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Detecting Shorted Circuits on Ohmic-Connected Buses

IP.com Disclosure Number: IPCOM000041817D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Fickle, DM: AUTHOR

Abstract

A plurality of semiconductor circuits are ohmically connected in parallel to a microprocessor or other controller via a single wire termed a "bus". If any of the circuits connected to the bus have a short circuit, then the entire becomes inoperative because of the short circuit. This problem is eased by providing a fusing element in each of the circuits connected to the bus. When the controlling unit detects a short-circuit condition on the bus, a pulser provides a monetary surge of current which is greater than that required for the operation of the circuits for opening the fuse element at the short circuit. The internal impedance of the other circuit limits the current surges through the other fuse elements for preventing openings.

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Detecting Shorted Circuits on Ohmic-Connected Buses

A plurality of semiconductor circuits are ohmically connected in parallel to a microprocessor or other controller via a single wire termed a "bus". If any of the circuits connected to the bus have a short circuit, then the entire becomes inoperative because of the short circuit. This problem is eased by providing a fusing element in each of the circuits connected to the bus. When the controlling unit detects a short-circuit condition on the bus, a pulser provides a monetary surge of current which is greater than that required for the operation of the circuits for opening the fuse element at the short circuit. The internal impedance of the other circuit limits the current surges through the other fuse elements for preventing openings. Upon completion of the pulsing, the controlling unit senses for an open circuit and then identifies the circuit in error for replacement. The drawing shows three circuits ohmically connected via a single wire or bus to a microprocessor which controls the three circuits. Each of the circuits has a fused element which can be merely a reduced cross-sectional helmet of a printed circuit on a semiconductor chip. Separate fuses may also be provided for the individual circuits. The methodology for detecting the illustrated short circuit on the circuit side of fuse "B" is that the microprocessor first detects the short on the bus. Secondly, the microprocessor activates the fuse-opening circ...