{"id":62,"date":"2016-06-06T10:18:26","date_gmt":"2016-06-06T12:18:26","guid":{"rendered":"http:\/\/vejas.defas.lt\/?p=62"},"modified":"2016-07-27T04:52:51","modified_gmt":"2016-07-27T06:52:51","slug":"itampos-matavimo-adapteris","status":"publish","type":"post","link":"http:\/\/vejas.defas.lt\/?p=62","title":{"rendered":"\u012etampos matavimo adapteris"},"content":{"rendered":"<p>U\u017eduotis: sukonstruoti galvani\u0161kai izoliuot\u0105 matuokl\u012f, matuojant\u012f 0-1000V diapazono \u012ftamp\u0105, su 0,1V paklaida. Tikslumas gaunasi 10000 padal\u0173. 16 bit\u0173 keitiklis tur\u0117s 2^16=65536 padal\u0173. Srov\u0117s matavimo riba tur\u0117t\u0173 siekti 50A.<\/p>\n<p><a href=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/Printing-Preview.pdf\">Primesta schema:<\/a><\/p>\n<p>Panaudosime srov\u0117s matavimo element\u0105:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-71\" src=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/T60404-N4644-X400-300x290.jpg\" alt=\"T60404-N4644-X400\" width=\"300\" height=\"290\" srcset=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/T60404-N4644-X400-300x290.jpg 300w, http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/T60404-N4644-X400.jpg 334w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><a href=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/4644-X400_en-240845.pdf\">4644-X400_en-240845<\/a> paimt\u0105 i\u0161 inverteri\u0173 schemotechnikos, galintis matuoti iki 31A (pagal techninnes specifikacijas palaiko OverCurrent iki 92A). Ma\u017eiausia matavimo srov\u0117 yra 3A. Gal pavyks i\u0161matuoti ir ma\u017eesn\u0119 srov\u0119. Matysim po operacini\u0173 stiprintuv\u0173 koregavimo gr\u012f\u017etamu ry\u0161iu.<\/p>\n<p>operaciniai stiprintuvai dirba neinvertuojan\u010dio stiprintuvo re\u017eimu:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-66\" src=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/NeinvertOpStipr-300x201.jpg\" alt=\"NeinvertOpStipr\" width=\"300\" height=\"201\" srcset=\"http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/NeinvertOpStipr-300x201.jpg 300w, http:\/\/vejas.defas.lt\/wp-content\/uploads\/2016\/06\/NeinvertOpStipr.jpg 456w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>\u012ftampos stiprinimo koeficientas skai\u010diuojamas pagal formul\u0119<\/p>\n<p>Uis=Uin*(R1+R2)\/R1<\/p>\n<p>Trys srov\u0117s ir trys \u012ftampos matavimo ta\u0161kai pajungti prie Atmel procesoriaus analogini\u0173 \u012f\u0117jim\u0173. Atmel procesoriaus ADC 10 bit\u0173 matavimo ribos 0&#8230;5V ir \u010dia sutelpa 1024 matavim\u0173. Matavimo paklaida gausis 0,1% arba -+10V (jeii matuosime minusin\u0119 \u012ftamp\u0105 tai 0,2% arba 20V ?!). Problema perslinkti operacinio stiprintuvo i\u0161\u0117jimo \u012ftamp\u0105 nuo -2.5V..+2.5V iki 0-5V. \u010cia bus reikalingas techninis sprendimas.<\/p>\n<p>Pabandysime primesti maitinimo blok\u0105 \u0161iai schemai. Procesoriui reik\u0117s +5V \u012ftampos, na o \u0161tai operaciniams stiprintuvams reik\u0117t\u0173 +15V ir -15V \u012ftampos. \u012esivaizduokime, kad turime +12 V akumuliatori\u0173, kaip maitinimo blok\u0105,\u00a0 i\u0161 kurio formuosime reikiamas \u012ftampas. +5V pagaminsime per 7805 stabilizavimo element\u0105, o minusinei \u012ftampai jau reikia keitiklio. Nesinori velti \u010dia impulsinio maitinimo bloko, ta\u010diau to nei\u0161vengsime, nes dar bus reikalinga akumuliatoriaus krovimo schema.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>U\u017eduotis: sukonstruoti galvani\u0161kai izoliuot\u0105 matuokl\u012f, matuojant\u012f 0-1000V diapazono \u012ftamp\u0105, su 0,1V paklaida. Tikslumas gaunasi 10000 padal\u0173. 16 bit\u0173 keitiklis tur\u0117s 2^16=65536 padal\u0173. Srov\u0117s matavimo riba tur\u0117t\u0173 siekti 50A. Primesta schema: Panaudosime srov\u0117s matavimo element\u0105: 4644-X400_en-240845 paimt\u0105 i\u0161 inverteri\u0173 schemotechnikos, galintis matuoti iki 31A (pagal techninnes specifikacijas palaiko OverCurrent iki 92A). Ma\u017eiausia matavimo srov\u0117 yra 3A. &hellip; <a href=\"http:\/\/vejas.defas.lt\/?p=62\" class=\"more-link\">Skaityti toliau: <span class=\"screen-reader-text\">\u012etampos matavimo adapteris<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-62","post","type-post","status-publish","format-standard","hentry","category-be-kategorijos"],"acf":[],"_links":{"self":[{"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/posts\/62","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=62"}],"version-history":[{"count":8,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/posts\/62\/revisions"}],"predecessor-version":[{"id":74,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=\/wp\/v2\/posts\/62\/revisions\/74"}],"wp:attachment":[{"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=62"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=62"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/vejas.defas.lt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}