CN114062991A - Detection method and system of switch type Hall sensor - Google Patents
Detection method and system of switch type Hall sensor Download PDFInfo
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Abstract
The application relates to a detection method and a system of a switch type Hall sensor, wherein the system comprises a single chip microcomputer, the Hall sensor, an adjustable constant current source and a hollow solenoid, wherein the single chip microcomputer is in PWM control connection with the adjustable constant current source; the adjustable constant current source is electrically connected with two ends of a coil wound on the hollow solenoid to form a conducting loop; the Hall sensor is arranged at one end of the hollow solenoid, the Hall sensor is in communication connection with the single chip microcomputer, and the single chip microcomputer is in communication connection with an upper computer through an RS485 bus. This application magnetic field intensity size and the electric current size and the PWM value size etc. that correspond control when can effectively quantify hall sensor switch on and break off to can effectively adjust the circular telegram electric current size of intelligent water gauge, make the control of opening and shutting to hall sensor more accurate, make the water gauge measurement more accurate.
Description
Technical Field
The application relates to the field of intelligent water meters, in particular to a detection method and a detection system of a switch type Hall sensor.
Background
A hall sensor is a magnetic field sensor made according to the hall effect. The hall effect is one of the magnetoelectric effects, which was found by hall (a.h. hall, 1855-1938) in 1879 when studying the conductive mechanism of metals. Later, semiconductors, conductive fluids and the like have been found to have the effect, the hall effect of the semiconductors is much stronger than that of metals, and various hall elements manufactured by utilizing the phenomenon are widely applied to the aspects of industrial automation technology, detection technology, information processing and the like.
Because in the intelligent water meter application process, hall sensor is as a key device, and hall sensor's the precision of switching on magnetic field intensity and breaking off magnetic field intensity will greatly determine the measurement precision of water meter.
At present, detection of the hall sensor in the market is generally approximate detection of connection or disconnection of the hall sensor, quantitative detection of the magnetic field intensity of the connection or disconnection of the hall sensor cannot be achieved, and then control over the size of the electrifying current of the hall sensor is controlled according to a quantitative detection result, so that accurate control over the hall sensor is achieved, and accurate control over water meter metering is achieved.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a detection method and system of a switching type hall sensor.
In a first aspect, the present application provides a detection system for a switched hall sensor, the detection system comprising: a single chip microcomputer, a Hall sensor, an adjustable constant current source and a hollow solenoid, wherein,
the single chip microcomputer is connected with the adjustable constant current source in a PWM control mode;
the adjustable constant current source is electrically connected with two ends of a coil wound on the hollow solenoid to form a conducting loop;
the Hall sensor is arranged at one end of the hollow solenoid, the Hall sensor is in communication connection with the single chip microcomputer, and the single chip microcomputer is in communication connection with an upper computer through an RS485 bus.
Preferably, the detection system further comprises: the single chip microcomputer is in communication connection with the LCD display screen, and the LCD display screen displays the attraction state of the Hall sensor and the magnetic field intensity of the hollow solenoid in real time.
Preferably, the hollow solenoid is a multi-layer coil hollow solenoid, and the hall sensor is disposed directly above the hollow solenoid.
Preferably, the current control range of the adjustable constant current source is 0-500 mA.
Preferably, the standard pick-up value of the hall sensor is 30GS, and the standard release value of the hall sensor is 10 GS.
In another aspect, the present application provides a detection method for a switch-type hall sensor, which is applied to the detection system for a switch-type hall sensor according to the first aspect, and the method includes:
calculating the relation between the linear magnetic field and the electrified current of the hollow solenoid according to the diameter and the length of the hollow solenoid, the number of turns of the coil, the wire diameter and the thickness of the coil;
the PLC controls the current of the adjustable constant current source to continuously increase and output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
monitoring a PWM value when a Hall sensor to be detected is attracted and conducted, and converting the PWM value into a linear conducting current value;
according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the conduction current value, calculating to obtain the conduction magnetic field intensity when the Hall sensor to be detected is attracted and conducted;
the PLC controls the current of the adjustable constant current source to continuously reduce the output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
monitoring a PWM value when a Hall sensor to be detected is disconnected, and converting the PWM value into a linear disconnection current value;
calculating the off magnetic field intensity of the Hall sensor when the Hall sensor is off according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the off current value;
and determining whether the Hall sensor to be detected is qualified or not according to the conducting magnetic field intensity and the disconnecting magnetic field intensity.
