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Which among the following is offered as input to a controller?

Which among the following is offered as input to a controller? Correct Answer Error signal

  • A controller is essentially the comparator that compares the given input with the reference input and generates the error signal.
  • The reference input is the actual signal input to the control system.
  • The error signal is the input to the controller, and it causes the output to be the desired output.
  • The controller is used in closed-loop control systems.

 

Closed-loop control system:

The closed-loop control system can be described by a block diagram as shown in the figure below.

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r(t) is the error signal given to the input of the controller.

These are the systems in which the control action depends on the output. These systems have a tendency to oscillate.

Ex: Temperature controllers, speed control of the motor, systems having sensors, etc.

Advantages:

  • More accurate
  • Non-linear distortions are less
  • The output is less sensitive to parameter changes within the system
  • Bandwidth increases

Disadvantages:

  • Design is complicated
  • More expensive
  • May become unstable, if there are malfunctions in the feedback.

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