TMR closed-loop current sensor

Abstract

The utility model provides a TMR closed loop current sensor, comprising a housing, a magnetic component installed in the housing, the magnetic component comprising a PCB, a Hall, a connector, a magnetic core skeleton and a magnetic core, the magnetic core skeleton comprising a fixed rod and fixed seats, the fixed seats are respectively fixed at two end portions of the fixed rod, the side surface of the fixed seat is provided with a magnetic core positioning groove used for positioning the magnetic core, and the magnetic core positioning groove is provided with a magnetic core. Any magnetic core framework is provided with a Hall fixing seat, the Hall is installed on the Hall fixing seat, the magnetic core is provided with two sections including a first magnetic core section and a second magnetic core section, the end of the first magnetic core section is provided with a first magnetic core inserting end and a first air gap forming end, and the end of the second magnetic core section is provided with a second air gap forming end. The magnetic core is more convenient and faster to assemble and has a better shielding effect, meanwhile, a ferrite shielding block does not need to be additionally installed, the production process is optimized, the production efficiency is effectively improved, and due to the fact that the ferrite shielding block does not need to be installed again, the production cost is reduced, and the production efficiency is improved. And more time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the field of electronic components, in particular to a TMR closed-loop current sensor. Background Art

[0002] As the core equipment at the end of the photovoltaic industry chain, the market shipments of photovoltaic inverters directly benefit from the growth of downstream photovoltaic power generation installed capacity.

[0003] As the core component of the inverter, the current sensor is mainly used to detect the AC current on the DC side and the inverter side. With the fierce competition in the photovoltaic industry, the cost requirements for current sensors are getting higher and higher. At present, in addition to Hall and fluxgate current sensors, TMR is the most cost-effective. Compared with Hall, it has a fast response time, good dynamic characteristics, and has more advantages in small current applications. At the same time, it has a simple structure, easy assembly, and a cost advantage over fluxgate. The market prospects of TMR sensors are broad in the future.

[0004] like Figure 1-5 As shown, the existing closed-loop current sensor has the following design disadvantages:

[0005] 1. The magnetic core in the closed-loop current sensor of the prior art is divided into three parts, which need to be assembled three times during assembly, which is complicated and affects production efficiency. In addition, the air gap opening of the magnetic core is left on the side of the product, which will affect the shielding effect of the Hall or TMR. Therefore, a ferrite shielding block is added in the prior art to increase the shielding effect. However, such a design will add one more process during production, affecting the timeliness;

[0006] 2. In the prior art, the core frame and the PCB are located on the side of the frame, and the PCB area is small, making it difficult to implement other solutions;

[0007] 3. The Hall and TMR on the core skeleton in the prior art can only be placed on the side. This design will result in the coil on the core skeleton being unable to pass through them when being wound, so there is no shielding effect and an external shielding block needs to be installed. In addition, the core skeleton is placed on the side with the TMR, and the PCB board area is small, making it difficult to add other protection circuits. At the same time, the maximum current measurement is 600A. Utility Model Content

[0008] In order to solve the above technical problems, the utility model proposes a TMR closed-loop current sensor, which is more convenient and quick to assemble and has a better shielding effect. At the same time, there is no need to install a ferrite shielding block, which optimizes the production process, saves product costs, and effectively improves production efficiency. Since there is no need to install a ferrite shielding block, it is also more time-saving and labor-saving.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] A TMR closed-loop current sensor comprises a shell, wherein a magnetic component is installed in the shell, and the characteristics are as follows: the magnetic component comprises a PCB board, a Hall, a connector, a magnetic core skeleton and a magnetic core, wherein the magnetic core is installed in the magnetic core skeleton to achieve positioning, wherein the magnetic core is connected to the PCB board via a connector, wherein the magnetic core skeleton comprises a fixing rod and a fixing seat, wherein the fixing seats are respectively fixed at two ends of the fixing rod, wherein a magnetic core positioning groove for positioning the magnetic core is provided on the side of the fixing seat, wherein the magnetic core skeleton is provided with two magnetic core upper skeletons and a magnetic core lower skeleton, wherein a Hall fixing seat is provided on any magnetic core skeleton, wherein the Hall fixing seat is fixed at the middle of the fixing rod and is located between the fixing seats, wherein the Hall fixing seat is installed On the Hall fixed seat, the magnetic core is provided with two sections, namely the first section of the magnetic core and the second section of the magnetic core. The first section of the magnetic core is respectively provided with a first magnetic core plug-in end and a first air gap forming end, and the second section of the magnetic core is respectively provided with a second magnetic core plug-in end and a second air gap forming end. When the first section of the magnetic core and the second section of the magnetic core are inserted into the magnetic core positioning groove, the first section of the magnetic core and the second section of the magnetic core are relatively pushed until the first section of the magnetic core and the second section of the magnetic core are clamped and fixed. At this time, an air gap is formed between the first air gap forming end and the second air gap forming end on the first section of the magnetic core and the second section of the magnetic core, and the air gap is located in the middle position of the magnetic core.

