R. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder


 Kristina Montgomery
 1 years ago
 Views:
Transcription
1 R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
2 Boostderived isolated converters A wide variety of boostderived isolated dcdc converters can be derived, by inversion of source and load of buckderived isolated converters: fullbridge and halfbridge isolated boost converters inverse of forward converter: the reverse converter pushpull boostderived converter Of these, the fullbridge and pushpull boostderived isolated converters are the most popular, and are briefly discussed here. 66
3 Fullbridge transformerisolated boostderived converter i(t) L v L (t) Q 1 Q 3 1 : n D 1 i o (t) v T (t) C R v : n Q 2 Q 4 D 2 Circuit topologies are equivalent to those of nonisolated boost converter With 1:1 turns ratio, inductor current i(t) and output current i o (t) waveforms are identical to nonisolated boost converter 67
4 Transformer reset mechanism v T (t) v L (t) i(t) I i o (t) Conducting devices: Q DT s Q 2 Q 3 Q 4 V/n V/n I/n D V/n V/n I/n D'T s DT s D'T s T s Q 1 Q 1 Q 2 T s Q 4 Q 2 Q 3 Q 4 Q 3 D 2 t As in fullbridge buck topology, transformer voltsecond balance is obtained over two switching periods. During first switching period: transistors Q 1 and Q 4 conduct for time DT s, applying voltseconds VDT s to secondary winding. During next switching period: transistors Q 2 and Q 3 conduct for time DT s, applying voltseconds VDT s to secondary winding.
5 Conversion ratio M(D) v L (t) i(t) I V/n V/n Application of voltsecond balance to inductor voltage waveform: v L = D D' V n = 0 Solve for M(D): Conducting devices: DT s Q 1 Q 2 Q 3 Q 4 D'T s DT s D'T s T s Q 1 D 1 Q 1 Q 2 T s Q 4 Q 2 Q 3 Q 4 Q 3 D 2 t M(D)= V = n D' boost with turns ratio n 69
6 Pushpull boostderived converter i o (t) L v T (t) i(t) C R v L (t) v T (t) Q 1 1 : n D 1 V Q 2 D 2 M(D)= V = n D' 70
7 Pushpull converter based on WatkinsJohnson converter Q 1 1 : n D 1 C R V Q 2 D 2 71
8 Isolated versions of the SEPIC and Cuk converter Basic nonisolated SEPIC L 1 C 1 D 1 L 2 C 2 R v Q 1 L 1 C 1 1 : n D 1 Isolated SEPIC i 1 i p i s C 2 R v Q 1 72
9 Isolated SEPIC i p (t) i 1 L 1 C 1 i 1 i 2 i p 1 : n i s D 1 i 2 Q 1 L M = L 2 Ideal Transformer model C 2 R v i s (t) i 1 (t) 0 (i 1 i 2 ) / n I 1 M(D)= V = nd D' i 2 (t) I 2 Conducting devices: DT s T s D'T s Q 1 D 1 t 73
10 Inverse SEPIC 1 Nonisolated inverse SEPIC 2 V Isolated inverse SEPIC 1 : n C 1 L 2 D 1 C 2 R v Q 1 74
11 Obtaining isolation in the Cuk converter L 1 L 2 Nonisolated Cuk converter C 1 Q D 1 1 C 2 R v L 1 L 2 Split capacitor C 1 into series capacitors C 1a and C 1b Q 1 C 1a C 1b D 1 C 2 R v 75
12 Isolated Cuk converter L 1 L 2 Insert transformer between capacitors C 1a and C 1b Q 1 C 1a C 1b D 1 C 2 R v M(D)= V = nd D' 1 : n Discussion Capacitors C 1a and C 1b ensure that no dc voltage is applied to transformer primary or secondary windings Transformer functions in conventional manner, with small magnetizing current and negligible energy storage within the magnetizing inductance 76
13 6.4. Converter evaluation and design For a given application, which converter topology is best? There is no ultimate converter, perfectly suited for all possible applications Trade studies Rough designs of several converter topologies to meet the given specifications An unbiased quantitative comparison of worstcase transistor currents and voltages, transformer size, etc. Comparison via switch stress, switch utilization, and semiconductor cost Spreadsheet design 77
14 Converter design using computer spreadsheet Given ranges of and P load, as well as desired value of V and other quantities such as switching frequency, ripple, etc., there are two basic engineering design tasks: Compare converter topologies and select the best for the given specifications Optimize the design of a given converter A computer spreadsheet is a very useful tool for this job. The results of the steadystate converter analyses of Chapters 16 can be entered, and detailed design investigations can be quickly performed: Evaluation of worstcase stresses over a range of operating points Evaluation of design tradeoffs 88
15 Spreadsheet design example Specifications Maximum input voltage Minimum input voltage Output voltage V Maximum load power P load Minimum load power P load Switching frequency f s Maximum output ripple v 390 V 260 V 15 V 200 W 20 W 100 khz 0.1 V Input voltage: rectified 230 Vrms ±20% Regulated output of 15 V Rated load power 200 W Must operate at 10% load Select switching frequency of 100 khz Output voltage ripple 0.1V Compare singletransistor forward and flyback converters in this application Specifications are entered at top of spreadsheet 89
16 Forward converter design, CCM n 1 : n 2 : n 3 D 2 L D 3 C R V Q 1 D 1 Design variables Reset winding turns ratio n 2 /n 1 1 Turns ratio n 3 /n Inductor current ripple i 2A ref to sec Design for CCM at full load; may operate in DCM at light load 90
17 Flyback converter design, CCM 1:n D 1 L M C V Q1 Design variables Turns ratio n 2 /n Inductor current ripple i 3 A ref to sec Design for CCM at full load; may operate in DCM at light load 91
18 Enter results of converter analysis into spreadsheet (Forward converter example) Maximum duty cycle occurs at minimum and maximum P load. Converter then operates in CCM, with D = n 1 n 3 V Vg Inductor current ripple is Solve for L: i = D'VT s 2L L = D'VT s 2 i i is a design variable. For a given i, the equation above can be used to determine L. To ensure CCM operation at full load, i should be less than the fullload output current. C can be found in a similar manner. 92
