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Voltage Regulator with Fuseless High Speed Shut Off

IP.com Disclosure Number: IPCOM000095669D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Thomas, E: AUTHOR

Abstract

The bias circuits of two series voltage regulators are cross-coupled for automatically disconnecting an unregulated power source from a load that is drawing excessive current or voltage.

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Voltage Regulator with Fuseless High Speed Shut Off

The bias circuits of two series voltage regulators are cross-coupled for automatically disconnecting an unregulated power source from a load that is drawing excessive current or voltage.

Series regulator s 10 and 11 respectively provide bias power and main power regulation. Initial unregulated input potential at terminals 14 and 15 results in no output voltage from either regulator, since no base-emitter potential is applied to any transistors. Closure of switch 16 energizes 11 by providing base-emitter voltage for transistors 17, 18 and 19 and differential amplifier transistors 20 and
21. Operation of 11 in turn provides energizing bias for 22 by the interconnection through potentiometer 23. Release of 16 to its normally open position permits normal regulation for load 25 and any light load connected across 10.

If a short-circuit appears across output terminals 24, the base-emitter potential for 22 is removed, turning 22 off thus removing operating potential from 1 1 which stops conducting. A short at the output of 10 has a similar effect. In both situations, no output current is produced by either regulator until 16 is reset.

Overvoltage and overcurrent sensing circuit 12 is interposed between 25 and
11. In the event 25 draws excessive current, SCR 27 is gated on by series resistor 28 and presents a short-circuit across terminals 24. If the voltage across 25 rises above a minimum set at 29, transistor 30 sense...