Patent ID: 8648563
Filing Date: 2014-02-11
Classification: H02J

Abstract:
1. A charger for charging at least one rechargeable energy storage unit, having a defined internal resistance and having a compensation circuit for compensating for a voltage drop brought about by the internal resistance during a charging operation, in which the compensation circuit has a current detector which detects a charging current of the rechargeable energy storage unit and a voltage regulator for influencing the charging voltage as a function of a detected charging current, the compensation circuit including a voltage divider, which is disposed between the current detector and the voltage regulator and by way of the dimensioning of the voltage divided the compensation for the internal resistance is effected, wherein the voltage divider is connected on one side to a reference voltage and on another side to an output of the current detector, and a center pickup of the voltage divider is connected to at least one input of the voltage regulator, wherein the charger is not bound to either one of a (i) defined maximum charging voltage value and (ii) maximum current limit value for the compensation, wherein the compensation for the voltage drop occurs only when the charging current is flowing, wherein the voltage regulator has an operational amplifier, whose inverting input is connected to a center pickup of the voltage divider and whose noninverting input is connected to a center contact of a further voltage divider, and the further voltage divider is located between a power supply line of the rechargeable energy storage unit and an electrical ground and furnishes an actual signal of the charging voltage of the rechargeable energy storage unit.