Onda Completa y Prueba de SCRs (ART848S)

Written by: INCB
Category: Artículos Técnicos y Proyectos

a) Control de onda completa

Una manera de conseguir un control de onda completa incluso usando SCRs que son controles de media onda, consiste en el acrecimiento de un puente de diodos conforme el lector podrá ver en la figura 1.

 

Figura 1 - Uso de un puente de control de onda completo
Figura 1 - Uso de un puente de control de onda completo

 

Este puente hace que tengamos ambos semiconductores de corriente alterna aplicados a la carga.

Los diodos "invierte" uno de los semiciclos de la alimentación. Los diodos para esta aplicación deben ser capaces de conducir la intensidad de corriente que se pretende controlar con el SCR y deben ser especificados para una tensión máxima, mayor que el valor de pico de la tensión de alimentación.

 

b) Comprobando SCRs

Podemos probar un SCR con el multímetro con el procedimiento que el lector podrá ver en la figura 2. Este procedimiento consiste en realizar tres medidas:

 

Figura 2 - prueba de SCR
Figura 2 - prueba de SCR

 

- La resistencia directa de la unión gate-cátodo debe ser baja e inversa debe ser alta. Si las dos medidas dan resistencia alta, tendremos un SCR abierto, y dando baja, tendremos un SCR en corto.

- La resistencia entre el cátodo y el ánodo debe ser alta en cualquier sentido. Si baja, tendremos un SCR en corto.

- La resistencia entre el comportamiento y el ánodo debe ser alta en ambos sentidos. Si baja, tendremos un SCR en corto.

 

pcbway_012_2024

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N° de Componente 

Banco de Circuitos

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