Two Switches Common Grounded Transformerless Step-Up and Step-Down Inverter

This paper proposes a novel single-phase stepup/step-down inverter topology based on two active switches with a common grounded feature. The paper approaches the topology derivation from the differential Boost inverter. It is proposed a static linearization to reduce output voltage distortion which is derived and presented. A prototype rated on 250 W, 100 kHz, 100 V input voltage, and 155 output-peak-voltage boost inverter is designed and verified, achieving 91,04 % efficiency and 11,57 % total harmonic distortion (THD) at full load obtaining 15.78 % THD reduction in comparison to the full load operation with no static linearization. The results demonstrate the viability of the proposed topology for applications and highlight its potential for further performance improvements and increased efficiency.