Solid state switch with last state memory

Details Solid state switch with last state memory Solid state switch with last state memory

1990-07-13

1992-08-11

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072965, 307584, 307270, 3075421, H03K 1756, H03K 301

Patent

active

051381869

ABSTRACT:
A solid state switch is provided which has the capability of retaining its last state memory in the event of a power failure or interruption. The solid state switch includes an output driver formed of at least one N-channel MOS field-effect transistor, a holding capacitor, a charging resistor, a transistor-connected diode interconnected between a power supply voltage source and the charging resistor for preventing leakage of the holding capacitor. The field-effect transistor has its drain connected to a first output terminal and it source connected to a second output terminal. One end of the holding capacitor is connected to the gate of the field-effect transistor and its other end is connected to a ground potential. The holding capacitor retains the last state between the first and second output terminals in the event of a loss of the power supply voltage source.

REFERENCES:
patent: 4035668 (1977-07-01), Minami et al.
patent: 4521693 (1985-06-01), Johnson
patent: 4530027 (1985-07-01), Berger
patent: 4639614 (1987-01-01), Basile
patent: 4649302 (1987-03-01), Damiano et al.
patent: 4851721 (1989-07-01), Okitaka
patent: 4859875 (1989-08-01), Tihanyi et al.
patent: 5003192 (1991-03-01), Beigel

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