Arrangement for providing a power supply and transmitting electr

Details Arrangement for providing a power supply and transmitting electr Arrangement for providing a power supply and transmitting electr

1978-09-12

1981-06-09

Groody, James J.

Communications: electrical

Systems

Selsyn type

340149A, 340167A, 340172, 340310R, 178 661, H04B 360, H04Q 138

Patent

active

042727588

ABSTRACT:
An arrangement for both exchanging data between first and second devices and supplying power from the first to the second device, all through only two interconnecting lines or contacts. Data transmission from the first to second device is accomplished by a modulated current generator in the first device connected to the two liens. Data transmission from the second to the first device is accomplished by a modulator which shunts the two lines while the current generator supplies a current, thus varying the voltage across the line in a manner which may be sensed by a comparator in the first device. In order to supply power to the second device, the second device includes a network having at least one unidirectional conduction member, such as a diode, connected to the two lines.

REFERENCES:
patent: 3488517 (1970-01-01), Cowan et al.
patent: 3959772 (1976-05-01), Wakasa et al.
patent: 4007458 (1977-02-01), Hollabaugh
patent: 4016480 (1977-04-01), Hofmann
patent: 4163210 (1979-07-01), Giraud
patent: 4217572 (1980-08-01), Giraud

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