228 views Yuda Electronic (HK) Technology Co.,Limited. 2018-12-10
Phone charger with over-temperature protection function, when the temperature of the
charger chip reaches about 85 °C, it will stop charging and enter the protection mode to
avoid the danger of explosion of the phone charger and mobile phone. What is the cause
of the explosion of the mobile phone charger, kind of phone charger is a qualified product?
Let’s look at a news first. Mr. Jack, who lives in the West Coast, bought a phone charger
without any logo for $1.50 in a dozen-square-size mobile phone accessories store. After
returning to the company, his mobile phone was almost out of power, and he used this
phone charger to charge the phone. As a result, the phone charger exploded, the charging
cable and the plug were burnt, and the company’s entire building was powered down.
From the news, everyone should have already learned that the reasons for the explosion of
mobile phone chargers are mainly the following three points.
1, buy inferior products
Many street retail stores sell phone chargers under $2, which can be fully charged when used,
but without any logo, even the most basic brand names. However, if a phone charger is broken,
or if you want to have a phone charger in the office, you may choose to buy it because it is
cheap.You know that buying a phone charger with no product information like this is a time
bomb. In order to save cost, these phone chargers are very simple and have no protection
function. When the charging voltage is unstable, the components inside are easily short-
circuited by current breakdown, and because there is no short-circuit protection, they accidentally
If you are purchasing a phone charger that does not have any product information, you can check
if the phone will flash, leak or reflect slow when charging. For your own safety, it is recommended
not to use it again.
2, long-term unplug phone charger
Many people have such bad habits. The phone charger is always plugged into the socket. When
charging is needed, plug the USB interface. After charging, simply unplug the phone and never
remove the phone charger from the socket.
The phone charger is plugged into the socket for a long time. Although there is no phone connected,
there is still current flowing through it. This will not only cause the phone charger to age, but also
cause a short circuit, which may cause fire, explosion, and even accidental electric shock. Therefore,
after the phone is fully charged, you should unplug the phone charger or turn off the power of the outlet.
3, phone charger aging
Although it is a regular original phone charger, after a certain period of time, the internal components
are aging, not only the charging speed becomes slow, but also the risk of explosion may occur when
the voltage is unstable, so the phone charger is preferably changed for two years or so. once.
Of course, in addition to this, the explosion of the phone charger may also be related to the charging
environment. For example, charging in an environment with too high temperature may easily cause
the phone charger and the mobile phone to explode.
But how do we judge if the phone charger is inferior? A qualified phone charger has a certain standard.
There is a certification mark on the phone charger. This mark indicates that the phone charger meets
the national mandatory standard requirements in terms of safety and compatibility, and the quality is
guaranteed. However, a really good charging product, in addition to certification, should also have a
protection function to avoid overload and lead to accidents.
The phone charger should have the following protection features:
1, overvoltage protection
The average output voltage of a normal mobile phone charger is generally 5V, and we
all know that the AC voltage is 110V/220V standard, and the mobile phone charger will
convert the AC power to a low voltage and then transmit it to the mobile phone like a
transformer. Overcharge protection phone charger, when the voltage is unstable, the
output voltage is higher than 5V, the phone charger will stop charging the phone directly,
and when the output voltage returns to the normal range, it will automatically turn on,
so as to avoid the load or the moment. High voltage damages the phone battery.
2, overcurrent protection
Overcurrent protection means that when the current exceeds a certain limit, the phone
charger will automatically disconnect the circuit, so that the phone charger and the
mobile phone are protected from being burned by a large current.
At present, the actual charging current of mobile phones is generally between 1A-2A.
If the mobile phone charger you purchased indicates that the output is 5V2A, the
overcurrent protection of the phone charger is 1.2-1.5 times higher than the output
current (that is, 2A), that is, when the output current exceeds 2.4A-3A. The protection
mode is activated and the charge is automatically restored when the current is stable.
3, short circuit protection
There are a lot of mobile phones on the market that only have overvoltage and overcurrent
protection, but there is no short circuit protection, and high quality phone chargers will have
short circuit protection.
4, over temperature protection
When the mobile phone is charged, there is a certain requirement for the temperature
environment. If the phone charger is overloaded for a long time, the temperature of the
component is too high, which will shorten the life of the phone charger. Phone Charger
with over-temperature protection function, when the temperature of the charger chip
reaches about 85 °C, it will stop charging and enter the protection mode to avoid the
danger of explosion of the charger and mobile phone.
5, the use of fireproof materials
The charger will explode and cause a fire, which is caused by the combustion of the
charger casing in most cases. The high-quality charger will use ABS+PC professional
fireproof material to completely eliminate the possibility of fire caused by the charger itself.
At present, the original chargers of major brands of mobile phones basically have the
above protection functions. So many people will choose to buy a cheap and inferior
charger, in fact, that is the wrong choice.
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company specializes in wholesale original phone accessories and original car
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