Development of Transformerless Switching Mode Power Supply System for PMU Devices

In this paper, we used transformerless voltage step-down operation to build an SMPS, which made our circuit smaller and lighter as well as we could get rid of the disadvantage of transformer (loss and heat issue) in power supply. Multiple outputs with positive and negative voltage from a single source were achieved according to the need of the PMU device. For reducing the circuit complexity we used a switching regulator IC to step down DC voltage. This work has developed, modeled, and implemented multiple novel approaches. The results are analyzed and documented for the research community.