Of course, the mobile power is not a one-off device, which can be reused hundreds of times. So when power mobile power after use, we must give mobile power charging. The principle is the same, and to charge the phone. Connected to a computer's USB port or 5V USB Power Charger for charging mobile power. Therefore, there must also be an internal mobile power charging management system. Rechargeable lithium battery management system according to the voltage automatically adjusts the charge current. Process are: pre-charge, constant voltage charging and floating charge and so on.
The following describes the next component.
Commonly used polymer lithium battery, 18650 lithium battery, AAA NiMH batteries.
Polymer battery: Standard voltage 3.7 V, the shape more customizable, has a large capacity, inexpensive, widely used, such as: mobile phone, MP4, portable speaker.
18650 Lithium Battery: Standard voltage 3.7V, with small size, large capacity, standard voltage 3.7V, mainly used in notebook computers and other high-end products.
AAA NiMH batteries: Standard voltage 1.2V. Capacity is relatively small.Should be widely, household appliances, and other players.
Boost System: Boost mainstream technology basically uses DC to DC boost mode. Conversion efficiency of domestic technology generally low, generally in the 50-70%. 75-80% in Taiwan. The United States will be relatively higher. Also there is relief programs, the efficiency is relatively high, but the consistency of batteries with high requirements, so rarely used.
Charge Management System: The domestic charge management system is relatively mature, intelligent IC monitors the entire charging process.Mainstream Management IC with PT4056, PX40, etc. Charge time 5000maH about 8 hours. Fast charging of the battery life has adverse effects.