El circuito de la figura se puede utilizar para disparar un triac o un comparador en un proyecto en el que se necesite un pulso que se produzca exactamente en determinado ángulo de fase de una señal sinusoidal aplicada a la entrada. El capacitor de 220 nF para la red de 110 V y 470 nF para la red de 220 V es dimensionado para obtener, con el ajuste del potenciómetro de 100 k ohmios retardos entre 0 y 180 grados aproximadamente. Para otras frecuencias de las señales senoidales el capacitor debe ser recalculado. Observe que el diac va a conducir y permanecer hasta que la señal de entrada tenga su paso por cero. Entre el instante del disparo y este instante tenemos la descarga del condensador a través del resistor de carga y la producción del pulso de salida. Esto significa que si el resistor de carga no se ajusta correctamente no habrá la descarga completa del condensador y con ello el disparo en el semiciclo siguiente ocurrirá con un ángulo menos y así sucesivamente llevando el circuito a un funcionamiento de forma no deseada. La amplitud del pulso de salida producido por este circuito es la tensión de disparo del DIAC ya que estará presente en el capacitor en este instante.

 


 

 

 

 

18.837MBMemory Usage38.44msRequest Duration
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PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
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