Method for determining a load current and battery sensor
First Claim
Patent Images
1. A method for determining a load current flowing through a group of measuring resistors, the group of measuring resistors has a number of branches and each branch has at least one respective first measuring resistor connected to at least one respective second measuring resistor at a connection point that is connected to a reference resistor, wherein the method comprises for each of the branches:
- measuring a first measurement voltage, which is dropped across the first measuring resistor in response to the load current, and a second measurement voltage, which is dropped across the second measuring resistor in response to the load current,calculating a first operating parameter on the basis of the first measurement voltage and the second measurement voltage,calibrating each branch of the group of measuring resistors during respective calibration periods, wherein the method comprises solely during the 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 the calibration current flows through the reference resistor to the connection point, andmeasuring a first calibration voltage, which is dropped across the first measuring resistor in response to the case of a flowing first calibration partial current and the load current, and a second calibration voltage, which is dropped across the second measuring resistor in response to the flowing second calibration partial current and the load current,wherein a 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.
1 Assignment
0 Petitions
Accused Products
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.
34 Citations
18 Claims
-
1. A method for determining a load current flowing through a group of measuring resistors, the group of measuring resistors has a number of branches and each branch has at least one respective first measuring resistor connected to at least one respective second measuring resistor at a connection point that is connected to a reference resistor, wherein the method comprises for each of the branches:
-
measuring a first measurement voltage, which is dropped across the first measuring resistor in response to the load current, and a second measurement voltage, which is dropped across the second measuring resistor in response to the load current, calculating a first operating parameter on the basis of the first measurement voltage and the second measurement voltage, calibrating each branch of the group of measuring resistors during respective calibration periods, wherein the method comprises solely during the 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 the calibration current flows through the reference resistor to the connection point, and measuring a first calibration voltage, which is dropped across the first measuring resistor in response to the case of a flowing first calibration partial current and the load current, and a second calibration voltage, which is dropped across the second measuring resistor in response to the flowing second calibration partial current and the load current, wherein a 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, 14, 15, 16)
-
-
13. A battery sensor, comprising:
-
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 connected to at least one respective second measuring resistor at a connection point that is connected to a reference resistor, at least one first voltmeter and one second voltmeter, wherein the first voltmeter is configured to measure a voltage dropped across the first measuring resistor in response to a load current, and the second voltmeter is configured to measure a voltage dropped across the second measuring resistor in response to the load current, at least one calibration current source which is configured to conduct a calibration current through the group of measuring resistors, and an electronic control apparatus which is configured to calibrate each branch of the group of measuring resistors during respective calibration periods, wherein the calibration comprises solely during the 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 the calibration current flows through the reference resistor to the connection point and measuring a first calibration voltage, which is dropped across the first measuring resistor in response to the first calibration partial current and the load current, and a second calibration voltage, which is dropped across the second measuring resistor in response to the second calibration partial current and the load current, wherein a 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 (17, 18)
-
Specification