SUS es el acrónimo de Silicon Unilateral Switch o Llave Unilateral de Silicio. Se trata de un dispositivo semiconductor de la familia de los tiristores usado en conmutación. En la figura 1 tenemos el símbolo usado para representar ese componente y su circuito equivalente, que nos permite entender su funcionamiento.

Los SUS se utilizan en el disparo de SCR y en la producción de pulsos (formas de onda), además de otras aplicaciones. Como los SCR y otros dispositivos de la familia los SUS consisten en claves regenerativas con la diferencia de que en su compuerta (gate) existe un diodo zener que determina la tensión de disparo del componente. Otro hecho que diferencia el SUS de un SCR es que su disparo es hecho por la conducta de ánodo.

En funcionamiento, cuando la tensión entre el ánodo y el cátodo se vuelve lo suficientemente positivo para producir la conducción del diodo zener, el SUS se dispara, es decir, pasa de estado de apagado al de plena conducción, fluyendo entonces una corriente intensa entre el paso, el ánodo y el cátodo. Normalmente el diodo zener interno existente en los SUS tiene una tensión de 7,4 V lo que, teniendo en cuenta la barrera de potencial entre el ánodo y la compuerta, determina una tensión de disparo del orden de 8 V. Para los casos en que si desea una tensión de disparo menor, basta con conectar un diodo zener de valor apropiado entre la compuerta y el cátodo.


 

 

 

 

 

SUS (ALM198S )

SUS es el acrónimo de Silicon Unilateral Switch o Llave Unilateral de Silicio. Se trata de un dispositivo semiconductor de la familia de los tiristores usado en conmutación. En la figura 1 tenemos el símbolo usado para representar ese componente y su circuito equivalente, que nos permite entender su funcionamiento.

Los SUS se utilizan en el disparo de SCR y en la producción de pulsos (formas de onda), además de otras aplicaciones. Como los SCR y otros dispositivos de la familia los SUS consisten en claves regenerativas con la diferencia de que en su compuerta (gate) existe un diodo zener que determina la tensión de disparo del componente. Otro hecho que diferencia el SUS de un SCR es que su disparo es hecho por la conducta de ánodo.

En funcionamiento, cuando la tensión entre el ánodo y el cátodo se vuelve lo suficientemente positivo para producir la conducción del diodo zener, el SUS se dispara, es decir, pasa de estado de apagado al de plena conducción, fluyendo entonces una corriente intensa entre el paso, el ánodo y el cátodo. Normalmente el diodo zener interno existente en los SUS tiene una tensión de 7,4 V lo que, teniendo en cuenta la barrera de potencial entre el ánodo y la compuerta, determina una tensión de disparo del orden de 8 V. Para los casos en que si desea una tensión de disparo menor, basta con conectar un diodo zener de valor apropiado entre la compuerta y el cátodo.


 

 

 

 

 

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