Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-10-22
1999-08-17
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340662, 340664, 335 17, 361 86, G08B 2100
Patent
active
059399910
ABSTRACT:
A circuit breaker has line and load terminals and a mechanism which indicates the magnitude of current flowing through the circuit breaker. The mechanism includes a current sensing resistor coupled between the supply and load terminals. An amplifier is coupled to the current sensing resistor and produces a first output signal corresponding to the current magnitude. A first light emitting diode is energized by the first output signal. A first comparator is coupled to the amplifier and produces illumination of a second light emitting diode when the first output signal exceeds a first reference voltage level. A third light emitting diode is illuminated by a second comparator when the first output signal exceeds a second reference voltage level. Thus the number of light emitting diodes that are illuminated indicates the relative level of current conducted by the circuit breaker.
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Article entitled "High-side Current Sense Causes Little Error" by Charles L. Langner, p. 41 EDN Design Ideas, date unknown, admitted prior art.
Eaton Corporation
Hofsass Jeffery A.
Woods Davetta
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