Mobile phone chargers (also called mobile phone adapters) are composed of a stable power supply (mainly regulated power supply, providing stable working voltage and sufficient current) plus necessary control circuits such as constant current, voltage limiting, and time limiting.

The output parameters marked on the mobile phone charger (referring to the line charger): such as output 5.0V/1A, output 5.0V/1500mA-11200... refers to the relevant parameters of the internal regulated power supply. Understand this truth, you will know that a (good quality) mobile phone charger is easy to change into a good quality regulated power supply!

The mobile phone lithium-ion battery charger adopts a constant current and voltage-limited charging system, and the charging current generally adopts C2 (referring to the battery capacity when the battery is discharged in 2 hours, generally marked on the battery) - that is, it takes two hours to charge. For example, a 500mAh battery is charged at 250mA, and it is charged at a constant voltage after reaching 4.2V in about two hours.

Li-Ion batteries are not suitable for fast charging using the -DV/DT detection method used by NIMH battery advanced fast chargers, because Li-Ion batteries have strict limitations on charging current. Lithium ions (Li+) are very active, and high-current charging can be dangerous.

People who have a little understanding of electronics remember the traditional big transformer, which realizes the transformation of AC voltage through the turns ratio of the primary and secondary coil windings of the transformer, and then realizes it through bridge rectification, voltage stabilization and filtering, and even through voltage stabilization chips. constant voltage output.

A problem with traditional chargers is that the transformer must be very large, and the electrical energy is converted into magnetic energy for transmission. In order to transmit enough power electrical energy, more turns are required to generate enough magnetic energy to complete the high-power voltage. transform. Therefore, the larger the required output current, the larger the size of the transformer.

So why are the current chargers so small?

The mobile phone charger uses a switching power supply, which also has a transformer, so why can this transformer be so small compared to the traditional transformer? This is because the switching power supply can keep the transformer small while meeting the power requirements by increasing the frequency of the alternating current on the transformer. This feature is very suitable for the needs of modern electronic equipment.

Therefore, there are still transformers in the current mobile phone chargers. The difference is the high-frequency transformer. The same is that the output terminal and the 220V electricity are still electromagnetically isolated.

The charger itself has little technical content, and the biggest constraint is cost, and the virtual current standard is the commonality of almost all cottage chargers. The charger does not necessarily have to buy the original, but must buy the regular manufacturer. Ordinary mobile phones must have a current output of more than 1A, and tablet computers such as iPads must buy a current output of 2A or more. High-current chargers can be used on low-current devices, so the iPad's 2A charger can charge 1A iPhones and other mobile phones without problems.

SaiYue Technology Co., Ltd. is a mobile phone accessory solution provider that integrates design, research and development, production, sales and service with mobile phone chargers as its core. SaiYue Technology supports two cooperation modes of ODM/OEM for electronic products such as chargers. The products are of good quality and complete models. It has developed into a long-term strategic partnership with some regional distributors and agents.