[0011] In the above structure: the TMR closed-loop current sensor proposed in the utility model includes a shell, a magnetic component is installed in the shell, and the magnetic component includes a PCB board, a Hall, a connector, a magnetic core skeleton and a magnetic core, wherein the magnetic core skeleton includes a fixing rod and a fixing seat, the fixing seats are respectively fixed at the two ends of the fixing rod, and a magnetic core positioning groove is opened on the side of the fixing seat for realizing the installation and positioning of the magnetic core. The magnetic core skeleton is provided with two, namely the upper magnetic core skeleton and the lower magnetic core skeleton. During installation, one of the upper magnetic core skeleton or the lower magnetic core skeleton is selected to fix a Hall fixing seat for installing the Hall. In this application, the lower magnetic core skeleton is selected to install the Hall fixing seat. The Hall fixing seat is fixed in the middle of the fixing rod and is located between the fixing seats. Therefore, the Hall is fixed in the middle position of the fixing rod. When installing the Hall, there is no need to install a ferrite shielding block, because when winding, the Hall is in the middle position of the enameled wire, which has its own shielding effect, saving time and effort. Among them, the magnetic core is provided with two sections, and the existing magnetic core is composed of three parts. Therefore, it needs to be assembled three times during assembly, which is complicated and affects the production efficiency. The present application arranges the magnetic core into two parts, and the assembly can be completed at one time during assembly, making it more convenient to assemble. The magnetic cores are respectively a first section magnetic core and a second section magnetic core. The ends of the first section magnetic core are respectively provided with a first magnetic core pair plug-in end and a first air gap forming end, and the two ends of the second section magnetic core are respectively provided with a second magnetic core pair plug-in end and a second air gap forming end. When the first section magnetic core and the second section magnetic core are inserted into the magnetic core positioning groove, the first section magnetic core and the second section magnetic core are relatively pushed until the first core pair plug-in end and the second core pair plug-in end on the first section magnetic core and the second section magnetic core are clamped and fixed. At this time, an air gap is formed between the first air gap forming end and the second air gap forming end on the first section magnetic core and the second section magnetic core, and the air gap is located in the middle position of the magnetic core, leaving the air gap of the magnetic core in the middle position of the product, which has a better shielding effect than the prior art, and at the same time, there is no need to install a ferrite shielding block, which effectively saves production costs.

[0012] Further: the shell includes an upper shell and a lower shell, the PCB board is provided with a rectangular through hole, the upper shell is provided with a rectangular fixing block, the lower shell is provided with a rectangular fixing groove, the rectangular fixing block passes through the rectangular through hole and the gap between the upper magnetic core skeleton and the lower magnetic core skeleton in sequence and is fixed in the fixing groove.

[0013] In the above structure: the shell includes an upper shell and a lower shell, which can be disassembled. The connection between the upper shell and the lower shell mainly relies on a rectangular fixing block and a rectangular fixing groove. The rectangular fixing block passes through the rectangular through hole and the gap between the upper magnetic core frame and the lower magnetic core frame in sequence and is fixed in the fixing groove, thereby realizing the clamping fixation of the two.

