CN116235059A - Sensor for detecting current flowing through conductor - Google Patents
Sensor for detecting current flowing through conductor Download PDFInfo
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- CN116235059A CN116235059A CN202180061280.5A CN202180061280A CN116235059A CN 116235059 A CN116235059 A CN 116235059A CN 202180061280 A CN202180061280 A CN 202180061280A CN 116235059 A CN116235059 A CN 116235059A
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- field sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
- G01R15/148—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop involving the measuring of a magnetic field or electric field
Abstract
A sensor (10) for detecting a current (14) flowing through a conductor (12) is presented. The sensor (10) comprises: -a first magnetic field sensor (16) configured for detecting a magnetic field generated by the conductor (12), wherein the first magnetic field sensor (16) is configured for outputting a first signal based on the detected magnetic field, the first signal showing a current flowing through the conductor (12); a second magnetic field sensor (22) configured to detect a magnetic field generated by the conductor (12), wherein the second magnetic field sensor (22) is configured to output a second signal based on the detected magnetic field; and an evaluation circuit (24) on an evaluation circuit board (26), wherein the first magnetic field sensor (16) and the second magnetic field sensor (22) are connected to the evaluation circuit (24), wherein the first signal and the second signal can be detected by the evaluation circuit (24), wherein the evaluation circuit (24) is configured to evaluate the first signal for plausibility using the second signal.
Description
Background
Current sensors are used in many technical fields. This type of sensor detects the current flowing through the conductor.
The invention is described in the context of a sensor for detecting a current flowing through a conductor in the field of motor vehicle technology in a manner that is not limited thereto. An electrical energy storage is used in a vehicle having at least part of an electrical drive in order to store electrical energy for an electric motor that supports the drive or serves as the drive. In the latest generation of vehicles, so-called lithium ion batteries are used here. However, the present invention is independent of the manner in which the electrochemical energy storage device is constructed.
Current sensors for electrified drivetrains are used for energy balance or monitoring performance. However, the invention is particularly not only applicable to battery current sensors suitable for high voltages, which monitor mainly the State of Charge (SOC) of the traction battery in electrified vehicles. The correct calculation of SOC is safety-related. Also, over-current identification is safety-related and an important task for current sensors. Applications of the invention in other fields, such as measuring inverter currents or currents in DC/DC converters, are equally contemplated. As such, the invention may be used outside of electrified drives or in other industries (e.g., industrial sensors, aerospace, or medical technology).
Typically, the signal plausibility check is not performed by a separate signal within the sensor. However, internal, redundant signal analysis processing is known in the art. In this case, the processing signal is analyzed redundantly by means of exactly one physical (measuring) transducer. In most cases, the direct current is measured using a resistance-based method (shunt) or a magnetic field sensor, such as hall or xMR. The generic term xMR includes all known magnetoresistive methods. In addition, so-called Frst probes, also known as fluxgate sensors, constitute a measurement principle that has been established for current measurement in bulk applications. All the methods mentioned are equally suitable for measuring alternating fields or associated magnetic fields of a direct current conductor. All the methods mentioned, except for the resistance-based measurement, are magnetic field-based methods, which work without contact.
For cost reasons, the construction of such sensors is generally carried out by means of exactly one measurement principle (cost) optimized for the respective application. However, in the event of a sensor error, it cannot be ensured that the erroneously output sensor signal is recognized by an upper-level system (for example, a sensor). Depending on the overall system configuration, it may be necessary to implement false identification from the point of view of functional safety (see ISO 26262). This type of identification can be achieved, for example, by signal plausibility checking. For higher security levels (especially ASIL-D), this in turn requires at least two independent signals, which must be identical within a predefinable tolerance. In the case of large deviations, the error signal is diagnosed and reported to the superordinate system so that a safe state can be assumed.
