FIGURE Q2 shows a light rail transportation application on a DC microgrid system with the input supplies of 750 V.A high efficiency dc-dc converter design which adopted two half-bridge resonant circuits with Zero Voltage Switching (ZVS) is used to reduce the voltage rating and power losses. The dc-dc converter is supplying loads such as battery bank, control power units and communication equipment. On the other hand, AC loads such as AC motor and compressor is supplied through the inverter unit. 750 Voc Conductor Rail Running Rail FIGURE Q2 a. Construct and describe the high efficiency dc-dc converter used in this light rail transportation system. Discuss on how it can achieve high-power density and high efficiency performance. [15 marks] In the system, high-frequency switching is required to reduce the system b. size with the implementation of Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS). Investigate whether it is possible to implement zvS and ZCS in the system and justify your answer. Discuss in detail on the selection of resonant frequency for ZVS and how it achieves the zero voltage during switching. [15 marks]