NOTES 01 INTRODUCTION TO POWER ELECTRONICS… 01 INTROD… · Power Electronics Notes 01Power...
Transcript of NOTES 01 INTRODUCTION TO POWER ELECTRONICS… 01 INTROD… · Power Electronics Notes 01Power...
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Power Electronics Notes 01Power Electronics Notes 01Introduction to Power Electronics
Marc T. Thompson, Ph.D.Thompson Consulting, Inc.
9 Jacob Gates RoadHarvard, MA 01451
Phone: (978) 456-7722 Fax: (240) 414-2655
Email: marctt@thompsonrd comEmail: [email protected]: http://www.thompsonrd.com
Introduction to Power Electronics© M. T. Thompson, 2009 1
© Marc Thompson, 2005-2007
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Introduction to Power ElectronicsIntroduction to Power Electronics• Power electronics relates to the control and flow of
electrical energyelectrical energy• Control is done using electronic switches, capacitors,
magnetics, and control systemsS f l t i illiW tt i W tt• Scope of power electronics: milliWatts ⇒ gigaWatts
• Power electronics is a growing field due to the improvement in switching technologies and the need for more and more efficient switching circuits
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SummarySummary• History/scope of power electronics• Some interesting PE-related projectsSome interesting PE related projects• Circuit concepts important to power electronics• Some tools for approximate analysis of power
l t i telectronics systems• DC/DC converters --- first-cut analysis• Key design challenges in DC/DC converter design• Basic system concepts
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Scope of Power ElectronicsScope of Power ElectronicsPower Level (Watts) System 0.1-10 • Battery-operated equipment
• Flashes/strobes• Flashes/strobes 10-100 • Satellite power systems
• Typical offline flyback supply 100 – 1kW • Computer power supply
• Blender 1 – 10 kW • Hot tub 10 – 100 kW • Electric car
• Eddy current braking• Eddy current braking100 kW –1 MW • Bus
• micro-SMES 1 MW – 10 MW • SMES10 MW – 100 MW • Magnetic aircraft launch
• Big locomotives 100 MW – 1 GW • Power plant > 1 GW S d P d b t ti (2 2 GW)
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> 1 GW • Sandy Pond substation (2.2 GW)
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Scope of Power ElectronicsScope of Power Electronics
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Areas of Application of Power ElectronicsAreas of Application of Power Electronics• High frequency power
conversion• Power Transmission
– HVDC– DC/DC, inverters
• Low frequency power conversion
– HVAC• Power quality
– Power factorconversion– Line rectifiers
• Distributed power
– Power factor correction
– Harmonic reductionP i filt i
psystems
• Power devices• Passive filtering• Active filtering
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Some ApplicationsSome Applications• Heating and lighting control• Induction heating
• Uninterruptible power supplies (UPS)
• Fluorescent lamp ballasts– Passive– Active
• Electric power transmission• Automotive electronics
– Electronic ignitions
• Motor drives• Battery chargers• Electric vehicles
– Alternators• Energy storage
– Flywheels• Electric vehicles– Motors– Regenerative braking
Switching power supplies
y– Capacitors– SMES
• Power conditioning for• Switching power supplies• Spacecraft power systems
– Battery powered
Power conditioning for alternative power sources– Solar cells– Fuel cells
Introduction to Power Electronics© M. T. Thompson, 2009 7
– Flywheel poweredFuel cells
– Wind turbines
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Some Power Electronics-Related Projects Worked on at TCI (Harvard Labs)
• High speed lens actuator• Laser diode pulsers• Levitated flywheel• MaglevMaglev• Permanent magnet brakes• Switching power supplies• Magnetic analysis• Magnetic analysis• Laser driver pulsers• 50 kW inverter switch• Transcutaneous (through-skin) non-contact power supply
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Lens ActuatorLens Actuatorz
Ironr
Back iron
CoilIron
Lens
PermanentNd-Fe-BoMagnetLens g
Air gap
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High Power Laser Diode Driver Based on Power Converter Technology
Overdrive
Laser DiodeOVERDRIVESwitching
Array
ArrayDriver
Iod
Overdriveduration set
THRESH. currentsetO.D. current
set
TTLINPUT
ArrayDriver
PEAKSwitching
Array
Drive
Drive*
Is
-12
Ith
set-12V
Rsense
PowerConverter
Vsense
-12
Diff. Amp.
PEAK currentset
LoopP W M
D
Vc LoopFilter
P.W.M.
