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GSWP300W-EVBPA

GaN E-HEMT Wireless Power Transfer Evaluation Board

Technical Manual

_____________________________________________________________________________________________________________________

GSWP300W-EVBPA Rev 220215

www.gansystems.com 25

Please refer to the Evaluation Board/Kit Important Notice on page 27

Technical Resources

This document and additional technical resources are available for download from

www.gansystems.com

Summary of Contents for GSWP300W-EVBPA

Page 1: ...__________________________________ GSWP300W EVBPA Rev 220215 2022 GaN Systems Inc www gansystems com 1 Please refer to the Evaluation Board Kit Important Notice on page 27 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 ...

Page 2: ...low all locally approved safety procedures when working around high voltage Never leave the board operating unattended After it is de energized always wait until all capacitors are discharged before touching the board This board should be handled by qualified personnel ONLY PCB surface and devices can become hot Contact may cause burns Do not touch CAUTION This product contains parts that are susc...

Page 3: ...e to many charging ease of installation suitability for high power levels and fast charging Table 1 provides a comparison between inductive charging and magnetic resonant charging GaN E HEMTS are a key enabler of magnetic resonant charging because their extremely fast switching speeds on the order of a few nanoseconds result in very low switching losses This allows them to operate efficiently at v...

Page 4: ...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 This Technical Manual includes a circuit description a quick start guide and measurement results Evaluation Kit Contents and Requirem...

Page 5: ...15A TEK scope with current probe TCM0030A Fluke 87 multimeter for input current 50dB 500W attenuator as load Spectrum analyzer Power meter Thermal meter Evaluation Board Assembly Overview The evaluation board EVB is assembled with two GS66508B E HEMT transistors and two PE29102 GaN E HEMT drivers Headers are included for monitoring the signal input signal output power connections and detection mon...

Page 6: ...__________________________________________________________________________________________ GSWP300W EVBPA Rev 220215 2022 GaN Systems Inc www gansystems com 6 Please refer to the Evaluation Board Kit Important Notice on page 27 Figure 3 Bottom side of GSWP300W EVBPA Evaluation Board Assembly showing copper coins ...

Page 7: ...15 2022 GaN Systems Inc www gansystems com 7 Please refer to the Evaluation Board Kit Important Notice on page 27 Block Diagram The block diagram of the evaluation board is provided in Figures 4 through 6 Figure 4 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...

Page 8: ...__________________________________________________________ GSWP300W EVBPA Rev 220215 2022 GaN Systems Inc www gansystems com 8 Please refer to the Evaluation Board Kit Important Notice on page 27 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 ...

Page 9: ...ll configuration with an EMI filter Single ended mode Operation without an EMI filter Operation with an external oscillator signal input Users can run multiple PAs together at the same frequency for high power operation Detailed operation procedures and setup for these alternative configurations are provided in the section titled quick start guide The PA includes an over temperature protection cir...

Page 10: ... to protect against input DC overcurrent device over temperature output RF overvoltage and Voltage Standing Wave Ratio VSWR protection The protection signals are combined by U133 a 3 inputs OR gate logic chip and will shut the driver down under a fault condition Input DC overcurrent protection OCP U91 is the DC current sensor chip which can handle a maximum of 10A The output of the current sensor ...

Page 11: ...and two diode D50 D53 These two voltage detection signals go to a two channel comparator U68 and are combined with OR gate U70 into one overvoltage trigger OVP_TRIG The OVP and OCP go into a hard combine circuit D45 which a dual diode in one To generate an overcurrent overvoltage protection trigger signal Standing Wave Ratio SWR detection two of coupler T2 T83 comprise of the board band bidirectio...

Page 12: ...s the range of operating temperature The GS66508B are bottom side cooled devices that use GaNPX packaging designed for optimal thermal performance For effective thermal management a hole is cut out of the PCB to permit access to the copper coins The two GS66508Bs bottom side thermal pads are soldered directly onto the copper coins on the bottom side of the PCB and the Gate Drain and Source signals...

Page 13: ...erview Kit Contents The GSWP300W EVBPA evaluation kit contains Power Amplifier evaluation board assembly PA heatplate PA EMC shield 4 pins DC cord Evaluation board specifications Table 3 EVB specifications PARAMETER SPECS Input Voltage range 100VDC max Tx output power 300W Tx efficiency peak 88 Topology Class EF2 Frequency 6 78 MHz Switching type Push Pull GaN Systems part number GS66508B Number o...

Page 14: ...Note The maximum output power depends on the input voltage as shown in Figures 19 and 22 Configurations The PA can be configured into three different operating options voltage mode current mode and single ended Table 4 describes how to configure the board using the jumpers provided Table 4 Configuration options Jumper Option Jumper on off JP51 Internal oscillator default JP51 on JP52 off JP52 Exte...

