CN219392150U - Current sensor and electrical device - Google Patents

Abstract

The utility model relates to the technical field of sensors, in particular to a current sensor and electrical equipment. A current sensor of the present utility model includes: a shunt and a circuit board. The shunt comprises a first wiring terminal and a second wiring terminal, a pressure drop part is arranged between the first wiring terminal and the second wiring terminal, and a magnetic induction hole is arranged between the first wiring terminal and the pressure drop part; the circuit board is provided with a voltage-to-current conversion module and a Hall element, the voltage-to-current conversion module is electrically connected with the voltage drop part and used for measuring a first current value, the voltage-to-current conversion module is electrically connected with pins of the Hall element, and a magnetic induction part of the Hall element is positioned in the magnetic induction hole and used for measuring a second current value. The current sensor combines the current divider with the circuit board, so that the current value can be measured in two ways at the same time, two current sensors are not required to be installed, and the installation space of the current sensor is further saved on the basis of reliably detecting the current.

Description

Current sensor and electrical device

Technical Field

The utility model relates to the technical field of sensors, in particular to a current sensor and electrical equipment.

Background

The current sensor is a detecting device, can detect the related information of the detected current, and can convert the related information into an electric signal or other output in a required form which meets a certain standard according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The current sensor is widely applied in power systems, such as frequency converters, digital-to-analog converters, analog-to-digital converters, motor controllers, switching power supplies, uninterruptible power supplies, battery management systems, traditional industries, and the like. It will be appreciated that current sensors are very important components in electrical equipment, having a critical impact on maintaining the safety and stability of the power supply.

In the related art, it is often necessary to use two or even a plurality of current sensors for current detection inside an electrical apparatus with a high level of safety, so as to ensure the reliability of detection data. However, many electrical devices with higher safety levels often do not have enough installation space, so how to further save the installation space on the basis of reliably detecting the current has become a big problem to be solved in the industry.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a current sensor and an electric device, which can further save installation space on the basis of reliably detecting current.

A current sensor according to an embodiment of the first aspect of the present utility model includes:

the current divider comprises a first wiring terminal and a second wiring terminal, a pressure drop part is arranged between the first wiring terminal and the second wiring terminal, and a magnetic induction hole is arranged between the first wiring terminal and the pressure drop part;

the circuit board is provided with a voltage-to-current conversion module and a Hall element, the voltage-to-current conversion module is electrically connected with the voltage drop part and used for measuring a first current value, the voltage-to-current conversion module is electrically connected with pins of the Hall element, and a magnetic induction part of the Hall element is positioned in the magnetic induction hole and used for measuring a second current value.

According to some embodiments of the utility model, the voltage drop section comprises a first potential end, a second potential end and an impedance region, the voltage drop section is connected to the shunt via the first potential end and the second potential end, and the impedance region is arranged between the first potential end and the second potential end.

According to some embodiments of the utility model, the resistive region is made of a resistive material having a fixed resistance value.

According to some embodiments of the utility model, the resistive material is a manganese copper alloy.

According to some embodiments of the utility model, the magnetic induction hole coincides with the symmetry axis of the shunt.

According to some embodiments of the utility model, the magnetic induction part is suspended at the center of the magnetic induction hole.

According to some embodiments of the present utility model, the circuit board further includes a digital-to-analog conversion unit, and the digital-to-analog conversion unit is electrically connected to the voltage-to-current conversion module, and is configured to convert the first current value and the second current value from analog values to digital values.

According to some embodiments of the present utility model, the circuit board further includes a detection unit, and the detection unit is electrically connected to the voltage conversion module, and is configured to generate detection data according to the first current value and the second current value.

According to some embodiments of the utility model, the circuit board further comprises a data interface for outputting the detection data.

An electrical device according to an embodiment of the second aspect of the utility model, comprising a current sensor according to an embodiment of the first aspect.

