WO2014190943A1 - 液位传感器系统 - Google Patents
液位传感器系统 Download PDFInfo
- Publication number
- WO2014190943A1 WO2014190943A1 PCT/CN2014/078997 CN2014078997W WO2014190943A1 WO 2014190943 A1 WO2014190943 A1 WO 2014190943A1 CN 2014078997 W CN2014078997 W CN 2014078997W WO 2014190943 A1 WO2014190943 A1 WO 2014190943A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- axis
- fixing portion
- sensor system
- liquid level
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/48—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using twisted spindles as transmission elements
- G01F23/54—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using twisted spindles as transmission elements using magnetically actuated indicating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/48—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using twisted spindles as transmission elements
- G01F23/54—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using twisted spindles as transmission elements using magnetically actuated indicating means
- G01F23/543—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using twisted spindles as transmission elements using magnetically actuated indicating means using magnets only as coupling means in a mechanical transmission path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
- G01F23/38—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using magnetically actuated indicating means
Definitions
- the invention has innovations in the following fields of technology: "liquid level sensor”, “magnetic angle sensor”, and “magnetic rotation sensor”, in particular, a liquid level sensor system capable of measuring the liquid level in a container.
- Blackburn's U.S. Patent No. 5,419,913 describes a "remote indicating liquid level sensor", and Figure 1 is a schematic view of this patent.
- the problem solved by Blackburn is that the liquid level in the container can be read electronically without placing the electronic components in the container. This is achieved by placing a permanent magnet on the device in the container and having an electronic magnetic probe outside the container.
- the inner permanent magnet is disposed on the curved arm, and as the rotating lever is twisted about the central axis, the permanent magnet rotates together with the curved arm. At this time, the permanent magnet rotates to a larger diameter and can reach several centimeters.
- An external circular array of nine magnetic sensors detects the motion of the permanent magnet. The sensor is discharged at a regular angular spacing on a circular array so that only one or two sensors can detect the presence of permanent magnets at any time.
- the magnetic sensor described is a magnetic reed switch. These electric switches can be opened or closed when the magnetic field force on a thin magnetic reed is large enough to cause the reed to bend into contact with the second electric contact.
- the magnetic field force is generated by the interaction of the magnetic reed and the applied magnetic field.
- the applied magnetic field reaches a certain threshold, the magnetic reed will bend and the electric switch will close.
- the applied magnetic field is smaller than the threshold, the magnetic reed cannot be bent enough to close the electric switch.
- Figures 1 through 3 of the accompanying drawings are derived from U.S. Patent 5,410,913.
- Figure 1 is a cross-sectional view of an electronic remote control level sensor. This sensor system is placed through a hole in the top of the container and has an electrical connection outside the chamber. This design requires the container to be detached from the outside air in an environment that is temperature and pressure different from the outside world. These requirements are determined by its specific application.
- the two main parts of the system are shown here, device A and device B, device A is a mechanical socket, and device B is an electronic sensor module. These two devices are normally mechanically connected together and are shown separately here for ease of viewing and interpretation.
- the conduit 14 provides a structural support for the vertical extension of the level sensing device.
- the conduit 14 has two orifices 27, 28 through which liquid can flow into the lumen 38.
- Such a conduit 14 The liquid level inside is the same as the liquid level 39 in the container.
- the float 15 slides up and down along the Z axis 16.
- the origin is on the top surface of the catheter floor 26.
- the exact calculation for the float 15 above and below the liquid level 39 depends on the ratio of their respective specific gravities. Therefore, as long as the float 15 has a smaller specific gravity than the liquid, it will float vertically on the liquid surface so that the liquid level 39 is between its top and bottom ends, as shown in FIG.
- a permanent magnet 22 is adhered to the upper end of the twistable rigid strip 19, and the rigid strip 19 is bent at a right angle so that when the curved arm 21 extending beyond the radial direction rotates about the axis of rotation (Z-axis) 16, The magnet 22 will enter the recess 30 cut in the fixed top plate 29.
- the raised end ring 25 at the upper end and the bottom plate 26 of the lower end provide mechanical support for the weight of the rigid strip 19.
- the precise mechanical relationship between the vertical position and the angular displacement of the float 15 can be maintained by the physical boundary between the conduit 14, the rigid strip 19 and the float 15.