[0014] Furthermore: the upper core skeleton and the lower core skeleton are respectively provided with skeleton positioning columns, the skeleton positioning columns are fixed to the side of the fixing seat, and the PCB board is fixedly connected to the upper core skeleton and the lower core skeleton through the skeleton positioning columns.

[0015] In the above structure: the skeleton positioning column is used to realize the connection and fixation between the magnetic core skeleton and the PCB board. The skeleton positioning column is installed above the magnetic core skeleton, which can be better fixed to the PCB board. It is directly fixed on the top of the magnetic core skeleton to facilitate later disassembly and maintenance.

[0016] Further: the Hall fixing seat is fixed on the lower frame of the magnetic core, the Hall fixing seat is fixed to the middle of the fixing rod and is located between the fixing seats, a Hall fixing groove is opened on the Hall fixing seat, and the Hall is fixed in the Hall fixing groove.

[0017] In the above structure: the present application fixes the Hall fixing seat on the lower frame of the magnetic core, a rectangular Hall fixing slot is provided on the Hall fixing seat, and the Hall is fixed in the Hall fixing slot.

[0018] Furthermore: the first magnetic core segment and the second magnetic core segment are formed by riveting long magnetic cores and short magnetic cores alternately in layers, and the long magnetic cores or segment magnetic cores on the first magnetic core pair plug-in ends and the second magnetic core pair plug-in ends are respectively provided with rounded corners and chamfered structures.

[0019] In the above structure: the magnetic core is changed from the original three-part plug-in design to the two-part plug-in design of the cost application, and the magnetic core structures of different lengths are obtained by stamping, namely, a long magnetic core and a short magnetic core. A certain distance difference is made on the first magnetic core plug-in end and the second magnetic core plug-in end of the two, and the long magnetic core or segment magnetic core on the first magnetic core plug-in end and the second magnetic core plug-in end are respectively provided with rounded corners and chamfered structures, and then the magnetic core structures of different lengths are riveted through riveting equipment, a layer of long magnetic core and a layer of short magnetic core, and riveted into layers, which is convenient for the riveted cores to be plugged in. During assembly, the first magnetic core plug-in end and the second magnetic core plug-in end can be directly plugged in.

[0020] Further: a ground pin is provided on the second magnetic core, and the ground pin is connected to the PCB board.

[0021] In the above structure: a ground pin is arranged on the second section of the magnetic core. Compared with the prior art, the ground pin is arranged to be welded at one short end instead of at two ends that need to be welded, thereby improving production efficiency.

[0022] Furthermore: the PCB board is printed with an anti-reverse connection protection circuit and a boost circuit for raising the coil drive voltage and increasing the current measurement range. The anti-reverse connection circuit is connected to a voltage follower. The voltage signal in the anti-reverse connection circuit is isolated from the front end through the voltage follower to reduce interference with the front-stage circuit, increase the back-end driving capability, and automatically adjust its own impedance to match the front-end and back-end circuits.

[0023] In the above structure: due to the design of the magnetic core skeleton, the area of ​​the PCB board is increased, so an expansion circuit can be added thereto. The PCB board of the present application is printed with an anti-reverse connection protection circuit and a boost circuit for raising the coil driving voltage and increasing the current measurement range. The anti-reverse connection protection circuit can also realize signal protection. In order to prevent the product from being damaged during electrostatic discharge, protection devices VS1 and VS2 are respectively added to the output end and the power supply end to realize signal protection. The voltage signal in the anti-reverse connection circuit is isolated from the front end through the voltage follower to reduce interference with the front-stage circuit, increase the back-end driving capability, and automatically adjust its own impedance to match the front-end and back-end circuits.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The present application designs the magnetic core into two sections, which is more convenient and quicker to assemble than the prior art. By reserving the air gap of the magnetic core in the middle position, it has a better shielding effect, and there is no need to install a ferrite shielding block. Since the ferrite shielding block is cancelled, a production process is optimized and product costs are saved. The grounding pin of the magnetic core in the present application is also changed from welding both ends to welding one end, which effectively improves production efficiency.

