Overview of Wolfspeed Reference Designs and Eval...
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Transcript of Overview of Wolfspeed Reference Designs and Eval...
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Switching Efficiency Power Density
Silicon Carbide vs Silicon
SiC Si
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CLLC Resonant Tank
AC
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SiC Characteristics
• Smaller Size / Higher Density
• Smaller passive components
• Simpler / smaller Cooling
System Benefits
• 6.1kW On Board Charger (OBC) is 4x higher power density than existing 3.3kW
3.3kW Si OBC
6.1 kW SiC OBC
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Ref. M. Su, et al, WiPDA 2016Acknowledgment -- EE0006920 “88 Kilowatt Automotive Inverter with New 900 Volt Silicon Carbide MOSFET Technology”
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Enables 7-10% further range for same battery sizeOR
7-10% reduction in battery capability for same range
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Layouts
1200 V- -
100A 110A 140A
900 V - - 140A
650 V 100A - 140A
SiC MOSFETs Enable EV Drivetrains
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AC/DCFilter DC/AC AC/DCAC
Source
What : Fast charging from charge stations. 30 min charge durationBypasses OBC for rapid direct battery charging
Where : PHEV, BEV battery charging 80kW – 150kW. DC charge from station to car.Typically constructed from multiple 15-20kW blocks
Driving factors : Highest efficiency, Power density (smaller stations). Future trends bi-directional energy flow
SiC Advantage : >2% higher efficiency, 33% increase in power densitylower system cost
AC-DC Section DC-DC Section
SiC enables high efficiency high power density bi-directional 3 phase AC/DC converter
Si MOSFET
Q1
C1
C2
D5
D6
D1
D2 D4
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Q2
Q4Q3
Q6Q5
AC
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AC
V2
AC
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L1 L2 L3
Si IGBT
Simplify with SiC
• Less components• Lower cost• Higher efficiency• Smaller size• Bi-Directional power
SiC MOSFET C3M0065100K
TO-247-4 Package
12 Devices
20kW AC-DC power stage
Silicon solution SiC Solution
SiC MOSFET C3M0065100K
TO-247-4 Package
C3D20065DTO-247-3 Package
15kW Silicon hardware 20kW Silicon Carbide hardware• 33% more power in 33% less space• Simplify circuit design• Lower cost• Increase Efficiency• Reduce size
Simplify with SiC
4 devices
8 devices
Silicon Wolfspeed SiC
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900V rated voltage
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The Market Situation- Monumental 20 year + new open field opportunity for power- SiC value is very well understood and accepted- Multiple approaches to system solution – especially drivetrain- All OEM’s seeking differentiation & Differing regional approaches
Driving Factors- Increased Power density- Higher system efficiency- Range extension- Lower System cost
Supplier Imperatives- Proven reliability- Enough capacity- Product flexibility- Technology innovation to satisfy future developments - Component differentiation to allow system differentiation
A Samples and B samples are being developed NOW
The future is electric – and it starts with Wolfspeed
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