Current steering circuit.

摘要

A current steering circuit for comparing the outputs of two channels of a parallel redundant control system. The voltages and senses of the outputs are mirror-images and are fed into opposite ends (A;B) of four terminal resistor network, of two bias arms (R) and two input arms (R), at the centre junction of which is a light emitting diode (D). One of the bias arms contains oscillating switch means (S) which causes the diode (D) bias voltage to oscillate. When the input voltage at the diode cathode is high the diode will emit light and the voltage at the diode anode will oscillate across a predetermined threshold voltage only when the inputs agree. Two or more circuits can be connected together to compare the outputs of several parallel redundant channel.