Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1995-06-05
1997-04-01
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361 91, H02H 100
Patent
active
056172885
ABSTRACT:
A surge suppressor disconnect protection circuit is coupled to a first surge suppressor electrically coupled to the terminals of an AC source to protect the first surge suppressor from predetermined overvoltages. The circuit includes a relay switch connected in series with the first surge connected to the AC source terminals for rectifying the AC to generate a DC signal. The adjuster filters the DC signal and scales the filtered DC signal. An amplifier is electrically coupled to the adjuster and to and providing a difference signal integrator time constant is electrically connected to the amplifier and produces a signal which is proportional to a length of time the scaled DC signal is greater than the first voltage reference. A comparator is connected to a second voltage reference. The comparator output is electrically coupled to the relay switch which opens the switch contact to set it to a high impedance state when the integrator output signal exceeds the second voltage reference.
REFERENCES:
patent: 4174529 (1979-11-01), Hamann
patent: 4636910 (1987-01-01), Chadwick
Gaffin Jeffrey A.
Leviton Manufacturing Co., In.
Medley Sally
Sutton Paul J.
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