KR102522016B1 - Magnetoresistive Sensor Apparatus for Precise Detection of Door Opening and Closing - Google Patents

Abstract

The present invention relates to a magnetoresistive sensor apparatus for precise detection of door opening and closing. The magnetoresistive sensor apparatus comprises: a permanent magnet (21); a case (22); a first position (23); a second position (24); and a third position (25). According to the present invention, a magnetic field generated from a permanent magnet can be detected more precisely.

Description

Magnetoresistive Sensor Apparatus for Precise Detection of Door Opening and Closing

The present invention relates to a magnetoresistive sensor device for precisely detecting the opening and closing of a door of products such as refrigerators, washing machines, and automobiles. In particular, it relates to a door opening and closing device for home appliances and automobiles based on a magnetoresistive sensor having a higher precision than a conventional Hall sensor.

The opening and closing of doors such as home appliances and automobiles is very essential, and various inventions and prior literature for recognizing the opening and closing of doors based on Hall sensors have been suggested. there is.

As related prior literature, Republic of Korea Patent Registration No. 10-2227388 (published date 2021. 03. 11.) (hereinafter referred to as [Patent Document 1]) proposed a door open/close detection device using a Hall sensor. In [Patent Document 1], a hall sensor element; a magnet corresponding to the Hall sensor element in a spaced state; a pair of magnetic concentrating plates for concentrating the Hall sensor element; A door opening/closing detection device using a Hall sensor characterized by a sensor housing supporting the magnet so as to face has been disclosed.

In addition, Republic of Korea Patent Registration No. 10-2103776 (published date 2020. 04. 23.) (hereinafter referred to as [Patent Document 2]) proposed a door sensing assembly. In the [Patent Document 2], the door detection device; a magnet installed on a surface facing the door detection device; a cable connected to the door detection device; a connector through which the cable is connected to the inside of the housing; The door sensing device includes a case having a space inside, one side being open, and a hole formed on the other side; a plate including a first plate and a second plate; a sensor sensing the magnet; A fixing member including a first fixing member and a second fixing member has been disclosed.

In addition, Korean Patent Publication No. 10-2015-0022030 (published on March 4, 2015) (hereinafter referred to as [Patent Document 3]) proposes a power trunk or power tailgate control device and method using a hall sensor. did In [Patent Document 3], a motor for transmitting and driving power to a power trunk or a power tailgate; a speed sensor for sensing the speed of the motor; The current position and operating speed of the power trunk or power tailgate are calculated using the speed information of the motor sensed by the speed sensor, and the motor is controlled in consideration of the calculated position and operating speed. When the power tailgate is stopped during an opening or closing operation and the speed sensor detects the movement of the power trunk or power tailgate, according to the movement direction of the power trunk or power tailgate A control unit for controlling the motor to perform an opening/closing operation has been disclosed.

However, in [Patent Document 1] to [Patent Document 3], there is a limitation in that they are based on a Hall sensor that is difficult to detect accurately and cannot use a magnetoresistive sensor with excellent precision.

Patent Document 1: Republic of Korea Patent Registration No. 10-2227388 (Announcement date 2021.03.11.) Patent Document 2: Republic of Korea Patent Registration No. 10-2103776 (Announcement date 2020.04.23.) Patent Document 3: Republic of Korea Patent Publication No. 10-2015-0022030 (published on 2015.03.04.)

The present invention is to solve the problems of the prior art, and is not a Hall sensor generally used in detecting the opening and closing of a door, and more accurately detects a magnetic field generated by a permanent magnet. It is to provide a device using a magnetoresistance sensor that can be measured sensitively.

The above object and other additional objects will be clearly recognized by those skilled in the art without departing from the spirit of the present invention by the appended claims.

