what are the “big challenges” in power electronics?...7/89 dc-ac converter d. bortis d. boillat...
TRANSCRIPT
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Acknowledgement
Florian Krismer Hans-Peter Nee
What are the “Big CHALLENGES” in Power Electronics?
Johann W. Kolar
Swiss Federal Institute of Technology (ETH) Zurich Power Electronic Systems Laboratory www.pes.ee.ethz.ch
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Acknowledgement
Florian Krismer Hans-Peter Nee
What are the “Big OPPORTUNITIES” in Power Electronics?
Johann W. Kolar
Swiss Federal Institute of Technology (ETH) Zurich Power Electronic Systems Laboratory www.pes.ee.ethz.ch
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Power Electronics 2.0
Acknowledgement
Florian Krismer Hans-Peter Nee
Johann W. Kolar
Swiss Federal Institute of Technology (ETH) Zurich Power Electronic Systems Laboratory
www.pes.ee.ethz.ch
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ETH Zurich D-ITET / PES
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Departments of ETH Zurich
ARCH Architecture BAUG Civil, Environmental and Geomatics Eng. BIOL Biology BSSE Biosystems CHAB Chemistry and Applied Biosciences ERDW Earth Sciences GESS Humanities, Social and Political Sciences HEST Health Sciences, Technology INFK Computer Science ITET Information Technology and Electrical Eng. MATH Mathematics MATL Materials Science MAVT Mechanical and Process Engineering MTEC Management, Technology and Economy PHYS Physics USYS Environmental Systems Sciences
Students ETH in total
13‟500 B.Sc.+M.Sc.-Students 3‟500 Doctoral Students
21 Nobel Prizes 413 Professors 6240 T &R Staff
2 Campuses 136 Labs 35% Int. Students 90 Nationalities 36 Languages
150th Anniv. in 2005
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Balance of Fundamental and Application Oriented Research
Power Semiconductors
Power Systems
Advanced Mechatronic
Systems
High Voltage Technology
Power Electronic Systems
High Power Electronics
► EEnergy Research Cluster @ D-ITET
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DC-AC Converter
D. Bortis
R. Burkart
Power Electronic Systems Laboratory
Johann W. Kolar
AC-DC Converter
M. Leibl
D. Neumayr D. Rothmund
L. Schrittwieser
DC-DC Converter
P. Bezerra M. Kasper
Industry Relations R. Coccia / B. Seiler
AC-AC Converter
D. Boillat Ch. Gammeter
Th. Guillod J. Huber
H. Uemura
Multi-Domain Modeling
Advanced Mechatronics
M. Flankl M. Mauerer
M. Kaufmann
Th. Nussbaumer
Th. Holenstein D. Steinert M. Schuck
T. Wellerdieck
Secretariat M. Kohn / D. Egger
Administration P. Albrecht / P. Maurantonio
Computer Systems C. Stucki
Electronics Laboratory P. Seitz
R. Bosshard O. Knecht
22 Ph.D. Students 3 Post Docs
► Power Electronic / Mechatronic Systems
Leading Univ. in Europe
F. Krismer
Magnetic Levitation
Wireless Power
A. Tüysüz
C. Dittli
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Power Electronics
Cross-Departmental
Mechanical Eng., e.g. Turbomachinery, Robotics
Microsystems Medical Systems
Economics / Society
Research Scope
• Micro-Scale Energy Systems • Wearable Power • Exoskeletons / Artificial Muscles • Environmental Systems • Pulsed Power
►
Actuators / EL. Machines
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Industry Collaboration
• Renewable Energy • UPS • Smart Grid • Automotive Systems • More-Electric Aircraft • Medical Systems • Industry Automation • Semiconductor Process Technology • Etc.