Despite the advantages of the sensors known from the prior art, these sensors still have the potential for improvement. According to the prior art, such a plausibility check, if any, is performed by means of a separate current sensor, which is cost-intensive. The combination with the direct (resistance-based) measurement principle described in the previous paragraph is known, however, with various drawbacks. However, many vehicle models on the market do not have a plausibility check of the current sensor signal at the physical level of the sensor. The safeguards may be resolved at the system level. However, it is foreseeable that future sensors themselves place higher demands from the point of view of functional safety according to ISO 26262. Thus, the plausibility check inside the sensor is an important aspect. In the latter prior art, the provision of a measuring resistor is costly, since the measuring resistor has to be integrated into the electrical conductor and the detection of the magnetic field of the measuring resistor is susceptible to disturbances. Also, the high voltage safety in the direct method is more expensive than the indirect, contactless magnetic principle due to the voltage separation that needs to be provided.
Disclosure of Invention
A sensor for detecting a current flowing through a conductor is therefore proposed, which avoids the disadvantages of the known sensors at least to a large extent and which in particular allows a plausibility check of the sensor interior of a magnetic field-based sensor for current measurement by means of a second, yet different, magnetic field-based sensor signal. The plausibility check is carried out in the sensor, for example, by comparing the absolute deviation or the relative deviation of the two signals within certain tolerance limits. Significant deviations lead to the detection of sensor errors and to output signals which lead to the use of safe states in higher-level systems (e.g., controllers).
The sensor for detecting a current flowing through a conductor according to the present invention comprises: a first magnetic field sensor configured to detect a magnetic field generated by the conductor, wherein the first magnetic field sensor is configured to output a first signal based on the detected magnetic field, the first signal indicative of a current flowing through the conductor; a second magnetic field sensor configured to detect a magnetic field generated by the conductor, wherein the second magnetic field sensor is configured to output a second signal based on the detected magnetic field; and an evaluation circuit on the evaluation circuit board, wherein the first magnetic field sensor and the second magnetic field sensor are connected to the evaluation circuit, wherein the first signal and the second signal can be detected by the evaluation circuit, wherein the evaluation circuit is designed to check the plausibility of the first signal using the second signal.
The current flowing through the conductor is accordingly indirectly detected not only by the first magnetic field sensor but also by the second magnetic field sensor. In this way, the first magnetic field sensor measures or detects the magnetic field of the conductor, which is superimposed on the magnetic field of the first magnetic field sensor. From the superimposed alternating fields, the main magnetic field of the conductor, which may also be referred to as main conductor, and thus the main current through the conductor, can be deduced. The voltage drop generated by the superimposed magnetic field, for example, over the measuring resistor, can be converted into a current which, with the number of windings included, is proportional to the main conductor current to be measured. The magnetic field of the conductor, which is generated by the main current to be measured, can be detected simultaneously by an independent second magnetic field sensor. The secondary sensor may operate, for example, according to the hall principle or the xMR principle. For cost optimization purposes, lower accuracy or higher interference sensitivity can be tolerated. Thus, the magnetic field of the conductor can be detected on two physically separate paths, which is proportional to the current to be measured.
The first magnetic field sensor, for example in the form of a Frst detector, can have a magnetic core and a coil surrounding the magnetic core, wherein the coil is designed to generate a magnetic alternating field, wherein the first signal is a superposition of an induced voltage and an applied voltage. The coil generates a magnetic alternating field which is superimposed on the magnetic field to be measured of the main conductor. By means of the non-linear magnetization change of the core and the changing inductance in the saturated state, the main magnetic field and thus the main current can be deduced from the superimposed alternating field. If, for example, a Frst probe is used as the main measurement principle, these superimposed fields constitute the field of the main conductor to be measured. The field generated by the primary sensor may then be monitored as a superposition by the secondary sensor. Thus, apart from a true signal plausibility check, the main-france detector generating the field can basically be monitored functionally.
The first magnetic field sensor may additionally have a measuring resistor, in particular a shunt resistor, with which the first signal can be converted into a first current, with the first current being proportional to the current flowing through the conductor. The voltage that drops across the measuring resistance of the first magnetic field sensor or of the brewster detector can thus be converted into a current that is proportional to the main conductor current to be measured, including the number of windings of the coil of the first magnetic field sensor. The measuring resistor is preferably a shunt resistor. The shunt resistance in the first magnetic field sensor cannot be confused with the principle of direct current measurement through the shunt resistance. The latter is in the milliohm range, whereas the shunt in the first magnetic field sensor may be e.g. 1 ohm, since the shunt only needs to handle significantly smaller currents.
