300W Wireless Power Transfer Reference Design

The 300W Wireless Power Transfer system is designed for powering devices such as drones and EVs, achieving over 90% efficiency with a compact design.

Wireless Power Transfer (WPT) technology is gaining prominence due to its ability to provide power without physical connections, offering various advantages across various applications. By eliminating the need for cables, WPT enhances convenience, safety, and durability, making it particularly beneficial for devices requiring frequent charging or operating in hazardous conditions. It also allows for greater design flexibility and supports advanced mobile and difficult-to-access applications. The 300W Wireless Power Transfer reference design by Microchip includes a Power Transmitter and a Power Receiver. 

The transmitter’s design utilizes the WP300TX01 device, while the receiver employs the WP300RX01 device. This 300W system is perfectly suited for various applications, including power tools, vacuum robots, industrial slip rings, small electric vehicles, and drones. The transmitter typically draws power from a 24V rail, and the receiver outputs a regulated voltage of 24V. The system achieves over 90% efficiency at 300W power and operates with a 5-10 mm Z-distance.

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The 300W electromagnetic inductive wireless electric power transmission applications include various uses, such as e-bikes, drones, power tools, robotic vacuum cleaners, and lawnmowers. Additionally, it can power 5G routers, underwater lighting, and various in-vehicle applications. This technology is also adaptable for consumer electronics, including laptops.

The system features include a nominal DC input voltage of 24V, with an operating range of 11V to 37V. It offers up to 90% efficiency at a power output of 300W. Safety features include foreign object detection, NFC/RFID card detection, input overvoltage and Undervoltage protection, and overcurrent and overtemperature protection. The maximum output power of the receiver can reach up to 300W, with a maximum current of 8.5A. The nominal output voltage of the receiver is set at 24V, but it can be adjusted from 12V up to 36V. Optimal efficiency is achieved when the DC input and receiver output voltage are closely aligned.

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When activated, the system transmits receiver information and feedback to the transmitter, ensuring efficient communication between components. Additionally, the system includes overpowering protection to prevent damage from excessive power delivery. It also provides a regulated DC output voltage, maintaining stable and safe operation across various applications.

The 300W Power Transmitter is designed to interface with a detachable OLED board, utilizing the SPI communication protocol for data exchange between the transmitter and the board. The subsequent section includes a table detailing the OLED screen and displayed data. This information is intended primarily for board debugging purposes. For OLED board may not be necessary for the final solution.

Microchip has tested this reference design. It comes with a bill of materials (BOM), schematics, assembly drawing, printed circuit board (PCB) layout, and more. The company’s website has additional data about the reference design. To read more about this reference design, click here.