1. Mobile phone universal charging circuit diagram
The universal charging circuit diagram of the mobile phone is as follows:
principle
Ion batteries are widely used on mobile phones because of their small size, large capacity, light weight, no memory effect, no pollution, and many cycles of battery charge and discharge (long life). However, in actual use, many people will feel that the life of lithium-ion batteries is very short, and it will not be charged for a long time. In fact, it is caused by improper battery charging. Lithium-ion battery charging conditions are strict, charging control requires high precision, and the ability to withstand over-charging is poor. If it is charged by a general charger, it will be damaged due to over-charging. Therefore, the charger of a lithium ion battery must meet the charging characteristics of a lithium ion battery.
The charging process of the lithium-ion battery is carried out in two stages, firstly charging with constant current to 4.2V+0.05V, that is, transferring to the second stage of constant voltage of 4.2V±0.05V, and the constant voltage charging current will change with time. Gradually decrease, when the charging current drops to 0.1CmA, it indicates that the battery has been charged to 93% or 94% of the rated capacity. At this time, it can be considered as basically full. If it continues to charge, the charging current will gradually decrease to zero, and the battery is completely full. The constant current charging rate is 0.1CmA~1.5CmA (CmA: when the rated capacity of the battery is 1000mAh, the charging rate of 1.0CmA means the charging current is 1500mA, and so on). The standard charging rate is 0.5CmA. It takes about 2 hours to charge the battery voltage (discharge to 3.0V battery) to 4.2V, and then switch to constant voltage for about 1 hour to end charging. The entire charging process takes about 3 hours. When the charging rate is 1.5 CmA, the charging time of the first stage is only about 1/2 hour.
This charger mainly consists of three parts: constant current source, constant voltage source and battery voltage detection control.
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