This specification does not concern legal or safety standards. 26/11/, 1/3. 1 Charging characteristic: IUa (according to DIN ). Regime. Switching. transformer, input PF , low input harmonics (DIN (UI). Find the most up-to-date version of DIN at Engineering
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IUoU battery charging – Wikipedia
The voltage in the U o -phase is too high to be applied indefinitely hence, overvoltagebut it allows charging the battery fully in a relatively short time. The charger provides a constant current, typically the maximum current that the charger is capable of producing. The voltages in the U and U o phases stages 2 and 3 depend on the type of battery and the temperature. The charging 4177 is a compromise between charging time favoring high currentsthe prevention of damage due to overheating or gassing favoring diin currentsand cost of the charger favoring low 417733.
If a battery is connected to a significant load during charging, the end of the Uo-phase may never be reached and the battery will gas and be damaged, depending on the charge current relative to the battery capacity.
An issue of continuity
Stage 1 is called the I-phaseconstant-current stageor bulk charge stage. During this phase, the charge current decreases gradually to a small residual value that compensates for any self-discharge of the battery. The voltage U o may be the same as U max in the previous stage, or it may be taken slightly higher. As a result of the current, the battery absorbs the charge and its voltage rises.
The three phases are: Retrieved from ” https: The charger limits the maximum voltage dib U maxa constant or temperature-dependent maximum, typically around 2. Stage 3 rin called the U-phase or float charge statethe voltage is reduced to a value that is safe to be applied for long periods weeks dln significantly reducing the lifetime of the battery.
The purpose is to fully charge the battery in a relatively short time without reducing its life span and to indefinitely keep the battery charged as long as the charger is connected. For the alternating-current system, see Three-phase electric power. This phase occurs when an IUoU charger is connected to a deeply discharged battery.
A bad battery will have short I-phase and Uo-phase, but there is a risk of gassingfurther damaging the battery. Stage 2 is called the U o -phaseconstant-voltage boost stageabsorption stageor topping charge.
Batteries have varying numbers of cells typically six for an automotive battery and may be flooded-cell, absorbed-glass-matt AGMor gel-electrolyte types. The current in the I-phase stage 1 should be chosen depending on the capacity of the battery.
The battery capacity C dun expressed in Ah units, typically the C 20 value based on a hour discharge time.
IUoU battery charging
In practice, it depends on the capability of the charger. It consists of three phases or stagesto be executed by a battery charger.
I-phase constant electric currentUo-phase constant over- voltage djn, and U-phase constant voltage. IUoU is a DIN -designation  DIN for a lead-acid battery charging procedure that is also known as 3-stage charging3-phase chargingor 3-step charging.