The current sensor provided by the embodiment of the utility model has at least the following beneficial effects:

a current sensor of the present utility model includes: a shunt and a circuit board. The shunt comprises a first wiring terminal and a second wiring terminal, a pressure drop part is arranged between the first wiring terminal and the second wiring terminal, and a magnetic induction hole is arranged between the first wiring terminal and the pressure drop part; the circuit board is provided with a voltage-to-current conversion module and a Hall element, the voltage-to-current conversion module is electrically connected with the voltage drop part and used for measuring a first current value, the voltage-to-current conversion module is electrically connected with pins of the Hall element, and a magnetic induction part of the Hall element is positioned in the magnetic induction hole and used for measuring a second current value. According to the current sensor, the voltage-to-current conversion module arranged on the circuit board is matched with the voltage drop part arranged on the shunt, the first current value can be measured, the Hall element magnetic induction part arranged on the circuit board is positioned in the magnetic induction hole and can measure the second current value, so that the current can be reliably detected according to the first current value and the second current value, the shunt and the circuit board are used in combination, the current value can be measured in two ways at the same time, two current sensors are not required to be arranged, and the installation space of the current sensor is further saved on the basis of reliably detecting the current.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a three-dimensional structure of a current sensor according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a current sensor according to an embodiment of the present utility model;

FIG. 3 is an exploded view of another view of the current sensor according to the present utility model;

FIG. 4 is a schematic diagram of a circuit board structure of a current sensor according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a current sensor according to an embodiment of the present utility model;

reference numerals:

the current sensor 100, the shunt 110, the first terminal 111, the second terminal 112, the voltage drop 113, the first potential terminal 1131, the second potential terminal 1132, the impedance region 1133, the magnetic induction hole 114, the circuit board 120, the voltage-to-current conversion module 121, the hall element 122, the pin 1221, the magnetic induction part 1222, and the data interface 123.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The current sensor is a detecting device, can detect the related information of the detected current, and can convert the related information into an electric signal or other output in a required form which meets a certain standard according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The current sensor is widely applied in power systems, such as frequency converters, digital-to-analog converters, analog-to-digital converters, motor controllers, switching power supplies, uninterruptible power supplies, battery management systems, traditional industries, and the like. It will be appreciated that current sensors are very important components in electrical equipment, having a critical impact on maintaining the safety and stability of the power supply. The sensor for realizing current detection comprises a current sensor of the type such as a shunt, an inductance mutual inductance type or a Hall type. The current sensor in the form of a shunt is mainly used for a direct current circuit, and the principle is that the voltage difference between two ends of a shunt resistor is measured to calculate the current; the inductance mutual inductance type current sensor can be used for detecting alternating current or direct current, has less heating, can be used for large-current measurement but has high installation requirement, has low measurement precision due to the fact that a magnetic gap is not fixed in a wire diameter, and is particularly insufficient in small-current and low-voltage application scenes; the Hall type current sensor has a fixed current conductor product and has high measurement accuracy. The appearance of the non-fixed (through type) current sensor is similar to that of the mutual inductance type, and large current can be detected.

In the related art, it is often necessary to use two or even a plurality of current sensors for current detection inside an electrical apparatus with a high level of safety, so as to ensure the reliability of detection data. However, many electrical devices with higher safety levels often do not have enough installation space, so how to further save the installation space on the basis of reliably detecting the current has become a big problem to be solved in the industry.

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a current sensor and an electric device, which can further save installation space on the basis of reliably detecting current.

Referring to fig. 1 and 2, a current sensor 100 according to an embodiment of the first aspect of the present utility model includes: the shunt 110 and the circuit board 120. The shunt 110, the shunt 110 includes a first terminal 111 and a second terminal 112, a pressure drop portion 113 is disposed between the first terminal 111 and the second terminal 112, and a magnetic induction hole 114 is disposed between the first terminal 111 and the pressure drop portion 113; the circuit board 120, the circuit board 120 is provided with a voltage-to-current conversion module 121 and a hall element 122, the voltage-to-current conversion module 121 is electrically connected with the voltage drop portion 113 for measuring a first current value, the voltage-to-current conversion module 121 is electrically connected with a pin 1221 of the hall element 122, and a magnetic induction portion 1222 of the hall element 122 is located in the magnetic induction hole 114 for measuring a second current value.

