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Electronic Components and Technology Conference
Packaging Challenges and Solutions for Silicon Carbide Power
Electronics
Ljubisa Stevanovic, Ph.D. Chief Engineer and Advanced Technology
Leader, GE Global Research, Niskayuna, NY [email protected] Presented
at: ECTC Panel Session: Power Electronics – A Booming Market, San
Diego, 29 May, 2012
https://www.ectc.net/index.cfmhttps://www.ectc.net/index.cfmmailto:[email protected]
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L. Stevanovic, Power Electronics – A Booming Market, 2
Semiconductor Materials for Power Electronic Devices
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L. Stevanovic, Power Electronics – A Booming Market, 3
SiC Enables New Product Capabilities
GE SiC MOSFET
1/2 Space & weight, or
2x
50oC
Reliability
Higher temperature capability
Generation
Conversion
Distribution
Power Density 2x Air
Land Marine
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L. Stevanovic, Power Electronics – A Booming Market, 4
Limitations of Standard Power Module
• Electrical limitations • Current sharing • Package inductance
too high • Wirebond current handling
• Thermal limitations • Baseplate-to-heatsink thermal
resistance • Low power density (including
heatsink)
• SiC module power limitations • Yield and cost challenges
associated with wirebonding many small SiC devices
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L. Stevanovic, Power Electronics – A Booming Market, 5
• Minimize voltage overshoot / derating
• Reduce switching losses, or increase frequency
• Minimize snubber requirements
OFF
loopst
ILV
Importance of Low Inductance
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L. Stevanovic, Power Electronics – A Booming Market, 6
Adhesive
Die Die
Polyimide Copper
Die Metallization
2000 µm
Wirebond Structure
Low & matched parasitics - Low Inductance, Low Resistance;
High current capability : Power Efficiency
Reducing size and weight while maintaining performance: System
Cost
Eliminate wire-bonds and solder-bumps: Power Efficiency &
Performance
Ability to array multiple die: System Cost
2
3
4
1
1
2
3
4
Power OverLay (POL) Interconnect PWB-like planar interconnect
for power packaging
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L. Stevanovic, Power Electronics – A Booming Market, 7
• Thick copper connections • Litho defined layout • Laser
drilled vias • Frame based • Flexible film
~200 µm
Top-side view Underside
Copper
Die
Solder
Polyimide
Adhesive
Via
POL via cross-section
PWB-like Manufacturing Processes
POL vias
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L. Stevanovic, Power Electronics – A Booming Market, 8
Performance Differentiation
Wirebond POL Flip-Chip
Resistance
Inductance
Manuf Costs
HF characteristics
System Cost
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L. Stevanovic, Power Electronics – A Booming Market, 9
SiC Power Module –Switching Test 11ns inductive switching at:
VDS = 540V, ID = 300A
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L. Stevanovic, Power Electronics – A Booming Market, 10
VIN = +/-270VDC, VOUT = 220VLN, POUT = 75kW, FFUND_MAX
=1.8kHz
Motor
Comp-ressor +/- 270VDC
+
-
3
Liquid Cooling
Aircraft Cabin
Environmental Control System (ECS)
3
3
Starter
GE SiC MOSFET Modules
75kW SiC Inverter Dual function: engine starter + ECS compressor
drive
Air Land
Marine
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L. Stevanovic, Power Electronics – A Booming Market, 11
SiC MEA Inverter - Efficiency Results
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L. Stevanovic, Power Electronics – A Booming Market, 12
Summary: GE SiC Development Realizing the full benefit of SiC
power electronics
