CN113155031A - Measuring device for deviation of wireless power transmission coil - Google Patents
Measuring device for deviation of wireless power transmission coil Download PDFInfo
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- CN113155031A CN113155031A CN202011410996.5A CN202011410996A CN113155031A CN 113155031 A CN113155031 A CN 113155031A CN 202011410996 A CN202011410996 A CN 202011410996A CN 113155031 A CN113155031 A CN 113155031A
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention discloses a measuring device for coil deflection of a wireless power transmission system, which structurally comprises a power supply and a load, wherein the power supply is connected with a transmitting coil, the load is connected with a receiving coil, the power supply transmits wireless power to the load through the transmitting coil and the receiving coil, a photosensitive sensor is arranged on the receiving coil of the measuring device for coil deflection, the photosensitive sensor collects illumination data of the transmitting coil and generates a corresponding analog signal, the signal output of the photosensitive sensor is connected with the signal input of a signal conditioning module, the analog signal generated by the photosensitive sensor is transmitted to the signal conditioning module, the signal conditioning module performs digital-to-analog conversion on the received analog signal to obtain a corresponding digital signal, and the signal conditioning module is provided with a voltage stabilization regulating module. The method has the advantages of effectively measuring the offset distance of the wireless power transmission coil to further realize efficient transmission of the system, along with simple operation and wide application range.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a device for measuring the deviation of a wireless power transmission coil.
Background
The essence of the work of the magnetic coupling resonance type wireless power transmission system is that two coils with the same resonance frequency realize energy transmission through mutual inductance; if the system is to achieve the performance of efficient transmission, the system needs to meet the position characteristics of parallel axes, concentric axes and the like; the laboratory research of the wireless energy transfer system is usually established on the basis of parallel coils, and is less influenced by external interference;
however, in practical application environments such as electric vehicles and the like, due to the influence of external factors, the problem of coil offset inevitably occurs in the magnetic coupling resonant wireless power transmission system, and the coil offset affects mutual inductance between two resonant frequency coils, so that the load charging voltage and the charging efficiency are affected; in order to solve the above technical problems, it is necessary to find a coil offset identification method, complete a coil offset degree detection design, perform system transmission characteristic analysis during coil offset, and propose improvement measures to improve the system design so as to improve the system transmission characteristic.
Disclosure of Invention
The invention aims to solve the problems and designs a device for measuring the offset of a wireless power transmission coil.
The wireless power transmission system comprises a power supply and a load, wherein the power supply is connected with a transmitting coil, the load is connected with a receiving coil, and the power supply transmits wireless power to the load through the transmitting coil and the receiving coil.
The transmitting coil is provided with a light source, the receiving coil is provided with a photosensitive sensor, the photosensitive sensor collects offset data of the transmitting coil and the receiving coil and reflects the offset data through illumination data to generate corresponding analog signals, the signal output of the photosensitive sensor is connected with the signal input of the signal conditioning module, the signal conditioning module performs digital-to-analog conversion on the received analog signals to obtain corresponding digital signals, and the signal conditioning module is provided with a voltage-stabilizing adjusting module;
the signal output of the signal conditioning module transmits the numerical signal to the STM control module, the STM control module performs data analysis on the received digital signal, obtains the deviation value of the transmitting coil and the receiving coil through calculation, and displays the calculated deviation value on a human-computer interaction interface through the communication display module.
The photosensitive sensor is a photoresistor which is an illumination sensor based on a photoconductive effect and senses the illumination intensity under the condition of high illumination intensity.
The voltage-stabilizing and regulating module configured by the signal conditioning module is an LDO power supply module.
And the STM control module calculates offset values of the transmitting coil and the receiving coil based on an angle measurement calculation model under a CORDIC algorithm.
Advantageous effects
The measuring device for the wireless power transmission coil offset, which is manufactured by the technical scheme of the invention, has the following advantages:
1. when the coil of the wireless electric energy transmission device generates transverse offset, the offset is measured by using the photosensitive sensor, the design of non-contact measurement is realized, and the offset is better measured. The operation is realized as follows: firstly, when a coil is found to be deviated, a photosensitive sensor is added for measuring the deviation, an ambient light intensity signal and a deviation signal are used as input quantities, and the magnitude of the deviation is determined through discretization data processing; and performing Fourier fitting on the light intensity and the offset to obtain a fitting equation of the light intensity and the offset, and taking the fitting equation as a reference equation. The fitting equation is:
D＝a0+a1 cos(ωs)+b1 sin(ωs)+a2 cos(2ωs)+b2 sin(2ωs) (1)
where D is the light intensity, s is the offset, a0、a1、a2、b1、b2Respectively, D is a reference light intensity, x is an ambient light intensity at the time of measurement, and y is a measured light intensity, and a formula which is reduced to the reference light intensity is calculated:
the method can well perform non-contact offset measurement on different ambient light intensities and different vehicles.
