TMR sensor

Abstract

The utility model discloses a TMR sensor, and belongs to the technical field of current induction monitoring. When an upper shell assembly and a lower shell assembly are normally buckled, a first elastic needle elastically extrudes a first contact pin, the first contact pin applies pressure to a pressure sensor, the pressure sensor obtains a resistance value (calibration value), the resistance value is transmitted to a circuit main board, and the circuit main board is connected with the circuit main board. And the distance for reflecting the air gap is normal. If a gap is formed between the first bouncing needle and the first contact pin, the first bouncing needle cannot extrude the first contact pin, the first contact pin cannot apply certain pressure to the pressure sensor, and if the difference between the actual resistance value generated by the pressure sensor and the calibration value is large, it can be judged that the gap is large; therefore, the problem of the detection accuracy of the TMR sensor can be reflected.

Description

Technical Field

[0001] The utility model belongs to the technical field of current induction monitoring, and particularly relates to a TMR sensor. Background Technique

[0002] Traditional current transformers usually have iron cores. By transforming the large current on the primary side into a small current on the secondary side, and then passing through the I / V conversion circuit to the ADC for sampling. However, the iron cores of traditional transformers are prone to saturation, and the functions of the transformers are single, only having a simple current acquisition function.

[0003] In the prior art, the Chinese patent publication number is CN 113009205 A, which discloses an Internet of Things intelligent current temperature sensor. The sensor takes power from the cable through an energy-taking coil, then provides electrical energy for the sensor, and detects or monitors current and voltage when the cable passes through the sensor through a Rogowski coil. The sensor based on the Rogowski coil can only monitor the direct current generated by the cable.

[0004] Although the TMR sensor can detect alternating current and direct current, there is an air gap in the TMR sensor, and the size of the air gap is relatively fixed. The air gap can reflect the detection accuracy of the TMR sensor. As the TMR sensor is used for a long time, the structure of the TMR sensor will age, resulting in the increase of the air gap, but the user cannot intuitively find the change of the air gap. Summary of the Invention

[0005] The purpose of the utility model is to provide a TMR sensor to solve the problem that the existing TMR sensor cannot intuitively monitor the change of the air gap.

[0006] The technical solution to achieve the above purpose includes the following:

[0007] A TMR sensor, comprising: an upper shell assembly, a lower shell assembly, a monitoring assembly, and an induction detection assembly. The first end of the upper shell assembly is rotatably connected to the first end of the lower shell assembly, and the second end of the upper shell assembly is snap-connected to the second end of the lower shell assembly; there is a through groove between the upper shell assembly and the lower shell assembly;

[0008] The induction detection assembly includes a first magnetic ring, a second magnetic ring, and a current monitoring chip. The first magnetic ring is installed on the upper shell assembly, the second magnetic ring is installed on the lower shell assembly, there is an air gap between the two ends of the first magnetic ring and the two ends of the second magnetic ring, and the current monitoring chip is arranged at the air gap;

[0009] The monitoring component includes a first spring pin, a first pin, and a circuit main board. The current monitoring chip is electrically connected to the circuit main board. The circuit main board is provided with a pressure sensor. The circuit main board is installed in the lower shell component. The first end of the first pin is in contact with the pressure sensor on the circuit main board. The first spring pin is installed at the first end or the second end of the upper shell component, and the first spring pin corresponds to the second end of the first pin.

[0010] In one embodiment, the monitoring component further includes a second spring pin and a second pin. The first pin and the second pin are respectively installed at both ends of the circuit main board. The first spring pin is installed at the second end of the upper shell component. The second spring pin is installed at the first end of the upper shell component. The first spring pin corresponds to the first pin, and the second spring pin corresponds to the first end of the second pin. The second end of the second pin is in contact with the pressure sensor on the circuit main board.

[0011] In one embodiment, the first end and the second end of the upper shell component are spaced apart.

[0012] In one embodiment, the monitoring component further has a temperature sensing element. The first end of the temperature sensing element is installed on the circuit main board, and the second end of the temperature sensing element is arranged in the through groove.

[0013] In one embodiment, the induction detection component further includes a third magnetic ring, a fourth magnetic ring, a power taking coil, and a battery. The fourth magnetic ring is installed in the lower shell component, and the third magnetic ring is installed in the upper shell component;

[0014] Both ends of the third magnetic ring are in contact with both ends of the fourth magnetic ring and form an annular structure. A through groove is formed inside the annular structure. The power taking coil is wound around the annular structure. The power taking coil is electrically connected to the first end of the battery, and the second end of the battery is electrically connected to the circuit main board.

