High Power Density Three-Phase LLC DC/DC Converter with Coupled Resonant Inductor and Wye-Delta Transformer for Aircraft Applications

2023 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2023-03-19 DOI:10.1109/APEC43580.2023.10131660

Daniel Ríos Linares, M. Vasić

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Abstract

In applications with a high step-down voltage as in aircraft applications, finding a topology able to achieve high power density and high efficiency while begin EMI-friendly is crucial. Gallium Nitride devices enable high frequency switching, allowing the shrinkage of the magnetic components. The drawback however is the lower efficiency due to switching losses and electromagnetic interference constraints. The focus of this research work is the evaluation of a Three-Phase LLC converter, which, due to its inherent step-down nature (wye-delta transformer), integration capability, low input and output current ripple and high efficiency (ZVS on the entire load conditions), may be a promising solution for a high power density and modular DC/DC converter. Specifications in avionics are very challenging and include a wide input voltage range (235–300 V), a large step-down to the fully controlled 28 V in a half-brick form factor (47 cm3) for a nominal output power of 1 kW leading to a power density of 20 kW/L.

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高功率密度三相LLC DC/DC变换器，带耦合谐振电感和ye- delta变压器，用于飞机

在具有高降压电压的应用中，如在飞机应用中，找到一种能够实现高功率密度和高效率的拓扑结构，同时开始对emi友好是至关重要的。氮化镓器件实现高频开关，允许磁性元件的收缩。然而，缺点是由于开关损耗和电磁干扰的限制，效率较低。本研究工作的重点是评估三相LLC变换器，由于其固有的降压特性(威氏δ变压器)，集成能力，低输入和输出电流纹波和高效率(全负载条件下的ZVS)，可能是一个有前途的解决方案，用于高功率密度和模块化DC/DC变换器。航空电子设备的规格非常具有挑战性，包括宽输入电压范围(235-300 V)，半砖外形尺寸(47 cm3)下的大降压到完全控制的28 V，标称输出功率为1 kW，功率密度为20 kW/L。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

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