El disparo de los SCRs puede ser auxiliado por algunos dispositivos de apoyo del tipo semiconductor o más antiguos usando tecnologías del tiempo de las válvulas. La acción de disparo de un SCR es lenta en algunos casos y, dependiendo de la aplicación, es necesario acelerar este proceso con el uso de dispositivos externos.

 

Los más utilizados son:

a) Lámpara neón

   Este es el proceso más antiguo, que aprovecha y entra en la conducción de una lámpara de neón cuando la tensión en sus terminales alcanza algo alrededor de 80 V, y pasa rápidamente al estado de plena conducción con la producción de un pulso que, aplicado a la conducción de un SCR, provoca su disparo rápido.

 

b) SUS

   El SUS o Silicon Unilateral Switch es un dispositivo semiconductor equivalente a la lámpara neón, entrando en conducción rápidamente, pero con una tensión más baja. Este dispositivo se coloca de la misma forma que la lámpara de neón, conectada a la conducción del SCR.

 

c) Transistores Unijutura (TUJ)

   Dispositivo semiconductor de unión única puede producir pulsos de alta intensidad, ideales para el disparo de SCRS y otros tiristores.

   En la figura tenemos los símbolos de estos componentes, así como sus curvas características.

 


| Clique na imagem para ampliar |

 

 

 

 

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