- a slidable keyway-like notch is formed between the float 15 and the rigid strip 19.
- a slidable groove guide interface is created between the float 15 and the conduit 14, and the rigid strip 19 is twisted, thus acting as a bottom From the function of Z, the normal direction on the surface can be changed smoothly.
- the twisted rigid strip upper end portion 19' is at a distance of Z full from the bottom. To meet the needs of a particular application, the designer can choose a reasonable rotation angle of 9 full .
- the rigid thin strip upper end portion 19' is twisted by 360° with respect to the bottom end portion of the rigid web 19.
- the bending arm 21 on which the permanent magnet 22 is placed is directed at an angle perpendicular to the normal direction of the upper end portion 19' of the rigid strip, and the angle of rotation of the permanent magnet 22 can be obtained (strictly speaking, the permanent magnet 22 and the upper end portion of the rigid thin strip 19)
- Z levf: 1 as a variable describing the vertical position of the liquid level 39; a variable describing the rotation angle 102 in the full and empty state ⁇ Ful ⁇ P ⁇ Empty is a constant; The variables 9 Full and ⁇ Empty in the full slot and empty slot state are constant. Therefore, ⁇
- the linear relationship between Z kvf:1 can be written as:
- Device B includes nine reed switches 41-49 and nine resistors 61-69 that are mounted on PCB 35.
- the switches 41-49 are discharged in a circular array that is coaxial with the rotating shaft 16 and has a radius that satisfies the magnetic field generated only when the permanent magnet 22 is at or near the rotation angle of a given switch. Go to the trigger switch.
- the electrical connection cords 33, 34 transmit electrical signals to the PCB 35 and transmit electrical signals from the PCB 35.
- the sensor module top cover 36 and the sensor module bottom cover 37 provide protection and mechanical support for the PCB 35.
- the finger-shaped snap handle 31 in device A provides permanent or temporary mechanical contact to the notch 32 in device B.
- FIG. 2 is a top plan view of the sensor pad 10 and the fixed top plate 29.
- the finger-shaped snap handles 31 are discharged at a regular angular interval with respect to the rotating shaft 16, and they are all bolted to the sensor pad 10 through the holes.
- FIG. 3 is a top view of the PCB 35 and its components.
- Switches 41-49 are normally open, that is, they are not conducting under "low magnetic field” conditions, but in high-intensity magnetic fields they are closed and their resistance is zero. This switch closes when the permanent magnet 22 is close to a particular switch.
- terminals 50-51 are the external electrical contacts of the measurement circuit.
- Resistors 61-69 are connected in series between terminals 50 and 51.
- One end of each of the reed switches 41-49 is electrically connected to the terminal 51, and the other end is connected to a contact point between each of the resistors 61-69. If switches 41-49 are all open, the resistance measured between terminals 50 and 51 is the sum of the resistances of resistors 61-69. If only switch 49 is closed, the measured resistance is the sum of the resistances of resistors 61-68. If only switch 48 is closed, the measured resistance is the sum of the resistances of resistors 61-67.
- This calculation logic applies to all switch position points such that when the permanent magnet 22 is rotated from 0 degrees to 360 degrees, the measured resistance between the terminals 50-51 is discontinuous as the switches 41-49 are closed one by one. Increase.
- the present invention uses the same or similar rigid belt rotation mechanism, but is an improved magnetic sensing system.
- the next two figures will explain the magnetic probing geometry. The figure shows the position and orientation of the magnetic angle sensor and the permanent magnet. The angle of rotation of the permanent magnet is detected by the angle sensor.
- FIG. 4 is a perspective view and a cross-sectional view showing a positional relationship between a magnetic field angle sensor chip and a permanent magnet.
- the permanent magnet 105 rotates about the rotating shaft 16 in the rotational direction 101, the magnitude of which is given by the angle of rotation 102.
- An electromagnetic resistance sensor chip is located at or near the rotating shaft 16. Its internal sensing element is designed with sensitive axes along the X-axis 8 and Y-axis 9.
- the magnetic field angle sensor chip 103 is fixed relative to the detection coordinate axis and cannot move when the permanent magnet 105 rotates.
