TMR sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a TMR sensor, which comprises an upper cover, a lower cover, a PCB (printed circuit board), a TMR chip, PINs and a magnetic core. The magnetic core is of an annular structure, and an opening air gap is formed in the magnetic core. The lower cover is of a containing cavity structure with the top open. The PINs are arranged at the upper end of the PCB and are connected with the PCB; the PCB is arranged in the lower cover, and the magnetic core is arranged in the lower cover; the TMR chip is installed on the PCB, and the TMR chip is located in the opening air gap of the magnetic core. The upper cover is fixed at the upper end of the lower cover, a slotted hole is formed in the upper cover, and all pins of the PINs are led out from the slotted hole. According to the TMR sensor, pins of different numbers of PINs can penetrate through the slotted holes formed in the upper cover, the upper cover of the TMR sensor can be universally used for sensors with different numbers of PINs, and the design and processing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a TMR sensor. Background Art

[0002] The TMR sensor is a magnetically sensitive element that uses the tunnel magnetoresistance effect. By changing the external magnetic field, the resistance of the TMR sensor can change. Due to differences in market demand, TMR sensors have different requirements for the number of PIN pins of the product. The top cover of the TMR sensor needs to have the same number of pinholes as the PIN pins, using a one-pin-one-hole design. Depending on market demand, the sensor's top cover structure needs to be redesigned for different numbers of PIN pins, which increases R&D and manufacturing costs.

[0003] On the other hand, the existing TMR sensor adopts a double-layer embedded tight-fit installation structure. The disadvantage of the double-layer tight-fit installation is that the wall thickness is thin, and the shell will be slightly deformed after aging, and there is a situation where the shell is not tight and falls off. Utility Model Content

[0004] The utility model provides a TMR sensor to solve the technical problem that the upper cover structure of the sensor needs to be redesigned when there are different numbers of PIN pins in the prior art, which increases the research and development and manufacturing costs.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A TMR sensor, comprising: an upper cover, a lower cover, a PCB circuit board, a TMR chip, a PIN needle and a magnetic core;

[0007] The magnetic core is configured as a ring structure and an open air gap is provided on the magnetic core; the lower cover is configured as a cavity structure with an open top;

[0008] The PIN pin is arranged at the upper end of the PCB circuit board and connected to the PCB circuit board; the PCB circuit board is arranged inside the lower cover, and the magnetic core is arranged inside the lower cover; the TMR chip is mounted on the PCB circuit board, and the TMR chip is located in the open air gap of the magnetic core;

[0009] The upper cover is fixed to the upper end of the lower cover, and a slot is formed on the upper cover, through which all the pins of the PIN needles are led outward.

[0010] Furthermore: a plurality of evenly distributed card slots are arranged at the inner opening edge of the lower cover; a plurality of card tongues are arranged at the outer edge of the upper cover; and the card tongues are fixed in the card slots by card connection.

[0011] Furthermore: it also includes: a positioning column; the positioning column is fixed on the bottom of the lower cover; the magnetic core is sleeved on the positioning column.

[0012] Furthermore: a plurality of limiting protrusions are arranged at the edge of the inner bottom of the lower cover; the limiting protrusions are used to cooperate with the latch tongues.

[0013] Furthermore: a supporting structure is arranged at the bottom of the inner side of the lower cover, and the magnetic core and the PCB circuit board are arranged on the supporting structure.

[0014] The TMR sensor provided by the utility model has at least the following beneficial effects or advantages:

[0015] The TMR sensor provided by the utility model has a magnetic core arranged in an annular structure and an open air gap arranged on the magnetic core; and a lower cover arranged in a cavity structure with an open top. A PIN pin is arranged at the upper end of a PCB circuit board and connected to the PCB circuit board; the PCB circuit board is arranged inside the lower cover, and the magnetic core is arranged inside the lower cover; a TMR chip is mounted on the PCB circuit board, and the TMR chip is located in the open air gap of the magnetic core. The upper cover is fixed on the lower cover, and a slot is provided on the upper cover, and a pin of at least one PIN pin is led outward from the slot. In the TMR sensor, the slot arranged on the upper cover can pass through the pins of different numbers of PIN pins, and the upper cover can be universal for sensors with different numbers of PIN pins, thereby reducing the design and processing costs.

[0016] On the other hand, the TMR sensor has multiple evenly distributed card slots at the inner opening edge of the lower cover, and multiple card tongues at the outer edge of the upper cover, which are fixed in the card slots. The snap connection makes it easy to install, and the upper cover shell will not fall off as the use time increases; through software and hardware debugging, the product structure is optimized while ensuring the safe creepage distance, and the installation process is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the external structure of a TMR sensor provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure of a TMR sensor provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the internal structure of the lower cover provided by an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the explosion structure of a TMR sensor provided in an embodiment of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1-upper cover, 2-lower cover, 3-PIN needle, 4-magnetic core, 5-PCB circuit board, 6-TMR chip, 7-card slot, 8-limiting protrusion, 9-support structure. DETAILED DESCRIPTION