It should be noted that, the shunt 110 is an instrument for measuring a direct current, and is made based on the principle that a direct current generates a voltage across a resistor when passing through the resistor, and it should be understood that the shunt 110 is generally used to enlarge a constant value low resistance for a current range, is generally connected in parallel with a moving coil of an ammeter or a galvanometer, and may be connected inside or outside the ammeter.

Referring to fig. 2 and 5, in some exemplary embodiments of the present utility model, the shunt 110 includes a first terminal 111 and a second terminal 112, a voltage drop portion 113 is disposed between the first terminal 111 and the second terminal 112, and a magnetic induction hole 114 is disposed between the first terminal 111 and the voltage drop portion 113, where the first terminal 111 and the second terminal 112 are used to integrally connect the current sensor 100 to a circuit to be tested. The voltage drop portion 113 is mainly based on ohm's law, and a certain area is set in the voltage drop portion 113 by using a material with a certain impedance, so that the two ends of the voltage drop portion 113 form a first potential difference. It should be clear that the first potential difference is formed at two ends of the voltage drop portion 113 and transferred to the voltage conversion module 121 of the circuit board 120, that is, the first potential difference is converted into a corresponding first current by the voltage conversion module 121, and then the current value of the first current is further detected by the voltage conversion module 121, so that the first current value can be measured. In addition, it should be clear that a magnetic induction hole 114 is provided between the first terminal 111 and the voltage drop portion 113, the magnetic induction hole 114 is used for being matched with a hall element 122 disposed on the circuit board 120, the hall element 122 generates a second potential difference through the intensity of an induced magnetic field, and the second potential difference induced by the hall element 122 is transferred to the voltage-to-current conversion module 121 of the circuit board 120 due to the electrical connection between the voltage-to-current conversion module 121 and the pin 1221 of the hall element 122, so that the second potential difference can be converted into a corresponding second current through the voltage-to-current conversion module 121, and then the current value of the second current is further detected through the voltage-to-current conversion module 121, so that the second current value can be measured. It should be appreciated that the magnetic induction hole 114 may be rectangular, circular, polygonal, or other shapes, and the magnetic induction hole 114 in some preferred embodiments is rectangular because the corresponding magnetic field formed in the rectangular magnetic induction hole 114 is relatively uniform in shape, which is conducive to the induction of a magnetic field by the magnetic induction portion 1222 of the hall element 122.

Referring to fig. 2 and fig. 4, it should be further described that the circuit board 120 is provided with a voltage conversion module 121 and a hall element 122, the voltage conversion module 121 is electrically connected to the voltage drop portion 113 for measuring a first current value, the voltage conversion module 121 is electrically connected to a pin 1221 of the hall element 122, and a magnetic induction portion 1222 of the hall element 122 is located in the magnetic induction hole 114 for measuring a second current value. The voltage-to-current conversion module 121 refers to a module that converts a voltage signal into a current signal, and it should be understood that the voltage-to-current conversion module 121 may be an analog-to-digital converter, may be designed based on a voltage-to-current conversion circuit, or may be another module that converts a voltage signal into a current signal. It should be noted that in some embodiments of the present utility model, the voltage-to-current conversion circuit is implemented in the form of negative feedback, which may be either current series negative feedback or current parallel negative feedback, and is mainly used in industrial control and many sensor applications. It should be understood that the voltage-to-current conversion module 121 specifically functions to convert the output voltage of the multiplier-divider into a dc current and measure the dc current. In some embodiments, the voltage-to-current conversion module 121 may be composed of a self-oscillation modulation amplifier and a power detection amplifier.