■ 16 International Research Partners
■ Core Application Areas
Research Budget
2/3 Industry Share
Strategic Research
Research Collaborations
►
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Research Approach
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Mapping of Design Space into System Performance Space
► Abstraction of Converter Design
Performance Space
Design Space
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► Mathematical Modeling and Optimization of Converter Design
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Sensitivity to Technology Advancements Trade-off Analysis
► Technology Sensitivity Analysis Based on η-ρ-Pareto Front
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Examples of Research Results in
Power Electronics
■ Ultra-Compact Systems ■ Ultra-Efficient Systems
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10kW/dm3 Power Density
fP= 250kHz
► 3-Ф Boost-Type PFC Rectifier
PO= 10 kW UN= 230VAC±10% fN= 50Hz or 360…800Hz UO= 800VDC
► Si CoolMOS ► SiC Diodes
η = 96.2% @ PO THDI = 1.6% @ PO γ = 3kW/kg
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fP= 250kHz
► 3-Ф Boost-Type PFC Rectifier
PO= 10 kW UN= 230VAC±10% fN= 50Hz or 360…800Hz UO= 800VDC
► Si CoolMOS ► SiC Diodes
η = 96.2% @ PO THDI = 1.6% @ PO γ = 3kW/kg
10kW/dm3 Power Density
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► Mains Behavior @ 400 Hz/800 Hz
10A/Div
200V/Div 0.5ms/Div
PO = 10kW UN = 230V fN = 400Hz UO = 800V THDi = 1.4%
10A/Div
200V/Div 1ms/Div
PO = 10kW UN = 230V fN = 800Hz UO = 800V THDi = 1.6%
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► Solid-State Transformer 20kHz DC-DC Converter Cell ● Half-Cycle DCM Series Resonant DC-DC Converter ● Rated Power 166kW ● Medium-Voltage Side 2kV ● Low-Voltage Side 400V
80kW Operation
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► Water-Cooled 20kHz Transformer
● Power Rating 166 kW ● Efficiency 99.5% ● Power Density 32 kW/dm3
- Nanocrystalline Cores with 0.1mm Airgaps between Parallel Cores for Equal Flux Partitioning
- Litz Wire (10 Bundles) with CM Chokes for Equal Current Partitioning
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► Wireless Power Transfer - Characteristics 50kW 800V / 85kHz 41x76x6 cm 24.6 kg η DC/DC = 96.5 %
■ All-SiC Converter System ■ Efficiency Optimal Load Matching Control ■ Application in Public Transportation / Industrial Environments etc.
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Examples of Research Activities in
Mechatronics
■ Ultra High Speed Drives ■ Bearingless Machines
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World Record !
100W @ 1„000„000 rpm
• μm-Scale PCB Drilling • Dental Technology • Laser Measurement Technology • Turbo-Compressor Systems • Air-to-Power • Artificial Muscles • Mega Gravity Science
1 cm
► Ultra High Speed Drive Systems
► ►
► ►
► ► ►
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World Record !
500„000 rpm
• Laser Measurement Technology Active Damping of Air Bearings • Satellite Attitude Control
► Ultra High Speed Magnetically Levitated Drive Systems
► ► ►
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► Bearingless Motors
● Maximum Speed 2000rpm ● High Acceleration Capability (3.8s from 0 → 2000rpm) ● 7mm Air Gap ● Two Phase Winding Configurations ● Adaptive Unbalance Compensation Control
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► Application Areas & Performance Trends ► Component Technologies Challenges ► Topologies & Modulation/ Control Challenges ► Design & Testing Procedure Challenges ► Future CHALLENGES Opportunities (!) ► Future Univ. Research & Education ► Conclusions
Outline
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Application Areas Performance Trends
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► Application Areas
■ Industry Automation / Processes ■ Communication & Information ■ Transportation ■ Lighting ■ etc., etc. …. Everywhere !
