Electrical transmission or interconnection systems – Nonlinear reactor systems – Logic circuits
Patent
1988-03-16
1989-07-04
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Logic circuits
307411, 307413, 307416, 328 65, 328 67, 376259, 376215, 376254, H02H 324
Patent
active
048453846
ABSTRACT:
Dynamic logic units utilize magnetic cores of rectangular hysteresis loop material wound with an input winding, a pair of output windings connected to a CMOS flip-flop, and a d-c control winding. With a d-c current on the control winding, the core experiences flux reversals in response to a square wave on the input winding to generate output pulses which alternately switch the flip-flop to produce a square wave output which matches the input. In a first embodiment, the output windings are in the form of a center-tapped winding with the center tap grounded to provide a low impedance discharge path for the capacitors in grounded R-C filters on the inputs to the flip-flop which suppress voltage spikes. In a second embodiment, output windings on separate magnetic cores which share an input windings but only one of which has a control winding, are connected in opposition to eliminate the switching spikes in the signal applied to the flip-flop.
REFERENCES:
patent: 1884845 (1932-10-01), Peterson
patent: 2920824 (1960-01-01), Lanning
patent: 2920825 (1960-01-01), Lanning
patent: 2966595 (1960-12-01), Williams
patent: 3104373 (1963-09-01), Salihi
patent: 3305838 (1967-02-01), Kidd et al.
patent: 3541428 (1970-11-01), Schwarz
patent: 3999104 (1976-12-01), Lardennis
patent: 4338650 (1982-07-01), Wierschke
patent: 4513274 (1985-04-01), Halder
patent: 4661310 (1987-04-01), Cook et al.
"Logical and Control Functions Performed with Magnetic Cores", by S. Guterman et al., from Proceedings of the Ire, pp. 291-298.
"The Laddic-A Magnetic Device for Performing Logic", by U. F. Gianola et al., from The Bell System Technical Journal, Jan. 1959, pp. 45-72.
Collected Information on Safety Systems supplied by GEC-Elliott Process Automation Ltd.
Ip Paul
Nath B. R.
Shoop Jr. William M.
Westinghouse Electric Corp.
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