El bloque mostrado en este artículo es un simple control PWM para motores de corriente continua de hasta varios amperes, dependiendo del transistor elegido para Q1 (ver tablas). El circuito está formado por un oscilador de baja frecuencia usando una de las cuatro puertas de un 4093 IC.

   Las otras tres puertas están cableadas como un buffer / amplificador para impulsar el transistor de salida.

   El capacitor C1 determina el rango de frecuencia y debe elegirse para adaptarse al motor. En algunos casos, puede producirse alguna vibración del motor si se utiliza un capacitor inapropiado.

   El resistor R1 determina el menor ancho de pulso aplicado al motor. Y la relación entre P1 y R2 establece el ciclo de trabajo máximo del control.

   Los experimentos con R1 y R2 deben realizarse para encontrar el mejor rango de funcionamiento para cualquier motor.

   D1 y D2 pueden ser cualquier diodo de silicio de uso general tal como el 1N914,1N4148, o incluso el 1N4002.

   El pino 1 del IC se puede utilizar como una entrada de habilitación externa, operando así como shield para un microcontrolador. El circuito se puede utilizar con el transistor Darlington si reemplaza R3 con una resistencia de 4.7 k ohms.

 

 

 
 

 

 

  La figura 1 muestra el diagrama esquemático de este proyecto.

 

 

  Figura 1 - Esquemas del proyecto
  Figura 1 - Esquemas del proyecto

 

 

   La figura 2 muestra una versión para este circuito que utiliza un MOSFET de potencia.

 

 

Figura 2 - Uso de un MOSFET de potencia
Figura 2 - Uso de un MOSFET de potencia

 

 

  Una placa de circuito impreso se muestra en la figura 3. Tenga cuidado con la posición del transistor, ya que según el tipo el terminal puede cambiar sus posiciones.

 

Figura 3 - Placa de circuito impreso para el proyecto
Figura 3 - Placa de circuito impreso para el proyecto

 

    

 

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