Learn about mobile phone fast charging

Learn about mobile phone fast charging

What is fast charging?

The development of fast charging has made a great breakthrough today. From the earliest ancestral tradition of five volts and one amp to the current speed of dozens of amps of hundreds of watts, it can be said that there has been a qualitative leap.

The application of fast charging has been very extensive. In recent years, if the mobile phone does not have fast charging, it will be embarrassing.

Of course, the agreements between various mobile phone manufacturers are also different. Due to the rapid increase in the power of fast charging, the previous measurement units are not enough to meet the mutual rivalry between various manufacturers. Then a new noun "Lu" appeared. 1 Lu = 10W; Apple's ancestral five volts and one amp is only 0.5 Lu. And some models like Xiaomi have reached 12 rupees.

The principle of fast charging?

Various manufacturers have proposed their own fast charging, which can be summed up as these three. 1. Low voltage and high current; 2. High voltage and low current; 3. High voltage and high current;

1. Low voltage and high current (I)

To increase the power, the easiest way is to increase the current, and the current can be quickly charged, so the Qualcomm Quick Charge (QC) technology appeared. After detecting the D+D- of the USB, the maximum output of 5V 2A is allowed. , Qualcomm Quick Charge (QC) - supports up to 5V2A (10W = 1 Lu), which is the most common fast charging solution, just because this solution is too common, so the solution that is usually less than or equal to 10W is no longer called fast charging.

OPPO VOOC/OnePlus DASH- The same is to increase the current, but OPPO/OnePlus has made it more advanced. VOOC/DASH supports up to 5V4A (20W), which is twice as fast as Qualcomm's QC, and because the voltage is not high, it generates heat The amount is small, but this solution requires special chargers and special charging cables, and the mobile phone is only supported by some mobile phones of OPPO/OnePlus, which is weak in support.

Huawei Super Charge Protocol (SCP) - The same is to increase the current, but the minimum voltage can reach 4.5V, and it supports two modes of 5V4.5A/4.5V5A (22.5W), which is faster than VOOC/DASH.

But how can 5V 2A be enough? The current fast charge starts at 18W at every turn. Maybe you said that it will be increased to 3A? No, after the current is increased, the requirements for the charging cable are also increased. The charging cable needs to be thicker to transmit such a large current, so the next fast charging method appears.

2. High voltage and low current (V)

In the case of limited current, pulling up the voltage to achieve fast charging has become the second solution, so Qualcomm Quick Charge 2.0 (QC2) came on stage at this time. By increasing the power supply to 9V 2A, the charging power of up to 18W was achieved. However, the voltage of 9V does not meet the USB specification, so D+D- is also used to determine whether the device supports QC2 fast charging. Qualcomm Quick Charge 2.0 (QC2) - supports up to 9V2A (18W), the second most common solution, including Huawei Fast Charge Protocol (FCP)/Samsung Flash Charge are all extended by QC2.0, but this solution is due to higher voltage , easy to heat up.

MediaTek Pump Express Plus (PE+) - supports 5/7/9/12V 3/4.5A (up to 15W), there are very few mobile phones using this solution.

USB Power Delivery 1.0-supports a variety of schemes, 5/12/20V 1.5/2/3/5A (up to 100W), designed for a variety of devices, can charge laptops. (needs a new type of connector, a cable with enough amperage)

But high voltage means more consumption, the lithium battery of mobile phone is generally 4V, in order to charge, there is a charging IC in the mobile phone to control the process of charging and discharging, and reduce the voltage of 5V to the operating voltage of the lithium battery (about 4) If the charging voltage is increased to 9V, the energy loss will be more serious, so that the mobile phone becomes hot, so at this time a new generation of fast charging technology has appeared again.

3. High voltage (V) and high current (I) - dynamic control

Since unilaterally increasing the voltage and current has disadvantages, then increase both! By dynamically adjusting the charging voltage, the mobile phone will not overheat when charging. For example, Xiaomi's 12 Lu fast charge, Huawei's SCP (4 Lu, 6.6 Lu) and so on.

Learn about mobile phone fast charging

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