Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-05-15
1993-04-27
Arnold, Bruce Y.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307354, 307365, 307359, H03K 5153
Patent
active
052065421
ABSTRACT:
In a comparator according to this invention, a first transistor of a first polarity and a second transistor of a second polarity are connected to each other between a first and second potentials so as to provide positive feedback. The control terminal of a third transistor of the second polarity is connected to one end of the current path of the second transistor and at the midpoint of the positive feed back path between the first and second transistors. A reference voltage is supplied to the base of the first transistor from a voltage dividing resistor circuit that varies the reference voltage according to the conducting state of either the second transistor or the third transistor. The input signal is received at one end of the current path of the first transistor, while the output signal appears at one end of the current path of the third transistor.
REFERENCES:
patent: 3733498 (1973-05-01), Watson
patent: 4115711 (1978-09-01), Moussie
patent: 4385243 (1983-05-01), Suzuki
patent: 4613768 (1986-09-01), Pommer, II
patent: 4701639 (1987-10-01), Stanojevic
patent: 5057709 (1991-10-01), Petty et al.
Arnold Bruce Y.
Kabushiki Kaisha Toshiba
Lester Evelyn A.
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