Degaussing device and degaussing method of Hall current sensor, and control device

Abstract

The embodiment of the invention provides a degaussing device and degaussing method for a Hall current sensor, and the degaussing device comprises a reference sensor and a signal processing unit. When a magnetic field signal corresponding to a primary side current flowing through a primary side current row and collected by a reference sensor is zero and a Hall chip detects that the magnetic flux of a magnetic core piece is non-zero, the signal processing unit sends the magnetic field signal to the primary side current row, and the magnetic field signal corresponds to the primary side current flowing through the primary side current row. And generating a degaussing signal of which the amplitude is decreased progressively and the directions are alternated positively and negatively, and applying the degaussing signal to the primary side current bar, so that the hysteresis magnetic field of the magnetic core piece is gradually reduced to zero to realize degaussing. Compared with demagnetization related technologies adopting heating demagnetization or applying a reverse magnetic field and the like, the demagnetization device has the advantages of simple structure, convenience in operation, good demagnetization effect and the like.

Description

Technical Field

[0001] The present disclosure relates to the technical field of current sensors, and in particular to a demagnetization device and a demagnetization method for a Hall current sensor, and a control device. Background Art

[0002] Current sensors are used in various industries such as batteries, converters, chargers, renewable energy, industry, and motor vehicles. At present, the current sensors used to detect current mainly include shunts, current transformers, Hall current sensors, magnetoresistance, and fluxgate technology current sensors.

[0003] Among them, the Hall current sensor based on the Hall effect has been widely used because of its non-contact measurement and good reliability and low power consumption. According to the structure and flux measurement method, the Hall current sensor can be divided into open-loop and closed-loop types. Taking the open-loop Hall current sensor as an example, a magnetic core is installed in the installation space of its mounting shell. The magnetic core has an open air gap formed between the two ends of the magnetic core. The magnetic core is installed in the shell, and the Hall chip is plugged into the open air gap through the shell.

[0004] In the open-loop Hall current sensor as mentioned above, relatively weak magnetization will remain in the magnetic core. Due to the residual magnetization remaining in the magnetic core, residual magnetic flux will be generated from the magnetic core even in a zero magnetic field. The Hall chip will produce hysteresis error due to detecting the residual magnetic flux, affecting the accuracy of current detection. Therefore, how to obtain the hysteresis characteristics of the Hall current sensor is of great significance to the research and production process of the Hall current sensor. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the related technologies, the purpose of the present disclosure is to provide a demagnetization device, a demagnetization method and a control device for a current sensor, which can better study the hysteresis characteristics of the Hall current sensor and is also conducive to the improvement of the production process of the Hall current sensor.

[0006] In a first aspect, the present disclosure provides a demagnetization device for a Hall current sensor, the Hall current sensor comprising a mounting shell, a magnetic core, a primary current row, and a Hall chip, the demagnetization device comprising:

[0007] a reference sensor, associated with the primary current train, for collecting a magnetic field signal corresponding to a primary current flowing through the primary current train; and

[0008] A signal processing unit is connected to the Hall chip, the reference sensor, and the primary current train, and is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions when the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core member detected by the Hall chip is non-zero when the primary current train is in a power-off state, and apply the demagnetization signal to the primary current train to complete the demagnetization of the magnetic core member; the demagnetization signal gradually decays from a set value to zero within a preset demagnetization time, wherein the signal amplitude in a later cycle of the demagnetization signal is smaller than the signal amplitude in a previous cycle.

[0009] In some examples of the first aspect, the reference sensor is a fluxgate sensor, which is mounted on the primary current bus.

[0010] In certain examples of the first aspect, the signal processing unit includes: a control device connected to the Hall chip and the reference sensor; a signal generator controlled by the control device and used to generate a demagnetization signal; a signal amplifier connected to the signal generator and the primary current train, used to amplify the demagnetization signal generated by the signal generator and apply the amplified demagnetization signal to the primary current train.

[0011] In some examples of the first aspect, the demagnetization signal is a demagnetization voltage signal, and the demagnetization voltage signal is implemented as a sine wave signal, or a square wave signal, or a trapezoidal wave signal, or a triangle wave signal.

[0012] A second aspect of the present disclosure provides a demagnetization method for a Hall current sensor, which is applied to the demagnetization device for the Hall current sensor as described above. The demagnetization method for the Hall current sensor comprises the following steps:

[0013] Using the Hall chip to detect the magnetic flux of the magnetic core and using the reference sensor to collect the magnetic field signal corresponding to the primary current flowing through the primary current row; and

[0014] When the primary current train is in a power-off state, when the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core member detected by the Hall chip is non-zero, the signal processing unit is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and the demagnetization signal is applied to the primary current train to complete the demagnetization of the magnetic core member; the demagnetization signal gradually decays from a set value to zero within a preset demagnetization time, wherein the signal amplitude in a later cycle of the demagnetization signal is smaller than the signal amplitude in a previous cycle.

