c) Low Pass LC Filter The archive contains 12 oscilloscope images that capture the operation of a buck

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C Low Pass Lc Filter The Archive Data Set 3 Zip Contains 12 Oscilloscope Images That Capture The Operation Of A Buck 1 (135.63 KiB) Viewed 15 times

c) Low Pass LC Filter The archive <Data_Set_3.zip> contains 12 oscilloscope images that capture the operation of a buck converter supplying a series connected resistive and inductive load with the nominal parameters of 500 and 50mH, with an additional 2200μF capacitor connected across the load resistance to form an LC filter with the 50mH inductor. 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) - Switched Load Voltage across filter and load (v) using P5200 probe @ 500X attenuation. Channel 2 (Green) - Inductor voltage (V₂) using P5200 probe @ 500X attenuation. Channel 3 (Blue) - Capacitor Current (i) using A600 current probe @ 100mV/A. Channel 4 (Magenta) – Inductor Current (i) using A600 current probe @ 100mV/A. • Reference 1 (Orange) - DC Load Current (i) using A600 current probe @ 100mV/A. Analysis: • Using PSIM, draw the circuit topology of the buck 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=0.4) for this buck converter and compare the result with the associated experimental trace. • Extract from the data set measurements of the average load voltage (V.), voltage across the inductor (VL) and average load current (I.). How do the inductor voltage and current waveforms compare to the resistance-inductance case? Plot V, against D. How do these results compare with the theoretical relationship and the resistor only load results? • Extract from the data set measurements of the capacitor current (ic), inductor current (11) and the average load current (I.). Explain how these waveforms relate to each other and confirm that the average value of Ic= 0. Explain this result. • Similarly, plot AiL(p-p) against D. Estimate/determine the value of D for which the ripple is maximum. From your measurement results, calculate the inductance L using: VDc -Vo = Lf For the discontinuous conduction mode (DCM) measurements the duty-cycle is set to D = 0.5, the switching frequency reduced to 500Hz and the load resistance increased to 1500. The voltage across the inductor (VL) and the current through the inductor (IL) were measured, while the duty-cycle (D) was reduced until the current became discontinuous. Extract these measurements from the data set and compare the results with theory. How does this discontinuous transition point change if the switching frequency is increased? • Explain any discrepancies that exist between the theoretical converter responses and the measured data.