CONTROLLER FOR BRUSHLESS DC MOTOR WITH FLEXIBLE STARTUP AND METHOD THEREFOR

摘要

A controller for a brushless direct current (BLDC) motor includes a pulse width modulator and a control circuit. The pulse width modulator provides a plurality of phase control signals to control corresponding ones of a plurality of phases of the BLDC motor. The control circuit controls the pulse width modulator to provide pulses to the plurality of phases to control a speed of the BLDC motor by causing the pulse width modulator to adjust widths of the pulses when a measured current in an active one of a corresponding phase exceeds a threshold in a startup mode. In one form, the controller is part of a BLDC motor system which also includes a plurality of phase drivers each having inputs for receiving respective ones of said plurality of phase control signals, and outputs adapted to couple to corresponding phases of the BLDC motor.

主权项

1. A controller for a brushless direct current (BLDC) motor, comprising:
a pulse width modulator for providing a plurality of phase control signals to control corresponding ones of a plurality of phases of the BLDC motor; and a control circuit for controlling said pulse width modulator to provide pulses to said plurality of phases to control a speed of the BLDC motor by causing said pulse width modulator to adjust widths of said pulses when a measured current in an active one of a corresponding phase exceeds a threshold in a startup mode.