[0015] In one embodiment, the upper shell component includes a first shell, a second shell, and a pin shaft. The first shell is installed on the second shell and forms a first installation cavity. Both the first magnetic ring and the third magnetic ring are arranged in the first installation cavity. Both ends of the third magnetic ring are arranged on the outer surface of the second shell;

[0016] The lower shell component includes a third shell, a fourth shell, and a fifth shell. The fourth shell is installed on the fifth shell. The third shell is sleeved outside the fourth shell. A second installation cavity is formed between the third shell and the fifth shell. Both the second magnetic ring and the fourth magnetic ring are arranged in the second installation cavity. Both ends of the fourth magnetic ring are arranged on the outer surface of the third shell.

[0017] In one embodiment, the upper shell assembly further has a first elastic member. The first elastic member is disposed between the top of the third magnetic ring and the inner wall of the first housing. The third magnetic ring abuts against the inner wall of the first housing through the first elastic member, and both ends of the third magnetic ring are in contact with both ends of the fourth magnetic ring.

[0018] In one embodiment, the upper shell assembly further has a second elastic member. The second elastic member is disposed between the bottom of the third magnetic ring and the inner wall of the second housing. The third magnetic ring abuts against the inner wall of the second housing through the second elastic member.

[0019] In one embodiment, the upper shell assembly further has a pressing block and a third elastic member. The pressing block has a mounting groove, and the third elastic member is mounted in the mounting groove;

[0020] The second housing has an opening for the first end of the pressing block to pass through. The pressing block is slidably engaged with the second housing, and the second end of the pressing block abuts against the second housing;

[0021] Both ends of the third elastic member abut against the pressing block and the inner wall of the first housing respectively, and at least a part of the pressing block is located in the receiving groove.

[0022] In one embodiment, the induction detection assembly further has a copper foil sheet and an induction FPC board. The copper foil sheet is mounted in the upper shell assembly and disposed below the first magnetic ring; the induction FPC board is mounted in the lower shell assembly and disposed above the second magnetic ring; the current monitoring chip is mounted on the induction FPC board, and the induction FPC board is electrically connected to the circuit main board. Both the copper foil sheet and the induction FPC board are arc-shaped, and the inner arc surfaces of the copper foil sheet and the induction FPC board face the through groove.

[0023] The technical solution provided by the present utility model has the following advantages and effects:

[0024] When the upper shell assembly and the lower shell assembly are properly buckled, the first spring pin elastically presses the first pin. The first pin applies pressure to the pressure sensor, and the pressure sensor obtains a resistance value (calibration value). This resistance value is transmitted to the circuit main board to indicate that the distance of the air gap is normal. If there is a gap between the first spring pin and the first pin, the first spring pin cannot press the first pin, and the first pin cannot apply a certain pressure to the pressure sensor. The actual resistance value generated by this pressure sensor is quite different from the calibration value, so it can be judged that the air gap is large, and thus it can be reflected that there is a problem with the detection accuracy of the TMR sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein show specific examples of the technical solutions of the present utility model and form a part of the description of the specific embodiments, and are used to explain the technical solutions, principles and effects of the present utility model.

[0026] Unless otherwise specified or defined, in different drawings, the same reference numerals represent the same or similar technical features. For the same or similar technical features, different reference numerals may also be used for representation.

[0027] Figure 1 is a schematic diagram of the state of the TMR sensor in an embodiment of the present utility model Figure 1 ;

[0028] Figure 2 is a schematic diagram of the state of the TMR sensor in an embodiment of the present utility model Figure 2 ;

[0029] Figure 3 is a schematic diagram of the state of the TMR sensor in an embodiment of the present utility model Figure 3 ;

[0030] Figure 4 is an exploded view of the TMR sensor in an embodiment of the present utility model;

[0031] Figure 5 is a top view of the TMR sensor in an embodiment of the present utility model;

[0032] Figure 6 is in an embodiment of the present utility model Figure 5 A - A cross-sectional view;

[0033] Figure 7 is in an embodiment of the present utility model Figure 5 B - B cross-sectional view;

[0034] Figure 8 is in an embodiment of the present utility model Figure 5 C - C cross-sectional view;

[0035] Description of reference numerals:

[0036] 100, TMR sensor;

[0037] 1, upper housing assembly; 11, first housing; 12, pressing block; 121, mounting groove; 13, third elastic member; 14, second housing; 15, pin shaft; 16, first mounting cavity;

[0038] 2, lower housing assembly; 21, third housing; 22, fourth housing; 23, fifth housing; 24, induction FPC board; 25, temperature sensing element; 26, support plate; 27, second mounting cavity;

[0039] 3, ground wire clamp;

[0040] 4, through groove;

[0041] 5. Monitoring component; 51. First spring pin; 52. Second spring pin; 53. First insertion pin; 54. Second insertion pin; 55. Circuit main board; 551. Pressure sensor;

[0042] 6. Inductive detection component; 61. First magnetic ring; 62. Second magnetic ring; 63. First elastic member; 64. Second elastic member; 65. Copper foil sheet; 66. Third magnetic ring; 67. Fourth magnetic ring; 68. Power-taking coil; 69. Air gap;

[0043] 7. Cable. Detailed implementation manners

[0044] For the convenience of understanding the present utility model, the specific embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings of the specification.

