Over the years, with the gradual explosion of the portable electronic products market, a variety of peripheral accessories also followed gradually into people's field of vision. With the same battery, charger is also a need to pay attention to the use of safety accessories, we often see in the TV news, due to the use of low-quality or three chargers and the occurrence of hot or even fire and other accidents. Some unscrupulous manufacturers in pursuit of low cost and high efficiency, put the product safety in disregard, in the design of charger products do not strictly in accordance with the IEC60950 and the national standard GB4943-2011 in the limitation of the power meter power supply safety requirements, or do not have to add the charger products in the circuit protection devices. When a short circuit or other abnormally high current occurs in the charger, the charger causes a fire accident because of the high temperature.
It is a common phenomenon that chargers get hot during use, and heat-generating components such as high-voltage capacitors, switching tubes and transformers are used in their circuits. In order to meet the demand for people to carry, the charger volume towards the direction of the development of smaller and smaller, the distance between the components has become more close, once a component is easy to affect the peripheral circuits caused by the damage to the entire charger. So, how to design the charger circuit, the circuit protection devices will be properly utilized has become the key to the problem.
In fact, the solution to this problem is very simple: in the charger output port using high-quality resettable fuse PPTC, when the output short circuit or internal component failure caused by excessive charging current, it can quickly start, cut off the current, so that the charger will not be due to high temperatures and lead to accidents, while also preventing lithium batteries because of the overcharging caused by fire and explosion and other safety accidents.
Under normal circumstances, the self-recovery fuse into a low resistance state, will not affect the circuit. When over-current or short-circuit failure occurs in the circuit, the heat of the high current will make the polymerized resin volume increase rapidly, forming a high-resistance state, and the operating current decreases rapidly, so as to limit and protect the circuit. The advantage of using a self-resetting fuse PPTC is that it can be reused many times without replacement and does not incur additional maintenance costs, which is in line with people's expectations of low prices when choosing charger products.
Finally, some more tips for using chargers:
1. As far as possible to use the original charger, the output voltage and current and battery characteristics to match, not only to ensure the safety of charging, but also to maximize the use of battery energy.
2. When buying a charger, pay attention to the brand and 3C certification, after 3C certification of the charger in the electrical safety and electromagnetic compatibility performance to meet the requirements of the national mandatory standards, safety is guaranteed.
3. Do not charge the battery in a high temperature environment, such as inside a car or near other heat sources in summer, so as to avoid accidents when the charger temperature is too high.
4. Do not charge for a long time in an unoccupied room or keep the charger plugged into a power outlet, which consumes energy and poses a safety hazard. 5.
5. Do not use your cell phone while charging to avoid accidental injury.
