ELE 754 Final: ELE 754 Fall 2016 Final Solution
31 Jan 2019
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The formula sheets are provided with this book. Do not write your answers on the formula sheets: if the space is not enough, please write on the back of the page, show details of calculation steps. For three-phase circuits, all the voltages are line-to-line voltages unless noted otherwise: read the questions carefully! Part of questions mayor may not be related. A boost converter is shown in figure 1. The output voltage is 12v to drive the led backlight of a lcd screen. Answer the following questions when the converter is operating in steady state with full brightness. Figure i boost converter drives the led backlight. 1. 1) find the boundary current and determine the operation mode. 1. 3) using following template, draw the waveforms in steady state. 6: the inductor current il, the diode current id , and the filter capacitor current, ic . b. ~\81 i"~ 1. 1ij. I~ 1"4 ~/~{ ~~: j!f3 f. -- 2 ;::.