The first magnetic field sensor may be configured to at least partially enclose the conductor. The second magnetic field sensor may be arranged on the analysis processing circuit board. Thus, a compact configuration of the sensor can be achieved. The two magnetic field sensors can be integrated in a common housing, for example, in a space-saving manner.
The analysis processing circuit may be configured to detect the first signal and the second signal in series and in parallel. Alternatively, the analysis processing circuit may be configured to intermittently and sequentially detect the first signal and the second signal. Thus, the sensor allows different modes of operation. In this way, the first and second magnetic field sensors can operate simultaneously and are continuously available without being synchronized with each other. This has the following advantages: there is no need to manage the sensor measurement intervals. Furthermore, the signals need not be stored for later use, but can be "cancelled" directly, e.g., by a differential arrangement. Alternatively, the first and second magnetic field sensors are activated or read sequentially. The alternating intervals are chosen such that an optimum value of measurement accuracy, sampling rate and interference sensitivity is achieved by the active coils of the first magnetic field sensor. This has the following advantages: the excitation field of the first magnetic field sensor does not interfere with the second magnetic field sensor.
The second magnetic field sensor may be planar. The second magnetic field sensor can therefore be arranged flat on the evaluation circuit board.
The second magnetic field sensor may be arranged perpendicular to the analytical processing circuit board. This allows for an additional orientation of the magnetic field for measuring the conductor.
The second magnetic field sensor may be a hall sensor or a magnetometer. Accordingly, the second magnetic field sensor may be a cost-effective sensor for indirectly measuring the current flowing through the conductor.
The first magnetic field sensor may be a Frst detector. Such a detector has the following advantages: the detector can detect the current flowing through the conductor contactlessly and indirectly. In addition, the detector is very sensitive over a wide measurement range.
The evaluation circuit may be configured to check the plausibility of the first signal by means of the second signal by detecting an absolute deviation or a relative deviation from each other. Thus, the functional capability of the first magnetic field sensor can be checked accurately. Thus, with consideration of the predefined tolerance limits, a faulty sensor signal can be determined, which is reported to the upper-level system via the communication interface of the sensor. Thus, existing errors can be noted at the system level and a secure state can be taken.
In addition, a motor vehicle or an electrical device is proposed. The motor vehicle or the electrical device has a battery and a sensor according to the invention according to the embodiments described above.
Within the scope of the present invention, a magnetic field sensor is generally understood to be a sensor for detecting a magnetic field. The magnetic field sensor can be configured in particular for measuring the magnetic flux density. The magnetic flux density is measured in tesla (T), and a common measurement range of magnetometers is about 10 -15 And a range of sizes from T to 10T.
In the context of the present invention, a plausibility check is understood as a method in which a value or a result is checked in general: whether the result is completely authentic, i.e., whether it is completely acceptable, reasonable, and understandable. Thus, minor deviations between the two measurements, e.g. <1%, can be tolerated.
Within the scope of the present invention,frst detector or Frst probe
-Sonde oder/>
Sonde) is also known as Fluxgate Magnetometer or saturated core Magnetometer, and is understood to be a Magnetometer for vectorially determining a magnetic field. The magnetometer is operated here by means of a toroidal core (Toroid), which is excited by means of an applied coil. The receiving coil surrounds the entire core, which is driven into saturation. In the absence of an external field, the induced voltage will result in a symmetrical current change process in the coil windings. In an alternative configuration, two soft magnetic coil cores are periodically driven into saturation. The core is wound with two opposing receive coils such that the induced voltages cancel each other in the absence of a field in both coils. The external magnetic field component acts on the fields of the two coils in parallel or antiparallel. Thus, when the external field is parallel to the field of a coil, the saturation state of the core is reached earlier in the coil in half-cycles. In the other coil, during the half period, the external field is antiparallel, so that the saturation of the core occurs later there. The asymmetry causes a resulting signal in the receive coil that is proportional to the applied field. The induced voltage has a double frequency of the exciter alternating voltage. By determining the phase and magnitude of the voltages induced in all four coils, the magnitude and direction of the horizontal component of the external field can be determined. Orthogonally arranged cores and measurement coils may also be used in order to determine the field vector in three-dimensional space. In order to improve the linearity and to increase the measuring range, a compensation coil located around the entire structure can be supplied with a regulated direct current, so that the voltage induced in the sensor coil becomes zero. The current is then proportional to the external field and counteracts the external field. The direct current is generated by means of negative feedback and is thus at the same time the output signal of the sensor. Constructed in this waySuch as a current sensor. If a fluxgate magnetometer with a compensation coil is constructed, this enables the fluxgate magnetometer to measure, for example, at higher frequencies up to the kHz range. However, this may be omitted for cost reasons within the scope of the present invention. Dc current measurement (positive and negative) is inherently particularly relevant, since the battery current should be measured here.
