Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-11-30
1985-05-28
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307262, 307511, 307513, 307529, 328 26, 331 25, G01R 2500, H03K 522
Patent
active
045203210
ABSTRACT:
A phase detector is disclosed in which means are provided for sensing when two AC signals being subjected to phase difference measurement become close in phase, within a predetermined range, and for inverting one of these signals in phase when such a close phase relationship is sensed. The phase difference between the phase inverted signal and the other signal is then measured, and compensation is applied to the measured results such as to compensate for the effects of the phase inversion operation. Insensitivity and "hunting" effects which occur with prior art phase detectors in the region of zero phase difference are thereby eliminated, and an output signal can be obtained which varies in a smooth and continuous manner with variations in the phase difference between the two signals under measurement, over a 360.degree. range.
REFERENCES:
patent: 4105947 (1978-08-01), Crowley
patent: 4119910 (1978-10-01), Hayashi
patent: 4157500 (1979-06-01), Nicoli
patent: 4228368 (1980-10-01), Orban
patent: 4267514 (1981-05-01), Kimsey
patent: 4431969 (1984-02-01), Summers et al.
Itaya Hiroshi
Nakatsugawa Kenji
Anritsu Electric Company Limited
Hudspeth D. R.
Miller Stanley D.
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