Are there any development problems in the current wireless charger

- Jan 15, 2018 -

Are there any development problems in the current wireless charger?


First, radiation problems

Massachusetts Institute of Technology researchers say that the body has strong response to the electric field, but the body has little reaction to the magnetic field, so the system will not affect human health. However, this is only a speculations that researchers are worried about this view and need to be tested further before they are really applied to life.

As an electronic charge product, the charger itself can not avoid radiation, so it is necessary for the radio charger to have radiation. But the power of the wireless charger is very small, the charging time is long and the radiation is small.


Second, the problem of port disunity

In order to avoid unnecessary waste and produce more electronic waste, China is implementing a unified standardization of mobile charger ports. But for wireless charging technology, this point will get the most popularity: not only can mobile phones be used, but also digital cameras, iPhone and iPad, notebook can share this charging device. Fujitsu in Japan is even ready to launch a more advanced technology to expand the success from portable electronic products to electric cars.  The ultimate goal of Fujitsu Corporation is to set up a public "charging point" on the street, which can make the portable digital devices and electric vehicle users more convenient 24 hour all-weather charging service. In addition to this, wireless charger is more smart to save energy. Although the efficiency of the wireless charging device is about 70%, which is equal to that of the wired charging device, it has the function of full automatic shutdown and avoids unnecessary energy consumption. And this efficiency receiving rate is increasing.


Third, the charging standards are different

The cell phone will have a built-in charging receiver and a unified wireless charging standard

To achieve the wireless charging of cell phones and other products, there must be two parts: the transmitter is connected to the power supply, and is responsible for transmitting power to the wide space. The receiver is generally installed on the electronic products to receive electricity. Wireless charging technology has begun to be applied in mobile phone products. Taking iPhone mobile phone as an example, wireless charging manufacturers have adapted their wireless charging function so as to install a clothing similar to apple skin. As a wireless charging receiver, it appears in the form of increasing the charge shell of the mobile phone, but the related transformation products, China, will be available. The shell is called the "Qi door", which supports iPhone and blackberry, and users can experience this function without changing their mobile phones. At the beginning of 2013, the wireless charging receiver would be "thin" to become a built-in wireless charging receiver in mobile phone products, only as large as the nail cover. NOKIA, PHILPS, LG, Samsung, Sony Ericsson, iPhone, HTC, Google, ZTE, Sharp, RIM and many other world-famous mobile phone manufacturers are all supporting this technology. Wireless charger may also be bundled with mobile phone for sale.


Third, compatibility issues:

The key to mobile wireless charging lies in compatibility, and the Qi standard ensures brand compatibility

Wireless charging technology mainly uses electromagnetic technology to transform electric current into electromagnetic at transmitter, and mobile phone converts electromagnetic into current for mobile phone charging through built-in chip receiver.  The key to the popularization of wireless charging technology is to ensure that all manufacturers' wireless charger is compatible. The establishment of Qi Standard enables wireless charging to have unified technical specifications, and ensure the same charger's compatibility with multi brands and multi products. Menno Treffers, the chairman of the wireless charging alliance, said that the Qi wireless charging standard adopts electromagnetic induction technology. Compared with other technologies, it has higher efficiency and safety. Qi wireless charging standard, including the interface properties and regulations in three aspects, the popularity of wireless charging technology is a great challenge, so the Qi standard mobile phone will be available through any Qi certification through the charging station, base or other Rechargeable Wireless charging device. Qi's first requirement for devices is no more than 5 watts, which may be a limitation for some vendors hoping that laptop computers can also pass wireless charging technology.


Existing manufacturers have launched Qi standard wireless charging products, which are widely used in the market

The world's largest battery and portable lighting equipment manufacturers Energizer (ENR) said it will soon launch a wireless charger that supports the Qi standard, and the first for the new experience of apple iPhone3GS and blackberry Blackberry Curve 8900 wireless charging users. At the same time, the data from iSuppli, a market research company, shows that the market for wireless charging equipment will reach a scale of $14 billion in 2013. PHILPS has begun to produce a new type of mobile phone that contains wireless charging. The PHILPS X723 cell phone is already available, with a 3.2 inch 240X400 screen with GPS and a 3 million pixel camera.


Fourth, receiving antenna

Although the focus of this article is to introduce the charger, the receiving antenna is briefly introduced. Because this kind of wireless charging device is essentially a transformer, the primary is installed in the charger, and the secondary is installed in the terminal.

Because the receiving antenna that is not matched with the charger causes the fluctuation of the current in the charging circuit, how to choose the charging antenna well?

First: the terminal antenna needs magnetic shielding.

If the charging antenna is only a hollow coil, when the nearby metal objects are near, it will lead to eddy current, which makes the charging efficiency decrease, and the charger will not radiate, the current will increase and the charger will generate heat.

Second: the magnetic medium used for the charger is divided into two kinds: organic magnetic material and inorganic magnetic material.

Organic magnetic materials can be made very thin and warped, suitable for hand


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