라면, 길이 방향과 대응되는

정도의 거리에 위치하는 제1 위치(23), 상기 제1 위치(23)에서

정도의 거리에 위치하는 제2 위치(24), 및 상기 제2 위치(24)에서

정도의 거리에 위치하는 제3 위치(25)에서, 상기 자기저항 센서(30)는 제1 위치(23) 또는 제3 위치(25)에 배치하는 것을 특징으로 한다.A magnetoresistive sensor device for precise detection of door opening and closing according to a first aspect of the present invention for solving the above problems includes: a permanent magnet 21 disposed on a door; and a case 22 for arranging a magnetoresistance sensor 30 for detecting a magnetic field of the permanent magnet 21; Including, the length of the permanent magnet 21 in the case 22

Ramen, corresponding to the longitudinal direction

A first location (23) located at a distance of about, at the first location (23)

at a second location 24 located at a distance of about

In the third position 25 located at a distance of about 0, the magnetoresistance sensor 30 is characterized in that it is disposed at the first position 23 or the third position 25.

Preferably, the magnetoresistance sensor is characterized in that a change in magnetoresistance according to a change in magnetic flux exhibits a hysteresis characteristic.

Also preferably, the magnetoresistance sensor is characterized in that it operates at 2.2 to 14 Gauss [Gauss].

More preferably, the general operation of the magnetoresistive sensor is characterized by a magnetic field of about 7 Gauss.

Also preferably, the magnetoresistance sensor is characterized in that it is composed of a first terminal 15, a second terminal 16 and a magnetoresistance detector 17.

라면, 길이 방향과 대응되는

정도의 거리에 위치하는 제1 위치(23)에서, 상기 자기저항 센서(30)는 제1 위치(23)에 배치하는 것을 특징으로 한다.On the other hand, a magnetoresistive sensor device for precise detection of door opening and closing according to a second aspect of the present invention for solving the above problems includes a permanent magnet 21 disposed on the door; and a case 22 for arranging a magnetoresistance sensor 30 for detecting a magnetic field of the permanent magnet 21; Including, the length of the permanent magnet 21 in the case 22

Ramen, corresponding to the longitudinal direction

It is characterized in that the magnetoresistance sensor 30 is disposed at the first position 23 at the first position 23 located at a distance of about 100 degrees.

Preferably, the magnetoresistance sensor device detects a magnetic field at a distance (B) between the permanent magnet 21 disposed on the door and the magnetoresistance sensor 30 at a distance of 14.5 [mm] to 19.5 [mm] characterized by

이며,

인 것을 특징으로 한다.Also preferably, the length of the permanent magnet 21

is,

It is characterized by being

라면, 길이 방향과 대응되는

의 거리에 위치하는 제1 위치에서 가장 동작이 민감하며, 여섯째, 홀(Hall) 센서와 비교하여 자기저항 센서의 경우, 자기장의 검출을 높이기 위해서 철심을 부착시키거나, 자기장이 홀(Hall) 센서에 집중되기 위한 부가적인 자기장 유도 물질을 배치가 불필요하므로 장치의 구조가 더욱 단순하다는 상승된 효과가 발생한다.First, the magnetoresistive sensor device for precise detection of door opening and closing proposed in the present invention is a magnetoresistive sensor that responds more precisely and sensitively to magnetic fields compared to conventional Hall sensors, so the precision of door opening and closing is excellent. . Second, the Hall sensor operates in the range of 25 to 135 Gauss [Gauss], and the magnetic resistance sensor operates in the range of 2.2 to 14 [Gauss], so it detects the magnetic field generated from the permanent magnet more precisely, , Thirdly, it is possible to detect the operation of the slight opening of the door, fourthly, it is possible to prevent the erroneous operation of opening and closing the door, and fifthly, the length of the permanent magnet is

Ramen, corresponding to the longitudinal direction

The operation is most sensitive at the first position located at a distance of, and sixth, compared to the Hall sensor, in the case of the magnetoresistive sensor, an iron core is attached to increase the detection of the magnetic field, or the magnetic field is a Hall sensor Since there is no need to arrange an additional magnetic field inducing material to be concentrated on, a synergistic effect that the structure of the device is simpler occurs.

Meanwhile, additional features and advantages of the present invention will become more clear through the following description.

