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Fan protection device

  • US 6,551,065 B2
  • Filed: 06/08/2001
  • Issued: 04/22/2003
  • Est. Priority Date: 10/21/1999
  • Status: Active Grant
First Claim
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1. A fan protection device, to protect a fan, comprising:

  • a temperature detector, for detecting overheating of the fan, having a temperature-voltage transformer, located at the thermo-generating source of the fan to transform the thermo-energy thereof into a corresponding voltage signal, and an overheating-judgment device to determine whether the temperature of the fan exceeds a predetermined temperature according to the voltage signal output from the temperature-voltage transformer and, further, detect whether the fan is overheated;

    a current detector coupled to the temperature detector to detect driving-current overload of the fan, wherein the current detector has a current-voltage transformer located on the path of the current flow of the fan to transform the current of the fan into a corresponding voltage signal, and an overloading-judgment device to determine whether the current of the fan surpasses a predetermined current value according to the voltage signal output from the current-voltage transformer and, further, detecting whether the fan is overloaded; and

    an alarm unit, for stopping the fan when an event is detected.

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