No influence, the wireless charging using electromagnetic induction technology, the magnetic field transmission energy, the current from the charger coupled to the cell phone, for the battery, the charging process is not different from the cable charger. But the wireless charging distance is short and the stability is slightly worse.

The wireless charger is a charger that is connected to a charged terminal without a traditional charging power line. The latest wireless charging technology is used. The wireless charging technology has 20 patents in 2007. A variety of devices can use a charging base station, mobile phone, MP3 transmitter, electric tool and other power supply. The wired charging status of the adapter will not exist. By using the magnetic field generated by the coil and transmitting the electric energy miraculous, the inductively coupled technology will become a bridge connecting the charging base station and the equipment.

Most of the current chargers, such as iPod and iPhone, are charged through the direct contact of metal wires to the battery in the device. The advantage of wireless charging technology lies in its convenience and versatility. The disadvantage is that the efficiency is low and the power can only be provided. Apple's USB Dock connector not only provides power but also sync audio and video files to devices through USB interface.

However, wireless charging technology will bring progress to WiFi and battery technology. For devices that do not need data transmission, this new technology will greatly reduce the number of various kinds of chargers that users need. In addition, through the use of wireless charging technology, the public mobile device charging station will become a reality.

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Samsung's flagship machine has been carrying wireless charging for a long time, and Apple iPhone 8, after changing the back of the back of the glass, finally plans to add to this convenient charging method. According to Macotakara exposure, iPhone 8 is sure to add wireless charging, but the maximum charging power is only 7.5W, and there is a gap between the latest standards for the Qi wireless charging.

Because of the Note 7 recall, Samsung's new flagship has no significant improvement in charging speed, although the wireless charging on the S8 is in accordance with the QC2.0 fast charge protocol, the power is only about 10W - considering that the wireless charging should also consider the conversion rate, the actual speed is much slower than the 15W line. IPhone8 really uses 7.5W power to charge a little slower than Samsung, but the apple cell phone has a smaller battery, and the actual charging time should not be far behind.

For Android flagship, fast charging has become one of the most basic functions. However, its impact on battery life is still to be studied. iPhone is balanced in various performance, but very conservative in battery capacity and charging speed - even if system optimization is ideal for power control, the overall endurance is still hard to meet the needs of heavy users (and iPhone8 will also carry a 5.8-inch screen). The 7.5 watts of charging power is large to ensure wireless charging and cell phone safety, and Apple should also require a third party wireless charging seat to apply for MFi certification, which means that most of the Qi wireless charging devices on the market will not be suitable for the first time and iPhone 8.

It is worth mentioning that Apple's appeal is not a Samsung power ratio, and if iPhone 8 can add wireless charging, it is believed that domestic manufacturers will also be quick to follow, and it is good for the development of wireless charging technology. However, according to the urination of apple, the wireless charging base is impossible to give to users with iPhone 8, so you want to feel the charm of wireless charging, and you have to get your wallet in place in advance...

what is qi wireless charging？

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Since Apple's iPhone8/X was released last year, the wireless charging pad market has been a blowout. There is a view that when the user is used, the wireless charger will be the same as the WiFi, and it will be a user's need.

However, there are many wireless charging schemes on the market at present, and each has their own advantages and disadvantages. In addition, WPC recently released the latest Qi standard for v1.2.4 on its official website. In this context, which wireless charging scheme will eventually win?

Apple 7.5W wireless charging has been a mysterious and high-end existence. Although the current Qi wireless charging has been able to easily achieve 10W and 15W, apple 7.5W Qi wireless charging is all the time it is trying to attack. The main reason is that the wireless charging of apple 7.5W is a fixed frequency scheme that allows wireless charging to minimize the interference of the mobile phone.

Because of the technical barriers, the 7.5W wireless charging of apple, to some extent, represents the overall strength of the company, and the products are sold for a higher price. As far as the user experience is concerned, 7.5W is not as slow as 5W charging or 15W charging, and most Apple users who have no poor money will naturally choose 7.5W Qi wireless charging. But they don't know that most of the 7.5W wireless chargers that have been searched through Taobao do not support apple 7.5W. Obviously, smart businesses are better at playing word games. For 10W or 15W power wireless charger, they can not face the red heart, do not jump on the label, "support 7.5W wireless charging pad", and you can't pick out any problems.