1 is a conceptual diagram illustrating the operation principle of a Hall sensor.
2 is a conceptual diagram of the operating principle of a magnetoresistive sensor.
3 is an external view of a Hall sensor.
4 is an external view of a magnetoresistive sensor.
5(a) is a photograph of a Hall sensor, and FIG. 5(b) is a photograph of a magnetoresistive sensor.
6 shows electrical characteristics of a Hall sensor.
7 shows operating Gauss characteristics according to temperature in a magnetoresistive sensor.
8 is a proposed magnetoresistive sensor device for precise detection of door opening and closing.
9 is a first embodiment for the arrangement of the proposed case and magnetoresistive sensor.
10 is a second embodiment for the arrangement of the proposed case and magnetoresistive sensor.

The present invention will be described with reference to the accompanying drawings for preferred embodiments.

However, the embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below, and those of ordinary skill in the art can It is provided for complete explanation.

1 is a conceptual diagram illustrating the operation principle of a Hall sensor. In the case of the representative Hall sensor shown in FIG. 1, a cross-shaped (+) Hall sensor detection plate 11 is disposed, and the current flow part of the Hall sensor detection plate in the first direction ( 11-1) is disposed, and the voltage generator 11-2 of the Hall sensor detection plate is disposed in the first direction perpendicular to the first direction. When a change in the magnetic field occurs in the magnetic field area 12 at the center of the cross-shaped (+) Hall sensor detection plate 11, current flows through the current flow part 11-1 of the Hall sensor detection plate. A blur of is generated, and a voltage is generated in the voltage generating unit 11-2 of the Hall sensor detection plate, and a voltage is generated in the Hall voltage generating terminal 13. Above all, (+) and (-) voltages of the Hall voltage generating terminal 13 are generated according to the current direction of the current flow part 11-1 of the Hall sensor detection plate.

Since the Hall sensor operates in the range of 25 to 135 Gauss, the detection accuracy of the magnetic field is relatively insensitive.

2 shows a conceptual diagram of the operation principle of the magnetoresistive sensor, and FIG. 2 (a) shows the structure of the magnetoresistive sensor and the relationship between the magnetic field [Oe] and TMR ( Tunneling Magneto Resistance : Tunnel Magnetoresistance) [%], 2(b) shows the relationship between magnetic field [Oe] and magnetoresistance [Ohm]. The magnetoresistance sensor in FIG. 2 (a) is characterized in that the magnetoresistance detector 17 is disposed between the first terminal 15 and the second terminal 16. Through this, in the magnetoresistance detector 17, the tunnel magnetoresistance (TMR) [%] is changed as a hysteresis curve according to the variation of the magnetic field [Oe], and thus the magnetoresistance [Ohm] is changed according to the magnetic field [Oe]. Characterized in that it changes to a hysteresis curve. Through this, it is a technical feature that the detection precision of the magnetic field can be detected very sensitively.

Figure 3 shows the Hall (Hall) sensor outline and main dimensions. In FIG. 3, the main dimension uses a unit of mm, and the Hall sensor has a size of 4.1 [mm] × 3.1 [mm] and a thickness of 0.557 [mm].

4 shows an external view and main dimensions of a magnetoresistive sensor. In FIG. 4, the main dimension uses a mm unit, and the magnetoresistive sensor has a size of 4.0 [mm] × 3.0 [mm] and a thickness of 0.5 [mm].

5(a) is a photograph of a Hall sensor, and FIG. 5(b) shows a photograph of a magnetoresistive sensor. Hall sensors and magnetoresistive sensors are very similar in size and shape.

6 shows electrical characteristics of a Hall sensor. The operating voltage is in the range of 2.5 [V] to 26 [V], the general operating range of the magnetic field is 20 to 40 Gauss [Gauss], and the magnetic field range in which the operation starts (Release) in the Hall sensor is At least 11 Gauss.

