Fault tolerant isolation between devices powered by separate pow

Details Fault tolerant isolation between devices powered by separate pow Fault tolerant isolation between devices powered by separate pow

1995-05-19

1997-03-04

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 18, 307 19, 307 20, 307 21, 307 22, 307 23, 307 24, 307 25, 307 26, 307 27, 307 28, 307 29, H01H 3500

Patent

active

056082754

ABSTRACT:
A fault tolerant isolation system providing fault tolerant electrical isolation between different components receiving power from separate power sources regardless of which of the power sources fails. One power source provides operating voltage to an isolation device, which is a transceiver, buffer, quick switch, etc. The other power source activates a transistor switch coupled to the output enable input of the isolation device, and a current limit device is provided between the output enable and power inputs of the isolation device. In this manner, failure of either power source disables the isolation device and therefore provides fault tolerant isolation between the devices on either side. In the preferred embodiment, the isolation device acts as a high impedance open switch if its power is removed thereby isolating the devices on either side. The transistor switch is implemented using a field-effect transistor (FET), which is deactivated when the other source fails, where the output enable is pulled high by the first power source thereby disabling the outputs of the isolation device. Voltage drop devices such as diodes may be used to lower the voltage of either source to the appropriate operating voltage of the isolation device, if necessary.

REFERENCES:
patent: 4890005 (1989-12-01), Schornack

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