To achieve fast charging and charging functions on mobile phones, three elements must be met, and the three are indispensable. Charger, battery, charge IC. The charger needs to meet enough output current and output voltage because the charger's trace has a large parasitic resistance. If a larger charging current is to be achieved, the charger's on-load output voltage needs to be higher.

 

 

 

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Fast charging of mobile phones is divided into three major categories: VOOC flash charging fast charging technology, Qualcomm Quick Charge 2.0 fast charging technology, MediaTek Pump Express Plus fast charging technology.

 

1, VOOC flash charge

 

There are two general directions for increasing the charging speed: one is to increase the voltage, and the other is to increase the current. Increasing the voltage will increase the amount of heat generated during the charging process, accelerate the aging of the battery and may pose a safety hazard, so the actual effect is not good. In contrast, increasing the current is more realistic. VOOC flash charging technology uses a low voltage and high current mode to ensure safety during charging.

VOOC flash charging and charging for 5 minutes for 2 hours, charging for 30 minutes can charge the phone's power from 0% to 75%.

 

2, Qualcomm Quick Charge 2.0

Qualcomm Quick Charge 2.0 technology is an upgraded version of Quick Charge 1.0 with new specifications. The charging speed is increased by simultaneously increasing the current and voltage.

 

3. MediaTek Pump Express Plus

 

MediaTek's fast charging technology, Pump Express, is built into the PMIC's power management IC. The charger is allowed to determine the initial voltage required for charging according to the current, and the pulse current command sent by the PMIC is transmitted to the charger through the Vbus of the USB.

 

The charger adjusts the output voltage according to this command, and the voltage gradually increases up to 5V to reach the maximum charging current.