Difference between Feedback and Feed Forward control systems

1. Feedback Control System :
Feedback control system is basically a control system where the output depends on the generated feedback signal. Feedback control system is responsible for processing the feedback signals which further act as an input to the system. Feedback control system consist of different components such as resistors, transistors and other electrical appliances which do the basic functioning. The feedback can further be divided into positive feedback and negative feedback.

2. Feed forward Control System :
Feed forward control system is a system which passes the signal to some external load. It rejects the disturbances before they affect the controlled variable. It controls the major disturbances and is many times used with the combination of a feedback system. Feed forward systems are sensitive to modelling errors. It does direct measurement of the disturbances in the system.



Difference between Feedback and Feed Forward Control Systems :

S.NO. Feedback Control System Feed Forward Control System
1. In feedback system output depends on the generated feedback signal. In feed forward system the signal is passed to some external load.
2. Measure of disturbances in the system is not needed by feedback system. Measure of disturbances in the system is needed by feedback system.
3. All the disturbances are detected in feedback system. All the disturbances are not detected in feedback system.
4. The loop in a feedback system is a closed loop. The loop in a feedback system is a open loop.
5. It focuses on the output of the system. It focuses on the input of the system.
6. The variables are adjusted on the basis of errors. The variables are adjusted on the basis of knowledge.

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