Charger for charging at least one rechargeable energy storage unit
First Claim
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.
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Accused Products
Abstract
The invention relates to a charging device for charging at least one rechargeable energy storage unit, having a defined inner resistance and having a compensation circuit for the compensation of a voltage drop during the charging operation caused by the inner resistance. The compensation circuit has a current detection for detecting a charge current of the rechargeable energy storage unit and a voltage regulator for adjusting the charge voltage to the detected charge current. The charging device is characterized in that the compensation circuit has a voltage distributor between the current detector and the voltage regulator, by the dimensioning of which the compensation of the inner resistance is carried out.
12 Citations
10 Claims
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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.
Specification