Preferably, determining whether the hall sensor to be measured is qualified or not according to the conducting magnetic field strength and the disconnecting magnetic field strength includes:
determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
judging whether the attraction value and the release value of the Hall sensor to be detected are within a preset attraction range and a preset release range;
if so, determining that the Hall sensor to be detected is qualified, otherwise determining that the Hall sensor to be detected is unqualified.
Preferably, determining whether the hall sensor to be measured is qualified or not according to the conducting magnetic field strength and the disconnecting magnetic field strength includes:
determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
calculating the difference between the attraction value and the release value of the Hall sensor to be detected and the corresponding standard attraction value and standard release value;
and determining whether the Hall sensor to be detected is qualified or not according to the difference value.
Preferably, the method further comprises:
the PLC controls the current of the adjustable constant current source to continuously increase and decrease repeatedly in a PWM mode, and controls the Hall sensor to be attracted and disconnected repeatedly;
the LCD receives the PWM value sent by the PLC and the pull-in state of the Hall sensor to be detected in real time;
and drawing a corresponding curve graph according to the pull-in state of the Hall sensor to be tested and the corresponding PWM value.
Preferably, the relation between the linear magnetic field of the hollow solenoid and the energizing current is B,
n is the number of turns of the coil, R1Radius of hollow solenoid without wound coil, R2Is the radius of the hollow solenoid with the wound coil, I is the current output by the adjustable constant current source, L is the length of the hollow solenoid, mu0For vacuum permeability, Δ R is one third of the thickness of the multilayer coil.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
in the detection method and system of the switch-type hall sensor provided by the embodiment of the application, the PLC controls the adjustable constant current source to continuously output direct current through the PWM function of the I/O port, the current of the PLC can be adjusted from small to large and then from large to small, and further the current passes through the coil of the hollow solenoid, so that the hollow solenoid forms a magnetic field, the on-off state of the hall sensor can be detected according to the influence of the magnetic field, and the magnetic field strength of the hall sensor in the on-off state can be effectively recorded, so that the magnetic field strength of the hall sensor in the on-off state and the current magnitude and PWM value magnitude of corresponding control can be effectively quantized, the electrified current magnitude of the intelligent water meter can be effectively adjusted, the opening and closing control of the hall sensor is more accurate, and the water meter metering is more accurate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a detection system of a switch-type hall sensor according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a detection method of a switch type hall sensor according to an embodiment of the present disclosure;
fig. 3 is another schematic flow chart of a detection method of a switch-type hall sensor according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of another detection method of the switching hall sensor according to the embodiment of the present application;
fig. 5 is a schematic flowchart of a detection method of a switch-type hall sensor according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a detection system of a switch-type hall sensor according to an embodiment of the present disclosure. As shown in fig. 1, the detection system of the switching hall sensor provided by the present application includes: the device comprises a single chip microcomputer, a Hall sensor, an adjustable constant current source, a hollow solenoid, an RS485 bus and an LCD display screen, wherein the single chip microcomputer is connected with the adjustable constant current source in a PWM control mode; the adjustable constant current source is electrically connected with two ends of a coil wound on the hollow solenoid to form a conducting loop; the Hall sensor is arranged at one end of the hollow solenoid, the Hall sensor is in communication connection with the single chip microcomputer, and the single chip microcomputer is in communication connection with an upper computer through an RS485 bus. The single chip microcomputer is in communication connection with the LCD display screen, and the LCD display screen displays the attraction state of the Hall sensor and the magnetic field intensity of the hollow solenoid in real time.
In a specific implementation process, the hollow solenoid is a multi-layer coil hollow solenoid, and the hall sensor is arranged right above the hollow solenoid. The current control range of the adjustable constant current source is 0-500 mA. In addition, in order to effectively ensure accurate metering of the intelligent water meter, the standard suction value of the Hall sensor is 30GS, and the standard release value of the Hall sensor is 10 GS.
Referring to fig. 2, in order to provide a detection method of a switch-type hall sensor according to an embodiment of the present application, a detection system of the switch-type hall sensor is applied, as shown in fig. 2, the detection method of the switch-type hall sensor includes:
step S100: calculating the relation between the linear magnetic field and the electrified current of the hollow solenoid according to the diameter and the length of the hollow solenoid, the number of turns of the coil, the wire diameter and the thickness of the coil;
in the specific implementation process, the relation between the linear magnetic field of the hollow solenoid and the electrified current is marked as B,
n is the number of turns of the coil, R1Radius of hollow solenoid without wound coil, R2Is the radius of the hollow solenoid with the wound coil, I is the current output by the adjustable constant current source, L is the length of the hollow solenoid, mu0For vacuum permeability, Δ R is one third of the thickness of the multilayer coil.