7 shows operating Gauss characteristics according to temperature in a magnetoresistive sensor. The general operation (Operate) of the magnetic field is 7 to 7.5 Gauss [Gauss], and the range of the magnetic field in which the operation starts (Release) in the magnetoresistive sensor is at least 2 Gauss [Gauss].

8 shows the proposed magnetoresistive sensor device for precise detection of door opening and closing, and a comparison of magnetic field operating ranges of a Hall sensor and a magnetoresistive sensor is as follows.

(1) Hall sensor

- Magnetic Field Operate Range: 20 to 40 Gauss [Gauss]

- Magnetic field range where motion starts (release): Minimum 11 Gauss [Gauss]

(2) Magnetoresistive sensor

- Magnetic Field Operate Range: 7 to 7.5 Gauss [Gauss]

- Magnetic field range where motion starts (Release): Minimum 2 Gauss [Gauss]

Therefore, in the case of the Hall sensor, since the detection accuracy of the magnetic field is relatively insensitive, it is better to attach an iron core to increase the detection of the magnetic field or to place an additional magnetic field inducing material to concentrate the magnetic field on the Hall sensor. Common.

라면, 길이 방향과 대응되는

의 거리(중앙)에 배치시키는 방식이 아니라 상기 영구자석(21)의 길이가

라면, 길이 방향과 대응되는

의 거리에 배치시키는 것을 가장 큰 기술적 특징으로 한다.However, in the case of a magnetoresistive sensor, the detection precision of a magnetic field is very excellent, and there are characteristics of detecting a magnetic field very precisely and sensitively. Above all, the length of the permanent magnet 21 is required to detect the magnetic field in the magnetoresistive sensor.

Ramen, corresponding to the longitudinal direction

The length of the permanent magnet 21 is not a method of arranging at a distance (center) of

Ramen, corresponding to the longitudinal direction

Arrangement at a distance of is the biggest technical feature.

라 하고, 길이 방향과 대응되는

거리의 위치를 제1 위치(23), 상기 제1 위치(23)에서

거리의 위치를 제2 위치(24), 및 상기 제2 위치(24)에서

거리의 위치를 제3 위치(25)라 할 때에, 상기 자기저항 센서(30)는 제1 위치(23) 또는 제3 위치(25)에 배치하는 것을 본 발명의 핵심적인 부분으로 한다.That is, the magnetoresistance sensor device for precise detection of door opening and closing includes a case 22 for disposing a permanent magnet 21 disposed on a door and a magnetoresistive sensor 30 for detecting a magnetic field of the permanent magnet 21 Including, the length of the permanent magnet 21 in the case 22

, corresponding to the length direction

The location of the distance to the first location (23), from the first location (23)

the location of the distance at a second location (24), and at the second location (24)

When the position of the distance is referred to as the third position 25, it is a key part of the present invention that the magnetoresistance sensor 30 is disposed at the first position 23 or the third position 25.

라면, 길이 방향과 대응되는

의 거리에 배치시킴을 통하여 자기저항 센서(30)에서 자기장을 민감하게 검출하며 안정적으로 도어 개폐 여부를 검출할 수 있는 것을 기술적 특징으로 한다. 즉, 냉장고의 프레임에 자석이 위치하고 MR 센서가 문짝에 위치할 경우, 포워드 시 (문을 닫을 때) 에 'ON' 을 인식하는 권장 거리는 17 ± 2.5 mm인바, [표 1]에서 보는 바와 같이, 1/4 지점에 MR 센서가 위치 시에는 이를 모두 만족하나, 센터에 위치 시에는 이를 벗어나게 되는바(Not Good), 이는 냉장고의 문짝이 직선 운동이 아닌 힌지에 의해 선회하기 때문이며, 반대로 리버스 시 (문을 열 때) 에 'OFF' 를 인식하는 권장 거리는 20 ± 2.5 mm인바, 역시 1/4 지점에 MR 센서가 위치 시에는 이를 모두 만족하나, 센터에 위치 시에는 이를 벗어나게 되는바, 이는 MR 센서의 고유 잔류자성밀도(히스테리시스 효과) 로 인하여 좀더 냉장고의 문짝이 포워드 보다는 더 멀어져야 '문 열림' 으로 인식하기 때문이며, 이는 센터에 위치할 때에 히스테리시스 효과가 더 크게 작용하기 때문에, 역시 MR 센서가 센터에 위치 시에는 이를 벗어나게 된다(Not Good).
포워드 (문을 닫을 때)* 리버스 (문을 열 때)** MR 센서위치 1/4 지점 센터 1/4 지점 센터 1 17 12 21 27 2 15 11 20 29 3 16 10 22 30 4 18 9 19 26 5 19 13 21 25 비고 OK N.G. OK N.G.
* 포워드(문을 닫을 때) 'ON' 인식 거리 : 17 ± 2.5 mm
** 리버스(문을 열 때) 'OFF' 인식 거리 : 20 ± 2.5 mmIn particular, the arrangement position of the magnetoresistive sensor 30 is a special part, and the length of the permanent magnet 21 is

