EE152 HW2 Solutions
Bryant Tan
October 10, 2013
a) Vemf = KM sin . Each phase should contribute on average 0.5 Nm. Suppose the phases
are driven sinusoidally: V0 = c1 sin , V2 = V0 . Consider the torque from phase 0:
0 = KM (c1 KM ) sin2
R
(The additiona
EE152 Green Electronics
Soft Switching (concluded)
Power Factor and Inverters
10/29/13
Prof. William Dally
Computer Systems Laboratory
Stanford University
Course Logistics
Lab 5 PV lab this week
Solar day is on Thursday 10/31/13 (Halloween)
Make sure y
EE152 Green Electronics
Batteries
11/5/13
Prof. William Dally
Computer Systems Laboratory
Stanford University
Course Logistics
Tutorial on Lab 6 during Thursday lecture
Homework 5 due today
Homework 6 out today
Quiz 2 next Thursday 11/14
AC Input/Output S
EE152 Green Electronics
Transformers
Transformer Converters
10/22/13
Prof. William Dally
Computer Systems Laboratory
Stanford University
Course Logistics
Lab 4 signed off this week
Lab 5 out this week
Homework 4 out this week
Quizzes back today
Agenda
Rev
EE152 Green Electronics
Bridge Converters &
Soft Switching
10/24/13
Prof. William Dally
Computer Systems Laboratory
Stanford University
Course Logistics
Lab 4 signed off this week
Lab 5 out this week
Homework 4
Solar day next Thursday
Summary of Transform
EE155/255 F15 Homework 6
Magnetics
Assigned 10/31/16
Due 11/7/16
For both problems, assume a material with a core loss given by
Pc = afcBd
Where loss is 80kW/m3 at B=0.1T, f=100kHz, the exponent of frequency is c=1.6 and
the exponent for B is
EE 155/255: Homework 4 solutions
1. Feedback Control
(a) Equations of Motion
We can redraw our circuit like this:
By superposition, we have these two circuits:
Notice that duty factor DD and Iin are unrelated. In fact, Iin s only purpose is
to set the ini
EE155/255 F16 Homework 1
Periodic SteadyState Analysis
Assigned 9/28/16
Due 10/3/16
Consider the boost converter shown below with L = 100H, C = 100F, VS = 10V, and
ILoad = 1A. Suppose the converter is operating in periodic steady state with a
swi
EE155/255 F16 Homework 2
Power Electronics
Assigned 10/3/16
Due 10/10/16
Problem 1
D1
i
i
V1
G1
D1
+
M1
M1
(b)
Consider the boost converter shown above. FET M1 is an Infineon IPL65R070CP
with Ron = 70mW and CDS= 100pF. The FETs current during tu
Homework 3 solutions
EE155/255 Green Electronics, Fall 2016
Problem 1
This problem was intended to help gain familiarity with LTspice as a circuit simulation tool, and to give
intuition about the operation of a solar panel while maximum power point tracki
EE155/255 F16 Homework 3
SPICE Simulation
Assigned 10/10/16
Due 10/17/16
Preparation
In this problem set you will simulate the power path of our photovoltaic MPPT lab
using SPICE. To get started, download and install LTSPICE to your computer. You
Homework 6 Solutions
EE155/255 Green Electronics
November 8, 2016
Overview: the solutions consist of two parts, the narrative solution listed here and the
accompanying spreadsheets which include the actual calculatio
EE155/255 F15 Homework 4
Feedback Control and Electric Motor
Calculations
Assigned 10/17/16
Due 10/24/16
Problem 1: Feedback Control
Consider the schematic above of a boost converter that converts the energy from an
input current source to an output volta
EE 155/255: Homework 1 solutions
1. (a) The current in the inductor ramps up in position b and ramps down in position
a. The key is to find how much the inductor ramps up or down (I) and what
the average inductor current is in order to find IL Max and IL
EE 155/255: Homework 2 solutions
1. (a) The energy dissipated in the FET during the turn on event can be calculated
by considering the drain current and voltage of the FET during the switching
event. The power dissipated in the FET is the product of the t
EE155/255 F16 Homework 5
Bridge Converter
Assigned 10/24/16
Due 10/31/16
Problem 1
Consider the bridge converter shown in Figure 9.4 of the class notes configured to
directly convert a central office battery voltage (48VDC) to an intermediate volt
