{"id":842,"date":"2017-04-25T19:56:19","date_gmt":"2017-04-25T16:56:19","guid":{"rendered":"https:\/\/burakcaliskan.org\/blog\/?p=842"},"modified":"2017-05-08T23:21:24","modified_gmt":"2017-05-08T20:21:24","slug":"acs712-akim-sensoru","status":"publish","type":"post","link":"https:\/\/burakcaliskan.org\/blog\/acs712-akim-sensoru\/","title":{"rendered":"ACS712 Ak\u0131m Sens\u00f6r\u00fc"},"content":{"rendered":"

1- K\u00fc\u00e7\u00fck boyut:<\/strong><\/p>\n

ACS712 nin 30 A lik modeli bile SOIC8 k\u0131l\u0131fta bulunabiliyor. Bu da ak\u0131m \u00f6l\u00e7\u00fcm\u00fc yap\u0131lacak devrede, sistemde \u00e7ok b\u00fcy\u00fck bir yer avantaj\u0131 demek. Ayr\u0131ca di\u011fer modellerini incelerseniz e\u011fer 200 A ak\u0131m \u00f6l\u00e7ebilen bir modelinin boyutuna \u015fa\u015f\u0131raca\u011f\u0131n\u0131z\u0131 ve o seviyede bir ak\u0131m \u00f6l\u00e7\u00fcm\u00fc i\u00e7in ba\u015fka hi\u00e7bir\u015feye gerek b\u0131rakmad\u0131\u011f\u0131n\u0131 s\u00f6yleyebilirim. 200 A lik versiyonun k\u0131l\u0131f\u0131 a\u015fa\u011f\u0131daki gibidir.<\/p>\n

acs756<\/p>\n

\"\"<\/p>\n

2- A\u015f\u0131r\u0131 kolay kullan\u0131m:<\/strong><\/p>\n

San\u0131r\u0131m Allegro firmas\u0131 y\u0131llard\u0131r bizim gibi bu ak\u0131m \u00f6l\u00e7me i\u015finde \u00e7ile \u00e7ekmi\u015f insanlar\u0131 duymu\u015f olacak ki kullan\u0131m\u0131 son derece kolay bir sens\u00f6r geli\u015ftirmi\u015f. A\u015fa\u011f\u0131daki temsili \u015femas\u0131ndan da g\u00f6r\u00fclebilece\u011fi \u00fczere ak\u0131m\u0131 1-4 bacaklar\u0131ndan ge\u00e7irip di\u011fer taraf\u0131ndaki 5-8 nolu bacaklara 5V-GND ve fitre kapasit\u00f6r\u00fcn\u00fc ekleyip direk olarak ak\u0131mla lineer orant\u0131l\u0131 \u015fekilde Vout pininden gerilimi okuyarak ak\u0131m de\u011ferini elde edebiliyoruz.<\/p>\n

712sema<\/p>\n

\"\"<\/a><\/p>\n

K\u00f6r\u00fcn istedi\u011fi bir g\u00f6z Allah verdi iki g\u00f6z. Sens\u00f6r\u00fcm\u00fcz DC ak\u0131mda her iki y\u00f6nde de ak\u0131m \u00f6l\u00e7ebiliyor. Bu \u00f6zelli\u011fi sayesinde AC ak\u0131m\u0131 da rahatl\u0131kla \u00f6l\u00e7me \u00f6zelli\u011fine sahip.<\/p>\n

Ayr\u0131ca veri sayfas\u0131nda sens\u00f6r\u00fcn genel \u00f6zellikleri a\u015fa\u011f\u0131daki gibi s\u0131ralanm\u0131\u015ft\u0131r:<\/p>\n

\"\"<\/a><\/p>\n

Dikkat edilmesi gereken noktalar ve ayarlar olmakla birlikte e\u011fer hassas okumaya ihtiyac\u0131m\u0131z yok ise bize bu kadar\u0131 yeterli. Sens\u00f6r\u00fcn Vout pinini kullanaca\u011f\u0131m\u0131z mikroi\u015flemcinin ADC mod\u00fcl\u00fcne direk olarak girebiliriz.<\/p>\n

\"\"<\/a><\/p>\n

Vout Pininden nas\u0131l bir \u00e7\u0131k\u0131\u015f al\u0131r\u0131m?<\/b><\/p>\n

Sens\u00f6r\u00fcn veri sayfas\u0131n\u0131 incelerseniz e\u011fer size kulland\u0131\u011f\u0131n\u0131z sens\u00f6r modelinin ak\u0131m ba\u015f\u0131na size sa\u011flayaca\u011f\u0131 voltaj de\u011ferini g\u00f6rebilirsiniz.<\/p>\n

