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Design and Implementation of a High-Efficient High-Power-Density Telecom Battery Charger using Planar Matrix Transformers

Nazerian, Emad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51703 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. In creating a telecom battery charger there are three challenging factors which are high power density, high efficiency and modularity. A telecome battery charger consist of a rectifier with power factor correction capability and a DC-DC converter. The power stage of DC-DC converter with high output current and low output voltage has a vital role in the battery charger. The isolation transformer and magnetic component of LLC resonant tank are two huge and heavy parts of the DC-DC converter. With the emergence of GaN and SiC switches pushing frequency to to megahertz is possible which resulted in decreasing the volume of passive divices. But with increasing the frequency, designing of the magnetic devices would be more challenging. Applying the resonant power converter with the planar matrix transformer is a great candidate to overcome the problem. The matrix transformer is defined as an array of some smaller transformer interwired so that the whole functions as a single transformer. Using planar transformer as smaller unit of matrix transformer has several advantages in high frequency, high output current application. In this thesis, a telecom power supply with 200-Watt output power and using both planar transformer and wire wound transformer are built and the results are compared with each others. In the second part a planar matrix transformer has been designed and constructed for a 500-Watt telecom battery charger. This battery charger is a prototype of a high output current application that applied GaN swithes. The result shows the superiority of planar matrix transformer for the high output current, high frequency and high power density applications
  9. Keywords:
  10. LLC-LC Resonant Converter ; Planar Transformer ; Matrix Transformer ; Communication Power Supply ; High Frequency Transformers

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