Patent ID: 8310190
Filing Date: 2012-11-13
Classification: H02P

Abstract:
1. An apparatus for detecting a lock error in a sensorless motor, wherein the sensorless motor comprises at least three coils converged on a neutral point, the apparatus at least comprising: a multiplexer for receiving a coil voltage from one of the coils; a negative booster for receiving a neutralizing voltage from the neutral point to drop the neutralizing voltage; a comparator for comparing the coil voltage with the dropped neutralizing voltage to output a zero-crossing signal, wherein when crossover occurs between the coil voltage and the dropped neutralizing voltage, the zero-crossing signal is converted from having a first logical level into having a second logical level or converted from having the second logical level into having the first logical level; and a timer for counting a time duration during the zero-crossing signal maintained at the first logical level and determining the lock error in the sensorless motor when the time duration exceeds a predetermined period.