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Gan Systems GSWP300W-EVBPA Technical Manual

300w gan e-hemt wireless power transfer evaluation board
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GSWP300W-EVBPA
GaN E-HEMT Wireless Power Transfer Evaluation Board
Technical Manual
_____________________________________________________________________________________________________________________
GSWP300W-EVBPA
300W GaN E-HEMT Wireless Power Transfer
Evaluation Board, Optimized for Class EF2
Amplifiers
Technical Manual
Visit
www.gansystems.com
for the latest version of this technical manual.
GSWP300W-EVBPA Rev 220215
© 2022 GaN Systems Inc.
www.gansystems.com
1
Please refer to the Evaluation Board/Kit Important Notice on page 27

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Summary of Contents for Gan Systems GSWP300W-EVBPA

  • Page 1 300W GaN E-HEMT Wireless Power Transfer Evaluation Board, Optimized for Class EF2 Amplifiers Technical Manual Visit www.gansystems.com for the latest version of this technical manual. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 2 Avoid applying excessive voltages to the power supply terminals or signal inputs or outputs, always connected to the load during the test on-going. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 3 The GSWP300W-EVBPA evaluation board is designed to support and expedite the innovation of WPT systems by providing the Power Amplifier, the most challenging aspect of the system design.
  • Page 4 Figure 1 - Evaluation board overview The GSWP300W-EVBPA uses GaN Systems’ GS66508B E-HEMTs in a 6.78MHz Class EF2 power amplifier. The GS66508Bs are used with the integrated high-speed pSemi PE29102 gate driver in a push-pull configuration. The outputs of the PE29102 are capable of providing switching transition speeds in the nano-seconds range for hard switching applications.
  • Page 5 Provision has been made for a single, suitable heatsink to be fastened against the two E-HEMTs, using the two holes in the center of the bottom heatplate. Figure 2 • Top side of GSWP300W-EVBPA Evaluation Board Assembly GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc.
  • Page 6 GaN E-HEMT Wireless Power Transfer Evaluation Board Technical Manual _____________________________________________________________________________________________________________________ Figure 3 • Bottom side of GSWP300W-EVBPA Evaluation Board Assembly, showing copper coins GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 7 GSWP300W-EVBPA WPT Push-Pull EVB Block Diagram Note: The coil in Figure 4 is not included in the EVB. Figure 5• GSWP300W-EVBPA WPT Class EF2 PA Block Diagram Note: The switch devices are GaN Systems’ GS66508B E-HEMTSs GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com...
  • Page 8 GSWP300W-EVBPA GaN E-HEMT Wireless Power Transfer Evaluation Board Technical Manual _____________________________________________________________________________________________________________________ Figure 6 • GSWP300W-EVBPA WPT driver Block Diagram Figure 7 • PE29102 Dead-time Waveforms and Duty Cycle Setting Figure 8 • Dead Time vs Dead Time Resistor GSWP300W-EVBPA Rev 220215 ©...
  • Page 9 J1 can be used to control the PA system for close loop in the WPT system. A definition of the signals available on header J1 is provided in Figure 9. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 10 10A. The output of the current sensor ship is a current sense signal that goes thru buffer OP U122 and is compared to a reference voltage. The reference voltage is set with R101 and GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 11 Connectivity locations Thermal Management Thermal management of the GaN E-HEMTs in this RF power system is a critical aspect of the GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 12 Copper coins soldered beneath PCB and devices top PCB Heatplate Figure 13 • Aluminum heatplate with housing for two copper coins. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 13 _____________________________________________________________________________________________________________________ Quick Start Guide The GSWP300W-EVBPA EVB is designed to as a platform for evaluating the GS66508B E-HEMTs in a Push-Pull Class EF2 PA for WPT. This chapter will guide the user through the evaluation board overview, PA operation, bench setup and test results.
  • Page 14 Current mode (with EMI filter) Current mode JP5/JP43/JP6/JP44 on Voltage mode output RF output JP56 Current mode output RF output JP57 GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 15 60V DC current detection TP194 External oscillator monitor Evaluation Bench Test Setup The test bench setup for the GSWP300W-EVBPA EVB is shown in Figure 14. Ensure that the safety precautions mentioned on page 2 are followed. Figure 14 • Bench setup A recommended list equipment is provided below.
  • Page 16 Measure the switch node by placing the oscilloscope probe tip at JP192 and JP193 (designed for this purpose) or to the closest ground screws. Refer to Figure 15 for the proper probe technique. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 17 Plug the HV supply into J32. Pin 1: positive. Pin 2: negative. Turn the supply on and ramp the voltage from 0V to 20V. • Monitor the test point voltage by comparing the power meter measurement to GaN Systems’ test data which is available in Appendix A. •...
  • Page 18 Typical waveforms at the device’s Drain node are shown in Figure 19. Channel 1 is shown in yellow and channel 2 is shown in blue. At 77V input voltage, the output power is 150W before the EMI filter. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 19 WPT systems, and particularly advantageous for high power applications such as drone, autonomous robot and E-bike charging. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 20 Output power and efficiency of PA without EMI filter at JP56 SMA Note: With the EMI filter, the maximum power level is limited to 300W, due to the 50Ω test. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 21 Figure 20 • Thermal measurement of PA without EMI filter at 300W output power GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 22 Plug the HV supply into J32. Pin 1: positive. Pin 2: negative. Turn the supply on and ramp the voltage from 0V to 20V • Monitor the test point voltage by comparing the power meter measurement to GaN Systems’ test data which is available in Appendix A. •...
  • Page 23 EMI filter due to the loss id and mismatch loss from the EMI filter. The design of EMI filter is optimal at 30 Ω, but the data is taken at 50 Ω. Figure 22 • GSWP300W-EVBPA power (W) and efficiency (%) plotted against input voltage at 50Ω load GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc.
  • Page 24 35˚C. The temperature rise of the GaN devices is a modest 3˚C. • Figure 23 Thermal measurement of PA with EMI filter at 300W output power GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 25 GaN E-HEMT Wireless Power Transfer Evaluation Board Technical Manual _____________________________________________________________________________________________________________________ Technical Resources This document and additional technical resources are available for download from www.gansystems.com. GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 26 GaN E-HEMT Wireless Power Transfer Evaluation Board Technical Manual _____________________________________________________________________________________________________________________ Appendix A: Sample Test Data with and without EMI filter GSWP300W-EVBPA Rev 220215 © 2022 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 27...
  • Page 27 The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies GaN Systems from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.
  • Page 28 The information given in this document shall not in any event be regarded as a guarantee of performance. GaN Systems hereby disclaims any or all warranties and liabilities of any kind, including but not limited to warranties of non-infringement of intellectual property rights.