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

Abstract

This paper proposes a multi-output hybrid converter that utilizes a LnC2n-2 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 LnC2n-2 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 (mi) of 0.5, in contrast to traditional topologies where an increase of 0.5 is obtained at mi=0.5. This feature allows the converter to attain high gain even with the limitations of mi + 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. © 2024 IEEE.