According to some more specific embodiments of the present utility model, the voltage converting module 121 may be an analog-to-digital converter, i.e. an a/D converter (Analog to Digital Converter, ADC), also referred to as an analog-to-digital conversion component. It should be noted that, the analog-to-digital converter generally refers to an electronic element that converts an analog signal into a digital signal, and the typical analog-to-digital converter converts an input voltage signal into an output digital signal, and since the digital signal itself has no practical meaning and only represents a relative size, any analog-to-digital converter needs a reference analog quantity as a standard of conversion, the reference standard is the maximum convertible signal size, and the output digital quantity represents the size of the input signal relative to the reference signal. Similarly, the digital-to-analog converter can process the received voltage analog signal according to a preset operation rule to obtain a corresponding current value. Accordingly, in some embodiments of the present utility model, the digital-to-analog converter may be used as the voltage-to-current conversion module 121, and convert the first potential difference into a corresponding first current, and measure the first current value. The magnetic induction hole 114 disposed between the first terminal 111 and the voltage drop portion 113 is matched with the hall element 122 disposed on the circuit board 120, the hall element 122 generates a second potential difference by sensing the intensity of the magnetic field, and the second potential difference induced by the hall element 122 is transferred to the voltage conversion module 121 of the circuit board 120 due to the electrical connection between the voltage conversion module 121 and the pin 1221 of the hall element 122, so that the second potential difference can be converted into a corresponding second current through the voltage conversion module 121, and the second current value is measured.

It should be noted that, the first current value and the second current value are both detected values detected by the current sensor 100 in the embodiment of the present utility model. The first current value may be obtained by converting the first potential difference formed at the two ends of the voltage drop portion 113 into a corresponding first current through the voltage-to-current conversion module 121, and further detecting the current value of the first current through the voltage-to-current conversion module 121, or if the voltage-to-current conversion module 121 is specifically an analog-to-digital converter, the first potential difference formed at the two ends of the voltage drop portion 113 may be directly processed according to a preset operation rule through the analog-to-digital converter after the first potential difference is obtained, so as to obtain the corresponding first current value through calculation. The second current value may be obtained by converting the second potential difference induced by the hall element 122 into a corresponding second current through the voltage-to-current conversion module 121 after the second potential difference is induced by the hall element 122 and transmitted to the voltage-to-current conversion module 121 of the circuit board 120, and further detecting the current value of the second current through the voltage-to-current conversion module 121, and similarly, if the voltage-to-current conversion module 121 is specifically an analog-to-digital converter, the second potential difference may also be processed directly according to a preset operation rule after the second potential difference formed by the hall element 122 is obtained through the analog-to-digital converter, so as to obtain the corresponding second current value. It should be appreciated that the manner of detecting the first current value and the second current value is various and may include, but is not limited to, the specific embodiments described above.

Referring to fig. 1 to 3, a current sensor 100 of the present utility model includes: the shunt 110 and the circuit board 120. The shunt 110 comprises a first terminal 111 and a second terminal 112, a pressure drop portion 113 is arranged between the first terminal 111 and the second terminal 112, and a magnetic induction hole 114 is arranged between the first terminal 111 and the pressure drop portion 113; the circuit board 120 is provided with a voltage-to-current conversion module 121 and a hall element 122, the voltage-to-current conversion module 121 is electrically connected with the voltage drop portion 113 for measuring a first current value, the voltage-to-current conversion module 121 is electrically connected with a pin 1221 of the hall element 122, and a magnetic induction portion 1222 of the hall element 122 is located in the magnetic induction hole 114 for measuring a second current value. According to the current sensor 100 disclosed by the utility model, the voltage-to-current conversion module 121 arranged on the circuit board 120 is matched with the voltage drop part 113 arranged on the shunt 110, the first current value can be measured, the magnetic induction part 1222 of the Hall element 122 arranged on the circuit board 120 is positioned in the magnetic induction hole 114 and can measure the second current value, so that the current can be reliably detected according to the first current value and the second current value, and the shunt 110 and the circuit board 120 are combined for use, so that the current value can be measured in two ways simultaneously, the two current sensors 100 are not required to be arranged, and the installation space of the current sensor 100 is further saved on the basis of reliably detecting the current.