- the magnetic field angle sensor chip 103 is mounted on the PCB 104 in a standard manner.
- a gap S 106 is formed between the magnetic field angle sensor chip 103 and the upper surface of the permanent magnet 105.
- Each of the sensing elements in the magnetic field angle sensor chip 103 has two output leads, for a total of four output leads.
- X axis The voltage between each pair of output leads in the sensor is shown as curve 110 in Figure 5; the voltage between each pair of output leads in the Y-axis sensor is shown as curve 111 in Figure 5. These curves represent changes in voltage as the angle of rotation 102 changes.
- magnetoresistive rotation sensor that is common in the prior art.
- two patents with application numbers 201110130222.1 and 201110130202.4 describe a design of a magnetoresistive sensor element that has potential applications in magnetic field angle sensors. These patent documents are hereby incorporated by reference.
- the present invention provides a level sensor system that not only reduces size, reduces cost, but also improves performance.
- the present invention provides a liquid level sensor system for remote monitoring of a liquid level in a container, the sensor system comprising:
- the first level response element includes:
- the rotating rod is mechanically coupled with the float, and during the floating of the float, the rotating rod rotates around a rotating shaft fixed to the container;
- a permanent magnet disposed at an upper end of the rotating rod and rotating together with the rotating rod;
- a second-stage responsive element comprising: a PCB fixedly disposed on the second fixing portion, a magnetoresistive angle sensor chip deposited on the PCB and facing the permanent magnet, and a control circuit electrically connected to the magnetoresistive angle sensor chip;
- the magnetoresistive angle sensor chip outputs an analog voltage signal to the control circuit according to a rotation angle of the permanent magnet, and the control circuit calculates a liquid level in the current container according to the analog voltage signal.
- the rotating rod is rotated by n times 360 degrees, wherein n is an integer greater than or equal to 1, the height of the liquid surface and the rotating rod
- the rotation angle is linearly proportional.
- the magnetoresistive angle sensor chip is constructed of a TMR sensing element.
- the magnetoresistive angle sensor chip comprises two independent sensors, one of which is an X-axis sensor, The other is a Y-axis sensor, the sensitive axis of the X-axis sensor is an X-axis, and the sensitive axis of the X-axis sensor is a ⁇ axis, wherein the X-axis and the ⁇ -axis are in the same plane, and between the X-axis and the ⁇ -axis The angle is 90°.
- the component of the stray field generated by the permanent magnet on the magnetoresistive angle sensor chip has a 360 degree symmetry in the sensing plane.
- the sensing plane is parallel to the pupil plane and spaced apart from the upper surface of the permanent magnet by a distance.
- the analog voltage signal output by the magnetoresistive angle sensor chip is a single value function of the rotation angle of the permanent magnet.
- the analog voltage signal is converted to a standard digital signal format, the standard digital signal format being pulse width modulated.
- the pulse width modulated output value is in a linear relationship with the rotation angle of the permanent magnet.
- the first fixing portion and the second fixing portion are detachably connected.
- an adjustment structure for adjusting the height of the permanent magnet is disposed between the first fixing portion and the container.
- a first hole is defined in the first fixing portion, and an upper end of the rotating rod extends upwardly from the center hole, and the rotating rod is suspended from the first fixing portion, and the first fixing portion is further provided with a hole a sealed housing for isolating the container from the outside, the second fixing portion being relatively fixed to the sealing housing.
- control circuit comprises a magnetic angle sensor circuit, a power supply circuit and a signal processing circuit.
- the sensor system comprises a wireless sensor module, the wireless sensor module implements wireless communication through a wireless communication line, and the wireless sensor module obtains electrical energy from a battery.
- the present invention replaces a complex curved rod-shaped magnetic arm with a simple straight-rod magnetic arm.
- This more compact magnet arrangement enables a regular change of the magnetic field, using a single position
- the magnetic angle sensor can detect the change in the angle of the magnetic field at or near the axis of rotation of the rotating rod.
- the present invention replaces such a large circular array of nine reed switches with a single solid state reluctance switch.
- the liquid level sensor provided by the invention has the advantages of smaller size, simpler control circuit, higher reliability, higher resolution of the detection liquid level, and improved electrical communication method.