[0045] Unless otherwise specified or defined, the "first, second..." used herein is only for differentiating names and does not represent a specific quantity or order.

[0046] Unless otherwise specified or defined, the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] It should be noted that when an element is considered to be "fixed to" another element, it can be directly fixed to the other element or there can be an intermediate element; when an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element at the same time; when an element is considered to be "mounted on" another element, it can be directly mounted on the other element or there can be an intermediate element at the same time. When an element is considered to be "provided in" another element, it can be directly provided in the other element or there can be an intermediate element at the same time.

[0048] The present utility model provides a TMR sensor 100, as Figures 1 to 8As shown in the figure, it includes: an upper shell assembly 1, a lower shell assembly 2, a monitoring assembly 5, and an induction detection assembly 6. The first end of the upper shell assembly 1 is rotatably connected to the first end of the lower shell assembly 2, and the second end of the upper shell assembly 1 is snap-connected to the second end of the lower shell assembly 2; there is a through groove 4 between the upper shell assembly 1 and the lower shell assembly 2; the induction detection assembly 6 includes a first magnetic ring 61, a second magnetic ring 62, and a current monitoring chip. The first magnetic ring 61 is installed on the upper shell assembly 1, the second magnetic ring 62 is installed on the lower shell assembly 2, there is an air gap 69 between the two ends of the first magnetic ring 61 and the two ends of the second magnetic ring 62, and the current monitoring chip is arranged at the air gap 69; the monitoring assembly 5 includes a first spring pin 51, a first pin 53, and a circuit main board 55. The current monitoring chip is electrically connected to the circuit main board 55. There is a pressure sensor 551 on the circuit main board 55. The circuit main board 55 is installed inside the lower shell assembly 2. The first end of the first pin 53 is in contact with the pressure sensor 551 on the circuit main board 55. The first spring pin 51 is installed at the first end or the second end of the upper shell assembly 1, and the first spring pin 51 corresponds to the second end of the first pin 53.

[0049] Specifically, when using the TMR sensor 100 to monitor the current and voltage of the cable 7, open the second ends of the upper shell assembly 1 and the lower shell assembly 2. The first end of the upper shell assembly 1 is rotationally mated with the first end of the lower shell assembly 2. Place the cable 7 on the lower shell assembly 2, and then snap the second ends of the upper shell assembly 1 and the lower shell assembly 2 together. At least part of the cable 7 is located in the through groove 4, improving the problem that the closed-loop structure of the existing Rogowski coil is not convenient for installation. There is an air gap 69 between the first magnetic ring 61 and the second magnetic ring 62, enabling the induction detection assembly 6 to form a tunneling magnetoresistance effect. By changing the external magnetic field, the resistance of the TMR sensor 100 can be changed. When current passes through the cable 7, a magnetic field will be generated around the cable 7, and the magnitude of the magnetic field is proportional to the magnitude of the current in the cable 7. Therefore, by measuring the magnitude of the magnetic field with the TMR magnetic field sensor 100, the magnitude of the current in the cable 7 can be indirectly measured. The sensing unit still adopts a push-pull type Wheatstone bridge structure, and the peak-to-peak value of the output signal can reach 80% of the working voltage, realizing the measurement of electrical parameters such as the actual voltage, current, fault recording, and harmonics of the cable 7.

[0050] The principle of tunnel magnetoresistance is as follows: When a circular magnetic ring is energized, the current is exactly the one that saturates the magnetic core. The fact that it is exactly saturated indicates that all the magnetic domains inside have been arranged in an orderly manner. At this time, a air gap 69 is opened on the magnetic ring to remove a part of the magnetic core, and then this part of the magnetic domains is removed. The magnetic domains originally at the air gap 69 were arranged in an orderly manner, which is equivalent to a small magnet, so there is a positive acting force on the orderly arrangement of the magnetic domains next to the air gap 69. Now that it is removed, the acting force disappears. The magnetic domains next to the air gap 69 were originally just able to be all arranged in an orderly manner. Now, the positive acting force they receive becomes smaller, so they cannot all be arranged in an orderly manner, and the magnetism becomes smaller. This further causes the acting force on the magnetic domains next to the air gap 69 to also become smaller, and they are not all arranged in an orderly manner either. In this way, one after another, more magnetic domains in the entire magnetic core are not arranged in an orderly manner. Therefore, this magnetic ring with the air gap 69 opened is not magnetically saturated. The core mechanism of tunnel magnetoresistance lies in that when the magnetization directions of two ferromagnetic layers are parallel, the probability of electrons tunneling from one magnetic layer to another is relatively large, showing a low-resistance state; when the magnetization directions are anti-parallel, the tunneling probability decreases, showing a high-resistance state.

