A novel interleaved nonisolated high gain DC-DC boost converter based on voltage multiplier rectifier

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Efficient DC-DC voltage conversion is critical for integrating renewable energy sources and managing power in DC microgrids.
• Existing boost converter topologies often face challenges with high voltage gain, input ripple, and component stress, limiting their applicability.
• Transformerless designs are desirable for reducing size, cost, and electromagnetic interference (EMI) in power electronic converters.

Purpose of the Study:

• To propose and analyze a novel interleaved DC-DC boost architecture incorporating a voltage multiplier rectifier (VMR) circuit.
• To investigate the converter's design methodology, operational characteristics across different duty cycles, and performance metrics.
• To demonstrate the suitability of the proposed converter for applications such as energy storage, electric transportation, and renewable energy integration.

Main Methods:

• Detailed examination of the converter's two-phase interleaved boost stage and the subsequent VMR stage.
• Analysis of steady-state behavior, voltage gain characteristics under ideal and non-ideal conditions, and power loss calculations.
• Simulation of a 25V to 270.5V voltage conversion and experimental validation using a laboratory prototype.

Main Results:

• The proposed interleaved boost converter achieves a high voltage gain with significantly reduced input voltage ripple.
• Maximum efficiency of 96% was recorded at 100W output power, confirming the effectiveness of the interleaved operation and VMR.
• Simulation and experimental results validated the theoretical analysis, demonstrating high accuracy and reliability of the converter's performance.

Conclusions:

• The proposed transformerless interleaved DC-DC boost converter with VMR offers a cost-effective and efficient solution for high-voltage gain applications.
• Interleaved operation enhances EMI performance and extends source lifespan, while the VMR circuit achieves high DC output voltage.
• The design's low switch stress and minimized size/cost make it ideal for renewable energy systems and DC microgrids.