Mobile power supply capacity is virtual mark here you will understand
Mobile power now has become a must-have smart phone users, but for the real situation of mobile power supply do you understand? Ask small make up for not long ago, there was a friend, he bought a 6000 mah mobile power supply, so-called conversion efficiency can reach 90%, but why iphone charging rechargeable dissatisfaction also have three times? The empty mark?
We know that the iphone 4 s battery capacity is 1460 mah, according to the most simple arithmetic, 6000 present 1460 material 4.11, that is to say, 6000 mah battery should be full of four times, but why is a far cry from actual situation?
Today, we talk about mobile power conversion efficiency. To briefly explain the charging principle of mobile power supply, the current mobile power supply using built-in batteries with polymer (18650), the nominal voltage of 3.7 V, and digital products such as mobile phone standard input voltage of 5 V. Therefore, mobile power need through the booster management board output 5 v to mobile devices such as charging. The actual power booster after conversion As shown in the above, according to the law of conservation of energy, a 6000 mah mobile power supply, battery energy is 6000 mah x 3.7 V = 3.7 Wh (tile), after booster into 5 V, the overall energy remains unchanged, but the quantity is 22 Wh present 5 V = 4400 mah, this is like a cup of 3.7 liters of water into 5 litres of cup. After the first step of transformation, the original 6000 mah power was only 74%, the 4400 mah is actually can supply mobile phone battery. Charging of various loss we have to do is to connect mobile power and mobile phones to charge with usb data cable, then the problem again, the 4400 ma whether can arrive all mobile phone battery? Of course, the answer is no, in the process of charging, the battery there are a lot of loss:
1, circuit switching loss. Believe we all know, mobile power supply at the time of charging will be fever, according to the law of conservation of energy, send out quantity of heat is also is a built-in battery energy.
2, the resistance loss. Charging for mobile phone, mobile power supply between the built-in battery and mobile phone battery is through the circuit boards and wire connection. We know that where there is resistance, no zero resistance of the conductor (superconductors to be outside the scope of this discussion). Resistance is the main physical characteristics of the electric energy into heat energy, therefore in the process of charging, the conductor will have heat generation, heat is produced will have energy dissipation and loss.
3, voltage loss. Lithium battery discharge voltage is not invariable, the safety of the discharge voltage range is 4.2 V to 4.2 V, the power conversion will have difference. General discharge voltage range between 3.6 3.9 V, can release the battery 80% or higher power, and if outside this range, power consumption will be increased.
4, power loss. Mobile power supply at the time of charging the mobile phone is not just to recharge the battery, to supply other parts, especially the screen is a major drain.
5, its operating loss. Charging process, mobile power supply to maintain their own operation also require electricity, the power also to supply by the built-in batteries. Through the above these losses, really reach the cell phone battery power is about 85% of the 4400 mah actual electricity, namely 3774 mah. From 6000 mah capacity batteries, to the actual power output of 3774 mah, which lost about 38% of the electricity. That is to say, the actual conversion efficiency is only 62% or so. Then I attach two pictures, tell everyone a 6000 mah mobile power supply, the electricity to my phone several times. 6000 mah mobile power supply actual number charge 6000 mah mobile power actual charging times Through the above explanation, I believe that everyone should understand the mobile power in practical application, the efficiency is not high. People usually buy mobile power supply, basic it is in this level, reach more than 90% of the part of the manufacturer. The author reviewed dozens of mobile power products, most of the conversion efficiency between 60% and 63%, occasionally encounter materials to work better, its conversion efficiency is 70%. After read this article, therefore, for the actual conversion efficiency of mobile power supply, everybody wants to have a clear understanding, let everybody can more in-depth understanding of the mobile power supply.
