Demonstration System EPC9113 Quick Start Guide 6.78 MHz, ZVS Class-D Wireless Power System using EPC2108 / EPC2036QUICK START GUIDE Demonstration System EPC9113 DESCRIPTION The EPC9113 wireless power demonstration system is a high efficiency, parameters coil current, DC power delivered, and maximum voltage. the coil current has the lowest priority followed by the power delivered Zero Voltage Switching (ZVS), Voltage Mode class-D wireless power transfer demonstration kit capable of delivering up to 16 W into a DC with amplifier supply voltage having the highest priority. Changes in the device load power demand, physical placement of the device on load while operating at 6.78 MHz (Lowest ISM band). The purpose of this the source coil and other factors such as metal objects in proximity to demonstration system is to simplify the evaluation process of wireless the source coil all contribute to variations in coil current, DC power, and power technology using eGaN FETs and ICs. amplifier voltage requirements. Under any conditions, the controller will The EPC9113 wireless power system comprises the three boards (shown ensure the correct operating conditions for the ZVS class-D amplifier in Figure 1) namely: based on the AirFuel standard. The pre-regulator can be bypassed to allow testing with custom control hardware. The board further allows 1) A Source Board (Transmitter or Power Amplifier) EPC9509 TM 2) A Class 3 AirFuel Alliance compliant Source Coil (Transmit Coil) easy access to critical measurement nodes that allow accurate power 3) A Category 3 AirFuel compliant Device Coil with rectifier and DC measurement instrumentation hookup. A simplified diagram of the smoothing capacitor. amplifier board is given in Figure 2. The amplifier board features the enhancement-mode, half-bridge field The Source and Device Coils are AirFuel Alliance compliant and have been effect transistor (FET), the 60 V rated EPC2108 eGaN FET with integrated pre-tuned to operate at 6.78 MHz with the EPC9509 amplifier. The source coil synchronous bootstrap FET. The amplifier can be set to operate in either is class 3 and the device coil is category 3 compliant. differential mode or single-ended mode and includes the gate driver/s, The device board includes a high frequency schottky diode based full oscillator, and feedback controller for the pre-regulator that ensures bridge rectifier and output filter to deliver a filtered unregulated DC operation for wireless power control based on the AirFuel standard. This voltage. The device board comes equipped with two LEDs, one green allows for testing compliant to the AirFuel class 3 standard over a load to indicate the power is being received with an output voltage equal range as high as 50j . The pre-regulator features the 100 V rated 73 m or greater than 4 V and a second red LED that indicates that the output EPC2036 as the main switching device for a SEPIC converter. voltage has reached the maximum and is above 37 V. The EPC9509 can operate in either Single ended or Differential mode by For more information on the EPC2108 or EPC2036 please refer to the changing a jumper setting. This allows for high efficiency operation with datasheet available from EPC at www.epc-co.com. The datasheet should load impedance ranges that allow for single ended operation. be read in conjunction with this quick start guide. The timing, the timing adjust circuits for the ZVS class-D amplifiers have The Source coil used in this wireless power transfer demo system is been separated to further ensure highest possible efficiency setting and provided by NuCurrent (nucurrent.com). Reverse Engineering of the includes separate ZVS tank circuits. Source coil is prohibited and protected by multiple US and international The amplifier is equipped with a pre-regulator controller that adjusts the patents. For additional information on the source coil, please contact voltage supplied to the ZVS Class-D amplifier based on the limits of 3 NuCurrent direct or EPC for contact information. Figure 1: EPC9113 demonstration system. 2 EPC EFFICIENT POWER CONVERSION CORPORATION WWW.EPC-CO.COM COPYRIGHT 2017