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.