The radiation of the wireless charger is calculated by taking a lithium battery with a capacity of 1000mAh as an example. 50% charging capacity is about 1.7~1.8Wh. If it is required to be fully charged in about two hours, the maximum charging power must be at least 1W (the maximum power of a GSM900 mobile phone is about 2W). Since the wireless charging method of mobile phones is to place the mobile phone above the charger instead of inside, the radiation leakage rate may not be small.

At present, some special mobile phones can be charged with wireless chargers, but according to the current technology, the charging efficiency is not comparable to that of wired chargers, and the technology of many wireless chargers is immature, and charging the mobile phone will make the mobile phone abnormal. fever.

Is the radiation value of wireless chargers really greater than that of mobile phones? The staff at Dajiaoting Store, a business hall of Beijing Telecom, tested this. The staff took out a high-sensitivity radiation tester. The instrument can measure the radiation value of mobile phones and other items, and can also sense the degree of electromagnetic pollution in the surrounding environment. The higher the value, the more serious the radiation.

The wireless charger is connected to the power supply, and the instrument test window is placed. The value increases to 150 to 180. The increment is not obvious, but it proves that there is radiation.

The next test is the mobile phone. I made a call with the Samsung mobile phone i579 of the staff in the business hall. The radiation value reached 427 at the moment of connection, and it was about 200 after connection. Then I placed the Sharp SH8010C in the test window to make a call, and the value soared to 2000 at the moment of connection. The value floats around 1000.

According to the “Electromagnetic Radiation Protection Regulations”, the average specific absorption rate (SAR) of the whole body for any 6 minutes in a day and 24 hours for ordinary users should be less than 0.02W/kg. But at present, there is no standard specifically for wireless charging.

He Guili, the director of the Tel Laboratory of the Telecommunications Research Institute of the Ministry of Industry and Information Technology, said that it is inevitable that the wireless charger will emit radiation, but since it has been listed, it means that it must meet international standards and will not cause harm to the human body. “As long as the wireless charger is done in accordance with the technical specifications, it will not have radiation hazards to the human body.” He Guili said.

It can be seen that the rumors on the Internet are not true. Nowadays, people are more and more concerned about their own health, so they are also paying more and more attention to the radiation problem of electronic equipment. The wireless charging technology is realized by the principle of electromagnetic induction. Although it will also generate radiation, it will not cause harm to the human body.

Yes, but very little, similar to WiFi and Bluetooth.

Compulsory certification means that all electronic products that are compulsory products must obtain KC Mark certification before they can be sold in the Korean market. They need to undergo factory inspections and product sampling tests every year.

Self-regulatory (voluntary) certification means that all electronic products that are voluntary products only need to be tested to obtain a certificate, and do not need to undergo factory inspection. The certificate is valid for 5 years.

KC EMC and RF:

KC EMC and KC RF certification includes electromagnetic compatibility testing, radio frequency and telecommunication testing. According to the latest “Radio Wave Law Chapter 58-2” requirements, the certification system is divided into three categories according to the different levels of products harmful to the radio environment: Certification of Conformity, Registration of Compatibility, Temporary Interim of Conformity.

KC certification information:

When applying for a new application, the certification process generally includes the following:

(1) Application form: Application for electrical appliance safety certification (mandatory product), electrical appliance self-discipline safety confirmation application and electrical appliance

Self-discipline safety confirmation statement for appliances (self-discipline products);

(2) Model differences (applicable to multiple models)

(3) Circuit schematic and PCB LAYOUT

(4) List of key originals and relevant certification certificates

(5) Transformer and Inductor Specifications (English)

(6) Product frame diagram

(7) Power of Attorney

(8) ID number application form

(9)Marking Label

(10) Product manual (Korean)

If a product is produced by several independent factories, although the product is the same model, several factories should obtain the certification mark at the same time.

Qi. Overseas manufacturers can apply directly or authorize local Korean agencies and representative manufacturers to apply.

Factory inspection requirements:

The Korean safety law stipulates that after accepting the application, the authorized person needs to conduct the first factory inspection of the factory.

According to the requirements of the safety law, a preliminary assessment of the factory’s quality control system is carried out, which involves the following aspects:

The factory shall produce the same samples as confirmed by the certification body in accordance with the requirements of product certification implementation regulations and factory quality assurance capabilities.