- FIG. 1 is a cross-sectional view of an electronic remote control level sensor system of the prior art U.S. Patent No. 5,409,913.
- Figure 2 is a plan view of the weir portion of Figure 1.
- Figure 3 is a plan view of portion B of Figure 1.
- 4 is a perspective view and a cross-sectional view showing a positional relationship between a magnetic field angle sensor and a permanent magnet.
- Figure 5 is a graph showing the relationship between the analog voltage signal of the sensor and the rotation angle of the X-axis sensor and the Y-axis sensor.
- Figure 6 is a cross-sectional view showing a liquid level sensor system of a first embodiment of the present invention.
- Figure 7 is a plan view of the apparatus 1 of Figure 6.
- Figure 8 is a top plan view of the device 2 of Figure 6.
- Figure 9 is a circuit block diagram of the magnetic angle rotation sensor.
- Figure 10 is a waveform diagram of a pulse width modulated output pulse width modulated output signal.
- Figure 11 is a graph showing the relationship between the duty cycle and the rotation angle ratio of the PWM waveform.
- Figure 12 is a cross-sectional view showing a liquid level sensor system in accordance with a second embodiment of the present invention.
- Figure 6 is a cross-sectional view of an electronic remote control level sensor system.
- a liquid level sensor system includes a first fixed portion 1, a first stage responsive element, a second fixed portion 2, and a second stage responsive element.
- This sensor system is placed at the top of the container through a hole and has an electrical connection point outside the container cavity.
- This design requires the container to be detached from the outside air in an environment that is temperature and pressure different from the outside world, as determined by its particular application.
- the figure shows the two main parts of the system, the lower half of which is the first fixed part 1 and the first stage responsive element, the upper part being the second fixed part 2 and part of the second stage responsive element. These two parts are mechanically connected together under normal conditions, and they are shown separately here for ease of observation and interpretation.
- the first fixing portion 1 is fixedly disposed at the opening of the container.
- the first fixing portion 1 includes a finger spring lock 131 and a top flange 132.
- An adjustment bolt 128 is disposed between the top flange 132 and the container wall 140.
- the position of the top flange 132 can be adjusted up and down to adjust the distance between the permanent magnet and the magnetoresistive angle sensor chip.
- the lower portion of the first fixed portion 1 is provided with a conduit 14, which provides a structural support for the vertical extension of the level sensing device.
- the conduit 14 is provided with a flow guiding hole 27 through which the liquid can flow into the lumen 38, so that the liquid level in the conduit 14 is the same as the liquid level 39 in the container, and
- the conduit 14 is provided with the same flow guiding holes 28 as in Fig. 1, which is not shown in Fig. 6.
- the first stage response element includes a float 15, a rotating rod 19, and a permanent magnet 139.
- the rotating rod 19 of the present invention is also the twistable rigid strip 19 mentioned above, and the float 15 can float up and down as the level of the liquid level in the conduit 14 changes.
- the rotating rod 19 and the float 15 are mechanically coupled by the sliding piece 20, and during the floating of the floating element 15, the rotating rod 19 is rotated.
- the movement is only about a rotation axis 16 fixed relative to the container, and the permanent magnet 139 disposed at the upper end of the rotation lever 19 also rotates together with the rotation lever 19.
- the angle of rotation of the rotating lever 19 is n times 360 degrees, and n is an integer equal to 1 or greater than 1.
- the position of the liquid level 39 is proportional to the rotation angle of the rotating rod 19. For example, when the container is empty, that is, the liquid level 39 is 0%, the rotation angle of the rotating rod 19 is 0 degree, and when the liquid level is 50%, the rotation angle of the rotating rod 19 is 180 degrees, and when the container is full, the liquid is The position 39 is 100%, and the rotation angle of the rotating lever 19 is 360 degrees.
- a disk 137 is fixed to the tip end of the rotating lever 19.
- the weight of the disc 137 and other forces applied thereto, the tip portion of the rotating rod 19 and all other additional material are supported by a support ring 134 which is a pointed projection on the support strip 133.
- the permanent magnet 139 is bonded to the top end surface of the disk 137.
- the groove 135 and the snap ring 136 mechanically limit the upward movement of the upper end portion of the rotating lever 19.
