System and Method for Regulating Motor Rotation Speed

A control pulse generating circuit configured to generate a control pulse signal which is used to regulate a motor rotation speed, comprising:

• a temperature signal processing circuit, configured to receive an environmental temperature signal, and output an electric current signal, wherein the electric current signal has a relationship with the environmental temperature signal;
• a pulse signal processing circuit configured to receive the electric current signal and an input pulse signal, and generate a direct current voltage signal, wherein under certain circumstance, the direct current voltage signal has a relationship with both the environmental temperature signal and the duty cycle of the input pulse signal;
• a triangular wave generating circuit configured to generate a triangular wave signal;
• and
• a control pulse output circuit configured to process the triangular wave signal and the direct current voltage signal, and output a pulse control signal, which, under certain circumstance, has a relationship with both the environmental temperature signal and the duty cycle of the input pulse signal.

A method of generating a control pulse signal, wherein the control pulse signal, under certain circumstance, has a relationship with both an environmental temperature signal and a duty cycle of an input pulse signal, comprising:

• receiving an environmental temperature signal and generating a direct current signal which has a relationship with the environmental temperature signal, wherein the environmental temperature signal is received by using a temperature sensitive resistor;
• receiving an input pulse signal and the direct current signal, and generating a direct current voltage signal, which has a relationship with both the environmental temperature signal and the duty cycle of the input pulse signal;
• and
• receiving the direct current voltage signal and a triangular wave signal, and generating a control pulse signal, wherein the duty cycle of the control pulse signal, under certain circumstance, has a relationship with both the environmental temperature signal and the duty cycle of the input pulse signal.

A cooling system configured to control a temperature associated with an integrated circuit, the cooling system comprising:

• a brushless motor configured to drive a cooling device based on a rotational speed of the motor;
• a temperature monitoring input configured to receive an environmental temperature signal indicating a temperature associated with an integrated circuit;
• a clock input configured to receive a clock signal having a predetermined duty cycle;
• a motor controller configured to receive the environmental temperature signal from the temperature monitoring input and the clock signal from the clock input and coupled to the brushless motor to control the rotational speed of the motor using at least a speed control method by:
• comparing the environmental temperature signal to a predetermined threshold;
• if the environmental temperature signal is less than the predetermined threshold, controlling the rotational speed of the motor using the speed control method and only one of the environmental temperature signal and the clock signal;
• and
• if the environmental temperature signal is greater than the predetermined threshold, controlling the rotational speed of the motor using the speed control method and both of the environmental temperature signal and the clock signal.