Steady-State Analysis and Design of Non-Isolated PWM Converters, Isolated PWM Converters, and Resonant Converters 8
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Steady-State Analysisand Design ofNon-Isolated PWM Converters, Isolated PWM Converters, and Resonant Converters
8
Topics Technical Contents
Overview Course Outline References
Basics of PWM Dc-to-Dc Power Conversion
Dc-to-Dc Power Conversion PWM Dc-to-Dc Power Converters Features and Issues of PWM Dc-to-Dc Converters
Power StageComponent Basics
Semiconductor Switches Energy Storage and Transfer Devices Switching Circuits in Practice PSIM Simulations
Buck Converter Basics
Ideal Step-Down Dc-to-Dc Power Conversion Buck Converter: Step Down Dc-to-Dc Converter Buck Converter in Steady State PSIM Simulations
과정시간표 1st day
9
2nd day
Topics Technical Contents
Buck Converter in Practice
Buck Converter in Discontinuous Conduction Mode Closed-Loop Control of Buck Converter PSIM Simulations
Non-Isolated PWMConverters
Boost Converter Buck/Boost Converter Three Basic PWM Converters PSIM Simulations
Isolated PWM Converters
Flyback Converter Full-Bridge Converter Half-Bridge Converter PSIM Simulations
Isolated PWM Converters
Push-Pull Converter Tertiary-Winding Reset Forward Converter Two-Switch Forward Converter PSIM Simulations
과정 시간표
10
3rd day
Topics Technical Contents
Basics of Resonant PowerConversion
Resonant Power Conversion Fundamentals Fundamentals of RLC Resonant Circuits Basics of Resonant Power Conversion Circuits
Resonant Dc-to-AcInverters
Resonant Power Inversion Fundamentals Resonant Power Inverters ZCS and ZVS Switching PSIM Simulations
Resonant Dc-to-DcConverters
Resonant Power Inversion Circuits Resonant Power Conversion Circuits LLC Series Resonant Converters PSIM Simulations
Course Summary and Final Test Course Summary Final Test
과정 시간표
11
12
과정 학습목표
다양한 비절연형 PWM 컨버터의 정상상태 해석과 전력단
설계 능력을 배양한다.
다양한 절연형 PWM 컨버터의 정상상태 해석과 전력단
설계 능력을 배양한다.
공진형 전력변환의 기본원리를 이해하고 공진형 컨버터의 동작과 설계방법을
학습한다. LLC 직렬 공진형 컨버터의 동작과 설계를 익힌다.
본 과정의 학습목표는 다음과 같습니다.
13
Steady-State Analysisand Design ofNon-Isolated PWM Converters, Isolated PWM Converters, and Resonant Converters
Buck converter
Boost converter
Buck/boostconverterPFC rectifiers
Full-bridge converterHalf-bridge converterPush-pull converterForward converters
Flybackconverter
Seminar Outline
PWM Dc-to-Dc Converters
14
Series resonant inverter
Parallel loadedseires resonant converter
Current rectifier
Series resonant converter
Capacitive filter
LLC seriesresonant converter
LCC seriesresonant converter
Seminar Outline
Resonant Dc-to-Dc Converters
15
The Book
LG ArchivesVideosPost-Lecture Slides
·
KNU Website:
Classes: Power Electronics Power Conv
http://m80.knu.
