SOPO Task BP2421 Member Organization NC State University Key Team Members David Ricketts Project Start Date June 1 2016 Budget Period and Quarter of Review BP2Q4 April June 2017 ID: 790901
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Task Title: GaN RF DC-DC Converter DesignSOPO Task # BP2-4.21Member Organization: NC State University
Key Team Members: David RickettsProject Start Date: June 1, 2016Budget Period and Quarter of Review: BP2-Q4 (April – June 2017)
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Slide2Project OverviewBrief Description:Using integrated GaN, a high-speed DC-DC converter that can be realized to replace linear amplification currently used in telecom base-stations, which currently use 60 TWh/a. Power is dominated by linear power amplification.
Slide3Project OverviewFit to Mission: In telecom application high-power, low efficiency (<40%) base-stations are the dominant energy consumer. This task seeks to reduce this energy consumption through the development of a high-speed DC-DC GaN converter. Energy savings are expected to be significant and affect the entire telecom network world-wide. Market is 4 million installations in US that consume 60 TWH/a.
Slide4Technical Progress SummaryThermal design and parasitic extraction complete. Design ready for review:Single phase DC-Dc at 50 W, 77% effiency at 100 MHz switching.200 W 4-phase DC-DC
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Slide5Path to MarketThis project is directly sponsored by Lockheed Martin who is providing application and market expertise. They provide an initial, and direct entrance into the market for DoD and commercial telecom markets.5
Slide6Milestone and Deliverable Summary6
MS No.Milestone DescriptionDue
Status
(complete/in-process/delayed)
Accomplishments/Notes:
4.21.1.1
Report on the speed limitations of high-speed
GaN
process. Report will include a simulation and analytical analysis of speed and integration potential to guide the decision of what components should be integrated into a
GaN
process vs. a chipset approach (LDO, voltage reference, etc.). This milestone is not on a design, but on the technology itself – it was not designed for DC-DC converters, but rather RF, so this investigates its potential for this application
Month 4
(9/30/16)
complete
QaN15 process can support switching frequencies
as high as 400
Mhz
, which reduced efficiency (60%). Power is limited by voltage breakdown (30V).
QaN25 process can support 100 MHz switching speeds, and can support significantly higher power due to its 48V breakdown.
Slide7Milestone and Deliverable Summary7
MS No.Milestone DescriptionDueStatus (complete/in-process/
delayed)
Accomplishments/Notes:
4.21.2.1
Report on DC-DC converter topologies and performance, including amplitude and phase response. The designs from this subtask should be able to support the target performance goals listed in the table below. Provide recommendation for design topology and trades on various circuit topologies. This is a review of topologies and down selection of the best one to meet the target goals. This will not be a full design, but will have partial design to determine which architecture is best to fit the target performance goals
Month 8
(1/30/17)
Complete
Single-phase
DC-DC design have been completed.
Switching transients of <10 ns have been simulated, with opportunity for 5 ns and below.
Slide8Milestone and Deliverable Summary8
MS No.Milestone DescriptionDueStatus (complete/in-process/
delayed)
Accomplishments/Notes:
G/N-G DP
A schematic design and DC-DC converter simulation results of a design to be implemented in a high-speed
GaN
process. The results will be compared to the Target Performance Goals in the table below and include a discussion of any goals not met, and limitations that prevent meeting those goals. This includes a Design Review, and Design Review documentation outlining the general topology approach, performance expectations and all applicable design equation.
Month 11
(
NCE
modified to 12/17)
On target for completion at due date.
Design is complete pending design review with sponsor and incorporation of feedback into the design.
Slide9Project Timeline9
Sept
Oct
Nov
Dec
Jan
Feb
Mar
April
May
June
July
Aug
Sept
Oct
Nov
Dec
Subtask 4.21.1
Subtask 4.21.2 Subtask 4.21.3
1.1 High-speed GaN Analysis
1.2 High BW DC-DC GaN Topology
Go-No-go decision
NCE Granted
MS 4.21.1.1
MS 4.21.2.1
Note: You only need to create this once and update quarterly. Other timeline templates may be used, as long as all the information below is provided
1.2 GaN DC-DC Design
Slide10Milestone 4.21.1.1 - CompletedEvaluated speed capabilities of QaN15 for high-speed DC-DC.300 MHz switching speeds were obtained in simulation with approximately 25% reduction in peak efficiency.At 100 MHz 85% power efficiency was achieved at 13W DC power.Partially limited by low DC power, higher output would enable higher efficiency (peak).QaN25 will provide 100 MHz switching, with increased power (up to 40W per phase). Peak efficiency is expected to be at or above target of 90%.
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Slide11Milestone 4.21.2.1 - CompletedDesigned a DC-DC converter with 6ns rise time, 60 MHz BW:Design vs. project goals
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Goal
Units
Power
200
200 (4 phase)
W
Efficiency (peak)
90
TBD
%
Efficiency (avg)
75
77
%
Rise time
< 10
6
nSec
Fall time
< 10
6
nSec
Modulation BW
100
60MHz Voltage Swing >30 30Volts Slew rate >1000 2000V/µs Current >1 >1Amp
Slide12Milestone G/N-G DP – Schedule for completionAll project goals expected to be met in final design.Thermal analysis is complete – design meets thermal targets.Parasitic analysis is complete – parasitic affect on performance to be reviewed by sponsor.
Design review for final G/N is scheduled for early Dec.12
Slide13Risks and Risk Mitigation strategyRisks have been mitigated by simulation and design changes.13
Slide14Project OutputNo IP outcomes to dateMultiple meetings with Lockheed Martin design and product teams to discuss applicability to end customer needs (products)14
Slide15Cost Status$39k spent of $50k budgetRemainder spent by end of 2017.15
Slide16NCSU
PowerAmerica For Public Release 2017
More WBG Impact and Additional impacts
Advances application of emerging high-speed, integrated
GaN
in
SiC
technologies..
Introduces WBG semiconductors into telecom applications
Product commercialization potential
direcly
after demonstration vehicle produced (not part of this Task)
Project
GaN
RF DC-DC Converter Design
Objectives:
Drastically reduce the 60 TWH/a used in base stations for telecom applications
Major Milestones:
Creation of DC-DC to replace linear power systems in telecom
Deliverables:
DC-DC Design and simulation
SOPO Task No.: 4.21
TPOC/PI: David Ricketts
Email: david.ricketts@ncsu.edu
Phone: 919-513-7361
WBG Technology Impact
Potential to replace linear power solutions for 4 million base stations
Reduction of carbon by >10 Mt CO
2/a (based on efficiency increase from 40 to 60% on base stations)