[0015] In certain examples of the second aspect, the signal processing unit is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and the demagnetization signal is applied to the primary current train, including the following steps: generating a demagnetization signal with decreasing amplitude and alternating positive and negative directions; amplifying the demagnetization signal and applying the amplified demagnetization signal to the primary current train.

[0016] In certain examples of the second aspect, the demagnetization method also includes the following steps: after demagnetization is completed within a predetermined demagnetization time, determining whether the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and whether the magnetic flux of the magnetic core detected by the Hall chip is zero; if it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is zero, it indicates that the demagnetization is successful; if it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero, it indicates that the demagnetization has failed.

[0017] In some examples of the second aspect, the demagnetization method further includes the following step: if the demagnetization is not completed within a predetermined demagnetization time, it indicates that the demagnetization has failed.

[0018] In some examples of the second aspect, the demagnetization method further includes the following steps: when demagnetization fails, adjusting the demagnetization signal using the signal processing unit; adjusting the demagnetization signal includes at least one of adjusting the amplitude of the demagnetization signal and adjusting the demagnetization time.

[0019] In some examples of the second aspect, the demagnetization signal is a demagnetization voltage signal, and the demagnetization voltage signal is implemented as a sine wave signal, or a square wave signal, or a trapezoidal wave signal, or a triangle wave signal.

[0020] A third aspect of the present disclosure provides a control device, comprising:

[0021] processor;

[0022] A memory storing a degaussing program;

[0023] Wherein, when the demagnetization program is executed by the processor, the demagnetization method of the Hall current sensor as described above is executed.

[0024] As described above, the demagnetization device and demagnetization method of the Hall current sensor provided in the embodiments of the present disclosure, the demagnetization device includes: a reference sensor and a signal processing unit, the signal processing unit generates a demagnetization signal with decreasing amplitude and alternating positive and negative directions when the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core piece detected by the Hall chip is non-zero when the primary current row is in a power-off state, and the demagnetization signal is applied to the primary current row, so that the hysteresis magnetic field of the magnetic core piece gradually decreases until it is zero to achieve demagnetization. Compared with the related demagnetization technologies such as heating demagnetization or applying a reverse magnetic field, it has the advantages of simple structure, convenient operation, good demagnetization effect, etc., and can study the hysteresis characteristics of the Hall current sensor, which is beneficial to the research of the Hall current sensor and the improvement of its production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a schematic diagram of the structure of a Hall sensor in one embodiment of the present disclosure.

[0026] Figure 2 Display as Figure 1 Schematic diagram of the structure of the installation shell.

[0027] Figure 3 Display as Figure 1 Schematic diagram of the structure of the magnetic core component.

[0028] Figure 4 It is a schematic diagram of the structure of the Hall sensor in another embodiment of the present disclosure.

[0029] Figure 5 It is a schematic structural diagram of a magnetic core member in another embodiment.

[0030] Figure 6 Display as Figure 1 Three-dimensional structural diagram of the magnetic core component.

[0031] Figure 7 It is a schematic diagram showing the structure of a demagnetization device of a Hall sensor disclosed in one embodiment.

[0032] Figure 8 It is a schematic structural diagram of a demagnetization device of a Hall sensor disclosed in another embodiment.

[0033] Fig. 9 A signal diagram showing a demagnetization signal applied to a primary current train in one embodiment is shown.

[0034] Fig.10 and Fig.11 A signal diagram showing a demagnetization signal applied to a primary current bus in other embodiments.

[0035] Fig.12 FIG. 1 is a flow chart of a demagnetization method for a Hall sensor disclosed in one embodiment.

[0036] Fig.13 It is a detailed schematic diagram of the demagnetization method of the Hall sensor disclosed in one embodiment.

[0037] Fig.14 Shown is a schematic diagram of the structure of the control device of the present disclosure in one embodiment. DETAILED DESCRIPTION

[0038] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed in the present disclosure. The present disclosure can also be implemented or applied to circuits through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application circuits without departing from the spirit of the present disclosure. It should be noted that the embodiments and features in the embodiments in the present disclosure can be combined with each other without conflict.

[0039] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0040] In the representations of the present disclosure, the reference terms "one embodiment", "certain embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and features of different embodiments or examples, unless they are mutually contradictory.

[0041] In addition, the terms "first" and "second" are only suitable for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, the meaning of "a group" is two or more, unless otherwise clearly and specifically defined.

[0042] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0043] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0044] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, circuits, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, circuits, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0045] The technical terms used herein are only applicable to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0046] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0047] In traditional Hall current sensors, even when the power is off, magnetic domain magnetization will remain in the magnetic core, generating residual magnetic flux. The Hall chip will generate hysteresis error due to detecting the residual magnetic flux, affecting the accuracy of current detection.

