Direct current acquisition device

Abstract

The utility model relates to the field of current measurement, and discloses a direct current acquisition device, which is used for improving the universality of the direct current acquisition device. The direct current acquisition device comprises at least one sampling module and a processing module, wherein each sampling module is in communication connection with the processing module; the sampling module comprises an annular magnetic core and a Hall sensor, the annular magnetic core is provided with an opening air gap with a preset size, the Hall sensor is arranged at the opening air gap, and the Hall sensor is used for outputting an induced voltage signal; and the processing module is used for determining the direct current value in the direct current cable detected by each sampling module according to each acquired induced voltage signal.

Description

Technical Field

[0001] The utility model relates to the technical field of current measurement, in particular to a direct current acquisition device. Background Art

[0002] At present, for application scenarios that require DC current collection, different products use different collection solutions; among them, for centralized inverters or string inverters, DC current is mainly measured through current transformers, and for combiner boxes, manganese-copper shunts are mainly used to measure DC current. Different models need to select current transformers or manganese-copper shunts of corresponding specifications according to different current collection ranges, and their versatility is not strong. Utility Model Content

[0003] The utility model provides a direct current acquisition device, which is used for improving the versatility of the direct current acquisition device.

[0004] A first aspect of an embodiment of the utility model provides a direct current acquisition device, comprising:

[0005] At least one sampling module and a processing module, each sampling module is respectively connected to the processing module in communication;

[0006] The sampling module includes an annular magnetic core and a Hall sensor, the annular magnetic core is provided with an open air gap of a preset size, the Hall sensor is arranged at the open air gap, and the Hall sensor is used to output an induced voltage signal;

[0007] The processing module is used to determine the DC current value in the DC cable detected by each sampling module according to each collected induced voltage signal.

[0008] In a feasible implementation manner, the processing module includes:

[0009] A processor unit, the processor unit being communicatively connected with each Hall sensor;

[0010] The processor unit is used to determine the DC current value in the DC cable detected by each sampling module according to each induced voltage signal.

[0011] In a feasible implementation manner, the processing module further includes:

[0012] A signal conditioning unit, the signal conditioning unit being communicatively connected to the processor unit and the at least one sampling module respectively;

[0013] The signal conditioning unit is used to filter out noise from the induced voltage signal sent by each sampling module, and send each induced voltage signal after noise filtering to the processor unit.

[0014] In a feasible implementation manner, the processing module further includes:

[0015] A multiplexing unit, wherein the multiplexing unit is communicatively connected with the processor unit and the at least one sampling module respectively;

[0016] The multiplexing unit is used to input each induced voltage signal into the processor unit in a multiplexing manner.

[0017] In a feasible implementation manner, the processing module includes:

[0018] A processor unit, a signal conditioning unit and a multiplexing unit, wherein the multiplexing unit is communicatively connected to the signal conditioning unit and the processor unit respectively, and the signal conditioning unit is communicatively connected to the at least one sampling module;

[0019] The signal conditioning unit is used to filter out noise from the induced voltage signal sent by each sampling module, and send each induced voltage signal after the noise is filtered out to the multiplexing unit;

[0020] The multiplexing unit is used to input the induced voltage signals sent by the signal conditioning unit into the processor unit in a multiplexing manner;

[0021] The processor unit is used to determine the DC current value in the DC cable detected by each sampling module according to each input induced voltage signal.

[0022] In a feasible implementation manner, the diameter of each annular magnetic core in at least two sampling modules is the same.

[0023] In a feasible implementation manner, the size of the open air gap of each annular magnetic core is different.

[0024] In a feasible implementation manner, the size of the open air gap of each annular magnetic core in at least two sampling modules is the same.

[0025] In a feasible implementation manner, the diameter of the annular magnetic core in each sampling module is different.

[0026] In a feasible implementation manner, the sampling module further includes a magnetic core protective shell, which is disposed outside the annular magnetic core and is used to protect the annular magnetic core.

