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Dual Active Bridge (DAB) topology performs very well for converter output/input ratio close to transformer ratio. However, if a considerable deviation from the transformer ratio is required the conversion efficiency drops significantly. The approach presented in this paper uses variable AC link reactance to improve the DAB performance during operation at light load. The variable reactance is obtained...
High-frequency, high-power transformers are becoming of increasing importance. Such transformers often use foil windings because of their superior thermal properties. Transformers in resonant converters require a specific leakage inductance. The specific leakage inductance value can be obtained by implementation of so called leakage layer. The leakage layer might not influence only the leakage inductance...
A converter concept in the multi-kilowatt class with a high power density being the main goal is presented. High power density is achieved by implementing: ZVS, quasi-ZCS topology and integrated thermal and electromagnetic design. ZVS, quasi-ZCS topology reduces switching losses of IGBT switches and hence improves converter efficiency at high frequencies. Integrated thermal and electromagnetic design...
The paper describes a method for reducing the winding losses and for tuning the leakage inductance of transformers with foil windings. A new way of interleaving foil windings called "partial interleaving" is used to adjust the profile of the magnetic field. This results in relatively low field intensity and hence low eddy current losses in the windings. The partial interleaving is mainly...
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