[0048] In view of this, a demagnetization device and a demagnetization method for a Hall current sensor are provided in an embodiment of the present disclosure to solve the problems in the related art.

[0049] The Hall current sensor in the disclosed embodiment can be applied to various industries such as batteries, converters, chargers, renewable energy, industry, and motor vehicles. Taking battery management as an example, the Hall current sensor can detect battery current abnormalities in a timely manner, such as excessive current, thereby triggering corresponding protection measures, such as disconnecting the battery charging and discharging circuit to ensure that the battery is in a safe operating state. By monitoring the current in the battery pack in real time, the Hall current sensor can provide accurate data support for the energy management system. In addition, based on the output of the Hall current sensor, the battery charging and discharging strategy can be optimized, thereby improving the energy utilization efficiency of the entire system.

[0050] See also Figures 1 to 3 ,in, Figure 1 It is a schematic diagram showing the structure of a Hall sensor in one embodiment. Figure 2 Display as Figure 1 The structural diagram of the installation shell is shown in Figure 2. Figure 3 Display as Figure 1 Schematic diagram of the structure of the magnetic core component.

[0051] Combination Figures 1 to 3 The Hall sensor includes: a mounting shell 11, a magnetic core 13, a primary current row 15, and a Hall chip 17.

[0052] The installation shell 11 is a shell structure made of insulating material and has an installation space 101 . The size of the installation space 101 is adapted to the magnetic core 13 .

[0053] The magnetic core member 13 is installed in the installation space 111 of the installation case 11 .

[0054] In the embodiments disclosed in the present application, the Hall sensor may be an open-loop Hall sensor.

[0055] As shown in the figure, the magnetic core 13 has a plug-in channel 131, and the mounting shell 11 is provided with a notch 133 corresponding to the plug-in channel 131. The cross-sectional size of the plug-in channel 131 is adapted to the primary current bus 15, and the primary current bus 15 penetrates the mounting shell 11 in a manner of being plugged into the plug-in channel 131, and the mounting shell 11 is provided with a through opening 115 for the primary current bus 15 to penetrate.

[0056] The cross-sectional shape of the plug-in channel in the magnetic core 13 is consistent with that of the primary current row 15. Figure 1 In the embodiment shown, the primary current row 15 is configured to be rectangular, and the cross section of the insertion channel 131 of the magnetic core 13 is rectangular. However, this is not limited to this, see Figure 4 For example, the primary current row 15' is configured to be cylindrical, the cross section of the plug-in channel of the magnetic core 13' is circular, and the installation space of the installation shell 11' is circular to match the magnetic core 13'.

[0057] The primary current bar 15 is a metal conductor for conducting the primary current. For example, the primary current bar 15 may be a copper bar, and two opposite ends of the copper bar may be connected to the wiring terminals respectively. During the test, one end may be connected to the positive electrode, and the other end may be connected to the negative electrode.

[0058] The magnetic core 13 also has a notch 133, which is located at the side of the magnetic core 13 and extends toward the insertion channel 131 to communicate with the insertion channel 131. An installation groove 113 is formed in the installation shell 11 at a position corresponding to the notch 133 of the magnetic core 13, that is, the installation shell 11 is partially recessed in the notch 133 of the magnetic core 13 to form the installation groove 113 in the notch 133.

[0059] In such Figure 3 In the embodiment shown, the magnetic core member is configured as a magnetic core (in the following Figure 3 In the description, the magnetic core is marked as 13), the magnetic core 13 forms a plug-in channel 131 in the form of two opposite ends, and a gap 133 is formed between the two opposite ends of the magnetic core. However, this is not limited to this, please refer to Figure 5 Exemplarily, the magnetic core piece is configured as two magnetic cores, which can be referred to as a first magnetic core 132 and a second magnetic core 134. The first magnetic core 132 includes a first end 132a and a second end 132b, and the second magnetic core 134 includes a first end 134a and a second end 134b. The first magnetic core 132 and the second magnetic core 134 are in the form of a first end 132a of the first magnetic core 132 and a first end 134a of the second magnetic core 134 abutting against each other and the second end 132b of the first magnetic core 132 and the second end 134b of the second magnetic core 134 being spaced apart and opposite to each other to form an insertion channel 131, and a notch 133 is formed between the second end 132b of the first magnetic core 132 and the second end 134b of the second magnetic core 134.

