Nowadays, we can buy chargers everywhere, and we can see there are different kind of chargers, they have different structures and functions.
Some have multiple ports so that they can charge several phones at the same time; some can display voltage on their LED screen so that we can see the output of these ports; some can support quick charge protocols so that they can charge phones quickly.
Today I want to show you how to use our USB tester to test a charger
Here is a charger which I use everyday:
We can see there are three interfaces on the charger, one quick charge port and two common USB port.
Input：100V-240V AC 50/60Hz Output 1: DC3.6V-6.5V/3A DC6.5V-9V/2A DC9V-12V/1.5A here is the technical parameter:
Input：100V-240V AC 50/60Hz
Output 1:
DC3.6V-6.5V/3A
DC6.5V-9V/2A
DC9V-12V/1.5A
It says this port can support QC2.0/QC3.0, Huawei FCP, Sumsung AFC, IOS5V/2.4A quickly charge.
Output 2/3:DC5V 2.4A Max
So there are two kinds of output of this charger.
Then we use UM25C to test these outputs：
First we check the 3A port,we connect devices in this way: power-charger-USB tester-load. Adjust the current value,and we can see pictures below.
I use HD35 as electric load, set current 3.0A, but we can see the screen turns off at 2.6A, which means this charger stop output , so I know 6.5V/3A can only be detected when the charger is under quick charge mode. But I don’t know which quick charge mode can it support, it cannot be QC3.0 though it is written on its introduction, I tried but useless.
So I tried another way, I can test the power. We know it can support 6.5V/3A, so the power must be 19.5W, I ******* QC2.0 mode, 12V output, and I increase the current. We can see it can support over 20W. So this quick charge port can support some protocol which can not be detected by HD35.
I test the 9V/2A and 12V/1.5A, they can be triggered at QC3.0 mode.
I use Huawei standard charger as a comparison.
First we use trigger function to trigger QC3.0 9V mode, increase the current slowly until it is 2A, check if the voltage drop more than 0.5V, if so, the quality is not so good.
We can see voltage drop is less than 0.5V, it is good.
By the way, we can check the working temperature, when it works at 5V/1A,it is not hot, when I use 9V/2A, it is much hotter than Huawei standard charger. So this is a little shortage.
Charger I use:
Huawei charger:
Then I use my iPhone7 plus to test, we can see it is under APP5V/2.4A mode, though the real current is 1.676A, I know the real current value is affected by many factors: remaining battery/cable quality/phone type and so on.
Test the other ports and when I use my my iPhone7 plus as load, it can be triggered in APP2.4A mode.
In general, this charger is good for iPhone, it can help charge faster, but it should give us the protocol which support 6.5V/3A quick charge, or which phone can use this quick charge mode , and it produce more heat under full power than Huawei standard charger.