- the rotating lever 19 rotates around the rotating shaft 16, thereby driving the rotation of the permanent magnet 139.
- the rotating lever 19 cannot move in the axial direction.
- the second fixing portion 2 is located above the first fixing portion 1, and the second fixing portion 2 is fixedly connected to the first fixing portion 1.
- the first fixing portion 1 is formed with a finger-shaped spring lock 131 extending upward with respect to the flange 132, and the second fixing portion 2 is provided with a notch 126 corresponding to the finger-shaped spring lock 131.
- the second fixing portion 2 can be removed from the first fixing portion 1. Whether the second fixing portion 2 and the first fixing portion 1 are fixedly bonded or temporarily bonded depends on actual needs.
- the second fixing portion 2 includes a top plate 121 and a bottom plate 122.
- a notch 126 is provided in the top plate 121, and the top plate 121 is latched by the finger spring lock 131 through the notch 126.
- the alignment holes 138 are fixed to each other by providing alignment holes 138 on the top plate 121, the PCB 104, and the bottom plate 122.
- the alignment holes of the top plate 121 are threaded, and no screws are shown in the drawing. If they are permanently installed, the threaded holes should be on the top flange 132 of the device, and the alignment holes on the top plate 121 and the bottom plate 122 should be through holes.
- the second fixing portion 2 can also fix the PCB 104 by using a removable retaining clip, which is not shown in the figure and the retaining clip.
- a plurality of upwardly extending projections are formed on the bottom plate 122, including a sensor support 123 for supporting the magnetoresistive angle sensor chip 103, and a circuit board bottom support 124 for supporting the PCB 104.
- a plurality of downwardly extending projections are formed on the top plate 121, including a circuit board top support 125 for supporting the PCB 104.
- the purpose of these three supports is to prevent the rotation of the PCB 104 and any vibration of the magnetoresistive angle sensor chip 103 relative to the permanent magnet 139. Moving or moving, this avoids the generation of erroneous magnetic signals in the magnetoresistive angle sensor chip 103. It is also within the scope of the invention to connect these components together.
- These methods include: potting, external counterparts, rivets, injection of molten plastic, and all other standard electrical packaging techniques known to the public.
- the functions of these fixing methods are: 1) maintaining the magnetoresistive angle sensor chip 103 at an appropriate position on the rotating shaft 16, and at the designed gap S106; 2) being able to connect the power source; 3) being capable of data communication connection; 4) protecting The environment of the magnetic rotation sensor.
- the selection of materials, potting materials, and fasteners for these components is subject to two conditions: magnetic compatibility and optional visual clarity (if desired, the top of the disc 137 and/or the permanent magnet 139 can be visually inspected Rotation of features, lines or marks as an aid to measurement methods and calibration techniques).
- the top plate 121 may be a ferromagnetic material such as soft magnetic steel to provide "magnetic shielding" between the magnetoresistive angle sensor chip 103 and the field source outside the second fixing portion 2.
- a magnetic shielding block (not shown) may be attached to the top of the top plate 121. This does not change the physical properties of the magnetoresistive angle sensor chip 103 below it, but can better at the magnetoresistance angle.
- a "magnetic shield” is provided between the sensor chip 103 and the field source outside the second fixing portion 2.
- the second fixing portion 2, all other components on the top flange 132 should be non-magnetic metal, plastic, wood, glass, ceramic, polymer, and the like.
- the second stage responsive element includes a printed circuit board PCB 104 fixedly disposed on the second fixed portion, and a magnetoresistive angle sensor chip 103 deposited on the printed PCB 104 and facing the permanent magnet 139.
- the magnetoresistive angle sensor chip 103 is composed of a TMR sensing element that outputs an analog voltage signal to the control circuit according to the rotation angle of the permanent magnet 139, and the control circuit calculates the liquid level in the current container based on the analog voltage signal.
- Fig. 7 is a plan view showing the second fixing portion 2 and the second-stage responsive element removed. It shows the position of the rotation angle 102 of the upper end portion of the rotation lever 19 and the permanent magnet 139 which has an angular rotation direction 101 with respect to the rotation shaft 16.
- the magnetoresistive angle sensor chip 103 does not rotate.
- the top flange 132 is secured to the container wall 140 by bolts 128 through the mounting holes 142 of the top flange.