[0023] The utility model provides a TMR sensor to solve the technical problem that the upper cover structure of the sensor needs to be redesigned when there are different numbers of PIN pins in the prior art, which increases the research and development and manufacturing costs.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4 The embodiment of the utility model provides a TMR sensor, which mainly includes: an upper cover 1, a lower cover 2, a PCB circuit board 5, a TMR chip 6, a PIN needle 3 and a magnetic core 4. The magnetic core 4 is set as a ring structure and an open air gap is set on the magnetic core 4. The lower cover 2 is set as a cavity structure with an open top, and the cavity structure is used to install the internal components of the TMR sensor. The PIN needle 3 is set at the upper end of the PCB circuit board 5 and connected to the PCB circuit board 5. The PCB circuit board 5 is set inside the lower cover 2, and the magnetic core 4 is set inside the lower cover 2; a plurality of support structures 9 of the same height are set at the bottom of the inner side of the lower cover 2, and the magnetic core 4 and the PCB circuit board 5 are set on the support structure 9. The TMR chip 6 is installed on the PCB circuit board 5, and the TMR chip 6 is located in the middle position of the open air gap of the magnetic core 4. The upper cover 1 is fixed above the lower cover 2, and the upper cover 1 is provided with a slot hole that runs through from top to bottom; for example, the slot hole in this embodiment is set as a long strip through hole, and all pins of the PIN needle 3 are led outward from the slot hole. The slots arranged on the upper cover 1 can pass through pins of different numbers of PIN pins 3. For sensors with different numbers of PIN pins, the upper cover 1 can be universal and can be manufactured using the same mold.

[0026] like Figure 1-Figure 4 As shown, in a preferred embodiment provided by the utility model: a plurality of evenly distributed card slots 7 are provided at the inner opening edge of the lower cover 2; a plurality of card tongues are provided at the outer edge of the upper cover 1; the card tongues are fixed in the card slots 7. The upper cover 1 and the lower cover 2 of the TMR sensor are arranged in a snap connection mode, so that it has the advantage of convenient installation, and the upper cover 1 shell will not fall off with the increase of the use time.

[0027] In order to facilitate the installation and positioning of the magnetic core 4, a preferred embodiment provided by the utility model is further provided with: a positioning column; the positioning column is fixed to the bottom of the lower cover 2; and the magnetic core 4 is sleeved on the positioning column.

[0028] In a preferred embodiment provided by the utility model, a plurality of limiting protrusions 8 are provided at the edge of the inner bottom of the lower cover 2; the limiting protrusions 8 are used to cooperate with the latch tongue. The purpose of providing the limiting protrusions 8 is to limit the latch tongue, which can provide a certain support to the upper cover 1 through the latch tongue, and can prevent the latch tongue from excessively invading the lower cover 2 downwards and causing deformation of the upper cover 1 or the lower cover 2.

[0029] like Figure 1-Figure 4 As shown: The TMR sensor provided by the utility model has at least the following beneficial effects or advantages:

[0030] The TMR sensor provided by the embodiment of the utility model has a magnetic core 4 configured as an annular structure and an open air gap on the magnetic core 4; the lower cover 2 is configured as a cavity structure with an open top. The PIN pin 3 is arranged at the upper end of the PCB circuit board 5 and connected to the PCB circuit board 5; the PCB circuit board 5 is arranged inside the lower cover 2, and the magnetic core 4 is arranged inside the lower cover 2; the TMR chip 6 is mounted on the PCB circuit board 5, and the TMR chip 6 is located in the open air gap of the magnetic core 4. The upper cover 1 is fixed on the lower cover 2, and the upper cover 1 is provided with a slot, and the pin of at least one PIN pin 3 is led outward from the slot. In the TMR sensor, the slot provided on the upper cover 1 can pass through the pins of different numbers of PIN pins 3. For sensors with different numbers of PIN pins, the upper cover 1 can be universal, which reduces the design and processing costs.

[0031] The TMR sensor provided by the embodiment of the utility model has a plurality of evenly distributed card slots 7 arranged at the inner opening edge of the lower cover 2, and a plurality of card tongues arranged at the outer edge of the upper cover 1, which are fixed in the card slots 7. Through the snap connection, it has the advantage of convenient installation, and the upper cover 1 shell will not fall off with the increase of the use time; through the debugging of software and hardware, the product structure is optimized while ensuring the safe creepage distance, and the installation process is simplified.

[0032] In the description of the present utility model, it should be noted that the terminology nouns in the various embodiments, such as words indicating directions such as "upper", "lower", "front", "back", "left", "right", etc., are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated according to the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute limitations on the present utility model.

[0033] In the description of the present invention, it should be noted that, 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 or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A TMR sensor, characterized in that: include: Upper cover, lower cover, PCB circuit board, TMR chip, PIN needle and magnetic core; The magnetic core is configured as a ring structure and an open air gap is provided on the magnetic core; the lower cover is configured as a cavity structure with an open top; The PIN pin is arranged at the upper end of the PCB circuit board and connected to the PCB circuit board; the PCB circuit board is arranged inside the lower cover, and the magnetic core is arranged inside the lower cover; the TMR chip is mounted on the PCB circuit board, and the TMR chip is located in the open air gap of the magnetic core; The upper cover is fixed to the upper end of the lower cover, and a slot is formed on the upper cover, through which all the pins of the PIN needles are led outward.

2. The TMR sensor according to claim 1, characterized in that: A plurality of evenly distributed card slots are arranged at the inner opening edge of the lower cover; a plurality of card tongues are arranged at the outer edge of the upper cover; and the card tongues are fixed in the card slots by card connection.

3. The TMR sensor according to claim 2, characterized in that: Also includes: A positioning column; the positioning column is fixed at the bottom of the lower cover; and the magnetic core is sleeved on the positioning column.

4. The TMR sensor according to claim 2, characterized in that: A plurality of limiting protrusions are arranged at the edge of the inner bottom of the lower cover; the limiting protrusions are used to cooperate with the latch tongues.

5. The TMR sensor according to claim 1, characterized in that: A supporting structure is arranged at the bottom of the inner side of the lower cover, and the magnetic core and the PCB circuit board are arranged on the supporting structure.

Images