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| A Partial Power Type Four Switch Buck-Boost LCLC Resonant Inverter for High-Frequency AC Distribution System |
| Zeng Jinhui1,2, Bao Zanjin1, Sun Zhifeng1, Lan Zheng1, Chen Yankun1 |
1. School of Traffic and Electrical Engineering Hunan University of Technology Zhuzhou 412007 China;
2. School of Intelligent Manufacturing Hunan First Normal University Changsha 410002 China |
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Abstract High-frequency AC power distribution systems (HFAC PDS) are widely used in aerospace, military equipment, and new energy vehicles for high power density, system miniaturization, and reduced weight. The high-frequency inverter serves as the core interface to the HFAC bus, converting DC power into high-frequency AC and feeding it into the distribution bus. Existing single-stage resonant inverters generally lack sufficient voltage regulation. Although two-stage resonant inverter topologies can expand the input voltage range, they suffer from reduced efficiency because the energy must undergo two complete conversion processes within the circuit.
To simultaneously achieve both high efficiency and wide voltage regulation, the concept of partial power converters has been proposed and widely adopted in DC-DC converters in recent years. The circuit architecture of a partial power converter primarily combines a resonant converter with a non-isolated converter. Hence, the resonant converter operates at its resonant frequency to deliver most of the power with the highest possible efficiency. Furthermore, a non-isolated converter is employed to achieve wide-range voltage regulation for the overall system while handling a small portion of the total power. The core principle of the partial power converter is to reconstruct the original single power path of a converter into two distinct power paths using different circuit types that work synergistically, thereby achieving the dual objectives of high efficiency and a wide voltage range.
In this work, a full-bridge LCLC resonant inverter is integrated with a four-switch Buck-Boost (FSBB) converter, and a novel four-switch Buck-Boost LCLC resonant inverter with partial power-processing capability is proposed. In this way, the majority of the power flows directly through the full-bridge LCLC resonant inverter unit. The proposed inverter operates at its resonant frequency, ensuring highly efficient system operation. The FSBB unit processes a small portion of the power. By adjusting the duty cycle of the FSBB stage, the overall system's output voltage can be regulated over a wide range. Additionally, to reduce system cost, the FSBB unit and the LCLC resonant inverter unit share a common bridge arm. The circuit's operational modes and its power transfer characteristics are analyzed, and quantitative mathematical models for the system's voltage gain and total harmonic distortion (THD) are derived.
Finally, a 250 W prototype of the four switch Buck-Boost LCLC resonant inverter was constructed and tested. The experimental results demonstrate that the proposed converter can operate stably over a wide input voltage range of 30 V to 60 V while delivering a high-quality output voltage, with a measured THD of less than 2%. Concurrently, all switching devices reliably achieve zero-voltage switching (ZVS), thereby reducing switching losses. The system achieves a peak efficiency of 95.1%, surpassing most existing resonant inverter solutions.
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Received: 17 September 2025
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2026, Vol. 41 