Step S200: the PLC controls the current of the adjustable constant current source to continuously increase and output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
step S300: monitoring a PWM value when a Hall sensor to be detected is attracted and conducted, and converting the PWM value into a linear conducting current value;
step S400: according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the conduction current value, calculating to obtain the conduction magnetic field intensity when the Hall sensor to be detected is attracted and conducted;
step S500: the PLC controls the current of the adjustable constant current source to continuously reduce the output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
step S600: monitoring a PWM value when a Hall sensor to be detected is disconnected, and converting the PWM value into a linear disconnection current value;
step S700: calculating the off magnetic field intensity of the Hall sensor when the Hall sensor is off according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the off current value;
step S800: and determining whether the Hall sensor to be detected is qualified or not according to the conducting magnetic field intensity and the disconnecting magnetic field intensity.
Referring to fig. 3, in a specific implementation, the present application provides one embodiment, where the step 800 further includes:
step S801: determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
step S802: judging whether the attraction value and the release value of the Hall sensor to be detected are within a preset attraction range and a preset release range; if so, go to step S803, otherwise go to step S804.
Step S803: determining that the Hall sensor to be detected is qualified;
step S804: and determining that the Hall sensor to be measured is unqualified.
In the specific implementation process, the preset suction range and the preset release range are determined according to the standard suction value, the standard disconnection value and the standard difference value. Specifically, the preset pull-in range is equal to a range between a maximum value and a minimum value of the standard pull-in value plus or minus a standard difference value, and the preset release range is a range between the maximum value and the minimum value of the standard break-off value plus or minus a standard difference value.
Meanwhile, in the specific implementation process, the standard difference value can be a fixed value obtained in the long-term detection practice, or can be a difference value of two critical values of the hall sensor to be detected when the attraction and the disconnection are realized through multiple measurements, and the average value of the multiple measured difference values is calculated. The details are not set forth herein in detail.
Referring to fig. 4, in the specific implementation process, the present application provides another embodiment: this step 800 further comprises:
step S805: determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
step S806: calculating the difference between the attraction value and the release value of the Hall sensor to be detected and the corresponding standard attraction value and standard release value;
step S807: and determining whether the Hall sensor to be detected is qualified or not according to the difference value.
In the specific implementation process, whether the difference value obtained by the difference between the difference value and the standard difference value is less than 0.1-0.5GS or not can be judged according to the comparison between the difference value and the standard difference value, if so, the Hall sensor is determined to be qualified, and if not, the Hall sensor is determined to be unqualified.
Referring to fig. 5, in a specific implementation process, the detection method of the switch type hall sensor further includes the following steps:
step S901: the PLC controls the current of the adjustable constant current source to continuously increase and decrease repeatedly in a PWM mode, and controls the Hall sensor to be attracted and disconnected repeatedly;
step S902: the LCD receives the PWM value sent by the PLC and the pull-in state of the Hall sensor to be detected in real time;
step S903: and drawing a corresponding curve graph according to the pull-in state of the Hall sensor to be tested and the corresponding PWM value.
In the embodiment of the application, the attraction and the disconnection of the hall sensor to be detected are realized by controlling the current change of the adjustable constant current source for many times, so that multiple groups of corresponding experimental data are detected, such as PWM values, current values, magnetic field strength values and the like, and then corresponding curve graphs can be respectively drawn according to the values, so that PWM values with small differences are obtained according to the attraction state and the disconnection state of the hall sensor to be detected in the curve graphs, and then the PWM values are converted into the current values and the corresponding magnetic field strength values, so that a set of the magnetic field strength values of the hall sensor to be detected in the attraction state and the disconnection state can be obtained, and the minimum value and the maximum value of the set can be used as the reasonable range of the attraction state and the disconnection state of the hall sensor to be detected. And the above standard deviation value and the like can be calculated from the interval, which is not described in detail herein.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A detection system of a switched hall sensor, characterized in that it comprises: a single chip microcomputer, a Hall sensor, an adjustable constant current source and a hollow solenoid, wherein,
the single chip microcomputer is connected with the adjustable constant current source in a PWM control mode;
the adjustable constant current source is electrically connected with two ends of a coil wound on the hollow solenoid to form a conducting loop;
the Hall sensor is arranged at one end of the hollow solenoid, the Hall sensor is in communication connection with the single chip microcomputer, and the single chip microcomputer is in communication connection with an upper computer through an RS485 bus.
