Phase locked loop having electrical zeroing

Details Phase locked loop having electrical zeroing Phase locked loop having electrical zeroing

1978-08-31

1981-02-24

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With compensating features

318608, 324 83FE, G05B 23275

Patent

active

042530512

ABSTRACT:
In apparatus for measuring the relative position between a fixed member and a movable member, as in a flight simulator, means for electrically offsetting the position measurement to compensate for mechanical offsets and the like. The relative position may be extracted by applying reference oscillator signals to a stator winding, thereby inducing a signal in a rotor winding. The rotor signal is communicated to a digitally closed phase lock loop including a phase detector, an integrator, a loop filter, a voltage controlled oscillator, and a frequency divider having a counter. The invention provides value setting means such as thumbwheel switches, and comparison means coupled between the value setting means and the frequency divider counter, for generating a pulse signal when the counter contents corresponds to the value set in the value setting means. This varies the timing of the feedback in the loop and allows an arbitrary number to be present in the counter at a particular time in the reference oscillator cycle. To avoid spurious pulses in the feedback loop, the feedback signal is synchronized to a fixed point in the cycle of the voltage controlled oscillator output which occurs generally in the middle of the pulse from the comparison means.

REFERENCES:
patent: 3668377 (1972-06-01), Inaba et al.
patent: 3689821 (1972-09-01), Slawson
patent: 3889169 (1975-06-01), Hirschman et al.
patent: 3893011 (1975-07-01), Inaba et al.
patent: 4025839 (1977-05-01), Maury
IBM Tech Disclosure Bulletin, vol. 18, No. 7, Dec. 1975, pp. 2317 & 2318.

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