Source:
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► Power Electronics Converters Performance Trends
─ Power Density [kW/dm3] ─ Power per Unit Weight [kW/kg] ─ Relative Costs [kW/$] ─ Relative Losses [%] ─ Failure Rate [h-1]
■ Performance Indices
[kgFe /kW] [kgCu /kW] [kgAl /kW] [cm2
Si /kW]
►
►
Environmental Impact…
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► Performance Improvements (1)
─ Telecom Power Supply Modules: Typ. Factor 2 over 10 Years
■ Power Density
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► Performance Improvements (2)
Inefficiency (Losses)…
■ Efficiency
─ PV Inverters: Typ. Loss Reduction of Factor 2 over 5 (10) Years
98%
90%
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Source: 2006
■ Costs
─ Importance of Economy of Scale
► Performance Improvements (3)
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► Challenge
■ How to Continue the Dynamic Performance Improvement (?)
─ Components ─ Topologies ─ Modulation & Control ─ Design Procedure ─ Modularization / Standardization / Economy of Scale ─ Manufacturing ─ New Applications
■ Degrees of Freedom
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Components Potentials & Limits
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Power Semiconductors
Si / SiC / GaN
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Source: Dr. Miller / Infineon / CIPS 2010
■ Past Disruptive Changes ─ IGBT Trench & Field-Stop ─ MOSFET Superjunction Technology
600V Devices
► Si Power Semiconductors
Factor >10
-60%
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► WBG Power Semiconductors Source: Dr. Miller Infineon CIPS 2010
■ Disruptive Change ─ Extremely Low RDS(on) ─ Very High Tj,max ─ Extreme Sw. Speed
■ Utilization of Excellent Properties Main Challenges in Packaging (!)
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► WBG Power Semiconductors
■ Disruptive Change ─ Extremely Low RDS(on) ─ Very High Tj,max ─ Extreme Sw. Speed
■ Utilization of Excellent Properties Main Challenges in Packaging (!)
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► SKiN Technology ■ No Bond Wires, No Solder, No Thermal Paste ■ Ag Sinter Joints for all Interconnections of a Power Module (incl. Heatsink) ■ Extremely Low Inductance & Excellent Thermal Cycling Reliability
Source: Dr. Scheuermann Dr. Beckedahl CIPS 2008
■ Allows Extension to 2-Side Cooling (Two-Layer Flex-Foil) ■ Allows Integration of Passive & Active Comp. (Gate Drive, Curr. & Temp. Measurem.) ■ Disruptive Improvement (!)
SKiN 600V/400 A
Half-Bridge Module
►
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► Multi-Functional PCB
■ Multiple Signal and High Current Layers ■ Integrated Thermal Management
Via
Upper and Lower Signal Layers
Aluminium High Current Track
Copper as High Current Track
Aluminium Heatsink
Aluminium Heat Extraction
Path
■ Substantial Change of Manufact. Process “Fab-Less” Power Electronics ■ Advanced Simul. Tools of Main Importance (Coupling with Measurem.) ■ Testing is Challenging (Only Voltage Measurement) ■ Once Fully Utilized – Disruptive Change (!)
