Homework 1
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http:/127.0.0.1:8888/4b46215f-416a-41cd-8deb-2f267ac33954
Solutions to homework set #1:
This uses python notebook software. It is like Matlab, free, and runs on platforms other than windows. I am using version 2.7. It is a package based
EE 4161 Spring 2013 HW6 Solutions
Q1
For the Buck converter shown below
minVin = 50 VDC
maxVin = 200 VDC
VO = 40 VDC
RL = 5 ohms
Vcr = 0.7 V
Rd,on = 0.1 ohms (FET equivalent resistance when on)
For the range of input voltages given above, plot the followi
Hmwk3
1 of 3
http:/127.0.0.1:8888/4281f8d9-6a92-4f22-93ca-6a1b41.
In [76]: from _future_ import division #python quirk
from IPython.core.display import Image
Prob 4:
It is easiest to do this in spice. There will be a voltage across and current through the
http:/www.currentresults.com/Weather/Minnesota/average-sunshinejanuary.php
From the data through the website that I gave, we can get this:
Month
Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sep
Oct
Nov
Dec
Total days
with sun
15
15
14
15
16
17
22
21
18
17
11
12
From
EE4161
Homework Assignment
Due Jan 31
Problems:
1. Read Mertens Ch. 3 and in Ch. 4, 4.1 and 4.2
2. The goal of this problem is to calculate the current from a photovoltaic cell as exactly as
possible for a very simple case. It follows the method you used
EE4161W
Homework Assignment
Due Jan 24
1. Read Ch. 1 and 2 in Mertens and Roth
2. Exercise 1.5c in Mertens and Roth (State your assumptions).
3. Download the solar spectrum for AM1.5 (google AM1.5 and xls). Plot the number of photons
per unit wavelength p
EE4161
Due Dates
Memo on Topic due Thurs, Jan 26
Citations and corresponding technical facts due Feb 6
Abstract due Feb 9
Peer revision due Feb 14
Revised abstract due to be determined
Extended introduction due Mar 10
Focused topic paper due April 29
In c
Citation Rubric
The purpose of this assignment is for you to begin investigating sources that will be useful in
writing your final paper. The requirement for this assignment is to cite 3 different sources in
IEEE format and provide a technical quote from
EE4161W
An incomplete list of possible topics
revised Jan 18
Possible topics:
Note that the final paper will only be about 5 pages. This means that for your paper to any meaningful technical content, the topic needs to be very focused. A paper reviewing a
Abstract Guidelines and Rubric
As discussed in class, the purpose of an abstract is to provide indexing
services with keyword and to inform the reader what they will be reading in the
rest of the paper. In this early stage of the paper writing process, wr
EE4161Exam 2 Spring 2013
Solutions
1. 3 mistakes in boost converter
Diode needs to be flipped back-to-front so current can actually flow
Capacitor at Output has the wrong polarity, flip this also.
Transistor control switch doesnt function as drawn. The NP
A Summary of Useful Equations
q
o
Ks
ns
ns
Ko
kB
kB
h
mo
kB T /q
c
NA
R
1.6 1019 C
electron charge
14
8.85 10
F/cm
permittivity of free space
11.8 (Si)
relative dielectric constant
3.4 (Si)
refractive index
1.0 (air)
refractive index
3.9 (SiO2 )
relative
Name:
I.D.:
Grade:
1.
2.
3.
4.
5.
Instructions
1. Please write neatly so that we can easily find ways to give partial credit.
2. Place a box around your final answer
3. Calculators are allowed but must not be shared.
4. Wireless connections and other elec
Name:
I.D.:
Grade:
1.
2.
3.
4.
5.
Instructions
1. Please write neatly so that we can easily find partial credit
2. Place a box around your final answer
3. Calculators are allowed but must not be shared.
4. Wireless connections and other electronics are no
Homework problems
Q1
In the power converter diagrammed below, plot ia from zero to 80 sec for three cases.
a) Pout = 50 W, steady state
b) Pout = 12.8 W, steady state
c) Pout = 8 W, steady state
How would this change if the switch was comprised of an uppe
EE4161
Homework Assignment
Due Thurs, April 11
1. 1 mol of H2 SO4 completely dissociates into H+ and HSO4 in 1 liter of water. What is the
hydrogen ion concentration per cc?
2. For the nanowire battery electrode shown, estimate the effective surface area
EE4161
Homework Assignment
Due Feb 26
I (mA)
1. Three solar cells are connected in series with individual shunt diodes. The short circuit currents are 20, 10, and 2 mA. On the plot below, the IV characteristic of each diode and shunt
is shown separately.
Homework Due May 7
1 of 4
http:/127.0.0.1:8888/90737391-b9b9-4d4e-8398-834b0c5bbedd
Set due May 1, 2012:
The following uses python, which is very close in syntax to Matlab but is free, provides easier use of functions, and has a
"notebook" mode that works
EE4161
White Paper Guidelines
Due Feb 18
The main writing assignment for EE4161W is to be a proposal to a company to invest in a
new technology related to energy that (1) has a strong relation to electrical engineering, (2) you
are able to describe in tec
Admin
Overview
Course Focus
1. Photovoltaic devices are being developed as an
important energy source. Though under development
for over 35 years, they still need improvement to be
economical. They are close. We will discuss the
physics of their operation
EE4161
Homework Assignment
Due April 30
A battery is discharged from 100% SOC at a rate of C/2 for 30 minutes. How long will it
take to fully recharge the battery at a rate of C/10? Assume that the battery follows the Peukert
equation with k=1.3, i.e.
ik
Homework_April_30
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In [17]: from _future_ import division
Prob 1
At each SOC the battery is charged and discharged for equal times. The energy required to charge is
trip efficiency is
=
Q V =
EE4161
Homework Assignment
Due April 30
100%
40%
I (A)
1. A 30 Ah battery has the following IV profile. Assume it is at a particular SOC (state of
charge) and is charged for a very short time at 0.1C. It is then discharged at 0.1C for the
same amount of t
EE4161
Homework Assignment
Due Jan 31
1. Download the solar spectrum for AM1.5 (google AM1.5 and xls). Plot the number of photons
per unit wavelength per second striking the earth per square meter vs wavelength. Use the
direct + circumsolar data.
2. From
EE4161
Homework Assignment
Due Thurs, Apr 4
.
Homework
problems
Q1
In the power converter diagrammed below, plot ia from zero to 80 sec for three cases.
a) Pout = 50 W, steady state
b) Pout = 12.8 W, steady state
c) Pout = 8 W, steady state
How w
EE4161
Homework Assignment
Due Mar12
Q1 .
For the Buck converter shown below
minVin = 50 VDC
maxVin = 200 VDC
VO = 40 VDC
RL = 5 ohms
Vcr = 0.7 V
Rd,on = 0.1 ohms (FET equivalent resistance when on)
For the range of input voltages given above, plot the fo