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What is a wireless charger?

2019-11-01

We main do in Laptop Adapter, Wireless Charger, USB Charger and Power Supply.


What is a wireless Charger?

The wireless charger refers to a charger that is connected to a terminal device that needs to be charged without a conventional charging power cord. The latest wireless charging technology is adopted, and by using the magnetic field generated between the coils, the magical transmission of electric energy, the inductive coupling technology will Become a bridge connecting charging base stations and devices.

Wireless charger features

1. In theory, wireless charging technology is harmless to human body safety. The resonant principle used in wireless charging is magnetic field resonance, which is transmitted only between coils that resonate at the same frequency, while other devices cannot accept the band. In addition, wireless charging technology The magnetic field used is itself harmless to the human body. However, wireless charging technology is a new type of charging technology. With the wireless charger of Maiyuan Technology, many people will worry that the wireless charging technology will appear just like the Wi-Fi and mobile antenna masts. In fact, the technology itself is harmless. .

2. The wireless charging technology uses magnetic resonance to transmit electrical energy between the electric field and the magnetic field between the charger and the device, and the coil and the capacitor form a resonance between the charger and the device.

3. This system can be widely used in the future, such as charging areas for electric vehicles and power transmission for computer chips. The charging system developed with this technology requires only one-fifth of the current charging time.

4. Conversion rate has always been a concern for many people. Research by the Massachusetts Institute of Technology shows that the loss of wireless charging technology is lower than that of wired charging technology. The wireless charging conversion rate is a few percentage points higher than the cable. High conversion is also a key factor in the global application of wireless chargers. However, wireless charging technology is also limited by distance. In the future, it is necessary to solve the problem of precise positioning of the long-distance transmission for the band and magnetic field range.

5, the core chip is one of the difficulties in the application of wireless charging technology. Precision radiation range control, magnetic field frequency, and other controls are all implemented by the chip.


What kind of material is good for wireless charger?

Currently, wireless chargers on the market are usually made of high-density plastic materials. It is also the best kind of material. Its plastic can be divided into ordinary grade, temperature grade, flame retardant grade, electroplating grade, etc. according to the application. Our common power adapters use the main plastics: PC, ABS and PC+ABS.


Wireless charger magnetic isolation material selection

The coil inside the single-coil free-position charging device has a drive that can move in a plane. It automatically detects the placement position of the terminal device, moves the coil to the position, and makes the position of the coil coincide with the receiving position of the terminal. This enables charging and improved charging efficiency. This type of design allows the terminal to be placed anywhere on the charging pad for charging. The Qi standard stipulates that the operating frequency of such a charger is 140 kHz. Since the coil needs to be moved, the magnetic spacer is required to have high reliability, so the magnetic spacer is generally applied with a flexible magnetic sheet produced by a casting process.

The multi-coil free-position charger can simultaneously charge multiple terminals, and internally arranges a plurality of coils that cover most of the area of the charging stand. Thereby, the terminal can be placed relatively freely on the charging stand, and the charger automatically selects several coils that can be efficiently transmitted to supply power. The Qi standard stipulates that the multi-coil free-position type charger operates at a frequency of 105 kHz to 113 kHz, and the magnetic isolation sheet is generally selected from MnZn power materials having high Bs and low loss characteristics.


Is the wireless charger charging as fast as a normal charger?

The charging speed of the wireless charger and the normal charger will be different. Moreover, according to different wireless charger manufacturers, the current and frequency are also different.

Causes of fever: It is because the current in the seat is large, resulting in significant heat. (The reason for the fever is that the rapid movement of the current of the electronic device is a sign that the overall molecular motion speed rises and the intensity of the molecular motion is increased. The temperature rises. 2. The transformer in the charger needs to convert the household voltage to 22V. The charging voltage of the mobile phone is 3.7V, 2.5V, etc. In this process, the transformer cannot completely convert the voltage, but waste some energy (which is why the transformer emits a weak sound and emits heat). The form of heat (and vibration) is released. So your charger and appliance will heat up.) At the same time, the temperature is high and the resistance is high, so the heat will increase the power consumption of the electronic equipment and slow down the charging speed to a certain extent.


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