Eahunt Cell Phone Chargers With Certification

What are the reasons for the danger of cell phone chargers?
1, the trend of miniaturization of cell phone chargers is very obvious, and the traditional big head of the transformer compared to the current charger more than the use of switching power supply, replaced by a very small size of the high-frequency transformer, and some of the better charger with output feedback, output feedback most of the devices through the optocoupler. Here is worth stating a point, whether it is a high-frequency transformer or optocoupler feedback is electromagnetic isolation is an optical isolation, there is no electrical connection, even if the transformer or other components burned out, under normal circumstances, 220V power supply will not be strung to the side of the phone. Occurred to be electrocuted this situation, the most likely situation is that the charger into the water leading to a short circuit.
2, the charger is damaged, the most is two kinds of cases, the first is the explosion of capacitors, this movement is relatively large, due to the switching voltage regulation, once this part of the circuit has a problem, the voltage is not normal, the most direct is the explosion of capacitors. The second is the explosion of the transformer, which is mostly caused by the load, due to most of the charger false labeling, most of the feedback and protection circuitry is not yet, the transformer burst is very common. As long as the water is not damaged, these two generally no great danger to people, but because many chargers miniaturized, high voltage and low voltage very close, many chargers inside there is no adequate physical isolation, bursting a capacitor of this energy can easily lead to components inside the misalignment, adhesion and thus causing danger.
3, regardless of which brand, most of the chargers are domestic, the charger itself has no technical content, the biggest constraint is still the cost of the biggest factors, and the current false standard is almost common to all the cottage chargers, even if you go on Taobao to buy the original, in most cases it is also very difficult to buy the genuine article, so I usually buy Palm HP Microsoft and other obsolete products chargers, more than ten dollars, but the quality of the first line of products, the quality of the other chargers convenient to dismantle the machine, I would like to buy a charger. Other chargers are convenient to dismantle the machine I will first dismantle to see a bottom.
4, the charger does not necessarily buy the original, but must buy a regular, ordinary only cell phone must be more than 1A current output, iPad and other tablet computers must buy 2A urgent more than the current output. High-current chargers can be used in small-current devices, so the iPad's 2A charger punch 1A iPhone and other cell phones are no problem.
5, the computer's USB output is only 500mA, so now the phone has a detection function, by detecting the USB D +, D - resistance in the middle of the two wires to determine whether to connect to the computer or USB, all the chargers do not have this resistor, in the Android cell phone battery will be displayed in the USB rather than AC, affecting the charging speed, which need to pay attention to.

If you want to know more about switching power supply information, you can consult Xiamen Eahunt Electronics.

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Email: athene-cai@eahunt.com

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