[0051] The presence of the air gap 69 in the inductive detection component 6 indeed increases the magnetic resistance, which is beneficial. The function of the air gap 69 is to reduce the magnetic permeability, so that the first magnetic ring 61 and the second magnetic ring 62 rely less on the initial magnetic permeability of the magnetic core material. The air gap 69 can avoid magnetic saturation under large AC signals or DC biases and better control the inductance. However, since the air gap 69 is related to the magnetic permeability, the air gap 69 needs to be appropriately compromised and should not be too large or too small. If the air gap 69 is too large, the detection accuracy of the inductive detection component 6 will decrease. When the upper shell component 1 is fastened to the lower shell component 2, the size of the air gap 69 between the first magnetic ring 61 and the second magnetic ring 62 is the designed standard value. However, as the TMR sensor 100 is used for a long time, when the upper shell component 1 and the lower shell component 2 are fastened and locked loose, the clearance between the pin shaft 15 is greater than the fastening clearance, or the device is deformed by external force extrusion, or the material is aged and deformed due to irresistible physical factors, the air gap 69 deviates from the designed standard value, its precise detection degree decreases, and some may even fail. Therefore, it is necessary to monitor the size of the air gap 69. By making the first spring pin 51 correspond to the first end of the first insertion pin 53, and the second end of the first insertion pin 53 contacts the pressure sensor 551. When the upper shell component 1 and the lower shell component 2 are fastened normally, the first spring pin 51 elastically presses the first insertion pin 53, and the first insertion pin 53 applies pressure to the pressure sensor 551. The pressure sensor 551 obtains a resistance value (calibration value), and this resistance value is transmitted to the circuit main board 55 to indicate that the distance of the air gap 69 is normal. If there is a gap between the first spring pin 51 and the first insertion pin 53, the first spring pin 51 cannot press the first insertion pin 53, and the first insertion pin 53 cannot apply a certain pressure to the pressure sensor 551. If the actual resistance value generated by this pressure sensor 551 has a large difference from the calibration value, it can be judged that the air gap 69 is large, and thus it can be reflected that there is a problem with the detection accuracy of the TMR sensor 100.

[0052] In addition, there is a current monitoring chip (not shown in the figure) on the inductive FPC board 24. The current monitoring chip is arranged at the air gap 69. The current monitoring chip is used to sense the current signal between the first magnetic ring 61 and the second magnetic ring 62 and transmit this current signal to the inductive FPC board 24. The current signal is transmitted to the circuit main board 55 through the inductive FPC board 24, so that the circuit main board 55 can monitor electrical parameters such as the voltage, current, fault recording wave, and harmonic of the cable 7.

[0053] In addition, the tunneling magnetoresistance (TMR) effect can detect direct current, mainly because the working principle of the tunneling magnetoresistance sensor is based on the tunneling effect and the change of magnetoresistance. When current passes through the tunneling magnetoresistance sensor, the tunneling effect causes a change in resistance. In the absence of an external magnetic field, electrons are equally distributed in two spin directions, keeping the resistance at an average value. When an external magnetic field acts on the tunneling magnetoresistance sensor, the magnetic field changes the spin direction of the electrons. Depending on the direction of the applied external magnetic field, the spin of the electrons may be the same as or opposite to the spin of the tunneling layer. These spin states in different directions cause a change in resistance. Specifically, when the direction of the applied external magnetic field is consistent with the spin direction of the tunneling layer, the resistance decreases; conversely, when the direction of the applied external magnetic field is opposite to the spin direction of the tunneling layer, the resistance increases. This magnetic-field-induced change in resistance is called the tunneling magnetoresistance effect. Therefore, the tunneling magnetoresistance sensor can detect the change of direct current or other currents by detecting the change of the external magnetic field, convert it into a measurable resistance change signal, and thus achieve the detection and monitoring of current.

[0054] In some embodiments, such as Figures 4 to 8 , the monitoring component 5 further includes a second spring pin 52 and a second insertion pin 54. The first insertion pin 53 and the second insertion pin 54 are respectively installed at both ends of the circuit main board 55. The first spring pin 51 is installed at the second end of the upper shell component 1, and the second spring pin 52 is installed at the first end of the upper shell component 1. The first spring pin 51 corresponds to the first insertion pin 53, and the second spring pin 52 corresponds to the first end of the second insertion pin 54. The second end of the second insertion pin 54 is in contact with the pressure sensor 551 on the circuit main board 55. Specifically, installing the first spring pin 51 at the second end of the upper shell component 1 and the second spring pin 52 at the first end of the upper shell component 1 can be understood as installing the first spring pin 51 at the fastening end between the upper shell component 1 and the lower shell component 2, and installing the second spring pin 52 at the rotating end between the upper shell component 1 and the lower shell component 2. Under normal circumstances, the pressure exerted by the second spring pin 52 at the rotating end on the second insertion pin 54 can better reflect the gap size between the first magnetic ring 61 and the second magnetic ring 62. However, when the upper shell component 1 and the lower shell component 2 are fastened, the combination of the first spring pin 51 and the first insertion pin 53, as well as the second spring pin 52 and the second insertion pin 54, can be used to judge the air gap 69 size at both ends of the first magnetic ring 61 and the second magnetic ring 62.

