Protection device

Details Protection device Protection device

2008-01-29

2008-01-29

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

Reexamination Certificate

active

07324315

ABSTRACT:
A protection device is enclosed. The device has a first MOSFET (Q10), a second MOSFET (Q11) and a third JFET (Q12) with their conductive paths in series with the JFET (Q12) being located between the MOSFETS (Q10,Q11). The source of the first MOSFET (Q10) is connected to the gate of the second MOSFET (Q11) and the source of the second MOSFET (Q11) is connected to the gate of the first MOSFET (Q10). The MOSFETS (Q10,Q11) and JFET (Q12) together form a variable resistance circuit block connectable between an input and an output The gate of the JFET (Q12) being coupled to the input and the output by respective current sources.

REFERENCES:
patent: 3603811 (1971-09-01), Day
patent: 4533970 (1985-08-01), Brown
patent: 4744369 (1988-05-01), Kroll
patent: 4811156 (1989-03-01), Kroll
patent: 4868703 (1989-09-01), Borkowicz
patent: 5196980 (1993-03-01), Carson
patent: 5729418 (1998-03-01), Lei
patent: 5742463 (1998-04-01), Harris

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