To the certified product. According to the laws related to safety certification in Korea and the relevant regulations of the Korea Industrial Technology Laboratory (KTL), your

The factory shall have the following documented procedures or regulations, the content of which shall be compatible with factory quality management and product quality control:

1) Product Change Control Procedure

(Example: After the certification product change declaration is approved by the certification body, the relevant department should formulate in strict accordance with the approved changes.

Corresponding technical documents are issued to relevant departments to properly implement changes to certified products. Unapproved changes cannot be made in the

Apply the certification mark on the product. )

2) Document and data control procedures

3) Quality record control procedures {should include record retention period of at least 3 years (only incoming, routine and operational inspection records)}

4) Routine inspection and confirmation inspection procedures

5) Non-conforming product control procedures

6) Inspection or verification procedures for critical components and materials

7) Internal quality audit procedures

8) Process operation instructions, inspection standards, equipment operating procedures, management systems and other procedures

The factory shall keep at least the following quality records to confirm that the factory has indeed carried out all production inspections and production tests,

Quality records should be authentic and valid:

Shenzhen Jinglian testing and handling!

3. Materials required for wireless charging KC certification

1) Wireless charging 3-5 samples

2) Battery pack samples

3) If CB test report is required

4) Factory ISO900 certificate

Special reminder: KC certificate holders can only be local Korean importers or manufacturers

Four, KC certification flow

1) Certification application (mandatory), declaration application (self-discipline);

2) Document acceptance and review:

3) Test (safety, EMC);

4) Evaluation and approval;

5) Legal certification (mandatory), issuance of certificates (self-discipline).

The principle of wireless charging coil is to use electromagnetic wave induction and related communication induction technology, and use corresponding coils at the sending and receiving ends to send and receive inductive communication signals for charging, as long as the host with the coil receiving the signal can be completed. Wireless charging, single-layer fine hollow coil, mostly used for short-wave and medium-wave circuits. If the wire is thicker and the single-layer fine air-core coil with a smaller coil diameter can be wound without a bobbin, the multi-layer fine air-core coil can obtain a relatively large inductance, but the volume is large and the distributed capacitance is also large. In general, the inductance of the single-layer fine hollow wire of the wireless charging coil is small. If you want to reduce the coil size and get more inductance, you can consider choosing an inductance coil with a magnetic core structure.

What are the principle forms of wireless charging coils? Now there are three main forms of wireless charging: 1. Electromagnetic induction wireless charging 2. Magnetic field resonance wireless charging 3. Radio wave wireless charging. Because the loss of wireless charging in the transmission process is relative to wired charging Large, and with the increase of the interval, the loss will be greater, so in the current commercial cases, various types of wireless charging coils are used in different wireless charging products. The wireless charging coil produced by Jinhaode Technology uses common magnetic material technology and process technology, and uses a unique metal soft magnetic sheet. It not only has the “thin” and “light” characteristics of the coil unit, but also ensures the original impact resistance, which has a great advantage in reliability.

Which brand of wireless charger is good

1. NetEase Smart Manufacturing

Over-temperature protection, over-voltage protection, short-circuit protection, foreign object detection, these safety functions are fully equipped. The base and body have anti-skid facilities, and the Qi protocol supports wireless charging of all models. NetEase’s breathing light is a flashing green halo, which is cool. At the same time, there is a certain reminder function, when charging, the slow breathing light. If something is placed on it and it is not charged, it is a rapid breathing light.

2. Xiaomi

The appearance of the charger is a black frosted plastic material, which is simple and beautiful. At the same time, the frosting also gives the mobile phone greater friction. The base is also a full circle of anti-slip rings, which is very slip-resistant. Double charging coils, the recognizable range is very large, and the vertical percentage can be charged. Horizontally, the center is offset a lot, and it can also be charged. Foreign object detection, overvoltage protection, these basic functions are also available.

3. Xiaomi wireless power bank

As a power bank, the capacity is 10,000 mAh, and both wired and wireless outputs support up to 30W. Input 18W, support a variety of fast charging protocols, can fast charge most devices by wired, wireless charging supports all devices, and Xiaomi devices support wireless fast charging. As a wireless charger, the charging protocol is universal and can be charged. Xiaomi’s mobile phone supports wireless fast charging. If you need both wireless charging and a power bank, you can choose this.

4. Netease strictly selected

This creative product from NetEase is essentially a mobile phone stand, but it has a wireless charging function. Height can be extended and lowered, front and rear can be adjusted. But this one does not support the 12 Pro Max, and the rest of the iPhones that can be charged wirelessly do. Available in black and white. This price is not high to choose.