See:1. B. Santarelli and M. Thompson, U.S. Patent #5,123,023, "Laser Driver with Plural Feedback Loops," issued June 16, 19922. M. Thompson, U.S. Patent #5,444,728, "Laser Driver Circuit," issued August 22, 19953. W. T. Plummer, M. Thompson, D. S. Goodman and P. P. Clark, U.S. Patent #6,061,372, “Two-Level Semiconductor Laser
Introduction to Power Electronics© M. T. Thompson, 2009 10
Driver,” issued May 9, 2000 4. Marc T. Thompson and Martin F. Schlecht, “Laser Diode Driver Based on Power Converter Technology,” IEEE
Transactions on Power Electronics, vol. 12, no. 1, Jan. 1997, pp. 46-52
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Magnetically-Levitated Flywheel Energy StorageMagnetically Levitated Flywheel Energy Storage• For NASA; P = 100W, energy storage = 100 W-hrs
Guidance and Suspension
Flywheel (Rotating)SN
NS
NS
SN
NS
Flywheel (Rotating)
Stator Winding
NS
SN
SN
S
SN
NS
N
NS
SN N
SSN
z
r
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r
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Electromagnetic Suspension --- MaglevElectromagnetic Suspension --- Maglev
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Maglev - German TransrapidMaglev - German Transrapid
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Maglev - Japanese EDS
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Japanese EDS GuidewayJapanese EDS Guideway
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MIT Maglev Suspension MagnetMIT Maglev Suspension Magnet
Reference: M. T. Thompson, R. D. Thornton and A. Kondoleon, “Flux-canceling electrodynamic maglev suspension: Part I Test fixture design and modeling ” IEEE Transactions on Magnetics vol 35 no 3 May 1999
Introduction to Power Electronics© M. T. Thompson, 2009 16
suspension: Part I. Test fixture design and modeling, IEEE Transactions on Magnetics, vol. 35, no. 3, May 1999 pp. 1956-1963
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MIT Maglev Test FixtureMIT Maglev Test Fixture
M. T. Thompson, R. D. Thornton and A. Kondoleon, “Flux canceling electrodynamic maglev suspension:Flux-canceling electrodynamic maglev suspension: Part I. Test fixture design and modeling,” IEEE Transactions on Magnetics, vol. 35, no. 3, May 1999 pp. 1956-1963
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MIT Maglev Test FixtureMIT Maglev Test Fixture• 2 meter diameter
test wheeltest wheel• Max. speed 1000
RPM (84 m/s)F t ti “fl• For testing “flux canceling” HTSC Maglev
• Sidewall levitation
“ f
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M. T. Thompson, R. D. Thornton and A. Kondoleon, “Flux-canceling electrodynamic maglev suspension: Part I. Test fixture design and modeling,” IEEE Transactions on Magnetics, vol. 35, no. 3, May 1999 pp. 1956-1963
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Permanent Magnet BrakesPermanent Magnet Brakes• For roller coasters• Braking force > 10 000Braking force > 10,000
Newtons per meter of brake
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Reference: http://www.magnetarcorp.com
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Halbach Permanent Magnet ArrayHalbach Permanent Magnet Array • Special PM arrangement allows strong side (bottom)
and weak side (top) fieldsand weak side (top) fields• Applicable to magnetic suspensions (Maglev), linear
motors, and induction brakes
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Halbach Permanent Magnet ArrayHalbach Permanent Magnet Array
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Linear Motor Design and AnalysisLinear Motor Design and Analysis
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Variac Failure AnalysisVariac Failure Analysis
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PhotovoltaicsPhotovoltaics
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Reference: S. Druyea, S. Islam and W. Lawrance, “A battery management system for stand-alone photovoltaic energy systems,” IEEE Industry Applications Magazine, vol. 7, no. 3, May-June 2001, pp. 67-72
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Offline Flyback Power SupplyOffline Flyback Power Supply
Reference: P Maige “A universal power supply integrated circuit for TV and monitor applications ” IEEE Transactions
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Reference: P. Maige, A universal power supply integrated circuit for TV and monitor applications, IEEE Transactions on Consumer Electronics, vol. 36, no. 1, Feb. 1990, pp. 10-17
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Transcutaneous Energy Transmissiongy
Reference: H Matsuki Y Yamakata N Chubachi S -I Nitta and H Hashimoto “Transcutaneous DC-DC
Introduction to Power Electronics© M. T. Thompson, 2009 26
Reference: H. Matsuki, Y. Yamakata, N. Chubachi, S.-I. Nitta and H. Hashimoto, Transcutaneous DC-DC converter for totally implantable artificial heart using synchronous rectifier,” IEEE Transactions on Magnetics, vol. 32 , no. 5, Sept. 1996, pp. 5118 - 5120
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50 kW Inverter Switch
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Non-Contact Battery ChargerNon-Contact Battery Charger
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High Voltage RF Supply
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60 Hz Transformer Shielding Study60 Hz Transformer Shielding Study
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“Intuitive Analog Circuit Design”
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“Power Quality in Electrical Systems”
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Some Other Interesting Power Electronics Related Systems
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Conventional vs Electric CarConventional vs. Electric Car
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High Voltage DC (HVDC) TransmissionHigh Voltage DC (HVDC) Transmission
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Mass Spectrometer
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Reference: http://www.cameca.fr/doc_en_pdf/oral_sims14_schuhmacher_ims1270improvements.pdf
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Some Disciplines Encompassed in the Field of Power Electronics
• Analog circuitsHigh speed (MOSFET
• Machines/motorsSimulation– High speed (MOSFET
switching, etc.)– High power
PC b d l t
• Simulation – SPICE, Matlab, etc.
• Device physicsH t k b tt– PC board layout
– Filters• EMI
C l h
– How to make a better MOSFET, IGBT, etc.
