Patent ID: 7313466
Filing Date: 2007-12-25
Classification: G06F,H05K

Abstract:
1. A system for automatically detecting a type of a central processing unit (CPU) fan, the system comprising: a setting module configured for setting two pulse width modulation (PWM) duty cycles of the CPU fan, the two PWM duty cycles comprising a value of 100% and another value below 100%; a revolution obtaining module configured for obtaining revolutions of the CPU fan at the two PWM duty cycles respectively over a fixed time period through a sensor; a fan speed calculating module configured for calculating a full revolutions per minute (RPM) and a test RPM of the CPU fan corresponding to the two PWM duty cycles; and a comparing module configured for comparing the full RPM with the test RPM, determining the type of the CPU fan according to the comparative results, and outputting the type of the CPU fan.