Automatic Power Supply Control to Ensure No Break Power

Abstract

The main objective of this project is to provide uninterrupted power supply to a load, by selecting the supply from any source out of 4 different sources such as mains, generator, and inverter and solar automatically in the absence of any of the source. As we know that the demand for electricity is increasing every day and frequent power cuts is causing many problems in various areas like industries, hospitals, offices and houses which are necessary to be prevented. An alternative arrangement for power source must be used. This project uses four switches to demonstrate the respective failure of that source of supply. A microcontroller of ATmega328 family is used. The output of the microcontroller is given to the relay driver IC, which switches appropriate relay to maintain an uninterrupted supply to the load. When any of the switches is pressed it shows the absence of that particular source. Switches are connected to microcontroller as input signals. The output is observed using a lamp drawing power supply from mains initially. On failure of the mains supply (which is actuated by pressing the appropriate switch) the load gets supply from the next available source, say an inverter. If the inverter also fails it switches over to the next available source and so on. The current status, as to which source supplies to the load is also displayed on an LCD. As it is not feasible to provide all 4 different sources of supply, one source with alternate switches are provided to get the same function.