• Thermal/coolingH d i h• Control theory
• Magnetics– Inductor design
– How to design a heat sink
– Thermal interfaces– Transformer design
• Power systems– Transmission lines
– Thermal modeling
Introduction to Power Electronics© M. T. Thompson, 2009 37
– Line filtering
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Selected History of Power Switching DevicesSelected History of Power Switching Devices
• 1831 --- Transformer action demonstrated by Michael Faradaydemonstrated by Michael Faraday
• 1880s: modern transformer invented
f C “ f ( ”
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Reference: J. W. Coltman, “The Transformer (historical overview,” IEEE Industry Applications Magazine, vol. 8, no. 1, Jan.-Feb. 2002, pp. 8-15
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Selected History of Power Switching Devices• Early 1900s: vacuum tube
– Lee DeForest --- triode, 19061920 1940 t b t
y g
• 1920-1940: mercury arc tubes to convert 50Hz, 2000V to 3000VDC for railway
Reference: M. C. Duffy, “The mercury-arc rectifier and supply
Introduction to Power Electronics© M. T. Thompson, 2009 39
to electric railways,” IEEE Engineering Science and Education Journal, vol. 4, no. 4, August 1995, pp. 183-192
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Selected History of Power Switching DevicesSelected History of Power Switching Devices
• 1930s: selenium rectifiers• 1948 Silicon Transistor• 1948 - Silicon Transistor
(BJT) introduced (Bell Labs)• 1950s - semiconductor power
diodes begin replacing vacuum tubes
• 1956 - GE introduces Silicon-Controlled Rectifier (SCR)
f “ S S C f ( ) ”
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Reference: N. Holonyak, Jr., “The Silicon p-n-p-n Switch and Controlled Rectifier (Thyristor),” IEEE Transactions on Power Electronics, vol. 16, no. 1, January 2001, pp. 8-16
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Selected History of Power Switching Devices• 1960s - switching speed of BJTs allow DC/DC converters
possible in 10-20 kHz range• 1960 - Metal Oxide Semiconductor Field-Effect Transistor1960 Metal Oxide Semiconductor Field Effect Transistor
(MOSFET) for integrated circuits• 1976 - power MOSFET becomes commercially available,
allows > 100 kHz operationallows > 100 kHz operation
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Reference: B. J. Baliga, “Trends in Power Semiconductor Devices,” IEEE Transactions on Electron Devices, vol. 43, no. 10, October 1996, pp. 1717-1731
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Selected History of Power Switching Devices• 1982 - Insulated Gate Bipolar Transistor (IGBT) introduced
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Reference: B. J. Baliga, “Trends in Power Semiconductor Devices,” IEEE Transactions on Electron Devices, vol. 43, no. 10, October 1996, pp. 1717-1731
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Review of Basic Circuit Concepts• Some background in circuits• Some background in circuits
• Laplace notation• First-order and second-order systems• Resonant circuits, damping ratio, Qp g , Q
• Reference for this material: M. T. Thompson, Intuitive Analog Circuit Design Elsevier 2006Circuit Design, Elsevier, 2006 (course book for ECE529) and Power Quality in Electrical Systems, McGraw-Hill, 2007 by A. Kusko and M. Thompson
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Laplace Notationp• Basic idea: Laplace transform converts differential
equation to algebraic equationG ll th d i d i i id l t d t t• Generally, method is used in sinusoidal steady state after all startup transients have died out
Circuit domain Laplace (s) domain Resistance, R R Inductance L Ls C i C 1Capacitance C
Cs1
+R1 R1
-vo
+vi - R2
C
+
-vo(s)+vi(s) -
1/(Cs)R2
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System Function• Find “transfer function” H(s) by solving Laplace transformed
circuit
+R1
R1
-vo
+vi - R2
C+
-vo(s)+vi(s) -
1
1/(Cs)R2
1)(1
1
1
)()()(
21
2
21
2
+++
=++
+==
CsRRCsR
CsRR
CsR
svsvsH
i
o
Introduction to Power Electronics© M. T. Thompson, 2009 45
Cs
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First-Order Systems
eVtvt
o −=−τ )1()(
eRVti
t
r =−τ)(
RC=τ
ττ 22=
Time constant
Risetimeττ 2.2=R
ω 1h =
350
Risetime
πωτ
2h
h
h
f = hR f
35.0=τBandwidth
Introduction to Power Electronics© M. T. Thompson, 2009 46
