Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1982-06-10
1985-01-22
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
318141, 322 17, 322 20, G01R 2316
Patent
active
044954603
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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patent: 3656048 (1972-04-01), Hauf
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Levy Stewart J.
The Charles Stark Draper Laboratory Inc.
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