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Assignment 1
1. (30 marks points) You have been asked to design the hardware for DC power sup- ply. The system has an input voltage that can vary from 12V to 32V DC, and you need to create a converter with a constant DC output voltage of 48V in to a 10? load. You will be designing the hardware, you can assume a controller is designed to ensure you have a constant 48V output with varying input. This controller will output a PWM signal of 40kHz.
Next, find a MOSFET and a diode that will work for this build, list your consider- ations for selecting both switches, and calculate the losses for your switching power pole (include the datasheet for each switch in the appendix).
There is an option to switch at a lower switching frequency of 1kHz. How will this alter the losses in your system?
2. (20 marks points) Displayed in figure 1 is the switching voltages across a buck con- verter’s inductor (20mH) which has a switching frequency of 50kHz and an output current of 6A. It is just a screen grab to illustrate the switching, so doesn’t show the accurate duty cycle or voltage amplitudes.
Find the following:
1. Vin
2. Vout
3. ?IL
4. Assuming the load had the ability to vary, what size load will make the converter enter discontinuous conduction mode?
5. What size capacitor would be required to have an output ripple of 1%?
Figure 1: Switching voltage across buck converter inductor
3. (20 marks points) A buck-boost converter can step up or down the input voltage...
Discuss why a buck converter, or boost converter still exist (advantages/disadvantages).