[0060] Still Figure 3 Taking the magnetic core member 13 in the example, in some optional embodiments, as Figure 6As shown, the magnetic core member 13 may include a plurality of magnetic core pieces 130, each of which forms a plug-in interface 1310, and the size of the plug-in interface 1310 is adapted to the primary current row 15. The plurality of magnetic core pieces 130 are stacked in a form corresponding to the plug-in interface 1310 to form the magnetic core member 13, and the plug-in interfaces 1310 of the plurality of magnetic core pieces 130 are connected to form a plug-in channel 131 with a certain length. The magnetic core member 13 formed by stacking the plurality of magnetic core pieces 130 is installed in the installation space 111 of the installation shell 11, and the primary current row 15 penetrates the installation shell in a manner of simultaneously plugging the plug-in channels 131 of the magnetic core member 13 formed by stacking the plurality of magnetic core pieces 130.

[0061] The Hall chip 17 is installed in the mounting groove 113. The Hall chip 17 may include a chip body and a plurality of pins, the plurality of pins extending from the chip body, the chip body of the Hall chip 17 is plugged into the mounting groove 113 of the mounting shell 11 and the plurality of pins of the Hall chip 17 can extend, so that the Hall chip 17 is insulated and separated from the primary current row 15 and the magnetic core member 13 by the mounting shell 11.

[0062] In this way, when measuring the current of the primary current row 15, the non-insulated design between the magnetic core piece 13 and the primary current row 15 allows the magnetic core piece 13 to be designed to be smaller and the overall structure to be compact compared to the related art, effectively reducing the overall size of the Hall current sensor component. It can be understood by those skilled in the art that for the same magnitude of the current to be measured, the smaller the size of the magnetic core piece 13 in the direction in which the notch 133 extends toward the plug-in channel 131, the greater the corresponding induced magnetic induction intensity, and the higher the measurement accuracy of the Hall current sensor. In this regard, the non-insulated design between the magnetic core piece 13 and the primary current row 15 allows the magnetic core piece 13 to be designed to be smaller and the measurement accuracy to be higher.

[0063] Generally, for a Hall current sensor, when powered on, the primary current I p The current flowing through the primary current row 15 generates a magnetic field, which is accumulated by the magnetic core 13. The magnetic flux of the magnetic core 13 is detected by the Hall chip 17 located at the air gap of the magnetic core 13, and the primary current I flowing through the primary current row 15 is obtained by detecting the magnetic flux of the Hall chip. p When the power is off, the primary current I flowing through the primary current row 15 p is zero, the magnetic field in the magnetic core 13 is zero, the magnetic flux of the magnetic core 13 detected by the Hall chip 17 is zero, and the detection current is zero. However, in actual application, when the power is off, the primary current I flowing through the primary current row 15 pThe magnetic core 13 is zero, but there is weak residual magnetization in the magnetic core 13 and residual magnetic flux (also called hysteresis), and the Hall chip 17 can still detect the residual magnetic flux in the magnetic core 13 and obtain the corresponding detection current, which affects the accuracy of current detection. Therefore, it is necessary to demagnetize the magnetic core 13 with hysteresis.

[0064] See also Figure 7 , which is a schematic diagram of the structure of a demagnetization device for a Hall current sensor disclosed in one embodiment.

[0065] like Figure 7 As shown, the demagnetization device of the Hall current sensor disclosed in the present invention includes a reference sensor 21 and a signal processing unit 23 .

[0066] As mentioned above, the Hall chip 17 can determine the magnetic field signal of the magnetic core 13 by detecting the magnetic flux of the magnetic core 13 .

[0067] In some embodiments, if the magnetic flux detected by the Hall chip 17 is zero, the magnetic field signal of the magnetic core 13 can be determined to be zero; if the magnetic flux detected by the Hall chip is non-zero, the magnetic field signal of the magnetic core 13 can be determined to be non-zero.

[0068] The reference sensor 21 is associated with the primary current bank 15 and is used to collect a magnetic field signal corresponding to the primary current flowing through the primary current bank 15 .

[0069] In some embodiments, the reference sensor 21 is a fluxgate sensor, which is mounted on the primary current row. Compared with the magnetic core 13, the fluxgate sensor has the advantages of high sensitivity, high measurement accuracy, and no hysteresis. The fluxgate sensor can accurately reflect the magnetic field signal of the primary current row 15, that is, if the primary current I p is zero, then the corresponding magnetic field signal collected by the fluxgate sensor is zero.

[0070] The signal processing unit 23 is connected to the Hall chip 17 , the reference sensor 21 , and the primary current bus 15 .

[0071] In some embodiments, the signal processing unit 23 may be connected to the Hall chip 17 and the reference sensor 21 via a CAN bus, a USB data line, or the like.

