The difference between fast charge and flash charge is:
1, the charging speed is not the same, flash charging is faster.
2, the voltage is not the same when charging, flash charging is low voltage fast charging, fast charging is high voltage fast charging.
3, the heating degree of the mobile phone is not the same when charging, the flash charging temperature is low, and the fast charging temperature is high.
4, the security of the mobile phone is not the same when charging, flash charging is safer.
Now fast charging is basically divided into two categories:
1, low voltage fast charge: represents OPPPO VOOC flash charge.
2, high voltage fast charge: are Qualcomm's universal free program, on behalf of MOTO turbo fast charge, Vivo dual engine flash charge, the basic Qualcomm chip also supports fast charge.
Low voltage and high current mode: in the case of a certain voltage, increase the current, you can use the parallel circuit to shunt, under constant voltage, the smaller the pressure shared by each circuit after the parallel shunt, and the same processing in the mobile phone, the smaller the pressure endured by each circuit.
High voltage constant current mode: The charging process of the general mobile phone is to first reduce the 220V voltage to 5V charger voltage, 5V charger voltage and then to 4.2V battery voltage. During the whole charging process, if the voltage is increased, heat energy is generated, so when charging, the charger will heat up, and the phone will heat up. And the greater the power consumption, the greater the damage to the battery.
VOOC flash charging technology belongs to low voltage and high current fast charging, and other fast charging belongs to high voltage and low current fast charging. High voltage charging, mobile phone temperature is relatively high, relatively speaking, VOOC flash charging security is very high.
Therefore, the damage to the mobile phone battery and the motherboard of the vooc flash charge is much smaller than that of the high-voltage fast charge
High voltage charging is faster than low voltage charging. Since a battery needs to be charged after discharge, its internal resistance is already in a stable state. At this time, the higher the DC voltage to charge it, the greater the charging current, and the more energy is charged into the battery per unit time. The faster the energy in the battery increases, so the higher the charging voltage, the faster the charging speed.
High voltage charging
To increase the voltage, it is necessary to design multiple buck circuits in the charging circuit. The charging process of the general mobile phone is to first reduce the 220V civil voltage to the 5V charger voltage, and then the 5V charger voltage is reduced to 4.2V battery voltage. There are step-down circuits in both the charger and the phone circuit, so when charging, the charger will heat up, and the phone will heat up. Heat brings a bad experience and affects the safety of the battery.
Low-voltage charging
The current is increased, and the MCU MCU is introduced in both the charger circuit and the battery circuit to replace the step-down circuit. Under the premise of low voltage and high current, the output of segmented cross current is realized by opening voltage loop. The solution of using low voltage and high current not only ensures the safety of the aviation grade, but also solves the problem of charging heat of the mobile phone in an unprecedented way, whether it is the adapter or the mobile phone will not heat up when charging.