Uninterrupted Multi-output DC-AC Power Supply with Independent Output Voltage Regulation

In this article, a method for single-phase multi-output uninterrupted power supply (UPS) has been presented with both direct current (DC) and alternating current (AC) outputs. Typically, a DC-AC UPS consists of a rectifier, a battery, and an inverter. In the proposed work, AC output is taken out from the inverter and a DC output is taken in parallel from the load side of the boost converter. In this study, the circuit is composed of an extra circuit component called a DC-DC boost converter. In a typical DC-AC UPS, usually, the input supply is from the battery, but in the presented work, a DC-DC boost converter’s output is used as the supply to the inverter. Booster has been used in the model to amplify (up to 2.5 times) the output voltage of the battery without any change in the power. Booster provides more input voltage (DC) to the inverter than the battery alone could deliver. A sine pulse width modulation scheme is designed and developed to control the inverter switches. A single-phase step-up transformer has also been practised to achieve the desired output level from the inverter. In the present work, MATLAB/SIMULINK is being used for the simulation purpose of this model.