FAN ROTATION SPEED CONTROL SYSTEM

摘要

An exemplary fan rotation speed control system for adjusting rotation speed of a fan includes a switch input module, a rotation speed control module, a signal collecting module, a decoding module, and a display module. The switch input module inputs a rotation speed signal in the rotation speed control module. The rotation speed control module outputs a first direct current (DC) voltage to provide power supply for the fan according to the rotation speed signal. The rotation speed control module adjusts values and directions of the first DC voltage according to the rotation speed signal. The signal collecting module collects rotation information of the fan. The rotation speed control module receives the rotation information and decodes the rotation information to rotation speed values by the decoding module which are displayed on the display module.