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Float charge of battery

Floating charge is a power supply (discharge) mode of the battery pack. It connects the battery pack to the load circuit in parallel with the power line. Its voltage is generally constant, only slightly higher than the short-circuit voltage of the battery pack. The small amount of current supplied by the power line compensates for the loss of the local action of the battery pack, so that it can always maintain a satisfactory charging state without overcharging. Therefore, the battery pack can be charged and discharged as the power line voltage fluctuates up and down. When the load is light and the power line voltage is high, the battery pack is charged; when the load is heavy or the power supply is accidentally interrupted, the battery pack is discharged to share part or all of the load. In this way, the battery pack plays a role in voltage stabilization and is in standby mode.

The floating charge power supply mode can be divided into semi-floating charge and full-floating charge. The working mode in which floating charge is used for part of the time (heavy load) and the battery pack is used for power supply alone for the other part of the time (light load) is called semi-floating charge mode, or periodic floating charge mode. If the power supply is provided by the power line and the battery pack in parallel for floating charge all the time, it is called full floating charge working mode, or continuous floating charge working mode.

The life of the battery pack used in floating charge working mode is generally longer than that of the full charge and discharge working mode, and it can be replaced by a battery pack of smaller capacity. This floating charge power supply working mode is mostly used for power outage backup power supply of power plants and normal power supply of telephones in telephone exchanges.

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