Non-isolated common-grounded high step-up DC-DC converter with continuous source current suitable for low power...

Area of Science:

• Electrical Engineering
• Power Electronics

Background:

• Low-power applications require efficient DC-DC converters with high voltage gain.
• Existing converters often face challenges with high voltage stress and complex control.
• Switched-capacitor and dual-switch topologies offer potential for improved performance.

Purpose of the Study:

• To propose a novel non-isolated high step-up switched-capacitor dual-switch DC-DC converter.
• To achieve high voltage gain with reduced voltage stress on components.
• To ensure straightforward control and high efficiency for low-power applications.

Main Methods:

• Detailed steady-state analysis in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM).
• Loss and efficiency analysis, including device design procedures.
• Modeling using average state-space and small-signal analysis.
• Verification through simulation and experimental results.

Main Results:

• Achieved a voltage gain of 10 at a 50% duty cycle.
• Demonstrated low per-unit voltage stress on switches (20% and 40%) and diodes (67%).
• Exhibited continuous input current and a common-ground point.
• Showcased straightforward control due to only two operational modes in CCM.

Conclusions:

• The proposed converter offers a competitive solution for low-power applications requiring high step-up voltage.
• Its design provides a balance of high efficiency, low component stress, and simple control.
• The interleaved structure effectively reduces input current losses.