Page 15: ...t points locations are silkscreened on the PCB Table 5 Test point description Test point Description TP197 U90 input PE29102 driver TP76 U6 input PE29102 driver TP8 Q77 Gate voltage TP81 Q76 Gate voltage TP189 Q77 Drain voltage TP82 Q76 Drain voltage TP176 60V DC current detection TP194 External oscillator monitor Evaluation Bench Test Setup The test bench setup for the GSWP300W EVBPA EVB is shown...

Page 16: ...nd configuration 1 First set the current limit to 0 3A for the 5VDC supply feeding JP35 or J28 2 Set the current limit to 1A for the HV DC supply feeding J32 or J28 at a voltage of between 20VDC and 50VDC 3 Verify that all DC power supplies are turned off 4 Make sure the load is connected to JP56 or JP57 5 Verify the Class EF2 waveform via test points TP8 TP81 with J32 5VDC 6 Connect the VDD power...

Page 17: ...ellent thermal conduction apply thermal grease to the PA heatsink interface before screwing the units together Enough thermal grease should be applied so that a small amount extrudes on all four sides as the screws are tightened Wipe the assembly clean Make sure jumpers JP5 JP43 JP6 JP44 are off Solder the wires with the SMA connector to JP56 Connect the load to JP56 Plug the 5VDC supply into JP35...

Page 18: ... achieved at a duty cycle of approximately 35 At that operating point the PA can work under very ZVS wide impedance range with high efficiency The PA duty cycle is controlled by gate driver PE29102A For a detailed time delay design please refer to Figure 8 and Figure 9 The total resistor value of R955 R965 dominates the dead time of U86 and the delay time of U90 is controlled by R953 R952 Both two...

Page 19: ...rs have a lot of harmonics at the output One significant advantage of the Class EF2 topology is that it has a lower 2nd harmonic when compared to other PA topologies This advantage results in a Class EF2 PA with much better EMI performance Figure 18 shows the spectrum of the PA at 70W output power without an EMI filter Compared to the fundamental frequency the 2nd harmonic is 35dBc the 3rd harmoni...

Page 20: ... Rev 220215 2022 GaN Systems Inc www gansystems com 20 Please refer to the Evaluation Board Kit Important Notice on page 27 Figure 18 Spectrum Plot of output terminal JP56 SMA after 49 66dB attenuation at 300W output power Operation without an EMI filter Figure 19 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 du...

Page 21: ...side cooled GaNPX packaging provides an extremely low thermal impedance for efficient heat transfer to the heatsink thereby drawing heat out of the device This GaN based design is able to operate over a wide ambient temperature and with convection cooling eliminating the need for cooling fans These advantages support a PA design with excellent thermal performance up to 300W output power The temper...

Page 22: ...ug 5VDC supply into JP35 Pin 1 positive Pin 2 negative Adjust the voltage to 5V 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 If the measurements correlate increase the HV supply to 60VDC IMPORTANT Ensur...

Page 23: ...m plot of output terminal JP57 SMA after 49 66dB attenuation at 300W output power Operation with EMI filter The output power and efficiency with an EMI filter are shown in Figure 22 This PA design delivers 88 efficiency at 300W output power and 100VDC input voltage This efficiency performance is lower than the one of without EMI filter due to the loss id and mismatch loss from the EMI filter The d...

Page 24: ... gansystems com 24 Please refer to the Evaluation Board Kit Important Notice on page 27 The SEEK thermal camera photo of the PA is depicted in Figure 23 The thermal performance with EMI filter is very impressive The hottest points of the circuit are the two 2nd harmonics shunt inductors which have a temperature rise of 35 C The temperature rise of the GaN devices is a modest 3 C Figure 23 Thermal ...

Page 25: ...________________________________________________________________________ GSWP300W EVBPA Rev 220215 2022 GaN Systems Inc www gansystems com 25 Please refer to the Evaluation Board Kit Important Notice on page 27 Technical Resources This document and additional technical resources are available for download from www gansystems com ...

Page 26: ...________________________________________________________________________________________________________ GSWP300W EVBPA Rev 220215 2022 GaN Systems Inc www gansystems com 26 Please refer to the Evaluation Board Kit Important Notice on page 27 Appendix A Sample Test Data with and without EMI filter ...

Page 27: ...he board kit may be returned within 30 days from the date of delivery for a full refund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR...

Page 28: ...omponents are not designed authorized or warranted for use in lifesaving life sustaining military aircraft or space applications nor in products or systems where failure or malfunction may result in personal injury death or property or environmental damage 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...

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