Fan system with hysteresis character and method thereof

Details Fan system with hysteresis character and method thereof Fan system with hysteresis character and method thereof

2007-03-05

2009-08-25

Ip, Paul (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S471000, C318S473000, C062S229000

Reexamination Certificate

active

07579794

ABSTRACT:
A fan system includes a fan, a hysteresis circuit including a temperature sensor, a first operational amplifier having a negative input end coupled to the temperature sensor, and a second operational amplifier having a negative input end coupled to an output end of the first operational amplifier and having a positive input end coupled to a power supply for outputting a first voltage when the temperature sensed by the temperature sensor is greater than a first temperature, and for outputting a second voltage when the temperature sensed by the temperature sensor is lower than a second temperature. The fan system further includes a fan switch coupled to the hysteresis circuit and the fan for controlling a rotational speed of the fan according to the first voltage or the second voltage outputted from the hysteresis circuit. The first temperature is greater than the second temperature.

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