40) and a resistor (42). |
