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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 54923 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Kaboli, Shahriyar
- Abstract:
- High voltage DC-DC converters are widely used in a variety industries. In these converters, the function of the step-up transformer is to provide a high voltage at the output. Increasing the power density in these converters has always been the researchers' focus. One of the most efficient ways to increase power density is to increase the switching frequency. In high-voltage step-up transformers, we can decrease transformer size by increasing switching frequency, but electric field strength and insulation issues put a lower limit on transformer dimension. Various winding methods address this issue and aid in achieving higher power densities at high operating frequencies. This thesis compares the conventional winding structures in terms of insulation and power density and proposes a PCB-based winding structure to overcome the disadvantages of these structures.In these transformers, increasing the operating frequency increases the insulation stress between their windings and makes it challenging to deal with their insulation design. It also reduces the efficiency of the windings and cores due to increased losses. PCB-based windings have large parasitic capacitance due to larger overlapped areas and lower dielectric thickness between traces. This thesis presents suitable solutions to solve the mentioned challenges and proposes an optimal plan for constructing a transformer with an output voltage of 4 kV, power of 160 watts, and a working frequency of 100 kHz.
- Keywords:
- Printed Circuit Board ; High-Voltage DC-DC Converter ; High Voltage Step-Up Transformer ; Insulation Considerations ; Switching
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