Dual threshold sensitive transistor turn-off circuit

Details Dual threshold sensitive transistor turn-off circuit Dual threshold sensitive transistor turn-off circuit

1985-05-28

1988-06-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307315, 307317A, 307296R, H03K 301, H03K 1756, H03K 333

Patent

active

047541580

ABSTRACT:
A DC coupled transistor turn-off circuit (12) responsive to a first DC voltage level for reverse driving the base of an output transistor (Q4), and responsive to a second DC voltage level for removing the reverse base drive. A turn-off transistor (Q5) is connected to the base (22) of the output transistor (Q4) for reverse driving it, and another transistor (Q6) is connected to the turn-off transistor (Q5) for turning it off. A pair of diodes (32, 34), each with different forward voltage drops, are connected between the respective bases of the turn-off circuit transistors (Q5, Q6) and a circuit input node (16). When the rising edge of the input voltage at such node reaches the first DC level, the first diode (32) conducts and activates the turn-off transistor (Q5) which reverse drives the base of the output transistor (Q4). On reaching a second higher DC voltage on the rising circuit node voltage, the second diode (34) conducts and turns off the turn-off transistor (Q5), thus removing the reverse drive of the output transistor (Q4).

REFERENCES:
patent: 3831102 (1974-08-01), Medal
patent: 3959665 (1976-05-01), Gilbreath et al.
patent: 4132906 (1979-01-01), Allen
patent: 4318011 (1982-03-01), Zeis
patent: 4491744 (1985-01-01), Corey

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