Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1997-09-26
1998-09-29
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 86, 361 58, 361111, 361118, 361 18, 323276, H02H 320
Patent
active
058153560
ABSTRACT:
Transient protection apparatus and circuitry that allows a circuit being protected to operate during the transient and after the transient. Two types are included, one being a blocking type for use in severe conditions when little is known about the source of the transients and protection must be provided, and the other being a shunt suppresser type for use where the impedance of the transient or other parameters known about the transient allows such use. For the blocking type, when a transient voltage is detected, a series component (Q-1) decouples prevents the transient from reaching the circuit being protected. A charge pump (A-1) is provided that powers the circuit being protected during the duration of the transient. A shunt suppressor type provides a zener threshold (Z1) detector with a power boost provided by a MOSFET or IGBT (Q-30. When low voltage power levels must be protected, a charge pump (4) to bias the gate source of FET's and/or MOSFET's is provided to offset for the gate/source voltage so that output voltages in the 3.5 to 4.5 volt range may be protected.
REFERENCES:
patent: 4536699 (1985-08-01), Baker
patent: 4835649 (1989-05-01), Salerno
patent: 5196980 (1993-03-01), Carson
patent: 5410441 (1995-04-01), Allman
patent: 5517379 (1996-05-01), Williams et al.
Fuchs Gary R.
Rodriguez Edward T.
Gaffin Jeffrey A.
Paul Edwin H.
Power Micro, Inc.
Sherry Michael J.
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