CN115201576A - Novel method and system for detecting equivalent inductance with high precision - Google Patents
Novel method and system for detecting equivalent inductance with high precision Download PDFInfo
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- CN115201576A CN115201576A CN202210819687.6A CN202210819687A CN115201576A CN 115201576 A CN115201576 A CN 115201576A CN 202210819687 A CN202210819687 A CN 202210819687A CN 115201576 A CN115201576 A CN 115201576A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001574 biopsy Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 12
- 239000002184 metal Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
The invention relates to the technical field of sensors, in particular to a novel method and a system for detecting equivalent inductance with high precision, wherein a detection circuit is formed by connecting a resistor, a constant current source circuit and a planar coil inductor in parallel, the planar coil inductor is printed on a PCB (printed circuit board), the coil routing of the planar coil inductor enables the direction of a magnetic field generated by current to be consistent, a high-precision timer is connected with the planar coil inductor through a selection switch, the high-precision timer controls the selection switch through CCR1A, and the high-precision timer controls the detection circuit through CCR 2A.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a novel method and a system for detecting equivalent inductance with high precision.
Background
The angular position sensor can detect the rotation angular displacement of a detected target, and is mainly used in flow meters, industrial machine tools and robot industries. The metal displacement sensor is mainly applied to the industries of industrial machine tools, robots and industrial Internet of things.
At present, angular displacement and displacement sensors in the industry mainly use a grating, and a detection method generally detects the amplitude of LC oscillation or the change of frequency, but the amplitude change is difficult to detect in the process of micro signals and micro power consumption, and the frequency detection has weak anti-interference performance and is greatly influenced by temperature drift.
Based on the reasons, the invention designs a novel high-precision equivalent inductance detection method and system, detects the equivalent inductance value of the output signal of the induction coil, is suitable for the working environment of micro power consumption and micro signals, can be applied to sensor products of angular displacement and metal displacement, is convenient to produce, and has high precision and strong anti-interference performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel high-precision equivalent inductance detection method and system, which are used for detecting the equivalent inductance value of the output signal of an induction coil, are suitable for the working environments of micro power consumption and micro signals, can be applied to sensor products of angular displacement and metal displacement, and are convenient to produce, high in precision and strong in anti-interference performance.
In order to achieve the purpose, the invention provides a novel high-precision detection equivalent inductance system which comprises a PCB (printed circuit board), a planar coil inductor, a detection circuit and a high-precision timer, wherein the detection circuit is formed by connecting a resistor, a constant current source circuit and the planar coil inductor in parallel, the planar coil inductor is printed on the PCB, the coil routing of the planar coil inductor enables the direction of a magnetic field generated by current to be consistent, the high-precision timer is connected with the planar coil inductor through a selection switch, the high-precision timer controls the selection switch through CCR1A, and the high-precision timer controls the detection circuit through CCR 2A.
A novel high-precision equivalent inductance detection method comprises the following steps:
s1, at the time of T0, connecting a selection switch with a constant current source circuit, starting a high-precision timer to perform timing work, discharging electricity to a planar coil inductor by the constant current source circuit, and enabling the current passing through the planar coil inductor to reach a stable value;
s2, at the moment of T1, a high-precision timer counts time, the timer CCR1A is enabled, and a selection switch is connected with a resistor;
s3, at the time of T2, a high-precision timer counts, a timer CCR2A is enabled, and the biopsy circuit is activated to start working;
s4, the detection circuit calculates an equivalent inductance value by detecting the voltage at two ends of the resistor at the moment T2;
the specific algorithm of S4 is as follows:
the initial value of the inductor current is: i all right angle l (0 + )＝i l (0 - )＝I 0 ；
Circuit current:
resistance voltage:
I 0 is the initial current of the constant current source; u shape R Is a damping function with stable initial amplitude, R is a resistance value, U R And the time T = T2-T1 is obtained by a high-precision timer, and the equivalent inductance L value is calculated through formula deformation.
The detection circuit is detecting U R When the circuit is used, a first-order differential circuit can be added in the detection circuit to detect U R The rate of change of (c).
Detection circuit passes detection U R To a certain fixed voltage U T Calculating the L value and U value of the equivalent inductance through the time window T The value ranges from 0 to RI 0 In the meantime.
Compared with the prior art, the detection circuit is arranged on the planar coil inductor, the selection switch is controlled by the high-precision timer, the voltage values at two ends of the resistor can be effectively measured, the corresponding equivalent inductance value can be obtained, the detection of the equivalent inductance value under the working environment of micro power consumption and micro signals is realized, the detection circuit can be applied to sensor products of angular displacement and metal displacement, the production is convenient, the precision is high, and the anti-interference performance is strong.
Drawings
FIG. 1 is a schematic diagram of an exponential circuit of the algorithm of the present invention.
Fig. 2 is a schematic diagram of the discharge of the planar coil inductance to the resistance.
