DESIGN AND IMPLEMENTATION OF AN AUTOMATIC POWER SUPPLY FROM FOUR DIFFERENT SOURCE USING MICROCONTROLLER

The project is designed to automatically supply continuous power to a load through one of the four sources of supply that are: solar, mains, thermal, and wind when any one of them is unavailable. The four switches represent the four sources. The switches are connected to an 8051 microcontroller of which they provide input signals. Whenever a switch is pressed it shows the absence of that particular source. A relay driver is used that receives microcontroller generated output and switches that particular relay to provide the continuous power supply. A lamp or bulb is used as a load for demonstration purposes which draws power from the main. When the main fails to supply power, automatically the next available source is used like thermal. If thermal fails then the next one is used and so on. An LCD is used to show which power supply is on. Therefore, this project provides an effective solution to provide a platform for alternative power supply during frequent power cuts. In this project, four switches are also used to demonstrate the respective failure of that power supply. The output of the microcontroller is given to the relay driver IC, which switches the appropriate relay to maintain uninterrupted supply to the load. The output shall be 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 like thermal. If thermal also fails it switches over to the next available source. It is not feasible to provide all 4 different sources of supply, one source with alternate switches are provided to get the same function.

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