Isolated high-frequency dual-active bridge converter based on gallium nitride device

Abstract

The invention discloses an isolated high-frequency dual-active-bridge converter based on a gallium nitride device. The converter comprises a high-voltage three-phase full-bridge circuit module, a low-voltage three-phase full-bridge circuit module, a three-phase energy transfer inductor, a three-phase high-frequency coaxial transformer and a DSP module. The isolated high-frequency dual-active bridge converter provided by the invention is symmetrical and simple in structure, and the electronic power switch adopts a gallium nitride power device, so that the switching frequency of the dual-active bridge converter can be improved to a range of 100kHz-1MHz. The three-phase high-frequency coaxial transformer adopts a coaxial structure, so that the volume and the weight of passive elements are reduced, the electromagnetic interference is reduced, the power density of the converter is improved, electric energy can be transmitted in two directions, and the transmission direction can be quickly switched. According to the embodiment of the invention, high switching frequency and high power density can be provided in an application occasion with strict limitation on volume and weight, and the technical problems of relatively low switching frequency and relatively large volume and weight of a traditional dual-active bridge converter in the prior art are solved.

Description

technical field [0001] The invention relates to the field of power electronic conversion circuits, in particular to an isolated high-frequency dual active bridge converter based on gallium nitride devices. Background technique [0002] Dual-Active-Bridge (DAB) DC-DC bidirectional converter consists of a transformer connected to two H-bridge full-bridge circuits. The full-bridge circuit inverts the DC voltage into a bipolar AC rectangular wave. Two AC voltages are applied to the transformer and inductor to control the magnitude and direction of energy transmission through phase shift control. The dual active bridge DC converter has a symmetrical and simple structure, can realize electrical isolation between two levels, bidirectional energy flow and zero-voltage switching of devices, and is suitable for new energy power generation systems, aviation power systems, DC uninterruptible power systems, electric vehicles Energy management system, multi-port hybrid power supply syste...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an isolated high-frequency dual active bridge converter based on gallium nitride devices, which is used to solve the problem that the traditional dual active bridge converters in the prior art are built with silicon devices, and the switching frequency is relatively low , the technical problem of large volume and weight

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