Referring to fig. 5, according to some embodiments of the present utility model, the voltage drop portion 113 includes a first potential end 1131, a second potential end 1132, and an impedance region 1133, where the voltage drop portion 113 is connected to the shunt 110 via the first potential end 1131 and the second potential end 1132, and the impedance region 1133 is disposed between the first potential end 1131 and the second potential end 1132. It should be noted that, the voltage drop portion 113 is mainly based on ohm's law, and a section of impedance region 1133 is disposed in the voltage drop portion 113 by using a material with a certain impedance, so that a first potential difference is formed between the first potential end 1131 and the second potential end 1132 of the voltage drop portion 113. It should be clear that the first potential difference is formed at two ends of the voltage drop portion 113 and transferred to the voltage conversion module 121 of the circuit board 120, that is, the first potential difference is converted into a corresponding first current by the voltage conversion module 121, and then the current value of the first current is further detected by the voltage conversion module 121, so that the first current value can be measured. It should be clear that, the shunt 110 includes the first terminal 111 and the second terminal 112, where the first terminal 111 and the second terminal 112 are used to connect the current sensor 100 to the circuit to be tested, and the voltage drop portion 113 is disposed between the first terminal 111 and the second terminal 112, and the voltage drop portion 113 can form a first potential difference between the first potential end 1131 and the second potential end 1132 based on the impedance area 1133, so after receiving the first potential difference, the voltage-to-current conversion module 121 can calculate the current passing between the first terminal 111 and the second terminal 112, that is, the current passing in the current sensor 100, based on ohm law, so that the first current passing in the current sensor 100 can be measured through the voltage-to-current conversion module 121. It should be emphasized that, in the current sensor 100 of the present utility model, the voltage-to-current conversion module 121 provided by the circuit board 120 is matched with the voltage drop portion 113 provided by the shunt 110 to measure the first current value, and the magnetic induction portion 1222 of the hall element 122 provided by the circuit board 120 is located in the magnetic induction hole 114 to measure the second current value, so that the current can be reliably detected according to the first current value and the second current value, and it is clear that the shunt 110 and the circuit board 120 in the embodiment of the present utility model can be combined to use the two ways to measure the current value at the same time, and the installation space of the current sensor 100 is further saved on the basis of reliably detecting the current without installing two current sensors 100.

Referring to fig. 5, according to some embodiments provided by the present utility model, the impedance region 1133 is made of an impedance material with a fixed resistance value. It should be noted that, the voltage drop portion 113 is disposed between the first terminal 111 and the second terminal 112, and the voltage drop portion 113 can form a first potential difference between the first potential end 1131 and the second potential end 1132 based on the impedance region 1133, so after the voltage conversion module 121 receives the first potential difference, the voltage conversion module 121 can calculate, according to the resistance value of the impedance region 1133 and the first potential difference, a current passing between the first terminal 111 and the second terminal 112, that is, a current passing in the current sensor 100 based on ohm's law. Therefore, in order to facilitate calculation of the voltage-to-current conversion module 121, some preferred embodiments use a resistive material with a fixed resistance value as the material of the resistive region 1133. It should be clear that, since the voltage converting module 121 is calculated according to the resistance value of the impedance region 1133 and the first potential difference, when the resistance value of the impedance region 1133 is a constant value, a value with a change rule or a value that can be detected in real time, the voltage converting module 121 can successfully complete the calculation, and if the resistance value of the impedance region 1133 is a constant value, the calculation process of the voltage converting module 121 can be simplified to a greater extent, and therefore, the impedance region 1133 is made of an impedance material with a fixed resistance, which is a preferred embodiment of the present utility model.

