Usb power pack charging Po charging management system design principles

by Wenfeng Zhou mobile power11 Mobile power, emergency charge commonly used by the built-in battery is a lithium-ion battery. The lithium-ion battery with a large capacity, small size, light weight, no memory effect. usb power pack supply, charging Po charge and discharge. Emergency mobile power of mobile phones, mobile phone recharge with the fact, the built-in lithium ion battery charging. The lithium-ion battery charging follow generally charging standard, the formulation of the charging standard determined by the characteristics of the work should be battery. The lithium-ion battery charging mechanism: Cathode lost electronics, lithium ion deintercalation into the solution; negative electrons, accumulation of lithium ions into negative carbon generated electricity solution. Therefore, the charging lithium ion embedded in the carbon layer is more, the greater the charge capacity. The mass of the positive electrode active material (lithium-ion content) determine the capacity of the battery. As charging progresses, the lithium-ion battery voltage stabilized at about 4.2V. There are two commonly used by the charging system of: 1 (20 - 5) under the conditions, 0.2C constant current charging, when the terminal voltage reaches the charge limit voltage instead of constant voltage charging until the charge current drops to 0.01C stop charging. 2 (20 -5) under the conditions, 1C charge reaches the charge limit voltage is changed to constant voltage charging until the charge current drops to 0.01C stop charging. The two ways to use constant current constant voltage mode, the only difference lies in the different charging current. Therefore, mobile power charger for iphone, mobile phone charging Po charging management system design principles but in reality is to achieve constant current and voltage of the built-in battery charging. Usually the charge management system of the work process is as follows: the battery voltage is less than the threshold voltage (typically 3V) in a precharge state, and a smaller current to charge the battery. After the battery voltage reaches the threshold voltage, the constant voltage constant current charging. Of course, there are different charging management mode, such as the pre-charging constant current charging and direct use of the constant voltage charging mode, the relatively long charging time of this mode.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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