FIG. 3 is a diagram illustrating a detection state according to the present invention.
FIG. 4 is a schematic diagram of a first order differential circuit added to the detection circuit of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Referring to fig. 1-4, the invention provides a novel high-precision equivalent inductance detection method and system, which comprises a Printed Circuit Board (PCB), a planar coil inductor, a detection circuit and a high-precision timer, wherein the detection circuit is formed by connecting a resistor, a constant current source circuit and the planar coil inductor in parallel, the planar coil inductor is printed on the PCB, the coil routing of the planar coil inductor enables the directions of magnetic fields generated by current to be consistent, the high-precision timer is connected with the planar coil inductor through a selection switch, the high-precision timer controls the selection switch through CCR1A, and the high-precision timer controls the detection circuit through CCR 2A.
A novel high-precision equivalent inductance detection method comprises the following steps:
s1, at the time of T0, connecting a selection switch with a constant current source circuit, starting a high-precision timer to perform timing work, discharging electricity to a planar coil inductor by the constant current source circuit, and enabling the current passing through the planar coil inductor to reach a stable value;
s2, at the moment of T1, a high-precision timer counts, the timer CCR1A is enabled, and a selection switch is connected with a resistor, so that the planar coil inductor with initial stable current discharges to the resistor;
s3, at the time of T2, a high-precision timer counts, the timer CCR2A is enabled, and the biopsy circuit is activated to start working;
s4, the detection circuit calculates an equivalent inductance value by detecting the voltage at two ends of the resistor at the time of T2;
the specific algorithm of S4 is as follows:
the initial value of the inductor current is: i.e. i l (0 + )＝i l (0 - )＝I 0 ；
Circuit current:
resistance voltage:
I 0 is the initial current of the constant current source; u shape R Is a damping function with stable initial amplitude, R is a resistance value, U R And the time T = T2-T1 is obtained by a high-precision timer, and the equivalent inductance L value is calculated through formula deformation.
By first order differentiating circuit, U R The change rate can amplify the signal by at least ten thousand times, thereby facilitating the detection of weak signals, improving the detection precision and the interference resistance.
Detection circuit detects U R To a certain fixed voltage U T Calculating the L value and U value of the equivalent inductance through the time window T The value ranges from 0 to RI 0 In the meantime.
Example (b):
referring to fig. 1 to 4, the present invention provides a novel method and system for detecting equivalent inductance with high precision:
when the detected metal object is far away from the induction coil, namely the inductance of the planar coil, at the time of T0, the selection switch C is connected with A, and simultaneously, the high-precision timer is started to time, the constant current source circuit discharges to the inductance of the planar coil at the time, and the current passing through the inductance of the planar coil reaches a stable value;
when the high-precision timer times T1, enabling a timer CCR1A, disconnecting a selector switch C from the switch A and connecting the selector switch C with the switch A and the switch B, and discharging a planar coil inductor with initial stable current to a resistor; (ii) a
The high-precision timer counts the time T2, the timer CCR2A is enabled, and the detection circuit is activated to start working; the detection circuit detects the voltage U at two ends of the resistor at the moment of T2 R 11。
When a detected metal object approaches an induction coil, namely a planar coil inductor, at the time of T0, a selection switch C is connected with A, and a high-precision timer is started to work for timing, at the time, a constant current source circuit discharges to the planar coil inductor, and the current passing through the planar coil inductor reaches a stable value;
when the high-precision timer times T1, enabling a timer CCR1A, disconnecting a selector switch C from the switch A and connecting the selector switch C with the switch A and the switch B, and discharging a planar coil inductor with initial stable current to a resistor; (ii) a
When the high-precision timer times T2, enabling the timer CCR2A, and exciting the detection circuit to start working; the detection circuit detects the voltage U at two ends of the resistor at the moment of T2 R 22。
U R 11 and U R The 22 value must be different, and U R 11 and U R 22 are caused by the change in the equivalent inductance value due to the moving away and close of the metal object.
The above are only preferred embodiments of the present invention, and are only used to help understanding the method and the core idea of the present application, the scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
The invention integrally solves the problems that the detection is difficult, the anti-interference performance of frequency detection is weak and the influence of temperature drift is large in the micro-signal and micro-power consumption in the prior art, the voltage values at two ends of the resistor can be effectively measured and the corresponding equivalent inductance value can be obtained by arranging the detection circuit on the planar coil inductor and controlling the selector switch by the high-precision timer, and the invention can be applied to the sensor products of angular displacement and metal displacement and is convenient for production, high in accuracy and strong in anti-interference performance.
