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ELEC9711 Assignment
You are required to submit this hand-in assignment for ELEC9711. The mark from this assignment will contribute to
10% of your final class mark. You are expected to submit this hand-in assignment using a PDF file via the
Assignment 2 link on the ELEC9711 Moodle page before 3pm on the Friday of week 6 T3 2022. Late submissions
will not be accepted. You must include a signed cover sheet declaring that the work submitted is your own work and
this must be the first page of the assignment: it is available on the OpenLearning site alongside this assignment.
For the resonant ZVS DC-DC converter of Figure 1, the inductor L and capacitor C are sufficiently large so
that current and voltage may be considered to remain constant during a switching period respectively.
The following parameters are given:
20 VdV = , 1.5 HrL = , 0.05 FrC = , 11 VoV = , and 4 AoI = .
(a) Please calculate out the required switching frequency for the above design.
[2 marks]
(b) Sketch the waveforms for iLr and vCr with respect to the switch status and clearly describe the resonant
process. With the aid of your waveforms, show why the resonant circuit can help lower the loss in the
switch.
[3 marks]
(c) Can we use the same Lr and Cr values for a ZCS converter design to operate with the given input and
output V&I ratings? If yes, what is the required switching frequency? If not, please explain why it
won’t work and find a new value for Cr that could fix the problem (same V/I/fs values). [Typically, you
should sketch the waveforms for iLr and vCr with respect to the switch status and time to explain this.]
[3 marks]
(d) What can you reflect on the differences between the waveforms and applicable conditions of ZCS and
ZVS? In addition to the rule of t3 < ts, what are the new rules you can summarise from the above
analysis that ZCS and ZVS converters should comply respectively? [Please relate the values of Z0, Vd,
and Io to the waveforms you have drawn for t1-t2 to answer this.]