Is there a wireless power transfer standard?

Wireless power transfer is based on the Wireless Power Consortium’s WPC 1.1 Standard (July 2012) that facilitates cross compatibility of compliant transmitters and receivers. The Standard defines the physical parameters and the communication protocol used in wireless power transfer.

The Wireless Power Consortium’s global standard for compatible wireless charging is called Qi (pronounced “chee”), The Qi standard guarantees that any device carrying the Qi logo will work with any charging surface that carries the Qi logo, regardless of manufacturer or brand. Qi allows design freedom, product differentiation, and guaranteed wireless charging interoperability.

 

How does wireless power technology work?

Wireless Power Transfer relies on magnetic induction between planar receiver and transmitter coils. Positioning the receiver coil over the transmitter coil causes magnetic coupling when the transmitter coil is driven. Flux couples into the secondary coil, which induces a voltage and current flows. The secondary voltage is rectified and transferred to the load, wirelessly. Wireless power transfer is usually controlled by two ICs: one transmits and another receives the transferred power, as shown in Fig 1.