Top 10 Examples of Closed Loop Control Systems [Practical Applications]

The design of closed loop control systems is comparatively more complex than open ones. Such system takes feedback from outut and performs the required action accordingly. The entire construction requires a sensor for taking input, some sort of controller which performs the action and a feedback taken from the output. Given below are 10 examples of closed loop control systems.


Thermostat Heater

The thermostat heater is an example of closed loop control system. The thermostat senses the temperature of the system and maintains the temperature.

Thermostat heater
Input Temperature
Plant Heater
Controller Thermostat
Output Temperature

Sunseeker solar system

Sunseeker solar system is an automatic tracker which uses LDR to sense the sunlight. A microcontroller reads the LDR voltage and signals the connected motor which rotates the panel towards the sun.

Sunseeker solar system
Input Sunlight
Plant Solar Panel
Controller µC
Output Position change

Voltage stabilizer

The voltage stabilizer stabilizes the supply voltage in case of fluctuations. Modern voltage stabilizers utilize solid state electronic components which measure the fluctuation in voltage and reduce/increase (buck/boost) the voltage to the desired level.

Voltage Stabilizer
Input Voltage
Plant Stabilizer
Controller Electronic Circuit
Output Voltage Buck/Boost

Missile Launcher

A missile launcher detects the position of the plane using radar tracking unit and then

Voltage Stabilizer
Input Position
Plant Launcher
Controller Computer system
Output Target

Auto Engine

The tachometer in auto engine generates a voltage proportional to the speed of the shaft. The voltage is subtracted from the input voltage to calculate an error voltage that provides information about current speed and desired speed. The error voltage is then used to arrange the throttle after amplification.

Auto Engine
Input Desired speed
Plant Auto Engine
Controller Cruise system
Output Change in speed

Inverter AC

The inverter air conditioner uses an inverter for controlling the compressor speed. Sensors measure the ambient air temperature and then adjust compressor to the required level.

Inverter AC
Input Temperature
Plant AC
Controller Inverter inside VFD
Output Change in speed

Automatic toaster

The automatic toaster measures the temperature, moisture vs dryness level of toast and adjusts the heat setting of toasts.

Automatic toaster
Input Moisture level
Plant Toaster
Controller Heat setting circuitry
Output Heat level

Turbine Water Control System at power Station

In modern hydroelectric power stations, the level of water coming from the nozzles and gate is adjusted using automatic controls.

Turbine water control
Input Flow rate of water
Plant DAM
Controller Governor sets
Output Change of flow rate

Automatic Clothes Iron

The automatic clothes iron adjusts the required temperature for proper pressing.

Automatic clothes iron
Input Temperature
Plant Iron
Controller Heat elements
Output Temp adjustment

A human traveling on the road

The human body itself is the perfect example of closed-loop control systems. He looks around for traffic and changes his position accordingly.

Human traveling on the road
Input Information about surrounding
Plant Human
Controller Brain
Output Position adjustment

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