The speed of development of smart phones can be said to be very rapid, and it has become an indispensable digital product for everyone. Nowadays, mobile phones are no longer the feature phones that are only used to make calls and send text messages. Basically, we can use smart phones to complete our food, clothing, housing and transportation.
Everyone knows that in the era of feature phones used in the past, it was normal for mobile phones to stand by for more than ten days. At that time, we could use mobile phones without charging for one to two weeks, but the battery capacity of most smartphones is several times that of feature phones. Now users need to charge once or even twice a day when using mobile phones. .
So here comes the problem. At this stage, wireless charging technology has always been a trend in the development of future smart phones. It can only be used as a supplement to wired charging technology, precisely because its charging speed is really too slow, and it is very difficult to charge. The requirements are relatively high. Is wireless charging really superior to wired charging?
1. The working principle of mobile phone wireless charging
From small to large, we have been accustomed to holding the charger to plug it into the socket to charge the mobile phone or computer, thinking about the high voltage of 220V to transmit energy to the mobile phone or computer. For the concept of wireless charging in the past few years, it is negative, which means that it is a fantasy at all, but the working principle of wireless is not understood yet, and it gives us a charging function.
Wireless charging refers to a charger that does not use the traditional charging power cord to connect to the terminal device that needs to be charged. It adopts the latest wireless charging technology. By using the magnetic field generated between the coils, the magical transmission of electric energy, inductive coupling technology will become A bridge connecting charging base stations and equipment.
However, wireless charging equipment conducts energy to the charging terminal equipment, and the terminal equipment converts the received energy into electrical energy and stores it in the battery of the equipment. The principle of energy conduction is inductive coupling, which can ensure that there is no exposed conductive interface. It can save the messy transmission lines between devices, and it is safer for electronic devices such as electric toothbrushes that are often in contact with conductive media such as liquids.
Comment: Because of the huge space and high energy consumption of radio waves, they are less used. In fact, they used mine radios in the early days. The miniature high-efficiency receivers can receive radio waves transmitted in space. This technology has huge space loss, so Generally, it is only used on low-power electronic equipment, and the distance between the receiving device and the transmitting device cannot exceed a few meters.
2. Comparison of wireless charging and wired charging for mobile phones
Let us start with the charging time. The charging time of wireless charging and wired charging is different. They are calculated according to the requirements of the wireless charger design. For example, the charging time of the wireless charger cannot exceed the one of the wired charging. Hours, and the total time cannot exceed four hours.
When the same mobile phone is fully charged with wireless charging and wired charging, the charging time is obtained. The wired charging time is 110 minutes, and the constant current is 750mA. The process includes trickle charging, constant current charging and constant voltage charging. The wireless charging time is 150 minutes, the constant current is 560mA, and the whole process also includes trickle charging, constant current and constant voltage current.
It can be seen from this explanation that the comparison result analysis shows that the wireless charging time of the mobile phone is 150 minutes, which is 40 minutes longer than the wired charging time used on the mobile phone, and the total time does not exceed four hours. It is hard to imagine that it fully meets the requirements of the design.
Comment: The development of wired charging up to now, although no one says that the potential is exhausted, there are obvious limitations in development. In addition to the technology itself, more impacts come from other aspects, and the development of wireless charging has a history of more than ten years. , But the speed of development and application has not been smooth, but what is undeniable is the infinite charm displayed to people.
3.Which is better for wireless charging or wired charging?
Since the development of smart phones, wireless charging has planted grass in the author's mind. I have opposed wireless charging before. Since I started using wireless chargers, I have been inseparable from this charging method of charging and discharging. Sometimes I put one in the office. When I don’t use the mobile phone, I put it on and recharge it. It’s a bit more convenient than wired charging.
Of course, most companies rely on their own patented technology and self-developed system algorithms to achieve a separate design of induction coil and power circuit, low charging heat, and the temperature rise when charging mobile phones is only 5-10 degrees, which is significantly lower than the industry average. , Which fundamentally guarantees the safety of mobile phone charging.
In addition, the separation technology of charging makes it extremely slim, compact and portable. It can be used in the company during the day and at home at night. It does not take up any space on the table or bedside table, because there are indicators on the charging board and the data line interface. When working, The light will be bright, follow the soft light to put it up, the phone can be charged, and the light is very soft, and it does not affect sleep at all.
Comment: In short, this wireless charging method cannot be regarded as wireless in the strict sense, because it still needs to be in contact with the charger to complete the charging operation, and cannot be completely contactless like a wireless network, but this is not the same as traditional wired It is also very convenient to charge.
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