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► 3ph. Inverter in p2pack-Technology
• Rated Power 32kVA • Input Voltage 700VDC • Output Frequency 0 … 800Hz • Switching Frequency 20kHz Source:
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– Power Semiconductor PCB Integration
Current Measurement
Auxiliary Supply
Voltage Measurement
Gate Driver
Protection Circuit
Powerlink Encoder Interface
DSP
USB CAN
• Rated Power 32kVA • Input Voltage 700VDC • Output Frequency 0 … 800Hz • Switching Frequency 20kHz
Source:
► 3ph. Inverter in p2pack-Technology
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► Latest Systems Using WBG Devices GaN
■ GaN 3x3 Matrix Converter Chipset with Drive-By-Microwave (DBM) Technology
– 9 Dual-Gate Normally-Off Gate-Injection Bidirectional Switches – DBM Gate Drive Transmitter Chip & Isolating Dividing Couplers – Extremely Small Overall Footprint - 25 x 18 mm2 (600V, 10A – 5kW Motor)
Source: ISSCC 2014
5.0GHz Isolated (5kVDC) Dividing Coupler
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Σ Power Semiconductors Gate Drive Packaging
■ Disruptive Changes Happened – WBG, LTJT ■ Cont. Further Improvements – Packaging, Reliability (!) Main Challenges to Manufacturers Main Challenges to General Users
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Passive Components
Capacitors / Magnetics / Cooling
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OPP = Oriented Polypropylene PHD = Advanced OPP COC = Cycloolefine Copolymers
Source:
─ Foil Capacitors Energy Density
Film Material
Max. Temperature
Self Inductance
► Capacitors
■ Relatively (Slow) Technology Progress ■ Recently Significant Improvement (incl. Packaging) – e.g. CeraLink
Source: Dr. Plikat et al. Volkswagen AG PCIM 2013
Automotive Capacitors for 450V, normalized to 500 μF
Year
Vo
lum
e /
l
Film Thickness Volume for 500μF
Year
Vo
lum
e /
l
Film
Th
ickn
ess
/ μ
m
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► Power Chip Capacitors
■ Targeting Automotive Applications up to 90kW ■ High Voltage Ratings / High Current Densities (>2A/μF) ■ Low Volume / High Volume Utilization Factor ■ Low Ind. Busbar Connection / Low Switching Overshoot
Source:
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► Magnetics
■ Example: Scaling Law of Transformers
There is No “Moore's Law” in Power Electronics !
Bmax … Relatively Slow Technology Progress Jrms … Limited by Conductivity – No Change f … Limited by HF Losses & Converter
& General Thermal Limit
ˆ
We have to Hope for Progress in Material Science
■ No Fundamentally New Concepts
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■ Example: Scaling Law of Transformers
There is No “Moore's Law” in Power Electronics !
■ No Fundamentally New Concepts
► Magnetics
We have to Hope for Progress in Material Science (Magnetic, Thermal – Could take > 10Years)
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► Operation Frequency Limit ■ Relationship of Volume and Weight vs. Frequency
─ Higher Frequency Results in Smaller Transformer Size only Up to Certain Limit ─ Opt. Frequencies for Min. Weight and Min. Volume (!)
■ 100Vx1A 1.1 Transformers, 3F3, 30°C Temp. Rise
Source: Philips
►
►
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► Influence of Magnetics on System Costs
■ Example of 20kVA UPS System (Single-Stage Output Filter)
■ 44% of Main Power Stage Costs (!)
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Σ Magnetics Capacitors
■ Large Volume Share / Cost Factor ■ Only Gradual Improvements Magnetics ■ Careful Design Absolutely Mandatory (!) ■ Hope for Adv. Power Transformer/ Inductor Materials ■ Improved Heat Management Capacitors ■ High Frequ. Operation for Minim. Vol. (e.g. DC Link) ■ Replace Storage Capacitors by Active Circuits ■ Hope for Adv. Dielectrics
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Converter Topologies
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1944 !
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98% Efficiency 29kW/dm3
─ Example: Non-Isolated Buck+Boost DC-DC Converter for Automotive Applications
► Auxiliary Circuits
■ Instead of Adding Aux. Circuits Change Operation of BASIC (!) Structures - “Natural” Performance Limit
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► Integration of Functions ─ Examples: * Single-Stage Approaches / Matrix Converters * Multi-Functional Utilization (Machine as Inductor of DC/DC Conv.) * etc.
■ Integration typ. Restricts Controllability / Overall Functionality (!) ■ Typ. Lower Performance / Higher Control Compl. of Integr. Solution ■ Basic Physical Properties remain Unchanged (e.g. Filtering Effort)
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■ Highly Optimized Specific Functionality High Performance for Specific Task ■ Restriction of Functionality Lower Costs
■ Example of Wide Input Voltage Range Isolated DC/DC Converter
► Extreme Restriction of Functionality
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New Topologies Σ
Some Exceptions
■ Multi-Cell Converters ■ 3-ph. AC/DC Buck Converter ■ etc.