In the context of the present invention, a hall sensor is understood to be a sensor that uses the hall effect to measure a magnetic field. The hall sensor is composed of a crystalline doped semiconductor layer which is as thin as possible and which has four electrodes on the sides in most cases. The current is fed through two opposing electrodes, two electrodes orthogonal thereto being used to reduce the hall voltage. If a magnetic field extending perpendicular to the layer flows through such a hall sensor, the hall sensor provides an output voltage that is proportional to the magnitude (with a positive sign) of the vector product of magnetic flux density and current. The reason is the lorentz forces acting on the moving majority carriers in the layer. The vector product is proportional to the current, to the carrier mobility, and inversely proportional to the layer thickness (the thinner the layer, the greater the carrier velocity and the greater the lorentz force). The electric field that occurs between the measurement electrodes is in equilibrium with the hall voltage and prevents further carrier separation.
In addition, the hall voltage is also temperature dependent and may have an offset. Since the hall voltage is proportional to the carrier mobility and to the concentration of majority carriers, the hall effect is an introduced method for determining these characteristics in semiconductor technology. The hall sensor also provides a signal when the magnetic field in which the hall sensor is located is constant. This is advantageous compared to simple coils (e.g. induction coils, rogowski coils) as magnetic field sensors, which can only determine the derivative of the magnetic field with respect to time. Another important advantage of the hall sensor is that no ferromagnetic or ferrimagnetic material (e.g. nickel or iron) is required in order to realize the hall sensor. Thus, the magnetic field to be measured is not changed by bringing the sensor therein. Magnetoresistive sensors or fluxgate magnetometers do not have this characteristic.
In addition to this, there are further sensors for the magnetic flux density. The further sensor is not as sensitive and low noise as the sensors mentioned so far. Thus, in principle, the following sensor can be used as the second magnetic field sensor within the scope of the invention. Collectively referred to as xMR sensors; a thin layer sensor that directly changes its resistance under the influence of magnetic flux and is therefore referred to as "X-magnetoresistance". xMR stands for all sensors as follows: the sensor operates according to all known magnetoresistive methods, such as GMR sensors (giant, english: giant, german: "gewaltig, riesig", GMR effect), AMR sensors (anisotropic, english: anisotropic, german: "anisotrop", AMR effect) or CMR sensors (giant, english: colossal, german: "uberdimensional"), magnetoresistors, tunnel magneto-resistance (english: tunnel magnetoresistance, TMR). Although XMR and hall sensors are not as sensitive as the aforementioned sensors, they are used in a large scale in simpler tasks due to their simple construction (semiconductor technology) and the advantageous production associated therewith. This mainly includes a current sensor.
In summary, the sensor according to the invention provides a number of advantages. These advantages are set forth by way of example, but not by way of detail below.
The sensor according to the invention is based on a purely contactless measuring method, so that it can be realized already by means of a voltage separation from the high-voltage main conductor, due to principle decisions. Thus, no separate effort for high voltage isolation is required. Expensive precision resistors (shunts) are not required, and the power losses of these resistors, which may be tens of watts, are likewise omitted. The first and second magnetic field sensors can be completely encapsulated within the component, for example by means of injection molding. The measuring method can be integrated together on the circuit board.
