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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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.

The charger provides a constant current, typically the maximum current that the charger is capable of producing. The voltage in the U o -phase is too high to be applied indefinitely hence, overvoltagebut it 417773 charging the battery fully in a relatively short time. Stage 2 is called the U o -phaseconstant-voltage boost stageabsorption stageor topping charge. The three phases are: I-phase constant electric currentUo-phase constant over- voltageand U-phase constant voltage.

Stage 3 is called the U-phase or float charge 417733the voltage is reduced to a value that is safe to be applied for rin periods weeks without significantly reducing the lifetime of the battery. The battery capacity C is expressed in Ah units, typically the C 20 value based on a hour discharge time.


From Wikipedia, the free encyclopedia. It consists of three phases or stagesto be executed by a battery charger.

An issue of continuity

This phase occurs when an IUoU charger is connected to a deeply discharged battery. This page was last edited on 24 Mayat During this phase, the charge current decreases gradually to a small residual value that compensates for any self-discharge of the battery. Retrieved from ” https: IUoU is a DIN -designation [1] DIN for a lead-acid battery charging procedure that is also known as 3-stage charging3-phase chargingor 3-step charging.

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 dinn decreasing.

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. Stage 1 is called the I-phaseconstant-current stageor bulk charge stage. The charger limits the maximum voltage to U maxa constant or temperature-dependent maximum, typically around 2. Batteries have varying numbers of cells typically six for an automotive battery and may be flooded-cell, absorbed-glass-matt AGM 4173, or gel-electrolyte types.


The decrease is imposed by the battery. Views Read Edit View history.

The U o -phase is concluded when the charge current goes below a threshold I minafter which the U-phase is entered. For the alternating-current system, see Three-phase electric power. As a result of the current, the battery absorbs the charge and its voltage rises. The charging current is a ddin between charging time favoring high currentsthe prevention of damage due to overheating or gassing favoring low currentsand cost of the charger favoring low currents.

IUoU battery charging – Wikipedia

In practice, it depends on the capability of the charger. 4173 voltage U o may be the same as U max in the previous stage, or it may be taken slightly higher.

The current in the I-phase stage 1 should be chosen depending on the capacity of the battery. By using this site, you agree to the Terms of Use and Privacy Policy. A bad battery will have short I-phase and Uo-phase, but there is a risk of gassingfurther damaging the battery.