For Huawei P20 P30 Lite USB Charger 5V 2A EU Power Adapter

Mobile phone chargers can be roughly divided into travel chargers, seat chargers and maintenance chargers. The first two types are mainly used by ordinary users. Travel chargers are the most popular ones on the market.
Travel chargers also come in a variety of forms, including cheap duck egg mini travel chargers, ordinary desktop card chargers, and high-end desktop chargers with LCD displays.
Mobile phone charger, also known as mobile phone adapter, is actually composed of a stable power supply (mainly a regulated power supply, providing stable working voltage and sufficient current) plus necessary constant current, voltage limit, time limit and other control circuits. The output parameters marked on the charger (referring to the line charger): such as 5.0V/1A output, 5.0V/1500mA-11200 output... refer to the relevant parameters of the internal regulated power supply. With this understanding, you will know that a (high-quality) mobile phone charger can easily be changed into a high-quality regulated power supply.
The charger of commonly used lithium-ion battery for mobile phones adopts the constant current voltage limiting charging system, and the charging current is generally about C2, that is, the two-hour charging rate is adopted. For example, the 500mAh battery is charged to 4 by 250mA in about two hours. Charge at constant voltage after 2V.
Lion battery is not suitable for the use of the fast charging mode of DV/DT detection used by NIMH battery advanced fast charger, because Lion battery has strict restrictions on the charging current. Lithium ion (Li+) is very active, and high current charging is easy to occur
Mobile phone chargers can be roughly divided into travel chargers, seat chargers, USB chargers and maintenance chargers. The latest one is mobile phone case chargers.
The overall appearance of the phone case charger is no different from that of the ordinary phone case. The phone case is slightly thicker than the ordinary phone case. With 2300mAh battery capacity, it can provide complete one-time charging, and lithium battery cell or dry battery is generally used as the storage unit.
General users mainly contact the first two. Travel chargers are the most popular ones in the market, and there are many forms of travel chargers, including cheap duck egg mini travel chargers, ordinary desktop card chargers, and high-end desktop chargers with LCD displays. Since the majority of mobile phone users are non professional users, the chargers basically have the function of full automatic stop, and most travel chargers are fast chargers, with the charging time of about 1-3 hours. Many chargers on the market advertise that they use microcomputer control, including some very cheap duck egg type mini travel chargers. In fact, strictly from the perspective of charging circuit, only a small number of chargers can be truly controlled by microcomputer (single microcomputer control).
Emergency charger Mobile phone charger
Some manufacturers call themselves "microcomputer control" when they use integrated blocks on the charging circuit. In fact, many low-cost designs use low-cost op amp integrated blocks, while some special charging control integrated blocks have higher unit prices and are generally used in high-end or famous brand chargers. So we can't trust the so-called microcomputer control, especially the cheap products. Many products have similar appearance but different internal circuits and different performance.