Abstract
A design procedure for the dual active bridge (DAB) converter is presented, which aims to optimised power density and computational effort. When designing a DAB, the selection of circuit design parameters such as switching frequency, leakage inductance and semiconductor technologies is a complex question when targeting losses and weight minimisation of the final design. In this study, analytical models of the operating waveforms, the losses and the weight of all DAB components are developed. The proposed design algorithm is used for designing a 3 kW high-frequency DAB for an aircraft DC power system.
Highlights
The concept of the more electric aircraft promotes the use of electrical instead of traditional hydraulic, pneumatic or mechanical systems [1, 2]
The advantages are reduced cost, reduced fuel consumption, lower weight and less environmental impact. This results in an increase in the power rating of the aircraft power system and imposes the use of high-voltage DC buses
DC/DC converters will play an important role in the management of electrical power in future aircraft
Summary
The concept of the more electric aircraft promotes the use of electrical instead of traditional hydraulic, pneumatic or mechanical systems [1, 2]. The advantages are reduced cost, reduced fuel consumption, lower weight and less environmental impact This results in an increase in the power rating of the aircraft power system and imposes the use of high-voltage DC buses. The design of the DAB implies the choice of many converter parameters such as switching frequency, leakage and magnetising inductances, semiconductor devices and magnetic materials in order to minimise the total losses and weight of the converter. An efficient design procedure based on analytical modelling of the DAB is proposed and applied to optimise the converter for the highest power density with minimal computational effort. The proposed optimisation technique, visualised, consists of three steps It starts with the calculation of the current and voltage waveforms and other electrical variables of the DAB, e.g. the RMS current.
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