π2
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First-Order Step and Frequency Responsep q y pde
Step Response
0.8
1
Am
plitu
d
0 1 2 3 4 5 60
0.2
0.4
0.6
Time (sec.)0 1 2 3 4 5 6
e (d
B)
Bode Diagrams
0
hase
(deg
); M
agni
tude
-20
-10
-60-40-20
Frequency (rad/sec)
Ph
10-1
100
101
-80
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Review of Second-Order SystemsReview of Second-Order Systems
++
R L
-vo
+vi - C
1
22
2
2
22 2121
11
1)()()(
nn
n
i
o
ssssRCsLCsCs
LsR
CssvsvsH
ωζωω
ωζ
ω++
=++
=++
=++
==
n LC1
=ω
nnCs ωω
Natural frequency
o
n
ZR
LRRC
LC
21
21
2===
ως
q y
Damping ratio
Introduction to Power Electronics© M. T. Thompson, 2009 48
C
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Second-Order System Frequency Response
⎟⎟⎞
⎜⎜⎛
−+=
2
2
121)(
ωςωω
jjH
⎞⎛⎞⎛=
⎟⎠
⎜⎝
222
2
1)( ω
ωω nn
jH
⎞⎛
⎟⎟⎠
⎞⎜⎜⎝
⎛−+⎟⎟
⎠
⎞⎜⎜⎝
⎛2
2
22
2
12ωω
ωςω
nn
⎟⎟⎠
⎞⎜⎜⎝
⎛−
−=⎟⎞
⎜⎛
⎟⎟⎠
⎞⎜⎜⎝
⎛
−=∠ −−22
12
1 2tan
2
tan)(ωω
ςωωω
ωςω
ω nnjH⎠⎝
⎟⎟⎠
⎞⎜⎜⎝
⎛− 21
ωωωω n
n
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Second-Order System Frequency ResponseSecond Order System Frequency Response• Plots show varying damping ratio
Frequency response for natural frequency = 1 and various damping ratios
10
20
30
Mag
nitu
de (d
B)
-40
-30
-20
-10
0
10
Pha
se (d
eg);
Ma
-50
0
10-1
100
101
-150
-100
Introduction to Power Electronics© M. T. Thompson, 2009 50
Frequency (rad/sec)
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Second-Order System Frequency Response at Natural Frequency
• Now, what happens if we excite this system exactly at the t l f ? Th inatural frequency, or ω = ωn? The response is:
121)(ςωω
== n
sH
2)( π
ωω −=∠ = nsH
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Relationship Between Damping Ratio and “Quality Factor” Q
• A second order system can also be characterized by its “Q lit F t ” “Q”“Quality Factor” or “Q”
1 QsHn
=== ςωω 2
1)(
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Second-Order System Step Response• Shown for varying values of damping ratio
Step Response
2Step response for natural frequency = 1 and various damping ratios
14
1.6
1.8
2
Am
plitu
de
1
1.2
1.4
0.4
0.6
0.8
Time (sec.)
0 1 2 3 4 5 6 7 8 9 10
0
0.2
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Second-Order Mechanical System• Electromechanical modeling
Introduction to Power Electronics© M. T. Thompson, 2009 54
Reference: Leo Beranek, Acoustics, Acoustical Society of America, 1954
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Pole Location Variation with Damping
Very underdamped
ωj
j
Critically damped Overdamped
ωjωj
σ
x njω+
σxnω−
2 polesσxx
x njω−
2 poles
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Undamped Resonant Circuit
+
iL
-vc C L
Now we can find the resonant frequency by guessing that the voltage v(t) isNow, we can find the resonant frequency by guessing that the voltage v(t) is sinusoidal with v(t) = Vosinωt. Putting this into the equation for capacitor voltage results in:
1 )sin(1)sin(2 tLC
t ωωω −=−
This means that the resonant frequency is the standard (as expected) resonance:This means that the resonant frequency is the standard (as expected) resonance:
LCr12 =ω
Introduction to Power Electronics© M. T. Thompson, 2009 56
LC
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Energy MethodsEnergy Methods
+
iL
-vc C L
By using energy methods we can find the ratio of maximum capacitor voltage to maximum inductor current. Assuming that the
it i i iti ll h d t V lt d b i th tcapacitor is initially charged to Vo volts, and remembering that capacitor stored energy Ec = ½CV2 and inductor stored energy is EL = ½LI2, we can write the following:
22
21
21
oo LICV =
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Energy Methods
+
iL
-vc C L
What does this mean about the magnitude of the inductor current ? Well, we can solve for the ratio of Vo/Io resulting in:
LVo
o
o ZCL
IV
≡=
The term “Zo” is defined as the characteristic impedance of a resonantThe term Zo is defined as the characteristic impedance of a resonant circuit. Let’s assume that we have an inductor-capacitor circuit with C = 1 microFarad and L = 1 microHenry. This means that the resonant frequency is 106 radians/second (or 166.7 kHz) and that the characteristic impedance i 1 Oh
Introduction to Power Electronics© M. T. Thompson, 2009 58
is 1 Ohm.
