Regulating circuit and method for regulating rotary speed, data processing device, and program code

摘要

A regulating circuit that regulates rotary speed of a pulse-width modulated fan includes a measuring device that determines a period duration (TIst) of a tacho signal (TACH) of the fan, a digital regulating register that acquires a regulation value to drive the fan on the basis of a determined period duration (TIst) and a desired value (Tsoll), a digital control register that adjusts a duty ratio to drive the fan, the digital control register has a smaller register width than the digital regulating register, and a controller that updates the digital control register by evaluating a predetermined number of more significant bits of the digital regulating register.

主权项

1. A regulating circuit that regulates rotary speed of a pulse-width-modulated fan comprising:
a measuring device that determines a period duration (TIst) of a tacho signal (TACH) of the fan, a digital regulating register that acquires a regulation value to drive the fan on the basis of a determined period duration (TIst) and a desired value (Tsoll), a digital control register that adjusts a duty ratio to drive the fan, the digital control register having a smaller register width than the digital regulating register, and a controller that updates the digital control register by evaluating a predetermined number of highest level bits of the digital regulating register relative to lowest level bits of the digital regulating register, wherein the digital control register has a register width of m bits and the digital regulating register a has width of n bits, the controller updating the digital control register by shifting content of the digital regulating register by a bit width of n-m bits so that the highest level bits of the regulation value represent the bits of a digital value with a lower resolution of m bits.