Wireless Power Transfer Coil Design

Efficient operation of a wireless power transfer wpt system is a major design challenge in many wpt applications.

Wireless power transfer coil design. The coil combination in a compact pet sleeve with adhesive surface can be used according to the qi 5 w and 15 w and airfuel alliance standards as well as in proprietary solutions with higher power. Efficiency of power transfer is closely related to q factory of primary and secondary coils their sizes materials as well as the distance between of the coils the characteristics of the transmitter and receiver coils are crucial to achieve low power transmission losses. Introduction the growing number of wireless power transfer wpt applications demand highly efficient wpt at ranges well. The main concept of this project is to design a device for the concept of wireless power transfer to eliminate the use conventional copper cables and also current carrying wires.

The single turn drive loop has an outer diameter of 305 mm while the transmit coil has a spiral shape with 6 1 turns an outer diameter of 580 mm and a pitch of 10 mm. Wireless power transfer wpt wireless power transmission wireless energy transmission wet or electromagnetic power transfer is the transmission of electrical energy without wires as a physical link. The nfc coil in the we wpcc wpt nfc enables data rates up to 848 kbps and the wpt coil allows wireless power transmission output up to 100 w at 20 v input voltage in one efficient solution. In a wireless power transmission system a transmitter device driven by electric power from a power source generates a time varying electromagnetic field which transmits power across space.

This project is built upon using a circuit which converts ac 230v 50hz to ac 12v high frequency hf. The human body is irradiated by the single sided wireless power transfer system operating at 6 8 mhz. Wireless charging designs work but the receiver must be positioned very accurately on the charging pad for efficient power transfer to actually take place. Standardized coils according to wireless power consortium wpc and other off the shelf components from 50 mw to 200 w are available.

To product portfolio of würth elektronik. Here we regard the single sided wireless power transfer system as the transmitter and it consists of a single turn drive loop and a high q transmit coil. The receiver rx coil for each application may have different geometries and or power requirements. Resonant wireless charging is much more forgiving of the receiver placement as long as the receiver is placed somewhere on the resonant wireless charging.

Since the rx coil is a key component in a successful and efficient design of a qi compliant rx and. The implementation of the wireless power consortium s wpc s qi standard1 brings wireless power to many dif ferent end applications. This paper presents a method for designing a high efficiency wpt system when. A design example is provided to optimize the size of a transmit coil for maximum range and wireless power efficiency to a 5 8cm receive coil used in a four element wireless power transfer system.