19 Forward converter example, continued Check for DCM at light load. The solution of the buck converter operating in DCM is These equations apply equally well to the forward converter, provided that all quantities are referred to the transformer secondary side. Solve for D: D = V = n 3 n K D 2 with K =2L / RT s, and R = V 2 / P load 2 K 2 2n 3 n 1 V 1 1 in DCM D = n 1 n 3 in CCM at a given operating point, the actual duty cycle is the small of the values calculated by the CCM and DCM equations above. Minimum D occurs at minimum P load and maximum. V Vg 93
20 More regarding forward converter example Worstcase component stresses can now be evaluated. Peak transistor voltage is max v Q1 = 1 n 1 n 2 RMS transistor current is I Q1,rms = n 3 D I 2 i n 1 3 (this neglects transformer magnetizing current) Other component stresses can be found in a similar manner. Magnetics design is left for a later chapter. 2 n 3 n 1 D I 94
21 Results: forward and flyback converter spreadsheets Forward converter design, CCM Flyback converter design, CCM Design variables Design variables Reset winding turns ratio n 2 /n 1 1 Turns ratio n 2 /n Turns ratio n 3 /n Inductor current ripple i 3 A ref to sec Inductor current ripple i 2 A ref to sec Results Results Maximum duty cycle D Maximum duty cycle D Minimum D, at full load Minimum D, at full load Minimum D, at minimum load Minimum D, at minimum load Worstcase stresses Worstcase stresses Peak transistor voltage v Q1 780 V Peak transistor voltage v Q1 510 V Rms transistor current i Q A Rms transistor current i Q A Transistor utilization U Transistor utilization U Peak diode voltage v D2 49 V Peak diode voltage v D1 64 V Rms diode current i D2 9.1 A Rms diode current i D A Peak diode voltage v D3 49 V Peak diode current i D A Rms diode current i D A Rms output capacitor current i C 1.15 A Rms output capacitor current i C 9.1 A 95
22 Discussion: transistor voltage Flyback converter Ideal peak transistor voltage: 510V Actual peak voltage will be higher, due to ringing causes by transformer leakage inductance An 800V or 1000V MOSFET would have an adequate design margin Forward converter Ideal peak transistor voltage: 780V, 53% greater than flyback Few MOSFETs having voltage rating of over 1000 V are available when ringing due to transformer leakage inductance is accounted for, this design will have an inadequate design margin Fix: use twotransistor forward converter, or change reset winding turns ratio A conclusion: reset mechanism of flyback is superior to forward 96
23 Discussion: rms transistor current Forward Flyback 1.13A worstcase transistor utilization A worst case, 22% higher than forward transistor utilization CCM flyback exhibits higher peak and rms currents. Currents in DCM flyback are even higher 97
24 Discussion: secondaryside diode and capacitor stresses Forward Flyback peak diode voltage 49V rms diode current 9.1A / 11.1A rms capacitor current 1.15A peak diode voltage 64V rms diode current 16.3A peak diode current 22.2A rms capacitor current 9.1A Secondaryside currents, especially capacitor currents, limit the practical application of the flyback converter to situations where the load current is not too great. 98
25 Part II Converter Dynamics and Control 7. AC equivalent circuit modeling 8. Converter transfer functions 9. Controller design 10. Ac and dc equivalent circuit modeling of the discontinuous conduction mode 11. Current programmed control 1 Chapter 7: AC equivalent circuit modeling
26 Chapter 7. AC Equivalent Circuit Modeling 7.1. Introduction 7.2. The basic ac modeling approach 7.3. Example: A nonideal flyback converter 7.4. Statespace averaging 7.5. Circuit averaging and averaged switch modeling 7.6. The canonical circuit model 7.7. Modeling the pulsewidth modulator 7.8. Summary of key points 2 Chapter 7: AC equivalent circuit modeling
27 7.1. Introduction Objective: maintain v(t) equal to an accurate, constant value V. There are disturbances: in v g (t) in R There are uncertainties: in element values in in R Power input v g (t) A simple dcdc regulator system, employing a buck converter transistor gate driver δ(t) δ(t) Switching converter pulsewidth modulator v c (t) compensator v c dt s T s t t Controller G c (s) v(t) voltage reference Load v ref R v feedback connection 3 Chapter 7: AC equivalent circuit modeling
28 Applications of control in power electronics Dcdc converters Regulate dc output voltage. Control the duty cycle d(t) such that v(t) accurately follows a reference signal v ref. Dcac inverters Regulate an ac output voltage. Control the duty cycle d(t) such that v(t) accurately follows a reference signal v ref (t). Acdc rectifiers Regulate the dc output voltage. Regulate the ac input current waveform. Control the duty cycle d(t) such that i g (t) accurately follows a reference signal i ref (t), and v(t) accurately follows a reference signal v ref. 4 Chapter 7: AC equivalent circuit modeling
29 Objective of Part II Develop tools for modeling, analysis, and design of converter control systems Need dynamic models of converters: How do ac variations in v g (t), R, or d(t) affect the output voltage v(t)? What are the smallsignal transfer functions of the converter? Extend the steadystate converter models of Chapters 2 and 3, to include CCM converter dynamics (Chapter 7) Construct converter smallsignal transfer functions (Chapter 8) Design converter control systems (Chapter 9) Model converters operating in DCM (Chapter 10) Currentprogrammed control of converters (Chapter 11) 5 Chapter 7: AC equivalent circuit modeling
