1.     Easy to heat up

2.     Short sensing distance

3.     Long charging time

4.     Low charging efficiency

Because the electromagnetic field interacts with the surrounding metal environment to generate electronic eddy currents and lose them in the form of heat energy, which wastes magnetic energy, weakens magnetic induction, shortens charging distance.

b. What is the Main Solution to Improve the Charging Efficiency of Wireless Charging and Ensure Its Safety and Why?

The main solution is to attach magnetic shielding materials to the back of the wireless charger transmitter and receiver coils.

Because It will provide a smooth magnetic path for the sympathetic electromagnetic field, which will increase the efficiency of wireless charging. And it will prevent the interaction between the sympathetic electromagnetic field and the surrounding metal environment from generating eddy currents, dissipating heat and wasting electrical energy, which will increase the sensing distance and save energy

c. What is the Requirements for the Magnetic Shielding Materials?

1.     Excellent magnetic properties

2.     High permeability

3.     Good flexibility, and will not be broken during bonding, otherwise it will cause magnetic leakage.

4.     Little magnetic loss in an AC magnetic field