Patent ID: 6509708
Filing Date: 2003-01-21
Classification: G11B,H02P

Abstract:
An apparatus for driving a motor comprising:a digital controller for generating pulse width modulation (PWM) signals with predetermined duty factors; one or more duty capacitors, in electrical communication with the digital controller, for converting PWM signals generated by the digital controller into driving voltages applied; one or more PWM decoders, in electrical communication with the digital controller and the one or more duty capacitors, wherein the PWM decoders generate a voltage of the duty capacitors such that the following operations are repeatedly carried out: charging the duty capacitors when the PWM signal is in one predetermined state; and discharging the duty capacitor when the PWM signals are in a state in opposition to the predetermined state; and one or more low pass filters, in electrical communication with the PWM decoders, that generate DC drive signals by removing the AC component of the signal coming from the PWM decoders.