[0027] In the technical solution provided by the embodiment of the utility model, the DC current acquisition device includes at least one sampling module and a processing module, each sampling module is respectively connected to the processing module in communication; the sampling module includes a ring-shaped magnetic core and a Hall sensor, the ring-shaped magnetic core is provided with an open air gap of a preset size, the Hall sensor is arranged at the open air gap, and the Hall sensor is used to output an induced voltage signal; the processing module is used to determine the DC current value in the DC cable detected by each sampling module according to each collected induced voltage signal. In the embodiment of the utility model, the induced voltage signal is output by the Hall sensor arranged at the open air gap of the ring-shaped magnetic core, and then converted into a DC current value through the processing module. The open air gaps of different sizes correspond to different current measurement ranges, and there is no need to replace the Hall sensor, thereby improving the versatility of the DC current acquisition device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a DC current collection device in an embodiment of the utility model;

[0029] Figure 2 Another schematic diagram of the DC current collection device in the embodiment of the utility model;

[0030] Figure 3 Another schematic diagram of the DC current collection device in the embodiment of the utility model;

[0031] Figure 4 This is another schematic diagram of the DC current collection device in the embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model provides a direct current acquisition device, which is used for improving the versatility of the direct current acquisition device.

[0033] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here, for example, can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] See also Figure 1 , a schematic diagram of a DC current acquisition device provided by an embodiment of the utility model, specifically comprising:

[0035] At least one sampling module 100 and a processing module 200, each sampling module 100 is respectively connected to the processing module 200 for communication;

[0036] The sampling module 100 includes a ring-shaped magnetic core 101 and a Hall sensor 102, wherein the ring-shaped magnetic core 101 is provided with an open air gap of a preset size, and the Hall sensor 102 is provided at the open air gap, and the Hall sensor 102 is used to output an induced voltage signal;

[0037] The processing module 200 is used to determine the DC current value in the DC cable detected by each sampling module 100 according to each collected induced voltage signal.

[0038] Among them, when there are two or more sampling modules 100, the number of annular magnetic cores is also two or more, and the size of the open air gap of each annular magnetic core can be the same or different, and the specific size is not limited here. In order to improve the versatility of the Hall sensor, the Hall sensor corresponding to each annular magnetic core in this application is of the same model, that is, the range of magnetic field strength that the Hall sensor can respond to is fixed.

[0039] In this embodiment, the Hall sensor arranged at the open air gap of the annular magnetic core outputs an induced voltage signal, which is then converted into a DC current value through a processing module. Open air gaps of different sizes correspond to different current measurement ranges. There is no need to replace the Hall sensor, thereby improving the versatility of the DC current acquisition device.

[0040] It is understandable that when using the combination of Hall sensor and toroidal core as a sampling module for current collection, the DC cable needs to pass through the toroidal core, and the Hall sensor detects the magnetic field generated by the DC current and the toroidal core, and outputs different voltages according to the change of the magnetic field, so that the Hall sensor responds to different DC currents and outputs different voltages. In addition, there is no need to use conventional current transformers or manganese-copper shunts, and the use of universal Hall sensors reduces hardware costs.

[0041] It should be noted that an output switching logic is set in the processing module, and the induced voltage signal is input into the output switching logic to perform digital-to-analog conversion and numerical conversion, so as to obtain the final DC current value.

[0042] It should also be noted that the Hall sensors in the various schematic diagrams in the embodiments of the present application are only for indicating their positions and do not limit their sizes. In practice, the Hall sensors are relatively small and will be completely within the magnetic field formed by the cross-section of the annular magnetic core. No specific limitations are made here.

[0043] In a possible implementation, Figure 1As shown, the processing module 200 includes:

[0044] A processor unit 201, wherein the processor unit 201 is communicatively connected with each Hall sensor 102;

[0045] The processor unit 201 is used to determine the DC current value in the DC cable detected by each sampling module 100 according to each induced voltage signal.

[0046] In a possible implementation, Figure 2 As shown, the processing module 200 also includes:

[0047] A signal conditioning unit 202, wherein the signal conditioning unit 202 is communicatively connected to the processor unit 201 and the at least one sampling module 100;

[0048] The signal conditioning unit 202 is used to filter out noise from the induced voltage signal sent by each sampling module 100 , and send each induced voltage signal after noise filtering to the processor unit 201 .

[0049] It should be noted that the signal conditioning unit 202 will receive the induced voltage signal sent by each sampling module 100 (i.e., the induced voltage signal sent by the Hall sensor). These induced voltage signals may include some interference noise and need to be eliminated. Therefore, the processing module 200 can first filter out the noise of the received induced voltage signal through the signal conditioning unit 202, and then input the induced voltage signal after noise filtering into the processor unit 201 for processing.

[0050] It is understandable that the signal conditioning unit 202 performs noise filtering to reduce interference and improve the acquisition accuracy of the induced voltage signal.