[0072] The signal processing unit 23 can receive the magnetic flux of the magnetic core 13 detected by the Hall chip 17 and the magnetic field signal corresponding to the primary current flowing through the primary current row 15 collected by the reference sensor 21. Based on the comparison between the magnetic flux of the magnetic core 13 detected by the Hall chip 17 and the magnetic field signal corresponding to the primary current flowing through the primary current row 15, it can be determined whether the magnetic core 13 has a hysteresis phenomenon. For example, when the primary current row 15 is in a power-off state and no current flows, the magnetic field signal corresponding to the primary current flowing through the primary current row 15 collected by the reference sensor 21 is zero. If the magnetic flux of the magnetic core 13 detected by the Hall chip 17 is zero, it indicates that the magnetic core 13 has no hysteresis phenomenon. If the magnetic flux of the magnetic core 13 detected by the Hall chip 17 is non-zero, it indicates that the magnetic core 13 has a hysteresis phenomenon.

[0073] In the embodiment of the present disclosure, if the magnetic field signal corresponding to the primary current flowing through the primary current train 15 collected by the reference sensor 21 is zero and the magnetic flux of the magnetic core 13 detected by the Hall chip 17 is non-zero when the primary current train 15 is in a power-off state, the signal processing unit 23 generates a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and applies the demagnetization signal to the primary current train 15, so that the magnetic core 13 eliminates the magnetic field under the action of the demagnetization signal flowing through the primary current train 15.

[0074] In practical applications, the demagnetization signal gradually decays from a set value to zero within a preset demagnetization time, wherein the signal amplitude in the latter cycle is smaller than the signal amplitude in the previous cycle, that is, the signal amplitude of the demagnetization signal gradually decays to zero within the cycle.

[0075] See also Figure 8 , which is a schematic structural diagram of a demagnetization device for a Hall current sensor disclosed in another embodiment.

[0076] like Figure 8 As shown, the Hall current sensor disclosed in the present invention includes a reference sensor 21 and a signal processing unit. The signal processing unit may further include: a control device 231 , a signal generator 233 , and a signal amplifier 235 .

[0077] As mentioned above, the Hall chip 17 can determine the magnetic field signal of the magnetic core 13 by detecting the magnetic flux of the magnetic core 13 .

[0078] In some embodiments, if the magnetic flux detected by the Hall chip 17 is zero, the magnetic field signal of the magnetic core 13 can be determined to be zero; if the magnetic flux detected by the Hall chip is non-zero, the magnetic field signal of the magnetic core 13 can be determined to be non-zero.

[0079] The reference sensor 21 is associated with the primary current bank 15 and is used to collect a magnetic field signal corresponding to the primary current flowing through the primary current bank 15 .

[0080] In some embodiments, the reference sensor 21 is a fluxgate sensor, which is mounted on the primary current row. Compared with the magnetic core 13, the fluxgate sensor has the advantages of high sensitivity, high measurement accuracy, and no hysteresis. The fluxgate sensor can accurately reflect the magnetic field signal of the primary current row 15, that is, if the primary current I p is zero, then the corresponding magnetic field signal collected by the fluxgate sensor is zero.

[0081] The control device 231 is connected to the Hall chip 17 and the reference sensor 21, and can receive the magnetic flux detected by the Hall chip 17 and the magnetic field signal corresponding to the primary current flowing through the primary current row 15 collected by the reference sensor 21. Based on the comparison of the detected magnetic flux and the magnetic field signal corresponding to the primary current flowing through the primary current row 15, it can be determined whether the magnetic core 13 has a hysteresis phenomenon. For example, when the primary current row is in a power-off state and no current flows, the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor 21 is zero. If the magnetic flux detected by the Hall chip 17 of the magnetic core 13 is zero, it indicates that the magnetic core 13 has no hysteresis phenomenon. If the magnetic flux detected by the Hall chip 17 of the magnetic core 13 is non-zero, it indicates that the magnetic core 13 has a hysteresis phenomenon.

[0082] In the embodiment of the present disclosure, if the magnetic field signal corresponding to the primary current flowing through the primary current bus 15 collected by the reference sensor 21 is zero when the primary current bus 15 is in a power-off state and the Hall chip 17 detects that the magnetic flux of the magnetic core 13 is non-zero, the control device 231 generates a demagnetization command to the signal generator.

[0083] In some optional embodiments, the control device 231 may be implemented as an industrial computer. In some embodiments, the control device 231 may be connected to the Hall chip 17 and the reference sensor 21 via a CAN bus, a USB data line, or the like.

[0084] The signal generator 233 is controlled by the control device 231 and is used to generate a demagnetization signal. The demagnetization signal is a weak signal, which gradually decays from a set value to zero within a preset demagnetization time, wherein the amplitude of the excitation voltage in the latter cycle is smaller than the amplitude of the excitation voltage in the previous cycle. Exemplarily, the demagnetization signal may be, for example, a demagnetization voltage signal.

[0085] The signal amplifier 235 is connected to the signal generator 233 and the primary current train 15 , and is used to amplify the demagnetization signal generated by the signal generator 233 and apply the amplified demagnetization signal to the primary current train 15 .

