Mobile phone charger measure

        Charger product quality is good or bad from its performance, safety requirements and electromagnetic compatibility of three aspects to measure.
A performance. Different types of batteries have different charging requirements, charger charging, the charging current, charging voltage parameters required.

(1) charge: to require a charger is a constant current or constant voltage to charge the battery. The current widespread use of lithium-ion battery charger charging current limiting constant voltage, that is the first limiting charge to the battery limits the charging voltage can be automatically converted to constant voltage charging.

(2) Charging current: specifies the maximum charger output current. The size of the charge current should be applicable to the capacity of the battery size to match the generally should not exceed 1C5A.

(3) The charging voltage: specifies the maximum charger output voltage. Charging voltage depends on the battery charge voltage limit; the nominal voltage of 3.6V Li-Ion battery charging, requiring the maximum charger output voltage is generally 4.2V (in fact, cell phone use lithium-ion batteries are fitted with a protective device, so the output voltage of the charger may be slightly higher than 4.2V, but in order to ensure safety, the voltage shall not exceed 4.5V).

2, the safety requirements. Popular terms is to ask the circuit structure of the product, the mechanical structure and electrical properties to meet certain safety requirements, regardless of the product in the normal operation or abnormal (such as output overload or short circuit, the internal component failure or circuit failure, etc.) state, should not endanger the safety of persons and property. To achieve this, the charger product safety requirements (such as electric shock protection performance, insulation performance, temperature, etc.) should be consistent with the requirements of the national mandatory standard GB4943-2001.

3, electromagnetic compatibility. Charger products, electromagnetic compatibility requirements reflected in the electromagnetic disturbance. Electromagnetic disturbance into the conducted disturbances and radiated disturbances. Due to the many advantages of switching power supply, so the charger universal switching power supply circuit. But the high-frequency switching power supply switching device in opening and closing, will produce high-frequency harmonic signal. These high-frequency signals transmitted through the grid through the power terminals or by space radiation, will give the environment electromagnetic pollution, harassment around the electronic equipment to work properly, serious may be on the safe operation of power grids and human health have adverse effects. Therefore, in order to reduce the electromagnetic pollution of the environment, requires electronics power supply terminals (or interface terminals) harassment voltage and radiated disturbance field strength should be less than a certain limit. For cell phone battery charger, of harassment voltage and the disturbance field strength should be consistent with the requirements of the national mandatory standard GB9254-1998 Class B limits.


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