System and method for safely powering an appliance user interface without external power

摘要

Systems and methods for safely powering an appliance user interface without external power are provided. One exemplary method includes receiving power generated by rotation of a rotor. The method further includes monitoring for the presence of a safety condition and disabling passive braking of the rotor when the safety condition is present such that the user interface of an appliance is powered. An exemplary washing machine can include a basket and a motor which includes a rotor, the motor being configured to rotate the basket by rotating the rotor. The washing machine can further include a user interface and a motor control circuit configured to drive the motor. The motor control circuit can be further configured to receive power generated by rotation of the rotor, monitor for the presence of a safety condition, and disable passive braking of the rotor when the safety condition is present.

主权项

1. A washing machine comprising:
a basket; a motor which includes a rotor, the motor being configured to rotate the basket by rotating the rotor; a user interface; and a motor control circuit configured to drive the motor; wherein the motor control circuit is further configured to receive power generated by rotation of the rotor, monitor for the presence of a safety condition, and disable passive braking of the rotor when the safety condition is present; and wherein the motor control circuit is configured to apply passive braking to the rotor upon initialization.