Signal duty detecting apparatus and motor driving apparatus having the same

摘要

There are provided a signal duty detecting apparatus detecting a duty of a pulse width modulation (PWM) signal by counting a signal, among signals present in a preset period of the PWM signal, having a predetermined level or higher and a motor driving apparatus having the same. The signal duty detecting apparatus includes: a level detector detecting levels of an input signal; a counter counting the levels detected by the level detector; and a duty calculator calculating a duty of the input signal based on the levels counted by the counter.

主权项

1. A signal duty detecting apparatus comprising:
a level detector detecting levels of an input signal; a counter counting the levels detected by the level detector; a duty calculator calculating a duty of the input signal based on the levels counted by the counter; a timer providing a preset time to at least one of the level detector, the counter, and the duty calculator; a frequency/period detector detecting a frequency and a period of the input signal; and a period setter providing a preset period.