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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It consists of three phases or stagesto be executed by a battery charger. For the alternating-current system, see Three-phase electric power. The purpose is to 4173 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.
Stage 3 is called the U-phase or float charge statethe voltage is reduced to a value that is safe to be applied for long periods weeks without significantly reducing the lifetime of dij battery.
From Wikipedia, the free encyclopedia. IUoU is a DIN -designation  DIN for a lead-acid battery charging procedure that dkn also known as 3-stage charging3-phase chargingor 3-step charging. Retrieved from ” https: 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.
Batteries have varying numbers of cells typically six for an automotive battery and may be flooded-cell, absorbed-glass-matt AGMor gel-electrolyte types.
In practice, it depends on the capability of the charger.
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 current in the I-phase stage 1 should be chosen depending on the capacity of the battery.
An issue of continuity
As a result of the current, the battery absorbs the charge and its voltage rises.
The charger limits the maximum voltage to U maxa constant or temperature-dependent maximum, typically around 2. The voltages in the U and U o phases stages 2 and 3 depend on the type of battery and the temperature.
In this stage, the battery is continued being charged at a constant over voltage U obut the charge current is decreasing. This page dn last edited on 24 Mayat This phase occurs when an IUoU charger is connected to a deeply discharged battery. Stage 2 is called the U o -phaseconstant-voltage boost stageabsorption stageor topping charge.
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A bad battery will have short I-phase and Uo-phase, but there is a risk of gassingfurther damaging the battery. The 4773 is imposed by the battery. The U o -phase is concluded when the charge current goes below a threshold I minafter which the U-phase is entered.
IUoU battery charging – Wikipedia
I-phase constant dn currentUo-phase constant over- voltageand U-phase constant voltage. 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.
The battery capacity C is expressed in Ah units, typically the C 20 value based on a hour discharge time.