Asynchronous and Synchronous Buck and Buck- Boost Converter

Assignment Detail:- 42092 Advanced Power Electronics - University of Technology Sydney Lab - Asynchronous and Synchronous Buck and Buck- Boost Converter Objective 1: To become familiar with asynchronous buck converter- Objective 2: To become familiar with synchronous buck converter, gate drive requirements and dead- time- Objective 3: To become familiar with an inverting buck-boost -IBB- converter- Assessment Part-I: Asynchronous buck-converter: Question 1- Using Table 1, calculate the minimum value of inductance L required to keep the asynchronous buck converter -ref- Fig- 1-a-- operation in a Continuous-Conduction Mode -CCM- under all conditions-   Question 2- Using the calculated value of inductance, model a simple asynchronous buck converter -ref- Fig- 1-a-- in PLECS- Run the simulation -use input voltage of 25V- and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- Question 3- Reduce the inductor size to 1/10 of the pre calculated value and run the simulation and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- What is the difference in waveform compared to Step 2 above- Discuss- Question 4- In step -2- above, reduce the load to 1/10 of the original and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- What is the difference in waveform compared to Step 2 above- Discuss- Question 5- In step -2- above, reduce the switching frequency to 1/10 of the original and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- What is the difference in waveform compared to Step 2 above- Discuss- Synchronous buck-converter: Question 6- Replace the diode with switch to make it synchronous buck-converter converter -ref- Fig- 1-b--- Put complementary signal on the new switch -use a simple NOT gate to generate a complementary pulse-- Show the screenshot of the PLECS model- Question 7- Using Table I and calculated value of L in Step -2-, run the simulation and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- Question 8- Reduce the inductor size to 1/10 of the pre calculated value and run the simulation and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- What is the difference in waveform compared to Step 2 above- Discuss- Question 9- Measure the power loss and efficiency at the rated voltage and power in CCM- Use PLECS- An inverting buck-boost -IBB- converter: Question 10- Rewire the circuit as shown in Fig- 3 to make an inverting buck-boost -IBB- converter- Run the simulation -use input voltage of 25 V- and plot the gate signal, drain-source voltage of the switch, voltage across the inductor and inductor current in a single scope- Question 11- Plot the output voltage vs duty cycle -voltage transfer characteristics- of the switch in Excel- -Hint: measure the output voltage at duty cycle 0-1, 0-2, 0-3, 0-4, 0-5, 0-6, 0-7, 0-8 and plot the output voltage vs duty cycle-- Simulation file Question 12- Submit the PLECS simulation file of each:a- Asynchronous buck dc-dc converter b- Synchronous buck dc-dc converter-c- Inverting buck-boost converter- Attachment:- Advanced Power Electronics-rar

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