Question

1) A buck chopper like that in Figure I has the following data 250 μΗ, D E 40 V, T Find: 50 μ. L 0.4, C-60 μF, and R 10 Ω. ) the value of L necessary for the continuous current mode (b) Vc (c) Imax and Imin (d) Av r like that in Figure 1 requires an output power of 100 at an output voltage of 24 V from a 60-V supply. The switching fre- quency is 60 kHz. The permitted value of AVc is 0.15 V. Find values for D, L, and C assuming L is three times as large as required for con- tinuous current 3) A buck chopper operates with a source that varies from 50 V to 70 V., The output is 200 W at 30 V. Assuming a switching frequency of 6o kHz, design the remaining elements so that L is just large enough to maintain continuous current under all conditions and without ΔVc exceeding 0.1 V A boost chopper like that in Figure 2 has the following valuess Find (a) the value of L necessary for the continuous current mode (b) Vc (c) Imax and Imin (d) ΔΥο FIGURE FIGURE 2 FIGURE 3

Answer 1

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