Demonstration System EPC9111 Quick Start Guide
●The EPC9111 Wireless power demonstration system is a high efficiency, A4WP compatible, Zero Voltage Switching (ZVS), Class-D Wireless Power transfer demonstration kit capable of delivering up to 35 W into a DC load while operating at 6.78 MHz (Lowest ISM band). It includes an amplifier board (EPC9506) with a pre-regulator that limits the output current and voltage and ensures proper operation of the amplifier regardless of coupling and load variations between the source and device. The purpose of this demonstration system is to simplify the evaluation process of the wireless power technology using eGaN® FETs.
●The EPC9111 wireless power system comprises three boards (shown in figure 1) namely:
■A Source Board (Transmitter or Power Amplifier) EPC9506
■A Class 3 A4WP compatible Source Coil (Transmit Coil)
■A Category 3 A4WP compatible Device Coil with rectifier and DC smoothing capacitor.
●The amplifier board features the EPC2014C and EPC2038 enhancement mode field effect transistor (FET) in an optional half-bridge topology (single ended configuration) or default full-bridge topology (differential configuration), and includes the gate driver/s and oscillator that ensures operation of the system at 6.78 MHz The amplifier board can also be operated using an external oscillator or by using the included ultra low power oscillator.
●This revision can operate in either Single ended or Differential mode by changing a jumper setting. This allows for high efficiency operation with load impedance ranges that allow for single ended operation.
●Finally, the timing adjust circuits for the ZVS Class-D amplifiers have been separated to further ensure highest possible efficiency setting and includes separate ZVS tank circuits.
●The amplifier board is equipped with a pre-regulator that limits the DC current of the supply to the amplifier. As the amplifier draws more current, which can be due to the absence of a device coil, the pre-regulator will reduce the voltage being supplied to the amplifier that will ensure a safe operating point. The pre-regulator also monitors the temperature of the main amplifier FETs and will reduce current if the temperature exceeds 85°C. The pre-regulator can be bypassed to allow testing with custom control hardware. The board further allows easy access to critical measurement nodes that allow accurate power measurement instrumentation hookup. A simplified diagram of the amplifier board is given in figure 2.
●The Source and Device Coils are Alliance for Wireless Power (A4WP) compatible and have been pre-tuned to operate at 6.78 MHz with the EPC9506 amplifier. The source coil is class 3 and the device coil is category 3 compliant.
●The device board includes a high frequency schottky diode based full bridge rectifier and output filter to deliver a filtered unregulated DC voltage. The device board comes equipped with two LED’s, one green to indicate the power is being received with an output voltage equal or greater than 4 V and a second red LED that indicates that the output voltage has reached the maximum and is above 37 V.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2022/3/17 |
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Revision 3.2 |
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1.5 MB |
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