\"\"<\/a><\/p>\n

Tablodan da g\u00f6r\u00fclebilece\u011fi \u00fczere ACS712-05B sens\u00f6r\u00fc \u00fczerinden ge\u00e7en 1 Ampere kar\u015f\u0131l\u0131k 185 mV voltaj \u00fcretiyor.<\/p>\n

Peki sens\u00f6r\u00fc ald\u0131m ve 5 v beslemesini verdim sens\u00f6r \u00e7\u0131k\u0131\u015f\u0131n\u0131 Vout pinini \u00f6l\u00e7t\u00fc\u011f\u00fcmde 2.5 volt g\u00f6r\u00fcyorum, neden?<\/p>\n

Yine tablodan bakarsak sens\u00f6r\u00fcm\u00fcz +- 5A \u00f6l\u00e7ebiliyor. + ve \u2013 ak\u0131m y\u00f6nlerinin Vout pininden \u00f6l\u00e7\u00fclebilmesi i\u00e7in 2.5 V offset de\u011feri olarak belirlenmi\u015f. Ak\u0131m y\u00f6n\u00fc IP+ pinlerinden IP- pinlerine do\u011fru oldu\u011funda 2.5 V un \u00fczerinde, tam tersi oldu\u011funda ise 2.5 v un alt\u0131nda voltaj de\u011fi\u015fimini rahatl\u0131kla g\u00f6rebilirsiniz.<\/p>\n

\"\"<\/a><\/p>\n

Sens\u00f6r\u00fcn kullan\u0131m\u0131nda bir ka\u00e7 p\u00fcf noktaya de\u011finelim:<\/p>\n

Fitre kapasit\u00f6r\u00fc:<\/p>\n

\u015eematikten de g\u00f6r\u00fclebilece\u011fi \u00fczere sens\u00f6r\u00fcm\u00fcz\u00fcn bir baca\u011f\u0131na filtre kondansat\u00f6r\u00fcm\u00fcz\u00fc ba\u011fl\u0131yoruz. Bu filtre kondansat\u00f6r\u00fc \u00f6nceki modellerinde yoktu ancak yeni modellerinde bu \u00f6zelli\u011fi d\u0131\u015far\u0131ya vermi\u015fler. Bu sayede filtre kondansat\u00f6r\u00fcnde de\u011fi\u015fiklik yap\u0131p kullanaca\u011f\u0131m\u0131z yere g\u00f6re sens\u00f6r\u00fcm\u00fcz\u00fc optimize edebiliriz.<\/p>\n

Tablo \u00fczerinden konu\u015facak olursak, sens\u00f6r\u00fcm\u00fcz\u00fcn \u00e7\u0131k\u0131\u015f\u0131nda her zaman bir g\u00fcr\u00fclt\u00fc mevcut oldu\u011fu g\u00f6r\u00fclebilir. Bu g\u00fcr\u00fclt\u00fc de\u011ferini azaltmak i\u00e7in filtre kapasit\u00f6r\u00fcm\u00fcz\u00fc artt\u0131rabiliriz bu sens\u00f6r\u00fcm\u00fcz\u00fcn \u00e7\u00f6z\u00fcn\u00fcrl\u00fck de\u011ferini de artt\u0131r\u0131yor ancak BW de\u011ferimiz ciddi \u015fekilde azal\u0131yor. Cf nin de\u011ferini artt\u0131rd\u0131\u011f\u0131m\u0131zda sens\u00f6r\u00fcn \u00f6l\u00e7ebilece\u011fi frekans de\u011ferinin do\u011fal olarak d\u00fc\u015fmesi, bu bir manaya response time \u0131n da d\u00fc\u015fece\u011fi anlam\u0131na geliyor. Allegro veri sayfas\u0131nda bu durumdan bir grafikle bahsetmi\u015f.<\/p>\n

\"fcapgraf\"<\/a><\/p>\n

Peki tabloda belirtilen kapasit\u00f6r de\u011ferlerinden daha y\u00fckseklerini takarsak g\u00fcr\u00fclt\u00fc oran\u0131 ayn\u0131 oranda d\u00fc\u015fecek midir?<\/p>\n

