Pulse count control for brushed DC motor driven by pulse with modulation

摘要

The present invention provides a method of determining the occurrences of pulses for implementing a pulse count monitoring method for a driving a brushed DC motor driven by a pulse width modulated (PWM) driving current. The method comprises acquiring the driving current signal; performing peak detection on the acquired signal; identifying the largest peaks and thus determining the occurrence of pulses. The peak detect is implemented by fast peak detection or diode peak detection operable to detect appropriate peak widths as determined by the chosen PWM frequency, duty cycle and PWM pulse height.