140 views Yuda Electronic (HK) Technology Co.,Limited. 2019-03-01
Nowadays, with the continuous advancement of modern science and technology, many things around us have changed quietly. For example, our mobile phone, the mechanical button mobile phone has become a smart machine, this is the change of technology. USB phone charger is one of them, then what are the 5 major protection measures for phone chargers?
1. Overvoltage protection measures
For example, the output voltage of an ordinary mobile phone charger is 5V, the AC power is 220V, and some countries have 110V. Therefore, the mobile phone charger acts as a small transformer to convert the alternating current into a low-voltage power suitable for the mobile phone to achieve charging. Since the voltage will also be unstable, the overvoltage protection is to automatically cut off the output when the output voltage is greater than 5V, to restore the normal voltage and then continue to supply power to protect the device.
2, overcurrent protection measures
In the past, the charging current of mobile phones was generally 1000 mA. However, due to the increasing capacity of mobile phone batteries, most mobile phones can now support 2000 mA current for charging, and currents will be unstable when the current exceeds the rated output of the charger. When the current reaches a certain limit, the circuit will be automatically disconnected to avoid damage to the mobile phone or other USB devices. This limit is generally between 1.2-1.5 times, which is about 2.4A-3A. Continue power supply when the current returns to a stable state.
3, short circuit protection measures
Short circuit is the most prone problem in all electronic products, and it is also the most dangerous problem, so a good mobile phone charger must have short circuit protection. For example, when the mobile phone charger is aging, or the charger is used in an environment that is too humid, it is prone to short circuit, and at this time, the short circuit protection mechanism is immediately activated, and the circuit is disconnected in a few microseconds. This is also the most important protection mechanism in the charger.
4, over temperature protection measures
Sometimes the weather is hot when charging, or when you are charging while playing the phone, this behavior is dangerous, increasing the load on the charger and the mobile phone, which is very likely to cause an explosion accident, and has an over-temperature protection mechanism. The charger, when the temperature reaches about 80 degrees, will stop charging and enter the protection mode to avoid the danger of explosion.(3 Charging Methods for Smartphone)
5, environmental protection fireproof material
In fact, the material of the charger is also a problem that cannot be ignored. Most of the fires caused by the explosion are actually the outer casing of the mobile phone charger. Because the explosion is ignited, which leads to a bigger fire, the regular charger should use ABS+PC. Fireproof material, in order to completely eliminate the hidden dangers of fire.
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