Este control de potencia de media onda tiene la configuración más simple para el uso de SCR. Con él podremos controlar el brillo de pequeñas bombillas incandescentes, elementos de calentamiento de invernaderos y acuarios y la velocidad de pequeños motores de corriente alterna.

   El dimmer o control de potencia que presentamos tiene una configuración mínima para controlar de 0 a 50% la potencia aplicada a una carga, como una bombilla incandescente pequeña.

   Podemos usarlo en una lámpara, por ejemplo, para obtener luz débil en un dormitorio o en un pasillo o punto de acceso que no debe quedar totalmente en la oscuridad.

   El circuito sólo debe utilizarse con lámparas incandescentes, elementos de calefacción o motores universales.

   No utilice este circuito con equipos electrónicos o lámparas económicas o fluorescentes.

 

   Como funciona

   El modo más simple de controlar la potencia aplicada a una carga es ligando un reóstato en serie, como muestra la figura 1.

 

   Figura 1 - Control por reóstato
   Figura 1 - Control por reóstato

 

  Sin embargo, este tipo de control tiene por desventajas la necesidad de utilizar un reóstato (o potenciómetro) de alta disipación y las grandes pérdidas que ocurren en la forma de calor disipador en el elemento de control.

   Una forma mucho más conveniente de obtener un control de potencia es a través del denominado control de fase (ver más en el sitio escribiendo "dimmer" en la búsqueda - tenemos diversos circuitos con explicaciones completas).

   En este circuito, el ángulo de conducción del SCR determina el rango de potencias aplicado a la carga, como muestra la figura 2.

 

   Figura 2 - Rango de potencias del aparato
   Figura 2 - Rango de potencias del aparato

 

   

Como en nuestro proyecto usamos un SCR que conduce sólo en un sentido, sólo la mitad de los semiciclos de la tensión de la red es conducida y la banda va hasta el 50%.

    En este circuito el punto de disparo y, por lo tanto, el ángulo de conducción son obtenidos por la constante de tiempo de P1 / R1 y el condensador, determinando la tensión de disparo de la lámpara neon.

   Para tener la pista completa se puede adoptar la rectificación de onda completa que describimos en otros proyectos del sitio o bien poner en paralelo una llave que haga la conexión directa.

   

Montaje

   En la figura 3 tenemos el diagrama completo del dimmer.

 

   Figura 3 - Diagrama completo del control de potencia
   Figura 3 - Diagrama completo del control de potencia

 

   El circuito se puede montar tanto en placa de circuito impreso como en puente de terminales.

    Una versión simplificada del montaje utilizando puente de terminales se muestra en la figura 4.

 

   Figura 4 - Montaje en puente
   Figura 4 - Montaje en puente

 

   El circuito puede controlar hasta 300 W de cargas en 110 V y 600 W en 220 V.

   El SCR debe estar dotado de un disipador de calor, siendo sufijo B o D si la red es de 110 V y sufijo D, si la red es de 220 V.

   C1 es de poliéster y eventualmente puede ser alterado para obtener el control en el rango total

   

SCR -TIC106B o D - diodo controlado de silicio

NE-1 - lámpara de neón común

P1 - 220 k ohms - pote

R1, R2 - 10 k ohms x 1/8 W - resistor - marrón, negro, naranja

C1 - 100 nF - capacitor de poliéster

X1 - carga (lámpara incandescente de hasta 100 W)

 

Varios:

Puente de terminales, cable de alimentación, hilos, soldadura.

 

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