Claims (5)
1. The utility model provides a novel high accuracy detects equivalent inductance system, its characterized in that comprises PCB circuit board, planar coil inductance, detection circuitry and high accuracy timer, detection circuitry comprises resistance, constant current source circuit and planar coil inductance parallel connection, the planar coil inductance printing is in on the PCB circuit board, the coil of planar coil inductance is walked the line and is made the magnetic field direction that the electric current produced unanimous, the high accuracy timer pass through the select switch with the planar coil inductance is connected, the high accuracy timer passes through CCR1A control select switch, the high accuracy timer passes through CCR2A control detection circuitry.
2. A novel method for detecting equivalent inductance with high precision according to the system of claim 1, comprising the following steps:
s1, at the time of T0, connecting a selection switch with a constant current source circuit, starting a high-precision timer to perform timing work, discharging electricity to a planar coil inductor by the constant current source circuit, and enabling the current passing through the planar coil inductor to reach a stable value;
s2, at the moment of T1, a high-precision timer counts time, the timer CCR1A is enabled, and a selection switch is connected with a resistor;
s3, at the time of T2, a high-precision timer counts, the timer CCR2A is enabled, and the biopsy circuit is activated to start working;
and S4, the detection circuit calculates the equivalent inductance value by detecting the voltage at two ends of the resistor at the moment T2.
3. The novel high-precision equivalent inductance detection method according to claim 2, wherein the specific algorithm of S4 is as follows:
the initial value of the inductor current is: i all right angle l (0 + )＝i l (0 - )＝I 0 ；
Circuit current:
resistance voltage:
said I 0 Is the initial current of the constant current source; the U is R Is a decay function with stable initial amplitude, where R is the resistance value, U R And obtaining the time T = T2-T1 by a high-precision timer, and calculating the equivalent inductance L value by formula deformation.
4. The method as claimed in claim 2, wherein the detection circuit detects U R When detecting U, the first-order differential circuit can be added in the detection circuit to detect U R The rate of change of (c).
5. The method as claimed in claim 2, wherein the detection circuit detects the U-component inductance by detecting the U-component inductance R To a fixed voltage U T To calculate the equivalent inductance L value, said U T The value ranges from 0 to RI 0 In the meantime.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819687.6A CN115201576A (en) | 2022-07-13 | 2022-07-13 | Novel method and system for detecting equivalent inductance with high precision |
| PCT/CN2023/103816 WO2024012216A1 (en) | 2022-07-13 | 2023-06-29 | New high-precision equivalent-inductance measurement method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210819687.6A CN115201576A (en) | 2022-07-13 | 2022-07-13 | Novel method and system for detecting equivalent inductance with high precision |
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| CN115201576A true CN115201576A (en) | 2022-10-18 |
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| CN202210819687.6A Pending CN115201576A (en) | 2022-07-13 | 2022-07-13 | Novel method and system for detecting equivalent inductance with high precision |
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| WO (1) | WO2024012216A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024012216A1 (en) * | 2022-07-13 | 2024-01-18 | 王元西 | New high-precision equivalent-inductance measurement method and system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3343885C2 (en) * | 1983-04-21 | 1996-12-12 | Wabco Gmbh | Inductive sensor |
| DE3807015A1 (en) * | 1987-04-29 | 1988-11-10 | Wabco Westinghouse Fahrzeug | METHOD AND CIRCUIT FOR MEASURING AN INDUCTIVITY |
| CN105387796B (en) * | 2015-12-07 | 2017-12-22 | 贵州新安航空机械有限责任公司 | The detection circuit and its detection method of a kind of inductive displacement transducer |
| US10444916B2 (en) * | 2017-03-10 | 2019-10-15 | Cypress Semiconductor Corporation | Combined inductive sensing and capacitive sensing |
| CN107526033B (en) * | 2017-09-30 | 2023-09-08 | 衢州学院 | High-precision switch type inductance tester |
| US11561249B2 (en) * | 2020-12-17 | 2023-01-24 | Cypress Semiconductor Corporation | Inductive sensing methods, devices and systems |
| CN114018144A (en) * | 2021-10-28 | 2022-02-08 | 上海隐冠半导体技术有限公司 | Sensor detection circuit and sensor detection method |
| CN114440753B (en) * | 2022-02-24 | 2022-11-22 | 电子科技大学 | Non-contact displacement measuring device based on eddy current principle |
| CN115201576A (en) * | 2022-07-13 | 2022-10-18 | 王元西 | Novel method and system for detecting equivalent inductance with high precision |
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2022
- 2022-07-13 CN CN202210819687.6A patent/CN115201576A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024012216A1 (en) * | 2022-07-13 | 2024-01-18 | 王元西 | New high-precision equivalent-inductance measurement method and system |
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Effective date of registration: 20231218 Address after: 215634, 416A, Building B, Science and Technology Entrepreneurship Park, Zhangjiagang Free Trade Zone, Suzhou City, Jiangsu Province Applicant after: Suzhou Ranmin Sensing Technology Co.,Ltd. Address before: 201199 room 1001, No. 40, Lane 3355, Chunshen Road, Minhang District, Shanghai Applicant before: Wang Yuanxi |