Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1993-04-08
1997-04-29
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 54, H02H 300
Patent
active
056255195
ABSTRACT:
A circuit protection arrangement comprises a series switching circuit that is intended to be connected in a line of the circuit and will switch to an open state when subjected to an overcurrent, and a shunt switching circuit that is open under normal operating conditions but will shunt the overcurrent across the load of the circuit or to ground when triggered by the series switching circuit. Preferably the series switching circuit comprises a switching transistor (4) that is controlled by a control transistor (6), and the shunt switching circuit comprises a shunt switching transistor (9) that is controlled by a shunt control transistor (11) which is itself controlled by the series switching circuit. The shunt switching circuit may be connected to ground or it may be connected to a back-up load or voltage foldback device such as a triac.
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Bertram Bruce M.
Burkard Herbert G.
Gaffin Jeffrey A.
Gerstner Marguerite E.
Medley Sally C.
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