EPC9112 : A4WP compliant, ZVS Class-D
wireless power transfer systems
EPC9112 is complete demonstration kit for an A4WP compliant, ZVS Class-D wireless power system operating at 6.78 MHz
The EPC9112 wireless power system comprises three boards:
1) A Source Board (Transmitter or Power Amplifier) EPC9507
2) A Class 3 A4WP compliant Source Coil (Transmit Coil)
3) A Category 3 A4WP compliant Device Coil with rectifier and DC smoothing capacitor.
The source board features the 100 V EPC2007 eGaN® FET in a half bridge topology (for single ended configuration) or full bridge topology (for differential configuration), and includes the gate driver/s and oscillator that ensures operation of the system at 6.78 MHz. The source board can also be operated using an external oscillator.
The source board is equipped with a pre-regulator that limits the current of the supply to the amplifier. 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.
The Source and Device Coils are Alliance for Wireless Power (A4WP) com¬pliant and have been pre-tuned to operate at 6.78 MHz. 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. The device board can also be configured as a half bridge rectifier that allows for double output voltage operation.