[0026] This application places the Hall hole on the core skeleton in the middle position. When installing the Hall, there is no need to install a ferrite shielding block, because when winding, the Hall is in the middle position of the enameled wire, which has a self-shielding effect, saving time and effort;

[0027] The PCB area of ​​this application is larger, and other solutions will not be unable to be implemented due to limited PCB area. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a closed-loop current sensor in the prior art;

[0029] Figure 2 is an exploded diagram of a magnetic core in the prior art;

[0030] Figure 3 It is a schematic diagram of the magnetic core assembly structure in the prior art;

[0031] Figure 4 It is a schematic diagram of the structure of a magnetic core skeleton in the prior art;

[0032] Figure 5is an exploded view of a magnetic component in the prior art;

[0033] Figure 6 It is a schematic diagram of the overall structure of this application;

[0034] Figure 7 It is an exploded view of the magnetic core;

[0035] Figure 8 It is a schematic diagram of the magnetic core assembly structure;

[0036] Fig. 9 It is a schematic diagram of the core skeleton structure;

[0037] Fig.10 It is an exploded view of the magnetic component;

[0038] Fig.11 This is the connection diagram of the anti-reverse connection protection circuit;

[0039] Fig.12 It is the connection diagram of the boost circuit;

[0040] Fig.13 This is the connection diagram of the voltage follower circuit.

[0041] List of reference numerals:

[0042] 1. Upper shell; 2. PCB board; 3. Upper skeleton of magnetic core; 4. Connector; 5. First section of magnetic core; 6. Second section of magnetic core; 7. Lower skeleton of magnetic core; 8. Lower shell; 9. Air gap; 10. Ground pin; 11. First magnetic core to plug-in end; 12. First air gap forming end; 13. Second magnetic core to plug-in end; 14. Second air gap forming end 14; 15. Fixing seat; 16. Fixing rod; 17. Hall fixing seat; 18. Core positioning groove; 19. Skeleton positioning column. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0044] like Figure 6-13As shown, the utility model proposes a TMR closed-loop current sensor, including a shell, a magnetic component is installed in the shell, the magnetic component includes a PCB board 2, a Hall, a connector 4, a magnetic core skeleton and a magnetic core, the magnetic core is installed in the magnetic core skeleton to achieve positioning, the magnetic core is connected to the PCB board 2 through the connector 4, the magnetic core skeleton includes a fixing rod 16 and a fixing seat 15, the fixing seat 15 is respectively fixed at the two ends of the fixing rod 16, a magnetic core positioning groove 18 for positioning the magnetic core is opened on the side of the fixing seat 15, the magnetic core skeleton is provided with two magnetic core upper skeletons 3 and magnetic core lower skeletons 7, any magnetic core skeleton is provided with a Hall fixing seat 17, the Hall fixing seat 17 is fixed in the middle of the fixing rod 16 and is located between the fixing seats 15, the Hall is installed in the Hall On the fixing seat 17, the magnetic core is provided with two sections, namely the first section magnetic core 5 and the second section magnetic core 6, the ends of the first section magnetic core 5 are respectively provided with the first magnetic core pair plug-in end 11 and the first air gap forming end 12, and the two ends of the second section magnetic core 6 are respectively provided with the second magnetic core pair plug-in end 13 and the second air gap forming end 14. When the first section magnetic core 5 and the second section magnetic core 6 are inserted into the magnetic core positioning groove 18, the first section magnetic core 5 and the second section magnetic core 6 are relatively pushed until the first core pair plug-in end 11 and the second core pair plug-in end 13 on the first section magnetic core 5 and the second section magnetic core 6 are clamped and fixed, at this time, an air gap 9 is formed between the first air gap forming end 12 and the second air gap forming end 14 on the first section magnetic core 5 and the second section magnetic core 6, and the air gap 9 is located in the middle position of the magnetic core.

