Multi-Power Supply Using 4 Different Sources for No Break
Power Supply
The project is designed to automatically supply continuous power to a load through one of
the four sources of supply that are: solar, mains, generator, and inverter when any one of
them is unavailable.
Four switches are used for four respective sources. These are connected to a
microcontroller of 8051 family that provides input signals to it. 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 continuous
power supply. A lamp is used as a load for demonstration purpose which draws power from
main. When main fails to supply power, automatically next available source is used say
inverter. If inverter fails then the next one is used and so on. An LCD is also used to display
which source is being currently used for power supply.
Therefore, this project provides an effective solution to provide an alternative power supply
during frequent power cuts. In this project uses four switches to demonstrate the respective
failure of that power supply. When any of the switches is pressed it shows the absence of
that particular source, switches are connected to microcontroller as input signals. A
microcontroller of 8051 family is used. The output of microcontroller is given to the relay
driver IC, which switches 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, 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 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.
