Programmable inverse time delay circuit

Details Programmable inverse time delay circuit Programmable inverse time delay circuit

1990-07-18

1991-12-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307597, 307608, 340662, 361 79, 361 89, 361 91, H03K 524, H03K 1708, H03K 1728

Patent

active

050737244

ABSTRACT:
An inverse time delay circuit includes an integrator for receiving a signal representative of a voltage or current in an external circuit and a reference signal. The integrator produces a control signal representative of the integral of the difference between the signals. A comparator compares the control signal to a second reference signal to produce an output which changes logic states when the magnitude of the control signals exceeds the magnitude of the second reference signal. A circuit is provided to control the magnitudes of one or both of the reference signals thereby providing control of the instantaneous and/or ultimate trip levels of the circuit.

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