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Multi-Cell Converters Ultra-Efficient 1ph. PFC
1ph. Telecom PFC Rectifier
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► Bidirectional Ultra-Efficient 1-Ф PFC Mains Interface
99.36% @ 1.2kW/dm3
■ Employs NO SiC Power Semiconductors -- Si SJ MOSFETs only
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■ Zero Voltage Switching – Triangular Current Mode
■ Synchronous Rectification ■ Negative Current Ensures ZVS
►
► Bidirectional Ultra-Efficient 1-Ф PFC Mains Interface
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99.36% @ 1.2kW/dm3
■ Employs NO SiC Power Semiconductors -- Si SJ MOSFETs only
► Bidirectional Ultra-Efficient 1-Ф PFC Mains Interface
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97.0
97.2
97.4
97.6
97.8
98.0
98.2
98.4
98.6
98.8
99.0
1000 1500 2000 2500 3000 3500
P O /W
h/%
264V
230V
184V
Limit
98.6% @ 4.5kW/dm3
► 1-Ф Telecom Boost-Type TCM PFC Rectifier
• Input Voltage 1-ph. 184…264VAC • Output Voltage 420VDC • Rated Power 3.3kW
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Efficiency Power Density
► Observation
■ Very Limited Room for Further Performance Improvement !
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Topologies Modulation Schemes Control Schemes Σ
Topologies ■ Basic Concepts Extremely Well Known - Mature ■ Comprehensive Comparative Evaluations Missing (!) ■ Promising Multi-Cell Concepts (!) Modulation / Control Schemes ■ Basic Concepts Extremely Well Known - Mature ■ Modified Concepts for Basic Converter Structures (!) ■ Digital Power – All Diff. Kinds of Functions (!)
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Advanced Design
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► Design Challenge
■ Mutual Couplings of Performance Indices Trade-Offs
─ For Optimized System Several Performance Indices Cannot be Improved Simultaneously
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► Design Challenge
■ Mutual Couplings of Performance Indices Trade-Offs
─ For Optimized System Several Performance Indices Cannot be Improved Simultaneously
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Multi-Domain Modeling /
Simulation/ Optimization
Hardware Prototyping
20%
80%
2010
2020
80%
20%
► Future Design Process
■ Challenge: Virtual Prototyping
■ Reduces Time-to-Market ■ More Application Specific Solutions (PCB, Power Module, and even Chips) ■ Only Way to Understand Mutual Dependencies of Performances / Sensitivities (!) ■ Simulate What Cannot Any More be Measured (High Integration Level)
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Virtual Prototyping Σ Remaining Challenges
■ Comprehensive Modeling (e.g. EMI, Reliability) ■ Model Order Reduction … will Take a “Few” More Years
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“New Challenges”
“Power Electronics 1.0”
Maturing Reduce Costs, Ensure Reliability (!)
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■ If Only Incremental Improvements of Converters Can Be Expected
■ “Converter” “Systems” (Microgrid) or “Hybrid Systems” (Autom. / Aircraft) ■ “Time” “Integral over Time” ■ “Power” “Energy”
Shift to New Paradigm
! ► Consider Converters like “Integrated Circuits”
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─ Power Conversion Energy Management / Distribution ─ Converter Analysis System Analysis (incl. Interactions Conv. / Conv. or Load or Mains) ─ Converter Stability System Stability (Autonom. Cntrl of Distributed Converters) ─ Cap. Filtering Energy Storage & Demand Side Management ─ Costs / Efficiency Life Cycle Costs / Mission Efficiency / Supply Chain Efficiency ─ etc.
■ If Only Incremental Improvements of Converters Can Be Expected …
► Consider Converters like “Integrated Circuits”
Shift to New Paradigm
!
