Mobile phone manufacturers are limited by the size of their mobile phones and their battery capacity is limited, so they began to turn their attention to fast charging. Fast charging is a technology that increases the charging power of mobile phones within a reasonable range and aims to quickly replenish most of the power for mobile phones. The charging power is equal to the current multiplied by the voltage. There are currently two solutions that can increase the charging power, high voltage, small current and low voltage and high current.
For example, the process of charging a mobile phone is like a process of dripping a mineral water bottle with a hole in the bottle. To speed up, first squeeze the water bottle to make the water flow faster, which is the high voltage and small current. The second is to tie another hole. At the same time, the water flow doubles. This is the low voltage and high current.
High voltage and small current
In 2013, Qualcomm introduced the Quick Charge 1.0 standard to increase the charging efficiency by increasing the input current, allowing the handset equipped with the Snapdragon 600 processor to support 5V/2A”/charging. However, due to the limitations of the micro USB interface, the input current should not be too large, so Quick Charge 2.0/3.0 can increase the power by increasing the supply voltage, which can achieve 9V/2A. In 2016, Qualcomm introduced the Quick Charge 4.0 standard, which is said to support the optimal voltage intelligent negotiation algorithm to provide the most suitable charging voltage for the battery. In addition to Qualcomm, MediaTek’s Pump Express Plus 1.0/2.0, Samsung’s Fast Charge, and Meizu’s charge 3.0 also use this high-voltage, low-current solution.
Low voltage and high current
Remember to charge for five minutes and talk for two hours? In 2014, OPPO introduced VOOC flash charging technology with a charging power of 22W. VOOC flash charging is a typical low-voltage and high-current solution, but as mentioned earlier, the micro USB interface will limit the current, so OPPO has customized the charger and charging cable, and even the internal circuit of the mobile phone has been modified to support 5V/4A. At present, OPPO’s dual-cell SuperVOOC super flash charging has a maximum charging power of nearly 50W and can charge 40% in 10 minutes. Also using this solution is Huawei SuperCharge Super Fast Charge, plus DASH Flash Charger.
Most Android phones that support fast charge will be equipped with a fast charge charger. There are exceptions, of course, so don’t ignore the accessories when buying the product. Be sure to look at the voltage and current requirements above.
High-voltage small current and low-voltage high-current are all in order to solve the charging problem, and there are differences due to different solutions to the micro USB problem. But now it is progressing, becoming smarter and safer, and micro USB is now undergoing changes, and mobile phone charging will become more and more perfect in the future. But now, you can turn on the “power saving mode” or choose the right fast charge charger to speed up.
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