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ELFORUM - Forumul electronistilor

Cum se masoara tensiunea alternativa ?

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As vrea sa masor tensiunea de la iesirea unui traf. Ca sa pot sa o masor (cu un ADC) trebuie sa transform acel sinus intr-o tensiune DC care sa reprezinte valoarea RMS, AVG, sau Peak (nu conteaza care) a sinusului, iar asta nustiu cum sa fac. Daca o redresez si o filtrez obtin valoarea Peak dar daca tensiunea alternativa scade, tensiunea redresata nu o urmareste din cauza ca ramane codul incarcat. Stiu, o sa ziceti "pune o rezistenta in paralel cu condul", dar nu e acceptabil, daca rezistenta e prea mica face riplu mare iar daca e prea mare se descarca prea incet.

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Am facut asa, dar nu sint sigur de o chestie.




Cu tensiune maxima la intrare (100V peak) am pe intrarea inversoare a primului opamp tensiune pana la 8V (ce se vede cu albastru), iar integratul e alimentat la 5V. Eu nu ma pricep daca asta e in regula sau nu...

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