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GSWP050W-EVBPA
GaN E-HEMT Wireless Power Transfer Evaluation Board
User's Guide
_____________________________________________________________________________________________________________________
GSWP050W-EVBPA
50W 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.
GSWP050W-EVBPA Rev 190304
© 2019 GaN Systems Inc.
www.gansystems.com
1
Please refer to the Evaluation Board/Kit Important Notice on page 22
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Summary of Contents for Gan Systems GSWP050W-EVBPA
- Page 1 50W 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. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- 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. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- Page 3 The GSWP050W-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.
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Page 4: Evaluation Board Overview
Figure 1 - Evaluation board overview The GSWP050W-EVBPA uses GaN Systems’ GS61004B E-HEMTs in a 6.78MHz class EF2 power amplifier. The GS61004Bs 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 GSWP050W-EVBPA Evaluation Board Assembly Figure 2 • GSWP050W-EVBPA Rev 190304 ©...
- Page 6 GSWP050W-EVBPA GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Bottom side of GSWP050W-EVBPA Evaluation Board Assembly, showing copper coins Figure 3 • GSWP050W-EVBPA Evaluation Board heatplate Figure 4 • GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com...
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Page 7: Block Diagram
Note: The coil in Figure 5 is not included in the EVB. GSWP050W-EVBPA WPT Class EF2 PA Block Diagram Figure 6 • Note: The switch devices are GaN Systems’ GS61004B E-HEMTSs GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com... - Page 8 GSWP050W-EVBPA GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Figure 7 • GSWP050W-EVBPA WPT driver Block Diagram Figure 8 • PE29102 Dead-time Waveforms and Duty Cycle Setting Figure 9 • Dead Time vs Dead Time Resistor GSWP050W-EVBPA Rev 190304 ©...
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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. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22... -
Page 10: Protection Circuit
OP U122 and is compared to a reference voltage. The reference voltage is set with R101 and R177. Upon an over current event, a signal is generated to signal OCP_TRIG. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22... -
Page 11: Thermal Management
PCB and the Gate, Drain and Source signals are routed on the top side of the PCB. This set up provides an ultra-low thermal impedance from the die to the GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22... - Page 12 Copper coins soldered beneath PCB and devices top PCB Housing of copper coin Heatplate Figure 14 • Aluminum heatsink plate with housing for the copper coins GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- Page 13 _____________________________________________________________________________________________________________________ Quick Start Guide The GSWP050W-EVBPA EVB is designed to as a platform for evaluating the GS61004B 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.
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Page 14: Evaluation Bench Test Setup
Q76 Drain voltage TP176 25V DC current detection Evaluation Bench Test Setup The test bench setup for the GSWP050W-EVBPA EVB is shown in Figure 15. Ensure that the safety precautions mentioned on page 2 are followed. Bench setup Figure 15 •... -
Page 15: Hardware Operation
Measure the switch node by placing the oscilloscope probe tip at TP192 and TP193 (designed for this purpose) or to the closest ground screws. Refer to Figure 16 for the proper probe technique. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22... -
Page 16: Power-On Procedure
Plug the HV supply into J32. 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 17 2 is shown in blue. At 25.0V input voltage, the output power is 50W . Figure 18 • Oscilloscope Plot Showing Both GS61004B Drain Node Signals GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- Page 18 E-bike charging. Figure 19 • Spectrum Plot of output terminal JP57 SMA after 49.66dB attenuation at 51.2W output power GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- Page 19 GaN E-HEMTs run very cool, this allows operation over a very wide temperature range and extends operation to a higher power level while simultaneously simplifying the cooling system design and reducing the cost. GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
- Page 20 GaN E-HEMT Wireless Power Transfer Evaluation Board User’s Guide _____________________________________________________________________________________________________________________ Figure 21 • Thermal measurement of PA at 50W output power GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22...
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Page 21: Technical Resources
_____________________________________________________________________________________________________________________ Technical Resources This document and additional technical resources are available for download from www.gansystems.com. Appendix A: Sample Test Data GSWP050W-EVBPA Rev 190304 © 2019 GaN Systems Inc. www.gansystems.com Please refer to the Evaluation Board/Kit Important Notice on page 22... - Page 22 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 23 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.
- Page 24 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: GaN Systems GSWP050W-EVBPA...
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