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Simulation
+v C L
iL
-vc C L
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Typical Resonant Circuit• Model of a MOSFET gate drive circuit• Model of a MOSFET gate drive circuit
111
1)()( 22 ==== o CssvsH
1211)()(
2
22
++++++nn
i ssRCsLCsCs
LsRsvsH
ωζ
ω1
=ω
o
n
n
ZR
LRRC
LC
21
21
2===
=
ως
ω
Introduction to Power Electronics© M. T. Thompson, 2009 60
o
CL
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Resonant Circuit --- UnderdampedWith “ ll” i t i it i d d d• With “small” resistor, circuit is underdamped
1
8.31
sec/2001==
n
n
MHzf
MradLC
ω
5Ω==o
n
CLZ
f
001.021
21
2====
o
n
ZR
CL
RRCως
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C
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Resonant Circuit --- Underdamped Resultsp• This circuit is very underdamped, so we expect step response to oscillate at around 31.8 MHz
E t k f ith k 31 8 MH
sec/2001== Mradω
• Expect peaky frequency response with peak near 31.8 MHz
8.31
sec/200==
n
n
MHzf
MradLC
ω
11
5Ω==o
RRRCCLZ
ω001.0
21
21
2====
o
n
ZR
CL
RRCως
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C
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Resonant Circuit --- Underdamped Results, Step p , pResponse
• Rings at around 31.8 MHz
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Resonant Circuit --- Underdamped Results, p ,Frequency Response
• Frequency response peaks at 31.8 MHz
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Resonant Circuit --- Critical Dampingp g
• Now, let’s employ “critical damping” by increasing value of resistor to 10 Ohms• This is also a typical MOSFET gate drive damping resistor value
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Critical Damping, Step Responsep g, p p
• Note that response is still relatively fast (< 100 ns response time) but with no overshootp )• If we make R larger, the risetime slows down
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Critical Damping, Frequency Responsep g, q y p
• No overshoot in the transient response corresponds to no peaking in the frequency responsep g q y p
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Circuit ConceptsCircuit Concepts• Power
– Reactive powerReactive power– Power quality– Power factor
R t M S (RMS)• Root Mean Square (RMS)• Harmonics
– Harmonic distortion
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SinewavesSinewaves
• A sinewave can be 200120V RMS 60 Hz sinewave
expressed as v(t) = Vpksin(ωt)• Vpk = peak voltage 50
100
150
Vpk peak voltage• ω = radian frequency (rad/sec)
= 2 f where f is in Hz-50
0
50
• ω = 2πf where f is in Hz• VRMS = Vpk/sqrt(2) = 120V for sinewave with 0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018
-200
-150
-100
Time[sec]
peaks at ±170V• More on RMS later
Time [sec.]
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Sinewave with Resistive Load• v(t) and i(t) are in phase and have the same shape; i.e. no harmonics in current
Time representation Ph t ti- Time representation -Phasor representation-In this case, V and I have the same phasep
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Sinewave with Inductive Load• For an inductor, remember that v = Ldi/dt • So, i(t) lags v(t) by 90o in an inductor
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Sinewave with Inductive Load --- PSIMSinewave with Inductive Load --- PSIM
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Sinewave with L/R Load• Phase shift (also called angle) between v and i is somewhere between 0o and -90o
⎟⎠⎞
⎜⎝⎛−=∠ −
RLω1tan
⎠⎝ R
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Sinewave with Capacitive Load• Remember that i = Cdv/dt for a capacitor • Current leads voltage by +90o
- Phasor representation
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Phasor Representation of L and C
In inductor, current lagsvoltage by 90 degrees
In capacitor, voltage lagscurrent by 90 degrees
Introduction to Power Electronics© M. T. Thompson, 2009 75
g y g current by 90 degrees
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Response of L and C to Pulses
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Review of Complex Numbers• In “rectangular” form, a complex number is written in terms of real and imaginary components• A = Re(A) + j×Im(A)A Re(A) j×Im(A)
- Angle
⎟⎟⎠
⎞⎜⎜⎝
⎛= −
)Re()Im(tan 1
AAθ
( ) ( )22 )()(
- Magnitude of A
( ) ( )22 )Im()Re( AAA +=
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Find Polar Form• Assume that current I = 3 5 + j(4 2)• Assume that current I = -3.5 + j(4.2)
AI 5.5)2.4()5.3( 22 =+−=
o
o
2502.4tan
180
1 =⎟⎞
⎜⎛=
−=
−γ
γθ
ooo 8.1292.50180
2.505.3
tan
=−=
=⎟⎠
⎜⎝
=
θ
γ
Introduction to Power Electronics© M. T. Thompson, 2009 78
oA 8.1295.5 ∠∴
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Converting from Polar to Rectangular Form
{ } )cos(Re θAA{ }{ } )sin(Im
)cos(Re
θ
θ
AA
AA
=
=
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PowerPower• “Power” has many shapes and forms
– Real powerp– Reactive power
• Reactive power does not do real work– Instantaneous power– Instantaneous power
P k i t t
)()()( titvtp =– Peak instantaneous power– Average power
T1 dttitvT
tpT
)()(1)(0∫=
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Power FactorPower Factor• Ratio of delivered power to the product of RMS voltage and
RMS currentP ><
RMSRMS IVPPF ><
=
• Power factor always <= 1• With pure sine wave and resistive load, PF = 1• With pure sine wave and purely reactive load, PF = 0p p y ,• Whenever PF < 1 the circuit carries currents or voltages
that do not perform useful work• The more “spikey” a waveform is the worse is its PF• The more spikey a waveform is the worse is its PF
– Diode rectifiers have poor power factor• Power factor can be helped by “power factor correction”
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Causes of Low Power Factor--- L/R LoadCauses of Low Power Factor--- L/R Load
• Power angle is θ = tan-1(ωL/R)• For L = 1H R = 377 Ohms θ = 45o and PF = cos(45o) =• For L = 1H, R = 377 Ohms, θ = 45o and PF = cos(45o) =