[0051] In a possible implementation, Figure 3 As shown, the processing module 200 also includes:

[0052] A multiplexing unit 203, wherein the multiplexing unit 203 is communicatively connected with the processor unit 201 and the at least one sampling module 100 respectively;

[0053] The multiplexing unit 203 is used to input each induced voltage signal into the processor unit 201 in a multiplexing manner.

[0054] It should be noted that when the number of analog-to-digital converter (ADC) interfaces of the processor unit is limited and when there are many acquisition channels and they cannot meet the demand, a multiplexing unit 203 is required to complete the input of multiple induced voltage signals and then output a single induced voltage signal to the ADC interface of the processor unit 201 in sequence to achieve multi-channel acquisition.

[0055] It is understandable that when the number of ADC interfaces of the processor unit 201 exceeds the number of the sampling modules 100 , the demand can be met, and the multiplexing unit 203 can be used for conversion, or the multiplexing unit 203 can be not used for conversion.

[0056] The number of channels of the multiplexing unit 203 must be greater than or equal to the number of sampling modules in the DC current acquisition device, so as to avoid conflicts between induced voltage signals acquired by multiple sampling modules when the number of sampling modules is large.

[0057] In a possible implementation, Figure 4 As shown, the processing module 200 includes:

[0058] A processor unit 201, a signal conditioning unit 202 and a multiplexing unit 203, wherein the multiplexing unit 203 is respectively connected to the signal conditioning unit 202 and the processor unit 201 in communication, and the signal conditioning unit 202 is connected to the at least one sampling module 100 in communication;

[0059] The signal conditioning unit 202 is used to filter out noise from the induced voltage signal sent by each sampling module 100, and send each induced voltage signal after the noise is filtered out to the multiplexing unit 203;

[0060] The multiplexing unit 203 is used to input the induced voltage signals sent by the signal conditioning unit 202 into the processor unit 201 in a multiplexing manner;

[0061] The processor unit 201 is used to determine the DC current value in the DC cable detected by each sampling module according to each input induced voltage signal.

[0062] Then the DC current acquisition device specifically includes:

[0063] At least one sampling module 100, a processor unit 201, a signal conditioning unit 202 and a multiplexing unit 203, wherein the multiplexing unit 203 is respectively connected to the signal conditioning unit 202 and the processor unit 201 in communication, and the signal conditioning unit 201 is connected to the at least one sampling module 100 in communication;

[0064] The sampling module 100 includes a ring-shaped magnetic core 101 and a Hall sensor 102, wherein the ring-shaped magnetic core 101 is provided with an open air gap of a preset size, and the Hall sensor 102 is provided at the open air gap, and the Hall sensor 102 is used to output an induced voltage signal;

[0065] The signal conditioning unit 202 is used to filter out noise from the induced voltage signal sent by each sampling module 100, and send each induced voltage signal after the noise is filtered out to the multiplexing unit 203;

[0066] The multiplexing unit 203 is used to input the induced voltage signals sent by the signal conditioning unit 202 into the processor unit 201 in a multiplexing manner;

[0067] The processor unit 201 is used to determine the DC current value in the DC cable detected by each sampling module according to each input induced voltage signal.

[0068] In the embodiment of the utility model, a Hall sensor arranged at the open air gap of the annular magnetic core outputs an induced voltage signal, which is then converted into a DC current value through a processing module. Open air gaps of different sizes correspond to different current measurement ranges, and there is no need to replace the Hall sensor, thereby improving the versatility of the DC current acquisition device.

[0069] It should be noted that when the DC current acquisition device includes both the signal conditioning unit 202 and the multiplexing unit 203, the multiplexing unit 203 needs to be arranged between the signal conditioning unit 202 and the processor unit 201, and adjacent units can communicate with each other.

[0070] In a feasible implementation manner, the diameter of each annular magnetic core in at least two sampling modules is the same.

[0071] It can be understood that when the number of sampling modules is greater than or equal to 2, the sampling ranges of each sampling module can be the same, or the sampling ranges of each sampling module can be different. When the number is greater than or equal to 3, the sampling ranges of some sampling modules can also be the same. The specific details are not limited here.

[0072] When the collection range of at least two sampling modules needs to be adjusted, the specifications of the annular magnetic core can be adjusted to change the induced magnetic field generated by the annular magnetic core under different DC currents. The specifications of the annular magnetic core mainly include two dimensions: diameter and open air gap. In this embodiment, the diameter of the annular magnetic core can be unified first.

[0073] In a feasible implementation manner, the size of the open air gap of each annular magnetic core is different.

