CN-122003611-A - Device for measuring current flowing through an electrical conductor and charging device for an electric vehicle

Abstract

An apparatus for measuring a current flowing through an electrical conductor is disclosed, having a measuring device arranged in the vicinity of the electrical conductor, which detects a magnetic field generated by the current, wherein the measuring device has a magnetic sensor device which detects the magnetic field in at least two orthogonal spatial directions, wherein the magnetic sensor device has a magnetic field-sensitive transducer or sensor assigned to the at least two orthogonal spatial directions, wherein the current can be determined from the measured values detected by the magnetic sensor device.

Inventors

• M. Stoll

Assignees

• AST(先进传感器技术)国际资产有限公司

Dates

Publication Date

20260508

Application Date

20241010

Priority Date

20231010

Claims (11)

1. 1. An apparatus for measuring a current flowing through an electrical conductor, the apparatus having a measuring device arranged in the vicinity of the electrical conductor, which measuring device detects a magnetic field generated by the current, wherein the measuring device has a magnetic sensor device which detects a magnetic field in one spatial direction or in two or three orthogonal spatial directions, wherein the magnetic sensor device has a magnetic field-sensitive transducer or sensor assigned to one spatial direction or to a plurality of spatial directions, wherein the current can be determined from the measured values detected by the magnetic sensor device.
2. 2. The device according to claim 1, wherein two or three transducers or a plurality of transducers are provided, which are magnetically sensitive with respect to one spatial direction or two or three orthogonal spatial directions, respectively.
3. 3. The device of claim 1 or 2, wherein the or the respective converter is a circuit-integrated hall effect sensor having sensor elements in one or two or three orthogonal spatial directions.
4. 4. Apparatus according to any preceding claim, wherein the or a corresponding converter has a temperature sensor.
5. 5. The apparatus according to any of the preceding claims, wherein the measuring device has a control unit, wherein the control unit has an algorithmically constructed kalman filter, which is provided for filtering the measured values of the converter and/or the intermediate values of the converter and forming measurement data.
6. 6. The device according to any of the preceding claims, wherein the measuring means has a circuit board on which the converters are arranged on a circuit board side, wherein the electrical conductors in the form of bus bars are arranged opposite the circuit board side, through which the current to be measured can flow, wherein the bus bars have two large sides facing away from each other, wherein one large side is arranged opposite the circuit board, wherein the bus bars have a constriction in the main flow direction of the current, wherein at least one converter or at least two converters or more converters are arranged in the region of the constriction to detect the magnetic field lines in the region of the constriction.
7. 7. The apparatus of any one of the preceding claims, wherein the measuring device has a voltage measurer to detect a voltage, wherein the voltage measurer is configured as an analog-to-digital converter.
8. 8. An apparatus according to any one of the preceding claims, wherein the apparatus has application means arranged to transfer data between the measurement means and the application apparatus.
9. 9. The apparatus of claim 8, wherein the application device has a control unit arranged to encrypt data transmitted to the application device.
10. 10. A charging device for an electric vehicle, the charging device having a device according to any one of the preceding claims.
11. 11. A method with which a measurement is performed by means of the apparatus according to any one of claims 1 to 9, wherein a measured value of the magnetic field of the electrical conductor is detected by means of the converter/converters of the measuring device, wherein a current value is determined by means of a kalman filter on the basis of the measured value.

Description

Device for measuring current flowing through an electrical conductor and charging device for an electric vehicle Technical Field The present invention relates to a device for measuring the current flowing through an electrical conductor and a charging device for an electric vehicle according to the preamble of claim 1. Background In a charging device for an electric vehicle, for example, a charging pile, charging is performed using direct current. Where it is necessary to detect the energy transmitted. Disclosure of Invention The object of the invention is to provide a device for measuring the current flowing through an electrical conductor in a manner that is simple in terms of device technology. The invention is based on the object of providing a charging device for an electric vehicle, which is simple in terms of device technology and enables reliable measurements. Furthermore, an advantageous method for measuring the current should be provided. The respective task is solved according to the features of the respective claims 1, 10 and 11. Advantageous developments of the invention are the subject matter of the dependent claims. According to the invention, a device for measuring the current flowing through an electrical conductor is provided. The device has a measuring means arranged adjacent to the electrical conductor, which measuring means detects the magnetic field generated by the current. The measuring device has a magnetic sensor device which detects a magnetic field in at least one or two or three or more, in particular orthogonal, spatial directions. The magnetic sensor device has one or more magnetic field-sensitive transducers or sensors assigned to at least one or two or three or more orthogonal spatial directions. The current can be determined from the measured values detected by the magnetic sensor device. Advantageously, a current in the form of direct current can be detected by this arrangement in both flow directions. With this embodiment, the current can be determined in a contactless manner, which results in a larger measuring range than is possible with current measurement using a shunt or a parallel resistor. The measurement range is for example between 100 mA and 1000A. Preferably, dreMaS (three-dimensional magnetic field sensor) is provided as a transducer or a corresponding transducer. Preferably, two or three transducers are used for current measurement to obtain a high accuracy and reliable measurement. The transducer measures the magnetic field generated by the current so that the current strength can be deduced therefrom. The respective converter is preferably a linear, in particular circuit-integrated hall effect sensor or an IC (ic=integrated circuit) hall effect sensor. The hall effect sensor advantageously has one or more (preferably three) sensor elements or (preferably three) hall elements in one or more (preferably three) dimensions (X/Y/Z sensors). With the aid of this hall effect sensor or a corresponding hall effect sensor, preferably three spatial components of the magnetic field can be measured at the same location. For example, in the case of multiple transducers, the transducers are oriented identically. By means of at least three converters, which are each configured as an IC hall effect sensor, for example, two converters can be used for measuring the magnetic field for current measurement and one converter can be used for detecting the interference field. According to a preferred embodiment of the invention, the converter or the corresponding converter further comprises a temperature sensor, which is preferably integrated in the IC hall effect sensor. In other words, the temperature sensor is located near and/or in close proximity to and/or adjacent to one or more hall elements, especially inside the IC hall effect sensor. The temperature can thus be detected directly in the measuring range and simultaneously in time and space with the current measurement. In other words, temperature measurements can thereby be made at exactly the same time and at exactly the same place as the current measurements. The measurement results of the magnetic field and the measurement results of the temperature measurement can be forwarded as common values, which simplifies further processing and results in relatively low computational effort. By means of accurate temperature considerations, for example, temperature-corrected measurements can be made. Extremely accurate measurements can be achieved if each transducer has a temperature sensor. According to a preferred embodiment of the invention, the converter or the corresponding converter comprises a low-noise amplifier, in particular with a settable offset. Preferably, the converter or the respective converter has a configurable digitizer control unit for the measurement process, in order to control the measurement process and/or calibrate the measurement process, for example independently of an upper control unit. It is further p