Opportunities and Design Considerations of GaN HEMTs in...
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Juncheng (Lucas) Lu, Ruoyu Hou, and Di ChenGaN Systems Inc.
Paper Number :1213
Opportunities and Design Considerations of GaN HEMTs
in ZVS Applications
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Content
1. Introduction
2. Loss Model of GaN HEMTs in ZVS Applications
3. Package Considerations
4. Conclusions
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GaN HEMTs today
Consumer
Datacenter
Industrial
Transportation
Shipping since 2014• Offices in 7 countries• Worldwide disti & direct sales
#1 in GaN• Highest current; broadest voltages• Best electrical performance• Best die & best package• Most widely used by customers
Customer successesSolar Inverter and ESS•Motor Drives•Wireless Power and Charging•AC Adapters•Datacenter Server • and Rack PowerAutomotive Onboard Charger•
High-power
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PowerSupply
Opportunities with GaN E-HEMTs
Efficiency
Power Density
Lower Figure of MeritZero Reverse Recovery
Heatsink Size ReductionSmaller packaging of Device
Passive Component Size ReductionFilter Size ReductionFewer windingsLower ΔBPower
Supply
Power Supply
Replace Si with GaN
Increase Switching Frequency
GaN-enabled topologies and
algorithms
Improvement happening in supporting technologies
Packaging •Magnetic Materials•Gate drivers • …
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Loss Model of GaN HEMTs in ZVS Applications
Half-bridge overall loss vs. switching current under different negative turn-off gate voltage VDRoff (a) with deadtime tD=40 nS, (b) with deadtime tD=100 nS, (c) with deadtime tD=200 nS.
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Parasitics Optimization is the key to the ultra-high performance of GaN HEMT.[1] J. L. Lu and D. Chen, "Paralleling GaN E-HEMTs in 10kW–100kW systems," 2017 IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017, pp. 3049-3056. doi: 10.1109/APEC.2017.7931131
Key Parasitics for Paralleling [1]
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GaNPX has ultra-low Ls compared to traditional package.
GaNPX T PackageGS66516T (650V/25mΩ)
Top side Bottom side
Package Source inductance Ls=0.05nH
Ansys Q3D 3D modeling of GS66516T TO-247 Package inductance
G DS
LQS = ~ 5~9 nHSS
Packaging Parasitics of Power Semi-conductors
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Reference Design of 240A/650V GaN Module
Gate driver board
Metal Core PCB
More compact layout and lower stray inductance than traditional power module, optimized for high speed GaNThermal resistance RthJC ~= 1̊C/W
Gate driver board design conceptAssemble on top of IMS(metal core) boards
Decoupling capsSi8271 Isolated Gate drivers
60A / 650V GaN HEMT
The thermal performance is enhanced compared with the PCB solution.
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Reference Design of 240A/650V GaN Module
The thermal performance is enhanced compared with the PCB solution.
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Experimental Results
S1
S2
S3
S4
CBUS VDCL1
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Thank you!&
Any questions?