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Transformer Configuration for Generating a Precision Voltage Ratio

IP.com Disclosure Number: IPCOM000092976D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Gasich, DB: AUTHOR

Abstract

In a conventional step-down transformer the ratio of the input voltage to the output voltage is equal to the turns ratio, i. e., E(out)/E(in) = K/N. Therefore in division of a given voltage into increments, the smallest increment available is equal to 1/N. N is the number of turns in the primary of the transformer.

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Transformer Configuration for Generating a Precision Voltage Ratio

In a conventional step-down transformer the ratio of the input voltage to the output voltage is equal to the turns ratio, i. e., E(out)/E(in) = K/N. Therefore in division of a given voltage into increments, the smallest increment available is equal to 1/N. N is the number of turns in the primary of the transformer.

In this transformer configuration, the smallest increment of voltage available is obtainable from the third equation of the drawing by letting K(1) = 0 and K(2) = 1, thus a = 1/N(1) x N2.

The total number of turns required is N = N(1) + N(2) which is smaller than N(1) x N(2). Thus for the same accuracy, the number of turns required is materially reduced over that required in conventional voltage division.

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