What is the principle of “fast charging”? What are the highlights and shortcomings of the current fast charging technology?

If you’re an iPhone 8, an iPhone X, an iPhone XS and an iPhone XR, using that old power adapter, the charging specifications are still 5W and the charging efficiency is extremely low.

However, not only the iPhone, but also the power adapter standard of the iPad has shrunk.

We listed the power adapters for the fast charging iPhone and the iPad Pro models.

In the case of the iPhone 8, the standard is a 5W power adapter, while Apple officially recommends a 30W power adapter that can give full play to the fast charging function. So if you want to use fast charging, you have to use a more powerful power adapter.

Is it significant to use fast charging?

How far is the difference between quick filling and no quick filling? Taking the newly launched XS Max as an example, we tested the charges from 0 to 100 using the original 5W and Apple’s official 30W power adapters, respectively. The results show that when charged for 10 minutes, the original 5W charger charged only 7% of the electricity, and the 30W charger charged 18%. By 30 minutes, the former charged 16%, while the latter soared to 50%. The former takes 3 hours and 43 minutes while the latter takes 2 hours and 20 minutes when both are fully charged.

From the statistical curve, we can see that although the total time difference between the two is only 1 hour and 20 minutes, in the first half of charging, the two are far apart. Especially in the first 45 minutes, using 30W power adapter can charge more than 70%, while using 5W power adapter can only charge less than 30%.

The greatest value of fast charging is not how long it takes to fill up the electricity, but exactly the first 30 minutes. In this era of not only reading fragmentation, but also charging fragmentation, the demand for high-speed charging in a short time is often higher.

Imagine that 30 minutes is just the time taken for boys to take a shower and change their clothes before they go out. 50% of the electricity is enough to be used calmly until they find the next time to charge. For girls, an hour of preparation before going out is indispensable, and 80% of the electricity is enough for a day.

So, how do we match the most suitable fast-charging scheme?

To answer this question, the first thing to be clear is what kind of fast charging protocol these devices are using.

As we all know, there are many kinds of fast charging protocols, so let’s not introduce them too much at first. One thing we only need to know is that all of Apple’s current products supporting fast charging support USB Power Deliver, which is what we often call the PD protocol.

What does this mean? That is to say, your Apple device power adapters are compatible. However, it should be noted that the compatibility here is limited to downward compatibility. Simply put, high-power power adapters can charge low-power devices, but low-power adapters can not charge high-power devices, otherwise there will be a very slow charging or even no charge.

At this time, I believe readers will ask another question: Will I charge such a small iPhone with an 89W power adapter explode?

The explosion is a bit exaggerated. I believe that the more worrying is whether it will affect the battery. Indeed, when lithium batteries are charged under or under voltage, they can cause damage to the batteries.

But in fact, the charging power of mobile phone is controlled by mobile phone. Regular power adapters will automatically regulate the charging power according to the instructions of mobile phone. Therefore, people do not need to worry about the damage of high-power power adapters to mobile phone batteries, and naturally they do not need to worry about explosion.

Having identified the above two questions, we can begin to consider how to match our own fast-charging solutions. Here, we might as well classify users in different situations.

First, if you own an Apple laptop as well as an iPhone or iPad Pro that supports fast charging. Congratulations, you just need a laptop power adapter to fast charge your iPhone or iPad Pro. But in addition to the power adapter, you still need to buy a USB-C to Lightning charging line (the latest iPad Pro users can use the original dual-ended USB-C line directly).

It should be noted here that some people may want to use the USB-A to USB-C adapter with the ordinary USB-A to Lightning line to save the cost of purchasing official USB-C to Lighting. This is actually not feasible, because even if you connect the charger and the mobile phone through the adapter, the agreement still does not match, it is still useless.

In addition, although Apple previously opened USB-C to Lightning’s MFI certification to third-party vendors, we did not see any third-party vendors’products on the market until the end of the draft due to the long period of audit and certification.

If you don’t have an Apple laptop, but you have an iPhone or an iPad Pro, you can buy a 30W power adapter and a USB-C to Lighting line, both of which can be fully charged. The only disadvantage is that it is expensive. The total cost of power adapter plus cable is 349 + 149 = 498 yuan.

Of course, if your iPad Pro is a new model, you can also use it directly with its 18W charger to charge the iPhone.

Speaking for so long, I believe everyone can see the problem. Most of the reasons that hinder the use of fast charging are that the price of an original power adapter and charging line that can satisfy the full charge of fast charging is too expensive.

However, in fact, in the choice of power adapters, it is not necessary to choose Apple’s official. Many lower-priced third-party power adapters that support the PD protocol can also fast charge Apple’s devices. In addition to lower prices, these third-party power adapters are even more versatile, such as the charging Hub, which now has a 100W output, allowing multiple different types of devices (such as MacBook + iPad, iPad + iPhone, etc.) to be fast-charged at the same time.

However, it should be noted that when choosing a third-party power adapter, it is important to choose a product with security certification and not pursue price blindly. Otherwise, it may affect the equipment itself or even have security risks. In addition, if you want to save money by choosing a third-party power adapter, you can also wait a little longer for a third-party transfer line with MFi certification to go public.

< strong > About Mac Laptop

In the end, I believe readers will ask again, what about the notebook? In fact, the power adapters on laptops are close to full charge, so there is no need to tangle.

However, it is worth mentioning that although all of them are dual-headed USB-C cables, the cables used for MacBook, MacBook Air and MacBook Pro are different. So if you have both or both of these devices in your office, you should be careful not to confuse them.

Is there any confusion about how to check? Here’s a little trick to teach you:___________

If the first three characters of the serial number are C4M or FL4, the line can be used with a 29W or 30W power adapter, that is, on MacBook and MacBook Air.

If the first three characters of the serial number are DLC or CTC, this line can be used with 61W or 87W power adapters, that is, on MacBook Pro.

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