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Basic knowledge of mobile phone charger
Mar 31, 2018

1, job function. Different types of batteries have different charging requirements, and chargers mainly have parameters such as charging method, charging current, and charging voltage.

1.1. Charging method: The charger of the rule is to charge the battery in a constant current method or in a constant voltage method. For current lithium-ion batteries that are used throughout, the charger's charging method should use a current limiting and constant voltage method, that is, it can be switched to constant voltage charging after the current is limited to the battery and the charging voltage is constrained.

1.2. Charging current: The maximum output current of the charger is ruled. The size of the charging current should match the size of the applicable battery, and should generally not exceed 1C5A.

1.3. charging voltage: rules the charger's maximum output voltage. The bump of the charging voltage depends on the battery's charge-constrained voltage; when charging a Li-Ion battery with a nominal voltage of 3.6V, the highest voltage output required by the charger is usually 4.2V (In practice, the lithium-ion batteries for mobile phones are equipped with maintenance. Device, so the output voltage of the charger can also be slightly higher than 4.2V, but in order to ensure safety, the voltage must not exceed 4.5V).


2. electromagnetic compatibility. For charger products, its electromagnetic compatibility requirements are primarily reflected in electromagnetic disturbances. Electromagnetic disturbance is divided into conduction disturbance and radiation disturbance. Because of the many advantages of switching power supplies, chargers are used throughout the switching power supply circuit. However, the high-frequency registration and closure of switching devices in switching power supplies generate high-frequency harmonic signals. These high-frequency signals are transmitted through the power grid through the power grid or through space radiation, which will bring electromagnetic pollution to the environment, disturbing the normal operation of the surrounding electronic equipment, and may severely adversely affect the safe operation of the power grid and human health. Therefore, in order to reduce the electromagnetic pollution of the environment, the power source terminal (or interface terminal) disturbing voltage and radiation disturbing field strength should be less than a certain limit when the electronic product is required to be operated. Regarding the battery charger for mobile phones, the disturbing voltage and the disturbing field strength should meet the requirements of Class B limits in the national mandatory standard GB9254-1998.


3.security needs. In a nutshell, the circuit layout, mechanical layout, and electrical function of demanding goods should meet certain security requirements regardless of whether the goods are in normal operating conditions or are abnormal (such as output overload or short circuit, internal component failure or circuit faults, etc.) The state of operations should not harm people and the safety of the industry. In order to achieve this intent, the security requirements of the charger's goods (such as protection against electric shock, insulation function, temperature, etc.) should meet the requirements of the national mandatory standard GB4943-2001.


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