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Mobile Charger A Device For Providing Energy To A Power Storage Device
Sep 14, 2017

The mobile phone charger is a stable power supply (which provides a stable operating voltage and enough current) plus the necessary constant current limit voltage limit and other control circuits, mainly for the power storage device to provide energy equipment. In life is widely used in mobile phones and other digital equipment.

Mobile charger, also known as mobile power, charging Po, in fact, by a stable power supply with the necessary constant current, limiting pressure, time limit and other control circuit. Mobile phone charger can be divided into travel charger, seat charger and maintenance-type charger, the general user contact is the first two. And the market is selling the most travel charger, travel charger in the form of a variety of common, cheap and cheap duck-type mini-travel charger, the general desktop card board charger, LCD display with high-end desktop charge Device.

Species distinction

Mobile phone charger can be divided into travel charger, seat charger, USB charger and maintenance-type charger, the latest is the phone shell charger.

Phone case charger

The overall appearance of the mobile phone case charger and ordinary mobile phone shell is no different, the phone shell is slightly thicker than the ordinary phone shell. With 2300mAh battery capacity, can provide a complete charge, generally by the lithium batteries or batteries as a storage unit.

Other chargers

General user contact is mainly in front of two. And the market is selling the most travel charger, travel charger in the form of a variety of common, cheap and cheap duck-type mini-travel charger, the general desktop card board charger, LCD display with high-end desktop charge Device. In view of the vast majority of mobile phone users are non-professional users, so the charger is basically full of self-stop function, and most of the travel charger are fast charger, charging time in 1-3 hours. Many chargers on the market are advertised by their own microcomputer control, including some very cheap duck-type mini-travel charger, in fact, strictly from the charging circuit analysis, a small part of the charger can be truly sense of being microcomputer control (microcontroller control) The

Some manufacturers in the charging line on the use of the integrated block on the self-proclaimed "microcomputer control", in fact, many low-cost design of the selected block are cheap transport integrated block, and some special charge control integrated block higher unit price , Generally used to compare high-end or brand-name chargers. So we can not believe in the so-called microcomputer control, especially cheap products. Many products look similar but the internal lines are quite different, its performance is also very different.

The main function 

1, good quality charger can identify lithium batteries and nickel-metal hydride batteries, and then determine the charging mode. Lithium battery protection circuit board has an integrated circuit stored lithium battery characteristics of information, it on the one hand so that the cradle can identify lithium batteries to determine the "constant current" and "constant voltage" charging mode; the other hand, Identify the lithium battery to determine the discharge mode.

2, nickel-metal hydride battery charging method using "constant current". Ni-MH battery itself is not afraid of overcharging, when the nickel-metal hydride battery overcharge will have a reverse reaction to prevent excessive voltage rise, the reaction will make the battery slightly fever. In addition, nickel-metal hydride batteries are usually added with a thermistor to prevent the battery overcharging. Most of the mobile phone operating voltage is about 3.6V, it needs three nickel-metal hydride batteries. And the general nickel-metal hydride batteries overcharge to about 1.4 ~ 1.5V or so to stop, three batteries maximum voltage of 4.4V or so.

3, due to lithium battery overcharge will be dangerous, so the charge and discharge settings than nickel-cadmium batteries and nickel-metal hydride batteries should be harsh. Lithium battery is usually attached to a control circuit board to prevent overcharge. According to the characteristics of lithium battery design, the first paragraph of the charge is "constant current" way to charge, until the fast charge when the "fixed voltage" (about 4.1 ~ 4.2V) between the way the battery to achieve the best condition. Some of the market coke cut corners, the mobile phone batteries are identified as nickel-metal hydride batteries, and "constant current" way to charge, often easily lead to excessive lithium battery charging. Good quality protection circuit board at this time will be lithium battery protection to prevent the charger to continue charging. If you encounter a bad design of the circuit board, not only can not protect the battery, causing the battery overcharging, may also lead to excessive battery charge deformation, leakage, explosion and so on.

4, cradle mostly use fast charging, usually in 3 to 4 hours that is full. When the cradle shows the charge is completed, even if the battery is not charged from the seat, only a very weak battery into the battery.

5, nickel-metal hydride battery memory effect is not large, do not often discharge, lithium battery is basically no discharge. The sales of the charger on the market, the attached discharge device quality varies. Poor quality will have the phenomenon of over-discharge, easy to cause the battery inside the negative plate corrosion (nickel-metal hydride batteries inside the electrolyte is alkaline solution of potassium hydroxide), thereby reducing the battery life and the usual capacity can be used. In this case, each time the first discharge and then charge, then the battery will be worse. Under normal circumstances, as long as a battery of electricity used to automatically shut down after charging, that is, the best battery discharge method.