![]() ![]() In these systems, the reference input gets added with the feedback signal thereby increasing the gain of the overall system.Ģ. Positive Feedback: The type of feedback in a control system in which the input signal and the feedback signal are in phase with each other is known as a positive feedback system. Thus feedback loop is considered as the key parameter of a closed-loop control system.įeedback in any circuit can be generally of 2 types:ġ. So basically feedback acts as the characteristic of the system that allows comparison between achieved output and reference input of a system.Ī feedback is generally a part of the output signal which is given back to the input signal so that the two can be compared and the desired output can be achieved if the present output shows variation with the desired output. But one must clearly know what feedback really means? Till now we have used the term feedback so many times. Thus in this way, the output performs the controlling action in a closed-loop system. This feedback signal and the reference input signal acts as system excitation to get the desired response. Thus in a closed-loop system, a feedback signal is provided to the input. Therefore, once the error is measured then it can be reduced to the lowest possible value in order to get the desired output. This helps in determining the error which is present inside the system. ![]() So, to have the accurate system response the easiest way is to compare the applied input with the achieved output. And in any system, if the measurement is not performed and the required output is not achieved then it becomes almost impossible to get the accurate system response. We all are aware of the fact that the basic requirement of using an electrical or electronic system is to generate the desired output. We know that open-loop systems do not hold the ability to automatically provide accurate output. While in a closed-loop system, the produced output controls the functioning of the system by the used of feedback.īasically a closed-loop system was designed to overcome the disadvantages associated with an open-loop system. This variation leads to give two different categories of control system.Ī system in which controlling action is independent of the generated system output is known as open-loop control system. Now the controlling provided to the system can be either output independent or output dependent. A control system is a system that is designed to produce a specified output by the action of required controlling. We have already discussed in our previous article about the control system. ![]() Closed-loop systems are considered as fully automatic control system because it is designed in a way that the achieved output is automatically compared with the reference input to have the required output. ![]()
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