Question

Problem 2: A photovoltaic module is used to supply constant 12 V that needed by a Tablet. Depending on insolation from the Sun, the photovoltaic module’s output voltage is changing between 18 V to 36 V (dc).
Thus, a buck converter is used between the netbook and the photovoltaic module.
1) What is the duty ratio range of the dc/dc converter?
2) If the inductance of the buck converter inductor is 40 uH, what is the minimum switching frequency to limit the current ripple in the inductor to less than 1 A?
3) At constant 12 V, what is the minimum power consumption of the Tablet to keep the inductor current always continuous?
4) For the operation condition stated in 3), draw (not simulate and plot) the waveforms of i) switching status, ii)voltage cross the diode , and iii) inductor current; mark the values for each waveform

(please i need solutuon 1_2_3_4)

Answer 1