2. The detection system of a switched hall sensor according to claim 1, characterized in that it further comprises: the single chip microcomputer is in communication connection with the LCD display screen, and the LCD display screen displays the attraction state of the Hall sensor and the magnetic field intensity of the hollow solenoid in real time.
3. The detection system of the switch type hall sensor according to claim 1, wherein the hollow solenoid is a multi-layer coil hollow solenoid, and the hall sensor is disposed directly above the hollow solenoid.
4. The detection system of the switch type hall sensor according to claim 1, wherein the current control range of the adjustable constant current source is 0-500 mA.
5. The detection system of the switch type hall sensor according to claim 1, wherein the standard pick-up value of the hall sensor is 30GS, and the standard release value of the hall sensor is 10 GS.
6. A method for detecting a switched hall sensor, using a detection system of a switched hall sensor according to any of claims 1 to 5, the method comprising:
calculating the relation between the linear magnetic field and the electrified current of the hollow solenoid according to the diameter and the length of the hollow solenoid, the number of turns of the coil, the wire diameter and the thickness of the coil;
the PLC controls the current of the adjustable constant current source to continuously increase and output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
monitoring a PWM value when a Hall sensor to be detected is attracted and conducted, and converting the PWM value into a linear conducting current value;
according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the conduction current value, calculating to obtain the conduction magnetic field intensity when the Hall sensor to be detected is attracted and conducted;
the PLC controls the current of the adjustable constant current source to continuously reduce the output in a PWM mode, and adjusts the magnetic field change of the hollow solenoid;
monitoring a PWM value when a Hall sensor to be detected is disconnected, and converting the PWM value into a linear disconnection current value;
and calculating the off magnetic field intensity of the Hall sensor when the Hall sensor is off according to the relation between the linear magnetic field and the electrified current of the hollow solenoid and the off current value.
7. The method of claim 6, further comprising: determining whether the Hall sensor to be detected is qualified or not according to the conducting magnetic field intensity and the disconnecting magnetic field intensity; the method specifically comprises the following steps:
determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
judging whether the attraction value and the release value of the Hall sensor to be detected are within a preset attraction range and a preset release range;
if so, determining that the Hall sensor to be detected is qualified, otherwise determining that the Hall sensor to be detected is unqualified.
8. The method for detecting the switch type Hall sensor according to claim 6, wherein determining whether the Hall sensor to be detected is qualified according to the on-magnetic field strength and the off-magnetic field strength comprises:
determining a suction value and a release value of the Hall sensor to be detected according to the conducting magnetic field intensity and the disconnecting magnetic field intensity;
calculating the difference between the attraction value and the release value of the Hall sensor to be detected and the corresponding standard attraction value and standard release value;
and determining whether the Hall sensor to be detected is qualified or not according to the difference value.
9. The method of claim 6, further comprising:
the PLC controls the current of the adjustable constant current source to continuously increase and decrease repeatedly in a PWM mode, and controls the Hall sensor to be attracted and disconnected repeatedly;
the LCD receives the PWM value sent by the PLC and the pull-in state of the Hall sensor to be detected in real time;
and drawing a corresponding curve graph according to the pull-in state of the Hall sensor to be tested and the corresponding PWM value.
10. The detection method of the switch type Hall sensor according to claim 6, wherein a relation between a linear magnetic field of said air core solenoid and an energizing current is B,
n is the number of turns of the coil, R1Radius of hollow solenoid without wound coil, R2Is the radius of the hollow solenoid with the wound coil, I is the current output by the adjustable constant current source, L is the length of the hollow solenoid, mu0For vacuum permeability, Δ R is one third of the thickness of the multilayer coil.
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| CN216595471U (en) * | 2021-12-10 | 2022-05-24 | 湖南常德牌水表制造有限公司 | Detection system of switch type Hall sensor |
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- 2021-12-10 CN CN202111505746.4A patent/CN114062991A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201993456U (en) * | 2010-12-21 | 2011-09-28 | 上海中科深江电动车辆有限公司 | Detection device for Hall current sensor |
| US20190317175A1 (en) * | 2018-04-13 | 2019-10-17 | Texas Instruments Incorporated | Calibration of Hall Device Sensitivity Using an Auxiliary Hall Device |
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