Speed regulating control circuit of pulse-width-modulation computer cooling fan

Abstract

The invention discloses a speed regulation control circuit of a pulse-width-modulation computer cooling fan. The speed regulation control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first capacitor, a second capacitor, a first potentiometer, a second potentiometer, a first comparator, a second comparator, a third comparator, a thermistor, a light-emitting diode, an audion, a multivibrator and the fan. The speed regulating control circuit of the pulse-width-modulation computer cooling fan is a control circuit achieving automatic speed regulating through a pulse-width-modulation cooling fan motor, and the speed of the fan can be automatically regulated according to the temperature inside an instrument; the same-phase input end of the first comparator is connected with the thermistor; and when the potential of the same-phase input end of the first comparator drops due to temperature rising, the output voltage of the first comparator also drops, the duty ratio of the output waveform of the second comparator is improved, and the rotating speed of the fan is increased through the audion.

Description

technical field [0001] The invention relates to a speed regulation control circuit, in particular to a speed regulation control circuit of a computer cooling fan using pulse width modulation. Background technique [0002] Computer is an indispensable tool in people's life and work. Normal operation is a must for every computer. Because the computer is an electrical device, it will convert part of the electric energy into heat when it is working. When the computer is overheated It will affect the working efficiency of the computer, and in serious cases, it will damage the electronic components and affect the normal operation of the computer. Contents of the invention [0003] The object of the present invention is to provide a speed regulation control circuit of a computer cooling fan using pulse width modulation in order to solve the above problems. [0004] The present invention achieves the above object through the following technical solutions: [0005] A speed regula...

AI Technical Summary

Problems solved by technology

[0002] Computer is an indispensable tool in people's life and work. Normal operation is a must for every computer. Because the computer is an electrical device, it will convert part of the electric energy into heat when it is working. When the computer is overheated It will affect the working efficiency of the computer, and in serious cases, it will damage the electronic components and affect the normal operation of the computer.

Images