Electronic comparator of two binary words with failure safety directed output behavior

摘要

Electronic comparator of two binary words with failure safety directed output behavior for use in automation systems which are responsible for safety, whereby firstly a two-channel digital preprocessing unit (1) the two binary words applied to the input in parallel with one another, wherein the of the two channels of the preprocessing unit which is generated as a results a - bits - digital signals (q1, q2) via gates (optocoupler u1 and u2 in 2) by means of injection of energy from the comparator output (cf.) of a failure safety directed, galvanically separated are fed to analog comparator circuit (2), in the by means of a first (tr1) and a second transformer (tr2) pulses are generated, which in the case of identical q1 and q2 occur simultaneously and the two transistors (t5, t6) can be conductive for a brief period of time, as a result of oscillations in a series circuit consisting of a capacitor (c1) and a third transformer (tr3) which are initiated which subsequently amplified (t9, t10, t13) via a further transformer (tr6) a rectifier (gl3) are supplied to, whose output signal (cf.) the result of the comparison, wherein the comparator after the detection of any differences in which a - bits - digital signals (q1,..