7 Step Automatic Stabilizer controller card

A voltage stabilizer is a device which stabilizes the AC voltage and keeps it between 200V to 245V AC. 

Sometimes a variation of voltage or spikes appear on an AC line, if we use a voltage stabilizer then the extra high voltages or 

low voltages can cause no problem to the appliances. It protects any electronic device connected to it from getting damaged. 

Automatic voltage stabilizer is very good example of power electronics projects.

Different varieties of voltage stabilizers are present in the market. But we can also make them at home according to our needs and 

requirements.

voltage stabilizer important points

Before building this controller card, the following points and specifications should be kept in mind so that the device we build 

can work properly and give us/you the desired results:

The main feature of our stabilizer is that it can perform for range of input voltage that vary from 60V to 310V, 90V to 440V & 140V to 500V.

The range of output voltage will be maintained 200V to 240V and further it can be customised as per your/customer requirments.

There should be no change in the waveform or the frequency of input/output voltages.

A total of 5 relays are used in the circuit and its auto transformer has 5 or 6 additional tappings 

Automatic voltage stabilizer working

The microcontroller generates the control signals and five relays are used with the autotransformer for the control and conversion of 

voltage. The input voltage is sensed by the microcontroller and it tries to keeps the output voltage between its specified ranges, by 

switching the relays. Out of the five relays, two of them switch the connection between the tappings 5 or 6 , one switches the output 

connection between the tappings 215 and 240 while the last one is a master on/off relay which disconnects the output in case of low 

and high cut modes. Relay interfacing with micro-controller is very easy.

This is the photo of circuit which is currently running in market on my source codes , Micro controller used in this circuit can be changed as per your requirment.

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