At the end of June, a leaker revealed a picture of an Apple 20W charger. Except for the model A2305, the other parameters of the charger are exactly the same as those of the A2244 which just passed the 3C certification. The appearance and manufacturing process of the charger are very similar to the Apple 18W.
Apple’s 18W charger was first came on the iPad Pro. Although all iPhones after the iPhone 8 support PD fast charging, they are only equipped with a 5W charger. It is not until the iPhone 11 Pro series that the 18W PD charger is standard, and the fast charging power of the iPhone can reach up to 23W according to the different power of the series.
At present, iPhone fast charging adopts the “high voltage and low current” charging method. The technical principle is similar to QC2.0 many years ago. The charger outputs 9V high voltage into the mobile phone and then converts it to 4.4V required by the battery. The pressure drop is large and the efficiency is low. We tested the iPhone 11 Pro at an ambient temperature of 25 degrees, using Apple’s original 18W charger. The temperature of the iPhone is as high as 42.5 degrees. Because of the large pressure drop and low efficiency, the calorific value is criticized, which also limits the fast charging power. Promote.
At present, the power of the original Apple PD charger covers 18W, 29W, 30W, 61W, 87W, and 96W, of which 29W is delisted due to too little output voltage coverage, and replaced by a wider voltage coverage of 30W. Now the power of 20W charger is only increased by 2W, and the voltage coverage is the same as 18W. According to the division of Apple chargers for many years, it is impossible to launch new models just to increase a little power, so it is very likely that the 20W charger will support revolutionary Charging technology-charge pump charging.