30 Modeling Representation of physical behavior by mathematical means Model dominant behavior of system, ignore other insignificant phenomena Simplified model yields physical insight, allowing engineer to design system to operate in specified manner Approximations neglect small but complicating phenomena After basic insight has been gained, model can be refined (if it is judged worthwhile to expend the engineering effort to do so), to account for some of the previously neglected phenomena 6 Chapter 7: AC equivalent circuit modeling
31 Neglecting the switching ripple Suppose the duty cycle is modulated sinusoidally: d(t)=dd m cos ω m t The resulting variations in transistor gate drive signal and converter output voltage: gate drive where D and D m are constants, D m << D, and the modulation frequency ω m is much smaller than the converter switching frequency ω s = 2πf s. actual waveform v(t) including ripple averaged waveform <v(t)> Ts with ripple neglected t t 7 Chapter 7: AC equivalent circuit modeling
32 Output voltage spectrum with sinusoidal modulation of duty cycle spectrum of v(t) modulation frequency and its harmonics switching frequency and sidebands switching harmonics { { { ω m ω s ω Contains frequency components at: Modulation frequency and its harmonics Switching frequency and its harmonics Sidebands of switching frequency 8 With small switching ripple, highfrequency components (switching harmonics and sidebands) are small. If ripple is neglected, then only lowfrequency components (modulation frequency and harmonics) remain. Chapter 7: AC equivalent circuit modeling
33 Objective of ac converter modeling Predict how lowfrequency variations in duty cycle induce lowfrequency variations in the converter voltages and currents Ignore the switching ripple Ignore complicated switching harmonics and sidebands Approach: Remove switching harmonics by averaging all waveforms over one switching period 9 Chapter 7: AC equivalent circuit modeling
34 Averaging to remove switching ripple Average over one switching period to remove switching ripple: L di L(t) Ts dt = v L (t) Ts Note that, in steadystate, v L (t) Ts =0 i C (t) Ts =0 C dv C(t) Ts dt where = i C (t) Ts by inductor voltsecond balance and capacitor charge balance. x L (t) Ts = 1 T s t t T s x(τ) dτ 10 Chapter 7: AC equivalent circuit modeling
35 Nonlinear averaged equations The averaged voltages and currents are, in general, nonlinear functions of the converter duty cycle, voltages, and currents. Hence, the averaged equations L di L(t) Ts dt C dv C(t) Ts dt = v L (t) Ts = i C (t) Ts constitute a system of nonlinear differential equations. Hence, must linearize by constructing a smallsignal converter model. 11 Chapter 7: AC equivalent circuit modeling
36 Smallsignal modeling of the BJT Nonlinear EbersMoll model C Linearized smallsignal model, active region C i B β F i B i B β F i B B β R i B B r E E E 12 Chapter 7: AC equivalent circuit modeling
37 Buckboost converter: nonlinear static controltooutput characteristic D quiescent operating point linearized function Example: linearization at the quiescent operating point D = 0.5 V actual nonlinear characteristic 13 Chapter 7: AC equivalent circuit modeling
38 Result of averaged smallsignal ac modeling Smallsignal ac equivalent circuit model V L g V d(t) 1 : D D' : 1 v g (t) Id(t) Id(t) C v(t) R buckboost example 14 Chapter 7: AC equivalent circuit modeling
Chapter 6: Converter circuits
Chapter 6. Converter Circuits 6.1. Circuit manipulations 6.2. A short list of converters 6.3. Transformer isolation 6.4. Converter evaluation and design 6.5. Summary of key points Where do the boost, buckboost,
More informationElements of Power Electronics PART II: Topologies and applications
Elements of Power Electronics PART II: Topologies and applications Fabrice Frébel (fabrice.frebel@ulg.ac.be) September 2 st, 207 PART II: Topologies and applications Chapter 6: Converter Circuits Applications
More informationAdvances in Averaged Switch Modeling
Advances in Averaged Switch Modeling Robert W. Erickson Power Electronics Group University of Colorado Boulder, Colorado USA 803090425 rwe@boulder.colorado.edu http://ecewww.colorado.edu/~pwrelect 1
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder 18.5 RMS values of rectifier waveforms Doublymodulated transistor current waveform, boost rectifier:
More informationFundamentals of Power Electronics
Fundamentals of Power Electronics SECOND EDITION Robert W. Erickson Dragan Maksimovic University of Colorado Boulder, Colorado Preface 1 Introduction 1 1.1 Introduction to Power Processing 1 1.2 Several
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder 18.2.2 DCM flyback converter v ac i ac EMI filter i g v g Flyback converter n : 1 L D 1 i v C R
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder 17.1 The singlephase fullwave rectifier i g i L L D 4 D 1 v g Z i C v R D 3 D 2 Fullwave rectifier
More informationPower Management for Computer Systems. Prof. C Wang
ECE 5990 Power Management for Computer Systems Prof. C Wang Fall 2010 Course Outline Fundamental of Power Electronics cs for Computer Systems, Handheld Devices, Laptops, etc More emphasis in DC DC converter
More informationS. General Topological Properties of Switching Structures, IEEE Power Electronics Specialists Conference, 1979 Record, pp , June 1979.
