METHOD FOR DETERMINING A LOAD CURRENT AND BATTERY SENSOR
First Claim
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1. A method for determining a load current (Iload) flowing through a group of measuring resistors,wherein the group of measuring resistors has a number of branches and each branch has at least one respective first measuring resistor and one respective second measuring resistor,wherein the method comprises for each of the branches:
- measuring a first measurement voltage, which is dropped across the first measuring resistor, and a second measurement voltage, which is dropped across the second measuring resistor,calculating a first, operating parameter on the basis of the first measurement voltage and the second measurement voltage,wherein the method comprises solely during respective calibration periods;
conducting a calibration current into the branch of the group of measuring resistors, wherein the calibration current is divided into a first calibration partial current flowing through the first measuring resistor and a second calibration partial current flowing through the second measuring resistor, andmeasuring a first calibration voltage, which is dropped across the first measuring resistor in the case of a flowing calibration current and load, current, and a second calibration voltage, which is dropped across the second measuring resistor in the case of a flowing calibration current and load current,wherein the second operating parameter is calculated on the basis of at least the first calibration voltage, the second calibration voltage, the first operating parameter and a current intensity of the calibration current.
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Abstract
The invention relates to a method for determining a load current, which is based on conducting a calibration current in a particular manner and on particular calculation methods.
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18 Claims
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1. A method for determining a load current (Iload) flowing through a group of measuring resistors,
wherein the group of measuring resistors has a number of branches and each branch has at least one respective first measuring resistor and one respective second measuring resistor, wherein the method comprises for each of the branches: -
measuring a first measurement voltage, which is dropped across the first measuring resistor, and a second measurement voltage, which is dropped across the second measuring resistor, calculating a first, operating parameter on the basis of the first measurement voltage and the second measurement voltage, wherein the method comprises solely during respective calibration periods; conducting a calibration current into the branch of the group of measuring resistors, wherein the calibration current is divided into a first calibration partial current flowing through the first measuring resistor and a second calibration partial current flowing through the second measuring resistor, and measuring a first calibration voltage, which is dropped across the first measuring resistor in the case of a flowing calibration current and load, current, and a second calibration voltage, which is dropped across the second measuring resistor in the case of a flowing calibration current and load current, wherein the second operating parameter is calculated on the basis of at least the first calibration voltage, the second calibration voltage, the first operating parameter and a current intensity of the calibration current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification