What are the reasons for the danger of mobile phone chargers?
Sep 16, 2019| What are the reasons for the danger of mobile phone chargers?
1, the trend of miniaturization of mobile phone charger is very obvious, compared with the traditional big-headed transformer, the current charger uses more switching power supply, replaced by a very small high-frequency transformer, and some do better charging The device also has output feedback, and the output feedback is mostly through devices such as optocouplers. The value here shows that whether it is a high-frequency transformer or an optocoupler feedback, one is electromagnetic isolation, one is optically isolated, and there is no electrical connection. Even if the transformer or other components burn out, the 220V power supply will not be stringed to the mobile phone under normal conditions. Come. In the case of an electrocution, the most likely condition is that the charger is flooded and the circuit is shorted.
2, the charger is damaged, the most is the two cases, the first is the explosive capacitor, this movement is relatively large, because it is the switching voltage regulation, once this part of the circuit has a problem, the voltage is not normal, the most direct is the explosive capacitor. The second is the explosion transformer, which is mostly caused by the load. Since most chargers have virtual standards, most of them have no feedback and protection circuits, and the transformers are very common. As long as there is no water and no damage, these two are generally not too dangerous for people, but because of the miniaturization of many chargers, the high voltage and low voltage are very close, many chargers have sufficient physical isolation, and a capacitor is used. Energy can easily cause misalignment and adhesion of components inside, posing a hazard.
3, the charger does not necessarily buy the original, but must buy a regular, ordinary mobile phone must be more than 1A current output, iPad and other tablet computers must buy 2A urgent above the current output. The high-current charger can be used on low-current devices, so the iPad's 2A charger is rushed to the 1A iPhone and other phones.
5, the computer's USB output is only 500mA, so the current mobile phone has a detection function, by detecting the resistance between the two wires of USB D+, D- to determine whether it is connected to the computer or USB, all of the chargers do not have this Resistor, in the Android phone battery will display USB instead of AC, affecting the charging speed, this needs attention.
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