Problems 179 [22] [23] [24] [25] [26] [27] [28] [29] [30] J. N. PARK and T. R. ZALOUM, A Dual Mode Forward/Flyback Converter, IEEE Power Electronics Specialists Conference, 1982 Record, pp. 313, June
More informationLecture 6 ECEN 4517/5517
Lecture 6 ECEN 4517/5517 Experiment 4: inverter system Battery 12 VDC HVDC: 120200 VDC DCDC converter Isolated flyback DCAC inverter Hbridge v ac AC load 120 Vrms 60 Hz d d Feedback controller V ref
More informationChapter 1: Introduction
1.1. Introduction to power processing 1.2. Some applications of power electronics 1.3. Elements of power electronics Summary of the course 2 1.1 Introduction to Power Processing Power input Switching converter
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder Inclusion of Switching Loss in the Averaged Equivalent Circuit Model The methods of Chapter 3 can
More informationConstantFrequency SoftSwitching Converters. Softswitching converters with constant switching frequency
ConstantFrequency SoftSwitching Converters Introduction and a brief survey Activeclamp (auxiliaryswitch) softswitching converters, Activeclamp forward converter Textbook 20.4.2 and online notes
More informationLecture 4 ECEN 4517/5517
Lecture 4 ECEN 4517/5517 Experiment 3 weeks 2 and 3: interleaved flyback and feedback loop Battery 12 VDC HVDC: 120200 VDC DCDC converter Isolated flyback DCAC inverter Hbridge v ac AC load 120 Vrms
More informationThe Flyback Converter
The Flyback Converter Course Project Power Electronics Design and Implementation Report by Kamran Ali 13100174 Muhammad Asad Lodhi 13100175 Ovais bin Usman 13100026 Syed Bilal Ali 13100026 Advisor Nauman
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder pn junction! Junction diode consisting of! pdoped silicon! ndoped silicon! A pn junction where
More informationCHAPTER 3. SINGLESTAGE PFC TOPOLOGY GENERALIZATION AND VARIATIONS
CHAPTER 3. SINGLESTAGE PFC TOPOLOG GENERALIATION AND VARIATIONS 3.1. INTRODUCTION The original DCM S 2 PFC topology offers a simple integration of the DCM boost rectifier and the PWM DC/DC converter.
More informationECE514 Power Electronics Converter Topologies. Part 2 [100 pts] Design of an RDC snubber for flyback converter
ECE514 Power Electronics Converter Topologies Homework Assignment #4 Due date October 31, 2014, beginning of the lecture Part 1 [100 pts] Redo Term Test 1 (attached) Part 2 [100 pts] Design of an RDC snubber
More informationLecture 19  Singlephase squarewave inverter
Lecture 19  Singlephase squarewave inverter 1. Introduction Inverter circuits supply AC voltage or current to a load from a DC supply. A DC source, often obtained from an ACDC rectifier, is converted
More informationChapter 6: Converter circuits
hapter 6. onerter ircuits 6.. ircuit manipulations 6.. A short list of conerters 6.3. Transformer isolation 6.4. onerter ealuation and design 6.5. Summary of key points Where do the boost, buckboost,
More informationEEL 646 POWER ELECTRONICS II. Issa Batarseh. January 13, 2015
EEL 646 POWER ELECTRONICS II Issa Batarseh January 13, 2015 Agenda About the course Syllabus Review Course Topics Review of Power Electronics I Questions Introduction (cont d) Introduction (cont d) 5
More informationR. W. Erickson. Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder
R. W. Erickson Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder Construction of transfer function v 2 (s) v (s) = Z 2Z Z Z 2 Z = Z out Z R C Z = L Q = R /R 0 f
More informationECEN4797/5797 Lecture #11
ECEN4797/5797 Lecture #11 Announcements Oncampus students: pick up graded HW2, turn in HW3 Homework 4 is due in class on Friday, Sept. 23. The graceperiod for offcampus students expires 5pm (Mountain)
More informationCONTENTS. Chapter 1. Introduction to Power Conversion 1. Basso_FM.qxd 11/20/07 8:39 PM Page v. Foreword xiii Preface xv Nomenclature
Basso_FM.qxd 11/20/07 8:39 PM Page v Foreword xiii Preface xv Nomenclature xvii Chapter 1. Introduction to Power Conversion 1 1.1. Do You Really Need to Simulate? / 1 1.2. What You Will Find in the Following
More informationAnalysis and Simulation of FullBridge Boost Converter using Matlab
64 Analysis and Simulation of FullBridge Boost Converter using Matlab O. Alavi, and S. Dolatabadi Abstract Improvement of high power and high performance applications causes attention to the DCDC converter
More informationEE 486 Power Electronics Final Exam Coverage Prof. Ali MehriziSani
EE 486 Power Electronics Final Exam Coverage Prof. Ali MehriziSani mehrizi@eecs.wsu.edu School of Electrical Engineering and Computer Science April 26, 2012 Illusions 2 of 18 Final Exam Coverage All Material
More informationSmall signal modeling and steady state stability analysis of PWM based switch model Boost converter using Pspise
Small signal modeling and steady state stability analysis of PWM based switch model Boost converter using Pspise Mrs. Swapna Manurkar Assistant Professor, Electrical Engineering, Vishwaniketan s Institute
More informationCHAPTER 6 BRIDGELESS PFC CUK CONVERTER FED PMBLDC MOTOR
105 CHAPTER 6 BRIDGELESS PFC CUK CONVERTER FED PMBLDC MOTOR 6.1 GENERAL The line current drawn by the conventional diode rectifier filter capacitor is peaked pulse current. This results in utility line
