Non-Isolated Interleaved High Step-Down DC-DC Converter with Reduced Switched Capacitor Stages and Automatic Current Sharing

A high-voltage dc power supply system is an attractive solution for reducing the system cost and improving efficiency. This system needs compact but high-efficiency high-step-down converters to exploit the benefits. This paper proposes a novel converter for a better candidate than traditional converters. The proposed converter is a non-isolated high step-down converter utilizing the switched capacitor technology. Compared to conventional similar topologies, the number of switched capacitor stages can be reduced, enabling the compact converter design. Furthermore, this converter has interleaved output, which can downsize the magnetic devices. The current of the interleaved output is automatically balanced without special control, enabling simple controller implementation. These features were successfully verified by the experiment.