If some applications do not require plausibility checking, this can be implemented as a fitting option, whereby a cost saving can be achieved with an increased number of pieces. The sensor allows for a cost-effective application of a sensor for obtaining a plausibility check signal with low costs, since only similar (non-identical) results need to be achieved. Drift of the sensors relative to each other can be identified. The individual sensors for plausibility checking can be dispensed with, and therefore, the usual individual sensors need not be connected to one another, system-side efforts can be dispensed with, since the sensors can be self-diagnosed, safety can be increased by a faster response time (short signal path/operating time), safety can be increased by subsystems or measurement principles that are compatible with one another on the factory side, since the compatibility of two independently used magnetic field sensors does not have to be ensured first of all with great effort. The main measuring principle is preferably a fluxgate magnetometer, which is distinguished by its high measuring accuracy. The fluxgate magnetometer is configured without a compensation coil, enabling a more cost-effective configuration. Since direct current measurement is mainly involved, the following limitations can be tolerated: the higher frequency portions (e.g., from 100 Hz) cannot be measured completely.
Drawings
Further optional details and features of the invention emerge from the following description of a preferred embodiment, which is illustrated schematically in the figures.
The drawings show:
FIG. 1 shows a perspective view of a sensor according to the present invention;
fig. 2 shows a front view of the sensor.
Detailed Description
Fig. 1 shows a perspective view of a sensor 10 according to the invention. The sensor 10 is configured to detect a current 14 flowing through the conductor 12. The conductor 12 is for example a copper cable or a conductor track for transmitting the current 14 to be measured. The sensor 10 has a first magnetic field sensor 16. The first magnetic field sensor 16 is configured to detect a magnetic field generated by the conductor 12. In addition, the first magnetic field sensor 16 is configured to output a first signal based on the detected magnetic field, the first signal indicative of the current 14 flowing through the conductor 12. First magnetic field sensor 16 havingThere is a magnetic core 18. The magnetic core 18 is made of, for example, a soft magnetic material. In addition, the first magnetic field sensor 16 has a coil 20. The coil 20 surrounds the core 18. For example, coil 20 is wound around core 18. The coil 20 is configured to generate a magnetic alternating field. The first signal is here a superposition of the induced voltage and the applied voltage. In addition, the first magnetic field sensor 16 has a measuring resistance, for example a shunt resistance, which is not shown in detail. The first signal can be converted into a first current by means of the measuring resistor. The first current is proportional to the current 14 flowing through the conductor 12, especially taking into account the number of windings of the coil 20. The first magnetic field sensor 16 is configured to at least partially surround the conductor 12. For example, the magnetic core 18 concentrically or coaxially surrounds the conductor 12. Thus, the core 18 is, for example, annular
And (5) constructing. Here, the magnetic core 18 does not contact the conductor 12. As can be seen from the above, the first magnetic field sensor 16 is in this exemplary embodiment embodied as a brewster detector.
Fig. 2 shows a front view of the sensor 10. As shown in fig. 2, the sensor 10 additionally has a second magnetic field sensor 22. The second magnetic field sensor 22 is configured to detect a magnetic field generated by the conductor 12. The second magnetic field sensor 22 is configured to output a second signal based on the detected magnetic field.
