Browse Prior Art Database

Dual Voltage, Opposite Tracking Regulator

IP.com Disclosure Number: IPCOM000076293D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Feebeck, WH: AUTHOR [+3]

Abstract

Shown is a dual-voltage regulator having regulated output voltages V1 and V2, and wherein V2 track variations in V1 are in the opposite direction. In other words, a positive incremental change in V1 will cause a negative incremental change in V2.

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Dual Voltage, Opposite Tracking Regulator

Shown is a dual-voltage regulator having regulated output voltages V1 and V2, and wherein V2 track variations in V1 are in the opposite direction. In other words, a positive incremental change in V1 will cause a negative incremental change in V2.

In operation, relatively unregulated voltage is applied at terminal 10 to provide the power to operate the voltage regulator. Zener diode 1 provides a substantially fixed reference voltage -VR at the positive input to operational amplifier 14. Operational amplifier 14 will drive transistor 16 until the voltage at node 18 matches -VR. Thus, the voltage V1 is given by the expression at output node 20. Resistor 22 merely represents a load.

The second regulated voltage V2 is derived from V1 by operational amplifier 24 driving transistor 26. Amplifier 24 will drive transistor 26 until a voltage dividing action across resistors R3, R4 at node 28 causes node 28 to reach zero potential. The output characteristic for this amplifying stage is given by the expression for V2 at node 30. Resistor 32 represents a load.

Because the gain of the second amplifying stage is -R4/R3, voltage V2 will track variations in V1 but will move in the opposite direction.

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