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► AC vs. Facility-Level DC Systems for Datacenters
■ Reduces Losses & Footprint ■ Improves Reliability & Power Quality
─ Conventional US 480VAC Distribution
■ Proposal for Public +380VDC/-380VDC Systems by Philips, , etc.
─ Facility-Level 400 VDC Distribution
Source: 2007
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6.600 VAC 48 VDC
■ Future Concept: Direct 6.6kV AC 48 V DC Conversion / Unidirectional SST w. Integr. Storage
─ Direct / Individual Supply of Racks
► SST-Based Rack-Level 48V DC Power Supply System
■ Reduces Costs (Losses / Material Effort / Footprint) ■ High Reliability (Maximum Modularity / Redundancy)
– Distributed Battery Buffer on Rack Level
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► Power Electronics Systems Performance Figures/Trends
─ Power Density [kW/m2] ─ Environm. Impact [kWs/kW] ─ TCO [$/kW] ─ Mission Efficiency [%] ─ Failure Rate [h-1]
■ Complete Set of New Performance Indices
►
►
Supply Chain &
►
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System-Oriented Analysis Σ Main Challenges
■ Get to Know the Details of Power Systems ■ Theory of Stability of Converter Clusters ■ Autonomous Control
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Remarks on University Research
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► University Research Orientation
─ Gap between Univ. Research and Industry Needs ─ In Some Areas Industry Is Leading the Field
■ General Observations
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■ Gap between Univ. Research and Industry Needs
─ Industry Priorities 1. Costs 2. Costs 3. Costs - Multiple Objectives ... - Low Complexity - Modularity / Scalability - Robustness - Ease of Integration into System
─ Basic Discrepancy ! Most Important Industry Variable, but Unknown Quantity to Universities
► University Research Orientation
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■ In Some Areas Industry Is Leading the Field !
─ Industry Low-Power Power Electronics (below 1kW) Heavily Integrated – PCB Based Demonstrators Do Not Provide Too Much Information (!) Future: “Fab-Less” Research
─ Same Situation above 100kW (Costs, Mech. Efforts, Safety Issues with Testing etc.) ─ Talk AND Build Megawatt Converters (!)
► University Research Orientation
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Power Electronics 2.0
Finally, …
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Advanced Packaging (!) Moore's Law
■ WBG Semiconductor Technology Higher Efficiency, Lower Complexity ■ Microelectronics More Computing Power
+
… besides CO2 Reduction / Ren. Energy Integration etc.
► Enablers (1)
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■ Metcalfe's Law
– Moving form Hub-Based Concept to Community Concept Increases Potential Network Value Exponentially (~n(n-1) or ~n log(n) )
► Enablers (2)
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Power MOSFETs/IGBTs Microelectronics
Circuit Topologies Modulation Concepts
Control Concepts
Super-Junct. Techn. / WBG Digital Power
Modeling & Simulation
2025 2010
► ►
► ►
SCRs / Diodes Solid-State Devices
► Power Electronics Technology S-Curve
Paradigm Shift
…after Switches and Topologies
Packaging Magnetics
Advanced Design “Systems”
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► Future Extensions of Power Electronics Applications
Source: AIST
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► Future Extensions of Power Electronics Applications
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New Application Areas - Smart XXX (Integration of Energy/Power & ICT) - Micro-Power Electronics (VHF, Link to Microelectronics) - MEGA-Power Electronics (MV, MF) Paradigm Shift - From “Converters” to “Systems” - From “Inner Function” to “Interaction” Analysis - From “Power” to “Energy” (incl. Economical Aspects) Enablers / Topics - New (WBG) Power Semiconductors (and Drivers) - Adv. Digital Signal Processing (on all Levels – Switch to System) - PEBBs / Cells & Automated (+ Application Specific) Manufaturing - Multi-Cell Power Conversion - Multi-Domain Modeling / Multi-Objective Optim. / CAD - Cybersecurity Strategies
Power Electronics 2.0
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Thank You !
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Questions ?