Patent ID: 9407085
Filing Date: 2016-08-02
CPC Classification: H02H,H02M,H02P

Claim Text:
1. A controller for a brushless motor, the controller being configured to operate in normal mode, error mode, and under-voltage mode, wherein: when operating in normal mode the controller generates control signals for exciting a winding of the motor, monitors the magnitude of an input voltage, switches to error mode in the event that the controller detects an error, and switches to under-voltage mode in the event that the input voltage drops below an under-voltage threshold; when operating in error mode the controller suspends excitation of the winding monitors the magnitude of the input voltage, and switches to under-voltage mode in the event that the input voltage drops below an under-voltage threshold greater than that used in normal mode; and when operating in under-voltage mode the controller suspends excitation of the winding, monitors the magnitude of the input voltage, monitors the magnitude of a supply voltage used to power the controller, switches to normal mode in the event that the input voltage exceeds a restart threshold, and resets itself in the event that the supply voltage drops below a brown-out threshold.