Patent ID: 6285146
Filing Date: 2001-09-04
Classification: H02P

Abstract:
An apparatus for controlling the voltage and current of a brushless DC motor having at least one input terminal, comprising:first means for generating a first signal corresponding to a motor armature voltage;second means for comparing the first signal to a reference voltage and generating a second signal indicative of the difference between the first signal and the reference voltage;third means for generating a third signal corresponding to a motor armature current, and including means for receiving from a motor current source a motor armature current signal, means for generating a time-varying signal, and means for combining the motor armature current signal and the time-varying signal to generate the third signal therefrom;fourth means for comparing the second signal to the third signal, and for generating a fourth signal indicative of a difference between the second and third signals; andfifth means coupled to the fourth means and defining a substantially inductorless connection with the at least one input terminal for pulse width modulating a power source signal according to the fourth signal to thereby generate a pulsed motor supply signal.