Voltage shock protection circuit

Details Voltage shock protection circuit Voltage shock protection circuit

1987-10-15

1988-09-20

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 91, 361 92, 361101, H02H 320, H02H 324

Patent

active

047729791

ABSTRACT:
A voltage shock protection circuit having two anti series connected field effect transistors adapted for being connected between a conductor and a protected circuit for connecting the protected circuit to the conductor and also protecting the protected circuit against voltage transients possibly occurring in the conductor, the voltage transients having excessively high or low potentials that could damage the protected circuit. The voltage shock protection circuit has a voltage sensing circuit connected to the protected circuit and to the conductor so that it is sensitive to voltage drops across each of the anti series connected field effect transistors and adapted such that when either of the voltage drops becomes sufficiently great one of the field effect transistors is pinched off. The voltage sensing circuit may include a field effect transistor. The two anti series connected field effect transistors and/or the field effect transistor in the voltage sensing circuit are dimensioned such that in their conductive state they become saturated on the occurrence of a voltage transient with a damaging potential.

REFERENCES:
patent: 3603811 (1971-09-01), Day
patent: 3656025 (1972-04-01), Roueti
patent: 3986060 (1976-10-01), Nishizawa et al.
patent: 4686383 (1987-08-01), Croft

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