[0045] The TMR closed-loop current sensor proposed in the utility model includes a shell, in which a magnetic component is installed, and the magnetic component includes a PCB board 2, a Hall, a connector 4, a magnetic core skeleton and a magnetic core, wherein the magnetic core skeleton includes a fixing rod 16 and a fixing seat 15, the fixing seat 15 is respectively fixed on the two ends of the fixing rod 16, and a magnetic core positioning groove 18 is opened on the side of the fixing seat 15 for realizing the installation and positioning of the magnetic core. The magnetic core skeleton is provided with two magnetic core upper skeletons 3 and magnetic core lower skeletons 7, respectively. During installation, a Hall fixing seat 17 for installing the Hall is fixed on the upper magnetic core skeleton 3 or the lower magnetic core skeleton 7. In this application, the lower magnetic core skeleton 7 is selected to install the Hall fixing seat 17, and the Hall fixing seat 17 is fixed in the middle of the fixing rod 16 and is located between the fixing seats 15, so the Hall is fixed at the middle position of the fixing rod 16. When installing the Hall, there is no need to install a ferrite shielding block, because when winding, the Hall is in the middle position of the enameled wire, which has a self-shielding effect, saving time and effort. Among them, the magnetic core is provided with two sections. The existing magnetic core is composed of three parts. Therefore, it needs to be assembled three times during assembly, which is complicated and affects the production efficiency. The present application sets the magnetic core into two parts. During assembly, the assembly can be completed at one time, making it more convenient to assemble. The magnetic cores are respectively a first section magnetic core 5 and a second section magnetic core 6. The ends of the first section magnetic core 5 are respectively provided with a first magnetic core plug-in end 11 and a first air gap forming end 12. The ends of the second section magnetic core 6 are respectively provided with a second magnetic core plug-in end 13 and a second air gap forming end 14. When the first section magnetic core 5 and the second section magnetic core 6 are inserted When arranged in the magnetic core positioning groove 18, the first magnetic core section 5 and the second magnetic core section 6 are pushed relative to each other until the first magnetic core pair plug-in ends 11 and the second magnetic core pair plug-in ends 13 on the first magnetic core section 5 and the second magnetic core section 6 are clamped and fixed. At this time, an air gap 9 is formed between the first air gap forming end 12 and the second air gap forming end 14 on the first magnetic core section 5 and the second magnetic core section 6. The air gap 9 is located in the middle position of the magnetic core, and the air gap 9 of the magnetic core is left in the middle position of the product. Compared with the prior art, it has a better shielding effect and there is no need to install a ferrite shielding block, which effectively saves production costs.

[0046] In this embodiment: the shell includes an upper shell 1 and a lower shell 8, the PCB board 2 is provided with a rectangular through hole, the upper shell 1 is provided with a rectangular fixing block, and the lower shell 8 is provided with a rectangular fixing groove, and the rectangular fixing block passes through the rectangular through hole and the gap between the upper magnetic core skeleton and the lower magnetic core skeleton in sequence and is fixed in the fixing groove.

[0047] The shell includes an upper shell 1 and a lower shell 8, which can be disassembled. The connection between the upper shell 1 and the lower shell 8 mainly relies on a rectangular fixing block and a rectangular fixing groove. The rectangular fixing block passes through the rectangular through hole and the gap between the upper magnetic core frame and the lower magnetic core frame in sequence and is fixed in the fixing groove, thereby realizing the card-connection and fixation of the two.

[0048] In this embodiment: the upper core skeleton 3 and the lower core skeleton 7 are respectively provided with skeleton positioning columns 19, and the skeleton positioning columns 19 are fixed to the side of the fixing seat 15. The PCB board 2 is fixedly connected to the upper core skeleton 3 and the lower core skeleton 7 through the skeleton positioning columns 19.

[0049] The skeleton positioning column 19 is used to connect and fix the magnetic core skeleton to the PCB board 2. The skeleton positioning column 19 is installed above the magnetic core skeleton to better fix it to the PCB board 2. It is directly fixed on the top of the magnetic core skeleton to facilitate later disassembly and maintenance.

