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Transformerless Polarity Selectable Buck-Boost Converter with Common Ground Somboon Sooksatra

This research work proposes transformerless buck-boost converter with common ground. The proposed converter consists of five switches that can be configured to either noninverting or inverting output (polarity selectable). The proposed converter circuit can function as ordinary buck-boost or noninverting (two-switch) buck-boost converter. The converter gain can be adjusted to lower or higher than unity. The logic diagram for configuring the converter, converter analysis, design and computer simulation to confirm the analytical work are presented in the paper. The paper also shows that the proposed converter circuit is suitable for several industrial applications, such as dc motor servo drive and PWM inverter having common ground with the voltage source. How to implement the proposed converter to power supply and common ground inverter is given in the paper.