In addition, the sensor 10 has an analysis processing circuit 24. The analysis processing circuit 24 is arranged on an analysis processing circuit board 26. The analysis processing circuit 24 is, for example, an ASIC. The second magnetic field sensor 22 is constructed planar. The second magnetic field sensor 22 is arranged on an analysis processing circuit board 26. Alternatively, the second magnetic field sensor 22 may be arranged perpendicular to the analysis processing circuit board 26. The position of the second magnetic field sensor 22 can be selected such that it is as little influenced as possible by the coil 20 of the first magnetic field sensor 16. In particular, an optimum value between the distance from the conductor 12 and the distance from the coil 20 of the first magnetic field sensor 16 can be determined. The main measuring direction of the second magnetic field sensor 22 is selected such that it is tangential to the field lines surrounding the conductor 12 and thus the greatest sensitivity is achieved. The second magnetic field sensor 22 is a hall sensor. Alternatively, the second magnetic field sensor 22 may be a magnetometer or any magnetic field based sensor element. The first magnetic field sensor 16 and the second magnetic field sensor 22 are each connected to an analysis processing circuit 24. The first magnetic field sensor 16 may be present in a discrete configuration or may be present in a chip-integrated configuration with the evaluation circuit 24. In addition, the analytical processing circuit 24 is electrically contacted by means of an attachment circuit 28. The attachment line 28 is used for communication with, for example, a bus system and for energy supply. The first signal and the second signal can be detected by the analysis processing circuit 24. As will be explained in more detail below, the evaluation circuit 24 is designed to check the plausibility of the first signal by means of the second signal. The evaluation circuit is in particular designed to check the plausibility of the first signal by means of the second signal by detecting an absolute or relative deviation from one another. The analysis processing circuit 24 is configured to detect the first signal and the second signal in series and in parallel. Alternatively, the analysis processing circuit 24 is configured to intermittently and sequentially detect the first signal and the second signal.
The principle of operation of the sensor 10 is described in more detail below. If a current 14 flows through the conductor 12, a magnetic field is generated around the conductor 12. The first magnetic field sensor 16 is actuated such that the coil 20 generates a magnetic alternating field which is superimposed on the magnetic field to be measured of the conductor 12. By means of the non-linear magnetization course of the magnetic core 18 and the changing inductance in the saturation state, the magnetic field of the conductor 12 and thus the current 14 through the conductor 12 can be deduced by means of the superimposed alternating field. The voltage that drops across the measuring resistance of the first magnetic field sensor 16 can be converted as a first signal into a current that is proportional to the current 14 to be measured through the conductor 12, including the number of windings of the coil 20. The magnetic field generated by the current 14 to be measured can be simultaneously detected by the separate second magnetic field sensor 22 and can be output as a second signal. The second magnetic field sensor 22 may operate, for example, according to the hall principle or the xMR principle. For cost optimization purposes, lower accuracy or higher interference sensitivity can be tolerated. Thus, the magnetic field of the conductor 12, which is proportional to the current 14 to be measured, can be detected on two physically separate paths. The evaluation circuit 24 then performs a plausibility check on the two independently detected measured variables, i.e. the current intensity, by determining, for example, the absolute or relative deviation of the first signal and the second signal from one another. Taking into account the predefined tolerance limits, a faulty sensor signal can be determined, which is reported to the upper-level system via the communication interface of the sensor 10. Thus, existing errors can be noted at the system level and a secure state can be taken. In other words, the plausibility check is performed within the sensor 10. By comparing the absolute or relative deviation of the two signals within certain tolerance limits. Significant deviations, i.e. deviations above the threshold value, lead to detection of sensor errors and to output signals which lead to safe states in the upper systems, for example controllers.
The sensor 10 can be used in particular in the motor vehicle technical field. However, sensor 10 is not intended to be limited to a battery current sensor that monitors, among other things, the State of Charge (State of Charge) of a traction battery in an electrified vehicle. It is explicitly emphasized that the sensor 10 can also be used outside of electrified drive trains, for example in industrial sensors, aerospace or medical technology. The invention can be demonstrated in that the use of the second magnetic field sensor can be demonstrated by evaluating the printed circuit board or printed circuit board and the structural elements mounted therein.
Claims (10)
1. A sensor (10) for detecting a current (14) flowing through a conductor (12), the sensor comprising:
a first magnetic field sensor (16) configured to detect a magnetic field generated by the conductor (12), wherein the first magnetic field sensor (16) is configured to output a first signal based on the detected magnetic field, the first signal being indicative of a current flowing through the conductor (12),
a second magnetic field sensor (22) configured to detect a magnetic field generated by the conductor (12), wherein the second magnetic field sensor (22) is configured to output a second signal based on the detected magnetic field,
an evaluation circuit (24) on an evaluation circuit board (26), wherein the first magnetic field sensor (16) and the second magnetic field sensor (22) are connected to the evaluation circuit (24), wherein the first signal and the second signal can be detected by the evaluation circuit (24), wherein the evaluation circuit (24) is configured to evaluate the first signal for plausibility using the second signal.