0.707
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Causes of Low Power Factor --- Non-linear Load• Nonlinear loads include:
• Variable-speed drives • Frequency converters• Frequency converters • Uninterruptable power
supplies (UPS) • Saturated magnetic
circuits • Dimmer switches • Televisions • Fluorescent lamps • Welding sets• Welding sets • Arc furnaces • Semiconductors
B tt hIntroduction to Power Electronics© M. T. Thompson, 2009 83
• Battery chargers
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Half Wave Rectifier with RC Load• In applications where cost is a major consideration, a capacitive filter may be used.• If RC >> 1/f then this operates like a peak detector and theIf RC 1/f then this operates like a peak detector and the output voltage <vout> is approximately the peak of the input voltage
Diode is only ON for a short time near the sinewave peaks• Diode is only ON for a short time near the sinewave peaks
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Half Wave Rectifier with RC Load• Note poor power factor due to peaky input line current
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Unity Power Factor --- Resistive LoadUnity Power Factor --- Resistive Load• Example: purely resistive load
– Voltage and currents in phase
sin)(
sin)(
2
=
=
tRVti
tVtv
ω
ω
2)(
sin)()()(
2
22
>=<
==
RVtp
tR
Vtitvtp ω
2
2
=
=
RVI
VV
RMS
RMS
12)(
22
=⎟⎠⎞
⎜⎝⎛
⎟⎠⎞
⎜⎝⎛
=><
=VV
RV
IVtpPF
R
RMSRMS
Introduction to Power Electronics© M. T. Thompson, 2009 86
22⎟⎠
⎜⎝
⎟⎠
⎜⎝ R
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Causes of Low Power Factor --- Reactive Load• Example: purely inductive load
– Voltage and currents 90o out of phasesin)( tVtv ω
cos)(
sin)(
=
=
tL
Vti
tVtv
ωω
ω
0)(
cossin)()()(2
>=<
==
tp
ttL
Vtitvtp ωωω
0)( >< tp
• For purely reactive load PF 0load, PF=0
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Why is Power Factor Important?• Consider peak-detector full-wave rectifier
• Typical power factor kp = 0.6• What is maximum power you can deliver to load ?• What is maximum power you can deliver to load ?
– VAC x current x kp x rectifier efficiency– (120)(15)(0.6)(0.98) = 1058 Watts
• Assume you replace this simple rectifier by power electronics module with 99% power factor and 93% efficiency:
Introduction to Power Electronics© M. T. Thompson, 2009 88
y– (120)(15)(0.99)(0.93) = 1657 Watts
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Power Factor Correction• Typical toaster can draw 1400W from a 120VAC/15A line• Typical offline switching converter can draw <1000W
because it has poor power factorbecause it has poor power factor• High power factor results in:
– Reduced electric utility bills – Increased system capacity – Improved voltage – Reduced heat losses
• Methods of power factor correction– Passive
• Add capacitors across an inductive load to resonate• Add capacitors across an inductive load to resonate• Add inductance in a capacitor circuit
– Active
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Power Factor Correction --- PassivePower Factor Correction Passive• Switch capacitors in and out as needed as load changes
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Power Factor Correction --- ActivePower Factor Correction --- Active• Fluorescent lamp ballast application
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Root Mean Square (RMS)• Used for description of periodic, often multi-harmonic,
waveforms• Square root of the average over a cycle (mean) of theSquare root of the average over a cycle (mean) of the
square of a waveform∫=T
RMS dttiT
I0
2 )(1
0
• RMS current of any waveshape will dissipate the same amount of heat in a resistor as a DC current of the same valuevalue– DC waveform: Vrms = VDC– Symmetrical square wave:
• IRMS = Ipk– Pure sine wave
• IRMS=0.707Ipk
Introduction to Power Electronics© M. T. Thompson, 2009 92
RMS 0 0 pk• Example: 120 VRMS line voltage has peaks of ±169.7 V
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Intuitive Description of RMS• The RMS value of
a sinusoidal or other periodic waveform dissipates the same amount of power in a resistive load as does a battery of the same yRMS value
• So, 120VRMS into a resistive loada resistive load dissipates as much power in the load as does a 120V
Introduction to Power Electronics© M. T. Thompson, 2009 93
as does a 120V battery
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RMS Value of Various Waveforms• Following are a bunch of waveforms typically found in power electronics, power systems, and motors, and their corresponding RMS valuescorresponding RMS values• Reference: R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, 2nd edition, Kluwer, 2001
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DC Current
• Battery
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Sinewave
• AC line
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Square Wave
• This type of waveform can be put out by a square wave converter or full-bridge converter
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DC with Ripple
• Buck converter inductor current (DC value + ripple)
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Triangular Ripple
• Capacitor ripple current in some converters (no DC value)
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Pulsating WaveformB k t i t it h t ( i ll i l )• Buck converter input switch current (assuming small ripple)
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Pulsating with Ripple
• i.e. buck converter switch currentcurrent• We can use this result to get RMS value of buck diode current
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Triangular
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Piecewise Calculation
• This works if the different components are at different frequencies
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Piecewise Calculation --- ExampleWh t i RMS l f DC i l ( h b f )?• What is RMS value of DC + ripple (shown before)?
