Method and circuitry of amplifying the input signals of an electronic trip unit in a low-voltage circuit breaker

摘要

method and schaltungsanordnung to reinforce the input signals (e) of an electronic u00fcberstromauslu00f6sers of low-voltage circuit breakers.;the invention concerns a method and a schaltungsanordnung to reinforce the input signals (e) of an electronic u00fcberstromauslu00f6sers of low-voltage circuit breakers with several operationsverstu00e4rkern (op1, opn) different verstu00e4rkungsgrades and amounting to a reference voltage limited aussteuerungsgrad,the outputs of each optional depending on the output level of operational amplifiers on the auslu00f6seeinheit (m) of the u00fcberstromauslu00f6sers is switched.;it is proposed that the inputs of all other operational amplifiers according to the potential of a voltage source (uref / 2) to be switched.;high eingangspegel to the operationsverstu00e4rkern (op1...opn) can thus be immediately suppressed and recovery time shortened.