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Gan Systems GSWP100W-EVBPA User Manual

100w gan e-hemt wireless power transfer evaluation board, optimized for class ef2 amplifiers
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GSWP100W-EVBPA
GaN E-HEMT Wireless Power Transfer Evaluation Board
User's Guide
_____________________________________________________________________________________________________________________
GSWP100W-EVBPA
100W GaN E-HEMT Wireless Power Transfer
Evaluation Board, Optimized for Class EF2
Amplifiers
User's Guide
Visit
www.gansystems.com
for the latest version of this user's guide.
GSWP100W-EVBPA Rev 180529
© 2018 GaN Systems Inc.
www.gansystems.com
1
Please refer to the Evaluation Board/Kit Important Notice on page 26

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Summary of Contents for Gan Systems GSWP100W-EVBPA

  • Page 1 100W GaN E-HEMT Wireless Power Transfer Evaluation Board, Optimized for Class EF2 Amplifiers User’s Guide Visit www.gansystems.com for the latest version of this user’s guide. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • 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. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 3 The GSWP100W-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 A magnetic resonant wireless power transfer design. Evaluation board overview The GSWP100W-EVBPA uses GaN Systems’ GS61008P E-HEMTs in a 6.78MHz class EF2 power amplifier. The GS61008Ps 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. Top side of GSWP100W-EVBPA Evaluation Board Assembly Figure 2 • GSWP100W-EVBPA Rev 180529 ©...
  • Page 6 GSWP100W-EVBPA GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Bottom side of GSWP100W-EVBPA Evaluation Board Assembly, showing copper coins Figure 3 • GSWP100W-EVBPA Evaluation Board heatplate Figure 4 • GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com...

  • Page 7: Block Diagram

    Note: The coil in Figure 5 is not included in the EVB. GSWP100W-EVBPA WPT Class EF2 PA Block Diagram Figure 6 • Note: The switch devices are GaN Systems’ GS61008P E-HEMTSs GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com...
  • Page 8 GSWP100W-EVBPA GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Figure 7 • GSWP100W-EVBPA WPT driver Block Diagram Figure 8 • PE29102 Dead-time Waveforms and Duty Cycle Setting Figure 9 • Dead Time vs Dead Time Resistor GSWP100W-EVBPA Rev 180529 ©...

  • Page 9: Circuit Description

    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 10. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • 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 GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...

  • Page 11: Thermal Management

    The GS61008P are bottom-side cooled devices that use GaN ® packaging, designed for optimal GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 12 Copper coins soldered beneath PCB and devices top PCB Heatplate Figure 14 • Aluminum heatplate with housing for two copper coins. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...

  • Page 13: Quick Start Guide

    _____________________________________________________________________________________________________________________ Quick Start Guide The GSWP100W-EVBPA EVB is designed to as a platform for evaluating the GS61008P 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 JP43 off / JP44 on Voltage mode output RF output JP56 Current mode output RF output JP57 GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 15 60V DC current detection TP194 External oscillator monitor Evaluation Bench Test Setup The test bench setup for the GSWP100W-EVBPA EVB is shown in Figure 15. Ensure that the safety precautions mentioned on page 2 are followed. Bench setup Figure 15 •...
  • 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 16 for the proper probe technique. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 17 • voltage from 0V to 10V. • Monitor the test point voltage by comparing the power meter measurement to GaN Systems’ test data which is available in Appendix A. If the measurements correlate, increase the HV supply to 28V •...
  • Page 18 Typical waveforms at the devices Drain node are shown in Figure 17. Channel 1 is shown in yellow and channel 2 is shown in blue. At 31V input voltage, the output power is 100W before the EMI filter. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 19 WPT systems, and particularly advantageous for high power applications such as drone, autonomous robot and E-bike charging. GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 20 First, they have very low switching losses which allows them to operate at high efficiency and a low temperature rise at 6.78MHz, the common frequency used for resonant wireless GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 21 Figure 21 • Thermal measurement of PA without EMI filter at 100W output power GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 22 Plug the HV supply into JP32. Pin 1: positive. Pin 2: negative. Turn the supply on and ramp the voltage from 0V to 10V Monitor the test point voltage by comparing the power meter measurement to GaN Systems’ • test data which is available in Appendix A.
  • Page 23 Figure 23 • GSWP100W-EVBPA power (W) and efficiency (%) plotted against input voltage at 50Ω load The SEEK thermal camera photo of the PA is depicted in Figure 24. The thermal performance with EMI filter is very impressive. The hottest points of the circuit are the two 2 harmonics shunt inductors which have a temperature rise of 35˚C.
  • Page 24 GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Figure 24 • Thermal measurement of PA with EMI filter at 100W output power GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 25 This document and additional technical resources are available for download from www.gansystems.com. Appendix A: Sample Test Data with and without EMI filter GSWP100W-EVBPA Rev 180529 © 2018 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 26...
  • Page 26 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 27 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.