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Dual Voltage Regulator

IP.com Disclosure Number: IPCOM000051354D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Kozak, H: AUTHOR

Abstract

Different regulated voltages can be dynamically obtained from a regulat circuit by selectively controlling the feedback control voltage.

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Dual Voltage Regulator

Different regulated voltages can be dynamically obtained from a regulat circuit by selectively controlling the feedback control voltage.

Referring to the figure, a first output voltage at Vo is developed by comparing a reference voltage Vin with a feedback voltage Vfb at voltage regulator (Type 723) 11. The feedback voltage is obtained from potentiometer 12 in a voltage divider network comprising resistors 13, 14 and potentiometer 12. The output voltage from the voltage regulator 11 controls the base voltage of transistor 15 which in turn varies the input base voltage to Darlington power transistor pair 16. Resistors 17-21 in conjunction with transistors 15 and 16 comprise the predrive and drive circuits and modify the gain of the regulator for added stability. V1 and V2 are different supply voltages, with V2 being the greater.

A second regulated voltage is obtained through the circuit of resistors 22-24, transistors 25, 26, diode 27 and potentiometer 28. The second voltage is developed as a replacement for the first voltage when a positive input signal is applied at V3, causing transistors 25 26 to turn on. This in turn produces a positive voltage, as determined by potentiometer 28, to occur on the feedback line. This voltage is more positive than the feedback voltage developed originally at output Vo so that a large error voltage exists at the input of voltage regulator
11. As a result, the output voltage Vo falls at a rate determined by...