[0050] In this embodiment: the Hall fixing seat 17 is fixed on the lower frame 7 of the magnetic core, the Hall fixing seat 17 is fixed to the middle of the fixing rod 16 and is located between the fixing seats 15, and a Hall fixing groove is opened on the Hall fixing seat 17, and the Hall is fixed in the Hall fixing groove.

[0051] In the present application, the Hall fixing seat 17 is fixedly installed on the lower frame 7 of the magnetic core. A rectangular Hall fixing groove is provided on the Hall fixing seat 17, and the Hall is fixed in the Hall fixing groove.

[0052] In this embodiment: the first magnetic core segment 5 and the second magnetic core segment 6 are formed by riveting long magnetic cores and short magnetic cores alternately in layers, and the long magnetic cores or segment magnetic cores on the first magnetic core pair plug-in end 11 and the second magnetic core pair plug-in end 13 are respectively provided with rounded corners and chamfered structures.

[0053] The magnetic core is changed from the original three-part plug-in design to the two-part plug-in design of this application, and the magnetic core structures of different lengths are obtained by stamping, namely, a long magnetic core and a short magnetic core. A certain distance difference is made on the first magnetic core plug-in end 11 and the second magnetic core plug-in end 13 of the two, and the long magnetic core or segment magnetic core on the first magnetic core plug-in end 11 and the second magnetic core plug-in end 13 are respectively provided with rounded corners and chamfered structures, and then the magnetic core structures of different lengths are riveted through a riveting device, a layer of long magnetic core and a layer of short magnetic core, and riveted into layers, which is convenient for the riveted cores to be plugged in. During assembly, the first magnetic core plug-in end 11 and the second magnetic core plug-in end 13 can be directly plugged in.

[0054] In this embodiment, a ground pin 10 is provided on the second magnetic core 6 , and the ground pin 10 is connected to the PCB board 2 .

[0055] A ground pin 10 is provided on the second section of the magnetic core 6. Compared with the prior art, the ground pin 10 has two ends that need to be welded, but is instead welded to a short position, thereby improving production efficiency.

[0056] In this embodiment: the PCB board 2 is printed with an anti-reverse connection protection circuit and a boost circuit for raising the coil drive voltage and increasing the current measurement range. The anti-reverse connection circuit is connected to a voltage follower. The voltage signal in the anti-reverse connection circuit is isolated from the front end through the voltage follower to reduce interference with the front-stage circuit, increase the back-end driving capability, and automatically adjust its own impedance to match the front-end and rear-stage circuits.

[0057] Due to the design of the magnetic core skeleton, the area of ​​PCB board 2 is increased, so an expansion circuit can be added thereto. The PCB board 2 of the present application is printed with an anti-reverse connection protection circuit and a boost circuit for raising the coil driving voltage and increasing the current measurement range. The anti-reverse connection protection circuit can also realize signal protection. In order to prevent the product from being damaged during electrostatic discharge, protection devices VS1 and VS2 are respectively added to the output end and the power supply end to realize signal protection. The voltage signal in the anti-reverse connection circuit is isolated from the front end through a voltage follower to reduce interference with the front-stage circuit, increase the back-end driving capability, and automatically adjust its own impedance to match the front-end and back-end circuits.

[0058] The present application designs the magnetic core into two sections, which is more convenient and quicker to assemble than the prior art. By reserving the air gap 9 of the magnetic core in the middle position, it has a better shielding effect, and there is no need to install a ferrite shielding block. Since the ferrite shielding block is cancelled, a production process is optimized and product costs are saved. The grounding pin 10 of the magnetic core in the present application is also changed from welding both ends to welding one end, which effectively improves production efficiency.

[0059] This application places the Hall hole on the core skeleton in the middle position. When installing the Hall, there is no need to install a ferrite shielding block, because when winding, the Hall is in the middle position of the enameled wire, which has a self-shielding effect, saving time and effort;

[0060] The PCB area of ​​this application is larger, and other solutions will not be unable to be implemented due to limited PCB area.

