Design a single-ended primary inductance converter (SEPIC) for charging batteries at 27.5 V from a solar panel that produces a range of voltage from 16V to 34V. Assuming the batteries have a constant resistance R of 60Ω, design the SEPIC with continuous current and a switching frequency of 1400 Hz. The allowable output voltage ripple is 4%.
a) Show all the design steps and circuit diagram to obtain the inductor value for L1, L2, C, and C2. (12 marks)
b) Convert your solution into an Excel worksheet. (4 marks)
c) At time (1-D)T to T, energy generated from the solar panel is not harvested by the SEPIC. Suggest how to harvest the energy at time (1-D)T to T. (4 marks)