EE152 Green Electronics
Quiz 2 Review
11/12/13
Prof. William Dally
Computer Systems Laboratory
Stanford University
Course Logistics
Entering the project phase of the course
Project proposal due today
Homework 6 due today
Lab 6 signed off this week
Quiz 2
Features
Highperformance, lowpower 8bit Atmel AVR Microcontroller
Advanced RISC architecture
131 powerful Instructions most singleclock cycle execution
32 8 general purpose working registers
Fully static operation
Up to 20MIPS throughput at 20MH
Contents
1 Introduction: The World Needs Green Electronics
1.1 The Energy Crisis . . . . . . . . . . . . . . . . . . .
1.2 Green Electronics: Part of the Solution . . . . . . .
1.2.1 Example 1: Photovoltaic Generation . . . . .
1.2.2 Example 2: An Electri
EE152 F13 Homework 3
Switches and Feedback Control
Assigned 10/ 8 /13
Due 10/ 15 /13
Problem 1
a
L
+

iL
Vin
+

V out
b
Suppose you have a boost converter as shown above that uses a FET that has an Ron
of 10
EE152 HW3 Solutions
Bryant Tan
October 16, 2013
Problem 1
Let SIds = 109 A/s be the current rise/fall slope.
a)
tvf all = CVmax /I = (1 nF)(100 V)/(20 A) = 5 ns
tirise = 20 ns.
Eon = 1 (tirise + tvf all )IL Vmax = 25 J
2
b)
The current feeding in the swit
EE152 F13 Homework 4
Magnetics
Assigned 10/ 22 /13
Due 10/ 29 /13
Problem 1 Inductor Design
Design an inductor with the following characteristics:
Symbol
Value Description
L
10H Inductance
Imax
10A
Peak Curr
EE152 Lab 1
Revision 3, 30 Sep 2013
1
Lab 1: The Beginning
This lab is an introduction to developing for an AVR microcontroller and the tools we will
use for the rest of this course.
Assigned: September 24, 2013.
Signoffs: Week of September 30, 2013.
1
He
EE152 Lab 3
Revision 2, 17 Oct 2013
1
Motor Control Part I
1
Introduction
This lab has two parts. For the rst week, you will characterize a brushed DC motor, build
a mathematical model of it, and design a speed controller for it. In the second week, you
w
EE152 Lab 4
Revision 1, 21 Oct 2013
1
Motor Control Part II
Signoffs: Week of October 21, 2013.
1
Introduction
In this lab you will implement the speed controller that you designed in the previous lab
with real hardware and demonstrate that the motor can
EE152 Lab 2
Revision 1, 30 Sep 2013
1
Energy Meter
In this lab, youll build and program a meter that measures voltage, current, power, and
energy at DC and AC.
Assigned: October 1, 2013.
Signoffs: Week of October 7, 2013.
1
New Code
Download the code from
1
Brushed Motor Test Rig
EE152 Green Electronics
Revision
Date
By
Notes
1
6.2.2013
Paul Karplus
Initial Release
Summary:
The brushed motor test rig is a simple, robust platform for
testing brushed motor controllers. The rig is designed to help
students te
EE152 HW1 Solutions
Bryant Tan
October 10, 2013
Part 1
The inductor sees on average V1 Da at its input and V2 Db at its output.
Since at steady state the inductor must have no average voltage across it, V1 Da = V2 Db .
V2 =
Da
V1
Db
Part 2
Consider the bl
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Des
ign
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