KR20090084789A - Tilt sensor using hall device - Google Patents

Abstract

A tilt sensor using a hall device is provided to measure the tilt accurately as output change is minute according to environmental change and use in inferior environment by detecting the change amount of the electric field quantity of a magnetic in a hall device. A tilt sensor using a hall device comprises a magnetic(10), a supporting shaft(11), a bearing(13), a center weight(12), a housing(25), and a hall device. The hall device comprises a substrate, a base(24), a hall electric field detection unit(21), a microprocessor(22), and an interface. A plurality of magnetoelectric devices used as a sensing unit are integrated. The hall electric field detection unit is formed at one side of the substrate. The hall electric field detection unit detects N pole and S pole of the magnetic. The microprocessor is formed at the other side of the substrate. The microprocessor calculates the tilt according to electric field detection signals and outputs the tilt as digital signals. The interface outputs the signal outputted in the microprocessor to an external device. The interface comprises a PWM output terminal and an analog output terminal.

Description

Tilt sensor using hall device

The present invention relates to a tilt sensor using a Hall element, and in particular, a Hall element for detecting a change in the electric field of the magnetic field and a magnetic field, which detects the amount of change in the magnetic field, and thus detects the rotation angle and calculates the slope. It relates to a tilt sensor using a ruler.

In general, the tilt sensor is an automobile wheel alignment meter, car lift automatic leveler, car burglar alarm system, car tilt monitor, rotary encoder, suspension control using car tilt, alignment control of machine tools, combine robot, agricultural machinery, industrial robot, etc. It is applied to various industrial fields such as medical equipment, construction equipment, bridge slope or excavation ground monitoring, and theft alarm alarm.

As such, the inclination sensor measures the inclination of the object to be measured for the purpose or function of the device to be mounted. To introduce one example of the related art for this, the inclination sensor has a fillable space of liquid. The tilt sensor was constructed by adhering three PCBs with epoxy resin as much as possible.

The conventional liquid-filled tilt angle sensor using the conventional PCB has two upper plates separated from each other, and an upper layer PCB formed at the bottom thereof, and an intermediate layer PCB formed at the center of the hole for forming an internal space filled with a dielectric and an electrically separated sheet. The lower PCB having two pole plates formed on the upper surface thereof is bonded to each other by an epoxy resin, and a dielectric is injected into the inner space between the upper PCB and the lower PCB, thereby measuring the inclination of the measured object.

However, such a conventional inclination sensor has a problem in that its characteristics change according to temperature and humidity, making various situations difficult or causing fatal problems in accurate measurement and measurement.

The present invention has been made to solve the above problems, the object of the present invention is that the change of the characteristics due to the environment, such as temperature or humidity does not occur due to the tilt sensor using a Hall element that is not affected by the environment, such as weather or temperature The purpose is to provide.

In addition, an object of the present invention is to configure the Hall element and the magnetic so that accurate measurements can be made in an external poor environment, and the angle of inclination can be measured by detecting the amount of change in the electric field of the magnetic at the Hall element in the rotation range of the magnetic element It is to provide a tilt sensor using a Hall element.

The present invention includes the following examples in order to achieve the above object.

The first embodiment of the present invention, the magnetic pole having the N pole and the S pole fixed, the support shaft fixed to the center of the magnetic, the bearing and the center weight fixed to the support shaft to prevent rotation and vibration of the support shaft And a housing in which the bearing is mounted, and a Hall element for calculating an inclination by detecting an amount of change in the electric field according to the positions of the N pole and the S pole of the magnetic, wherein the Hall element is integrated with a plurality of magnetoelectric conversion elements used as sensing means. A substrate, a base on which the substrate is mounted, a hol field detector disposed on one side of the substrate and positioned to be close to the magnetic to detect positions of the N pole and the S pole of the magnetic, and the other side of the substrate. A microprocessor and a microprocessor configured to calculate a slope according to the electric field detection signal output from the holfield detection unit and output the digital signal as a digital signal And an interface for outputting a signal output from the processor to an external device, wherein the interface is coupled to a hole field detector, and has a PWM output terminal and an analog output terminal by an A / D converter of the hole field detector and a microprocessor. It is done.

In the tilt sensor using the Hall element according to the present invention, the hole field detection unit sets the coordinates on the upper and lower sides and left and right sides, and different when the N pole and the S pole of the magnetic are located between the coordinates and the respective coordinates. Outputs a detection signal having the number of bits, the PWM signal output from the PWM output terminal is independently output to the PWM terminal of the device, an analog conversion circuit is provided between the analog output terminal and the hol field detection unit, the analog The conversion circuit is characterized by consisting of a harmonic noise canceling circuit and a two-stage smoothing circuit.

In the tilt sensor using the Hall element according to the present invention, the two-stage smoothing circuit includes a first smoothing circuit and a second smoothing circuit, and the first smoothing circuit includes a first resistor and a first capacitor. The signal is first smoothed by the time constant, and the detection signal detected by the hol field detector is secondarily passed through the second smoothing circuit and finally converted into an analog signal.

