La posibilidad de conseguir LED de alto brillo lleva a muchos a pensar en montar su propio sistema de iluminación con LED o incluso la lámpara de LED. En nuestro artículo ART627S (LEDs en 110-220 V) y otros, abordamos el tema de diversas formas, dando circuitos, sugerencias y enseñando a calcular los componentes. En este artículo, damos algunos circuitos prácticos adicionales que pueden ser de gran utilidad para nuestros lectores.

Lo que diferencia los LED de las lámparas en los circuitos de corriente alterna es que los LEDs, además de operar exclusivamente con corriente continua, también necesitan una baja tensión, típicamente entre 1,8 y 3,2 V según su color.

Además, lo que determina su brillo es la intensidad de la corriente circulante y no la tensión aplicada.

Todo esto requiere circuitos especiales para su accionamiento, circuitos que consisten básicamente en convertidores AC / DC que produzcan bajas tensiones bajo corrientes de acuerdo con el número de LED y tipo, todo ello con un alto rendimiento.

De hecho, la principal exigencia del circuito de accionamiento de LEDs cuando lo utilizamos para iluminación es la economía, y el ahorro de energía implica un alto rendimiento.

A continuación, algunas ideas prácticas de circuito que no se abordaron en nuestros artículos anteriores.

Uno de los modos más simples de conectar LED a la red con pocos componentes es lo que hace uso de un capacitor reductor, como muestra la figura 1.

 

Figura 1- Circuito simple para 1 LED
Figura 1- Circuito simple para 1 LED

 

Sin embargo, podemos eliminar los dos diodos, si tomamos en cuenta que en lugar de D2 podemos usar otros LED, pues LEDs son diodos y con ello tener la alimentación directa por corriente alterna, como muestra la figura 2.

 

Figura 2 - Circuito para dos LEDs en 110 V
Figura 2 - Circuito para dos LEDs en 110 V

 

Para 220 V, basta con cambiar VC1 a 220 nF. El valor de este capacitor no es crítico en las dos redes, dependiendo del brillo del LED. Así, para LED de mayor brillo, podemos usar 1 uF en 110 V y 470 nF en 220 V.

El capacitor debe ser de poliéster con una tensión de al menos 250 V en la red de 110 V y 350 V en la red de 220 V.

Para más LED, podemos utilizar la configuración de la figura 3.

 

Figura 3 - de 4 a 20 LED se pueden utilizar en este circuito
Figura 3 - de 4 a 20 LED se pueden utilizar en este circuito

 

Como en el circuito anterior, el valor del capacitor dependerá del brillo de los LED usados.

Para 16 a 40 LED, con hasta 10 en cada secuencia, podemos utilizar el circuito de la figura 4. En él, el valor del capacitor puede ser cambiado, conforme el brillo deseado para los LED.

 

Figura 4 - Conexión de secuencias de LED en paralelo
Figura 4 - Conexión de secuencias de LED en paralelo

 

Otra configuración, usando diodos rectificadores conectados de modo que uno de ellos no deje los LEDs ser polarizados en el sentido inverso se muestra en la figura 5.

El valor del capacitor C1 depende de la corriente deseada en las secuencias de LEDs pudiendo quedar entre 1 y 4,7 uF.

En paralelo a D1 se puede utilizar un capacitor adicional que evitará el parpadeo de los LED, es decir, que parpadeen en la frecuencia de la red, evitando así un efecto estroboscópico.

 

Figura 5 - Circuito con rectificador
Figura 5 - Circuito con rectificador

 

La cantidad de LED de este circuito puede ser muy grande, dependiendo sólo del valor de C1.

En cada secuencia se pueden conectar de 4 a 10 LED.

 

Figura 6 - Capacitor para evitar el efecto estroboscópico
Figura 6 - Capacitor para evitar el efecto estroboscópico

 

Los resistores R1 y R2 deben tener disipaciones apropiadas.

Para proteger el circuito se puede utilizar un fusible de 500 mA a 800 mA, conectado de la forma indicada en la figura 7.

 

Figura 7 - Uso de un fusible de protección
Figura 7 - Uso de un fusible de protección

 

 

 

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