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d.c. series transistor voltage regulator

IP.com Disclosure Number: IPCOM000098255D
Original Publication Date: 1960-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

O'Malley, FL: AUTHOR

Abstract

The D. C. voltage regulator is adaptable for use in a wide range of voltage applications by proper selection of a single resistor R10.

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d.c. series transistor voltage regulator

The D. C. voltage regulator is adaptable for use in a wide range of voltage applications by proper selection of a single resistor R10.

The series and driver transistors Q1 and Q2 are controlled by the error amplifiers Q3 and Q4. The voltage developed across CR1 establishes the reference level for the emitters of Q3 and Q4. The value of R10 is selected, according to the desired output voltage level, to set the base-to-emitter bias of Q4 at its operational midpoint. Fine adjustment of output voltage is set by adjusting R1.

Error signals developed across R5 and R10 control the collector current of Q4 which regulates the output of Q3 to the driver Q2, by control of both base bias through R3 and emitter current through constant current source R4. Regenerative and instability tendencies are damped out by C2 in the base circuit of Q3.

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