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Wireless charging is based on the principle of electromagnetic induction, which is similar to that of a transformer. There is a coil inside both a transmitter (such as a wireless charging pad) and a receiver (such as your phone). The coil int he transmitter is connected to the power to generate an electromagnetic signal, and the coil in the receiver induces the electromagnetic signal to generate an induced current to charge the battery. There are three ways to implement wireless charging technology: electromagnetic induction, magnetic resonance, and radio wave.

1. Electromagnetic induction

According to Faraday’s Law, an alternating current of certain frequency of the transmitter coil will cause an “induced” current within the receiver coil. In this way, electricity is transmitted to the battery. At present, this is the most common seen solution in the industry as well as the only one that’s able to be implemented in mass production.

2. Magnetic resonance

For this solution, an energy transmitting device and an energy receiving device are both set at the same working frequency to exchange energy according to magnetic resonance. But this technology currently still under research. The diameter of the coil used in the technical experiment is up to 50 cm, which apparently cannot be put into commercialization. Reducing the size of the coil will decrease the current in the receiving device to the level that does not meet the product standard. 

3. Radio wave

This is a relatively mature technology. This solution is mainly consist of a microwave transmitting device and a microwave receiving device. For this solution, the receiving device can be charged wireless by the transmitting device that’s attached on the wall.

In October 2018, HUAWEI launched its latest wireless charging pad CP60 with up to 15W fast charging capability. That means its charging speed can catch up with that of wired charging.

With HUAWEI’s 10V-4A adapter, CP60 is able to charge Mate20 pro with a maximum power of 15W. It is expected that the Mate20 Pro can be fully charged in 2.5 hours to 3 hours.

In accordance with Qi standard, CP60 is compatible with the mainstream flagship phones and earphones in the market, such as Apple iPhone, Samsung, and HUAWEI. It automatically identifies the device that’s being charged and provides the most matching current for the device, which ensures the charging safety.

CP60 is able to detect metal items, such as keys or coins, and stop charging automatically. It can also control the temperature within reasonable range to prevent from overheating and ensure safety when cards with metal insides, such as ID cards or credit cards, are mistakenly placed on the pad.

Precautions for wireless charging:

1. Wireless charging technology is based on the principle of electromagnetic induction. Do not place any object between your phone and charger. Otherwise, the charging performance may be affected. Magnetic objects placed between the phone and charger may even incur serious damage to magnetic stripes or RF-ID chip (usually built into credit cards, passports, and smart keys). If these objects are insides the phone case, take them out before charging.

2. Phone cases may affect wireless charging performance. If you find the charging speed is too slow, try removing such case before charging or use a phone case from HUAWEI instead.

3. Phone vibration (for example, when receiving notifications) may move itself away from working area, and stop the charging process. If this situation frequently occurs, you may try to turn off vibration function temporarily or turn on Do-N0t-Disturb mode.

4. There may be a slight noise when the wireless charging pad is charging your phone. This is a normal situation.

5. Your phone may heat up during charging. If overheated, the charging speed automatically slows down to prolong the battery lifespan. When the temperature drops down, the charging speed resumes to its former level. It’s suggested to charge your phone somewhere cooler to keep relatively low temperature.

6. When your phone is connected to a computer or power adapter with a USB cable, wireless charging will stop working immediately.

Source  - Huawei

1 comment:

  1. Thanks for the knowledge and information
    Username - @sanapalasrinu