Ramen, corresponding to the longitudinal direction

It is technically characterized in that it can sensitively detect a magnetic field in the magnetoresistance sensor 30 and stably detect whether the door is opened or closed by placing it at a distance of . That is, when the magnet is located on the frame of the refrigerator and the MR sensor is located on the door, the recommended distance for recognizing 'ON' during forward (when the door is closed) is 17 ± 2.5 mm, as shown in [Table 1], When the MR sensor is located at the 1/4 point, all of these are satisfied, but when it is located at the center, it deviates (Not Good). When the door is opened), the recommended distance for recognizing 'OFF' is 20 ± 2.5 mm. Again, when the MR sensor is located at the 1/4 point, all of these are satisfied, but when it is located at the center, it is out of range. This is because it is recognized as 'door open' when the door of the refrigerator is farther away than forward due to the inherent remanent magnetic density (hysteresis effect) of . When positioned at , it is out of this (Not Good).
Forward (when closing the door)* Reverse (when opening the door)** MR sensor location quarter point center quarter point center One 17 12 21 27 2 15 11 20 29 3 16 10 22 30 4 18 9 19 26 5 19 13 21 25 note OK NG OK NG
* Forward (when closing the door) 'ON' recognition distance: 17 ± 2.5 mm
** Reverse (when opening the door) 'OFF' recognition distance: 20 ± 2.5 mm

9 shows a first embodiment for the arrangement of the proposed case and magnetoresistive sensor, and FIG. 10 shows a second embodiment for the arrangement of the proposed case and magnetoresistive sensor.

라면, 길이 방향과 대응되는

의 거리에 위치하는 제1 위치(23), 상기 제1 위치(23)에서

의 거리에 위치하는 제2 위치(24), 상기 제2 위치(24)에서

의 거리에 위치하는 제3 위치(25)에 상기 자기저항 센서(30)를 배치시킬 수 있다. 무엇보다도, 도 9(b), 도 9(c), 도 10(b) 및 도 10(c)를 참고하면, 무엇보다 제1 위치(23) 또는 제3 위치(25)에 상기 자기저항 센서(30)을 배치시키는 것이 가장 이상적이다.9 and 10 show a case 22 in which the magnetoresistive sensor 30 is disposed, and the length of the permanent magnet 21 is

Ramen, corresponding to the longitudinal direction

A first location 23 located at a distance of, at the first location 23

A second location 24 located at a distance of, at the second location 24

The magneto-resistance sensor 30 may be disposed at a third position 25 located at a distance of . Above all, referring to FIGS. 9(b), 9(c), 10(b) and 10(c), above all, the magnetoresistance sensor is located at the first position 23 or the third position 25 (30) is most ideal.

