Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1994-06-27
1996-11-26
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 90, H02H 318
Patent
active
055791964
ABSTRACT:
A protection circuit (1) comprising a first and second supply line at a first and second supply voltage respectively; a reference voltage source; a comparator connected to the first supply line and the source; and a switch controlled by the comparator via a control terminal and located between the second supply line and the output of the circuit. To reduce static consumption of the comparator under normal operating conditions, the circuit comprises enabling control elements connected to the two supply lines and to the comparator for disabling the comparator and turning on the switch when the two supply voltages differ by a value below a predetermined threshold, but are greater than a reference value.
REFERENCES:
patent: 4975878 (1990-12-01), Boddu et al.
patent: 4975883 (1990-12-01), Baker et al.
patent: 5199032 (1993-03-01), Sparks et al.
patent: 5371709 (1994-12-01), Fisher et al.
European Search Report No. EP 93 83 0279 and Annex to the European Search Report Nov. 25, 1993.
Carlson David V.
Gaffin Jeffrey A.
Jackson Stephen W.
SGS--Thomson Microelectronics S.r.l.
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