Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2006-06-13
2006-06-13
Vu, Phuong T. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C361S101000, C361S103000, C327S143000, C326S112000
Reexamination Certificate
active
07061740
ABSTRACT:
A system and method for protecting an output transistor in an audio amplifier output stage includes a protection circuit that protects the output transistor from excessive currents and voltages, and does not interfere with the normal operation of the output transistor. The protection circuit generates an estimate of the power dissipated by the output transistor, applies this estimate to an electrical analog of the thermal time constants of the transistor to obtain an estimate of the temperature differential between junction and case, compares this differential to a limit, which is a function of transistor case temperature.
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Beavers Lucian Wayne
Gibson Guitar Corp.
Vu Phuong T.
Waddey & Patterson , P.C.
Willoughby Terrence
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