EPC EPC9514 User manual

Demonstration
System EPC9514
Quick Start Guide
6.78 MHz, 27 W, 19 V Regulated Wireless Power Receiver
using EPC2016C
Revision 1.0

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2 | | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018
Demonstration Board EPC9514
DESCRIPTION
The EPC9514 demonstration board is a 6.78 MHz (Lowest ISM band)
highly resonant wireless power receiver capable of delivering up to
27 W as a 19 V regulated output when operating to the AirFuel™ standard
(excluding the BLE communications). This board is intended to power
products such as small laptops when used in a wireless power system.
The EPC9514 includes a Category 5 AirFuel Alliance compliant device coil
and circuit with high frequency Schottky diode based full bridge rectier,
DC smoothing capacitor and 19 V regulator. The regulator is based on a
SEPIC converter that features a 100 V EPC2016C eGaN® FET. The power
circuit is attached to the coil. A photo of the EPC9514 is shown in gure 1.
For more information on the EPC2016C eGaN FETs, please refer to the
datasheet available from EPC at www.epc-co.com. The datasheet should
be read in conjunction with this quick start guide.
DETAILED DESCRIPTION
The schematic diagram of the EPC9514 is shown in Figure 2 and comprises
a tuning circuit for the device coil with a common-mode choke for EMI
suppression, a high frequency rectier and SEPIC based output regulator.
The EPC9514 is powered using a Category 5 AirFuel compliant device coil
and by default is tuned to 6.78 MHz for the specic coil provided with it.
The tuning circuit comprises both parallel and series tuning which is also
dierential to allow balanced connection and voltage reduction for the
capacitors.
Two LEDs have been provided to indicate that the board is receiving
power with an un-regulated voltage greater than 4 V (green LED) and
the red LED will illuminate when the un-regulated voltage exceeds 44 V.
The EPC9514 has limited over-voltage protection using a TVS diode that
clamps the un-regulated voltage to 46 V. This can occur when the receive
coil is placed above a high power transmitter with insucient distance
to the transmit coil and there is little or no load connected. During an
over-voltage event, the TVS diode will dissipate a large amount of power
and the red LED will illuminate indicating an over-voltage. The receiver
should removed from the transmitter as soon as possible to prevent the
TVS diode from over-heating.
Figure 1: EPC9514 demonstration system.
Table 1: Performance Summary (TA= 25°C) EPC9514
Symbol Parameter Conditions Min Max Units
VUnreg Un-regulated output voltage 12.5 48 V
IUnreg Un-regulated output current 1.4* A
VUnreg_UVLOR UVLO Enable Un-regulated voltage rising 25 V
VUnreg_UVLOF UVLO Disable Un-regulated voltage falling 12.5 V
VOUT Output Voltage Range VUnreg_min = 8.3V 18.75 19.25 V
IOUT Output Current Range VUnreg_min = 8.3V 0 1.4* A
* Actual maximum current subject to operation temperature limits.
Figure 2: Schematic diagram of the EPC9514 demo board.
152 mm
115 mm
Load
Device
coil
Un-Regulated
DC output
Tuning Network Rectier Regulator
Regulated
DC output
Coil connection
COUT
19 VDC
CRect CSeptic
Q1
Drect
Llower
LM11
LM1
CMx
CMPx
LE1 CMx
Lupper

