专利名称：METHOD AND CIRCUIT FOR MONITORING
A DEFINED AMPLITUDE THRESHOLD VALUEOF SIGNALS FORMED BY ALTERNATINGVOLTAGE
发明人：CULCA, HOREA-STEFAN申请号：EP98961012.0申请日：19981016公开号：EP0935758A1公开日：19990818
摘要：A method for monitoring a defined amplitude threshold value of a signalformed by alternating voltage and a circuit for carrying out such a method. The methodincludes (a) eliminating a negative input signal half-wave (b) stepping down the residualpositive input signal half-wave, (c) testing whether the value of the stepped down inputsignal half-wave is above or below the threshold value and generating a first binary signalaccording to the testing, (d) monitoring, said monitoring being carried out simultaneouslyto steps (a) to (c), of the zero crossing of a reference signal formed by alternatingvoltage and generating a second binary signal according to the monitoring, (e)
generating a third signal by delaying the second signal at a defined delay time such that astate change of the third signal results at the time of the respective vertex of the positiveinput signal half-wave, and (f) deciding whether the value of the positive input signal half-wave is above or below the threshold value, whereby a fourth binary signal is generatedby evaluating the first signal at the time of the state change of the third signal.
申请人：KLOECKNER-MOELLER GMBH
地址：Hein-Moeller-Strasse 7-11 53115 Bonn DE
国籍：DE
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