According to some embodiments of the utility model, the resistive material is a manganese copper alloy. It should be noted that the alloy resistor is mainly used for detecting the current, and is therefore also called a current detection resistor, a sampling resistor, or the like. The alloy resistor is mainly made of copper alloy, each manufacturer has different material proportions during production and research and development, and the common alloy resistor materials in the market are as follows: manganese copper alloy, iron chromium aluminum alloy, constantan alloy, nickel chromium alloy, kama alloy, nickel copper alloy, and the like, it being understood that the alloy resistance has low resistance, high stability, high power, and the like. The main alloy resistor is a chip alloy resistor, and the main alloy material is copper, and the chip alloy resistor are made of constantan, manganese copper and the like by adding other materials. Other auxiliary materials are numerous, but the primary properties are determined by the alloy material itself. It is pointed out that manganese copper is a kind of precise resistance alloy, and is usually supplied as wire, and there are also small amount of plates and strips, so that it has wide application in various instruments and meters, and at the same time, it is an ultrahigh pressure sensitive material, and its upper limit of pressure measurement can be up to 500Pa. The manganese copper has good piezoresistive effect and is widely applied to pressure measurement in high-temperature and high-pressure environments such as detonation, high-speed impact, dynamic fracture, new material synthesis and the like. The resistance change of the manganese copper is approximately in a linear function relation with the external pressure (namely, the piezoresistive coefficient K is approximately constant), the resistance temperature coefficient is small, and the pressure measurement under the dynamic high pressure can be converted into the measurement of the resistance change of the manganese copper through a sensor made of the manganese copper serving as a sensitive element. Therefore, in some preferred embodiments of the present utility model, a manganese-copper alloy is selected as the resistive material of the resistive region 1133.

Referring to fig. 2-4, in accordance with some embodiments provided by the present utility model, magnetic induction aperture 114 coincides with the axis of symmetry of shunt 110. It should be noted that, the symmetry axes of the shunt 110 are respectively overlapped with the four center points of the first terminal 111, the magnetic induction hole 114, the voltage drop portion 113 and the second terminal 112, and penetrate through the first terminal 111, the magnetic induction hole 114, the voltage drop portion 113 and the second terminal 112 of the shunt 110. It should be understood that the shunt 110 is rotationally symmetric about an axis of symmetry, and that the magnetic induction aperture 114 coincides with the axis of symmetry of the shunt 110, specifically the axis of symmetry of the shunt 110 passes through the center point of the magnetic induction aperture 114. It should be noted that the hall element 122 is a hall effect based magnetic sensor that can be used to detect magnetic fields and their variations and can be used in a variety of magnetic field related applications. The hall elements 122 have many advantages, such as firm structure, small volume, light weight, long life, convenient installation, low power consumption, high frequency (up to 1 MHZ), shock resistance, and resistance to contamination or corrosion by dust, oil, water vapor, salt mist, etc. Since the magnetic induction hole 114 disposed between the first terminal 111 and the voltage drop portion 113 is matched with the hall element 122 disposed on the circuit board 120, the hall element 122 generates a second potential difference by sensing the intensity of the magnetic field, and since the voltage conversion module 121 is electrically connected with the pin 1221 of the hall element 122, the second potential difference induced by the hall element 122 is transferred to the voltage conversion module 121 of the circuit board 120, that is, the second potential difference can be converted into a corresponding second current by the voltage conversion module 121, and a second current value is measured, so that the magnetic field induced by the hall element 122 is associated with the finally measured second current value, when the magnetic induction hole 114 coincides with the symmetry axis of the shunt 110, the magnetically sensitive portion 1222 of the hall element 122 is located in the magnetic induction hole 114, a uniform magnetic field generated in the current sensor 100 can be sensed, the magnetically sensitive portion 1222 is helped to sense the magnetic field to form the second potential difference, and the second current value is further measured more accurately.

Referring to fig. 2 and 3, according to some embodiments provided by the present utility model, magnetic induction section 1222 is suspended in a central position of magnetic induction hole 114. It should be noted that, because the magnetic induction hole 114 disposed between the first terminal 111 and the voltage drop portion 113 is matched with the hall element 122 disposed on the circuit board 120, the hall element 122 generates the second potential difference by sensing the intensity of the magnetic field, and because the voltage conversion module 121 is electrically connected with the pin 1221 of the hall element 122, the second potential difference induced by the hall element 122 is transferred to the voltage conversion module 121 of the circuit board 120, the second potential difference can be converted into the corresponding second current by the voltage conversion module 121, and the second current value is measured, and therefore the magnetic field induced by the hall element 122 is related to the finally measured second current value. Therefore, if the magnetic induction portion 1222 is suspended at the center of the magnetic induction hole 114, the magnetic induction portion 1222 of the hall element 122 can sufficiently induce the magnetic field in the magnetic induction hole 114, so that the second potential difference induced by the hall element 122 more accurately reflects the current passing between the first terminal 111 and the second terminal 112, i.e. the current passing through the current sensor 100, so that the detected second current value is more accurate.