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Demonstration Board EPC9514
DETAILED DESCRIPTION (continued)
The EPC9514 can be operated with or without the regulator. The regulator
can be disabled by inserting a jumper into position JP50 and connecting
the load directly to the unregulated output terminals. In regulated
mode, the design of the EPC9514 controller will ensure stable operation
in a wireless power system. The regulator operates at 300 kHz and the
controller features over current protection that limits the current drawn by
the regulator to 2 A.
The EPC9514 device boards come equipped with kelvin connections
for easy and accurate measurement of the un-regulated and regulated
output voltages. The rectied voltage current can also be measured using
the included shunt resistor. In addition, the EPC9514 has been provided
with a switch-node measurement connection for low inductance
connection to an oscilloscope probe that yield reliable waveforms.
The EPC9514 is designed to operate in conjunction with EPC9120 and
EPC9129 (33 W EPC9512) transmitter units.
Figure 3 shows the proper connection method to the EPC9514.
QUICK START PROCEDURE
The EPC9514 demonstration system is easy to set up and evaluate the
performance of the eGaN FET in a wireless power transfer application.
Refer to Figure 3 for proper connection and measurement setup before
following the testing procedures.
The EPC9514 can be operated using any one of two alternative methods:
a. Using the regulator
b. Bypassing the regulator
a. Operation using the regulator
In this mode, the regulator is used to provide a xed output voltage of 19 V
for the wireless power receiver and will limit the output current to 1.4 A.
1. Make sure the entire system is fully assembled (this includes the wireless
power transmitter) prior to making electrical connections and make
sure jumper JP50 is NOT installed. Connect the load to the regulated
output and connect all required instrumentation according to gure 3.
2. Power up the wireless power transmitter and observe that the EPC9514
receives power via the green LED, un-regulated voltage and output
voltage.
3. Once operation has been conrmed, observe the output voltage and
other parameters on the device board.
4. For shutdown, please follow steps in the reverse order.
b. Bypassing the regulator
In this mode, the regulator is disabled and the load connected directly to
the un-regulated output of the board. There is no protection against over-
current in this mode.
1. Make sure the entire system is fully assembled (this includes the wireless
power transmitter) prior to making electrical connections and make
sure jumper JP50 is installed. Connect the load to the un-regulated
output and connect all required instrumentation according to gure 3.
2. Power up the wireless power transmitter and observe that the EPC9514
receives power via the green LED, un-regulated voltage and output
voltage.
3. Once operation has been conrmed, observe the output voltage and
other parameters on the device board.
4. For shutdown, please follow steps in the reverse order.
Figure 3: Proper connection and measurement setup for the receiver board.
Disable RegulatorCoil Connection
V
Rectier Voltage
(12.5 V – 48 Vmax)
V
mV
Regulated load
connection
Coil tuning
Rectier DC Current
(75 mΩ Shunt)
Rectier voltage
> 4 V LED
Rectier voltage
> 44 V LED
Un-Regulated
load connection
Regulated
voltage
measurement
Regulator
Switch-node
measurement points

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Demonstration Board EPC9514
MEASUREMENT NOTES
When measuring the high frequency content such as the switch-node,
care must be taken to avoid long ground leads. An oscilloscope probe
connection (preferred method) has been built into the board to simplify
the measurement of the switch-node voltage (shown in Figure 3).
PRECAUTIONS
The EPC9514 demonstration system has limited enhanced protection
systems (thermal and electrical) and therefore should be operated with
caution. Some specic precautions are:
1. Never operate the EPC9514 receiver with a transmitter that is AirFuel
compliant as this system does not communicate with the source to
correctly setup the required operating conditions and doing so may lead
to the failure. Please contact EPC at [email protected] should operating
the system with an AirFuel compliant device be required to obtain
instructions on how to do this.
2. There is no heat-sink on the devices and during experimental evaluation
it is possible present conditions to the regulator that may cause the
device to overheat. Always check operating conditions and monitor the
temperature of the EPC devices using an IR camera.
3. Never connect the EPC9514 device board into your VNA in an attempt to
measure the input impedance. Doing so can severely damage the VNA.
4. Exercise caution when handling the coil while in operation as high RF
voltages are present and can lead to RF burns.
5. Please contact EPC at [e-mail] should the tuning of the coil
be required to change to suite specic conditions so that it can be
correctly adjusted for use with this board.
THERMAL CONSIDERATIONS
The EPC9514 demonstration system showcases the EPC2016C eGaN FETs
in a wireless energy transfer application. Although the electrical perfor-
mance surpasses that of traditional silicon devices, their relatively smaller
size does magnify the thermal management requirements. The operator
must observe the temperature of the gate driver and eGaN FET to ensure
that both are operating within the thermal limits as per the datasheets.
Table 2: Rev 1.0 Bill of Materials
Item Qty Reference Part Description Manufacturer Part #
1 1 C44 100 pF, 25 V Würth 885012205038
2 1 C50 100 nF, 100 V Murata GRM188R72A104KA35D
3 4 C51, C56, C57, C91 100 nF, 16 V Würth 885012205037
4 1 C53 220 pF, 50 V Murata GRM155R71H221KA01D
5 2 C55, C90 1 μF, 25 V TDK C1005X5R1E105M050BC
6 6 C61, C62, C63, C68, C71, C72 10 μF, 50 V Taiyo Yuden UMK325BJ106MM-T
7 3 C64, C65, C66 22 μF, 35 V TDK C3216JB1V226M160AC
8 1 C67 10nF, 200 V Kemet C0603C103K2RACTU
9 1 C70 10 μF, 50 V Nichicon UZR1H100MCL1GB
10 1 C84 100 nF, 50 V Murata GRM188R71H104KA93D
11 1 C85 10 μF, 50 V Taiyo Yuden UMK325BJ106MM-T
12 1 C92 22 pF, 50 V Würth 885012005057
13 2 CM1, CM11 390 pF Vishay VJ1111D391KXLAJ
14 1 Coil Receive Coil NuCurrent NC20-T025L01E-152-115-0R75
15 1 D51 30 V, 500 mA ST STPS0530Z
16 1 D60 100 V, 5 A Diodes PDS5100-13
17 1 D67 200 V, 1 A Diodes Inc. DFLS1200
18 4 D80, D81, D82, D83 60 V 1 A Diodes Inc. PD3S160-7
19 1 D84 LED 0603 Green Lite-On LTST-C193KGKT-5A
20 1 D85 2.7 V, 250 mW Nexperia BZX84-C2V7,215
21 1 D86 LED 0603 Red Lite-On LTST-C193KRKT-5A
22 1 D87 43 V, 250 mW Nexperia BZX84-C43,215
23 1 D88 44 V, 51.6 A Littelfuse SMDJ36A
24 1 GP60 .1" Male Vert. Würth 61300111121
25 2 J2, J3 .1" Male Vert. Amphenol FCI 95278-101A04LF
(continued on next page)

