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Comprehensive Optimization and Design a Telecom Charger with Wide Band Gap Devices

Karimi, Siamak | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51771 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad; Nasiri-Gheidarik, Zahra
  7. Abstract:
  8. Nowadays high efficiency and power density are desired for designing a power electronic converter. Technology advances in power semiconductor devices, makes it possible to design converters for operation in higher frequencies to reduce size of the converters. As the frequency is increased, switching losses and temperature is also increased, so designing a converter for high frequency operation needs some tradeoffs. LLC resonant converter as a promising solution for battery chargers has ability to adjust its output voltage during Constant Current and Constant Voltage modes. However, its operation mode would change based on switching frequency change. Therefore, for efficiency-oriented optimizations in battery charger applications, the one-pointed efficiency is not an appropriate objective. To this end, in this project, a multi-pointed averaged efficiency is considered for optimization along with the transformer. Another factor of a proper design for wide output range LLC is the converter peak voltage gain that is calculated based on accurate method. The efficiency calculations are carried out by using time-domain-based analysis for every operation points. Regarding dead-time, a worst case is realized during the charging profile. At last, a 500W 400V:48V GaN-based battery charger is designed with this procedure, and implemented
  9. Keywords:
  10. Direct Current to Direct Current (DC to DC)Converters ; LLC-LC Resonant Converter ; Wideband Gap Transistor ; Optimization ; Matrix Planar Transformer ; Synchronous Rectifier ; Multiobjective Optimization ; Zero Voltage Switching (ZVS)

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