Timing unit

Details Timing unit Timing unit

1977-04-20

1978-11-21

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307225R, 307353, 307362, 307246, 307282, 307227, H03K 5153

Patent

active

041267958

ABSTRACT:
A fail-safe long interval timer has a capacitor which is charged progressively and the voltage across which is sampled momentarily at intervals, without fully discharging the capacitor, by connecting a pulse transformer across the capacitor for the duration of very short pulses which act on a solid state switching element. When the sampled pulses reach a threshold amplitude level a threshold device is triggered, after a time interval which will be determined by the charging circuit and the capacitor as well as the characteristics of the sampling circuit.

REFERENCES:
patent: 2933689 (1960-04-01), Johnson
patent: 3121803 (1964-02-01), Watters
patent: 3139532 (1964-06-01), Hjermstad
patent: 3139532 (1964-06-01), Hjermstad
patent: 3597601 (1971-08-01), Bahring
patent: 3819955 (1974-06-01), Hilbert
patent: 3968447 (1976-07-01), Baylac et al.

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