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HarmonicsHarmonics• Harmonics are created by nonlinear circuits
– Rectifiers• Half-wave rectifier has first harmonic at 60 Hz• Full-wave has first harmonic at 120 Hz
– Switching DC/DC converters– Switching DC/DC converters• DC/DC operating at 100 kHz generally creates
harmonics at DC, 100 kHz, 200 kHz, 300 kHz, etc.Li h i b t t d b li filt• Line harmonics can be treated by line filters– Passive– Active
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Total Harmonic Distortion• Total harmonic distortion (THD)
– Ratio of the RMS value of all the nonfundamental frequency terms to the RMS value of thefrequency terms to the RMS value of the fundamental
2
2,1
21
2,
RMSRMSnRMSn
III
I
ITHD
−==
∑≠
,1,1 RMSRMS II
• Symmetrical square wave: THD = 48.3%1=I RMS
241
24
2
1
⎟⎠⎞
⎜⎝⎛−
=π
I
483.0
24
22 =
⎟⎠⎞
⎜⎝⎛
⎠⎝=
π
πTHD
Introduction to Power Electronics© M. T. Thompson, 2009 106
• Symmetrical triangle wave: THD = 12.1%
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Half-Wave Rectifier, Resistive Load• Simplest, cheapest rectifier• Line current has DC component; this current appears in neutralneutral • High harmonic content, Power factor = 0.7
avgPFP =
RMSRMS IVFP =..
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Half Wave Rectifier with Resistive Load --- Power Factor and Average Output VoltageFactor and Average Output Voltage
[ ] πωπ pktpk VVd =∫ )()()i (1
Average output voltage:
1 22⎞⎛ II
[ ]π
ωπ
ωωπ
πωω
pktt
pkpkd ttdtVv =−=>=< =
=∫ 00)cos(
2)()sin(
21
Power factor calculation:
4221 2
==
=⎟⎟⎠
⎞⎜⎜⎝
⎛=><
pkpk
pkpk
RIVV
RI
RI
P
21
2
22
=
==
pkRMS
RMS
II
V
707.01
4
2
=⎟⎞
⎜⎛
⎟⎞
⎜⎛
=><
=pkpk
pk
RMSRMS II
RI
IVPPF
Introduction to Power Electronics© M. T. Thompson, 2009 108
222 ⎟⎟⎠
⎜⎜⎝
⎟⎟⎠
⎜⎜⎝
pkpkRMSRMS
R
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Half-Wave Rectifier, Resistive Load --- Spectrum of Load VoltageLoad Voltage
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Half Wave Rectifier with RC Load• More practical rectifier• For large RC, this behaves like a peak detector
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Half Wave Rectifier with RC Load• Note poor power factor due to peaky line current• Note DC component of line current
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Half Wave Rectifier with RC Load --- Spectrum of Line CurrentCurrent
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Crest Factor• Another term sometimes used in power engineering• Ratio of peak value to RMS value
F i t f t 1 4• For a sinewave, crest factor = 1.4– Peak = 1; RMS = 0.707
• For a square wave, crest factor = 1– Peak = 1; RMS = 1
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Harmonics and THD - SinewaveHarmonics and THD Sinewave
1 5Number of harmonics N = 1 THD = 0 %
• THD = 0%
1
1.5
0
0.5
-0.5
0
-1 5
-1
Introduction to Power Electronics© M. T. Thompson, 2009 114
0 0.01 0.02 0.03 0.04 0.05 0.06 0.071.5
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Harmonics and THD - Sinewave + 3rd HarmonicHarmonics and THD Sinewave 3rd Harmonic
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Harmonics and THD --- Sinewave + 3rd + 5th Harmonic
• THD = 38.9%
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Harmonics --- Up to N = 103Harmonics --- Up to N = 103• THD = 48%
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Full-Wave Rectifier (Single Phase)Full-Wave Rectifier (Single Phase)
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Full-Wave Rectifier with Capacitor Filter
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6-Pulse (3-Phase) Rectifier• Typically used for higher-power applications where 3-
phase power is available
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12-Pulse RectifierT ll l d 6 l tifi• Two paralleled 6-pulse rectifiers
• 5th and 7th harmonics are eliminated• Only harmonics are the 11th, 13th, 23rd, 25th …y
Introduction to Power Electronics© M. T. Thompson, 2009 121
Reference: R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, 2d edition
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Techniques for Analysis of Power Electronics Circuits
• Power electronics systems are often switching, li d ith th t i t A i t fnonlinear, and with other transients. A variety of
techniques have been developed to help approximately analyze these circuitspp y y– Assumed states – Small ripple assumption– Periodic steady statePeriodic steady state
• After getting approximate answers, often circuit simulation is used
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Assumed States• In a circuit with diodes, etc. or other nonlinear
elements, how do you figure out what is happening ?G d th h k• Guess….and then check your guess
1 10 V1:10
120 VAC
Vout
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Small Ripple AssumptionSmall Ripple Assumption
• In power electronic circuits, generally our interest is in the average value of voltages and current if the ripplethe average value of voltages and current if the ripple is small compared to the nominal operating point.
• In DC/DC converters, often our goal is to regulate the average value of the output voltage vo. State-space averaging is a circuit approach to analyzing the local average behavior of circuit elements. In this method, g ,we make use of a running average, or:
t1∫−
=Tt
dvT
tv ττ )(1)(
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Periodic Steady StatePeriodic Steady State• In the periodic steady state assumption, we assume that
all startup transients have died out and that from period-p pto-period the inductor currents and capacitor voltages return to the same value.
