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Protective Gating for Pulse Devices

IP.com Disclosure Number: IPCOM000093888D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hilsenrath, M: AUTHOR [+2]

Abstract

This circuit prevents, for a predetermined time duration, overlapping of pulses generated in response to random commands. The commands appear as closures of switch 1, causing point A to drop from 24 volts to 12 volts. The resulting current through transistor T2 causes a drop in voltage at point B. The negative pulse at B is coupled through capacitor C3 and resistor R4 to the input of the single- shot SS5. The output of SS5 is a pulse of predetermined duration which biases transistor T6 into conduction to draw current through load 7.

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Protective Gating for Pulse Devices

This circuit prevents, for a predetermined time duration, overlapping of pulses generated in response to random commands. The commands appear as closures of switch 1, causing point A to drop from 24 volts to 12 volts. The resulting current through transistor T2 causes a drop in voltage at point B. The negative pulse at B is coupled through capacitor C3 and resistor R4 to the input of the single- shot SS5. The output of SS5 is a pulse of predetermined duration which biases transistor T6 into conduction to draw current through load 7.

When T6 is saturated, resistor R8 applies a voltage to the base of transistor 9 which cuts it off. When SS5 time s out, T6 is cut off to provide a voltage at the base of T9 which drives it to saturation. The drop in voltage at the collector of T9 is coupled to point C by capacitor C10, biasing T2 off. With point C at any value less than about 12 volts, T2 does not conduct even though switch 1 is closed, thus preventing a subsequent closure of switch 1 from triggering SS5.

The voltage at point C gradually rises in response to charging current through resistor R12. After a period of time, determined by the time constant of R12 and C10, point C reaches the threshold of about 12 volts which allows a closure of switch 1 to initiate another operation.

The time constant of C10 and R12 is selected to provide the desired interval between successive pulse outputs from SS5. Succeeding closures of switch 1 with...