Los dobladores de tensión son circuitos que, al mismo tiempo que operan como rectificadores, permiten obtener una salida de tensión dos veces mayor que la que se obtendría con los procesos comunes de rectificación (media onda, onda completa y punta).

   Tenemos dos configuraciones básicas de plegadoras de tensión:

 

a) doblador de media onda:

    La dobladora de media onda se muestra en la figura 1 Utilizando sólo un diodo y un condensador. Su funcionamiento es el siguiente:


 

 

 

   En los semiciclos en los que el diodo es polarizado en el sentido directo, cuando su resistencia es mucho menor que la carga, ocurre la circulación de una corriente intensa que lleva al condensador a cargarse prácticamente con el valor de pico de la tensión alternante de alimentación.

   En los semiciclos en que el diodo es polarizado en sentido inverso, no hay circulación de corriente por el diodo y la tensión de la red prácticamente se suma a la tensión manifestada por el capacitor cargado. Esta tensión doble aparece en el circuito de carga que entonces se alimenta.

 

b) Doblador de onda completa

   Como muestra el circuito de la figura 2 se utilizan dos diodos y dos capacitores para obtener la dotación de onda completa.

   Conforme un rápido análisis del circuito revela, lo que tenemos es la utilización de dos circuitos simples de doblador de más onda en oposición de modo que uno funciona con los semiciclos positivos y el otro con los negativos, habiendo, por lo tanto, la conducción de corriente por la carga en los dos semiciclos.


 

 

 

 

Temas abordados:

• Doblador de media onda (97)

• Doblador de onda completa (98)

 

Ver también:

• Diodos semiconductores (66)

• Diodos Rectificadores (63)

• Multiplicadores de tensión

 

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