Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1993-07-14
1995-05-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
363 65, 327104, 327190, 327594, H02M 322
Patent
active
054163641
ABSTRACT:
A signal isolation apparatus has a first transformer with a primary winding tap receiving an input signal and another primary winding tap receiving a first oscillating signal. A second transformer has a primary winding tap receiving the input signal and another primary winding tap receiving a second oscillating signal. The second oscillating signal is out of phase (typically 180 degrees out of phase) with the first oscillating signal. A rectifier electrically connected between a first secondary winding tap of the first transformer and a first secondary winding tap of the second transformer has a high output terminal and a low output terminal, the low output terminal being referenced to a second secondary winding of the first and second transformers. A signal across the high and low output terminals is an output signal galvanically isolated from the input signal with the same electrical characteristics as the input signal. Because a highly accurate reproduction of the input is achieved, the input can be a constant DC power level or a DC level which varies thereby forming an information carrying signal on the power line.
REFERENCES:
patent: 3852655 (1974-12-01), Justice
patent: 5142468 (1992-08-01), Nerem
Callahan Timothy P.
Johnson Service Company
Le Dinh
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