[0086] See also Fig. 9, which is a schematic diagram of a demagnetization signal applied to the primary current row in one embodiment. Fig. 9 As shown, the applied demagnetization signal may be, for example, a demagnetization voltage signal, which is implemented as a positive and negative alternating sinusoidal wave signal, and the sinusoidal wave signal gradually decays periodically. Exemplarily, the demagnetization voltage signal is positive and has an amplitude of I1 in the first half of the first cycle, the demagnetization voltage signal is negative and has an amplitude of I2 (I2 < I1) in the second half of the first cycle, the demagnetization voltage signal is positive and has an amplitude of I3 (I3 < I2) in the first half of the second cycle, the demagnetization voltage signal is negative and has an amplitude of I4 (I4 < I3) in the second half of the second cycle, ..., until it decays to zero. In this process, the magnetic field accumulated by the magnetic core will gradually decay to zero following the change of the demagnetization current signal flowing through the primary current row, thereby completing the demagnetization.

[0087] Of course, the applied demagnetization voltage signal may also adopt other waveforms. For example, the applied excitation voltage may also be a square wave signal or a trapezoidal wave signal (such as Fig.10 as shown), or a triangular wave signal (as Fig.11 shown) etc.

[0088] In applications such as Figure 8 In the demagnetization device of the Hall current sensor shown, first, when the Hall current sensor is powered off, the control device 231 receives the magnetic flux of the magnetic core 13 detected by the Hall chip 17 and enables the reference sensor 21 to collect the magnetic field signal corresponding to the primary current flowing through the primary current array 15; if the magnetic field signal corresponding to the primary current flowing through the primary current array 15 collected by the reference sensor 21 is zero and the magnetic flux of the magnetic core 13 detected by the Hall chip 17 is non-zero, the control device 231 sends a demagnetization instruction to the signal generator 233 to enable the signal generator 233 to generate a gradually decaying demagnetization signal according to the demagnetization instruction, and the demagnetization signal is amplified by the signal amplifier 235 and then applied to the primary current array 15, so that a gradually decaying demagnetization current is generated flowing through the primary current array 15, so that the magnetic field of the magnetic core 13 gradually decays until it decays to zero, thereby completing the demagnetization.

[0089] The amplitude and demagnetization time of the demagnetization signal can be set according to the product specifications and demagnetization requirements of the Hall current sensor used. For example, the amplitude and demagnetization time of the demagnetization signal are increased according to the product specifications and demagnetization requirements of the Hall current sensor. In addition, if the magnetic core is not demagnetized to a zero magnetic field within the preset demagnetization time, the signal processing unit or the control device in the signal processing unit can apply a gradually decaying demagnetization signal to the primary current row again to continue demagnetizing the magnetic core.

[0090] The demagnetization device of the Hall current sensor provided in the embodiment of the present disclosure includes: a reference sensor and a signal processing unit. When the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero, the signal processing unit generates a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and applies the demagnetization signal to the primary current row, so that the hysteresis magnetic field of the magnetic core gradually decreases until it is zero to achieve demagnetization. Compared with the related demagnetization technologies such as heating demagnetization or applying a reverse magnetic field, it has the advantages of simple structure, convenient operation, good demagnetization effect, etc., and can study the hysteresis characteristics of the Hall current sensor, which is beneficial to the research of the Hall current sensor and the improvement of its production process.

[0091] The present disclosure further provides a demagnetization method for a Hall current sensor.

[0092] See also Fig.12 , which is a schematic flow chart of a demagnetization method for a Hall sensor disclosed in one embodiment.

[0093] The demagnetization method of the Hall sensor is applied to a demagnetization device of a Hall current sensor, and the demagnetization device includes a reference sensor and a signal processing unit.

[0094] like Fig.12 As shown, the demagnetization method of the Hall sensor includes the following steps:

[0095] Step S301 : Using a Hall chip to detect the magnetic flux of the magnetic core and using a reference sensor to collect a magnetic field signal corresponding to the primary current flowing through the primary current train.

[0096] In some embodiments, if the magnetic flux of the magnetic core is detected to be zero, the magnetic field signal of the magnetic core is determined to be zero; if the magnetic flux of the magnetic core is detected to be non-zero, the magnetic field signal of the magnetic core is determined to be non-zero.

[0097] In some embodiments, if the primary current I p is zero, then the corresponding magnetic field signal collected by the reference sensor is zero.

[0098] Step S303, when the primary current bus is in a power-off state, determine whether the demagnetization condition is met?

[0099] In step S303, the signal processing unit receives the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor and the magnetic flux of the magnetic core detected by the Hall chip, and determines whether the demagnetization condition is met. The demagnetization condition includes: the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero.

[0100] If the demagnetization condition is not met, the process returns to step S301; if the demagnetization condition is met, the process proceeds to step S305.

[0101] Step S305 , using a signal processing unit to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and applying the demagnetization signal to the primary current row to complete the demagnetization of the magnetic core.

