Ultra-High Voltage Boost Converter using Multistage Topology

Abstract

This paper presents an Ultra-High Voltage Boost Converter using Multistage Topology that achieves ultrahigh voltage gain with minimal power losses. The proposed converter integrates a dual-stage boost converter, a coupled inductor, and a voltage multiplier cell, enabling efficient energy transfer and recycling of leakage energy. The converter ensures continuous input current, reduces voltage stress on power switches, and decreases passive component size. With its high voltage gain, high efficiency, and compact design, this converter is suitable for various applications, including renewable energy systems, electric vehicles, and high-voltage DC transmission systems.

Introduction

The increasing adoption of renewable energy demands efficient power conversion systems, especially high step-up DC-DC converters to manage low-voltage inputs and deliver high-voltage outputs. Conventional boost converters face limitations in efficiency and voltage gain due to parasitic losses and voltage stress on components.

To overcome these issues, advanced converter designs combine techniques such as coupled inductors, switched capacitors, voltage multipliers, and clamp circuits. These improve voltage gain, reduce voltage spikes, lower component stress, and enhance efficiency.

This paper proposes a novel high step-up DC-DC converter topology integrating:

• A two-stage boost converter

• A coupled inductor shared between the stages

• A voltage multiplier cell

• A lossless passive clamp circuit

• Synchronous operation of two power switches

This design achieves ultrahigh voltage gain (>10) and high efficiency (>95%) with reduced voltage stress on switches and a compact, simplified control strategy. The coupled inductor aids high-frequency energy transfer and current division to reduce losses.

Simulation and experimental results using a prototype (250 W, 25 V input, 550 V output) demonstrate:

• High voltage gain and low ripple

• Efficiency around 85-90%

• Controlled voltage stress enabling use of low-voltage switches

• Effective voltage clamping and energy recovery reducing losses

The converter is suitable for renewable energy systems, electric vehicles, and high-power applications, addressing the challenges of integrating intermittent renewable sources into the grid.

Conclusion

In conclusion, the experimental results show that the step-up boost converter using an inductor and a voltage multiplier cell can achieve a high output voltage with relatively high efficiency. The voltage multiplier cell performs well, providing a high voltage gain and efficiency. The output voltage ripple is relatively low, indicating good filtering performance. The experimental results demonstrate the effectiveness of using a voltage multiplier cell in a step-up boost converter to achieve high voltage gain and efficiency. The results also show that the converter can operate efficiently over a wide range of input voltages and load conditions, making it suitable for use in a variety of applications.

References

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Copyright

Copyright © 2025 Alamelu R, Prasanth R, Sakthivel S, Sureshkumar R. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.