Uno de los principales problemas de los controles de potencia que usan S CRS y Triacs es la producción de interferencias en las bandas de radiofrecuencia en vista de la conmutación rápida. Con el circuito que presentamos, el control de cargas pequeñas puede hacerse sin ese problema, ya que emplea un transitar de potencia de alta tensión como reóstato.

Pequeños motores como los de ventiladores, afeitadoras, etc., pueden controlarse con este circuito que no usa SCR ni triac y por consiguiente no existe el problema y la' incomodidad de la interferencia por conmutación que puede afectar a los equipos de sonido (receptores) y de televisión.

El circuito se basa en un BU208 que tiene una tensión máxima colector/emisor de 700 volts y que, por consiguiente, puede emplearse en la red de 220 V.

La capacidad de corriente sin embargo, es baja y por lo que, no se aconseja el uso de cargas de más de 30 watts.

El transistor tiene poca ganancia, lo que exige una buena potencia de excitación en la base, o si el lector to prefiere, se cambia por otro de mayor ganancia.

 

Como funciona

Como los transistores sólo pueden controlar la corriente que fluye en un sentido, se utiliza un puente de diodos de manera de asegurar el control de la onda completa, como sugiere la figura 1.

 


 

 

De esta forma se garantiza la circulación de los dos semiciclos por el motor, aunque no en el mismo sentido.

Para polarizar la base del transistor se usa un divisor con potenciómetro, alimentado por una tensión baja obtenida del transformador T1.

Esa baja tensión también se rectifica y filtra para que el sistema funcione como un reóstato.

Eventualmente el resistor R1 y el potenciômetro deben reducirse para que pueda excitarse et transistor. Recordamos que en este caso el resistor debe ser de 1 W por lo menos y el potenciômetro es de alambre.

Los diodos rectificadores del puente deben tener tensión inversa de pico según la red local, o sea 22oV si la red fuera de 110 V, y 400 V si fuera de 220 V. El 1N4007 sirve para las dos redes.

Para el sector de baja tensión pueden usarse los mismos de la serie a partir del 1N4002.

El transformador debe tener un bobinado secundario de 100 mA ó más.

Recordamos que el circuito no está aislado de la red lo que significa que hay que tener cuidado para evitar los golpes de corriente.

 

Montale

En la figura 2 damos el circuito completo del control.

 


 

 

En la figura 3 tenemos la placa del circuito impreso sobre la que se puede fijar el disipador de calor del transistor.

 


 

 

En el montaje hay que observar tas precauciones normales, teniendo en cuenta que los conductores de las corrientes principales deben ser más anchas.

Si el aparato se utilizara en la red de 220 V, el transformador debe tener un bobinado primario para esa tensión.

Se recomienda la instalación de la unidad en una caja de plástico con el disipador del lado de afuera.

 

Prueba y uso

Para la prueba utilice siempre motores o cargas de poca potencia, dentro de la capacidad de control de la unidad.

Pueden emplearse un ventilador chico, una afeitadora o una lámpara de hasta 25 watts.

Si no hubiera control total, es decir si no se consiguiera la potencia máxima, entonces el resistor R1 y el potenciômetro P1 deben reducirse. Otra posibilidad es la de usar transistor de mayor ganancia.

 


 

 

 


 

 

 

Originale 1988 (revisado 2017)

 

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