Heat dissipation system, rotation speed control circuit and method thereof

摘要

A rotation speed control circuit is disclosed. The rotation speed control circuit includes a temperature-controlled voltage duty generator, a pulse-width signal duty generator, a multiplier and a rotation speed signal generator. The temperature-controlled voltage duty generator converts temperature-controlled voltage to digital temperature-controlled voltage and executes linear interpolation operation according to a first setting data so as to output temperature-controlled voltage duty signal. The pulse-width signal duty generator coverts pulse-width input signal to a digital pulse-width input signal and executes linear interpolation operation according to a second setting data so as to output a pulse-width duty signal. The temperature-controlled voltage duty signal and the pulse-width duty signal are executed for multiplication by the multiplier so as to output mixing-duty signal. The rotation speed generator receives the mixing-duty signal and a third setting data, and executes a minimum output duty operation so as to output a pulse-width output signal.

主权项

1. A rotation speed control circuit, comprising:
a temperature-controlled voltage duty generator, converting a temperature-controlled voltage into a digital temperature-controlled voltage and executing a linear interpolation operation according to a first setting data so as to output a temperature-controlled voltage duty signal, wherein the temperature-controlled voltage varies with a temperature change; a pulse-width signal duty generator, converting a pulse-width input signal received to a digital pulse-width input signal and executing the linear interpolation operation according to a second setting data so as to output a pulse-width duty signal; a multiplier, connected to the temperature-controlled voltage duty generator and the pulse-width signal duty generator, and the multiplier executing a multiplication on the temperature-controlled voltage duty signal and the pulse-width duty signal received so as to outputs mixing-duty signal; and a rotation speed signal generator, connected to the multiplier, and the rotation speed signal generator receiving the mixing-duty signal and a third setting data, and accordingly executes a minimum output duty operation so as to outputs a pulse-width output signal.