초록 ▼

A circuit can be configured to process signals from either a resolver or an encoder to derive an indication of the sensed angular position. (1) When the circuit is configured for an encoder, the output from the encoder is periodically sampled. The phase relationship of the encoder input signals cont

A circuit can be configured to process signals from either a resolver or an encoder to derive an indication of the sensed angular position. (1) When the circuit is configured for an encoder, the output from the encoder is periodically sampled. The phase relationship of the encoder input signals controls a counter. The output of the counter is periodically sampled to provide the position indication. (2) In the resolver configuration, the counter is rest at regular intervals. An apparatus detects zero crossings from the resolver signal and in response thereto samples the counter output to provide a measurement of the time interval between the counter reset and the zero crossing. The magnitude of the time interval corresponds to the phase angle of the resolver signal and hence to the angular position.

대표청구항 ▼

A system for processing signals from a transducer for monitoring the angular position of an object rotatable in either of two directions, which transducer may be either a first type providing first and second signals whose phase relationship indicates the direction of the object\s rotation and whose

A system for processing signals from a transducer for monitoring the angular position of an object rotatable in either of two directions, which transducer may be either a first type providing first and second signals whose phase relationship indicates the direction of the object\s rotation and whose number of amplitude transitions relative to an index pulse from the transducer indicates the angular position or a second type of transducer providing an output signal whose phase varies with changes in the angular position, said system comprising: first, second and third input terminals for coupling the transducer to said system said first terminal for receiving the first signal from the first type of transducer, said second terminal for receiving the second signal from the first type of transducer and the output signal from the second type of transducer, and the output signal from the receiving the index pulse from said first type of transducer; a source of a pulsed clock signal and a sampling signal; means coupled to said second input terminal for detecting zero crossings of the signal applied to that terminal; a signal processor coupled to said input terminals for detecting the phase relationship between the signals applied to the first and second input terminals to produce a signal indicating the direction of the object\s rotation and to produce a counter enable signal, and for producing a counter reset signal in response to the signals applied to the three input terminal; means for counting the pulses of the clock signal in response to a signal applied to an enable terminal. The direction of the counting being in response to a signal at a direction input terminal, said counting means having means for initializing its count to a given value in response to a signal applied to a reset terminal; a first position register for storing a count from said counting means in response to a signal applied to an enable terminal of said first position register; and mode selection means which in a first state for the first type of transducer couples the counter reset signal from said signal processor to the reset terminal of said means for counting, couples the sampling signal to the enable terminal of said first position register, couples the direction indicating signal of said signal processor to the direction input terminal of said means for counting, and couples the counter enable signal from said signal processor to the enable terminal of said means for counting; and in a second state for the second type of transducer couples an output of the means for detecting zero crossings to the enable terminal of said first position register, couples the sampling signal to the reset terminal of said means for counting, and applies signals to enable to means for counting to count in one direction. A system for determining the position of an object from an output signal of a transducer in which the phase of the output signal varies with the position, said system comprising: a signal generator which produces an alternating clock signal and a sampling signal having a period substantially equal to a plurality of period of the transducer output signal; means for counting cycles of said clock signal to produce a count indicative of the position of the object and having a count reset terminal; means for coupling the sampling signal to the count reset terminal of said means for counting; a register for storing the count from said counting means in response to a signal applied to an enable terminal; means for generating a signal indicative of zero crossings in the transducer output signal; and means responsive to the signal indicative of zero crossings and to said sampling signal for producing a signal at the enable terminal of said register. A system for determining the position of an object from two quadrature output signals from a transducer coupled to the object, the transducer also producing a periodic index signal, said system comprising: a signal processor for detecting the phase relationship of the transducer output signals to produce a direction signal, and producing a reset signal in response to the two output signals and the index signal; a source of an alternating clock signal; a bidirectional counter for counting the cycles of said clock signal in response to the direction signal of said processor to produce a count indicative of the position; and means for resetting the count of said counter having a first mode in which upon the occurrence of the reset signal the count is always reset to the same value, and having a second mode in which upon the occurrence of the reset signal the counter is reset to either a first or a second value in response to the direction signal.