GaN on Silicon Technology: Devices and Applications
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1 The egan FET Journey Continues GaN on Silicon Technology: Devices and Applications Alex Lidow Efficient Power Conversion Corporation EPC - The Leader in egan FETs May, 2013 PCIM
2 Agenda Hard Switched Circuits Buck Converter Envelope Tracking Resonant Circuits Wireless Power Transmission What is in the future? EPC - The Leader in egan FETs May, 2013 PCIM
3 Key Applications Today RF DC-DC Envelope Tracking GaN Enabled Wireless Power Transmission GaN Enabled RadHard LiDAR RF Transmission Network and Server Power Supplies Point of Load Modules Solar Micro-inverters Energy Efficient Lighting Class D Audio EPC - The Leader in egan FETs May, 2013 PCIM
4 High Frequency Buck Converters CPES Gen 1 CPES Gen 2 CPES Gen 3 GaN Driver T Generations vs Efficiency GaN Gen 3 C in Efficiency SR GaN Gen Si GaN Gen Reference: D. Reusch, D. Gilham, Y. Su, and F.C. Lee, C, Gallium Nitride Based 3D Integrated Non-Isolated Point of Load Module, APEC 2012 EPC - The Leader in egan FETs May, 2013 PCIM Output Current (Io) Vin=12V Vo=1.2V Fs=1MHz L=150nH
5 Switchnode Peak and Ringing 25 V Si MOSFET ~ 5.7 ns 40 V egan FET ~ 1.5 ns 40 V Si MOSFET ~ 7.5 ns 3 V/Div 5 ns/div EPC - The Leader in egan FETs May, 2013 PCIM
6 Envelope Tracking (ET) EPC - The Leader in egan FETs May, 2013 PCIM
7 Peak to Average Power Ratio Same average Reference: Nujira.com website EPC - The Leader in egan FETs May, 2013 PCIM
8 Effect of PAPR Average Power Peak Power Fixed supply PAPR = 0dB Peak efficiency up to 65% Average efficiency only 25 % Increasing PAPR Output Probability Output Power (dbm) EPC - The Leader in egan FETs May, 2013 PCIM
9 Effect of Envelope Tracking Average efficiency > 50 % (incl. ET) Envelope Tracking Average Power Output Probability Output Power (dbm) EPC - The Leader in egan FETs May, 2013 PCIM
10 Envelope Tracking Supply ET power supply topologies vary Open loop boost full BW required Closed loop linear-assisted Buck* Buck ~ 10% Bandwidth ~ 90% Power Linear AMP ~ 10% Power Highest 90% of Bandwidth *Reference: V. Yousefzadeh, et al, Efficiency optimization in linear-assisted switching power converters for envelope tracking in RF power amplifiers, ISCAS 2005 EPC - The Leader in egan FETs May, 2013 PCIM
11 15 A OUT / 1 MHz Single φ Buck Modified an EPC9002 development board 45 V IN Before After Output Inductor 22 V OUT Common EPC - The Leader in egan FETs May, 2013 PCIM
12 Efficiency Results 98% 16 97% 14 96% 12 Efficiency (%) 95% 94% 93% 4 MHz Efficiency Power loss (W) 92% 1 MHz Efficiency 4 91% 90% 2 1 MHz Losses Output Power (W) 4 MHz Losses EPC - The Leader in egan FETs May, 2013 PCIM
13 Wireless Power EPC - The Leader in egan FETs May, 2013 PCIM
14 Wireless Power EPC - The Leader in egan FETs May, 2013 PCIM
15 Block Diagram of the Wireless System PSU Source Unit Un-Regulated DC output 24V DC + Gate Driver PSU Gate Driver Matching Impedance Network Resonant Source Capture Device Matching Impedance Network Device Unit Feedback and Basic Control WiTricity Coils Load EPC - The Leader in egan FETs May, 2013 PCIM
16 Experimental System Setup Coil Feedback egan FETs RF connection Device Coil Device Board 25mm 50mm Source Board MOSFET RF connection Source Coil RF connection EPC - The Leader in egan FETs May, 2013 PCIM
17 Efficiency as Function of Load Power Efficiency [%] MHz, 23.6 Ω load V in =8V V out =6.8V V in =22V V out =18.3V Output Power [W] EPC - The Leader in egan FETs May, 2013 PCIM
18 What s in the Future? EPC - The Leader in egan FETs May, 2013 PCIM
19 Beyond 600 Volts Rated R DS(ON) mω LGA Package mω 5x6mm PQFN mω 5x6mm 250 PQFN 90 mω 8x8mm PQFN mω 5x6mm 400 PQFN 150 mω 8x8mm PQFN Rated V DSS(MAX) EPC - The Leader in egan FETs May, 2013 PCIM
20 Beyond Discrete Devices Driver On Board Discrete FET with Driver Full-Bridge with Driver and Level Shift EPC - The Leader in egan FETs May, 2013 PCIM
21 Summary GaN transistors enable exciting new applications such as RF Envelope Tracking and Wireless Power Transmission GaN transistors have the potential to replace silicon power MOSFETs in power conversion applications with a low-cost and higher efficiency solution egan FETs are straightforward to use, but you can t just drop them into a MOSFET socket. Some R&D is needed start today! EPC - The Leader in egan FETs May, 2013 PCIM
22 The end of the road for silicon.. is the beginning of the egan FET journey! EPC - The Leader in egan FETs May, 2013 PCIM
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