Recently, WPC has released the latest version of v1.2.4 Qi standard on its website, this agreement will be enforced on March 8, 2018, which means that the wireless charging product certification on March 8, 2018, after Qi v1.2.3 will no longer apply, but according to Qi v1.2.4 standard certification.

With respect to Apple 7.5W transmitter authentication, compared to Qi v1.2.3, Qi v1.2.4 has the following updates:

1. the TX type MP-A11 is formally incorporated into the Qi standard at Qi v1.2.4. 2., under the version of Qi v1.2.3, the transmitter passed BPP+FOD Extensions authentication, while the newly released Qi v1.2.4 simplifies the authentication level of the transmitter, and it will be certified by EPP (MP-A11).

To sum up, after the new protocol is enforced, the type of Qi authentication that apple 7.5W launches need is EPP (MP-A11).

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Wireless charger refers to the charging power line connected to the traditional terminal equipment required for charging the charger, using a wireless charging technology, wireless charging technology has received 20 patents in 2007, a variety of equipment can use a charging base station, wireless charging technology is the use of electromagnetic induction principle, and send in the receiver to send and receive the corresponding coil induced current charging.

The advantages of wireless charging

1. security: no electricity connection design, can avoid the danger of electric shock.

2., durable: the power transmission element is not exposed so it will not be corroded by moisture and oxygen in the air. There will be no loss of contact and mechanical wear and jump when connecting and separating.

3., convenience: no need to connect wires when charging. As long as it is near the charger, no need to take up multiple power outlets, there is no trouble of winding wires.

Shortcomings of wireless charging

1., the efficiency is slightly low: there are transformers in the general chargers, but the transformer with wireless charging and transmitting coil and receiving coil is limited in structure so the efficiency of energy transmission will be slightly lower than that of the general chargers.

2. slow charging speed: due to the current mobile phone and other receiving equipment, most of the input power is limited, so the charging speed is slower.

3., the high cost: in the charger, there is a need to drive the coil of the electronic circuit, and the electronic device needs power conversion in the receiving device. Both of them need the coil, and the high-frequency filter circuit is needed to meet the electromagnetic compatibility, so the cost is higher than the direct charging.

Its principle is to use the magnetic field! Put in the similar to the transformer, a coil has a coil transmitting, receiving, coil parallel capacitor, the resonant frequency of the two coils are the same, the transmitter oscillator, amplifier circuit, switch circuit and the final stage, the pulse in the transmitting coil on the high frequency, when the receiving coil near will, induction current, and then through the rectifier filter circuit to charge the battery.

However, the efficiency can't reach 100%, and the transmission distance is also not far. Generally, it will not exceed 25 centimeters. The farther the efficiency is, the lower the efficiency is, and the efficiency will not exceed 50% at 5 centimeters. Some people say that the charger has a huge radiation, I think this view is wrong, and the power of a charger will not be more than 5W.

In fact, the electromagnetic induction this kind of thing is very common in our life, but we did not notice it, for example, we work on the bus, to swipe card is the principle, will have this coil generates a magnetic field in the card, the card when we close, there will be induction coil current, then the current rectifier filter to power supply chip card, chip sends a signal to the card clock process to complete a credit card.

how does wireless charging work？

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The dash cam, a black box of the car, prevents racketeers, confirms responsibility and records some funny things on the way. In fact, it also can be used as DV, because of especially compression format( such as H.264), so its effect is more excellent than a mobile phone is. Besides, it supports monitoring, especially infrared light.

From the view of the function, a lot of dual lens dash cam has a speed sensor that can be set. When the external impact is larger than the set value, current videos can be recorded and be used as evidence. Some good dash cam also has GPS to record the driving speed. And some high-end product also has image recognition that identifies marking lines on roads and provides features, such as yaw warnings on advanced cars. In addition, some products with motion detection can monitor. But its main function of the dash cam is to record the reliable and effective videos. 

By the way, LED by dash cam is useless, just think, the road can see clear under the headlight, could the smaller LED do that? If your front windshield isn’t clean, the stains illuminated will affect the night vision effect. It is useful to supplement light when it is used for indoor photography or short-distance recording. 

The dash cam consists of a lens, CMOS, chip, software, and others. CMOS is always designed into a common version with the chip(soc) after the manufacturers specify the model. In the same program, lens and software determine the final effect. In addition, the public version is often a more eclectic performance and cost, the factory can use the non-public version of the performance, not the use of a non-public version of the program to cut corners. As a result, the program became the key to the dash cam.

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