Muchos lectores poseen transformadores con tensiones diferentes de 6 o 12V de secundario y nos preguntan como "alterar" tales componentes para poder usarlos en fuentes de 6, 12 o incluso otras tensiones en volts. Todo esto es sencillo Si hacemos uso de reguladores, como explicaremos a continuación.

Para tener una fuente de 12V o de 6V, no precisamos necesariamente de un transformador con secundario de esta tensión. En verdad hasta es mejor que la tensión del secundario sea mayor para que la etapa reguladora que sigue a la rectificadora funcione mejor... !dentro de ciertos limites, claro!

Si tenemos un transformador que dé 6V de tensión de secundario, este valor es RMS (valor eficaz), lo que significa que en verdad tenemos un valor de pico que llega a 6 x 1,41 = 8,46V (figura 1).

 

Figura 1
Figura 1

 

Así, si rectificamos esta tensión, el capacitor de filtro, cuando está cargado, tendrá entre sus armaduras prácticamente el valor de pico.

La conexión de una carga en un circuito de este tipo no será alimentada con 6V. Tampoco será de 8,46V Ia tensión aplicada, y si de un valor intermedio que dependerá de su corriente y del propio valor del capacitor usado.

Cuanto mayor fuera el capacitor, más próximo del valor de pico será la tensión en la carga, y cuanto mayor el consumo; más próxima de los 6V estará la tensión en la carga (figura 2).

 

Figura 2
Figura 2

 

Está claro que no todos los aparatos electrónicos admiten una banda de variación de tensión de alimentación tan amplia como ésta.

Es por este motivo que, normalmente, intercalamos entre la salida de tensión continua (después de. La rectificación y filtrado) una etapa reguladora. Tiene por finalidad garantizar una tensión fija en la carga independiente de la corriente exigida.

Una de las series más populares de circuitos integrados reguladores es la 78XX que tiene en los "XX" el valor de la tensión de salida. Así, el 7805 provee SV de salida; el 7806 proporciona 6V y el 7812 provee 12V. La corriente máxima para estos integrados es de 1ª (figura 3).

 

Figura 3
Figura 3

 

Para usar esos integrados es importante que la tensión máxima que se aplique a su entrada no supere los limites establecidos por el fabricante..

También es importante garantizar que la tensión de entrada del regulador sea mayor que el mínimo exigido por el integrado para un buen funcionamiento.

Teniendo en cuenta los integra- dos de 5, 6 y 12V tenemos las siguientes especificaciones dadas por Texas Instruments:

 

Condiciones de operación recomendadas

Integrado mínimo máximo medida
7805 7 25 V
7806 8 25 V
7812 14,5 30 V

Vea entonces que, para una fuente de 12V es conveniente que el transformador usado no sea simplemente de 12V. Si usamos uno de 15V estaremos con una tensión RMS por encima del mínimo exigido que es de 14,5V y con una tensión de pico de 21,15 que es bastante menos que el máximo permitido.

Podemos hasta usar un transformador de 18V que estará con un valor de RMS por encima de! mínimo y con un valor de pico de 25,38 que todavía estará abajo del máximo permitido. Este transformador puede perfectamente ser usado en nuestra fuente de 12V (figura 4).

 

Figura 4
Figura 4

 

Lo mismo es válido para otras tensiones, con una aplicación simple y segura.

EI capacitor de filtro recomendado para los diversos casos, garantizando un buen filtrado es:

 

a) Valor:

1000 µF para 12V

1500 µF para 6V

1500 µF para 5V

 

b) Tensión de trabajo: dos veces la tensión RMS del secundario del transformador.

 

 

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