As described above, the present invention uses a magnetic field change amount that is not affected by temperature, humidity, etc., and thus has perfect durability to adapt to poor external environments. Suddenly, accurate measurement is possible.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the tilt sensor using a Hall element according to the present invention will be described in detail.

1 is a front perspective view showing a preferred embodiment of the tilt sensor using the Hall element according to the present invention, Figure 2 is a side view and an exploded perspective view showing a preferred embodiment of the tilt sensor using the Hall element according to the present invention.

1 and 2, the tilt sensor according to the present invention includes a magnetic pole having an N pole and an S pole, a support shaft 11 supporting the magnetic 10, and rotation of the support shaft 11. And a bearing 13 and a center weight 12 fixed to prevent movement, and a Hall element 20 for detecting an electric field change amount of the magnetic 10 and outputting it as a digital signal. Hall element 20 applied to the present invention is composed of a substrate on which a plurality of magnetoelectric conversion elements used as a sensing means is integrated and a base 24 on which the substrate is mounted. There is provided a mounting groove 22 to be mounted.

The magnetic 10 is located close to the substrate located at the center of the Hall element 20 including both the N pole and the S pole, and is fixed at the original position regardless of the rotation of the Hall element 20.

In addition, the support shaft 11 is fixed to the central weight 12 on one side of the magnetic 10, the other side through the bearing 13 to prevent the movement by the rotation or vibration of the magnetic (10) the magnetic ( 10) is fixed by its own weight. The bearing 13 is also mounted to the housing 25, the base 24 and the housing 25 being joined in a conventional manner, for example by screws.

In addition, the central weight 12 is fixed to the support shaft 11 so as to have a center of gravity from a predetermined portion of the support shaft 11 is installed with a weight center to prevent the rotation of the support shaft (11). Preferably, the center weight 12 is elliptical, so that the support shaft 11 penetrates in one side of the elliptical shape and the other side is located in the lower direction so that the center of gravity naturally faces downward, so that the support shaft 11 Prevent it from rotating.

When the device on which the tilt sensor is mounted is tilted or rotated, the hall element 20 detects a change amount of an electric field emitted from the fixed magnetic 10 and rotates around the magnetic 10 and tilts according to the change amount. Calculate and output That is, since the Hall element 20 is rotated about the fixed magnetic 10, the Hall element 20 detects the electric field emitted to the N pole and the S pole of the fixed magnetic 10. When the Hall element 20 is not rotated and is rotated, the slope is calculated by the amount of change of the electric field according to the positions of the N pole and the S pole of the magnetic 10 and outputted. To this end, the hall element 20 includes the configuration of FIG. 3.

3 is a block diagram showing a tilt sensor using a Hall element according to the present invention.

Referring to FIG. 3, in the inclination sensor using the Hall element 20 according to the present invention, the Hall element 20 includes a Hall field detector 21 and a Hall field detector 21 for detecting an electric field of the magnetic 10. An interface including a microprocessor 22 for receiving an analog signal detection signal outputted from the microcomputer 22, calculating a slope, converting the digital signal into a digital signal, and outputting the digital signal output from the microprocessor 22 to an external device ( 23). That is, the hole field detection unit 21 is provided on one side of the substrate to face the magnetic 10, and the microprocessor 22 is provided on the other side of the substrate in the internal space of the base 24. The interface 23 is mounted in the mounting groove 22 formed in the base 24.

The hole field detection unit 21 is rotated in accordance with the rotation of the Hall element 20 around the magnetic 10 to detect the amount of change in the electric field different according to the position of the N pole and the S pole of the magnetic 10. Output to the microprocessor 22.

The microprocessor 22 calculates a slope by calculating an electric field variation detection signal output from the hole field detection unit 21, converts the calculated slope as a digital signal, and outputs it to the interface 23.

The interface 23 is preferably divided into an analog output terminal, a PWM output terminal, and a HEX output terminal to be used according to a user's request. The analog output terminal converts the digital signal output from the microprocessor 22 into an analog signal and outputs the analog signal.

7 is a diagram illustrating an example of an interface circuit according to the present invention.

As shown in FIG. 7, the interface 23 is coupled to the hole field detector 21, and the PWM output terminal PWM by the A / D converter of the hole field detector 21 and the microprocessor 22. It has analog output terminal (ANALOGE).

The PWM signal output from the PWM output terminal PWM is independently output to the PWM terminal of the device, and an analog conversion circuit is provided between the analog output terminal ANALOGE and the holfield detector 21.

This analog converter circuit is shown in Fig. 7, the analog converter circuit is a harmonic noise cancellation circuit _CN. And a two-stage smoothing circuit, wherein the two-stage smoothing circuit consists of a first smoothing circuit composed of R ₁ and C ₁ and a second smoothing circuit composed of R ₂ and C ₂ .

The first smoothing circuit is first smoothed by the time constants of R ₁ and C ₁ , and the detection signal detected by the hol field detector is secondarily passed through the second smoothing circuit and finally converted into an analog signal. do. In addition, the load resistance value of the analog signal RL = R ₁ + R ₂ .

The determination of the RL value is determined by the load side, and the load resistance value RL≥10KΩ. FIG. 8 is a signal correspondence diagram between an analog signal and a PWM.