More informationReduction of Voltage Stresses in BuckBoostType Power Factor Correctors Operating in Boundary Conduction Mode
Reduction of oltage Stresses in BuckBoostType Power Factor Correctors Operating in Boundary Conduction Mode ars Petersen Institute of Electric Power Engineering Technical University of Denmark Building
More information466 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 13, NO. 3, MAY A SingleSwitch FlybackCurrentFed DC DC Converter
466 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 13, NO. 3, MAY 1998 A SingleSwitch FlybackCurrentFed DC DC Converter Peter Mantovanelli Barbosa, Member, IEEE, and Ivo Barbi, Senior Member, IEEE Abstract
More informationSwitched Mode Power Conversion Prof. L. Umanand Department of Electronics Systems Engineering Indian Institute of Science, Bangalore
Switched Mode Power Conversion Prof. L. Umanand Department of Electronics Systems Engineering Indian Institute of Science, Bangalore Lecture 1 Introduction to DCDC converter Good day to all of you, we
More informationLeMeniz Infotech. 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry Call: , ,
Analysis of the Interleaved Isolated Boost Converter with Coupled Inductors Abstract Introduction: A configuration with many parallelconnected boostflyback converters sharing a single active clamp has
More information1. The currentdoubler rectifier can be used to double the load capability of isolated dc dc converters with bipolar secondaryside
Highlights of the Chapter 4 1. The currentdoubler rectifier can be used to double the load capability of isolated dc dc converters with bipolar secondaryside voltage. Some industrygenerated papers recommend
More informationSIMULATION WITH THE CUK TOPOLOGY ECE562: Power Electronics I COLORADO STATE UNIVERSITY. Modified in Fall 2011
SIMULATION WITH THE CUK TOPOLOGY ECE562: Power Electronics I COLORADO STATE UNIVERSITY Modified in Fall 2011 ECE 562 Cuk Converter (NL5 Simulation) Laboratory Page 1 PURPOSE: The purpose of this lab is
More informationConventional SingleSwitch Forward Converter Design
Maxim > Design Support > Technical Documents > Application Notes > Amplifier and Comparator Circuits > APP 3983 Maxim > Design Support > Technical Documents > Application Notes > PowerSupply Circuits
More informationFinal Exam. Anyone caught copying or allowing someone to copy from them will be ejected from the exam.
Final Exam EECE 493101 December 4, 2008 Instructor: Nathan Ozog Name: Student Number: Read all of the following information before starting the exam: The duration of this exam is 3 hours. Anyone caught
More informationA NOVEL BUCKBOOST INVERTER FOR PHOTOVOLTAIC SYSTEMS
A NOVE BUCKBOOST INVERTER FOR PHOTOVOTAIC SYSTEMS iuchen Chang, Zhumin iu, Yaosuo Xue and Zhenhong Guo Dept. of Elec. & Comp. Eng., University of New Brunswick, Fredericton, NB, Canada Phone: (506) 447345,
More informationChapter 2 Buck PWM DC DC Converter
Chapter 2 Buck PWM DC DC Converter H. Wang, Power Management and Highspeed I/O in CMOS Systems 1/25 Buck Circuit and Its equivalent circuits CCM: continuous conduction mode DCM: discontinuous conduction
More informationCHAPTER 2 DESIGN AND MODELING OF POSITIVE BUCK BOOST CONVERTER WITH CASCADED BUCK BOOST CONVERTER
17 CHAPTER 2 DESIGN AND MODELING OF POSITIVE BUCK BOOST CONVERTER WITH CASCADED BUCK BOOST CONVERTER 2.1 GENERAL Designing an efficient DC to DC buckboost converter is very much important for many realtime
More informationCHAPTER 2 GENERAL STUDY OF INTEGRATED SINGLESTAGE POWER FACTOR CORRECTION CONVERTERS
CHAPTER 2 GENERAL STUDY OF INTEGRATED SINGLESTAGE POWER FACTOR CORRECTION CONVERTERS 2.1 Introduction Conventional diode rectifiers have rich input harmonic current and cannot meet the IEC PFC regulation,
More informationDC DC POWER CONVERTERS CHOPPERS SWITCHING POWER SUPPLIES INTRODUCTION
DC DC POWER CONVERTERS CHOPPERS SWITCHING POWER SUPPLIES INTRODUCTION Direct current direct current (dc dc) power converters are employed in a variety of applications, including power supplies for personal
More informationFig.1. A Block Diagram of dcdc Converter System
ANALYSIS AND SIMULATION OF BUCK SWITCH MODE DC TO DC POWER REGULATOR G. C. Diyoke Department of Electrical and Electronics Engineering Michael Okpara University of Agriculture, Umudike Umuahia, Abia State
More informationLecture 41 SIMPLE AVERAGING OVER T SW to ACHIEVE LOW FREQUENCY MODELS
Lecture 41 SIMPLE AVERAGING OVER T SW to ACHIEVE LOW FREQUENCY MODELS. Goals and Methodology to Get There 0. Goals 0. Methodology. BuckBoost and Other Converter Models 0. Overview of Methodology 0. Example
More informationBridgeless Cuk Power Factor Corrector with Regulated Output Voltage
Bridgeless Cuk Power Factor Corrector with Regulated Output Voltage Ajeesh P R 1, Prof. Dinto Mathew 2, Prof. Sera Mathew 3 1 PG Scholar, 2,3 Professors, Department of Electrical and Electronics Engineering,
More informationChapter 3 : Closed Loop Current Mode DC\DC Boost Converter
Chapter 3 : Closed Loop Current Mode DC\DC Boost Converter 3.1 Introduction DC/DC Converter efficiently converts unregulated DC voltage to a regulated DC voltage with better efficiency and high power density.