[0055] Furthermore, such as Figures 6 to 8As shown, there are various contact states between the first spring pin 51 and the first insertion pin 53, and between the second spring pin 52 and the second insertion pin 54. For example, (1) there is contact between the first spring pin 51 and the first insertion pin 53, and no contact between the second spring pin 52 and the second insertion pin 54; there is no contact between the first spring pin 51 and the first insertion pin 53, and there is contact between the second spring pin 52 and the second insertion pin 54. It can be judged whether the sizes of the two air gaps 69 between the two ends of the first magnetic ring 61 and the second magnetic ring 62 are within the calibrated values. For example, (2) there is contact between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54; it can indicate that the sizes of the two air gaps 69 between the two ends of the first magnetic ring 61 and the second magnetic ring 62 are both within the calibrated values. For example, (3) there is no contact between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54; it can indicate that the sizes of the two air gaps 69 between the two ends of the first magnetic ring 61 and the second magnetic ring 62 are not within the calibrated values.

[0056] The foregoing specific method for determining whether the size of the air gap 69 is within the qualified range is as follows: Whether there is contact between the first spring pin 51 and the first insertion pin 53 and no contact in the other group, or there is no contact between the first spring pin 51 and the first insertion pin 53 and there is contact in the other group; according to the actual error size requirement of the specific cable 6 to be detected, in the foregoing contact state, the contact resistance values between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54 are related to the spring pin pressing force. That is, if there is contact between the first spring pin 51 and the first insertion pin 53 and the pressing force of this contact is large, but there is no contact between the second spring pin 52 and the second insertion pin 54, a total resistance value will be obtained. According to the obtained specific resistance value, it is determined whether the air gap 69 is qualified. If the resistance value is still within the actual error size range of the cable 6 to be detected, the air gap 69 is qualified, otherwise it is unqualified.

[0057] When the contact resistance values between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54 change in different contact states, two pressure sensors 551 on the circuit main board 55 will collect analog or digital quantities when the two groups of spring pins and insertion pins are in contact for intelligent analysis and identification, output the contact state quantities of the two groups of spring pins and insertion pins for comparison and analysis with the calibrated quantities. When the comparison between the output contact state quantities of the two groups of spring pins and insertion pins and the calibrated quantities exceeds the preset range, the TMR sensor 100 will send a fault warning message and can send the status and data information of the TMR sensor 100 to the externally connected external supporting equipment.

[0058] Preferably, as Figures 6 to 8As shown, the first end and the second end of the upper shell assembly 1 are set far apart. The first end and the second end of the upper shell assembly 1 are set far apart, so that the positions between the first spring pin 51 and the second spring pin 52 are far away. The first spring pin 51 corresponds to the first insertion pin 53, and the second spring pin 52 corresponds to the second insertion pin 54. The upper shell assembly 1 rotates around the pin shaft 15, making it have a circular movement path. In the radial direction of the rotation path of the upper shell assembly 1, the movement path of the second end of the upper shell assembly 1 is greater than that of its first end. Therefore, a gap often appears earlier between the first spring pin 51 and the first insertion pin 53 than between the second spring pin 52 and the second insertion pin 54; the sizes of the two air gaps 69 between the two ends of the first magnetic ring 61 and the second magnetic ring 62 can be respectively detected by the first spring pin 51 and the first insertion pin 53, and the second spring pin 52 and the second insertion pin 54.

[0059] In some embodiments, such as Figure 4 and Figure 6 As shown, the monitoring assembly 5 further has a temperature sensing element 25. The first end of the temperature sensing element 25 is mounted on the circuit main board 55, and the second end of the temperature sensing element 25 is arranged in the through groove 4. Specifically, the temperature sensor 25 is used to detect the temperature of the cable 7 in the through groove 4. When the temperature of the cable 7 exceeds the calibrated value, the status information can be transmitted to the circuit main board 55, and the TMR sensor 100 will send out a fault warning message.

