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Abstract

This invention is directed to a digital feedback control system. The control system includes a controlled device which generates an output signal representative of the operation of that device, with that output signal being a relatively high frequency carrier signal having a relatively slowly varying (compared to the carrier signal) envelope. The control system further includes a difference network for generating an error signal representative of the difference between an input command signal and a sensor signal derived from the output signal of the controlled device. A feedback network is responsive to the output signal to provide the sensor signal. The feedback network includes a selectively operative integrator which generates an integrated signal representative of the integral of the output signal. The feedback system further includes a selectively operable network for resetting the integrator. A selectively operable analog-to-digital (A/D) converter is adapted to generate a digital signal representative of the integrated signal. A controller is operative during each cycle of the carrier signal to sequentially enable the integrator during a predetermined portion of each cycle, followed by enabling the A/D converter and finally enabling the reset network.

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First Claim