[0061] The above is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A TMR closed-loop current sensor, comprising a housing, wherein a magnetic component is installed in the housing, characterized in that: The magnetic component comprises a PCB board (2), a Hall, a connector (4), a magnetic core frame and a magnetic core. The magnetic core is installed in the magnetic core frame to achieve positioning. The magnetic core is connected to the PCB board (2) via the connector (4). The magnetic core frame comprises a fixing rod (16) and a fixing seat (15). The fixing seat (15) is respectively fixed to the two ends of the fixing rod (16). The side of the fixing seat (15) is provided with a magnetic core positioning groove (18) for positioning the magnetic core. The magnetic core frame is provided with two magnetic core upper frames (3) and magnetic core lower frames (7). A Hall fixing seat (17) is provided on any magnetic core frame. The Hall fixing seat (17) is fixed to the middle of the fixing rod (16) and is located between the fixing seats (15). The Hall is installed on the Hall fixing seat (17). The magnetic core is provided with two sections, namely a first section magnetic frame and a second section magnetic frame. The invention relates to a magnetic core (5) and a second magnetic core (6), wherein the first magnetic core (5) is provided with a first magnetic core pair plug-in end (11) and a first air gap forming end (12) at the end thereof, and the second magnetic core (6) is provided with a second magnetic core pair plug-in end (13) and a second air gap forming end (14) at the two ends thereof. When the first magnetic core (5) and the second magnetic core (6) are inserted into the magnetic core positioning groove (18), the first magnetic core (5) and the second magnetic core (6) are relatively pushed until the first magnetic core pair plug-in end (11) and the second magnetic core pair plug-in end (13) on the first magnetic core (5) and the second magnetic core (6) are clamped and fixed. At this time, an air gap (9) is formed between the first air gap forming end (12) and the second air gap forming end (14) on the first magnetic core (5) and the second magnetic core (6), and the air gap (9) is located in the middle of the magnetic core.

2. The TMR closed-loop current sensor according to claim 1, characterized in that: The shell comprises an upper shell (1) and a lower shell (8); a rectangular through hole is provided on the PCB board (2); a rectangular fixing block is provided in the upper shell (1); a rectangular fixing groove is provided on the lower shell (8); the rectangular fixing block passes through the rectangular through hole and the gap between the upper magnetic core skeleton and the lower magnetic core skeleton in sequence and is fixed in the fixing groove.

3. The TMR closed-loop current sensor according to claim 1, characterized in that: The upper magnetic core frame (3) and the lower magnetic core frame (7) are respectively provided with frame positioning columns (19), the frame positioning columns (19) are fixed to the side of the fixing seat (15), and the PCB board (2) is fixedly connected to the upper magnetic core frame (3) and the lower magnetic core frame (7) via the frame positioning columns (19).

4. The TMR closed-loop current sensor according to claim 1, characterized in that: The Hall fixing seat (17) is fixed on the lower frame (7) of the magnetic core, the Hall fixing seat (17) is fixed to the middle part of the fixing rod (16) and is located between the fixing seats (15), and a Hall fixing groove is provided on the Hall fixing seat (17), and the Hall is fixed in the Hall fixing groove.

5. The TMR closed-loop current sensor according to claim 1, characterized in that: The first magnetic core segment (5) and the second magnetic core segment (6) are both formed by alternately layering and riveting long magnetic cores and short magnetic cores, and the long magnetic cores or segment magnetic cores on the first magnetic core pair plug-in end (11) and the second magnetic core pair plug-in end (13) are respectively provided with rounded corners and chamfered corner structures.

6. The TMR closed-loop current sensor according to claim 1, characterized in that: A ground pin (10) is provided on the second magnetic core (6), and the ground pin (10) is connected to the PCB board (2).

7. The TMR closed-loop current sensor according to claim 1, characterized in that: The PCB board (2) is printed with an anti-reverse connection protection circuit for preventing reverse connection and a boost circuit for raising the coil drive voltage and increasing the current measurement range. The anti-reverse connection circuit is connected to a voltage follower. The voltage signal in the anti-reverse connection circuit is isolated from the front end through the voltage follower to reduce interference with the front-stage circuit, increase the rear-end driving capability, and automatically adjust its own impedance to match the front-stage and rear-stage circuits.

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