The mobile phone charging line, the length of the line affect the charging speed?
The speed of mobile phone charging is generally affected by three aspects.
1, the power adapter (ie, the charger) can meet the needs of the mobile phone's output power. According to the battery capacity of the mobile phone, the charging current requirements are also different, usually 05C-0.8C, such as 2000MAH battery 0.5C, is the current 1A, 0.8C is 1.6A, his charging current is in 1A to 1.6A In between, the mobile phone will generally set this value, 1A or 2A, in order to meet the output standard of the power adapter (charger) on the market. The simple one can be understood as the charging current of the battery capacity is less than 2500MAH is generally 1A, the charging current is greater than 2500MAH is 2A. The output current of the selected power adapter is equal to or greater than the charging current of the mobile phone. There is a common misconception that some people think that high-powered chargers will burn mobile phones or overcharge the battery. In fact, the output current of the power adapter is its maximum output. The actual input current when the mobile phone is charged is determined by the control circuit of the mobile phone. Is not determined by the power adapter. Burning a cell phone or overcharging a battery is a poor quality power adapter. The output voltage of the power adapter exceeds 5.2V and is determined by long-term charge. It has nothing to do with high power. When choosing a power adapter, it is recommended to select a power that is a little larger than that of the mobile phone. In this way, the power adapter does not operate at full capacity and it can ensure a stable output of the current.
2. The data line pressure drop is qualified. The data line is connected to the charger and the mobile phone, because the data line has resistance, so there will be voltage drop on the data line. If the resistance is too large, it will cause a large amount of power loss on the data line. Affecting the charging speed, the copper wires in some roadside data cables on the market are very fine (the more fine the resistance is), not even pure copper (such as copper-clad aluminum). The resistance is very high, which may cause your charging speed to change. Slow, even not charging.
3. Is there a current limit in the charging mode? If you use an improper way to charge it may also be limited charging current, resulting in your power adapter is no longer able to play a role. There are two kinds of common current limiting, one is charging in data transmission mode, the current will be limited to 0.5A or less, and it is common in office crowds who use the computer USB port to charge the mobile phone. The easiest way to solve this problem is to put the data. The line is replaced with a special charging line. Another kind of current limiting is on Apple's products. Apple's products add a voltage value at the D+\D- terminal of the input current as a method to identify whether it is an Apple-specific charger, if the ordinary charger puts D+\ D-short circuit, Apple products will limit the current, previously limited to 0.5A, now has a side to 1A, so to charge Apple products, it is best to choose a charger with Apple identification circuit.
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