[0074] Under the premise of the same diameter, when the collection ranges of at least two sampling modules need to be adjusted to be different, the size of the open air gap of the annular magnetic core is changed. The size of the open air gap may refer to the straight-line distance between the center points of two cross sections at the notch of the annular magnetic core.

[0075] It is understandable that the cross-sectional area of ​​the annular magnetic core needs to be larger than the size of the Hall sensor so that the Hall sensor is completely within the magnetic field formed by the annular magnetic core. At this time, the current acquisition range of each sampling module is proportional to the size of the opening air gap of the corresponding annular magnetic core. Under the premise that the diameter of each annular magnetic core is the same, the larger the opening air gap of the annular magnetic core, the larger the current sampling range of the sampling module.

[0076] It should be noted that the acquisition range of each sampling module is proportional to the size of the open air gap of the corresponding toroidal core, and satisfies the following first formula: B = nA / (80*ε), where B represents the magnetic field strength of the Hall sensor, in GS; ε represents the size of the open air gap of the toroidal core, in m; A represents the current size, in A; n represents the number of turns, and in this application, only one DC cable passes through each toroidal core, so n is 1. Therefore, the magnitude of the current in the DC cable satisfies the second formula: A = B*(80*ε), B represents the magnetic field strength of the Hall sensor, in GS; ε represents the size of the open air gap of the toroidal core, in m; A represents the current size, in A.

[0077] It is understandable that, according to the second formula, the current sampling range of the sampling module is positively correlated with the size of the open air gap of the annular magnetic core. The larger the open air gap, the larger the current sampling range of the sampling module. The current sampling range can be combined according to actual needs, so as to set up sampling modules with different current sampling ranges.

[0078] In this embodiment, by controlling the size of the open air gap of the annular magnetic core, currents in different ranges can be measured, making the same type of Hall sensor more versatile, and the annular magnetic core can also be selected according to actual conditions, reducing hardware costs.

[0079] In a feasible implementation manner, the size of the open air gap of each annular magnetic core in at least two sampling modules is the same.

[0080] When the collection range of at least two sampling modules needs to be adjusted, the specifications of the annular magnetic core can be adjusted to change the induced magnetic field generated by the annular magnetic core under different DC currents. The specifications of the annular magnetic core mainly include two dimensions: diameter and open air gap. In this embodiment, the size of the open air gap of the annular magnetic core can be unified first.

[0081] In a feasible implementation manner, the diameter of the annular magnetic core in each sampling module is different.

[0082] It should be noted that, under the premise of the same size of the open air gap, when the collection ranges of at least two sampling modules need to be adjusted to be different, the diameter of the annular magnetic core is changed. The diameter can be the inner diameter or outer diameter of the annular magnetic core, and only the inner diameter or the outer diameter needs to be adjusted for each annular magnetic core.

[0083] It is understandable that the cross-sectional area of ​​the annular core needs to be larger than the size of the Hall sensor so that the Hall sensor is completely within the magnetic field formed by the annular core. At this time, the current collection range of each sampling module is proportional to the diameter of the corresponding annular core. Under the premise that the opening air gap of each annular core is the same, the larger the diameter of the annular core, the larger the current sampling range of the sampling module.

[0084] It should be noted that, for the convenience of measurement, the outer diameter of the annular core is used as the diameter for calculation. In the process of selecting the annular core, the outer diameter of the annular core is easier to compare intuitively, thereby determining the specifications of the annular core more quickly and improving comparison efficiency.

[0085] It should also be noted that when there are multiple sampling modules, the open air gaps and diameters of all annular cores can also be set to be the same, that is, the current sampling range of each sampling module is the same, which can meet the purpose of simultaneously measuring multiple DC cables within the same range.

[0086] In a feasible implementation, the Hall sensor in each sampling module may respond to a fixed range of the induced magnetic field strength in the corresponding annular magnetic core.

[0087] In this embodiment, the Hall sensor can be a linear Hall sensor. If the number of sampling modules is greater than or equal to two, then the number of Hall sensors is also greater than or equal to two. In order to improve versatility, in this embodiment, all Hall sensors use the same model, and the induced magnetic field strength range that a Hall sensor of one model can respond to is fixed. Therefore, the induced magnetic field strength range that two or more Hall sensors can respond to is the same.

[0088] It can be understood that when a DC cable passes through any toroidal core and current flows through the DC cable, the toroidal core will generate an induced magnetic field due to electromagnetic induction. Combined with the magnetic field of the toroidal core itself, the magnetic field in which the Hall sensor is located will change. The Hall sensor will output a Hall voltage according to the change of the magnetic field, that is, an induced voltage signal.

