Nowadays, many people have more items in their daily necessities, that is, mobile power, also known as charging treasure. With the increasing variety of mobile electronic devices such as smart phones and tablet computers, and the increasing functions, charging treasures have become an indispensable tool for many people. But there are some charging treasures that should have brought us convenience. However, because of the quality and the problems, the consumers have brought a lot of hidden dangers and injuries. So, what is the quality of the charging treasures that are more and more commonly used? ?
The problem of the virtual standard of the charging power supply capacity is not even a secret inside the industry. Now, the virtual capacity of the charging treasure product on the market has become a common phenomenon.
CCTV exposure Xiaomi 5200 mAh mobile power capacity deviation rate of more than 50%, the news said that the foreign IEC62133 and UN UN38.3 dangerous goods transport standards and manuals.
Xiaomi said in his official website that the 5200 mAh charging treasure can fully charge Xiaomi 3, but Xiaomi 3 is only 3050 mAh. (If Xiaomi’s official statement is true, it is lower than the marked 5200, but it is higher than the CCTV, so is it considered a virtual standard?) Is it a conversion rate problem? Still another reason?
The General Administration of Quality Supervision, Inspection and Quarantine issued an appraisal report that failed "Millet Power" as a fake
As a 3C accessories practitioner, I have to stand up and say a few words for the sake of the industry. This time, CCTV is not reliable.
First, say a few words. The mobile power industry has a low threshold and low technical content, but the market space is large. At present, the mobile power supply on the market is uneven and muddy. It is an individual who can do mobile power. A casing, a circuit board and several batteries form a set of mobile power supplies.
At present, everyone in the media sees a lot of news about mobile power, today's mobile power virtual standard, tomorrow's mobile power explosion, then the mobile power industry is actually what is the status quo? What are the misunderstandings about mobile power?
first part
First of all, let’s talk about the capacity of mobile power.
Capacity is the number in front of the mAh that you usually see on the product packaging. For example, Xiaomi 10400mAh mobile power supply, product wins easy to charge four generations of 10000mAh mobile power. According to the shape of the battery core, the current battery for mobile power supply mainly has a cylindrical battery core represented by 18650 batteries, and a "polymer" electric package that everyone usually calls. ,
With 18650 and lithium polymer batteries, their own cell discharge voltage is 3.2V-4.2V. For calculation convenience, the average discharge voltage is 3.7V. For the four generations of 10000mAh, the energy of the mobile power supply is 3.7V*10Ah (10000mAh)=37Wh.
mAh is not a unit of energy. To know the amount of energy, you must know the current voltage. Many people think that the actual output capacity of the mobile power supply after boosting, used to divide the battery capacity, you can know how many times the phone can be charged. A simple analogy, mAh is similar to the unit "bowl", how much can be loaded, it depends on how big the bowl is. The same pot of rice, how many bowls can be loaded, you have to look at the size of the bowl. The public's misunderstanding about mAh is that they think the "bowls" are the same size.
The standard voltage for charging our mobile phone is 5V, but the voltage of the mobile power battery itself is not so high. To charge the mobile phone, it must be boosted to 5V. This boosting process is handled by the boost circuit in the mobile power supply. According to the law of conservation of energy, a 3.7V*10000mAh mobile power supply is outputted by a booster circuit at 5V, then the output capacity becomes 3.7V/5V*10000mAh=7400mAh. (Please note that the capacity is related to voltage!!!)
When the charging device inputs a charging voltage of 5V, it can be stepped down before it can be charged into the battery. In this process, the law of conservation of energy is still followed. For example, when the mobile power output is 5V1A, and then the device is stepped down to 3.7V, the current is 1A*5/3.7=1.35A.
The above calculations are all cases where the loss is not considered in an ideal state.
What factors affect the actual output energy?In the process of boosting the power supply, due to the consumption of the booster circuit itself, it is not possible to output 100% of the total energy, and this conversion rate is related to the output current. Usually, when the current of 1A is output, the conversion rate is higher than that of the 2A output. In the current mobile power supply on the market, the energy conversion rate is generally between 80% and 90%. 90% is a 98-point number.
What is the loss in the charging process of the charging device?
The current comes out of the USB output port of the mobile power source, passes through the data line, and then is processed by the internal charging circuit of the mobile phone, and then charged into the battery. In this process, due to the presence of wire resistance, the power consumption of the mobile phone charging circuit, and the charging efficiency of the mobile phone, a part of the power is consumed. This part of the power consumed is independent of the mobile power. And because different devices have different battery voltages, different charging methods, and different charging circuit consumption, the conversion efficiency naturally differs. The conversion efficiency of this part is generally around 80%. For example, the same mobile power supply, when charging the iPhone and a cottage, because the iPhone is better in circuit design, the iPhone can charge more power.
I really can't tell you how much capacity mobile power can charge your phone. But I give you a useful experience (not the law): According to the current general situation of mobile power and mobile phones, the mobile power battery capacity *0.65, you can probably get the mAh you can charge the phone.
Volkswagen does not understand the charging principle, do not understand what a mAh is a concept, do not understand the problem of loss of charging equipment, can not be said to nail the manufacturer on the board for moral criticism. This time, CCTV is consuming the ignorance of the people.
CCTV, enough!
1. Stealing the concept---Using the ignorance of the masses, confusing the mAh of the mobile power supply with the mAh of the mobile phone, ignoring the industry standards, ignoring science and technology
2. Recreational people---Using the public's natural distrust and weakness to the manufacturers, using public opinion to ignite.
3. The test results are not convincing----detecting the samples used in the cottage is suspected (about the cottage mobile power will be mentioned later)
The method of labeling capacity adopted by mobile power manufacturers is legal and reasonable, rigorous and scientific.
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