Ben burada Cf de\u011ferini 470 nF olarak de\u011fi\u015ftirerek yapt\u0131\u011f\u0131m testlerde g\u00fcr\u00fclt\u00fc oran\u0131n\u0131n ciddi \u015fekilde azald\u0131\u011f\u0131n\u0131 g\u00f6rd\u00fcm. Bu \u015fekilde ger\u00e7ekten iyi bir \u00e7\u00f6z\u00fcn\u00fcrl\u00fck elde edilebilir ancak \u00fcstte soldaki grafikten de g\u00f6r\u00fclebilece\u011fi \u00fczere sens\u00f6r\u00fcn response time s\u00fcresi ciddi \u015fekilde artmakta. 470 nF de\u011ferinde bir kondansat\u00f6rle 1.120 ms response time de\u011ferimiz oluyor. \u00d6rne\u011fin 220\u00a0 V 50 Hz lik alternatif ak\u0131mla \u00e7al\u0131\u015fan bir y\u00fck\u00fc \u00f6l\u00e7mek istiyor isek bu de\u011fer bizim hassasl\u0131\u011f\u0131m\u0131z\u0131 ciddi \u015fekilde d\u00fc\u015f\u00fcrecektir. Response time bizim i\u00e7in \u00e7ok problem de\u011fil ise DC bir ak\u0131m\u0131n \u00f6l\u00e7\u00fcm\u00fcn\u00fc yapacak ise Cf i rahatl\u0131kla artt\u0131rabilirsiniz. Hem g\u00fcr\u00fclt\u00fc oran\u0131 d\u00fc\u015fecek hem de \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fcn\u00fcz artacakt\u0131r. Yani \u00f6zetle \u00f6l\u00e7\u00fcm yapaca\u011f\u0131n\u0131z sistemi b\u00fct\u00fcn olarak ele al\u0131p \u00e7\u00f6z\u00fcn\u00fcrl\u00fck-response time-bant geni\u015fli\u011fi \u00fc\u00e7geninde sens\u00f6r\u00fcn\u00fcz\u00fcn kullan\u0131m \u015feklini optimize etmeniz gerekecek. Ayr\u0131ca sens\u00f6r \u00e7\u0131k\u0131\u015f\u0131ndaki g\u00fcr\u00fclt\u00fcn\u00fcn sadece sens\u00f6re ba\u011f\u0131ml\u0131 olmad\u0131\u011f\u0131n\u0131 ilk ba\u015fta sens\u00f6r\u00fcm\u00fcz\u00fc besledi\u011fimiz 5 V un ripple de\u011ferinin minimumda olmas\u0131 gerekti\u011fini belirtmek isterim. Bu konuya dedi\u011fim gibi ayr\u0131 bir ADC konusunda de\u011finece\u011fim.<\/p>\n

Son olarak s\u0131cakl\u0131\u011f\u0131n sens\u00f6r \u00fczerindeki etkisine de bakacak olursak veri sayfas\u0131nda offset gerilimi ve \u00f6l\u00e7\u00fcm sonu\u00e7lar\u0131na s\u0131cakl\u0131k de\u011ferinin etkisi de grafiksel olarak verilmi\u015f durumda. E\u011fer sistemimiz farkl\u0131 iklim ko\u015fullar\u0131nda \u00e7al\u0131\u015facak ise mutlaka bu de\u011ferleri g\u00f6z \u00f6n\u00fcne almam\u0131z gerekli.<\/p>\n","protected":false},"excerpt":{"rendered":"

1- K\u00fc\u00e7\u00fck boyut: ACS712 nin 30 A lik modeli bile SOIC8 k\u0131l\u0131fta bulunabiliyor. Bu da ak\u0131m \u00f6l\u00e7\u00fcm\u00fc yap\u0131lacak devrede, sistemde \u00e7ok b\u00fcy\u00fck bir yer avantaj\u0131 demek. Ayr\u0131ca di\u011fer modellerini incelerseniz e\u011fer 200 A ak\u0131m \u00f6l\u00e7ebilen bir modelinin boyutuna \u015fa\u015f\u0131raca\u011f\u0131n\u0131z\u0131 ve o seviyede bir ak\u0131m \u00f6l\u00e7\u00fcm\u00fc i\u00e7in ba\u015fka hi\u00e7bir\u015feye gerek b\u0131rakmad\u0131\u011f\u0131n\u0131 s\u00f6yleyebilirim. 200 A lik versiyonun […]<\/p>\n","protected":false},"author":2,"featured_media":852,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[179],"tags":[221,440],"_links":{"self":[{"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/posts\/842"}],"collection":[{"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/comments?post=842"}],"version-history":[{"count":4,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/posts\/842\/revisions"}],"predecessor-version":[{"id":889,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/posts\/842\/revisions\/889"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/media\/852"}],"wp:attachment":[{"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/media?parent=842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/categories?post=842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/burakcaliskan.org\/blog\/wp-json\/wp\/v2\/tags?post=842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}