Electricity: power supply or regulation systems – Remote sensing
Patent
1977-10-26
1979-05-22
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
363 75, G05F 164, H02M 1326
Patent
active
041561759
ABSTRACT:
An amplitude-regulated, distortion-free sine wave voltage source capable of operating from input sine waves, square waves or quasi-square waves, this ferroresonance-simulating inverter apparatus includes a special control winding and shorting switch therefor that is cyclically operated by a control circuit. By varying the point of time during each half cycle at which the control winding becomes short circuited in accordance with cyclic comparisons being made between recurring voltage ramps and an error signal related to system output voltage level, a feedback loop is provided to regulate such output voltage. The transformer secondary is not required to operate in the saturated mode through use of a ferroresonant capacitor in the usual manner, but the effect of ferroresonance is simulated to achieve regulation through the shunting of flux to saturate separate core shunts in a small fraction of the total core. Further reductions of harmonic distortion are attained by incorporating harmonic wave traps in the output permitted by utilizing secondary reactance resonant tuning to the harmonic now made possible by obviating the need for ferroresonance at the fundamental frequency.
REFERENCES:
patent: 3573606 (1971-04-01), Hart et al.
patent: 3818314 (1974-06-01), Bishop et al.
patent: 3914685 (1975-10-01), Van Gilder
patent: 4030025 (1977-06-01), Kakalec
IEEE Trans. Magnetics, vol. MAG 7, No. 3, Sep. 1971 pp. 571-574.
Goldberg Gerald
Ratelco, Inc.
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