More informationELEC387 Power electronics
ELEC387 Power electronics Jonathan Goldwasser 1 Power electronics systems pp.3 15 Main task: process and control flow of electric energy by supplying voltage and current in a form that is optimally suited
More informationTutorial 5  Isolated DCDC Converters and Inverters
University of New South Wales School of Electrical Engineering and Telecommunications Tutorial 5  Isolated DCDC Converters and Inverters Flyback Converter N2 3 1. A dcdc flyback converter has a turns
More informationLecture 8 ECEN 4517/5517
Lecture 8 ECEN 4517/5517 Experiment 4 Lecture 7: Stepup dcdc converter and PWM chip Lecture 8: Design of analog feedback loop Part I Controller IC: Demonstrate operating PWM controller IC (UC 3525) Part
More informationELEC4240/ELEC9240 POWER ELECTRONICS
THE UNIVERSITY OF NEW SOUTH WALES FINAL EXAMINATION JUNE/JULY, 2003 ELEC4240/ELEC9240 POWER ELECTRONICS 1. Time allowed: 3 (three) hours 2. This paper has six questions. Answer any four. 3. All questions
More informationResonant Power Conversion
Resonant Power Conversion Prof. Bob Erickson Colorado Power Electronics Center Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder Outline. Introduction to resonant
More informationA New Quadratic Boost Converter with PFC Applications
Proceedings of the th WSEAS International Conference on CICUITS, uliagmeni, Athens, Greece, July , 6 (pp38) A New Quadratic Boost Converter with PFC Applications DAN LASCU, MIHAELA LASCU, IOAN LIE, MIHAIL
More informationEE155/255 F16 Midterm
EE155/255 F16 Midterm Name: (please print) In recognition of and in the spirit of the Stanford University Honor Code, I certify that I will neither give nor receive unpermitted aid on this exam. Signature:
More informationSingle Phase Bridgeless SEPIC Converter with High Power Factor
International Journal of Emerging Engineering Research and Technology Volume 2, Issue 6, September 2014, PP 117126 ISSN 23494395 (Print) & ISSN 23494409 (Online) Single Phase Bridgeless SEPIC Converter
More informationLECTURE 40 Introduction to Converter Dynamics A. AC Model Construction 1. Actual Switch mode NonLinear System 2. Small AC Models by two Analytical
LECTURE 40 Introduction to Converter Dynamics A. AC Model Construction 1. Actual Switch mode NonLinear System 2. Small AC Models by two Analytical Paths a. Circuit averaging over T s b. State space Averaging
More information3.1 ignored. (a) (b) (c)
Problems 57 [2] [3] [4] S. Modeling, Analysis, and Design of Switching Converters, Ph.D. thesis, California Institute of Technology, November 1976. G. WESTER and R. D. MIDDLEBROOK, LowFrequency Characterization
More informationPower Electronics in PV Systems
Introduction to Power Electronics in PV Systems EEN 2060 References: EEN4797/5797 Intro to Power Electronics ece.colorado.edu/~ecen5797 Textbook: R.W.Erickson, D.Maksimovic, Fundamentals of Power Electronics,
More informationChapter 10 Switching DC Power Supplies
Chapter 10 Switching One of the most important applications of power electronics 101 Linear Power Supplies Very poor efficiency and large weight and size 102 Switching DC Power Supply: Block Diagram
More informationLecture 7: MOSFET, IGBT, and Switching Loss
Lecture 7: MOSFET, IGBT, and Switching Loss ECE 481: Power Electronics Prof. Daniel Costinett Department of Electrical Engineering and Computer Science University of Tennessee Knoxville Fall 2013 Announcements
More informationLecture 7 ECEN 4517/5517
Lecture 7 ECEN 4517/5517 Experiments 45: inverter system Exp. 4: Stepup dcdc converter (cascaded boost converters) Analog PWM and feedback controller to regulate HVDC Exp. 5: DCAC inverter (Hbridge)
More informationIT is well known that the boost converter topology is highly
320 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 2, MARCH 2006 Analysis and Design of a LowStress BuckBoost Converter in UniversalInput PFC Applications Jingquan Chen, Member, IEEE, Dragan Maksimović,
More informationCHAPTER 3 MODIFIED FULL BRIDGE ZERO VOLTAGE SWITCHING DCDC CONVERTER
53 CHAPTER 3 MODIFIED FULL BRIDGE ZERO VOLTAGE SWITCHING DCDC CONVERTER 3.1 INTRODUCTION This chapter introduces the Full Bridge Zero Voltage Switching (FBZVSC) converter. Operation of the circuit is
More informationNeuro Fuzzy Control Single Stage Single Phase ACDC Converter for High Power factor
Neuro Fuzzy Control Single Stage Single Phase ACDC Converter for High Power factor S. Lakshmi Devi M.Tech(PE),Department of EEE, Prakasam Engineering College,Kandukur,A.P K. Sudheer Assoc. Professor,
More informationSwitched Mode Power Supply(SMPS) Circuit Design. Drive. Control. circuit. circuit. Converter. circuit. Fig. 1. Block diagram of a SMPS
The basic arrangement of a SMPS is shown in Fig. 1. Drive Control Rectifier Converter Fig. 1. Block diagram of a SMPS In this configuration, the power input is rectified and a switch at a high frequency
More informationOWING TO THE growing concern regarding harmonic
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 46, NO. 4, AUGUST 1999 749 Integrated HighQuality Rectifier Regulators Michael T. Madigan, Member, IEEE, Robert W. Erickson, Senior Member, IEEE, and
More informationPulseWidth Modulated DCDC Power Converters Second Edition
PulseWidth Modulated DCDC Power Converters Second Edition Marian K. Kazimierczuk PulseWidth Modulated DC DC Power Converters PulseWidth Modulated DC DC Power Converters Second Edition MARIAN K. KAZIMIERCZUK
More informationCHAPTER 5 The Parallel Resonant Converter
CHAPTER 5 The Parallel Resonant Converter T he objective of this chapter is to describe the operation of the parallel resonant converter in detail. The concepts developed in chapter 3 are used to derive
More informationINSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad
I INSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad000 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING TUTORIAL QUESTION BANK Course Name : POWER ELECTRONICS Course Code : AEE0
More informationExperiment DCDC converter
POWER ELECTRONIC LAB Experiment789 DCDC converter Power Electronics Lab Ali Shafique, Ijhar Khan, Dr. Syed Abdul Rahman Kashif 10/11/2015 This manual needs to be completed before the midterm examination.
