ZERO CROSSING DETECTION CIRCUIT FOR MOTOR CONTROLLER AND METHOD THEREFOR

摘要

A method includes selectively communicating each of a plurality of motor winding signals to a first node at an integrated circuit based on whether the corresponding motor winding is energized. A zero-crossing event at an unenergized motor winding signal is determined based the unenergized motor winding signal and based on a signal at the first node.

主权项

1. A method, comprising:
receiving a first signal from a first energized motor winding; receiving a second signal from a second energized motor winding; receiving a third signal from an unenergized motor winding; communicating the first and second signal to a first node to generate a fourth signal at the first node; isolating the third signal from the first node; and determining a zero-crossing event at the third signal based on the fourth signal.