Make your life easier with RenhotecIC QI wireless charger

 

Wireless charging has been in the field of mobile phones for a long time. It has been nine years since the first commercial wireless charging devices for mobile phones, PalmPre and Touchstone, were launched. The heroes who are familiar and popularized by the majority of users should be Samsung's S6 and Apple's iPhone8. The former made the industry discuss the feasibility of using wireless charging for mobile devices, and the latter made wireless charging popular. And the alliance behind this is the WPC wireless charging alliance. The Qi standard protocol they promote makes wireless charging truly popular. Facing the hot wireless charging devices on the market, do you really understand wireless charging? Let's talk about this today.

 

Before we start, let’s introduce the WPC alliance. The WPC (Wireless Power Consortium) alliance was established at the end of 2008. It launched the Qi wireless charging standard, which solved the problem of "universal" wireless charging and made this technology widely used in other industries. possible. The Qi standard is based on the principle of electromagnetic induction, and its electromagnetic wave frequency is between 10 and 205kHz, which is more suitable for short-distance wireless charging, and is characterized by strong compatibility and high transmission efficiency. At present, this standard is adopted by most wireless charging products on the market, and it is also the most familiar wireless charging technology for the public.

 

What kinds of wireless charging are there?

 

There are mainly four ways of wireless charging. At present, only one type has been commercialized, and the other three types have not been popularized on a large scale.

 

1. Electromagnetic induction wireless charging

 

This method uses the induced magnetic flux generated between the built-in induction magnets of the power supply side and the power receiver, and converts magnetic force into electric power for wireless transmission. The advantage is that the circuit structure required by the equipment is relatively simple, the charging equipment can be miniaturized, the cost is low, and the charging efficiency is relatively high. The disadvantage is that the transmission distance is short, improper placement or movement will affect the power supply. This is the Qi standard launched by the WPC Alliance, which is supported by most manufacturers and users in the world. At present, most of the transmission methods you can see are basically this. The mobile phone comes with a wireless charging sensor module, and a charging board costs only tens of hundreds of dollars. The popularization of wireless charging is the credit of this wireless charging method.

 

2. Magnetic field resonance wireless charging

 

In this method, the resonators at both ends of the power supply and the power receiver are used to generate magnetic field resonance, and the magnetic force is converted into electric power for wireless transmission. As long as two devices oscillate at the same frequency, they can exchange energy. Its biggest advantage is that it can be transmitted over a long distance, but due to its low efficiency, it only exists in the laboratory at present, and it is far from the possibility of reaching the supply market. As long as the efficiency problem is solved, I believe that this method will become the wireless charging experience that people prefer. Think about it, in a room, with a wireless charging transmitter, you can walk around the room with the device, and the battery of the mobile phone is always sufficient. Isn't it beautiful?

 

3. Radio wave charging

 

In this way, by configuring radio wave transmitting equipment on the power supply side and radio wave receiving equipment on the power receiving side, power transmission is performed with DC voltage output and input. Its advantage is that the transmission interval does not need to be too close and the transmission speed is fast, but the stability and security are relatively low, and it is currently in the research and development stage. Both ends need to be connected by larger devices, and the output end is okay. If you have a device that is similar to a miniature power bank on your mobile phone, it is better to use the power bank directly.

 

4. Electric field coupling wireless charging

 

The advantages of this method are many, and the principle is that the electric power is transmitted through the induced electric field generated by coupling two sets of asymmetric dipoles in the vertical direction (is it a mouthful?). The electric field coupled wireless charging is very suitable for short-distance charging, the conversion efficiency is also high, and the position can not be fixed. It sounds really good, but the disadvantage is that the equipment is larger and the power has a corresponding bottleneck, so it is basically lying in the laboratory. No commercialization.

 

Like the advantages of wireless charging

 

1. Unplugging without wires can keep the desktop clean and reduce the impact of plugging and unplugging operations on mobile phone ports.

 

2. Good versatility, all devices can share a wireless charging board, and the wireless charging treasure is not affected by the interface.

 

3. You can use bluetooth to answer while charging, in the eyes of some people, this can reduce radiation.

 

4. The charging board can be integrated into some other objects, which saves space and is very convenient, such as mouse pads and bedside tables.

 

What Holds Back Wireless Charging

 

Although the current Qi standard has the lowest cost, it is relatively restrictive, so many people find it useless. In fact, it is much better than the other three.

 

1. The charging speed is slow. At present, there is no good technology that can effectively solve the problem of energy loss. 5W/7.5W/10W are the current three power levels, which are much slower than wired fast charging. It may take an iPhone 11 Max to fully charge with 10W Close to four hours.

 

2. High fever. Due to technical reasons, part of the electric energy will be converted into heat energy. Even the best charging pad can feel a significant temperature increase after being charged for a long time. The charging pad and mobile phone are the same.

 

3. Unable to hold. This is fatal to mobile phone users. Without a mobile phone in their hands, it is the end of the world; gamers cannot enjoy the benefits of wireless charging. Not only can they not be handheld, but the super high power consumption and slow charging speed are irreconcilable contradictions. .

 

Even though wireless charging, especially the currently popular Qi standard has such and such shortcomings, it is undeniable that wireless charging has entered the lives of ordinary people. As the number of mobile phones equipped with wireless charging functions continues to increase, As well as the increase in the power of wireless charging itself, wireless charging will gradually replace the current wired charging, just like today's Bluetooth headsets are gradually replacing wired headsets.