[0060] In some embodiments, such as Figure 3 and Figure 4As shown in the figure, the inductive detection component 6 further includes a third magnetic ring 66, a fourth magnetic ring 67, a power-taking coil 68, and a battery. The battery is installed in the lower housing component 2 (not shown in the figure). The fourth magnetic ring 67 is installed in the lower housing component 2, and the third magnetic ring 66 is installed in the upper housing component 1. The two ends of the third magnetic ring 66 are in contact with the two ends of the fourth magnetic ring 67 to form an annular structure. A through groove 4 is formed inside the annular structure. The power-taking coil 68 is wound around the annular structure. The power-taking coil 68 is electrically connected to the first end of the battery, and the second end of the battery is electrically connected to the circuit main board 55. Specifically, when a cable 7 is placed in the through groove 4 of the TMR sensor 100, the two ends of the third magnetic ring 66 are in contact with the two ends of the fourth magnetic ring 67 to form an annular structure. The annular structure is provided with a power-taking coil 68. The power-taking coil 68 is used to transmit electric energy to the battery by using the electromagnetic induction phenomenon of the annular structure, so as to realize charging. When the cable 7 is energized, an alternating current will be generated, thereby generating an alternating magnetic field around. The third magnetic ring 66 and the fourth magnetic ring 67 are used to enhance the alternating magnetic field. When the power-taking coil 68 is placed near the annular structure, it senses the magnetic field generated by the annular structure and generates an alternating current. This current is converted into a direct current through a rectifier and then stored in the battery of the device, thus completing the charging. The battery is electrically connected to the circuit main board 55, which can activate the TMR sensor 100 to work and store the excess electric energy in the battery through intelligent energy storage technology to ensure the continuous and stable operation of the TMR sensor 100. When the current in the circuit is less than the starting current or the circuit is in a power-off state, the TMR sensor 100 is powered by the battery to maintain normal operation.

[0061] In addition, in order to improve the stability of the contact between the third magnetic ring 66 and the fourth magnetic ring 67, for example, to detect whether there is a gap between the two ends of the annular structure; after the upper housing component 1 and the lower housing component 2 are buckled, the contact state without a gap between the two ends of the annular structure can be judged by various contact states between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54.

[0062] For example, (1) there is contact between the first spring pin 51 and the first insertion pin 53, and there is no contact between the second spring pin 52 and the second insertion pin 54; there is no contact between the first spring pin 51 and the first insertion pin 53, and there is contact between the second spring pin 52 and the second insertion pin 54; it can indicate that one of the two ends of the annular structure has a gap.

[0063] For example, (2) there is contact between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54; it can indicate that there is no gap between the two ends of the annular structure.

[0064] For example, (3) there is no contact between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54; it can indicate that there are gaps between the two ends of the annular structure.

[0065] When the contact resistance values between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54 in different contact states are related to the magnitude of the spring pin pressing force, two pressure sensors 551 on the circuit main board 55 will collect analog or digital quantities when the two groups of spring pins are in contact with the insertion pins for intelligent analysis and identification, output the contact state quantities and calibration quantities of the two groups of spring pins in contact with the insertion pins for comparative analysis, and the identification is passed when the ring structure is closed without gaps, and there are gaps in the ring structure beyond the calibration range. Therefore, by having multiple contact states between the first spring pin 51 and the first insertion pin 53 and between the second spring pin 52 and the second insertion pin 54, the connection stability between the two ends of the ring structure can be judged, and whether the size of the air gap 69 between the first magnetic ring 61 and the second magnetic ring 62 is within the calibration range can be determined.

[0066] In addition, the multifunctional TMR sensor 100 also has a ground wire clip 3. The first end of the ground wire clip 3 is electrically connected to the circuit main board 55, and the second end of the ground wire clip 3 is used to be electrically connected to the ground wire. The ground wire clip 3 is a ground wire structure.

[0067] Preferably, as Figure 4 shown, the upper shell assembly 1 includes a first shell 11, a second shell 14, and a pin shaft 15. The first shell 11 is installed on the second shell 14 and forms a first installation cavity 16. Both the first magnetic ring 61 and the third magnetic ring 66 are arranged in the first installation cavity 16, and both ends of the third magnetic ring 66 are arranged on the outer surface of the second shell 14; the lower shell assembly 2 includes a third shell 21, a fourth shell 22, and a fifth shell 23. The fourth shell 22 is installed on the fifth shell 23, and the third shell 21 is sleeved outside the fourth shell 22. A second installation cavity 27 is formed between the third shell 21 and the fifth shell 23. Both the second magnetic ring 62 and the fourth magnetic ring 67 are arranged in the second installation cavity 27, and both ends of the fourth magnetic ring 67 are arranged on the outer surface of the third shell 21. Specifically, the first shell 11 and the second shell 14 are assembled by screws to form the upper shell assembly 1, and the third shell 21, the fourth shell 22, and the fifth shell 23 are assembled by screws to form the lower shell assembly 2; the lower shell assembly 2 has pin holes, and both ends of the pin shaft 15 are installed in the pin holes, and the upper shell assembly 1 is rotationally connected to the lower shell assembly 2 through the pin shaft 15.

