Test measured: mobile phone fast charging head mixing can not work?
In the environment where lithium battery technology has not made a big breakthrough and new energy batteries have not yet been applied to electronic products, the battery life problem has been plaguing the majority of mobile phone users. The emergence of fast charging technology allows users to charge more power to the phone in fractional time. It can be said that the battery life problem is solved from another aspect. However, there are still many netizens who mistakenly believe that fast charging heads can be used interchangeably. Today, the author brings 2 experiments for everyone: 1. Verify the compatibility of the fast charge mobile phone/charger and 2. The speed performance of the non-original charger for the iPhone 6s.
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1. The output voltage/current on the charging head is only the maximum allowable value, not the actual output value. The actual output value depends on the specific needs of the mobile phone/mobile device.
2. Charging first passes through a constant current phase. At this time, the actual battery voltage is lower than the charging voltage (mostly 4.3v). During the constant current charging process, the battery voltage increases, and when it is raised to about 4.3v (the battery power is about 85% full), Entering the 2 constant voltage mode, the charging current is gradually reduced, the charging is almost completed, and then enters the 3 trickle charging mode to charge the pulse current to extend the battery life.
3. The larger the battery capacity, the greater the charge current that can be withstand, which is what we often call charging 0.5c, 1c. For a chestnut, a 3000mAh 0.5c (charged) battery can withstand a charging current of 1500ma, which is 1.5a. With the innovation of technology, the current charging current value of lithium battery is increasing, which greatly shortens the charging time in the constant current phase.
4. The voltage output from the charging head will not be directly loaded into the battery level, and there will be a secondary step-down electrode inside the phone. Therefore, the high-voltage 9v, 12v of fast charge is only to improve the charging power, reduce the heat loss during transmission and avoid reaching the microUSB port current limit. It is not that 9v and 12v are directly loaded on the battery poles.
Experiment 1: The speed of charging the iPhone 6s with different charging heads
Many people may remember that when the iPhone on their hands uses some third-party charging heads or data cables for charging, the phone will prompt “This cable or accessory has not been certifiedâ€, and the charging current will be limited, which greatly increases the charging. The time required. But now, even if we are using a non-original charging head, it seems that we rarely see the "This cable or accessory has not been certified" prompt. Then the problem is, even if there is no relevant prompt now, using the non-original charging head and the original charging head to charge the iPhone, will the charging speed have an impact? Below we pass the experiment to authenticate.
Test link:
Test mobile phone: iPhone 6s (Hong Kong version, iOS 9.3.1), charging head: iPhone original, plug-in board with USB port, third-party charging head.
Test method: Real-time monitoring of charging using USB voltage/current detector, and distinguishing the voltage/current value of monitoring 6s at 10%, 50%, 95% three times (the specific power is slightly deviated). (The same mobile phone has a certain demand for input voltage/current at the same remaining power. Therefore, as long as the voltage/current values ​​read at three times are similar (the power is basically the same), the overall charging time can be considered to be small. )
The test results show that the third-party charger and the original charger of the iPhone have the same output power during the two periods of the test (fast charging phase/turbulent charging phase), at this time the charging speed is equivalent, and the board with USB output is When the output voltage is relatively large, the output power is also ahead of the other two. Therefore, the charging speed ranking (estimated) is: socket with USB "iPhone original charger = third-party charger (from fast to slow). Of course, different third-party chargers/sockets with USB have different output effects.
Test power: 10% (original charger; third-party charger; USB port board)
Test power: 50% (original charger; third-party charger; USB port board)
Test power: 50% (original charger; third-party charger; USB port board)
I used 5 different brands of original chargers + 2 plug-in boards with USB output for testing (50% of the phone), and found that the output voltage is slightly larger than 5v (some lines can be higher to 5.3v, There is no line compensation below 5v), and the current is also around 1a. So using some non-original charging heads to charge the iPhone will indeed be faster than the original charging head. Of course, the cottage / poor quality charger will be said.
Lab 2: Fast Charger/Charging Head Compatibility Test
In addition to verifying whether different charging heads have an effect on the charging speed of the iPhone, I found that many friends around me have misunderstandings about fast charging. They think that the fast charging head can be mixed (example: holding the Meizu fast charging head charging Qualcomm platform) Mobile phone). In fact, the specific can not be mixed, depending on the protocol supported by the charging head and the fast charging protocol used by the mobile phone. If the two protocols are the same, they can be mixed. If the two (mobile phone, charging head) protocols are not compatible, the fast charging will not work (the charging will fall back to the normal speed).
Test link:
Test mobile phone: OPPO R9, Moto X pole, Meizu PRO 6, charging head: VOOC flash head, Qualcomm official QC charging head, Meizu MX5 charging head (UP1220). Among them (OPPO R9 should be used with VOOC flash head: VOOC flash charging protocol); (Moto X should be used with Qualcomm official QC charging head: QC2.0 fast charging protocol); (Meizu PRO 6 should be used with MX5 charging head: MediaTek PEP Fast Charge Protocol).
Three fast-filled heads selected
Test method: Three mobile phones are mixed with three chargers for voltage/current recording, which is compared with the original charger. The charging test starts with 10% of charge and charges for 15 minutes.
* The table brackets are the charging power of the original charger. In addition, the PRO 6 original charger will affect the test result because it supports the QC protocol, so the MX5 charger is selected. (just use PEP fast charge)
From the test results, it is known that fast charging with different protocols can not achieve the effect of fast charging (only slow charging), that is to say, which fast charging scheme is used by mobile phones, it is necessary to match the fast charging that supports the protocol. In addition, the support of the fast charge protocol does not depend on the processor platform. For example, the LeTV super mobile phone 2 uses the Helio X20 platform, and the BQ25892 charging IC is written with the Qualcomm QC protocol, which is used with the Qualcomm QC charging head.
There are already a lot of charging heads that support 2 or more fast charging protocols, and they can also adapt to fast charging phones with different protocols. However, it is currently limited to high-voltage fast charging (such as QC, PEP, PD), and high-current fast charging (such as VOOC) has no other compatible solutions. The specific knowledge about fast charge is not elaborated. If you are interested, you can see the following two articles.
In addition, consumers need to press the specific model information of the mobile phone when purchasing a third-party fast-filling head, otherwise the money will be easy to float.
Experimental summary
This experiment draws two conclusions: 1 Some non-original charging heads will charge the iPhone more quickly; 2 mobile phones that support fast charging need to use the charger corresponding to the fast charging protocol.
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