Fan control system and method and heat dissipation system of electronic equipment

A heat dissipation system of an electronic apparatus having one or at least one integrated circuits, comprising:

• at least one temperature sensor arranged correspondingly to some or all of the integrated circuits, for detecting the operation temperature of the corresponding integrated circuits;
• a temperature control module in communication with the temperature sensor to output a first logic signal corresponding to the detected temperature and a first control signal corresponding to operation status of the electronic apparatus;
• a first logic in communication with the temperature control module to output a second logic signal corresponding to the first logic signal and the first control signal;
• a second logic in communication with the first logic, the second logic including at least one relationship of fan rotation speed and operation temperature and being operative to output a second control signal according to the relationship of fan rotation speed and operation temperature corresponding to the first logic signal and the first control signal;
• at least one control circuit to receive the second control signal and to output a voltage corresponding to the second control signal;
• and
• at least one fan, each connected to the corresponding control circuit, driven to rotate by the corresponding voltage.

A fan control method for an electronic apparatus that has at least one integrated circuit, the method comprising:

• detecting the operation temperature of the at least one integrated circuit;
• generating a first logic signal according to the operation temperature and a first control signal according to operation status of the integrated circuit;
• generating a second logic signal according to the first logic signal and the first control signal;
• selecting a relationship between fan rotation speed and temperature according to the second logic signal and generating a second control signal by the relationship;
• and
• outputting a voltage according to the second control signal to drive a fan to rotate.