Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-04-21
1989-03-28
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307529, 328133, 328140, H03K 519, G01R 2306
Patent
active
048167045
ABSTRACT:
A frequency-to-voltage converter which responds either to frequency variations or to time period variations of a varying frequency input signal. When arranged to respond to frequency variations, the input signal is mixed with two fixed frequency framing signals having known frequency relationships to the frequency of a fixed frequency reference signal. One framing signal has a frequency greater than the maximum frequency of the input signal and the other framing signal has a frequency less than the minimum frequency of the input signal. By mixing the input signal with the framing signals and then measuring the relative times required to count a prescribed number of cycles of each of the difference signals produced by the mixing, an indication of changes in the input signal frequency relative to the reference signal frequency is developed. When arranged to respond to time period variations, the reference signal is mixed with two variable frequency framing signals having known frequency relationships to the range of frequency variations of the input signal. One framing signal has a frequency range greater than the reference signal frequency and the other framing signal has a frequency range less than the reference signal frequency. By mixing the reference signal with the framing signals and then measuring the relative times required to count a prescribed number of cycles of each of the difference signals produced by the mixing, an indication of changes in the input signal frequency relative to the reference signal frequency is developed.
REFERENCES:
patent: 3944935 (1976-03-01), Plant
Heyman John S.
Wambach Margaret R.
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