Crowbar Devresi Nedir & Nas\u0131l \u00c7al\u0131\u015f\u0131r? <\/h2>

Crowbar Devresi, g\u00fc\u00e7 kayna\u011f\u0131n\u0131n sa\u011flad\u0131\u011f\u0131 y\u00fckte a\u015f\u0131r\u0131 gerilim olmas\u0131 durumunda devrelerin hasar g\u00f6rmesini engelleyen bir devre \u00e7e\u015fididir.<\/p>

\n\nG\u00fc\u00e7 kaynaklar\u0131, elektrik ve elektronik devrelerde bulunmas\u0131 gereken \u00f6nemli elemanlardand\u0131r. Genellikle \u00e7ok sa\u011flam ve g\u00fcvenilirlerdir. Devreye iyi ve temiz g\u00fc\u00e7 sa\u011flarlar. Bir elektronik sistemin g\u00fcvenirlili\u011fi ve \u00f6mr\u00fc, kullan\u0131lan g\u00fc\u00e7 kayna\u011f\u0131yla olduk\u00e7a ilgilidir. G\u00fc\u00e7 kayna\u011f\u0131 ne kadar iyi ve sa\u011flamsa sistem o kadar sa\u011fl\u0131kl\u0131 \u00e7al\u0131\u015f\u0131r.<\/p>

Bir g\u00fc\u00e7 kayna\u011f\u0131<\/a><\/strong> herhangi bir nedenle ar\u0131zalan\u0131rsa, bazen g\u00fc\u00e7 kayna\u011f\u0131n\u0131n besledi\u011fi devre onar\u0131lmayacak \u00f6l\u00e7\u00fcde hasar g\u00f6r\u00fcr. Crowbar Devresi, g\u00fc\u00e7 kayna\u011f\u0131n\u0131n sa\u011flad\u0131\u011f\u0131 y\u00fckte a\u015f\u0131r\u0131 gerilim olmas\u0131 durumunda devrelerin hasar g\u00f6rmesini, g\u00fc\u00e7 kayna\u011f\u0131n\u0131n sisteme verdi\u011fi y\u00fck\u00fc azaltarak \u00f6nleyen basit bir elektrik devresidir.  Crowbar Devresi, a\u015f\u0131r\u0131 gerilim tespit edildi\u011finde g\u00fc\u00e7 kayna\u011f\u0131n\u0131n \u00e7\u0131k\u0131\u015f terminallerinin k\u0131sa devre olmas\u0131n\u0131 sa\u011flayarak y\u00fck\u00fc azalt\u0131r. G\u00fc\u00e7 kayna\u011f\u0131n\u0131n \u00e7\u0131k\u0131\u015f terminalleri k\u0131sa devre oldu\u011funda, b\u00fcy\u00fck ak\u0131m ak\u0131\u015f\u0131 sigortan\u0131n atmas\u0131n\u0131 sa\u011flar ve b\u00f6ylece g\u00fc\u00e7 kayna\u011f\u0131n\u0131 devrenin geri kalan\u0131ndan ay\u0131r\u0131r. Yani Crowbar devresi,  a\u015f\u0131r\u0131 voltaj\u0131 tespit eder ve sigortan\u0131n atmas\u0131n\u0131 sa\u011flar.<\/p>

Bir \u00f6rnek ile somutla\u015ft\u0131rmak i\u00e7in do\u011frusal g\u00fc\u00e7 kaynaklar\u0131 ile ilgili yayg\u0131n sorunlardan biri olan seri ge\u00e7i\u015f transist\u00f6r\u00fcn\u00fcn ar\u0131zalanmas\u0131n\u0131 inceleyelim. Ge\u00e7i\u015f transist\u00f6r\u00fcn\u00fcn toplay\u0131c\u0131 ve verici terminalleri aras\u0131nda bir k\u0131sa devre oldu\u011funda, transist\u00f6r <\/a><\/strong>ar\u0131zalan\u0131r ve \u00e7\u0131k\u0131\u015fta \u00e7ok y\u00fcksek ve d\u00fczensiz bir voltaj olu\u015fur. Bu y\u00fcksek voltaj ana sisteme verilirse, entegre devreler (IC) gibi hassas bile\u015fenler a\u015f\u0131r\u0131 voltaj nedeniyle \u00f6nemli hasar g\u00f6r\u00fcr. Bu durumun ya\u015fanmamas\u0131 i\u00e7in genelde g\u00fc\u00e7 kayna\u011f\u0131n\u0131n \u00e7\u0131k\u0131\u015f\u0131na basit bir a\u015f\u0131r\u0131 gerilim koruma devresi koyulur. B\u00f6ylece voltajda beklenmedik bir art\u0131\u015f olmas\u0131 durumunda ana devre veya y\u00fck hasar almaz. \u0130\u015fte bu a\u015f\u0131r\u0131 gerilim korumda devrelerinden bir tanesi Crowbar devresidir.\n\n<\/p>