Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1989-10-25
1991-05-14
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307309, 328 5, H03K 5153
Patent
active
050158783
ABSTRACT:
The circuit comprises a first threshold comparator (2,3) with hysteresis which is arranged to provide a reference signal (V.sub.c) indicative of the zero-crossing of the sensor signal (V.sub.p). Also connected to the sensor (P) is an integrator circuit (4) whose output is connected to the input of a second threshold comparator (7). The latter provides an inabling output signal (V.sub.e) only when the integrated signal (V.sub.i) exceeds a reference signal (V.sub.2) whose amplitude varies in a predetermined manner in dependance on the amplitude of the integrated signal (V.sub.i). An inabling circuit (14) is connected to the two threshold comparators (2,3;7) and outputs the signal (V.sub.c) generated by the first comparator (2,3) only when the second comparator (7) emits an enabling output signal (V.sub.e).
REFERENCES:
patent: 3944936 (1976-03-01), Pryor
patent: 3991733 (1976-11-01), Harris
patent: 4267470 (1981-05-01), Kawakami et al.
patent: 4429235 (1984-01-01), Minner
patent: 4687952 (1987-08-01), Capizzi, Jr.
patent: 4922757 (1990-05-01), Rozelle et al.
Lasagna Diego
Mandara Francesco P.
Marelli Autronica S.p.A.
Zazworsky John
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