Zener referenced threshold detector with hysteresis

Details Zener referenced threshold detector with hysteresis Zener referenced threshold detector with hysteresis

1984-01-16

1985-06-25

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307363, 307359, 307299B, 307318, H03K 5153

Patent

active

045256381

ABSTRACT:
In a zener referenced voltage threshold detector, the voltage at which a switching transistor turns on is determined by the breakdown voltage of a zener diode coupled between ground and the base of the switching transistor in conjunction with the base-emitter voltage of the switching transistor itself. In order to render the threshold detector circuit immune from noise at the trip point, a portion of the switching transistor's collector current is supplied to a second transistor which when turned on reduces the voltage at the base of the switching transistor.

REFERENCES:
patent: 3586879 (1971-06-01), Ford
patent: 4258277 (1981-03-01), Nutz
patent: 4385243 (1983-05-01), Suzuki

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