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Low Voltage Regulated Power Supply

IP.com Disclosure Number: IPCOM000095566D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Lang, PC: AUTHOR

Abstract

Variations of reference voltage diode characteristics, particularly with temperature changes, adversely affecting the operation of a very low voltage regulated power supply are obviated with this dynamic circuit.

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Low Voltage Regulated Power Supply

Variations of reference voltage diode characteristics, particularly with temperature changes, adversely affecting the operation of a very low voltage regulated power supply are obviated with this dynamic circuit.

The regulator circuit has a series regulating transistor T1, a driver transistor T2, and a two-stage high gain differential amplifier circuit comprising amplifying transistors T3... T6. Variations in output voltage are sensed in the circuit comprising the potentiometer P1 and applied to T6. A reference voltage is developed across zener diode D1 and applied to T5.

Variations in the characteristics of D1 are compensated by a low loop gain amplifier circuit having a control transistor T7. The changes in output voltage brought about by ineffective operation of the reference diode are sensed in the circuit comprising the potentiometer P2. The current flowing through the reference diode D2 is varied inversely to bring the reference voltage back to the required value. Diode D2 is included to provide temperature compensation for T7.

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