- Figure 8 is a plan view of some of the components of the second fixed portion 2 and the second stage responsive element.
- the figure shows the circular outline of the bottom plate 122.
- the top plate 121 is not shown in the drawing, only the notch 126 aligned with the finger spring lock 131 is shown.
- the rectangular outline is the front side of the printed circuit board PCB 104, and its key features include an alignment hole 138 and a magnetoresistive angle sensor chip 103.
- the left end is the electrical connection of the PCB 104. These include the power supply terminal 151, the signal terminal 152 and the ground terminal 153.
- the flexible wires can be soldered at these terminals, a standard card edge connector can slide at this end, or a spring
- the clip connector can be clamped at this end of the PCB 104.
- the raised circuit board bottom support 124 provides mechanical support for the PCB 104
- the magnetoresistive angle sensor chip 103 is supported by the raised sensor support 123.
- the top end flange 132 of the first fixing portion 1 is not provided with an opening unless it is used to bolt the container wall 140.
- a flange is formed in the flange 220.
- a narrow portion of the rotating rod 19 passes through the center hole, and the rotating rod 19 is suspended from the flange 220, as shown in FIG.
- a sealing housing 221 for isolating the container from the outside is provided on the flange 220, and the second fixing portion 4 is fixedly coupled to the sealing housing 221.
- the sealing housing 221 is provided with a finger-shaped engaging handle 222
- the second fixing portion 4 is provided with a notch corresponding to the finger-shaped engaging handle 222.
- the support ring 134 is moved to the top end of the flange 220, which supports the weight and other forces of the disc 137.
- the groove 135 and the snap ring 136 are the same as in Fig. 6.
- the parts not shown in the figure are also the same as in Fig. 6.
- the level sensor signal can be used in higher level systems and must have a means of communicating with higher level systems. It may also reduce the original analog signal of the magnetic angle sensor, providing signals that can be used in digital electronics. Communication between the sensor system and higher-level systems can be through a set of wires, a data bus (I 2 C, RS232, IEEE 488, Ethernet, USB, etc.) or wireless network (WIFI, Bluetooth, IoT, etc.) To achieve, choose which method is determined by the communication protocol selected by the user. In addition, this communication can also be achieved by a visual signal such as an LED display that can be read by a person in the same space as the container. It goes without saying that a level sensor using a combination of these communication methods and similar other methods is also within the scope of the present invention.
- the control circuit has three main circuit modules, each of which has one or more sub-circuits.
- the three main circuit modules are a magnetic angle sensor circuit 161, a power supply circuit 162, and a signal processing circuit 163. It must be noted herein that this particular choice of dividing the circuit into sub-circuits is not exclusive and is not limited by the protection of the present invention, but is merely to more easily explain the present invention and many of the components of the present invention.
- the magnetic angle sensor circuit 161 is electrically connected to the magnetoresistive angle sensor chip 103.
- the chip includes an X-axis magnetoresistive sensor 171 and a Y-axis magnetoresistive sensor 172.
- the sensitive axis of the X-axis magnetoresistive sensor 171 is an X-axis and a Y-axis magnetic field.
- the sensitive axis of the resistive sensor is the Y-axis, wherein the X-axis and the Y-axis are in the same plane, and the angle between them is 90 degrees.
- the sensing planes of the two sensors are parallel to the XY plane, and the sensing plane is spaced apart from the upper surface of the permanent magnet 139 by a distance, as shown by the gap S106 in FIG.
- the magnetic angle sensor circuit 161 has two sub-circuits: one for the X-axis magnetoresistive sensor 171 and the Y-axis magnetoresistive sensor 172 for V cc 164 or V Ref 170, and the other for the X-axis magnetoresistive sensor 171 and the Y-axis magnetic field.
- the resistance sensor 172 is connected to the ground terminal 166.
- Power circuit 162 is capable of absorbing electrical energy from the battery and distributing the electrical energy to other portions of the circuit in an efficient, smooth manner.
- the circuit has two sub-circuits: a power supply 168 and a power conditioning circuit 169.
- the signal processing circuit 163 has many functions.
- the communication protocol 177 defines a method of receiving information from the sensor system.
