Coded data generation or conversion – Phase or time of phase change – Synchro or resolver signal
Patent
1990-08-24
1992-01-07
Williams, Howard L.
Coded data generation or conversion
Phase or time of phase change
Synchro or resolver signal
341114, 377 17, 377 45, H03M 148, H03K 2362
Patent
active
050795490
ABSTRACT:
A digital resolver is provided that accepts an analog representation of an angular or linear displacement within a reticle modulation cycle of a rotatable or translatable member, and provides a highly accurate output digital representation of the displacement within the cycle, even during rapid movement of the member. An encoder cooperative with the interpolator receives an analog signal that represents the displacement, and yields a pair of quadrature-phased sine wave signals accordingly. These signals are provided to the interpolator, wherein each is multiplied by a stored digital representation of a trigonometric function of the output digital signal. The resulting products are then added so as to provide an error signal which is used to drive a digital control loop, such that a digital output signal is provided that represents displacement within a reticle cycle. The control loop includes an up-down counter, and an asynchronous count generator operative to receive the error signal and drive the counter promptly thereafter. Within the asynchronous count generator, no clock signal is employed. Instead, an asynchronous digital circuit promptly provides a count pulse to an appropriate input of the up-down counter, the output providing an accurate digitized representation of the displacement within a reticle cycle of the member. The counter output is also fed back to be multiplied by the quadrature-phased signals.
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patent: 4965816 (1990-10-01), Shih et al.
"Technology Update": Synchro/Resolver Converters Bring Low Cost and Small Size to Motion-Control Systems, EDN Oct. 30, 1986, pp. 61-68.
Dynamics Research Corporation
Williams Howard L.
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