Switching circuit

Details Switching circuit Switching circuit

1978-09-21

1980-07-01

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307237, 307270, 307315, H03K 1700

Patent

active

042108268

ABSTRACT:
First through fourth NPN switching transistors having bases receptive of first through fourth control signals, respectively, are connected in cascode between a first terminal, for receiving an operating voltage +E.sub.1, and a second terminal for receiving a source of reference potential. The common connection between the second and third transistors is connected to an output terminal. A first diode is connected between a third terminal for receiving a clamping voltage +E.sub.2 and the common connection between the uppermost first and second transistors, the diode being polarized for clamping this common connection from not going lower than +E.sub.2 volts. A second diode is connected between the third terminal and the common connection between the lowermost third and fourth transistors, this second diode being polarized for clamping its associated common connection to a maximum voltage of +E.sub.2 volts. The difference between the operating and clamping voltages (E.sub.1 -E.sub.2) is set to be less than the V.sub.CEX of the four transistors (breakdown voltage from collector to emitter with some backbias voltage on the base), thereby permitting the switching of an operating voltage or load voltages that are substantially greater than the V.sub.CEX rating of the transistors. In one switching state only the second and third transistors are turned on for providing bidirectional current flow between the voltage source of +E.sub.2 volts and a load connected to the output terminal.

REFERENCES:
patent: 3227889 (1966-01-01), Paynter
patent: 3622899 (1971-11-01), Eisenberg
patent: 3710147 (1973-01-01), Lee
patent: 3961280 (1976-01-01), Sample

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