[0102] Through the above steps, the magnetic core piece can be demagnetized.

[0103] The demagnetization method of the Hall current sensor provided in the embodiment of the present disclosure, when the Hall current sensor is powered off, when the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero, a gradually decaying demagnetization signal is applied to the primary current row to demagnetize the magnetic core. Compared with the demagnetization related technologies such as heating demagnetization or applying reverse magnetic field, it has the advantages of simple structure, convenient operation, good demagnetization effect, etc.

[0104] See also Fig.13 , which is a schematic flow chart of the demagnetization method of the Hall sensor disclosed in another embodiment.

[0105] The demagnetization method of the Hall sensor is applied to a demagnetization device of a Hall current sensor. The demagnetization device includes a reference sensor and a signal processing unit. The signal processing unit includes a controller, a signal generator, and a signal amplifier.

[0106] like Fig.13 As shown, the demagnetization method of the Hall sensor includes the following steps:

[0107] Step S401 : Using a Hall chip to detect the magnetic flux of the magnetic core and using a reference sensor to collect a magnetic field signal corresponding to the primary current flowing through the primary current train.

[0108] In some embodiments, if the magnetic flux of the magnetic core is detected to be zero, the magnetic field signal of the magnetic core is determined to be zero; if the magnetic flux of the magnetic core is detected to be non-zero, the magnetic field signal of the magnetic core is determined to be non-zero.

[0109] In some embodiments, if the primary current I pis zero, then the corresponding magnetic field signal collected by the reference sensor is zero.

[0110] Step S403, when the primary current bus is in a power-off state, determine whether the demagnetization condition is met?

[0111] In step S403, the signal processing unit receives the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor and the magnetic flux of the magnetic core detected by the Hall chip, and determines whether the demagnetization condition is met. The demagnetization condition includes: the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero.

[0112] If the demagnetization condition is not met, the process returns to step S401; if the demagnetization condition is met, the process proceeds to step S405.

[0113] Step S405: using the control device to send a demagnetization instruction to the signal generator.

[0114] Step S407, using a signal generator to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions according to the received demagnetization instruction.

[0115] In some optional embodiments, the demagnetization signal is a demagnetization voltage signal, and the demagnetization voltage signal is implemented as a sine wave signal, or a square wave signal, or a trapezoidal wave signal, or a triangle wave signal.

[0116] Step S409: amplify the demagnetization signal using a signal amplifier and apply the amplified demagnetization signal to the primary current train.

[0117] Step S411, determining whether the demagnetization is completed within the predetermined demagnetization time.

[0118] If the demagnetization is completed within the predetermined demagnetization time, the process proceeds to step S413; if the demagnetization is not completed within the predetermined demagnetization time, it indicates that the demagnetization has failed due to a demagnetization timeout, and the process proceeds to step S415.

[0119] Step S413, determine whether the demagnetization is successful?

[0120] In step S413, the control device receives the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor and the magnetic flux of the magnetic core detected by the Hall chip, and judges whether the demagnetization is successful based on the magnetic field signal. The judgment basis of the success of the demagnetization specifically includes: the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is zero.

[0121] If it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is zero, it indicates that the demagnetization is successful; if it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero, it indicates that the demagnetization has failed, and proceeds to step S415.

[0122] Step S415, when demagnetization fails, adjusting the demagnetization signal.

[0123] In some embodiments, the control device adjusts the demagnetization signal when determining that the demagnetization fails.

[0124] In some optional embodiments, adjusting the degaussing signal includes adjusting the amplitude of the degaussing signal.

[0125] In some optional embodiments, adjusting the degaussing signal includes adjusting the degaussing time.

[0126] Subsequently, the process returns to step S405 to continue demagnetization, and uses the control device to send a demagnetization instruction to the signal generator until demagnetization is successfully achieved.

[0127] Through the above steps, the magnetic core piece can be demagnetized.

[0128] See also Fig.14 , which is a schematic diagram of the structure of the control device of the present disclosure in one embodiment.

[0129] like Fig.14 As shown, the control device includes a processor 51 and a memory 53. The processor 51 and the memory 53 can communicate with each other through a bus 52. A degaussing program can be stored in the memory 53. The processor 51 executes each step of the integrated chip test combined with the finished product test and the quality assurance test by running the degaussing program in the memory 53.

[0130] The bus 52 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, although only one thick line is used in the figure, it does not mean that there is only one bus or one type of bus.

[0131] In some embodiments, the processor 51 may be implemented as a central processing unit (CPU), a microprocessor unit (MCU), a system on chip (SoC), or a field programmable gate array (FPGA). The memory 53 may include a volatile memory for temporary storage of data when running a program, such as a random access memory (RAM). The memory 53 may also include a non-volatile memory (NVM) for data storage, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid-state disk (SSD).

