Combined data and power transmission

Details Combined data and power transmission Combined data and power transmission

1996-11-14

1999-01-12

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

With particular coupling link

34031001, 34031003, 34031006, 34031007, G08B 108

Patent

active

058595848

ABSTRACT:
A combined data and power transmission arrangement has one or more power supplies and loads interconnected by a power transmission line, with transmitters and receivers for transmitting a digital data signal over the transmission line. The transmitter and receiver each include an inductor for providing a high impedance barrier to a data signal on the line, so as to isolate the data signal from the power supply and load. The receiver includes circuits for tracking the mid-point value of the data signal to produce a threshold value, and for comparing the threshold value with the data signal to produce an output signal. The threshold value is a controlled positive feedback signal derived from the output of the comparator by way of a positive feedback loop having a time constant approximately equal to the time constant of the transmitter.

REFERENCES:
patent: 4029904 (1977-06-01), Papeschi
patent: 4633218 (1986-12-01), Palsgrove
patent: 5391932 (1995-02-01), Small
patent: 5644286 (1997-07-01), Brosh et al.

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