라면, 그 중앙 부분인 상기 제2 위치(24)보다 상기 영구자석(21)의 길이가

라면, 길이 방향과 대응되는

의 거리인 제1 위치(23) 또는 제3 위치(25)에 배치하는 것이 가장 바람직하며, 본 발명에서 핵심적인 기술적 특징으로 한다.The reason for this is that the magnetoresistive sensor 30 is very sensitive because the magnetic field operating range is 7 to 7.5 Gauss [Gauss] and the magnetic field range at which the operation starts (release) is at least 2 Gauss [Gauss]. Resistance sensor 30 is the length of the permanent magnet 21

, the length of the permanent magnet 21 is greater than the second position 24, which is the central part

Ramen, corresponding to the longitudinal direction

It is most preferable to arrange at the first position 23 or the third position 25, which is a distance of , and is a key technical feature in the present invention.

The magnetoresistance sensor device can stably detect a magnetic field at a distance (B) between the permanent magnet 21 disposed on the door and the magnetoresistance sensor 30 at a distance of 14.5 [mm] to 19.5 [mm]. .

'의 거리인 제1 위치(23) 또는 제3 위치(25)에 배치하는 것을 기술적 특징으로 한다.For this purpose, the preferred size of the permanent magnet 21 is 18 [mm] × 7 [mm] × 5 [mm] for the first type or 18 [mm] × 15 [mm] × 7 [mm] for the second type. do. In particular, the length (A) of the permanent magnet 21 is 18 [mm], '

It is technically characterized by arranging it at the first position 23 or the third position 25, which is a distance of '.

Therefore, the magnetoresistive sensor device for precise detection of door opening and closing proposed in the present invention is a magnetoresistance sensor that responds to a magnetic field more precisely and sensitively than conventional Hall sensors, so the precision of door opening and closing is excellent, Since it is not necessary to attach an iron core to increase the detection of a magnetic field or to place an additional magnetic field inducing material for concentrating a magnetic field on a Hall sensor, the structure of the device is more simple.

In the above, the present invention has been described according to an embodiment of the present invention, but changes and modifications made by those skilled in the art within the scope of the technical spirit of the present invention also belong to the present invention. Of course.

11: Cross (+) Hall sensor detection plate
11-1: Current flow part of Hall sensor detection plate
11-2: Voltage generating part of Hall sensor detection plate
12: magnetic field area
13: Hall voltage generating terminal
15: first terminal
16: second terminal
17: magnetic resistance detection unit
21: permanent magnet
22: case
23: first position
24: second position
25: 3rd position
26: Placement of magnetoresistive sensor
30: magnetoresistive sensor
A: Horizontal length of permanent magnet
B: distance between permanent magnet and reluctance sensor

Claims (8)

In the magnetoresistive sensor device for precise detection of door opening and closing,
a permanent magnet 21 disposed on the door;
a case 22 for arranging a magnetoresistive sensor 30 for detecting a magnetic field of the permanent magnet 21;
The length of the permanent magnet 21 in the case 22

Ramen, corresponding to the longitudinal direction

a first location 23 located at a distance of about 100 degrees;
At the first position 23

a second location 24 located at a distance of about 100 degrees; and
at the second position 24

a third location 25 located at a distance of about 100 degrees;
Including,
The magnetoresistive sensor 30 is disposed at the first position 23 or the third position 25,
The length of the permanent magnet 21 (

) is 18 [mm];
The first position 23 or the third position 25 is at both ends.

is the distance of;
The distance (B) between the permanent magnet 21 disposed on the door and the magnetoresistance sensor 30 is 14.5 [mm] to 19.5 [mm];
The magnetoresistive sensor operates at 2.2 to 14 Gauss,
The magnetoresistive sensor device for precise detection of door opening and closing, characterized in that the magnetoresistance sensor is composed of a first terminal (15), a second terminal (16) and a magnetoresistance detector (17). According to claim 1,
The magnetoresistive sensor device for precise detection of door opening and closing, characterized in that the change in magnetic resistance according to the change in magnetic flux represents a hysteresis characteristic.
delete According to claim 1,
The magnetoresistive sensor device for precise detection of door opening and closing, characterized in that the general operation of the magnetoresistive sensor is a magnetic field of about 7 Gauss. delete delete delete delete

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