Question

Following figure shows the circuit diagram for a buck-boost converter for switch off and switch on. The plots for inductor voltage Vl and inductor current iL are also shown. The average value of i, is denoted by I1, average output current is -l and average input current is ld. Similarly, the average value of u1 is denoted by V1, output voltage is-, and input DC voltage is Va. Time period of the switch is Ts 1/f and its duty cycle is D. Inductance of the inductor is L and capacitor is large enough to provide a constant output voltage. -Vo) toft) ton UL UL (b) switch off (a) switch on The value of Io at the boundary of continuous and discontinuous conduction for the above converter is given by oB- f 20kHz. If the input voltage of this converter can vary between 10V to 30V, and output voltage needs to maintained at 20V with lo 2 0.1 A, then find the minimunm value of L which can keep the converter operating in continuous conduction mode Hint: Minimum value of L is obtained when the converter operates at the boundary of continuous-discontinuous conduction, and D and Io are at their minimum values. Suppose the converter is operating at 2L

Answer 1

TNen that ro BuekBoost coaverter the ie. -D Suit 253 :0.666 2 fox-ㄧㄚ 3.ov 20 30 3

Hor hmun value indutaneL and cluty Yatio 's also minimum value-Je Should Consideitdl SO 2 그L min min illi henrits.
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