[0132] In practical applications, the control device can be associated with various components in the demagnetization device to realize the detection of the Hall chip and the primary current train in the Hall current sensor and to apply a gradually attenuated demagnetization signal to the primary current train, thereby completing the demagnetization of the magnetic core.

[0133] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A demagnetization device for a Hall current sensor, characterized in that: The Hall current sensor comprises a mounting shell, a magnetic core, a primary current row, and a Hall chip, and the demagnetization device comprises: a reference sensor, associated with the primary current train, for collecting a magnetic field signal corresponding to a primary current flowing through the primary current train; and A signal processing unit is connected to the Hall chip, the reference sensor, and the primary current train, and is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions when the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core member detected by the Hall chip is non-zero when the primary current train is in a power-off state, and apply the demagnetization signal to the primary current train to complete the demagnetization of the magnetic core member; the demagnetization signal gradually decays from a set value to zero within a preset demagnetization time, wherein the signal amplitude in a later cycle of the demagnetization signal is smaller than the signal amplitude in a previous cycle.

2. The demagnetization device of the Hall current sensor according to claim 1, characterized in that: The reference sensor is a fluxgate sensor, which is sleeved on the primary current bus.

3. The demagnetization device of the Hall current sensor according to claim 1, characterized in that: The signal processing unit comprises: A control device connected to the Hall chip and the reference sensor; a signal generator, controlled by the control device and used to generate a degaussing signal; and The signal amplifier is connected to the signal generator and the primary current train, and is used to amplify the demagnetization signal generated by the signal generator and apply the amplified demagnetization signal to the primary current train.

4. The demagnetization device of the Hall current sensor according to claim 1, characterized in that: The demagnetization signal is a demagnetization voltage signal, and the demagnetization voltage signal is implemented as a sine wave signal, a square wave signal, a trapezoidal wave signal, or a triangle wave signal.

5. A demagnetization method for a Hall current sensor, characterized in that: A degaussing device for a Hall current sensor, the Hall current sensor comprising a mounting shell, a magnetic core, a primary current row, and a Hall chip, the degaussing device comprising a reference sensor and a signal processing unit, and the degaussing method comprising the following steps: Using the Hall chip to detect the magnetic flux of the magnetic core and using a reference sensor to collect a magnetic field signal corresponding to the primary current flowing through the primary current row; as well as When the primary current train is in a power-off state, when the magnetic field signal corresponding to the primary current flowing through the primary current train collected by the reference sensor is zero and the magnetic flux of the magnetic core member detected by the Hall chip is non-zero, the signal processing unit is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and the demagnetization signal is applied to the primary current train to complete the demagnetization of the magnetic core member; the demagnetization signal gradually decays from a set value to zero within a preset demagnetization time, wherein the signal amplitude in a later cycle of the demagnetization signal is smaller than the signal amplitude in a previous cycle.

6. The demagnetization method of the Hall current sensor according to claim 5, characterized in that: The signal processing unit is used to generate a demagnetization signal with decreasing amplitude and alternating positive and negative directions, and the demagnetization signal is applied to the primary current train, including the following steps: Producing a demagnetization signal with decreasing amplitude and alternating positive and negative directions; and The demagnetization signal is amplified and applied to the primary current train.

7. The demagnetization method of the Hall current sensor according to claim 5, characterized in that: The demagnetization method also includes the following steps: after the demagnetization is completed within a predetermined demagnetization time, determining whether the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and whether the magnetic flux of the magnetic core detected by the Hall chip is zero; if it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is zero, it indicates that the demagnetization is successful; if it is determined that the magnetic field signal corresponding to the primary current flowing through the primary current row collected by the reference sensor is zero and the magnetic flux of the magnetic core detected by the Hall chip is non-zero, it indicates that the demagnetization has failed.

8. The demagnetization method of the Hall current sensor according to claim 7, characterized in that: The demagnetization method further comprises the following steps: if the demagnetization is not completed within the predetermined demagnetization time, it indicates that the demagnetization has failed.

9. The demagnetization method of the Hall current sensor according to claim 7 or 8, characterized in that: The demagnetization method further comprises the following steps: when the demagnetization fails, adjusting the demagnetization signal by using the signal processing unit; the adjusting the demagnetization signal comprises at least one of adjusting the amplitude of the demagnetization signal and adjusting the demagnetization time.

10. The demagnetization method of the Hall current sensor according to claim 5, characterized in that: The demagnetization signal is a demagnetization voltage signal, and the demagnetization voltage signal is implemented as a sine wave signal, a square wave signal, a trapezoidal wave signal, or a triangle wave signal.

11. A control device, characterized in that: include: processor; A memory storing a degaussing program; Wherein, when the demagnetization program is executed by the processor, the demagnetization method of the Hall current sensor as claimed in any one of claims 5 to 10 is executed.

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