Total security time-delay circuit
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United States of America Patent
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-
Dec 17, 1985
Grant Date -
N/A
app pub date -
Mar 28, 1983
filing date -
Apr 2, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A total security time-delay circuit useful in railway communications, for example, provides a series of output pulses after a specific minimum interval in response to a direct voltage applied to an input of the circuit, the minimum interval being maintained even in the event of circuit component malfunctions. A pulse generator connected to the circuit input provides a series of pulses to control a first contact breaker which switches the primary winding of a transformer to partially discharge a capacitor which is series-connected to the primary winding. The capacitor charges through a resistive network of a transformer secondary winding circuit which includes a second contact breaker having a control terminal connected to the transformer secondary winding and operable to provide output pulses when the capacitor discharge reaches a sufficient intensity. A grounded Zener diode connected to a junction of the resistive network and a switch terminal of the second contact breaker ensures that the time delay of the output pulses is not reduced below the minimum interval, even in the event of malfunctions in other circuit components.
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