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5 | | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018
Demonstration Board EPC9514
Table 2: Rev 1.0 Bill of Materials (continued)
Item Qty Reference Part Description Manufacturer Part #
26 1 JP50 .05" 2 pos Male Vert Sullins GRPB021VWVN-RC
27 2 L60, L61 22 μH, 4.3A Vishay Dale IHLP3232DZER220M11
28 1 L90 10 μH, 150 mA Taiyo Yuden LBR2012T100K
29 1 LE1 25 µH, 5.3 A Eaton CMS2-1-R
30 2 LM1, LM11 82 nH Würth 744912182
31 1 Q60 100 V, 11 A, 16 mΩ EPC EPC2016C
32 1 R40 84.5 kΩ 1% Panasonic ERJ-3EKF8452V
33 1 R41 6.04 kΩ Panasonic ERJ-2RKF6041X
34 1 R50 10 Ω Panasonic ERJ-3EKF10R0V
35 1 R51 124 kΩ 1% Panasonic ERJ-2RKF1243X
36 1 R52 56.2 kΩ 1% Yageo RC0402FR-0756K2L
37 1 R53 2.32 kΩ Yageo RC0402FR-072K32L
38 1 R54 300 Ω Yageo RC0402JR-07300RL
39 1 R57 2.49 MΩ 1% Yageo RC0603FR-072M49L
40 1 R58 150 kΩ 1% Panasonic ERJ-2RKF1503X
41 1 R60 22 mΩ, 0.4 W Vishay Dale WSLP0603R0220FEB
42 1 R67 10 kΩ, 5% 2/3 W Panasonic ERJ-P08J103V
43 1 R80 75 mΩ, 1 W Stackpole CSRN2512FK75L0
44 1 R81 4.7 kΩ Stackpole RMCF1206FT4K70
45 1 R82 422 Ω Yageo RMCF0603FT422R
46 1 R90 2 .2 Ω Yageo RC0402JR-072R2L
47 1 R92 20 Ω Stackpole RMCF0402JT20R0
48 4 TP1, TP2, TP3, TP4 SMD probe loop Keystone 5015
49 1 U50 Boost Controller Texas Instruments LM3481MM/NOPB
50 1 U90 Gate Driver with LDO Texas Instruments UCC27611DRV
Table 3: Optional Components
Item Qty Reference Part Description Footprint
1 1 D61 100 V 5 A Diode PowerDI5 / SMB

