Types of Feedback
There are two types of feedback:
- Positive Feedback
- Negative Feedback
Positive Feedback
The positive feedback adds the reference input, R(s)R(s) and feedback output. The following figure shows the block diagram of positive feedback control system. The output and input signal are in phase with each other , reference inputs are added with this system in the feedback section which increases the gain of whole system.
For the time being, consider the transfer function of positive feedback control system is,
T=G/1-GH
Where,
- T s the transfer function or overall gain of positive feedback control system.
- G is the open loop gain, which is function of frequency.
- H is the gain of feedback path, which is function of frequency.
Negative Feedback
Negative feedback reduces the error between the reference input, R(s)R(s) and system output. The input and output signal are out of phase with each other , so to get the error signal – the feedback signal and the input signal get subtracted , so the gain gets reduce of the overall system.
Transfer function of negative feedback control system is,
T=G/1+GH
Where,
- T is the transfer function or overall gain of negative feedback control system.
- G is the open loop gain, which is function of frequency.
- H is the gain of feedback path, which is function of frequency.
Closed-Loop Control System
In this article, we’re going to discuss about closed loop control system. A closed-loop control system is an electronic device that automatically regulates a system to maintain a desired state or set point without human interaction. The advantages of closed-loop control systems lie in their ability to provide precision, stability, and resilience, making them indispensable in numerous technological advancements and industrial processes. The term “closed-loop” reflects the feedback loop that is established, where the output is fed back to the system’s input for constant monitoring and correction.
Table of Content
- Closed-Loop Control System
- Operation
- Components
- Types of Feedback
- Applications
- Advantages and Disadvantages