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# Circuit for Reliability

IP.com Disclosure Number: IPCOM000093909D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 22K

IBM

## Related People

Marcus, MP: AUTHOR

## Abstract

This circuit redundancy achieves greater reliability. Indicator lamp 1, used as an example, is subject to frequent failures and gives rise to excessive maintenance costs. Three lamps 1, 2 and 3, rather than a single lamp, are connected in series between the terminals of a voltage supply. Resistor 4 is connected in parallel with lamp 2. Resistor 5 is connected in parallel with lamp 3. One of the resistors has a significantly higher value of resistance than the other. Initially, lamp 1 is energized while the lamps 2 and 3 are energized at a very low level because of the shunt resistors. If a short type failure occurs in lamp 1, either lamp 2 or 3 which is connected in parallel with the larger resistor is energized. If a short type failure occurs with respect to the latter lamp, the third lamp is energized.

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Circuit for Reliability

This circuit redundancy achieves greater reliability. Indicator lamp 1, used as an example, is subject to frequent failures and gives rise to excessive maintenance costs. Three lamps 1, 2 and 3, rather than a single lamp, are connected in series between the terminals of a voltage supply. Resistor 4 is connected in parallel with lamp 2. Resistor 5 is connected in parallel with lamp 3. One of the resistors has a significantly higher value of resistance than the other. Initially, lamp 1 is energized while the lamps 2 and 3 are energized at a very low level because of the shunt resistors. If a short type failure occurs in lamp 1, either lamp 2 or 3 which is connected in parallel with the larger resistor is energized. If a short type failure occurs with respect to the latter lamp, the third lamp is energized. Further, lamps 1, 2 and 3 can be components or other units.

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