DIN 41773 PDF
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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Stage 2 is called the U o -phaseconstant-voltage boost stageabsorption stageor topping charge. For the alternating-current system, see Three-phase electric power. 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 the battery. The charger limits the maximum voltage to U maxa constant or temperature-dependent maximum, typically around 2.
During this phase, the charge current decreases gradually to fin small residual value that compensates for any self-discharge of the battery.
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. Retrieved from ” https: The battery capacity C is expressed in Ah units, typically the C 20 value based on a hour discharge time. The voltage in the U o -phase is too high vin be applied indefinitely hence, overvoltagebut it allows charging the battery fully in a relatively short idn. 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.
As a result of the current, the battery absorbs the charge and its voltage rises. The current in the I-phase stage 1 should be chosen depending on the capacity of the battery. A bad battery will have short I-phase and Uo-phase, but there is a risk of gassingfurther damaging the battery.
It consists of three phases or stagesto be executed by a battery charger.
IUoU battery charging – Wikipedia
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 dni to the battery capacity. The voltages in the Fin and U o phases stages 2 and 3 depend on the type of battery and the temperature. This page was last edited on 24 Mayat This phase occurs when an IUoU charger is connected to a deeply discharged battery. From Wikipedia, the free encyclopedia.
IUoU battery charging
In this stage, the battery is continued being charged at a constant over voltage U obut the charge current is decreasing. 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 charging current is a compromise between charging time favoring high currentsthe prevention of damage due to overheating dim gassing favoring low currentsand cost of the charger favoring low currents. I-phase constant electric currentUo-phase constant over- voltageand U-phase constant voltage. The voltage U o may be the same as U max in the previous stage, or it may be taken slightly higher.
The U o -phase is concluded when the charge current goes below a threshold I minafter which the U-phase is entered. The three phases are: The charger provides a constant current, typically the maximum current that the charger is capable of producing.