Now almost everyone of us has a mobile phone, and we charge the mobile phone every day during normal use to extend the time we use the mobile phone. Then a qualified mobile phone charger is particularly important. A charger with a quality problem may prevent the phone from charging and even cause serious problems such as fire. The charger is related to the safety of our lives, so safety must be guaranteed. During the production process, charger testing is essential! Let’s take a look at what types of charger product testing and testing there are.
Charger product testing and inspection during the production process :
I believe that after reading the above introduction, you have a certain understanding of the safety of our company’s chargers. Let’s continue to share below:
Technical specifications for mobile phone chargers
1.1 Use environment
1.2 Charger power input mode
AC input voltage: supply voltage AC100-240V;
minimum voltage: 90V, maximum voltage 264V. Input power frequency: 47~63HZ
No-load voltage 4.75V~5.25V, load voltage 4.75V~5.25V
1.3 Maximum current of AC input terminal:
The surge current at the moment of power-on is less than or equal to 30A, and the current during normal operation is less than or equal to 120mA.
1.4 Leakage current
Charger leakage current to ground≤0.25mA
1.5 Charger working efficiency
Charger efficiency ≥50% (input voltage is AC90-264V, output current is 400-500mA, output voltage is 4.2V).
1.6 No-load output voltage of the charger
USB port output voltage: 5.0V-5.25V
1.7 Charger output current
The USB port output current range is between 250-350mA (output voltage ≥ 4.2V).
1.8 Maximum output ripple voltage 300mV
1.9 Load capacity
When the charger DC is connected to the power supply, the output terminal can be continuously open for a long time or connected to any other resistive load without any electrical damage.
1.10 Response time
The time from the moment the charger is powered on to the normal operation of the output circuit should be less than 3S (AC input is AC90～264V, output current is 0～500mA).
1.11 Insulation strength
The output circuit and the shell should be able to withstand a voltage of 50Hz and an effective value of 500V for 1min without breakdown or arcing.
1.12 Insulation resistance
When the ambient temperature is 15～35℃, the relative temperature is 90%, and the test voltage is DC 500V, the insulation resistance between the live parts and the output circuit and the shell is not less than 7MΩ. The insulation resistance between the output circuit and the shell is not less than 2MΩ.
1.13 Appearance structure
A. The surface of the charger housing should be flat and smooth without scratches, burrs and other damages, and the exposed hardware should be free from embroidering, oxidation, etc.
B. The power input and output plugs and connecting wires of the charger should be firmly connected with the charger, and the test should be carried out with a 10N tensile force. There should be no looseness or fall off in each part.
C. The size and material of the charger shell; the weight of the charger is ±3g
1.14 Low temperature charging performance
The test method is carried out in accordance with “Test Ab” in GB2423. 1-89. The product is not packaged, the test temperature is -20℃±3℃, and the test duration is 4h. After recovery, the charger function should be normal.
1.15 High temperature charging performance
The test method is carried out according to (“Test Bb” in GB2423.2-89. The product is not packaged, the test temperature is 65℃±2℃, the test duration is 4h, and the charger function should be normal after recovery.)
1.16 Constant damp heat test
The test method is carried out in accordance with “Test Cb” in GB/T 2423.9-89. The product is not packaged, the test temperature is 40℃±2℃, the temperature is 90%-95%, and the test duration is 48h. The charger function should be normal after recovery.
1.17 Vibration test
The test method is carried out in accordance with “Test Fe” in GB/T 2423. 10-1995. The frequency is 10-55Hz, the amplitude is 0.35mm, and the number of frequency sweep cycles in each direction is 10 times. After the test, the charger function should be normal.
1.18 Free drop test
The test method is carried out in accordance with “Test Ed” in GB/T 2423. 8-81. The height is 100m, the test table is a hardwood board with a thickness of 20mm, and the number of tests is 2 times. The charger function should be normal after the test.
- 19 Anti-static test
The test method is to apply electrostatic air discharge at either end of the AC input or DC output. The specific indicators are: ±15KV voltage, discharge resistance 3300, discharge capacitance 150PF, and space distance 1mm. After the test, the charger function should be normal.
The above test standards are used as the company’s internal inspection standards and can only be used for reference by friends.