High-Performance Front-End Converter for Avionics Applications 3 UDQHHW $ WKDO \ H ' UDJDQ 0 DNVLPRYLü 5 REHUW ( ULFNVRQ

Front-end converters of future 400 Hz aircraft power systems will be expected to meet rigorous specifications, including low total harmonic distortion (THD<10%) and low electromagnetic interference (EMI), with small size and high efficiency. This paper identifies an active-clamped isolated SEPIC converter suitable for such applications. Zero-voltage-switching accomplished by the active clamp and a single-layer transformer design boost the converter efficiency to 90%. An accurate averaged switch model is developed for this converter which shows that its dynamics are simpler than that of a conventional SEPIC and thus better suited for closed-loop controller design. THD of less than 5% has been achieved with average current control.

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