Influence of parasitic parameters on electrical stress of high frequency transformer

Power electronic transformer (PET) or solid state transformer (SST) is regarded as "energy routers" for the application in new energy power transmission, distributed power energy and electric vehicle It has gradually become a research hotspot due to its high efficiency and flexibility for power control. Among them, the high frequency transformer (HFT) used as a key component in DC-DC converter can generate parasitic parameters to affect the HFT electrical stress. The increase in working frequency can effectively reduce the volume of transformer However; the influence of parasitic parameters closely related to structure, material and layout of HFT become more and more seriously on DC-DC converter performance at high frequency, such as several tens of kHz. This paper provides a simulation study about the influence of parasitic parameters on the electrical stress of HFT under different working conditions. A typical HFT with the rated power of 10 kW was used for obtaining the possible parasitic parameters. The DC-DC converter includes the 20 kHz HFT was simulated considering the parasitic parameters. They can affect the voltage and current waveforms of the windings, especially for the dV/dt and dI/dt regions, which are discussed in this paper.