Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-11-07
1981-09-22
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
340 52R, 340 74, 340660, G08B 2100
Patent
active
042913020
ABSTRACT:
A circuit for monitoring the voltage across a sensing resistor in series with a load, wherein two reference currents are generated, each dependent both on temperature and on the voltage on a power supply line, which voltage is also temperature-dependent and exhibits a temperature coefficient of such a sense and magnitude that the changes in a reference current due directly to changes in temperatures are substantially offset by the changes in that reference current due to changes in the voltage on its power supply line, which changes are in turn due to the same changes in temperature. The monitoring circuit also includes a current-repeating circuit which receives one of the reference currents, and provides an output current which is dependent both on the one received reference current, and on the potential difference developed across the series sensing resistor, such that the value of the output current at a predetermined value of the output current at a predetermined value of the potential difference across the sensing resistor is directly related to the value of the one received reference current. The monitoring circuit compares the output current of the current-repeating circuit with the other reference current, and provides an output signal indicating whether the potential difference across the sensing resistor is above or below a predetermined value.
REFERENCES:
patent: 3252157 (1962-04-01), Pabst
patent: 3408625 (1968-10-01), Skinner
patent: 3421157 (1969-01-01), Atkins
patent: 3593264 (1971-07-01), Atkins
patent: 3604949 (1971-09-01), Conzelmann et al.
patent: 3660813 (1972-05-01), Rumpf
patent: 3774188 (1973-11-01), Bial et al.
patent: 4173750 (1979-11-01), Riba
Bial Wolfgang
King Gordon A.
Nimmo George R.
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