Extended range current-to-time converter

Details Extended range current-to-time converter Extended range current-to-time converter

1977-03-21

1978-08-01

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, 307293, 307296A, 354 51, 354 60R, H03K 5153, H03K 520

Patent

active

041045475

ABSTRACT:
An improved comparator circuit is employed to respond to the charge on a capacitor which represents the integrated value of an input current. When the charge exceeds the comparator trip point, an output is generated. The output is delayed in time from the onset of the input current by an amount that is almost exactly linearly proportional to the current magnitude. The improvement comprises a circuit that senses the onset of comparator conduction and supplies the current necessary to operate the comparator. At very low input current values a condition can be reached where the current drawn by the comparator input equals or exceeds the applied current. For this condition an ordinary comparator will never trip. The improved circuit prevents this and, since the current added is only to compensate, the timing function is not seriously perturbed.

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