Two wire interface circuit

Details Two wire interface circuit Two wire interface circuit

1987-07-15

1988-11-29

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307311, 307491, 307549, H03K 19092, H03K 508

Patent

active

047884584

ABSTRACT:
An interface circuit having a first reference terminal and a first input terminal for receiving a first input current signal, referenced to said first reference terminal from a first input current signal source. The circuit also has a second reference terminal and a second input terminal for receiving a second input current signal referenced to said second reference terminal from a second input current signal source. The second input current signal has a first and second signal current level. The interface circuit comprises a first receiver means coupled between the first input terminal and a first receiver means reference terminal. The first receiver means is responsive to the first input current signal first and second signal current levels for providing a first output signal at respective first and second levels. The first output signal is referenced to the second reference potential at a first signal output terminal. A second receiver means is coupled between the first receiver reference terminal and the first reference terminal. The second receiver means is responsive to the second input current signal for decreasing and increasing the resistance between the first receiver reference terminal and the first reference terminal to predetermined values. The input resistance between the first receiver reference terminal and the first reference terminal being substantially independent of the first input current signal first and second signal current levels.

REFERENCES:
J. Glaab, "Optical Couplers Isolate, Control and Monitor to Allow 6-kV Supply to Float", Electronic Design 4, Feb. 15, 1977, pp. 134 & 136.
NAC publication, "Remote Power Controller for the Advanced Aircraft Electrical System", pub. by Naval Avionics Center, May 1982, cover & pp. 4-14.
Rockwell International Technical Proposal, T84-475/201, vol. II, 14 Jun. 1984, title "Airborne Solid State DC Power Controllers", cover, forward, and pp. 9, 10, and 11.

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