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ECEN 4797/5797
Introduction to Power Electronics
Prof. Regan Zane
Department of Electrical, Computer, and Energy Engineering
University of Colorado, Boulder
Lecture Outline
• Course details
• What is Power Electronics?
• Application examples
• Who should take this course?
• Course syllabus
• How to succeed in this course!
Introduction to Power ElectronicsECEN 4797/5797
• Instructor: Prof. Regan Zane– Office: ECOT 352; Telephone: (303) 735-1560
– [email protected], http://ecee.colorado.edu/~zane
– Office hours: W 3:00 - 4:00 pm, Th 2:00 - 3:30 pm
– Telephone office hours: M 4:00 - 5:00 pm
• Course sections:– ECEN 4797: Undergraduate
– ECEN 5797 On-campus and off-campus (CAETE)
• Course web site:– http://ecee.colorado.edu/~ecen5797
• Textbook:– Erickson and Maksimovic, Fundamentals of Power
Electronics, second edition, Kluwer Academic Publishers, ISBN 0-7923-7270-0.
Grading
• Homework– Weekly assignments, due at beginning of class on due date (listed on
website)
– Late homework not accepted
– Homework counts 35% of grade
– You may speak with others about the homework, but turn in your own work
– Password-protected solutions on web site
– Homework and exam problems of additional depth and complexity for those earning graduate credit; separately graded
• Exams– Midterm exam: one-week take-home exam, 25% of grade
– Final exam: five-day take-home exam, 40% of grade
• Off-campus students– Fax, Mail or e-mail (PDF) completed homework to Prof. Zane
– See contact information on course website: “Vitals and info”
Personal Info: Prof. Regan Zane
• Background:– Ph.D. in EE from CU-Boulder, 1999
• ASIC controllers for power-factor-corrected AC-DC converters– Research Scientist, GE Global Research, Niskayuna, NY, 1999 to 2001– Assistant professor, CU-Boulder, 2001 – 2007– Associate professor, CU-Boulder, 2007 – present
• Research Interests (applications):– Digital control, ASIC design, and robust, self-calibrating/healing, adaptive
control techniques in power converters– Energy efficient lighting systems (e.g., discharge lamps, LEDs, sensors &
controllers)– Low power energy harvesting; Renewable energy systems– Digital class-D audio amplifiers
• Personal Interests:– Family: wife and three children (10, 8 & 4)– Music: drums and piano– Flying: competition aerobatics, flight instructor– Outdoors: skiing, hiking, biking, camping, etc.
ECEN 4797/5797 is the Prerequisite for the Power Electronics and PV Systems Lab
ECEN2060Renewable Sources
and Efficient Electrical Energy
Systems
ECEN3170Energy
Conversion
ECEN4797/5797Intro to Power
Electronics
ECEN4517/5517Power Electronics and
PV Systems Lab
ECEN4167Energy Conversion 2
ECEN5807Model. and Control of
Power Electronics
ECEN5817Resonant and Soft
Switch Tech. in Power Electronics
ECEN5017Conventional
and Renewable Energy Issues
Sophomore Junior Senior Graduate
Electrical Energy Engineering program at CU Boulder
The course begins with basic experiments on:
• Photovoltaic power systems
• Power conversion electronics
The course then culminates in a design project involving photovoltaics and power electronics
A basic standalone PV power system in the ECEN 4517 laboratoryPV panels, battery, and inverter in the ECEN 4517 laboratory
PVPanel
85 W
Battery
Deep-dischargelead-acid
12 V, 56 A-hr
Inverter
120 V 60 Hz300 W
true sinewave
Charge control
DC-DC converterfor maximum powerpoint tracking and
battery charge profile
ACloads
DC loads
Digital control
ECEN4517/5517Power Electronics and PV Systems Lab
http://ece.colorado.edu/~ecen4517
Portable PV cart: 85 W PV panel, deep discharge lead-acid battery and 300 W inverter to power test equipment
Coursework in Power Electronicsat the University of Colorado
• Power electronics courses– ECEN 4797/5797 (this course): Intro to power electronics (Fall)
– ECEN 5807 Modeling and Control of Power Electronics Systems (Alt Spring semesters, including S ‘09)
– ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics (Alt Spring semesters, including S ‘08)
– ECEN 4517/5517 Power Electronics Laboratory (Spring)
• Professional Certificate in Power Electronics– ECEN 5797, 5807, and 5817
• Formats for this course– On-campus, for senior or graduate credit
– Off-campus, web-based lectures
Why Power Electronics?Where the Jobs AreDemand is rising in analog circuit design, power management, andautomated design, by Scott Kariya
Among the areas where engineers are in short supply: analog and mixed-signal circuit design, power management, and automated design tools.
