mobile power supply, voltage, charging management in a portable device. The dielectric storage generally use lithium batteries, lithium batteries because the volume is relatively small, large capacity, wide market circulation, moderate price, is widely used in digital products. The battery voltage between 2.7-4.2V and voltage decreases with the decrease of electricity. While the 2.7-4.2V voltage is not directly to other digital products charge, because lithium voltage of digital products is 2.7-4.2V, the voltage between the same potential is not charging. So the mobile power output power is to boost system, the battery voltage boost 2.7-4.2V to 5V, so you can charge for other digital products, such as mobile phone, tablet computer, MP4, PSP etc..

Of course, the mobile power supply is not a one-time device, it can be used repeatedly hundreds of times. So when the mobile power supply is used, we must charge the mobile power supply. The principle and charging the phone. Connect to the USB 5V computer interface or USB charger to charge the mobile power supply. Therefore, the mobile power must also have a charging management system. Charging management system according to the battery voltage, automatically adjust the charging current. Process: pre charging, constant voltage charging and float charging, etc.. Here are the next components.

The power supply of the electric core: commonly used in lithium polymer, 18650 lithium, lithium iron phosphate battery, AAA battery.