A high gain boost converter fed single-phase voltage source inverter with its control for DC to AC power conversion in uninterrupted power supply and renewable energy applications is presented in this paper. The conventional DC-DC boost converter with a coupled inductor and switched capacitor is utilized to obtain high gain. Further, the output voltage of the inverter is controlled by sinusoidal pulse width modulation technique. The detailed design and analysis of high gain boost converter fed single-phase voltage source inverter is also presented. The sine pulse width modulation control scheme for the voltage source inverter is developed and presented. In order to validate the high gain boost converter fed single-phase voltage source inverter, the simulation model is developed in LTspice software environment and results are validated. The results show high gain boost converter achieves a gain of about 10 and the single-phase voltage source inverter is able to provide a rms voltage of 228 V without using the step-up transformer. The total harmonic distortion of output current is found to be reduced below 4%. Further, the results obtained are found to be in close agreement with theoretical values.