Two-way fast charging means that both output and input support fast charging; The output supports fast charging, that is, when the charging treasure charges the mobile phone, the charging treasure and the mobile phone support fast charging, and the input supports fast charging, that is, when the charging treasure charges the charger and the charging treasure support fast charging. At present, the charging speed is generally 5V, 2A is the base benchmark, the charging power exceeds 5V, 2A is the concept of fast charging, in principle, it is also divided into two directions of pulling high voltage and increasing current.
2, the mobile phone to achieve fast charging function needs to meet the three elements, the three are indispensable, charger, battery, charge IC. The charger needs to meet sufficient output current and output voltage, because the charger line has a large parasitic resistance, if you want to achieve a large charging current, the on-load output voltage of the charger needs to be higher.
3, the charger according to the design circuit operating frequency to be divided into power frequency machine and high frequency machine. The power frequency machine is designed based on the traditional analog circuit principle, the internal power devices of the machine are larger, and there is generally less noise when the load is larger, but the model has strong resistance performance in the harsh grid environmental conditions, and the reliability and stability are stronger than the high-frequency machine.