Patent ID: 6700767
Filing Date: 2004-03-02
Classification: G05D

Abstract:
A temperature-based cooling fan control structure comprising:a magnetic induction system in which magnetic induction effect is produced to form multiple magnetic pole pairs (N and S poles) and quick polar changes are allowed over these magnetic pole pairs, such that a cooling fan operating under said control structure keeps rotating in one direction under magnetic repulsion; a thermistor which measures ambient temperature and adjusts a terminal voltage thereof according to the measure temperature; a voltage amplification system which sets a voltage amplifying degree for said terminal voltage and amplifies said terminal voltage according to said set voltage amplifying degree; a rotating speed control system which receives magnetic induction and repulsion signals sent by said magnetic induction system and voltage amplification signals sent by said voltage amplification system to adjust rotating speed of said cooling fan; means for setting fan rotating speed which sets a voltage needed by a basic rotating speed of said cooling fan for said rotating speed control system to compare said basic voltage with said terminal voltage amplified by said voltage amplification system, so that a result from said comparison is used by said rotating speed control system to adjust fan rotating speed; and a timing trigger capacitor which periodically actuates said cooling fan to rotate and diffuse heat when said cooling fan is temporarily stopped under an external force.