Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1977-03-11
1978-09-26
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
328 3, 307246, 307273, H03K 1714
Patent
active
041173554
ABSTRACT:
To obtain input signals as a function of various types of input signals, R/C circuits are used to charge or discharge a capacitor, the charge state of which is sensed by a threshold stage. To render such circuits essentially independent of temperature changes, in spite of different response levels of the R/C circuit and the threshold stage, a second R/C circuit and threshold stage are connected in parallel with the first, one threshold stage being responsive to charging direction of the capacitor, the other threshold stage being responsive to discharging direction of the capacitor, and the overall output signal being a combination of the output signal from both threshold stages so that increase of the signal components of the combined output signal from one threshold stage, due to temperature increase, for example, will be balanced by a decrease of the signal component from the other threshold stage, thereby rendering the overall output essentially temperature independent.
REFERENCES:
patent: 3571732 (1971-03-01), Richardson
patent: 3573495 (1971-04-01), Xylander
patent: 3764927 (1973-10-01), Allinger
Heyman John S.
Robert & Bosch GmbH
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