5. PhoneMust

PhoneMust is a professional manufacturer of mobile phone wireless car chargers, wireless chargers with more than 18 years of experience, we are top leader of professional Wireless Charger manufacturers with well-equipped testing equipment and strong technical force.

The wireless charger list

1. Huawei

A world-renowned brand of mobile phones, smart devices, and communication equipment, Huawei is also the world’s leading provider of ICT (information and communication) infrastructure and smart terminals. A smart world where everything is connected.

2. Millet

Xiaomi was established in China in 2010, and its products cover mobile phones, home appliances, and smart terminals. “Let everyone enjoy the fun of technology” is Xiaomi’s vision. Xiaomi uses the Internet development model to develop products, uses the geek spirit to make products, and uses the Internet model to eliminate intermediate links. It is committed to allowing everyone in the world to enjoy high-quality technology products from China.

3. Samsung

Founded in 1938, Samsung is the largest multinational company in South Korea and one of the world’s top 500 companies. It involves many industries, including electronics, aviation, automobiles, finance, machinery, and chemistry. Currently, Samsung has 429 locations in 68 countries around the world and employs more than 230,000 people.

4. Momis

A well-known domestic protective cover brand and a well-known 3C accessories brand in China. Founded in 1999, it is affiliated to Momishi Technology Co., Ltd., a Hong Kong brand focusing on fashionable mobile phone peripheral products, a famous brand of mobile technology products in Hong Kong and Macao, the most dynamic and dazzling mobile phone. One of the digital product accessories brands, the winner of the German Red Dot Award.

5. PhoneMust

Shenzhen PhoneMust Technology Co., Ltd. is a high-tech company dedicated to the development of high-end smartphones, smartphone peripherals, and smart applications. The company was established in Shenzhen, Guangdong in May 2010. It has a mature software and hardware development team and rich experience in mobile Internet products.

1. Does the Apple wireless charger damage the battery?

Does not hurt, Apple wireless charger does not hurt the battery. The principle of the wireless charger is electromagnetic induction, the charger generates a magnetic field through the current, and the mobile phone generates a current through the magnetic field induction to charge the mobile phone, so the Apple wireless charger will not cause damage to the battery.

2. the advantages and disadvantages of Apple wireless charger

Pros of Apple Wireless Charger:

1. Abandon the shackles of the charging cable

Using a wireless charger can get rid of the shackles of the charging cable, avoid the repeated plugging and unplugging of the charging cable, reduce the loss of the mobile phone, and prolong the life of the mobile phone; the phenomenon of cluttered wires on the desk will also disappear. In addition, after getting rid of the shackles of the charging cable, the charging of the mobile phone is more convenient, and there is no need to hold the mobile phone in one hand and the charging cable in the other, and charge it immediately. For fruit fans, they must have some understanding of the original charging cable of Apple mobile phone. Its interface is the most easily damaged, and the cost of an original charging cable is also hundreds of yuan, which greatly increases the cost of use.

2. It can be charged as soon as it is released, and the charging time is fragmented.

As long as the office worker is not very busy at work, in most cases, the time of using the computer in the office is longer than that of the mobile phone. When working, you can put the mobile phone on the wireless charger to charge. If you need to use the mobile phone in an emergency, you can easily pick it up. No need to plug and unplug the charging cable.

Disadvantages of Apple Wireless Charger:

1. Can’t “play while rushing”

At present, the wireless charging mobile phones basically belong to the Qi standard, that is, the magnetic induction wireless charging technology is used. Wireless charging looks convenient, but its maximum charging distance is only 10mm, while wired charging can be extended with a cable. In the case of iPhone X, when using wireless charging, the phone must be placed on the wireless charging panel. Wireless charging may abort as soon as the phone is moved. It may not have much influence on girls who love to chase dramas, but it is superfluous for boys in game parties. There are also certain restrictions on the mobile phone case, and a thick mobile phone case cannot be put on when charging.

2. The charging speed is not as fast as wire charging

In terms of charging speed, there is still a certain gap between wireless charging and wired charging. Experiments have shown that taking the iPhone X as an example, in the same environment, using a wireless charger with the same power and current to fully charge a battery with only 1% of the battery left is nearly half an hour slower than a wired charger. Greatly reduced work efficiency.

