Answer Happy

b) Three-level Switching The archive <Data Set 5.zip> contains 5 oscilloscope images that capture the operation of a bi-directional H-bridge DC-DC converter supplying a series connected resistive and inductive load with the nominal parameters of 500 and 50mH. The converter is supplied from a variac set through a rectifier to produce a nominal 100V DC link voltage. The measurements shown in these oscilloscope traces are as follows: • Channel 1 (Yellow) - DC Load Voltage (v) using P5200 probe @ 500X attenuation. • Channel 4 (Magenta)-DC Load Current (,) using A600 current probe @ 100mV/A. Analysis: • Using PSIM, draw the circuit topology of the H-bridge DC-DC converter for this operating condition. Show the DC source, the switching devices, the DC load and all measurement locations. Use current and voltage sensor elements for each measurement point. Simulate one operating point (e.g. D=0.25) for this H-bridge DC-DC converter and compare the result with the associated experimental trace. • Extract from the data set measurements of the average load voltage (V.), average load current (L), the magnitude and frequency of the peak-to-peak ripple in the output current (Afo)), and tabulate your results. • Observe the waveforms of v, and i, for D equal 25%, 50% and 75%. Explain the differences between these results and those from two-level switching. • For the two-level and three-level switching strategies, compare the recorded values of the output current ripple magnitude and frequency. On that basis, identify which strategy produces a better result. • Explain any discrepancies that exist between the theoretical rectifier responses and the measured data.