[0068] In addition, the lower shell assembly 2 also has a support plate 26. There are two grooves on this support plate 26, and the two grooves are respectively used to place the second magnetic ring 62 and the fourth magnetic ring 67 to improve the stability of the second magnetic ring 62 and the fourth magnetic ring 67 in the lower shell assembly 2.

[0069] In some embodiments, as Figure 4 and Figure 8As shown, the upper shell assembly 1 further has a first elastic member 63 disposed between the top of the third magnetic ring 66 and the inner wall of the first housing 11. The third magnetic ring 66 abuts against the inner wall of the first housing 11 through the first elastic member 63, and both ends of the third magnetic ring 66 are in contact with both ends of the fourth magnetic ring 67. The upper shell assembly 1 further has a second elastic member 64 disposed between the bottom of the third magnetic ring 66 and the inner wall of the second housing 14. The third magnetic ring 66 abuts against the inner wall of the second housing 14 through the second elastic member 64. Specifically, by providing the first elastic member 63 and the second elastic member 64, the upper and lower ends of the third magnetic ring 66 are elastically connected to the inner walls of the first housing 11 and the second housing 14 respectively, so that both ends of the third magnetic ring 66 are in elastic contact with both ends of the fourth magnetic ring 67. This can avoid the rigid contact between both ends of the third magnetic ring 66 and both ends of the fourth magnetic ring 67, and prevent the existence of a gap between the third magnetic ring 66 and the fourth magnetic ring 67 due to the machining deviation and assembly tolerance of the third magnetic ring 66 and the fourth magnetic ring 67, further improving the contact stability between the third magnetic ring 66 and the fourth magnetic ring 67. If a gap is generated in the ring structure, it will affect the energy extraction efficiency of the ring structure and generate a certain amount of noise.

[0070] In some embodiments, as Figure 4 and Figure 6 shown, the upper shell assembly 1 further has a pressing block 12 and a third elastic member 13. The pressing block 12 has a mounting groove 121, and the third elastic member 13 is mounted in the mounting groove 121. The second housing 14 has an opening for the first end of the pressing block 12 to pass through. The pressing block 12 is slidably engaged with the second housing 14, and the second end of the pressing block 12 abuts against the second housing 14. Both ends of the third elastic member 13 abut against the pressing block 12 and the inner wall of the first housing 11 respectively, and at least a part of the pressing block 12 is located in the receiving groove 121. Specifically, through the cooperation of the pressing block 12 and the third elastic member 13, after the cable 7 is installed in the through groove 4, the pressing block 12 abuts against the cable 7 by the reaction force of the third elastic member 13, improving the stability of the cable 7 in the through groove 4.

[0071] In some embodiments, as Figure 4As shown, the induction detection component 6 further has a copper foil 65, which is installed in the upper shell component 1 and is disposed below the first magnetic ring 61; the induction FPC board 24 is installed in the lower shell component 2 and is disposed above the second magnetic ring 62; both the copper foil 65 and the induction FPC board 24 are arc-shaped, and the inner arc surfaces of the copper foil 65 and the induction FPC board 24 face the through groove 4. Specifically, the copper foil 65 is mainly used to shield the external stray electric field to avoid affecting the accuracy of the current monitoring chip in sensing the current signal between the first magnetic ring 61 and the second magnetic ring 62. And both the copper foil 65 and the induction FPC board 24 are arc-shaped, and the inner arc surfaces of the copper foil 65 and the induction FPC board 24 face the through groove 4, so that the copper foil 65 fits more tightly with the first magnetic ring 61 and the third magnetic ring 66 in the upper shell component 1, and the induction FPC board 24 fits more tightly with the second magnetic ring 62 and the fourth magnetic ring 67 in the lower shell component 2.

[0072] It should be noted that through the cooperation between the first spring pin 51 and the first pin 53 of the TMR sensor 100, when the TMR sensor 100 monitors, the first pin 53 presses the pressure sensor 551 on the circuit main board 55, so that the pressure sensor 551 monitors the size of the air gap 69. In other TMR sensors 100, the method of using the above-mentioned cooperation between the first spring pin 51 and the first pin 53 to realize the pressure sensor 551 monitoring the size of the air gap 69 is within the protection scope of this application.

[0073] When referring to the drawings for explanation, new features that appear are described; in order to avoid repeated reference to the drawings resulting in less concise description, features that have been described clearly will not be cited one by one in the drawings.

[0074] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solutions of the present invention, and to completely describe the technical solutions, purposes and effects of the present invention. The purpose is to make the public understand the disclosed content of the present invention more thoroughly and comprehensively, and it does not limit the protection scope of the present invention.

[0075] The above embodiments are not exhaustive listings based on the present invention. In addition, there may be multiple other implementation manners not listed. Any replacement and improvement made on the basis of not violating the concept of the present invention fall within the protection scope of the present invention.

