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EPC EPC2019 | Demoboard EPC9512

6.78 MHz, 33 W, ZVS Class-D Wireless Power Amplifier using EPC8010/EPC2038/EPC2019

Overview

TopologySEPIC Buck-Boost Topology
Switching frequency6102-7458 kHz
IC revision3.1

Description

The EPC9512 wireless power amplifier demonstration board is a high efficiency, AirFuelTM Alliance (formerly A4WP) compatible, Zero Voltage Switching (ZVS), voltage mode class-D wireless power amplifier capable of delivering up to 33 W into a transmit coil while operating at 6.78 MHz (Lowest ISM band). The purpose of this demonstration system is to simplify the evaluation process of wireless power technology using eGaN® FETs.The amplifier board (EPC9512) features the enhancement-mode, 100 V rated EPC8010 eGaN FET as the main power stage in a dual half bridge configuration; the 100 V rated EPC2038 eGaN FET used as the synchronous bootstrap FET, and the 200 V rated EPC2019 eGaN FET used in the SEPIC pre-regulator. The amplifier can be set to operate in either differential mode or single-ended mode and includes the gate driver(s), oscillator, and feedback controller for the pre-regulator that ensures operation for wireless power control based on the AirFuel standard. This allows for compliance testing to the AirFuel class 4 standard over a load range as high as ±35j Ω. The EPC9512 can operate in either single-ended or differential mode by changing a jumper setting. This allows for high efficiency operation with load impedance ranges suitable for single ended operation.The circuits used to adjust the timing for the ZVS class-D amplifiers have been separated to further ensure highest possible efficiency setting. Each half bridge also includes separate ZVS tank circuits.The amplifier is equipped with a pre-regulator controller that adjusts the voltage supplied to the ZVS class-D amplifier based on the limits of 3 parameters: coil current, DC power delivered to the ZVS class-D amplifier, and maximum operating voltage of the ZVS class-D amplifier. The coil current has the lowest priority followed by the power delivered and amplifier supply voltage having the highest priority. Changes in the device load power demand, physical placement of the device on the source coil and other factors, such as metal objects in proximity to the source coil, contribute to variations in coil current, DC power, and amplifier voltage requirements. Under any of these conditions, the controller will ensure the correct operating conditions for the ZVS class-D amplifier based on the AirFuel standard. The pre-regulator can be bypassed to allow testing with custom control hardware. The board further allows easy access to critical measurement nodes for accurate power measurement instrumentation hookup. A simplified diagram of the amplifier board is given in figure 2.For more information on the EPC8010, EPC2038, or EPC2019 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.

Products

Order Code Data­sheet Downloads Product seriesPitch
(mm)
MountIR 1
(A)
Working Voltage
(V (AC))
PCB/Cable/PanelContact Resistance
(mΩ)
Tol. RL
(mm)
H
(mm)
CTol. CVR
(V (DC))
SizeDF
(%)
RISOCeramic TypeW
(mm)
Technical ReferencePinsRowsGenderTypeIR
(A)
PackagingColor Samples
60900213421
STE 3D IGSWR-PHD 2.54 mm Multi-Jumper Jumper with Test Point 2.54 250 20 max. 2.441000 MΩ 1 Jumper 3 Bag Black
61300111121
IGE STE 3D ALT EAG CADWR-PHD 2.54 mm THT Pin Header 2.54 THT 250 20 max. 2.541000 MΩ 1 Single Pin Header Straight 3 Bag
61300211121
IGE STE 3D ALT EAG CADWR-PHD 2.54 mm THT Pin Header 2.54 THT 250 20 max. 5.081000 MΩ 2 Single Pin Header Straight 3 Bag
645002114822
IGE STE 3D ALT EAG CADWR-WTB 3.96 mm Male Vertical Locking Header 3.96 THT 7 250 PCB 20 max. 7.921000 MΩ 2 Male Vertical 7 Bag White
885012005057
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 50 V(DC) 1 0.522 pF ±5% 50 0402 NP0 Class I 0.5 NP00402220J050DFCT10000
885012205037
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 16 V(DC) 1 0.5100 nF ±10% 16 0402 5 X7R Class II 0.5 X7R0402104K016DFCT10000
885012205052
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 25 V(DC) 1 0.522 nF ±10% 25 0402 3.5 X7R Class II 0.5 X7R0402223K025DFCT10000
885012206076
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 25 V(DC) 1.6 0.81 µF ±10% 25 0603 10 X7R Class II 0.8 X7R0603105K025DFCT10000
885012207103
STE ALT EAG CAD LTS PSP CADWCAP-CSGP MLCCs 50 V(DC) 2 1.251 µF ±10% 50 0805 10 X7R Class II 1.25 X7R0805105K050DFCT10000
Samples
Order Code Data­sheet Downloads Product seriesPitch
(mm)
MountIR 1
(A)
Working Voltage
(V (AC))
PCB/Cable/PanelContact Resistance
(mΩ)
Tol. RL
(mm)
H
(mm)
CTol. CVR
(V (DC))
SizeDF
(%)
RISOCeramic TypeW
(mm)
Technical ReferencePinsRowsGenderTypeIR
(A)
PackagingColor Samples