ersion Circuits
ac.kr/~SMPC
Electronics
·
References
16
Instructor
17
PWM Dc-to-Dc Power Conversion
18
Outline
1) PWM Dc-to-Dc Power Conversion
Dc-to-Dc Power Conversion
PWM Technique
2) Dc-to-Dc Power Conversion System
3) Features and Issues of PWM Dc-to-Dc Converter
19
PWM Dc-to-Dc Power Conversion
20
Electric Bulb Drive Circuit
Controller
xROI
BV Oo
O
VRI
OV
Ohmic loss a t( )
: loss inx out O B O O
O B O
P P P I V I V
I V
R
V
- --
= ==
Energy source and loadSource: battery with variable output voltage Load: 12 V electric bulb
( ( )
B
O
V V V
V V
= -=
·18 30
12
)
Conventional resistive solution·
12Control law: oO B
x o
RV = V = VR + R
21
Problem of Resistive Solution
Controller
xROI
BV 60 W@12 VOV
Efficiency evaluationAssumptions
Battery voltage: = 30 V Bulb: 60 W p and
( ) ( ) ower at 12 V voltage level
Efficiency:
/O O
O B O
out out
in out
B
loss
loss
V V I A
I V V W
P P
P
P
P P
V
·
= = =- - =
= = =+ +
= =
12 60 12 5
5 30 12 90
60
60 9.=0 4
0
Consequence of poor efficiencyHeat generation Requirement of coolingsystem
Increase in weight and size of bulb drive circuit
22
SPDT Switch
Single-pole double-throw (SPDT) switch contains one pole which is always connectedto one of the two contacts: the throw and the throw .a p
·
SPDT switch is usually impleme MOSFET-nted u diode s ping .air·
23
Dc-to-Dc Power Conversion as Alternative Solution
( ) { ( )} ( ) 12averageControl aw:l onO O X X B
s
Tv t V v t v t V VT
No power loss in circ it %u 100
Controller
BV
Xv
BV
Ov
Ov
Xv
0 V 0 V
onT
offT
Ov
oR
oR
Two steps in dc-to-dc power conversion i) conversionof dc voltage into a pulse waveform ii) filtering of the pulse waveform into another dc voltage
24
Pulsewidth Modulation for Output Voltage Regulation
24 VBV
10 ssT
30 V
5 s
onT
24 V
Xv
Ov
Xv10 ssT
10 ssT
10 ssT
5 s
onT
4 s
onT
Ov
12on onB B
s s
T TV VT T
Control law: V
Output remains constant in spite of input voltage variationOutput voltage regulation using pulsewidth modulation (PWM) scheme.
25
PWM Dc-to-Dc Converter
Powerconversion: changing electrical energy/power from one form to another formusing electric devices
Power electronics: electronic engineering that deals with all types of pow whilequesting the maximumpossible convers
erconverioneffic
siony
sienc
Dc-to-dc power conversion: process of changing the voltage level of adc sourceto another value
PWMdc-to-dc power converter: dc-to-dc conversion circuit operating under the PWM technique
26
Classification of Power Conversion
ACRectification
Dc-to-dcconversion
InversionAC DC
DC
Cyclo-conversion
27
Dc-to-Dc Power Conversion SystemD
c-to
-Dc
Pow
er C
onve
rsio
n S
yste
m
Dcsource
Power stageLoad
Controller
Dc-to-dc converter
Dc source with non-ideal characteristicsStandalone dc source:Rectified ac source:
Load as adynamic current sink withgeneralimpedance characteristicsElectric equipmemt: non-resistive load impedance characteristicsDigital logic system: dynamic changes in load current
28
Dc-to-Dc Power Conversion SystemD
c-to
-Dc
Pow
er C
onve
rsio
n S
yste
m
Dc-to-dc converter as a voltage sourceFunctions of dc-to power conversion and ener-dc gy fconverter: low control
Components of dc-to-dc converterPower stage: semiconductor switches
energy storage/transfer deMOSFETs and diodes
inductors, capacitors, and transformer
cives
Cons
trol
ler: ICs and discrete components
Dcsource
Power stageLoad
Controller
Dc-to-dc converter
29
Features and Issues of PWM Dc-to-Dc ConverterD
c-to
-Dc
Pow
er C
onve
rsio
n S
yste
mPower stage components
Semiconductor devices:Inductors and capacitors:Transformers:
Power stage configurationsAccommodation of input voltage and load current requirementsVery large or small voltage conversion ratioGalvanic isolation between source and load
Dynamic modeling and analysisClosed-loop feedback control for output regulationStability and dynamic performanceDynamic modeling to embrace conventional analysis techniques
stability, transfer functions, and transient respoDynamic performance and control design
Dynamic performance:Feedback control design for optimal dynamic perform
nse
esanc
30
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