high efficiency power converters using gallium nitride transistors marl nakmali mentors: dr. leon...
TRANSCRIPT
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High Efficiency Power Converters Using Gallium Nitride Transistors
Marl NakmaliMentors:
Dr. Leon TolbertYutian Cui
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Room for Improvement
5-2
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Material Properties and Limitations
5-3
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Size Minimization
5-4
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Data Sheet Comparison
5-5
Gallium Nitride Silicon
VDS [V] 30 30
RDS(on) [Ω] 0.001 1.3
ID [A] 60 42
VGS [V] -4<VGS<6 -20<VGS<20
Size [mm2] 13.915 30
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But what about the price?
5-6
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How it works
5-7
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The Buck Converter
5-8
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The Buck Converter
5-9
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The Buck Converter
5-10
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Loss Analysis
5-11
These losses are:• Switching Loss• Conduction Loss
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Results
5-12
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Efficiency Graphs
5-13
11.995 23.977 36.0380
0.10.20.30.40.50.60.70.80.9
1
3V Input Performance
Output Power [W]
Effi
cie
ncy
GaN: Silicon:
200kHz600kHz1MHz
200kHz600kHz1MHz
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Efficiency Graphs
5-14
11.996 23.992 35.9810
0.10.20.30.40.50.60.70.80.9
1
4V Input Performance
Output Power [W]
Effi
cie
ncy
GaN: Silicon:
200kHz600kHz1MHz
200kHz600kHz1MHz
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Efficiency Graphs
5-15
11.991 24.006 35.9770
0.10.20.30.40.50.60.70.80.9
1
5V Input Performance
Output Power [W]
Effi
cie
ncy
GaN: Silicon:
200kHz600kHz1MHz
200kHz600kHz1MHz
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Efficiency Graphs
5-16
11.996 23.994 35.9880
0.10.20.30.40.50.60.70.80.9
1
6V Input Performance
Output Power [W]
Effi
cie
ncy
GaN: Silicon:
200kHz600kHz1MHz
200kHz600kHz1MHz
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Silicon Switching Period
5-17
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GaN Switching Period
5-18
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GaN Physical Switching Period
5-19
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Conclusion
5-20
Gallium Nitride has:• Desirable material
properties in a transistor.• High frequency, allowing
smaller circuits.• Development into
becoming cheaper.
Applications:• Smaller, more efficient
power converters.• Faster, more reliable
data transfer.
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Acknowledgements
This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award Number EEC-1041877.
Other US government and industrial sponsors of CURENT research are also gratefully acknowledged.
21
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Questions and Answers
22
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5-23
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Power Converters
A power converter converts electrical energy from:• AC to AC• AC to DC• DC to AC• DC to DC
Types of DC to DC converters:• Step Down (Buck) Converters• Step Up (Boost) Converters
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Result Analysis
• Put in efficiency of simulation versus efficiency of measured values
• Compare these efficiencies with data from Silicon OptiMOS directFET
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What is existing technology?
Silicon MOSFETs• Currently the industry is
mostly reliant on Silicon MOSFETs
• It has a cheap price• Its manufacturing processes
are matured• It is already in enhancement
mode, which is easier and safer
GaN MOSFETs• GaN MOSFETs are not as
cheap• Its manufacturing processes
are not yet mature• It is not inherently in
enhancement mode and steps must be taken for it to be in that mode
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Switching Loss
5-27
• How do we make it smaller? We could make the die area small which will decrease the
capacitance which in turn decreases the tsw but this will raise the Rdson
Change the material and we can minimize both
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Conduction Loss
5-28
• How do we make it smaller? We could increase its area to lower the resistance, but it will
increase the capacitance of the device, causing longer transient time, and larger passive components
We could change to a more conductive material
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Gate Loss
5-29
• How do we make it smaller? By making a smaller die, the body capacitance is much smaller
so less charge is needed and smaller voltages can drive the gate
We can use a different material