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6 | | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018
Demonstration Board EPC9514
Figure 4: EPC9514 Receiver schematic.
60 V1 A
D80
PD3S160-7
10 µF 50 V
C85
Vrect
100 nF, 50 V
C84
VrectV rect
R X C oi l
SM D probe loop
1
TP1
SM D probe loop
1
TP2
K elvin O utput C urrent
SM D probe loop
1
TP3
SM D probe loop
1
TP4
Vunreg
DNP
CMP1
390 pF
CM1
DNP
CM2
DNP
CM12
DNP
CMP2
K elvin O utput Voltage
L M1
82nH
L M11
82 nH
4.7 k
12
R81
Vunreg
422 Ω
1
2
R82
Vunreg
L E D 0603 G reen
D84
L E D 0603 R ed
D86
2.7 V250 mW
D85
Coil2
Coil1
1
2
25 µH 5.3 A
3
4
L E 1
Isns
.05" 2 pos Male V ert
1
2
JP50
E MPT Y
R egul ator Di sable
FA/SD
Vout
5 V5V GD
5V GD
GL PH
GL PL
G ate D ri ver
2.2 Ω
1 2
R90
GL PLGL PH
SW
GND
PreDR PWM
124 k 1%
1
2
R51
6 V
220 pF, 50 V
C53
Ground Post
10 µF, 50 V
C62
10 µF, 50 V
C61
22 µF 35 V
C64
V fdbk
Isns
10 µF
50 V
C63
6
2
3EP
4
5
LDO VREF
VSS
1 VDD
U90
UCC27611DRV
Isns
Isns
Isns
Isns
10 µH 150 mA
L 90
Isns
Comp
100 nF, 100 V
C50
10E
1 2
R50
1
.1" M ale Vert.
GP60
1
ProbeHole
PH60
20 Ω
1 2
R92
100 nF, 16 V
C91
22 pF, 50 V
C92
5V GD
5V GD
1 µF, 25 V
C55
2.49 M1%
1
2
R57
150 k 1%
1
2
R58
U V LO
7 5
Bias
Osc
4
8
Pgnd
1.275 V
Cnt
FA/Sync/SD
FB
Comp
10
6
Agnd
Isens
Vin
3
1
DR
2
9
UVLO
U50
L M3481MM/NOPB
44 V, 51.6 A
D88
SM DJ36A
CZR U52C 5V 1
D90
E MPT Y
V fdbk
100 pF, 25 V
C44
Vout
Output Voltage Set
6.04 k
1
2
R41
30 V500 mA
D51
ST PS0530Z
12
R55
E MPT Y
C54
E MPT Y
V fdbk
200 V, 1 A
D67
DFL S1200
10 nF, 200 V
C67
10 k 5%2/3 W
12
R67
Vrect
Vunreg V unreg
Vunreg
Vunreg
Vunreg
Vout
5 V
Snubber
22 µH 4.3 A
L 61
22 µH 4.3 A
L 60 22 µF 35 V
C65
22 µF 35 V
C66
Vout Vout
10 µF 50 V
C68
100 nF, 16 V
C56
6V
6 V
100 nF, 16 V
C57
1 µF, 25 V
C90
1 2
75 mΩ 1W
R80
Set to 300 kHz
Disable = 12.5 V
E nable = 25 V
Vunreg
Vunreg
1
2
3
4
.1" M ale Vert.
J3
Vout
10 µF, 50 V
C72
10 µF, 50 V
C71
Vunreg V unreg
C52
E MPT Y
56.2 k 1%
12
R52
300 Ω
1 2
R54
84.5 k 1%
1 2
R40
2.32 k
12
R53
100 nF, 16 V
C51
set to 19 V
100 V5 A
D60
PDS5100-13
100 V5 A
D61
E MPT Y
1 2
22 mΩ 0.4 W
R60
43 V250 mW
D87
60 V1 A
D82
PD3S160-7
60 V1A
D81
PD3S160-7
60 V1A
D83
PD3S160-7
+C70
10 µF, 50 V
Vunreg
390 pF
CM11
100 V 11 A 16 mΩ
Q60
EPC 2016C
Cat 6 C oil
Coil
NC20-T 025L01E -152-115-0R75
1
2
3
4
.1" M ale Vert.
J2
Receive Indicator
Vout > 4 V
Over-Voltage Indicator
Vout > 46 V
Overvoltage Protection

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Demonstration Board Warning and Disclaimer
The EPC9514 board is intended for product evaluation purposes only and is not intended for commercial use. Replace components on the Evaluation Board only with those parts shown on
the parts list (or Bill of Materials) in the Quick Start Guide. Contact an authorized EPC representative with any questions.
This board is intended to be used by certied professionals, in a lab environment, following proper safety procedures. Use at your own risk.
As an evaluation tool, this board is not designed for compliance with the European Union directive on electromagnetic compatibility or any other such directives or regulations. As board
builds are at times subject to product availability, it is possible that boards may contain components or assembly materials that are not RoHS compliant. Ecient Power Conversion
Corporation (EPC) makes no guarantee that the purchased board is 100% RoHS compliant.
The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this Quick Start Guide constitute a sales contract or create any kind of warranty, whether express
or implied, as to the applications or products involved.
Disclaimer: EPC reserves the rightat anytime, without notice, to make changes to any products described herein to improve reliability, function, or design.EPC does not assumeany liability
arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, or other intellectual property whatsoever, nor the
rights of others.