3kw power supply design with easy 1 2… · 2020-02-24 · 3kw power supply design with easy...
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3kW Power Supply Design with Easy
Manufacturability for 48 V Bus Power Architecture Ahmed Nabih, Qiang Li and Fred C. Lee
Center for Power Electronics Systems (CPES)Virginia Polytechnic Institute and State University
48 V Power Architecture
Why 48 V power architecture ?
• Less dissipation Loss from power supply to Load
• No UPS or battery charger needed
Ecosystem for Datacenter and Telecom
• More Efficient than 12V architecture
• More power per server rack
400V/48V 3kW DC-DC
Half Bridge LLC
Limited power (<1kW)
Mature topology Easy to design and control
Three Phase Interleaved LLCParallel phasesHandle more power
Complex magnetic structure
Full-bridge LLC with Matrix transformer
CPES Solution
Easier Manufacturability
Litz Wire Magnetics
100kHz
PCB Magnetics
1MHz
Challenge: Low frequency design with Litz wire magnetics(more labor more cost)
Hardware Demonstration
Solution #1
Solution #2
• Utilize Transformer leakage as resonant inductor
• Smaller footprint and high power density solution cSR
cSR CSR
CSR
CSRc SR
SR cC SR
1 2
43
Layer 2 (Primary)
Layer 4 (Secondary )
1 2
43
1 2
43
c SR
C SR
Layer 3 (Primary)
55
5 5
1 2
43
Flux distribution in core
Proposed 5-Leg core
Leakage in center Leg
Efficiency 97.4%Power Density 400W/in3
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0 1000 2000 3000
Effi
cie
ncy
%
Power