- the signal processing circuit 163 must receive the original voltage signal from the magnetic angle sensor circuit 161 and convert the signal into an acceptable form.
- the first sub-circuit is an analog preamplifier circuit 173 which amplifies the signal value according to the design value and uses a filter to help remove unused signals.
- the second sub-circuit is an analog to digital conversion circuit 174 that receives the amplified analog signal (in volts or amperes) output from the analog preamplifier circuit 173 and converts these signals into digital signals (in units of bits).
- the third sub-circuit is an output formatting circuit 175 containing digital circuitry and algorithms that primarily converts the digital signals produced by analog to digital conversion circuitry 174 into values and formats that are acceptable to communication protocol 177.
- the next sub-circuit is the microcontroller circuit 176, which primarily communicates with the communication protocol 177 via an input/output circuit 178 (also known as a digital interface circuit) and stores and retrieves data in the data circuit 179 and the system control circuit 180.
- System control circuit 180 is for transmitting signals to other sub-circuits in the system.
- the output signal of the microcontroller circuit 176 is ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 165.
- the X-axis sensor and the Y-axis sensor output corresponding analog voltage signals according to the rotation angle of the permanent magnet 139, the signals they output reflect the magnetic field generated by the permanent magnet 139. It can be seen from the curves 110 and 111 in Fig. 5 that the components of the stray field generated by the permanent magnet in the sensing plane have a 360 degree symmetry, that is, within the range of 360 degrees of the rotation of the permanent magnet, the total amplitude value of the stray field is not Change, direction is different.
- the output signal is formatted into a pulse width modulation format, which uses only three Electrical connections: Power supply V CC 164, signal output 165 and ground GND166. These terminals are connected to connection pads 151, 152 and 153 on the PCB 104, respectively.
- This embodiment describes a liquid level detecting system having a digital processing output.
- the two linear analog voltage signals shown by curves 110 and 111 are converted into a single digital waveform, which is waveform 30 in FIG.
- This curve represents the relationship between the voltage and time signals, the time is the horizontal axis, and the waveform 30 is a cyclic function with a fixed period 21T CYDF:.
- the voltage value of waveform 30 is not VL. W 24, is V HIGH 25.
- the time of each cycle of waveform 30 at voltage V Hig h 25 is T HIGH 22 at voltage VL.
- the time at W 24 is TL. W 23.
- T HIGH and TL are shown.
- w is 700 microseconds and 300 microseconds respectively
- T CYDF: 21 is 1000 microseconds.
- the mathematical ratio of T HIGH 22 to T CYDF: 21 is called the "output duty cycle" and is expressed as a percentage (%).
- the external power and signal connections are on the connection pads 151, 152, 153 at the left end of the PCB 104, which are the connection terminals for the pulse width modulation (PWM), the output, and the ground.
- PWM pulse width modulation
- the upper end portion of the rotating lever 19 is rotated from the 0° position to the 324° position, and the PWM voltage output between the connection pads 152 and 153 is as shown by the curve 29 of FIG. In this embodiment of the invention, the angle of rotation cannot exceed 360 degrees.
- the sensor module 231 does not display a line connection, it obtains power from the battery 232, and communicates via the communication protocol 177 using the wireless communication line 233.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2016515646A JP6420825B2 (ja) | 2013-05-31 | 2014-05-30 | 液面センサシステム |
EP14804604.8A EP3006906B1 (en) | 2013-05-31 | 2014-05-30 | Liquid level sensor system |
US14/894,271 US9964427B2 (en) | 2013-05-31 | 2014-05-30 | Liquid level sensor system |
Applications Claiming Priority (2)
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EP4019913A4 (en) * | 2019-08-23 | 2023-08-30 | MultiDimension Technology Co., Ltd. | MAGNETIC LEVEL GAUGE |
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CN103278216A (zh) | 2013-09-04 |
EP3006906A4 (en) | 2017-01-18 |
EP3006906A1 (en) | 2016-04-13 |
JP6420825B2 (ja) | 2018-11-07 |
JP2016522410A (ja) | 2016-07-28 |
US9964427B2 (en) | 2018-05-08 |
US20160123789A1 (en) | 2016-05-05 |
EP3006906B1 (en) | 2021-07-21 |
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