and that's great.
You can see for example this start of the five
volt operating point is 0.9 milliseconds.
The end of that is 1 millisecond.
And that for the converter that is switching at 100 kilohertz is exactly 10 periods.
And we have such time start and end defined for
the operating point two and the operating point three.
Right, let's look at the results.
The vout_5v, that is supposed to be the average value of the bus voltage at
the operating point one, it should be 5V +/- 0.1V but
our result is far from that because we have a boost converter
that's not enable to produce or reduce the voltage to 5 volts.
And so this is not good, and here we will earn 0 points.
Now the second operating point,
we want to be between 20 +/- 0.1,
and our result of 20.0082 is great.
And so, we're going to earn 5 points right here.
Now we also check ripples over the same steady state time intervals,
but we do that only at the operating point two.
And so we have the input voltage ripple, that's right here,
it's supposed to be less than 0.1 volt.
What is it?
Well we have 0.112, so it is greater than what is allowed.
And so, we would earn 0 points here as well.
That simply means our input capacitor is too small.
On the output side, however, our ripple meets the requirement and
so we will earn five points for that.
Now, the next line checks the maximum flux density through the inductor.
In this case here, we have just one inductor and so
there is just one measurement line.
If you had more inductors, you need to have multiple measurement lines, one for
each inductor.
The maximum flux density in steady state operation
at operating point two is found to be about 0.2 Tesla,
that meets the requirement of less than 0.33 Tesla,
and so we earn five points for that rubric.
And finally, that is a calculation of efficiency.
It's automated.
So efficiency is calculated as output power over input power, at
the operating point 2.
And the result obtained is 96% for
the boost example; that 96% is a good result,
and that will actually earn full 10 points in the rubric.
You will see the rubric for efficiency actually has several different values.
The higher the efficiency you have, the larger number of points you will earn.
The final point is the check whether the charging current
from the USB bus at the operating point 3 is 3 amps plus minus 0.1 amp.
If you look at the measurement result and you see that's okay and
you earn points for that rubric.
So this is just an example of how the grading is going to go,
but again, this is also a very good guide of how you can
check your design before you submit your work for grading.
And finally, a couple of important notes on submission of your work and
for peer grading.
An important point is, you will be allowed to submit your work only once.
So, make sure that everything is correct and
complete before you click the submit button.
Why is that?
Well, it is related to the fact that these works are going to be peer graded
so there has to be a point where the submission is available to other
learners to look at, and you cannot make updates after that,
after someone has already started looking at your design.
So bear in mind that you will only be allowed to submit once.
And again, make sure that everything is fine and
correct before you click on the submission button.
As I already mentioned, it is very important to very carefully
review the rubrics in the Milestone1 document.
Rubric can be used through the entire design process to make sure that
you're meeting all the design requirements,
and you can actually score yourself, and
have a good expectation of what scores you should expect from your peers.
You will be asked to submit your work and
simulation files to be evaluated by peer graders.
When you prepare your simulation files for submission,
make sure that you include all necessary simulation files.
This is very important.
Do not assume the grader has a library or doesn't have a library.
Include everything that is necessary to run your simulation.
It is also your responsibility to make sure that simulation converges and
completes without errors.
Do not include any raw files.
And do not include your results in the submission because the raw
files are very large in size and they really are not going to matter at all.
The grader will have to reproduce your simulation anyway and so
the raw files are not going to be necessary.
You will collect all the files you need into a very clean folder,
zip the folder and upload the zipped file.
And that's going to be the submission of the simulation of work.
Upon submission of your work,
you'll be required to grade submissions by three other students.
Many students choose to grade more and
you will be offered opportunities to grade more than three if you wish to do so.