What is wireless charging? What are the benefits of a wireless charging setup?

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What is wireless charging? What are the benefits of a wireless charging setup? [Copy link]

Wireless charging technology (Wireless charging technology; Wireless charge technology), originated from wireless power transmission technology, can be divided into two types: low-power wireless charging and high-power wireless charging. Low-power wireless charging often uses electromagnetic induction, such as the Qi method for charging mobile phones, but ZTE's electric vehicle wireless charging method uses induction.

High-power wireless charging often uses resonance (most electric vehicles use this method to charge) to transmit energy from the power supply device (charger) to the power-consuming device. The device uses the received energy to charge the battery and also for its own operation.

Since the charger and the power-consuming device transmit energy through the magnetic field, and there is no need for wires to connect the two, the charger and the power-consuming device can be made without exposed conductive contacts. On September 19, Xiaomi mobile phones have long supported wireless charging, and the development is very fast. Previously, Xiaomi's sub-brand Redmi had never had this hardware feature. But the next Redmi new phone may make changes.

According to Weibo blogger @数码闲聊站, Redmi's new product is expected to support the new feature of wireless charging. The comments show that a large number of netizens may not want "wireless charging", but would rather have a metal frame, or a cheaper phone with a larger battery capacity.

It is learned that taking the Xiaomi 12S Ultra mobile phone as an example, it supports 67W wired second charging, 50W wireless second charging, and 10W wireless reverse charging. It is equipped with a 4800mAh battery, which can be charged to 40% in 15 minutes using wireless fast charging. In terms of battery life, in addition to normal system optimization, manufacturers have two options: increasing charging power and battery capacity. In the field of charging, iQOO has already brought 200W ultra-fast charging, and although the wireless charging function can only be limited to about 50W at most, it is also likely to be popularized.

Wireless charging is a technology that uses near-field induction or inductive coupling to transfer energy from a power supply device to a receiving device. No wire connection is required during the charging process, so it is called "wireless".

Wireless charging technology can be divided into four types: the first type is short-range transmission through electromagnetic induction, which is characterized by short transmission distance and relatively fixed usage location, but high energy efficiency and simple technology, making it very suitable for use as wireless charging technology.

The second type is to transmit electrical energy in the form of electromagnetic waves "radio frequency" or non-radiative resonance "magnetic resonance". The audio amplifier has high efficiency and very good flexibility, and is currently the development focus of the industry.

The third type is the "electric field coupling" method, which has the advantages of small size, low heat generation and high efficiency. The disadvantage is that it has fewer developers and supporters, which is not conducive to popularization.

The fourth type is to transmit electrical energy wirelessly in the form of microwaves - transmitting it to a remote receiving antenna, and then using it after rectification, modulation and other processing. Although this method has low energy efficiency, it is the most convenient to use. Intel is a supporter of this solution.

On September 19, Mobile China noticed that a digital blogger who had often leaked information about the configuration of unreleased new phones seemed to be hinting that future Redmi phones might be equipped with wireless charging. However, judging from the reactions of netizens, everyone did not seem to appreciate it very much. They all said that instead of adding wireless charging function to the phone, it would be better to bring back the metal middle frame and remove the plastic bracket of the screen. It seems that many people think that the wireless charging function is not very useful. Of course, this may not be because everyone does not want the wireless charging function, but they are dissatisfied with the metal middle frame and plastic bracket of the Redmi phone.

目前，Redmi似乎还未发布过带有无线充电功能的手机，而与Redmi有着显著不同的是，特殊功能放大器小米大量的旗舰手机都配备了无线充电功能，这似乎是官方有意将无线充电作为区别Redmi手机和小米手机的一个功能点。

What is wireless charging?

I believe many people know about wireless charging.

Wireless charging uses electromagnetic induction to power an increasing number of devices. The technology may not be entirely new, but its emergence as an option on smartphones has brought it new prominence. As more products ship with the feature, more users will want to know how the technology works.

Wireless charging is a technology that transmits power without using connectors or metal contacts as a medium. It is also called inductive charging, contactless charging, etc.

Since wireless charging technology does not require a power cord when charging, it can improve the safety, waterproofness, and dustproofness of device connectors. At the same time, since it has global standard specifications, one charger can be provided for use with various devices, and it is expected to be popularized more quickly in the future.

Advantages of wireless power

In the past, mobile devices were mostly charged with wired chargers or USB.

These are powered by wires that are plugged into a connector on the mobile device.

With wireless charging, you only need to place the mobile device on the charging stand to charge it.

Because no connector is required, the device’s waterproofness and reliability can be improved, and there is no problem of charging failure due to connector damage.

In addition, it is also possible to produce products with a strong sense of design.

If this charging stand can be popularized, various mobile devices can be charged anywhere without the need to carry equipment such as chargers or charging cables.

There are many ways to charge wirelessly, here are some representative ones.

吾妻思萌

Wireless charging is the conversion of electromagnetic induction magnetic field into electric field energy

xujian2000

Nowadays, people pay attention to the conversion efficiency of electric energy, which is beneficial to energy saving. Question: 1. Can the efficiency of wireless charging be compared with that of wired charging? 2. Is it more energy-saving or more energy-consuming? Suggestion: For mobile phones and other mobile appliances, it is advisable to consider increasing the capacity of the battery and reducing its power consumption for portable applications. Of course, the battery is researched and produced by professional factories, not the product of mobile phone manufacturers, but a component of mobile phones, so mobile phone manufacturers should choose to use it in conjunction with it.

eew_1PrAA0

The current wireless charging technology has a high efficiency in converting electrical energy, which is fundamental to energy conservation and consumption reduction.

秦天qintian0303

The most attractive thing about wireless charging technology is its convenience

book1

Wireless charging products (such as radio frequency cards) will have advantages only if the power consumption of electrical products is controlled within a few milliwatts or even a few microwatts. Otherwise, the efficiency is too low and goes against the principle of low carbon!

Wireless charging is definitely slower than wired charging. Excluding the time cost, the same battery can be fully charged using wireless charging and wired charging respectively, and then the data from the power meter can be read to see how much power has been consumed by each.