Patent ID: 7619535

Claim:
A power monitoring apparatus of a fan, for receiving an input voltage, from exterior, comprising: a starting unit receiving the input voltage and starting the fan according to the input voltage, wherein the starting unit comprises a first switch element and a second switch element, wherein the first switch element has a first end for receiving the input voltage and has a second end electrically connected to the fan so as to switch on the fan, the second switch element electrically connected to the first switch element for controlling the first switch element, and wherein the starting unit further comprises a capacitor having one end, a resistor having one end connected to the end of the capacitor, the other end of the capacitor electrically connected to the first switch element, and the other end of the resistor electrically connected to a ground so as to achieve a soft-start effect; and a voltage detecting unit electrically connected to the starting unit and generating a warning signal when the input voltage is not equal to a first reference value.