Questions & Answers on Wireless Charging

Dec 14, 2016

In wireless charging, metal objects that get close to a wireless power transfer system may couple a portion of an electromagnetic field and heat up. The detection of foreign objects around the system (metallic or magnetic objects) is of key importance due to their ability to absorb energy from the wireless power supply field in the form of heat (parasitic heating) and possibly become a hazard.Simu...read more

What is the Qi Extended Power Profile?

Wireless Charging

Editorial Team

Nov 15, 2017

The Wireless Power Consortium (WPC) that manages the Qi specification has raised the maximum charging power from 5W to 15W. This 15 Watt power profile is called Qi Extended Power Profile. It enables devices to charge 3x faster as compared to the conventional Qi 5 Watt power profile.

At what frequency does Qi Wireless Charging work?

Wireless Charging

Editorial Team

Jan 5, 2017

Qi Wireless charging works at a frequency from80 kHz to 300 kHz. This is the frequency used for both power transfer and communication between the transmitter and receiver.

At what frequency does PMA (Power Matters Alliance) Wireless Charging work?

Wireless Charging

Editorial Team

Jan 4, 2017

Wireless charging using the PMA Standard works at 277 kHz to 357 kHz. This is the frequency used for both power transfer and communication between the transmitter and receiver.

What is Qi Wireless Charging?

Wireless Charging

Editorial Team

Dec 14, 2016

Qi - pronounced as 'CHEE' - is the international standard of wireless charging developed by Wireless Power Consortium for the Near-Field applications.It allows you to wirelessly charge a compatible device's battery by placing it on top of a wireless pad without the need for cables or adaptors.There are two fundamental technologies which have been used for wireless charging – Inductive Coupling and...read more

How Does Wireless Charging Work?

Wireless Charging

Editorial Team

Dec 10, 2016

Wireless charging is a technology to transmit electromagnetic energy through air to charge a device, without any connecting wires. In 1890, Nikola Tesla was the first to conclude that power could be transferred between two objects wirelessly via an electromagnetic field. He experimented with transmitting power using inductive coupling which is one of the technologies that is being used today.There...read more

At what frequency does Wireless Charging for the AirFuel Alliance Standard work?

Wireless Charging

Editorial Team

Jan 4, 2017

According to the AirFuel Alliance specification the wireless charging resonator system operates at 6.78 MHz ± 15 kHz. The AirFuel Alliance Specification can be downloaded here.

How much power can be wirelessly transferred using the Qi Standard?

Wireless Charging

Ashwini Mann

Jan 5, 2017

The Qi 1.0 and 1.1 Specifications used to support power transfers of up to 5 Watts. The latest Qi Specification, Version 1.2 supports the transfer of up to about 15 W.This answer has been taken from the Official Qi Specification Document - Click here to download the latest Qi Specification.

How much power can be wirelessly transferred using the AirFuel Alliance Standard?

Wireless Charging

Editorial Team

Jan 5, 2017

The AirFuel Alliance Specification allows the transfer of up to 50 watts of power. Devices using this standard can operate at a number of power levels based on the required application. Below is a table taken from the AirFuel Alliance specification document that shows the different power levels.Note: 6.5 W is intended to allow 5W at the charge port if the implementation has an efficiency greater t...read more

At what frequency does A4WP (Alliance for Wireless Power) Wireless Charging work?

Wireless Charging

Editorial Team

Jan 4, 2017

Wireless charging using the A4WP Standard works at 6.78 MHz. This is the frequency used for power transfer. However the A4WP standard uses the 2.4 GHz ISM band for communication between the transmitter and receiver.

What are the different Wireless Charging Standards?

Wireless Charging

Jeffrey

Oct 21, 2018

Qi Extended Power Profile, PMA (Power Maters Alliance), AFA (Air Fuel Alliance) and A4WP (Alliance for Wireless Power).

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