More informationDHANALAKSHMI COLLEGE OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
DHANALAKSHMI COLLEGE OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING Power Diode EE2301 POWER ELECTRONICS UNIT I POWER SEMICONDUCTOR DEVICES PART A 1. What is meant by fast recovery
More informationCHAPTER 1 INTRODUCTION
CHAPTER 1 INTRODUCTION 1.1 Introduction Power semiconductor devices constitute the heart of the modern power electronics, and are being extensively used in power electronic converters in the form of a
More informationCHAPTER 6 ANALYSIS OF THREE PHASE HYBRID SCHEME WITH VIENNA RECTIFIER USING PV ARRAY AND WIND DRIVEN INDUCTION GENERATORS
73 CHAPTER 6 ANALYSIS OF THREE PHASE HYBRID SCHEME WITH VIENNA RECTIFIER USING PV ARRAY AND WIND DRIVEN INDUCTION GENERATORS 6.1 INTRODUCTION Hybrid distributed generators are gaining prominence over the
More informationEECS 473 Advanced Embedded Systems
EECS 473 Advanced Embedded Systems Lecture 15: Power review & Switching power supplies (again) A number of slides taken from UTAustin s EE462L power electronics class. http://users.ece.utexas.edu/~kwasinski/ee462ls14.html
More information6. Explain control characteristics of GTO, MCT, SITH with the help of waveforms and circuit diagrams.
POWER ELECTRONICS QUESTION BANK Unit 1: Introduction 1. Explain the control characteristics of SCR and GTO with circuit diagrams, and waveforms of control signal and output voltage. 2. Explain the different
More informationDevelopment of SMPS for Medium Voltage Electrical Drives
IJIRST International Journal for Innovative Research in Science & Technology Volume 3 Issue 07 December 2016 ISSN (online): 23496010 Development of SMPS for Medium Voltage Electrical Drives Modi Ankitkumar
More informationChapter 3 HARD SWITCHED PUSHPULL TOPOLOGY
35 Chapter 3 HARD SWITCHED PUSHPULL TOPOLOGY S.No. Name of the SubTitle Page No. 3.1 Introduction 36 3.2 Single Output Push Pull Converter 36 3.3 MultiOutput PushPull Converter 37 3.4 Closed Loop Simulation
More informationApplication Note, V1.1, Apr CoolMOS TM. ANCoolMOS08 SMPS Topologies Overview. Power Management & Supply. Never stop thinking.
Application Note, V1.1, Apr. 2002 CoolMOS TM ANCoolMOS08 Power Management & Supply Never stop thinking. Revision History: 200204 V1.1 Previous Version: V1.0 Page Subjects (major changes since last revision)
More informationDESIGN OF TAPPED INDUCTOR BASED BUCKBOOST CONVERTER FOR DC MOTOR
DESIGN OF TAPPED INDUCTOR BASED BUCKBOOST CONVERTER FOR DC MOTOR 1 Arun.K, 2 Lingeshwaran.J, 3 C.Yuvraj, 4 M.Sudhakaran 1,2 Department of EEE, GTEC, Vellore. 3 Assistant Professor/EEE, GTEC, Vellore.
