Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-11-17
1998-08-04
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327108, 327309, 327546, G05F 110
Patent
active
057899711
ABSTRACT:
A protection circuit for at least one power transistor which has at least one control terminal and two main conduction terminals defining a main conduction path includes a first detection means designed to generate a first electrical signal approximately proportional to current flowing in the main conduction path. Second detection means are designed to generate a second electrical signal approximately proportional to voltage across the main conduction path. Multiplying means receive at input the first and second signals and are designed to generate an electrical product signal substantially corresponding to the product of at least the latter. A generator generates an electrical reference signal, and operational amplifier means receive at input the product signal and the reference signal and are designed to generate an electrical difference signal substantially corresponding to their difference. Control means are designed to drive the control terminal on the basis of the difference signal so that the product signal is not greater than the reference signal.
REFERENCES:
patent: 4021701 (1977-05-01), Davies
patent: 4646219 (1987-02-01), Rohl
patent: 4972136 (1990-11-01), Banura
patent: 5008586 (1991-04-01), Miyazaki et al.
patent: 5504452 (1996-04-01), Takenaka
patent: 5570060 (1996-10-01), Edwards
Bontempo Gregorio
Colletti Paolo
Gariboldi Roberto
Pulvirenti Francesco
Carlson David V.
Co.Ri.M.Me.-Consorzio per la Ricerca sulla Microeletrronica nel
SGS--Thomson Microelectronics S.r.l.
Wambach Margaret Rose
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