A LnC2n-2 Network-Based Paralleled Dual Buck-Boost Non-Isolated Multi-Output Hybrid Converter with Reduced Leakage Current

This paper proposes a multi-output hybrid converter that utilizes a L <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2n-2</inf> network with a paralleled dual buck-boost converter to supply DC and AC loads with boost voltages simultaneously from a single source. Another challenge faced in non-isolated converters is the presence of parasitic capacitance (CPV) between the solar panel and the surface. A high-frequency power converter develops a voltage across CPV, resulting in a strong leakage current, causing power loss and safety concerns. To address this issue, the proposed hybrid converter and an innovative PWM scheme effectively reduce the leakage current. The L <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2n-2</inf> network is also designed to be expandable, providing the advantage of achieving high gain at a lower duty ratio (d). Moreover, the AC section of the hybrid converter can achieve unity gain at a modulation index (m <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</inf> ) of 0.5, in contrast to traditional topologies where an increase of 0.5 is obtained at m <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</inf> =0.5. This feature allows the converter to attain high gain even with the limitations of m <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</inf> + d ≤ 1 using the same set of switches. To verify the proposed converter, a 200 W scaled-down experimental setup is developed and tested using a microcontroller.