Reference no: EM132256263
Question 1: The Circuit Below is a DC-DC Converter with an IGBT active switch operating with a switching period of 2ms, by selecting a unique Pulse-width, you will design a buck-boost convert whose output is unique to you alone. The load resistance is chosen to be 33Ω.
Step 1: Acquiring Your Individual Specification for the Buck-boost converter Stage:
Pulse Widt of clock, V6(ms) = 1. 25 + (last 2 digits of your Valencia ID)/200
Record Your Specifications in the Spaces Provided Below
Frequency, f =
duty Cycle, k=
Step 2: Given that the value of R1 is 10Ω, Design the values of inductor L2 and Capacitor C1 such that the buck-boost converter will be operating in the continuous conduction mode.
Critical Value of L2: Choice of L2:
Critical Value of C1: Choice of C1:
Step 3: Based on your choice of L2 and Filter capacitor L1, calculate the average inductor current after the system reaches steady-state and determine the average output voltage and the peak-to-peak output ripple voltage.
Average Inductor Current, IL2 =
Average Output Voltage, VR1 =
Peak-to-Peak Output Ripple Voltage, ΔVR1 =
Step 4: Simulation of The Buck-Boost Converter: Using Multisim CADENCE or PSPICE, setup the Buck-boost portion of the Circuit in the Figure above. Simulate circuit and print the transient result after steady-state is attained. Print the transient result of the clock V6 and the output voltage VR1 on the same plot and axis. Compare your calculations with the result from simulation in the table below.
Question 2: The circuit below is a series-loaded full-bridge resonant circuit with Bi-directional switches that is to be operated at an output frequency of 5KHz. The switching period of the IGBT switches is 20microseconds, the Resistance R2 at the load is 5Ω. The resonant Inductor L1 is set to be 50µH. Using the average value of your buck-boost output voltage in Question 1 as the value of Vs.
Step 1: Acquiring your Individual Specification for Resonance.
Resonant Frequency, fr(KHz) = 10 - (last 2 digits of your Valencia ID)/20
Calculate the Value of C3 required to tune this converter to its resonant frequency
Step 2: Calculate the response of the DC-AC resonant Inverter.
If the IGBT Turn-off time is 2µs, calculate the circuit turn-off time and the maximum possible frequency, the Damping ratio.
Step 3: Calculate the Peak Output Signal Values
Calculate the time that the load current peaks, the peak of Value of the load current and the Peak-to-peak Capacitor Voltage
Step 4: Simulation of Series Loaded-Resonant Bidirectional Inverter: Using Multisim CADENCE or PSPICE, setup the Resonant Bidirectional inverter of the Circuit in the Figure above. Simulate the circuit and print the transient result after steady-state is attained. Print the transient result of the Capacitor Voltage and the current through the inductor. Compare your calculations with the result from simulation in the table below.
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Calculated
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Simulation
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% Error
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Peak Output Current
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Peak-to-peak Capacitor Voltage
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Circuit Off-time
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Question 3: The Figure Below shows the schematic of the Buck-boost converter in question 1 that is driving the input stage of a Resonant Inverter in question 2. The entire system uses IGBT as active switching devices that are gate-driven by well-defined and nearly ideal clocks. Clock V6 has a switching period of 2ms, while clocks V3 and V4 have a switching period of 20µs. The Buck-boost converter is to be operated in the continuous conduction mode.
Step 1: Simulation of the result of coupling the Buck-boost Converter with the Resonant Inverter
Couple the DC-DC and DC-AC converter that you have designed in question 1 and Question 2; Simulate the circuit and Print the plots of the voltage of Capacitor C2 and Capacitor C3 as well as the current through the Inductor L2 and L1.
Step 2: Comment on the result as well as the Loading effect of the Inverter on the Buck-boost Converter.