What is fast charging?
| 2019-8-28 13:56:29
What is fast charging?
Fast charging, referred to as fast charging, in the case that the mobile phone battery can not quickly improve, the way to improve battery life is: 1. Increase battery capacity 2. Speed up charging.
However, increasing the battery capacity will cause the mobile phone to become heavy, so fast charging has become one of the important functions pursued by various manufacturers/consumers. Here are a few examples of how to improve your fast charge and how they differ.There are currently several ways to increase power:
1. Increasing current (I)
To improve power, the easiest way is to increase the current, pull the current high to quickly charge, so Qualcomm Quick Charge (QC) technology appears, after detecting USB D + D -, allows the output of up to 5V 2A , but 5V 2A is enough? Now it is fast to move and 18W takes off. Maybe you said that it will be upgraded to 3A? No, after the current is increased, the requirements for the charging line are also increased, and the charging line needs to be thicker to transmit such a large current. The following fast charging method appears.
2. Increasing voltage (V)
In the case of limited current, the high voltage is quickly charged into a second solution, so Qualcomm Quick Charge 2.0 (QC2) debuted, and by boosting the power supply to 9V 2A, the charging power of up to 18W is achieved. However, the voltage of 9V does not conform to the USB specification, so it is also determined by D+D- whether the device supports QC2 fast charging. But...high voltage means more wear and tear. The lithium battery of the mobile phone is generally 4V. In order to charge, there is a charging IC in the mobile phone to control the charging and discharging process, and the voltage of 5V is lowered to the operating voltage of the lithium battery ( About 4), if the charging voltage is raised to 9V, the energy loss will be more serious, so that the mobile phone is hot, so the new generation of fast charging technology has appeared again.
3. Dynamic boost voltage (V) current (I)
Since unilaterally raising the voltage and current has shortcomings, then both can be improved! By dynamically adjusting the charging voltage, the phone will not overheat when charging. This is Qualcomm Quick Charge 3.0 (QC3), but this technology is not No shortcomings - high cost.
