| ABSTRACT |
Uninterruptable power supply(UPS) sits between a power supply such as wall outlet and devices to prevent undesired feature that can occur within the power source such as outages, sags, surges and bad harmonics from the supply to avoide a negative impact on the devices. This product presents a photovoltaic(PV) powered UPS using microcontroller PIC16F628A-I/P. It is a standby UPS whereas if the main power source fails to supply power to loads, a battery powered inverter turns on to continue supplying power. The inverter is three-level which its maximum voltage angle can be controlled by the PIC microcontroller, therefore the optimum maximumvoltage angle and the lowest current total harmonic distortion (CTHD) can be obtained. The battery is charged by the PV using slar charger and transfer switch controlled by the microcontroller.
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