Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-10-09
1982-09-28
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307490, 307314, 328161, G06G 700
Patent
active
043520324
ABSTRACT:
The ratio of the inductance of a measuring coil to that of a reference coil is formed by an operational amplifier. Specifically, the measuring coil is connected between the output and the inverting input of the operational amplifier, the reference coil being connected to the inverting input. An AC voltage having substantially symmetrical half waves is applied to the reference coil. The AC voltage is a triangular voltage generated by two additional operational amplifiers. An emitter-follower connected to the output furnishing the triangular voltage decreases the load on the operational amplifiers and therefore allows the connection of a multiplicity of computing stages to the one source of triangular voltage. Additional operational amplifier stages, in conjunction with diodes, constitute a full wave rectifier and filter for the output of the operational amplifier furnishing the ratio signal.
REFERENCES:
patent: 3225289 (1965-12-01), Koppel et al.
patent: 3575616 (1971-04-01), Jordan
patent: 3654424 (1972-04-01), Vanderhelst
patent: 3697778 (1972-10-01), Olson
Engel Gerhard
Wessel Wolf
Heyman John S.
Robert & Bosch GmbH
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