3. Elevated temperature affects battery life

The foreign media did a test, which is to charge the iPhone X by wired and wireless methods for fifteen minutes each, and then measure the body temperature of the two charging methods. The temperature of the iPhone X before wireless charging was measured and it was 28.1 degrees. After 15 minutes of wireless charging, the temperature of the iPhone X reached 37.8 degrees. This temperature is actually if the iPhone X is held in the hand. If so, you can clearly feel the heat of the fuselage. The results of wired charging are completely different. The temperature of the iPhone X before charging is 78.5°F, and the temperature of the iPhone X body after 15 minutes of wired charging is 84.0°F, which is much lower than the temperature of wireless charging. When using wireless charging, the body temperature of the iPhone X is relatively high. If wireless charging is used for a long time, it will have an irreversible impact on the battery life of the iPhone X, and the cost of replacing the battery will be a large expense. With wired charging, the temperature of the iPhone X’s body doesn’t change much, and the battery life isn’t much affected.

1. Which one is better, wireless charger or wired charging

Both wireless charging and wired charging have their own advantages and disadvantages. Wireless charging can be used when connected to headphones, etc., but it is more expensive and cannot be used during charging. The advantage of wired charging is that it is cheap and portable.

At present, the application of wired charging is very wide. It can be said that almost all electricity users are wired charging, and the prospects and limitations are also very bright. The power of large and small devices is insufficient, and charging is inconvenient, especially for large-scale electricity consumption. Equipment such as electric vehicles, etc., charging is really inconvenient and subject to many restrictions. Although wireless charging has many limitations and defects due to technical reasons, its application prospects are very promising, especially in ultra-long-distance power transmission (space power station plan) and sports power transmission (photovoltaic road) and so on. great development prospects.

2. How to use the wireless charger

1. Put the mobile phone with wireless charging function on the wireless charging board. The position should be well placed, and then it can be charged. Note that some wireless charging panels support different mobile phone models. You should choose the wireless charging panel according to your mobile phone model.

2. At present, long-distance charging is not supported. This technology may be achieved in the future. What is wireless charging technology? According to a report in the United States, a research institution has developed a long-distance wireless charger. This charger includes A transmitter with a plug, an electronic receiver, as long as the power is within a certain range, the power can be transmitted to the terminal equipment equipped with the receiver.

3. Wireless chargers use radio waves to transmit. Radio waves are not only electromagnetic waves, but they can also transmit energy and penetrate the air, thus making wireless power transmission possible.

Some phones that support wireless charging

However, judging from the current usage of consumers, there is a general problem of charging and heating. After the mobile phone is charged on the wireless charging stand for a period of time, the mobile phone will become very hot, even hot to the hand, and netizens are not happy, and they are instantly fried.

Netizens worry about wireless charging

So, if the temperature of the mobile phone really reaches 60 ℃, will it damage the battery? The answer is: there will be damage and shortened lifespan. We all know the characteristics of lithium-ion batteries. The operating temperature of lithium-ion batteries is generally 0-40 °C. If the battery is kept at a high temperature of 60 °C for a long time, the battery will be damaged.

However, why do some netizens report that their wireless chargers are not very hot and hot?

In fact, there are several fundamental reasons for the heating of wireless charging of mobile phones. After understanding the reasons, you can choose more suitable products and enjoy the fun of wireless charging with confidence:

1. The choice of method.

This is the most fundamental reason. Different methods have their own characteristics. For example, wireless charging methods such as NXP, IDT, Easy Charge, Xuxinsheng, etc., whether it is charging efficiency, mobile phone compatibility, or charging off, temperature control Other aspects are different. Some manufacturers will use some relatively cheap methods when considering the cost, abandoning some peripheral circuits and some functions, and getting what you pay for. This is why some products sell for several hundred yuan. Some are only a few dollars.

2. Temperature control circuit.

Generally, the wireless charging method will have a temperature control circuit and an NTC thermistor. This function is important to prevent the circuit from overheating during operation, burning components, etc., and can also control the appearance of power components. After too much heat, reduce the power, thereby reducing the temperature, this function is very important.

3. Selection of heating components.

The qi standard wireless charging originally used electromagnetic induction to generate current and drive the circuit to work. At the transmitting end, an LC oscillating circuit is formed by an inductor (coil), a resonant capacitor and a control chip. By oscillating in the frequency range of 110-205 kHz, a current will appear at the receiving end due to the changing magnetic field, so that the mobile phone can be charged. Therefore, if the appropriate components are not selected in the circuit, the error of each component will affect the overall performance, and excessive current consumption will cause excessive heat on the components.

