Wireless charging technology is not something new that has suddenly appeared in recent years. As early as the 1890s, Tesla, the father of AC, proposed this idea. He proposed that magnetic resonance can be used to transfer charge in the air between the power supply and the device. In 1891, he successfully lit up and did not connect. The light bulb of the wire proves that wireless power transmission is not a fantasy.
As a technology that can change people's lives, wireless charging technology has been valued by various manufacturers. Various wireless charging products have been introduced one after another. Electric toothbrushes, electric razors, mobile phones, and automobiles have all been available. The establishment of the three major technology alliances has accelerated the development of this technology and market. Hengrun Technology has a complete technical reserve in wireless charging, and has the ability to develop automotive products, and has reached a state of productization.
First, why do people need wireless charging?
Wireless charging advantages:
(1) Non-contact, no hard-wire connection, this may be the most attractive feature of wireless charging.
(2) Easy to operate.
(3) Applicable to special working conditions.
Wireless charging disadvantages:
(1) Higher cost and high maintenance costs.
(2) The energy consumption is high, and the farther the wireless transmission distance is, the more the loss is.
(3) The wireless charging technology device itself realizes the secondary energy conversion, and the voltage is reduced after being stepped down or converted to direct current, so the efficiency is poor.
Second, how to achieve wireless charging?
The simple principle of wireless charging is shown in the figure below:
Wireless charging is that the transmitting end (charger) and the receiving end (mobile phone, etc.) each have a coil, and the transmitting end converts the electric energy into an electromagnetic field through the transmitting coil, and the electromagnetic field of the transmitting coil passes through the receiving end coil, according to Faraday's law of electromagnetic induction, receiving An electromotive force is generated in the coil, and finally the electric energy is outputted to the mobile phone through the receiving end.
Third, wireless charging products
In fact, wireless charging has entered our lives, we can take a look:
Mobile phone
Watch
Configure wireless charging in the car to charge the phone
Charge your car with wireless charging
Fourth, wireless charging prospects
Wireless charging can be said to have a broad market space, popularity or wifi.
As a branch of consumer electronics, mobile phones are at the forefront of the wireless charging revolution, followed by the huge consumer electronics market and the electric vehicle market, which includes most of the built-in batteries and products that need to be powered.
Recently, Tesla has set off a wave of new energy vehicles and electric vehicles around the world. Its technological breakthrough has made electric vehicles more practical and closer to our lives. The global new energy vehicles and electric vehicles also show a high-speed growth trend.
Whether it's consumer electronics or electric cars, these products have one thing in common – they all require uninterrupted power. The transformation of the power supply method led by mobile phones is bound to affect these industries step by step.
In 2005, BYD applied for a patent for a non-contact inductive charger; in 2010, Dell showed a computer without a power cord; in 2012, the University of Utah fully charged a 40-foot pure electric bus with a WAVE wireless charging pad in a few minutes. In 2013, Nokia wireless charging docks charged Reddit electric toothbrushes; in 2014 Tesla began to get involved in wireless charging... Wireless charging technology is spurring the consumer electronics and electric vehicles market a little bit.
Although such a large-volume market cannot be completely replaced in a short period of time, just as wireless networks replaced wired, mobile phones replaced fixed-line phones, and touch screens replaced buttons, technological advances could not be stopped. With the passage of time, two years, three years, five years and ten years, wireless charging technology will inevitably follow in life and everywhere.
Fifth, the resistance of wireless charging promotion
1, the charging distance is short
The wireless charging technologies that have been applied so far, "electromagnetic induction" and "electric field coupling" are limited to the centimeter-scale distance, while the slightly farther magnetic resonance technology is only just reaching the level of the meter, and there are still many obstacles in technology. .
Take the Lumia series from Nokia as an example. Due to the limitation of the charging distance, the user must attach the mobile phone tightly to the wireless charging board to achieve charging, which requires the user to accurately "locate" the mobile phone on the charging board instead of the imaginary one. throw".
Therefore, the limitation of distance leads to the inability of many beautiful images to be realized. For example, if you hold the mobile phone on your hand and brush it on the microblog, you can charge it to the phone. When you go there, you can charge it. If you want to get rid of the charging cable behind the phone. The small tail, the breakthrough in charging distance is the urgent task of major companies.
2, low conversion efficiency
Due to the addition of two energy conversion links, the cumulative effect of conversion efficiency is caused, which lowers the overall efficiency; in addition, the heat generated by the loss of power is also an issue that cannot be underestimated. If the heat is too large, it will not only make the user feel hot when picking up the phone from the charging board, but the safety problem is even more critical.
3, susceptible to interference and radiation
Not only the posture, charging distance, etc. will bring discounts to the actual use of wireless charging, but more factors that we have not yet detected are silently interfering with wireless charging, just like we use in daily life. The same as the wireless network.
In addition, people will raise some questions from a health perspective, just like genetically modified foods. In fact, the radiation from wireless charging is not enough to cause any health problems in the current scientific literature, or at least the scientists have not yet given qualitative conclusions. But people are always wary of this invisible but actually existing thing, which on the other hand also hinders the promotion of wireless charging.
in conclusion:
The development of anything needs to go through a period of latent to eruption. If we follow the trend of technological development, we can make our own contribution to science and technology and enable people to enjoy the progress brought by new technology earlier.
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