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High-Frequency LLC Converter with Narrow Frequency Variations for Aircraft Applications

This paper describes the design and implementation of a compact and high-frequency LLC converter with wide input voltage range (from 220 V to 320 V), output power range (from 250 W to 1.5 kW), high efficiency (over 96 % at full power), high power-density (32 kW/dm3) and narrow frequency variations (15 %). A complete and automated optimization process has been developed, including the comparison between different semiconductor technologies and the design of a Matrix Transformer that reduces the height of this magnetic component. A fully customized converter has been developed using an automated design tool.