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用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good)

2017-09-27 5页 doc 24KB 37阅读

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用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good)用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good) 用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good) At present, the most common types of mobile phone batteries are (Li-ion) lithium-ion batteries, lithium polymer u...
用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good)
用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good) 用万能充电器给手机电池充电好不好(Use a universal charger for mobile phone battery is good) At present, the most common types of mobile phone batteries are (Li-ion) lithium-ion batteries, lithium polymer ultra-thin batteries, NI-MH nickel metal hydride batteries. The battery threshold for different types of batteries (signs are full / full voltage) is different, in which lithium-ion batteries are divided into 3.7V/4.3V and 3.6V/4.2V. And the "universal mobile phone charger" on the market is said to be better compatible with (Li-on) lithium-ion batteries. The reporter interviewed some people in the field. They generally questioned: "universal mobile phone charger" and "constant circulation of constant charge standard, different rated capacity of the battery charging current, the maximum not more than 1C (C is the battery capacity is 500mAh and 1300mAh), the battery can be used as the current charge?" Of course, there are now more advanced fast charging methods (such as -DV/DT), with good compatibility. But in order to produce qualified products, you must use a dedicated chip and detection circuit, so that the total cost of the product is not 100 yuan, do not want to win. Those who sell tens of dollars (the actual cost is less than 10 yuan) of the "universal mobile phone charger uses what new technology can automatically provide suitable current and suitable threshold voltage depending on the battery, so as to achieve universal functions? It's really suspicious! ! Carefully studying the "universal mobile phone charger", we found that it has only two output lines, and we know that the designed charger has at least three lines of output. Two of the batteries are generally data feedback lines and temperature and alarm lines, most of the lithium-ion batteries have protective circuits inside, and even smart management chip. "Only two output lines" means that the charger gives up the protective circuitry that the battery itself has. Only in this way can we realize "cheap omnipotent"" Many of the chargers with low accuracy are designed to reduce the cut-off voltage (normal cut-off voltage is 4.2V). They set the threshold normal distribution value to around 4V. This makes the charging itself safe, but the battery is always full of discontent. This means that the battery capacity is reduced, resulting in an increase in charging times, and also resulting in a shortened battery life. Lithium ion battery is very fragile and sensitive. Lithium ion battery charge absorption efficiency is almost 100%, whether it is high current, overcharge or small current enough charge can lead to battery failure. Therefore, the battery threshold control is the key to charge control! The charging method is the best direct charger for mobile phone charging off - charge provides a constant DC voltage, then the mobile phone with a precision reference voltage source, and controlled by the software with the function of temperature compensation and the data exchange function of programmable large scale mobile phone power supply chip of a rechargeable battery, can achieve almost ideal effect. Many mobile phones can adjust voltage parameters precisely under the software engineering model, and the accuracy is up to 0.01V. These are the other way of charging charger is not easy to do, egg type charger should include direct perfect isolation, AC/DC conversion and voltage, the charger and charging monitoring all functions. So the cost of this egg charger is almost the sum of the two. The egg chargers are almost cheap!" Now more and more consumers have realized that the mobile phone 12~16 hours early charging is incorrect, this statement is to use the old nickel battery model. Lithium ion batteries are unnecessary and even harmful! This is because there are many advantages of lithium ion, but there is one of the most fatal shortcomings - very fragile! Therefore, almost all of the lithium-ion batteries are installed to prevent overcharge and discharge protection circuit (coarse protection, more accurate protection by the battery management circuit of power equipment). In addition, after the completion of lithium-ion battery production, there has been electricity, there is no activation problem. In order to reduce the capacity loss caused by the long storage time of the core, it is generally recommended to be used for the first time or for the first time after long-term storage. Full refers to the change of color after charging more than 20 to 50% of the time. For lithium ion batteries, better not be satisfied. Insufficient to cause a single input capacity to decrease, Flawed satiety may lead to unrecoverable. Obviously, due to the charging current sensitive lithium ion battery, the charging current can easily lead to excessive heating of the battery swell, active material shedding problem, "universal mobile phone charger can not provide different and suitable for different battery current. Then how to protect the security? Lithium ion battery for charging current, especially several threshold voltage charging requirements is very high, and now almost all the eggs are filled without the use of a precision voltage source (such as TL431 or similar functional units) and only the use of precision and temperature stability are very poor cheap Zener as a reference voltage source, resulting in threshold voltage dispersion a large, serious drift. In order to avoid accidents, many manufacturers intentionally reduce the threshold voltage to ensure that even if there is a relatively large positive error, there is no problem, causing the battery to be charged for a long time. The lack of intelligent testing of battery capacity is the most fatal flaw in what is known as the universal mobile charger. The charge current of the lithium-ion battery must be determined according to the size of the battery. The current is too small, resulting in a large extension of the charging time, the current over the assembly will lead to increased battery pressure, heating, damage to the structure, until the battery life. Lithium ion battery is very sensitive, accurate and stable threshold voltage control has great impact on battery life. The charger does not use the voltage reference circuit with sufficient precision, and because the design power margin is insufficient, the charger itself is easy to heat, which causes the threshold voltage to produce temperature drift, and affects the charging control accuracy. Universal charger in the 3.9V-4.34V (standard 4.2V should be) to the constant voltage charging for several hours, the charging current is not completely dead, and there is a larger leakage current. The lithium-ion battery charge current absorption is 100%, even a very small current, there are still charging problems. 5. all the original charger, in addition to the positive and negative poles of charging, there is also connected with the battery internal protection circuit to obtain the battery capacity, temperature compensation parameters, alarm protection and other information. And because manufacturers brand different, battery / mobile phone protection circuit circuit is very different. So it is almost impossible to achieve compatibility at this stage. One can imagine that such a cost of less than 10 yuan "universal mobile phone charger", how good security performance?
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