Claims

1. A TMR sensor, characterized in that, Comprising: An upper shell assembly, a lower shell assembly, a monitoring assembly, and an induction detection assembly. The first end of the upper shell assembly is rotatably connected to the first end of the lower shell assembly, and the second end of the upper shell assembly is snap-connected to the second end of the lower shell assembly; there is a through groove between the upper shell assembly and the lower shell assembly. The induction detection assembly includes a first magnetic ring, a second magnetic ring, and a current monitoring chip. The first magnetic ring is installed on the upper shell assembly, the second magnetic ring is installed on the lower shell assembly, there is an air gap between the two ends of the first magnetic ring and the two ends of the second magnetic ring, and the current monitoring chip is arranged at the air gap. The monitoring assembly includes a first spring pin, a first pin, and a circuit main board. The current monitoring chip is electrically connected to the circuit main board. There is a pressure sensor on the circuit main board. The circuit main board is installed inside the lower shell assembly. The first end of the first pin is in contact with the pressure sensor on the circuit main board. The first spring pin is installed at the first end or the second end of the upper shell assembly, and the first spring pin corresponds to the second end of the first pin.

2. The TMR sensor according to claim 1, wherein The monitoring assembly further includes a second spring pin and a second pin. The first pin and the second pin are respectively installed at both ends of the circuit main board. The first spring pin is installed at the second end of the upper shell assembly, the second spring pin is installed at the first end of the upper shell assembly, the first spring pin corresponds to the first pin, the second spring pin corresponds to the first end of the second pin, and the second end of the second pin is in contact with the pressure sensor on the circuit main board.

3. The TMR sensor according to claim 2, wherein The first end and the second end of the upper shell assembly are spaced apart.

4. The TMR sensor according to claim 1, wherein The monitoring assembly further has a temperature sensing element. The first end of the temperature sensing element is installed on the circuit main board, and the second end of the temperature sensing element is arranged in the through groove.

5. The TMR sensor according to claim 1, wherein The induction detection assembly further includes a third magnetic ring, a fourth magnetic ring, a power taking coil, and a battery. The fourth magnetic ring is installed inside the lower shell assembly, and the third magnetic ring is installed inside the upper shell assembly. The two ends of the third magnetic ring are in contact with the two ends of the fourth magnetic ring and form an annular structure. The through groove is formed inside the annular structure. The power taking coil is wound around the annular structure. The power taking coil is electrically connected to the first end of the battery, and the second end of the battery is electrically connected to the circuit main board.

6. The TMR sensor according to claim 5, wherein, The upper shell assembly includes a first shell, a second shell, and a pin shaft. The first shell is installed on the second shell and forms a first installation cavity. The first magnetic ring and the third magnetic ring are both arranged in the first installation cavity. The two ends of the third magnetic ring are arranged on the outer surface of the second shell. The lower shell assembly includes a third shell, a fourth shell, and a fifth shell. The fourth shell is installed on the fifth shell, the third shell is sleeved outside the fourth shell, and a second installation cavity is formed between the third shell and the fifth shell. The second magnetic ring and the fourth magnetic ring are both arranged in the second installation cavity. The two ends of the fourth magnetic ring are arranged on the outer surface of the third shell.

7. The TMR sensor according to claim 6, characterized in that, The upper shell assembly further has a first elastic member. The first elastic member is arranged between the top of the third magnetic ring and the inner wall of the first shell. The third magnetic ring abuts against the inner wall of the first shell through the first elastic member, and the two ends of the third magnetic ring are in contact with the two ends of the fourth magnetic ring.

8. The TMR sensor according to claim 7, wherein The upper shell assembly further has a second elastic member, which is disposed between the bottom of the third magnetic ring and the inner wall of the second housing, and the third magnetic ring abuts against the inner wall of the second housing through the second elastic member.

9. The TMR sensor according to claim 6, wherein The upper shell assembly further has a pressing block and a third elastic member. The pressing block has a mounting groove, and the third elastic member is mounted in the mounting groove; The second housing has an opening for the first end of the pressing block to pass through. The pressing block is slidably engaged with the second housing, and the second end of the pressing block abuts against the second housing; Both ends of the third elastic member respectively abut against the pressing block and the inner wall of the first housing, and at least a part of the pressing block is located in the receiving groove.

10. The TMR sensor according to any one of claims 1 to 9, characterized in that, The induction detection assembly further has a copper foil and an induction FPC board. The copper foil is installed in the upper shell assembly and disposed below the first magnetic ring; the induction FPC board is installed in the lower shell assembly and disposed above the second magnetic ring; the current monitoring chip is installed on the induction FPC board, and the induction FPC board is electrically connected to the circuit main board. Both the copper foil and the induction FPC board are arc-shaped, and the inner arc surfaces of the copper foil and the induction FPC board face the through groove.

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