正激变换器磁性元件的设计（Design of magnetic components in forward converter）.docVIP

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正激变换器磁性元件的设计（Design of magnetic components in forward converter）.doc

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正激变换器磁性元件的设计（Design of magnetic components in forward converter）

正激变换器磁性元件的设计（Design of magnetic components in forward converter） Design of magnetic components in forward converter In addition to the transformer, the forward transformer has an inductor, that is, a choke. General information is from the beginning of the transformer, but I think it should start from the beginning of the inductor is relatively good, so that relatively clear, thinking can be relatively clear. Because forwardconverter originated in the BUCK converter, BUCK converter, the power is the heart of inductor. Therefore, the power of heart forwardconverter is choke, not only responsible for the variable voltage transformer, transformer, and no other function, power transmission depends on inductance. Of course, the books from the transformer date, is also not a bad idea, but it is not very clear ideas, is not easy to let the reader understand. Below I demonstrate my algorithm, hoped that can help to the reader. Inductor design Firstly, the filter inductance is taken as the object of study. In one cycle, when switching the filter inductor is coupled to a voltage, the current is not abrupt, but linear rise, with the formula I=V*TON/L, these are incremental, the inductor current input voltage, the opening time, inductance. This voltage is emitted from the secondary side of the transformer. When the switch is off when the inductor voltage to a constant discharge, the current decline is linear, also comply with this formula, namely I=Vo*TOFF/L, a cycle, the discharge current is equal to the charging current, so the two are equal, then the 1-D instead of TOFF, D instead of TON, and Vo=V*D from type two. Draw the voltage and current waveforms at both ends of the inductor as shown below. The SHAPE MERGEFORMAT inductance voltage current waveform There is a current waveform, and a voltage waveform. So the first step I designed was to determine the waveform of the primary side current. The first step is to determine the charging voltage of the inductor. First of all, to