Undoubtedly, when people choose the power bank, in addition to considering the safe, the capacity (Mah) is also an important standard. In terms of the fresh consumers, the conversion rate of power bank is another important standard they should not ignore. The conversion rate of energy always exists in the conversion process of it which including electrical energy, heat energy ETC. In terms of power bank, To some extent, the conversion rate is a key index that reflects the quality. But three factors impact on power bank conversion rate: batteries quality, design of whole circuit board and loading devices. Each factor will cause different power loss, and get to about 14-25% total. In the current application of power bank comprehensive technology, take normal mobile phone as an example, the final conversion rate may be only about 75%-86% from the saturated power bank to the devices that are charged. We are to analyze power bank loss from the following three factors. Battery quality Batteries are the core components of power bank, and resistance exists in the internal battery. We all know the bigger resistance, the more consumption. During the lithium battery working, we call the resistance of current through internal battery as internal resistance which is distinguished into ohm internal resistance and polarization resistance. The better battery, the lower internal resistance. If the internal resistance is higher, the self-discharge would be higher and discharge capability would be lower, which will lead to low discharge of power voltage, low frequency of discharge and short life of battery. Generally, if use the batteries of different internal resistance in combination, which will reduce the working effective, shorten the working life and lead to higher consumption. The whole circuit board design Taking the lithium battery voltage is 3.7V and the output voltage of power bank is 5V as an example, it needs a boost pressure process to make power bank voltage up to 5V, so that it can output current. What can drive boost pressure is a booster circuit whose core is the boost IC. Currently, the output conversion rate from output current of lithium battery to the output IC can be up to 96%, which is related to the boost IC quality, it can’t reach 96% if use the inferior IC. Nowadays, the mainstream IC is from Taiwan and Japan, the conversion rate of japan IC is higher than Taiwan. Normally, the high quality power bank adopts Japan IC for its intelligent control system. The efficiency of intelligent booster is higher than non-intelligent. Of course, the cost will be increased. The master boost IC, inductors, capacitors, diodes and other components, which of them constitute the booster circuit. From the boost IC to booster circuit, current exists energy consumption. Theoretically, the best booster circuit may ensure the conversion rate of lithium battery up to 90-92%. In the whole circuit board of power bank, the design and use of circuit protection is indispensable and important beside boost IC and booster circuit. A part of energy from lithium battery may be consumed by the components of circuit protection while operating. In addition, the current transmission efficiency mainly reflects the current consumption of cables conduction, which is related to the quality and length of cables, the longer cables, and the more consumption. If you use non-pure copper material, the consumption will be increased sharply. Take output 5 voltage of power bank as an example, after a series of consumption, its max output capacity only 85-90%. According to the principle and theory of power bank, and combines with the practical test that can find the higher conversion rate of whole circuit, the lower power bank heating, as the circuit energy consumption is less. It also makes us easier to learn about the quality conditions of power bank: The poor conversion rate usually causes the following potential problems: the power bank may heat too fast, over-heating, short circuit, burn and high temperature accelerates aging of components. Loading devices The devices are charged --loading devices which also exists the consumption. The different loading devices, the different conversion rate. Take IPAD as an example, the output current of power bank reaches the IPAD battery, in the process of electrical energy converting into IPAD battery energy storage, a part of energy will be consumed because of the internal charging circuit of IPAD. These consumption caused by the declining voltage, limiting current and is related to IPAD that can’t be changed. The practical received energy is about 90% of power bank output. Therefore, about the consumption of conversion rate caused by loading devices, the different devices, the different conversion rate. In conclusion, the first and second aspects which describe the power bank as a body, While the third is directly related to the loading devices. Many companies usually regard the whole circuit conversion rate as the power bank conversion rate that is not true. Comprehensive conversion rate of above aspects is the most accurate and professional. The problems above contents reflected remind that in the future we should have a significant breakthrough in the circuit technology of power bank when we pursue and explore high-quality power bank. That’s to say, in terms of development and application in the whole circuit board technology which need more intelligent system and adopt more effective components, so as to reduce consumption. Meanwhile, in the production process of power bank, we must 100% test the internal resistance before batteries assembly. And then assembly the batteries that their internal resistance at the same range, so as to make sure in the process of batteries assembly, which may largely reduce the unnecessary consumption of power bank in the normal working and extend the working times. http://www(dot)aroccom(dot)com/blog/discussion-of-power-bank-conversion-rate/
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