Jump to content
ELFORUM - Forumul electronistilor
Dudikoff

Cum se masoara tensiunea alternativa ?

Recommended Posts

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.

Link to comment
Share on other sites

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

 

post-175886-0-55509100-1492092443_thumb.png

 

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...

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.Terms of Use si Guidelines