Question

I want to solve this problem step by step

1. (35 points) Switch mode DC / DC Converters. a. (15 points) Design a flyback DC/DC power converter to the following specifications. Assume ideal components. Input Voltage Output Voltage Output Power Switching frequency Maximum Current Ripple in the filter inductor Output ripple voltage: Continuous conduction 170 VDC 12 VDC 40 Watts 750 kHz 1.2 Amps Your answer should include a circuit diagram with each energy storage element labeled with its value. Label the transformer turns ratio. b. (10 points) The turn on drain current and the drain-source voltage of a MOSFET in a Boost Converter is shown in Figure 1. Reverse recovery of the circuit's diode causes the apparent overcurrent in the MOSFET Define turn-on as occurring between 0 ns and 120 ns as shown in Figure1. Find the energy lost in the MOSFET during turn-on. ic (Amps) VcE (Volts) 20 -__ 17 I -300 V I 0.30 V 0 85 120 Time (ns) 0 100 Figure 1. Turn-on characteristics of a MOSFET. c. (10 points) Describe the most significant problem that you encountered in designing or building your DC/DC converter project this semester. The grade on this problem is for the quality of your description, not the nature or identity of the problem.

Answer 1

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