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Transistor Regulator

IP.com Disclosure Number: IPCOM000096943D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Ferraiolo, FA: AUTHOR [+2]

Abstract

In this series transistor regulator circuit, the output voltage tends to increase as the output current increases. This effect is the opposite of that achieved by the usual circuit.

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Transistor Regulator

In this series transistor regulator circuit, the output voltage tends to increase as the output current increases. This effect is the opposite of that achieved by the usual circuit.

Transistor T1 has its emitter-collector path connected in series between a nonregulated supply and a load circuit. T2 is a driver stage for T1. T2 is coupled by amplifying stage T3 to a load sensing circuit including the resistors R2, R3 and R4 and diode D2. The sensing circuit is connected across the regulator output to sense fluctuations which occur in output current. The circuit has a reference circuit, including Zener diode D1 and current limiting resistor R1, connected in the base circuit of T1. It is this connection which achieves the primary objective, namely, the increase of output voltage with increase of output current.

As the output current increases, the emitter to base voltage drop of T1 also increases, causing the voltage applied to R1 and D1 to increase. The reference voltage across D1 also increases due to the dynamic resistance of D1. T2 drives T1 to a greater extent causing the output voltage to increase. Temperature compensation is also provided by this connection of the reference circuit. Since the emitter to base voltage drop of T1 decreases as temperature increases, the voltage across R1 and D1 decreases. This decreases the reference voltage and, therefore, reduces the output voltage as temperature increases.

The circuit also includes resisto...