Browse Prior Art Database

Open Drive Line Detector

IP.com Disclosure Number: IPCOM000093602D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Phillips, SA: AUTHOR

Abstract

The apparatus detects either an open circuit or a short circuit and is useful for testing memory drive lines. During the test, a driver is turned on to apply a voltage and a current to the test subject. The apparatus includes transformer 2 with primary windings 3 and 4 and secondary winding 5. Winding 4 is connected to the driver output in circuit with resistor 6 to receive a current that is proportional to the voltage at the input to the load. Winding 3 is coupled by current transformer 7 to receive a current that is proportional to the load current. The two windings are connected in opposite polarity so that their currents oppose. When the load is open-circuited, only the voltage-responsive winding 4 is energized and the flux change associated with this winding produces a voltage across winding 5.

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Open Drive Line Detector

The apparatus detects either an open circuit or a short circuit and is useful for testing memory drive lines. During the test, a driver is turned on to apply a voltage and a current to the test subject. The apparatus includes transformer 2 with primary windings 3 and 4 and secondary winding 5. Winding 4 is connected to the driver output in circuit with resistor 6 to receive a current that is proportional to the voltage at the input to the load. Winding 3 is coupled by current transformer 7 to receive a current that is proportional to the load current. The two windings are connected in opposite polarity so that their currents oppose. When the load is open-circuited, only the voltage-responsive winding 4 is energized and the flux change associated with this winding produces a voltage across winding 5. When the load is short-circuited, only the current responsive winding 3 is energized and a corresponding voltage appears across the winding 3 terminals. The voltage is detected in a fault detector to signify that a fault exists. The polarity of the voltage can be interpreted to signify that the load has either an open circuit or a short circuit.

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