More informationI. Erickson Problem 6.4 A DCM Two Transistor Flyback Converter
Lecture 15 The Forward PWM Converter Circuit Topology and Illustrative Examples 1 I Erickson Problem 64 A DCM Two Transistor Flyback Converter II Forward Converter A Overview B Forward Converter with a
More informationDesign and Simulation of Synchronous Buck Converter for Microprocessor Applications
Design and Simulation of Synchronous Buck Converter for Microprocessor Applications Lakshmi M Shankreppagol 1 1 Department of EEE, SDMCET,Dharwad, India Abstract: The power requirements for the microprocessor
More informationTABLE OF CONTENTS CHAPTER NO. TITLE PAGE NO. LIST OF TABLES LIST OF FIGURES LIST OF SYMBOLS AND ABBREVIATIONS
vii TABLE OF CONTENTS CHAPTER NO. TITLE PAGE NO. ABSTRACT LIST OF TABLES LIST OF FIGURES LIST OF SYMBOLS AND ABBREVIATIONS iii xii xiii xxi 1 INTRODUCTION 1 1.1 GENERAL 1 1.2 LITERATURE SURVEY 1 1.3 OBJECTIVES
More informationA Comparison of the Ladder and FullOrder Magnetic Models
A Comparison of the Ladder and FullOrder Magnetic Models Kusumal Changtong Robert W. Erickson Dragan Maksimovic Colorado Power Electronics Center University of Colorado Boulder, Colorado 83945 changton@ucsu.colorado.edu
More informationTSTE25 Power Electronics. Lecture 6 Tomas Jonsson ISY/EKS
TSTE25 Power Electronics Lecture 6 Tomas Jonsson ISY/EKS 20161115 2 Outline DC power supplies DCDC Converter Stepdown (buck) Stepup (boost) Other converter topologies (overview) Exercises 71, 72,
More informationBUCKBOOST CONVERTER:
BUCKBOOST CONVERTER: The buck boost converter is a type of DCDC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. Two different topologies
More informationGENERALLY, a singleinductor, singleswitch boost
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 19, NO. 1, JANUARY 2004 169 New TwoInductor Boost Converter With Auxiliary Transformer Yungtaek Jang, Senior Member, IEEE, Milan M. Jovanović, Fellow, IEEE
More informationAn Interleaved Flyback Inverter for Residential Photovoltaic Applications
An Interleaved Flyback Inverter for Residential Photovoltaic Applications Bunyamin Tamyurek and Bilgehan Kirimer ESKISEHIR OSMANGAZI UNIVERSITY Electrical and Electronics Engineering Department Eskisehir,
More information11. Define the term pinch off voltage of MOSFET. (May/June 2012)
Subject Code : EE6503 Branch : EEE Subject Name : Power Electronics Year/Sem. : III /V Unit  I PARTA 1. State the advantages of IGBT over MOSFET. (Nov/Dec 2008) 2. What is the function of snubber circuit?
More informationTHE classical solution of ac dc rectification using a fullwave
630 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 44, NO. 5, OCTOBER 1997 The Discontinuous Conduction Mode Sepic and Ćuk Power Factor Preregulators: Analysis and Design Domingos Sávio Lyrio Simonetti,
More informationA Photovoltaic Based Dual Output SEPIC Cuk Converter for Led Driver Applications
A Photovoltaic Based Dual Output SEPIC Cuk Converter for Led Driver Applications P.Kolanginathan Department of Electrical and Electronics Engineering, Anna University Regional Campus, Coimbatore, India.
More informationCHAPTER 2 A SERIES PARALLEL RESONANT CONVERTER WITH OPEN LOOP CONTROL
14 CHAPTER 2 A SERIES PARALLEL RESONANT CONVERTER WITH OPEN LOOP CONTROL 2.1 INTRODUCTION Power electronics devices have many advantages over the traditional power devices in many aspects such as converting
More informationPrinciple Of Stepup Chopper
Principle Of Stepup Chopper L + D + V Chopper C L O A D V O 1 Stepup chopper is used to obtain a load voltage higher than the input voltage V. The values of L and C are chosen depending upon the requirement
More informationGetting the Most From Your Portable DC/DC Converter: How To Maximize Output Current For Buck And Boost Circuits
Getting the Most From Your Portable DC/DC Converter: How To Maximize Output Current For Buck And Boost Circuits Upal Sengupta, Texas nstruments ABSTRACT Portable product design requires that power supply
More informationSINGLESTAGE HIGHPOWERFACTOR SELFOSCILLATING ELECTRONIC BALLAST FOR FLUORESCENT LAMPS WITH SOFT START
SINGLESTAGE HIGHPOWERFACTOR SELFOSCILLATING ELECTRONIC BALLAST FOR FLUORESCENT S WITH SOFT START Abstract: In this paper a new solution to implement and control a singlestage electronic ballast based
More information7.2 SEPIC BuckBoost Converters
BoostBuck Converter 131 5. The length of the trace from GATE output of the HV9930 to the GATE of the MOSFET should be as small as possible, with the source of the MOSFET and the GND of the HV9930 being
More informationPower Electronics (25) Please prepare your student ID card (with photo) on your desk for the attendance check.
Prof. Dr. Ing. Joachim Böcker Power Electronics 08.09.014 Surname: Student number: First name: Course of study: Task: (Points) 1 (5) (5) 3 (5) 4 (5) Total (100) Mark Duration: 10 minutes Permitted resources:
More informationHigh VoltageBoosting Converter with Improved Transfer Ratio
Electrical and Electronic Engineering 2017, 7(2): 2832 DOI: 10.5923/j.eee.20170702.04 High VoltageBoosting Converter with Improved Transfer Ratio Rahul V. A. *, Denita D Souza, Subramanya K. Department
More informationSimulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems
Simulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems Simulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems T.
More informationLinear Peak Current Mode Controlled Noninverting BuckBoost PowerFactorCorrection Converter
Linear Peak Current Mode Controlled Noninverting BuckBoost PowerFactorCorrection Converter Mr.S.Naganjaneyulu MTech Student Scholar Department of Electrical & Electronics Engineering, VRS&YRN College
More information2.4 Modeling and Analysis of Three Phase Four Leg Inverter
2.4 Modeling and Analysis of Three Phase Four Leg Inverter The main feature of a three phase inverter, with an additional neutral leg, is its ability to deal with load unbalance in a standalone power supply
More informationComparative Analysis of Power Factor Correction Techniques for AC/DC Converter at Various Loads
ISSN 239382 Vol., Issue 2, October 24 Comparative Analysis of Power Factor Correction Techniques for AC/DC Converter at Various Loads Nikita Kolte, N. B. Wagh 2 M.Tech.Research Scholar, PEPS, SDCOE, Wardha(M.S.),India
More informationImprovements of LLC Resonant Converter
Chapter 5 Improvements of LLC Resonant Converter From previous chapter, the characteristic and design of LLC resonant converter were discussed. In this chapter, two improvements for LLC resonant converter
More information