Protection circuit for detachable operating unit used in audio d

Details Protection circuit for detachable operating unit used in audio d Protection circuit for detachable operating unit used in audio d

1992-03-25

1993-01-12

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 82, 361 84, 307127, H02H 324

Patent

active

051794926

ABSTRACT:
A detachable operating unit for connection with a main unit comprises at least two power supply units for applying operating voltages to the detachable operating unit, the power supply units generating two different voltages, respectively; at least two power supply terminals for engaging the detachable operating unit and the main unit to receive two different voltages applied to the power supply units, respectively; a ground terminal for engaging the detachable operating unit and the main unit; a protective circuit for applying a reverse voltage in repsonse to a differential voltage between voltages of the power supply units, the protective circuit being disposed between one of power supply units which generates the operating voltage lower than that of the other power supply unit, and the ground terminal.

REFERENCES:
patent: 3614531 (1971-10-01), Oswald
patent: 3940785 (1976-02-01), Genesi
patent: 4037265 (1977-07-01), Smith
patent: 4492878 (1985-01-01), Hamel
patent: 4843515 (1989-06-01), Richman
patent: 4945444 (1990-07-01), Schwertlein et al.
patent: 4958251 (1990-09-01), Cini et al.
patent: 4979071 (1990-12-01), Ito et al.
patent: 5012381 (1991-04-01), Elliot et al.
EDN Electrical Design News. vol. 29, No. 2, Jan. 1984, Boston, Mass., pp. 137-152; Paul Mannone: "Careful design methods prevent CMOS latch-up".

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