Auto Power Supply Control System from 4 Different Sources Using PIC Microcontroller: The auto power supply control system is very convenient system for that consumers who want to attains uninterruptible power supply from different sources such as solar, main, generator and inverter. If we see it at commercial level, then we can estimate that there are so many consumers or customers which have the equipment or machines whose requirements is only uninterruptable power supply. Such as the data base companies whose all work is done on computer then it is required an uninterruptable power supply all the time, otherwise their computer could be off during the time when the load is shifted on another source, similarly the companies which have the data base production machines then it also could be also off during the load shifted then their production can be stop or damage. Concentrating on these above problems we can examine the importance of this auto power supply control system in this modern world. Different peoples and companies are working on this auto power supply control system which are making this system with the help of magnetic contactors and power relays but their system is so much costly and do not provide precise uninterruptible power supply. Here we are making this auto power supply control system with the help of power electronics components, pic microcontroller 18F452 and electronic relays.
Here is the block diagram of the auto power supply control system from 4 different sources using pic microcontroller with all the essential components. The Block Diagram of the auto power supply control system from 4 different sources using pic microcontroller:
Transformer:In this auto power supply control system, the transformer is used for connecting this system directly to the wapda or 220V ac. It steps down the 220V ac into 12V ac .it consists of two winging’s and work on the principle of mutual induction.
Bridge rectifier:In this auto power supply control system, the bridge rectifier is used for converting the 12V ac voltages into dc voltages for supplying the power to the other electronics components.
Voltage Regulator:In this auto power supply control system, the voltage regulator is used for regulating the 12V dc voltages into 5V dc voltages for supplying the power to the LCD display, microcontroller and relay driver IC. In this system LM 7805 voltage regulator is used for regulating the bridge rectifier the voltages.
LCD Display:In this auto power supply control system, the LCD display is used for displaying the thatsource of supply on which the whole system or load has shifted. It also displays the voltage which are coming from current source. It is interfaced with microcontroller and powered up with 5V dc.
Selection Keys:In this auto power supply control system, the selection keys are the basically push buttons which are used for checking the working function of this system. These are pushed up one by one for demonstration purposes.
PIC Microcontroller 18F452: In this auto power supply control system, the Pic 18F452 microcontroller is used for the auto selection of the available source. It shifted the load to the other power supply source automatically without any interruption. It is programmed in c language with help of mikro c software and is powered up with 5V dc voltages. It is interfaced with LCD display and relay driver IC.
Relay Driver:In this auto power supply control system, the relay driver IC is used for driving the load relays. This relay receives the signal from microcontroller for shifted the load on another supply source. It is powered up with 5V dc and interfaced with microcontroller.
Load:In this auto power supply control system, the lamp is used here as an output load for demonstration purposes.
This auto power supply control system works on the principle of auto function for switch over the load to other available source without wasting any time or switch off the load. Here for the demonstration purposes we have used the selection keys for switch off any source of supply. In this system, the microcontroller which is very essential component of this system always, keep sensing the whole available sources. When any source is switched off through the selection keys then the microcontroller shifted the load to the other supply source by giving the signal to the relay driver IC then the relay driver IC switched on the appropriate load relay. The whole function is done by the microcontroller is micro seconds and this shifted time can be changed during the programming of microcontroller. Here 4 load relays are used which are connected in parallel with load and 4 sources of supplies are also connected in parallel with these load relays. These load relays consist of normally open and close contacts and are operated through the relay driver IC. We have checked this system by connecting the lamp at output side as a load when any interruption is take place during the shifted time then the lamp is blinking but here there is no any blinking take place during the shifted time means there is no any interruption in supplying the power at output side.
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