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Gönderen Konu: Sıcaklıkla direnci artan termistöre PTC ve Çalışması  (Okunma sayısı 992 defa)

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Sıcaklıkla direnci artan termistöre PTC ve Çalışması
« : Kasım 19, 2008, 12:24:48 ÖS »
PTC

Çalışma Prensibi

Bulunduğu ortamın veya temas ettiği yüzeyin sıcaklığı arttıkça elektriksel direnci
artan devre elemanıdır.




Şekil 2.1: a Çeşitli PTC’ler b:Karakteristiği c:Sembolü

PTC lerin Kullanım Alanları

PTC’ler - 60 ºC ile +150 ºC arasındaki sıcaklıklar da kararlı bir şekilde çalışır. 0.1 ºC’
ye kadar duyarlılıkta olanları vardır. Daha çok elektrik motorlarını fazla ısınmaya karşı
korumak için tasarlanan devrelerde kullanılır. Ayrıca ısı seviyesini belirli bir değer
aralığında tutulması gereken tüm işlemlerde kullanılabilir.

PTC’nin Sağlamlık Testi

PTC’yi Şekil 2.2’de görüldüğü ohmmetreye bağladığınızda ilk olarak oda sıcaklığında
PTC’nin üzerinde yazılı değeri okumanız gerekiyor. Daha sonra mum veya benzeri bir araç
ile ısıttığınızda direnci yükseliyor ise PTC sağlamdır. Bunun dışında bir durum gerçekleşiyor
ise PTC arızalıdır.




Şekil 2.2: PTC’nin sağlamlık testi




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