Hereinafter, the operation of the tilt sensor using the hall element 20 according to the present invention including the above configuration will be described in detail with reference to FIGS. 4 to 6.

Figure 4 is a graph showing the rotation range of the magnetic in the tilt sensor using the Hall element according to the present invention, Figure 5 is a diagram showing the phase angle arrangement of the magnetic in the tilt sensor using the Hall element according to the invention, Figure 6 Figure is a view showing the output signal of the tilt sensor using a Hall element according to the present invention.

 4 to 6, the inclination sensor using the Hall element 20 according to the present invention has the Hall element centered on the magnetic shaft 10 fixed by the support shaft 11 and the center weight 12. The tilt is calculated by detecting the displacement amount at which the 20 is rotated.

That is, the Hall element 20 has the hole field detection unit 21, as shown in FIG. 5, having coordinates of Y1 and Y2 on the upper and lower sides and X1 and X2 on the left and right sides, and the coordinates and N of the magnetic 10. The slope is calculated according to the positional gap between the pole and the S pole.

Therefore, when the N pole and the S pole of the magnetic 10 are located at the Y1 and Y2 coordinates, respectively, the hole field detection unit 21 detects the displacement amount of the electric field detected at this time, and the microprocessor detects the hole field detection unit ( The field detection signal of 21) is calculated to calculate that the slope is 0 degrees. The interface 23 outputs the digital signal of the microprocessor 22 as a waveform as shown in FIG. 6. At this time, the signal output from the interface 23 displays the respective slopes compared to the resolution of the N bit of the hole field detection unit 21, as shown in the graph of FIG.

That is, referring to the graph of FIG. 4, the hole field detection unit 21 has n-bit resolution, and the hole field detection unit 21 rotates around the magnetic 10 according to the number of bits of the field detection signal. It displays the rotation angle of.

In other words, if the N pole is located between the coordinates of the Y1 and X1, and the S pole is located n / 2 bits between the Y2 and X2 coordinates, the microprocessor 22 is the graph of FIG. Calculate the tilt angle corresponding to n / 2 bits as

Therefore, in the present invention, even if the Hall element 20 rotates 360 degrees around the magnetic 10 to reach the coordinates of Y1 and Y2, which are the original positions, the Hall element 20 is not calculated as a slope of 0 degrees. As the output signal of 1 bit of 21 is gradually changed to the output signal of n bit, it can be recognized that the Hall element 20 is rotated 360 degrees (see FIGS. 4 and 6).

1 is a front perspective view showing a preferred embodiment of a tilt sensor using a Hall element according to the present invention;

2 is a side view and an exploded perspective view showing a preferred embodiment of the tilt sensor using a Hall element according to the present invention;

3 is a block diagram showing a tilt sensor using a Hall element according to the present invention;

Figure 4 is a graph showing the rotation range of the magnetic in the tilt sensor using a Hall element according to the present invention,

5 is a view showing a phase angle arrangement of magnetic in a tilt sensor using a Hall device according to the present invention;

6 is a view showing an output signal of the tilt sensor using a Hall element according to the present invention;

7 illustrates an example of an interface circuit according to the present invention;

8 is a signal correspondence diagram between an analog signal and a PWM.

* Description of the symbols showing the main parts of the drawings *

10 magnetic 11 support shaft

12: center weight 20: Hall element

21: hol field detector 22: a microprocessor

23: interface

Claims (3)

Fixed magnetic with N pole and S pole, Support shaft is fixed to the center of the magnetic, A bearing and a center weight fixed to the support shaft to prevent rotation and vibration of the support shaft, A housing in which the bearing is mounted; Hall device for detecting the amount of change in the electric field according to the position of the magnetic poles of the magnetic pole and the slope of the magnetic, The Hall element is A substrate in which a plurality of magnetoelectric conversion elements used as sensing means are integrated; A base on which the substrate is mounted; A hol field detector provided on one side of the substrate and positioned to be close to the magnetic to detect positions of the N pole and the S pole of the magnetic; A microprocessor provided on the other side of the substrate to calculate a slope according to the electric field detection signal output from the hole field detection unit and output the digital signal as a digital signal; An interface for outputting a signal output from the microprocessor to an external device, And the interface is coupled to the hole field detector, and has a PWM output terminal and an analog output terminal by the A / D converter of the hole field detector and the microprocessor. The method of claim 1, The hole field detection unit sets coordinates on both the upper, lower, left and right sides, and outputs a detection signal having a different number of bits when the N pole and the S pole of the magnetic are located between the coordinate and each coordinate, The PWM signal output from the PWM output terminal is independently output to the PWM terminal of the device, An analog conversion circuit is provided between the analog output terminal and the hol field detector. And said analog conversion circuit comprises a harmonic noise canceling circuit and a two-stage smoothing circuit. The method of claim 2, The two stage smoothing circuit is composed of a first smoothing circuit and a second smoothing circuit, The first smoothing circuit is first smoothed by the time constant of the first resistor and the first capacitor, And a detection signal detected by the hol field detector is secondly passed through the second smoothing circuit and finally converted into an analog signal.

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