Patent ID: 7495400
Filing Date: 2009-02-24
Classification: G05D,H05K

Abstract:
1. A temperature control apparatus, comprising: a fan, including: temperature measuring means for measuring a temperature and providing a temperature indicating signal indicating said measured temperature; processing means for providing a second control signal responsive to said temperature indicating signal; pulse generating means for generating pulses responsive to said second control signal; first switching means for switching on and off responsive to said pulses to provide an output signal corresponding to said first control signal via a first conducting terminal, said first switching means having a second conducting terminal operatively coupled to said pulse generating means for receiving said pulses and a third conducting terminal operatively coupled to ground; a first resistor having a first terminal operatively coupled to said first conduction terminal of said first switching means and a second terminal operatively coupled to the third input of said fan; and a second resistor having a first terminal operatively coupled to ground and a second terminal operatively coupled to said second terminal of said first resistor, wherein said first control signal is a current signal, and a circuit formed by the second voltage source and the second resistor provides a predefined current signal to the third input terminal to control said rotating speed to a predefined speed corresponding to a minimal speed.