According to some embodiments of the present utility model, the circuit board 120 may further include a digital-to-analog conversion unit, which is electrically connected to the voltage-to-current conversion module 121, for converting the first current value and the second current value from analog values to digital values. According to some more specific embodiments of the present utility model, the voltage converting module 121 may be an analog-to-digital converter, and the digital-to-analog converter may process the received voltage analog signal according to a preset operation rule to obtain a corresponding current value. It should be noted that, if the voltage-to-current conversion module 121 specifically refers to not a digital-to-analog converter but a voltage-to-current conversion circuit, the circuit board 120 may be further configured with a digital-to-analog conversion unit, where the digital-to-analog conversion unit is electrically connected to the voltage-to-current conversion module 121 and is configured to convert the first current value and the second current value from analog to digital. It should be understood that the current value detected by the current sensor 100 is generally more intuitive in the form of a digital quantity, so that some preferred embodiments of the present utility model can electrically connect the digital-to-analog conversion unit with the voltage-to-current conversion module 121 to facilitate the conversion of the current value from an analog quantity to a digital quantity.

According to some embodiments of the present utility model, the circuit board 120 may further include a detection unit electrically connected to the voltage-to-current conversion module 121, for generating detection data according to the first current value and the second current value. It should be understood that the detecting unit is configured to generate the detection data according to the first current value and the second current value, and specifically, the detecting unit is capable of obtaining reliable detection data based on the first current value and the second current value. According to some exemplary embodiments of the present utility model, the first current value may be obtained by converting the first potential difference formed at the two ends of the voltage drop portion 113 into a corresponding first current through the voltage conversion module 121, and further detecting the current value of the first current through the voltage conversion module 121, and if the voltage conversion module 121 is specifically an analog-to-digital converter, the first potential difference formed at the two ends of the voltage drop portion 113 may also be directly processed according to a preset operation rule through the analog-to-digital converter after the first potential difference is obtained, so as to obtain the corresponding first current value. The second current value may be obtained by converting the second potential difference induced by the hall element 122 into a corresponding second current through the voltage-to-current conversion module 121 after the second potential difference is induced by the hall element 122 and transmitted to the voltage-to-current conversion module 121 of the circuit board 120, and further detecting the current value of the second current through the voltage-to-current conversion module 121, and similarly, if the voltage-to-current conversion module 121 is specifically an analog-to-digital converter, the second potential difference may also be processed directly according to a preset operation rule after the second potential difference formed by the hall element 122 is obtained through the analog-to-digital converter, so as to obtain the corresponding second current value. It is clear that the current value can be measured in two ways simultaneously by combining the current divider 110 and the circuit board 120 in the embodiment of the utility model, and the installation space of the current sensor 100 is further saved on the basis of reliably detecting the current without installing two current sensors 100. It should be understood that the first current value and the second current value are both currents passing between the first terminal 111 and the second terminal 112, that is, detection values of currents passing in the current sensor 100, and the first current value and the second current value are respectively measured based on different manners, but are both currents passing in the current sensor 100. Therefore, in some preferred embodiments, after the first current value and the second current value are measured by the method of the foregoing embodiments, the first current value and the second current value may be further analyzed in the detection unit, so as to obtain reliable detection data, where the method of analyzing the first current value and the second current value may be to output an average value of the first current value and the second current value as the detection data; the method may further comprise the steps of detecting a plurality of sets of first current values and a plurality of sets of second current values, screening out the detection values with excessive errors, and obtaining a median of the remaining detection values. It should be understood that the manner in which the detection unit analyzes the first current value and the second current value to obtain reliable detection data is multiple and diverse, and may include, but is not limited to, the specific embodiments described above.

