外文翻譯---低電壓反激式dc-dc轉(zhuǎn)換器的在電源中的應(yīng)用-在線瀏覽
2024-10-02 17:10本頁(yè)面
【正文】 which are﹢16V and 6V respectively can be regulated pretty well with the input voltage range from 9V to 36V. The voltage tolerance ranges are from ﹢15V to ﹢19V and 12V to 5V, respectively. In addition, the current is also under control, which is around 100mA in this designFigure 1 . Output voltage and current simulation resultsTable 1 . LT Spice simulation resuitsIV. TRANSFORMER SIMULATION RESULTSWith the initial design parameters of the transformer, we use ANSYS PExprt to simulate and further optimize the transformer [4].Figure 2 shows the primary winding voltage. In order to make the transformer work correctly in all cases, it is important to make sure that it can work at the worst case, which is the minimum input voltage in the range. Figure 3 shows the current through the primary winding.Figure 2 . Voltage of the primary windingFigure 3 . Current of the primary windingSince it is a low power converter in this design, it is critical to minimize the power losses. We choose to use the planar type transformer structure. After doing the winding interleaving, the power loss can be reduced by approximately 25% and the temperature rise can be reduced by approximately 15% [5].The structure can be found in Figure 4. The primary winding is marked in yellow, which has 6 turns in series. The first secondary winding is marked in red, which has 3 turns in parallel. The second secondary winding is marked in blue, which has 1 turn. It will be totally 6 layers in the multilayer transformer structure [6].Figure 4 . Winding geometry by interleaving methodBased on the puter simulation, the 6layer planar transformer winding structure can be drawn in Figures 5 10. The primary side winding has 6 turns in series. In Figures 6 and 9, it clearly shows that the turns in different layers are connecting through via hole. In one of the secondary winding which is the +16V one, it has 3 turns in parallel as shown in Figures 5, 8 and 10. The one turn secondary winding (6V) is shown in Figure 7.Figure 5 . Top layer winding structure (secondary 1)Figure 6 . Inner Layer 1 winding structure (primary)Figure 7 . Inner Layer 2 winding structure (secondary 2)Figure 8 . Inner Layer 3 winding structure (secondary 1)Figure 9 . Inner Layer 4 winding structure (primary)Figure 10 . Bottom layer winding structure (secondary 1)The core loss of the transformer is approximately 47mW, paring to the winding loss of 154mW, it i s about 30%, as shown in Figure 11 [7].Figure 11. Power loss o
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