• In other words for one part of the cycle the inductor• In other words, for one part of the cycle the inductor current ripples UP; for the second part of the cycle, the inductor current ripples DOWN.C l l t t d d it hi b• Can calculate converter dependence on switching by using volt-second balance.
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Motivation for DC/DC Converter: Offline Linear +5V, 50 Watt Regulator
VV
• Must accommodate:A
CCbus
LinearReg.
VoVbus
I d t i t i• Must accommodate:– Variation in line voltage
• Typically 10%
– Drop in rectifier transformerdropoutbus VVV +> 5
• In order to maintain regulation:
Drop in rectifier, transformer• Rectifier 1-2V total• Transformer drop depends on
load current
Ripple in bus voltage
• Regulator power dissipation:[ ]b IVVP −><≈– Ripple in bus voltage
D t lt f l t
• For <Vbus> = 7V and Io = 10A, P = 20 Watts !
bus
Lbus C
IV120
≈Δ
[ ] oobus IVVP ><≈
Introduction to Power Electronics© M. T. Thompson, 2009 126
– Dropout voltage of regulator• Typically 0.25-1V
P 20 Watts !
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Offline Switching +5V 50 Watt RegulatorOffline Switching +5V, 50 Watt Regulator• If switching regulator is 90% efficient, Preg = 5.6 Watts
(ignoring losses in diode bridge and transformer)(ignoring losses in diode bridge and transformer)• Other switching topologies can do better
AC Switching
Reg.VoVbus
Cbus
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PSIM SimulationPSIM Simulation
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PSIM Simulation
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Switcher ImplementationD
Vi
D
vo(t)+
-
RL
• Switch turns on and off with switching frequency fsw• D is “duty cycle ” or fraction of switching cycle thatD is duty cycle, or fraction of switching cycle that
switch is closedVi
vo(t)
<v (t)>
DT T T+DTt
vo(t)
• Average value of output <vo(t)> = DviAverage value of output vo(t) Dvi– Can provide real-time control of <vo(t)> by varying duty cycle
• Unfortunately, output is has very high ripple at switching frequency f
Introduction to Power Electronics© M. T. Thompson, 2009 130
switching frequency fsw
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Switcher Design IssuesSwitcher Design Issues• Lowpass filter provides effective ripple reduction in vo(t) if
LC >> 1/fLC >> 1/fsw• Unfortunately, this circuit has a fatal flaw…..
D
Vi
D
vo(t)+
RL
L
Ci o( )
-LC
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Buck ConverterBuck Converter• Add diode to allow continuous inductor current flow
when switch is open
V
D
v (t)+
R
L
CVi vo(t)
-
RLC
• This is a common circuit for voltage step-down applicationsE l f b k t i l t• Examples of buck converter given later
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Types of ConvertersTypes of Converters• Can have DC or AC inputs and outputs• AC ⇒ DC
– Rectifier• DC ⇒ DC
– Designed to convert one DC voltage to another DCDesigned to convert one DC voltage to another DC voltage
– Buck, boost, flyback, buck/boost, SEPIC, Cuk, etc.• DC ⇒ AC• DC ⇒ AC
– Inverter• AC ⇒ AC
– Light dimmers– Cycloconverters
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Ideal Power ConverterIdeal Power Converter• Converts voltages and currents without dissipating
power PPp– Efficiency = 100%
lossout
out
in
out
PPP
PP
+==ε
• Efficiency is very important, especially at high power levelsHi h ffi i lt i ll i (d t li• High efficiency results in smaller size (due to cooling requirements)
• Example: 100 kW converterp– 90% efficient dissipates 11.1 kW– 99% efficient dissipates 1010 W– 99 9% efficient dissipates 100 W
⎟⎠⎞
⎜⎝⎛ −= 11
εoutdiss PP
Introduction to Power Electronics© M. T. Thompson, 2009 134
– 99.9% efficient dissipates 100 W
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Buck ConverterBuck Converter• Also called “down converter”• Designed to convert a higher DC voltage to a lower DC
voltage• Output voltage controlled by modifying switching “duty
ratio” D DiLratio D
Vo
DLVcc
+C R
vc
-
C R
• We’ll figure out the details of how this works in later
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weeks
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Possible ImplementationsPossible Implementations• Many companies make buck controller chips (where
you supply external components) as well as complete y pp y p ) pmodules
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Real-World Buck Converter IssuesReal-World Buck Converter Issues• Real-world buck converter has losses in:
– MOSFETMOSFET• Conduction loss• Switching loss
I d t– Inductor• ESR
– Capacitor• ESR
– Diode• Diode ON voltageDiode ON voltage
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Converter Loss Mechanisms
• Input rectifier• Input filtering
• Control system – Controller
C t i d i– EMI filtering– Capacitor ESR
• Transformer
– Current sensing device• Switch
– MOSFET conduction Transformer– DC winding loss– AC winding loss
• Skin effect
loss– MOSFET switching loss– Avalanche loss• Skin effect
• Proximity effect– Core loss
Avalanche loss– Gate driving loss– Clamp/snubber
Di d• Hysteresis• Eddy currents
• Output filter
• Diode– Conduction loss– Reverse recovery
Introduction to Power Electronics© M. T. Thompson, 2009 138
Ou pu e– Capacitor ESR – Reverse current