1.0 Introduction
Automatic Voltage Regulator (AVR) is a device which is used to regulate or stabilize electrical power supply for electrical and electronic appliances. This device is used to keep the voltage level from public power supply system constant i.e. between 110V to 260V which is the minimum and maximum range respectively. It regulates the supply voltage to produce a constant output voltage of 220V
This device also serves as a protective device for our appliances connected directly to it, while the automatic voltage regulator (AVR) is connected direct to the power supply. The protective system in automatic voltage Regulator (AVR) works in such a way that if there is an excess current or over voltage (voltage surge) from the public power supply, the AVR will either regulate or stabilize the voltage to 220V output for our appliances or the fuse in the AVR will rapture by excess current of the surge and thereby cut-off the incoming power supply.
The stabilization and regulation is achieved through the control circuit which includes relays and the 24x2V which is from the secondary winding of the auto-transformer used for the construction.
This control unit does the work of cut and boost in the case of higher and lower voltage respectively. If the supply voltage drops below 220V down to 180V, the primary control does the work of boast which will bring the output to normal 220V while if the voltage increases above 220V up to 260V, it does the work of cut. The coil of the relays is triggered by 24V D.C.
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