Referring to fig. 3 and 4, according to some embodiments provided by the present utility model, the circuit board 120 may further include a data interface 123, where the data interface 123 is configured to output the detection data. It should be noted that the detection unit can obtain reliable detection data based on the first current value and the second current value, and thus the data interface 123 for outputting the detection data is required to be configured on the circuit board 120 in some embodiments of the present utility model. The data interface 123 refers to an interface that outputs data to a data connection line when data transmission is performed, for example, various types of interfaces such as an RS-232 interface, an RS-485 interface, a COM interface, or a USB interface. It should be appreciated that the type of data interface 123 configured by the circuit board 120 may include, but is not limited to, the specific embodiments set forth above.

According to an embodiment of the second aspect of the utility model, the electrical device comprises the current sensor 100 of the embodiment of the first aspect. It should be understood that the electrical equipment (Electrical Equipment) is a generic term for equipment such as generators, transformers, power lines, circuit breakers, and the like in a power system. The important role of electric power in our life and production cannot be ignored, brings great convenience to us, becomes an important energy source in our production and life, and is the most critical factor for enabling electric power to normally run and be conveyed in various electric power application scenes. In the related art, two or more current sensors 100 are often used to detect current in an electrical device with a high safety level, so as to ensure the reliability of detection data, where the electrical device with a high safety level may include, but is not limited to, components such as a battery pack, an electric controller, and a charger in a new energy automobile. For such higher safety level electrical devices, if no reliable measures are taken for current detection, this may lead to the occurrence of safety hazards. However, many electrical devices with higher safety levels often do not have a sufficient installation space inside, so in the current sensor 100 shown in the first embodiment of the present utility model, the voltage-to-current conversion module 121 provided by the circuit board 120 is matched with the voltage drop portion 113 provided by the shunt 110 to measure a first current value, and the magnetic sensing portion 1222 of the hall element 122 provided by the circuit board 120 is located in the magnetic induction hole 114 to measure a second current value, so that the current is reliably detected according to the first current value and the second current value, and it is clear that the shunt 110 and the circuit board 120 in the embodiment of the present utility model can be combined to measure the current values in two ways simultaneously, and the installation space of the current sensor 100 is further saved on the basis of reliably detecting the current without installing two current sensors 100.

The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the core concept of the utility model. The foregoing is merely a preferred embodiment of the utility model, and it should be noted that, due to the limited text expressions, there is objectively no limit to the specific structure, and that, for a person skilled in the art, modifications, adaptations or variations may be made without departing from the principles of the present utility model, and the above technical features may be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present utility model.

Claims (10)

1. A current sensor, comprising:

the current divider comprises a first wiring terminal and a second wiring terminal, a pressure drop part is arranged between the first wiring terminal and the second wiring terminal, and a magnetic induction hole is arranged between the first wiring terminal and the pressure drop part;

the circuit board is provided with a voltage-to-current conversion module and a Hall element, the voltage-to-current conversion module is electrically connected with the voltage drop part and used for measuring a first current value, the voltage-to-current conversion module is electrically connected with pins of the Hall element, and a magnetic induction part of the Hall element is positioned in the magnetic induction hole and used for measuring a second current value.

2. The current sensor of claim 1, wherein the voltage drop section includes a first potential end, a second potential end, and an impedance region, the voltage drop section being connected to the shunt via the first potential end and the second potential end, the impedance region being disposed between the first potential end and the second potential end.

3. The current sensor of claim 2, wherein the resistive region is made of a resistive material having a fixed resistance value.

4. A current sensor according to claim 3, wherein the resistive material is a manganese copper alloy.

5. The current sensor of claim 1, wherein the magnetic induction aperture coincides with an axis of symmetry of the shunt.

6. The current sensor of claim 5, wherein the magnetically sensitive portion is suspended in a centered position of the magnetically induced aperture.

7. The current sensor according to any one of claims 1 to 6, wherein the circuit board further comprises a digital-to-analog conversion unit electrically connected to the voltage-to-current conversion module for converting the first current value and the second current value from analog values to digital values.

8. The current sensor of claim 7, wherein the circuit board further comprises a detection unit electrically connected to the voltage-to-current conversion module for generating detection data according to the first current value and the second current value.

9. The current sensor of claim 8, wherein the circuit board further comprises a data interface for outputting the detection data.

10. An electrical device, characterized in that it comprises a current sensor according to any one of claims 1 to 9.