4. The problem of the mobile phone

The battery protection temperature set by the systems of Apple, Samsung, Huawei, and Xiaomi are all different. During the operation of the mobile phone, the system detects the temperature from time to time. Once the temperature exceeds the set value, for example, it starts to reduce the CPU frequency, causing freezes. , or prompt a temperature alarm. The same is true for charging. For example, when the iPhone is charging wirelessly, when the temperature of the case is around 30°C, the system starts to reduce the power, and the Samsung mobile phone reduces the power at around 35°C (the parameters of the old and new models will vary). That’s why wireless charging with Samsung phones is slightly faster, but the phone feels a little warmer than Apple’s.

PhoneMust Wireless charger

Through the above analysis, everyone should know how to choose a suitable wireless charger. Although the current charging speed of wireless charging is not as fast as wired charging, it is still more convenient, especially for some business people, who use their mobile phones very frequently.

On June 7, 2007, the MIT research team published the research results on the website of the American “Science” magazine. The research team applied resonance to the transmission of electromagnetic waves and successfully “grabbed” the electromagnetic waves, using copper coils as electromagnetic resonators, one coil was attached to the side that transmits electricity, and the other group was receiving electricity. After the transmitter sends an electromagnetic wave of a certain frequency, the electromagnetic field spreads to the receiver, and the power is wirelessly conducted. The technology, which they call “wireless power,” has been tried and tested successfully to power a 60-watt light bulb two meters away. The farthest transmission distance of this technology is only 2.7 meters, but the researchers believe that the power source can already charge the battery within this range. And only one power supply needs to be installed to power the appliances in the entire house.

In February 2014, computer manufacturer Dell joined the A4WP camp. At that time, the relevant executives of the camp said that the technology would be upgraded to support wireless charging of ultrabooks from computer manufacturers such as Dell. Most of the traditional laptops on the market have more than 50 watts of power, but Ultrabooks use Intel’s low-power processors and will be the first laptops to use wireless charging. Prior to this, wireless charging technology has always been only related to “small” mobile devices such as smartphones and small-sized tablets. However, A4WP (“Wireless Power Alliance”), one of the three major wireless charging camps, recently announced that its technical standards have been upgraded, and the supported charging power has been increased to 50 watts, which means that high-power devices such as laptops and tablets can also be used. Enable wireless charging.

In October 2017, the mobile phone family that supports wireless charging has ushered in three new members: iPhone 8, iPhone 8 Plus and iPhone X – all of which support the Qi wireless charging standard, in order to bring users greater Convenient, and the phone itself looks cooler.

Which phones does the wireless charger support?

With the development of the times, the replacement of mobile phones has accelerated, and smart phones have become very smart. Even many brand mobile phones have begun to support wireless charging. For example, some well-known brands such as Apple, Samsung, Xiaomi, and Huawei support wireless charging. To find out whether your mobile phone supports wireless charging, and how much W wireless charging is supported. You can ask the mobile phone manufacturer when you buy a mobile phone, or check it yourself on the official website of the mobile phone.

The benefits of wireless phone charging:

One of the advantages of wireless chargers is to get rid of the shackles of various mobile phone data cables: put the wireless charger on the table, you can put your mobile phone on it to replenish the power in your spare time, and take it with you when you want to use it. to use. In this way, you can use the fragmented time to charge every day, and avoid the trouble of finding wired chargers everywhere.

The second advantage of wireless chargers is to make mobile phone charging more comfortable. Nowadays, mobile phone wireless charging is actually the most suitable charging method for mobile phone lithium batteries. Because the characteristics of lithium batteries themselves are suitable for charging and discharging, and the wireless charging power of mobile phones can reach 30W, which is relatively fast, so the charging speed is not slow, and it will not take too long to fully charge.

One of the biggest benefits of this three-in-one wireless charger design is that it can make our desktop more clean and tidy, allowing us to bid farewell to the cumbersome desktop. Once you needed a bunch of chargers, each product needed its own dedicated charger, and when they all need to be charged one day, then your desk is simply the scene of a major disaster, all kinds of data cables, all kinds of chargers make it easy. People are powerless, and most chargers are very slow to charge, so that most of your time is wasted waiting for charging. Now, with this three-in-one wireless charger designed to charge three times in one machine, you can imagine a simple wireless life, and a more efficient charging method saves you more time.

As for its appearance design, it is of course very in line with its concept of pursuing a minimalist life. The simple design is matched with the delicate appearance, which instantly improves the style of your desktop by several grades, and it also has an independent coil, which can convert the Efficiency increased to 90%.