Since the emergence of smart phones, the problem of electricity storage has always been its weakness.

When Nokia phones were popular ten years ago, it was not a problem that the phones could last for a week when they were fully charged.  But now, no matter which brand of smart phone, because of its diversified functions, it may almost run out of power after only half a day of continuous use.

Therefore, in today's society, which stresses more convenience and rapidity, charging at high frequency may be a headache for everyone, but what is more troubling is that the charging cable and plug are necessary to charge the mobile phone. Although these two items are not big, they always bring troubles to charging.

In fact, researchers have already discovered this business opportunity and invented wireless chargers that do not require charging wires and plugs.

Wireless charging technology, also known as inductive charging and non-contact charging, is a new charging technology originated from wireless power transmission technology.

Wireless charging technology uses near-field induction, and the wireless charger transfers energy to the equipment to be charged, which uses the received energy to charge the battery.

Since the wireless charger and charging equipment transmit energy through inductive coupling, no wire connection is required and no conductive contact can be exposed.

At present, there are three wireless charging methods: electromagnetic induction charging, magnetic resonance charging and radio wave charging.

Electromagnetic induction charging

Electromagnetic induction charging is currently the most common wireless charging solution.

The working principle of electromagnetic induction charging is that alternating current with a certain frequency exists in the primary coil, and current is generated in the secondary coil through electromagnetic induction, so that energy is transmitted from the output end to the receiving end to complete wireless charging.

Magnetic resonance charging

Magnetic resonance charging is a kind of wireless charging technology currently being studied, which has not yet been commercially available.

The wireless charger using magnetic resonance charging consists of an energy transmitting device and an energy receiving device.

When the two devices are located at the same frequency, resonance is caused, and energy can be exchanged with each other, so that energy is transmitted from the transmission end to the receiving end, and wireless charging is completed.

Radio wave charging

Radio wave charging is a mature wireless charging technology.

The wireless charger using radio wave charging consists of a microwave emitting device and a microwave receiving device, which can capture the radio wave energy rebounded from the wall and maintain a stable DC voltage while adjusting with the load.

This wireless charging method is more convenient, just install a transmitter at the wall plug and a receiver on low voltage products.