2. The sensor (10) according to the preceding claim, wherein the first magnetic field sensor (16) has a magnetic core (18) and a coil (20) surrounding the magnetic core (18), wherein the coil (20) is configured for generating a magnetic alternating field, wherein the first signal is a superposition of an induced voltage and an applied voltage.
3. The sensor (10) according to any one of the preceding claims, wherein the first magnetic field sensor (16) additionally has a measuring resistance, in particular a shunt resistance, wherein the first signal can be converted into a first current by means of the measuring resistance, wherein the first current is proportional to the current flowing through the conductor (12).
4. The sensor (10) of any one of the preceding claims, wherein the first magnetic field sensor (16) is configured to at least partially enclose the conductor (12), wherein the second magnetic field sensor (22) is arranged on the analysis processing circuit board (26).
5. The sensor (10) of any one of the preceding claims, wherein the analysis processing circuit (24) is configured to detect the first signal and the second signal continuously and in parallel, or wherein the analysis processing circuit (24) is configured to detect the first signal and the second signal intermittently and sequentially.
6. The sensor (10) of any one of the preceding claims, wherein the second magnetic field sensor (22) is configured planar.
7. The sensor (10) of any of the preceding claims, wherein the second magnetic field sensor (22) is arranged perpendicular to the analysis processing circuit board (26).
8. The sensor (10) of any of the above claims, wherein the second magnetic field sensor (22) is a hall sensor or an xMR magnetometer.
9. The sensor (10) of any of the above claims, wherein the first magnetic field sensor (16) is a france detector.
10. The sensor (10) according to any one of the preceding claims, wherein the analysis processing circuit (24) is configured for plausibility checking the first signal by means of the second signal by detecting an absolute deviation or a relative deviation from each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020208804.7 | 2020-07-15 | ||
| DE102020208804.7A DE102020208804A1 (en) | 2020-07-15 | 2020-07-15 | Sensor for detecting an electric current flowing through a conductor |
| PCT/EP2021/067949 WO2022012930A1 (en) | 2020-07-15 | 2021-06-30 | Sensor for detecting an electric current flowing through a conductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116235059A true CN116235059A (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180061280.5A Pending CN116235059A (en) | 2020-07-15 | 2021-06-30 | Sensor for detecting current flowing through conductor |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4182706A1 (en) |
| CN (1) | CN116235059A (en) |
| DE (1) | DE102020208804A1 (en) |
| WO (1) | WO2022012930A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022210607A1 (en) * | 2022-10-07 | 2024-04-18 | Robert Bosch Gesellschaft mit beschränkter Haftung | Sensor for detecting an electric current flowing through a conductor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2511714A3 (en) * | 2011-04-15 | 2015-05-27 | Magna E-Car Systems GmbH & Co OG | Sensor component, sensor control and current measurement circuit |
| DE102011088893A1 (en) | 2011-12-16 | 2013-06-20 | Robert Bosch Gmbh | Current measuring circuit, battery and motor vehicle |
| US9291648B2 (en) * | 2013-08-07 | 2016-03-22 | Texas Instruments Incorporated | Hybrid closed-loop/open-loop magnetic current sensor |
| DE102014219238A1 (en) * | 2014-09-24 | 2016-03-24 | Continental Automotive Gmbh | Overcurrent detection in the current sensor with Hall sensor |
-
2020
- 2020-07-15 DE DE102020208804.7A patent/DE102020208804A1/en active Pending
-
2021
- 2021-06-30 CN CN202180061280.5A patent/CN116235059A/en active Pending
- 2021-06-30 WO PCT/EP2021/067949 patent/WO2022012930A1/en unknown
- 2021-06-30 EP EP21743066.9A patent/EP4182706A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022012930A1 (en) | 2022-01-20 |
| EP4182706A1 (en) | 2023-05-24 |
| DE102020208804A1 (en) | 2022-01-20 |
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