"Yesterday's" technology still hotOne of the most sustained demands for EEs is in analog and mixed-signal design. Analog? Isn't that obsolete? The fact is, the more computerized the world becomes, the greater the need for interfaces between the analog and digital:
Though demand for analog types has steadily risen, supply has not. Often cast as yesterday's technology, analog circuit design has failed to attract EE students and younger engineers. It's also demanding. … "What differentiates a top engineer from an average engineer is the ability to design all the unique analog building blocks of, say, a power chip from scratch. Such analog building blocks might include a band-gap reference circuit, a gate driver, or a comparator. A really top engineer doesn't rely on a circuit simulator to tell him how a circuit functions."
Bart Kramer, a recruiter for Silicon Laboratories (Austin, Texas), which develops analog and mixed-signal chips, agrees. The key to his company's success, he says, lies in "design engineers who are well grounded in fundamentals—they design elegant solutions."
Power management demandThe near ubiquity of battery-operated mobile electronics—cellphones, PDAs, laptops, MP3 players—is proving a boon for power management engineers … "Power management is the hottest area in the industry right now," Rosetti says
IEEE Spectrum, Jan. 2003
Point-of-Load DC-DCPoint-of-Load
DC-DCPoint-of-Load DC-DC
Power Electronics in Computing
Point-of-Load DC-DC
AC-DC PFC rectifier Off-line
DC-DC
Electronic ballast
μP
VDC,high
VDC,medium
VDC,low
AC line
CCFL inverterfor LCD
backlightingMulti-phase
microprocessor supply (VRM)
DC-DCwith transformer
isolation
Point-of-Load DC-DC
High-frequency DC-DC
Power factor correction rectifier
Battery
Renewable energyPortable electronicsDesktop computersEmbedded systems
Consumer electronicsTelecom
Medical electronicsAutomotive electronics
etc.
PDAs
ProcessingCore
BatteryBatteryMonitorBatteryMonitor
Li-IonProtectorLi-Ion
ProtectorBattery
Management
AudioCodec
AudioCodec
Audio PwrAmp
Audio PwrAmp
Color or B/W LCDwith Touchscreen
TouchscreenControl
TouchscreenControl
FrontlightWhite LED
Supply VoltageSupervisor
Supply VoltageSupervisor
Alkaline
BatteryChargerBatteryCharger
Power Management
BoostConverter
BoostConverter
BuckConverter
BuckConverter
ChargePump
ChargePump
Low-DropoutRegulator
Low-DropoutRegulator
Buck-BoostConverter
Buck-BoostConverter
MicrophoneAmp
MicrophoneAmp
SDRAMSRAMFLASHROM
LogicBus Drvr
Li+ Ni+
BacklightCCFL
CCFL CtrlCCFL Ctrl
Wall SupplyUSB Power
MemoryExpansion
PowerSwitchPowerSwitch
3.3V / 5VSystem Supply
1.5 / 1.8V / 2.5VCore Supply
Wireless I/F
Wired I/F
Microphone
LoudspeakerHeadphonesWireless
Ethernet802.11b
WirelessAccess
Bluetooth
USB
Power Electronics in a PDA
SAa
SBa
SCa
SAa
SBa
SCa
SAa
SBa
SCa
AC powerto utility60 HzPermanent-magnet
synchronousgenerator
Wind turbine
Gate drivers
Digitalinterface(CPLD)
Converterspace-vector
control algorithm(Section 3.4)
Currentsense
+–
Currentsense
d–qtransform
d–qtransform
+– P/Icontrol
P/Icontrol
Referencegenerator current(mag and phase)
+–
P/Icontrol
Capacitorvoltage
sense
ReferenceVcap
Microcontroller PPC555
Power Electronics in Wind Power
Syllabus
Steady State Converter Analysis: Ch2-6, ~6 weeksPrinciples of steady state converter analysisSteady-state equivalent circuit modeling & lossesSwitch realizationDiscontinuous conduction mode operation
Dynamic Modeling & Control: Ch7-9, ~5 weeksAC equivalent circuit modelingConverter transfer functionsController Design
Magnetics Design: Ch13-15, ~4 weeksBasic magnetics theoryInductor & transformer design
How to Succeed in this Course
• Attend live lectures whenever possible– Review and print-out textbook slides before lecture
– Follow along and ASK QUESTIONS IN LECTURE
• Keep up on the homework– Start early, schedule time every week
– Collaborate with classmates AFTER working through the problems once yourself; turn in your own work
• Prepare for the exams– Prepare as if they were in-class, closed-book exams
– Review lectures & assignments, prepare “cheat sheets” with key concepts, procedures and equations
• Off campus: Stay on schedule!!