Circuit for detecting current variations
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United States of America Patent
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-
Mar 15, 1988
Issued Date -
N/A
app pub date -
Mar 24, 1987
filing date -
Jun 20, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The circuit of the present invention detects variations of a current I.sub.L flowing in a telephone line LL. A low-value resistor r is connected in series with line LL. A constant voltage generator is connected across this resistor. The current Is applied to resistor r by the contant voltage generator varies as a function of I.sub.L. This being so, a measurement of the variations of Is will reflect variations of I.sub.L and, therefore, can be used to detect both amplitude and directional variations of I.sub.L.
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