[0089] It should be noted that since there is an induced magnetic field inside the annular core, the magnitude of the induced magnetic field is proportional to the magnitude of the current in the DC cable. Therefore, the Hall sensor can use the induced magnetic field in the annular core and the magnetic field transformation of the annular core itself to output Hall voltages of different magnitudes.

[0090] It should also be noted that if the sampling range of the sampling module needs to be adjusted over a larger range, the models of the Hall sensors in at least two sampling modules can also be adjusted to increase the range of induced magnetic field strengths to which the Hall sensors can respond, thereby increasing the sampling range of the sampling module. The specifics are not limited here.

[0091] In this embodiment, the Hall sensor does not make electrical contact with the DC cable being measured, does not affect the DC cable being measured, does not consume the power of the DC cable being measured, has no measurement loss, and can measure a wider current range. In addition, in this embodiment, the output of the Hall sensor can be open-circuited, which is safer to use and more reliable.

[0092] In a feasible implementation manner, the sampling module further includes a magnetic core protective shell, which is disposed outside the magnetic core and is used to protect the annular magnetic core.

[0093] It is understandable that because the annular magnetic core is relatively brittle and easily damaged by external force, in order to better protect the magnetic core, a core protective shell can be provided on the outside of the annular magnetic core. The core protective shell can be a plastic shell or a shell made of other materials, as long as it can protect the magnetic core from being easily damaged by external force. For example, it can be a resin shell, and the specific details are not limited here.

[0094] It should be noted that, for the sampling module, since the Hall sensor needs to be set at the open air gap of the magnetic core, the relative position relationship between the Hall sensor and the annular magnetic core can be limited by the shell structure of the sampling module, which is not specifically limited here.

[0095] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0096] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0098] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A direct current collection device, characterized in that: include: At least one sampling module and a processing module, each sampling module is respectively connected to the processing module in communication; The sampling module includes an annular magnetic core and a Hall sensor, the annular magnetic core is provided with an open air gap of a preset size, the Hall sensor is arranged at the open air gap, and the Hall sensor is used to output an induced voltage signal; The processing module is used to determine the DC current value in the DC cable detected by each sampling module according to each collected induced voltage signal.

2. The DC current acquisition device according to claim 1, characterized in that: The processing module comprises: A processor unit, the processor unit being communicatively connected with each Hall sensor; The processor unit is used to determine the DC current value in the DC cable detected by each sampling module according to each induced voltage signal.

3. The DC current acquisition device according to claim 2, characterized in that: The processing module also includes: A signal conditioning unit, the signal conditioning unit being communicatively connected to the processor unit and the at least one sampling module respectively; The signal conditioning unit is used to filter out noise from the induced voltage signal sent by each sampling module, and send each induced voltage signal after noise filtering to the processor unit.

4. The DC current acquisition device according to claim 2, characterized in that: The processing module also includes: A multiplexing unit, the multiplexing unit being communicatively connected with the processor unit and the at least one sampling module respectively; The multiplexing unit is used to input each induced voltage signal into the processor unit in a multiplexing manner.

5. The direct current acquisition device according to claim 1, characterized in that: The processing module comprises: A processor unit, a signal conditioning unit and a multiplexing unit, wherein the multiplexing unit is communicatively connected to the signal conditioning unit and the processor unit respectively, and the signal conditioning unit is communicatively connected to the at least one sampling module; The signal conditioning unit is used to filter out noise from the induced voltage signal sent by each sampling module, and send each induced voltage signal after the noise is filtered out to the multiplexing unit; The multiplexing unit is used to input the induced voltage signals sent by the signal conditioning unit into the processor unit in a multiplexing manner; The processor unit is used to determine the DC current value in the DC cable detected by each sampling module according to each input induced voltage signal.

6. The direct current acquisition device according to claim 1, characterized in that: The diameter of each annular magnetic core in at least two sampling modules is the same.

7. The direct current acquisition device according to claim 6, characterized in that: The size of the open air gap of each toroidal core is different.

8. The direct current acquisition device according to claim 1, characterized in that: The size of the open air gap of each annular magnetic core in at least two sampling modules is the same.

9. The direct current acquisition device according to claim 8, characterized in that: The diameter of the toroidal core in each sampling module is different.

10. The direct current acquisition device according to any one of claims 1 to 9, characterized in that: The sampling module also includes a magnetic core protective shell, which is arranged outside the annular magnetic core and is used to protect the annular magnetic core.

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