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Diode Device for Line Status Detection

IP.com Disclosure Number: IPCOM000095128D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Canard, G: AUTHOR

Abstract

It is often necessary to determine whether or not a current is flowing through a core or to know if such current is above or below some reference value. The circuitry is for DC current detection through a conductor.

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Diode Device for Line Status Detection

It is often necessary to determine whether or not a current is flowing through a core or to know if such current is above or below some reference value. The circuitry is for DC current detection through a conductor.

Being given the diode characteristic, the same voltage drop yields or has a tendency to yield much different signal current i variations. Such depend on the operating point on the characteristic.

Thus, as long as the operating current 1 is such that the operating point lies on the sloping part of the characteristic, direct or indirect measurement of signal current i enables determination of the operating point. From this, the DC current I flowing through the diode can be found.

In the functional equivalent circuit of drawing 1, there is DC current circuit phi and signal current circuit. The latter comprises generator G, diode D, resistors R2 and R3. Choke M is an open circuit for the generator G signal. When variable load Ch is high, current I is low, the diode D forward resistance R is high and equals R0. The signal voltage collected through N across the terminals of resistor R3 and detected by X is then V' = VR3/(R3 + R2+ R0).

When Ch is low, current 1 gets more substantial and diode resistance R becomes smaller. The signal circuit is the same as in the preceding case but with a new value for R which is equal, here, to R1. The voltage collected across R3 is V'' = V x R3/(R3 + R2 + R1).

In drawing 2, there is ap...