Voltage transient protection circuit

Details Voltage transient protection circuit Voltage transient protection circuit

1982-12-27

1985-01-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 18, 361101, 361111, 323277, H02H 320

Patent

active

044955367

ABSTRACT:
A three terminal integrated low-resistant series switch circuit which buffers load electronics from extreme input voltage conditions. The circuit comprises a series pass transistor the conductivity of which is controlled by control circuitry in cooperation with feedback control. In response to the input exceeding a predetermined operating potential the series pass transistor is driven toward saturation and is maintained in this state by feedback whereby only that load current required by the load electronics is supplied for increased efficiency. The control circuitry is responsive to the signal at the input thereof exceeding a predetermined level for rendering the series pass transistor nonconducting to protect the load electronics from extreme voltage excursions. A feature of the circuit is that the epitaxial layer within which the control circuit is formed is operated at a lower voltage than that of the substrate.

REFERENCES:
patent: 4254372 (1981-03-01), Moore, Jr.
patent: 4319179 (1982-03-01), Jett, Jr.
patent: 4319181 (1982-03-01), Wrathall

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