2. Compared with the existing measuring method, the wireless power transmission coil deviation measuring device of the invention has the following substantial differences: firstly, a photosensitive sensor is adopted to have high measurement sensitivity and no contact, a control module has high response speed and high accuracy, the maximum error between an actual measurement value and a theoretical value is 10 percent, and the error between the measurement value and an actual deviation value can be small by selecting a CORDIC algorithm; and secondly, in the measurement process, data under certain light intensity can be implanted at any time, and other data are obtained by taking a Fourier fitting equation as a reference.
3. The device is simple in design, simple in operation, not easy to be interfered by an external magnetic field, low in cost, suitable for various wireless electric energy transmission devices and capable of testing the offset measurement of the wireless charging device of the electric automobile;
4. the device has the advantages of accurate information acquisition, low cost of the selected photosensitive sensor, convenient installation, easy embedding, high response speed and non-contact.
Drawings
Fig. 1 is a block diagram illustrating a connection structure of a measuring apparatus for wireless power transmission coil offset according to the present invention;
FIG. 2 is a schematic block diagram of a measuring device for wireless power transmission coil offset according to the present invention;
fig. 3 is a schematic diagram of a theoretical model of the design of a measuring device for the wireless power transmission coil offset according to the present invention.
Fig. 4 is a block diagram schematically illustrating a configuration of a measuring apparatus for wireless power transmission coil offset according to the present invention.
Fig. 5 is a configuration diagram of a power module of a measuring apparatus for wireless power transmission coil offset according to the present invention.
Fig. 6 is a block diagram of a photosensitive sensor module of a measuring device for wireless power transmission coil offset according to the present invention.
Fig. 7 is a flowchart of a general operating program stored in a single chip of a measuring device for wireless power transmission coil offset according to the present invention.
Fig. 8 is a flowchart of a data processing subroutine stored in a one-chip processor chip of a measuring apparatus for wireless power transmission coil offset according to the present invention.
Fig. 9(a) is a flowchart of a display subroutine stored in a one-chip microcomputer chip of the apparatus for measuring a deviation of a wireless power transmission coil according to the present invention.
Fig. 9(b) is a flowchart of a write command or address subroutine stored in a single chip microcomputer chip of the apparatus for measuring an offset of a wireless power transmission coil according to the present invention.
Fig. 9(c) is a flowchart of a write data subroutine stored in a one-chip microcomputer chip of the apparatus for measuring a deviation of a wireless power transmission coil according to the present invention.
Fig. 10 is a flowchart of a communication subroutine stored in a single chip microcomputer chip of the apparatus for measuring an offset of a wireless power transmission coil according to the present invention.
Fig. 11 is a view showing a measurement model of a measuring apparatus for wireless power transmission coil offset according to the present invention;
FIG. 12 is a graph of a fit according to the present invention;
FIG. 13 is a table of data for the present invention for reducing real-side values to reference values based on offset.
In the figure, 1, power supply; 2. a load; 3. a transmitting coil; 4. a receiving coil; 5. a photosensitive sensor; 6. a voltage stabilization adjustment module; 7. an STM control module; 8. a communication display module; 9. and a signal conditioning module.
Detailed Description
The invention is described in detail below with reference to the drawings, as shown in FIGS. 1-13;
the application is characterized in that a light source is configured on a transmitting coil, a photosensitive sensor is configured on a receiving coil, the photosensitive sensor collects illumination data of the transmitting coil and generates corresponding analog signals, the signal output of the photosensitive sensor is connected with the signal input of a signal conditioning module 9, the analog signals generated by the photosensitive sensor are transmitted to the signal conditioning module, the signal conditioning module performs digital-to-analog conversion on the received analog signals to obtain corresponding digital signals, and the signal conditioning module is configured with a voltage stabilization conditioning module 6;
the invention of this application still lies in, signal output at signal conditioning module gives STM control module 7 with numerical signal transmission, STM control module carries out data analysis and obtains transmitting coil and receiving coil's deviant through calculating the digital signal that receives to the deviant that will calculate and show on man-machine interface through communication display module 8 that obtains.
The electronic device adopted by the technical scheme comprises:
the STM32F103 control module, the photosensitive chip and the LDO power supply module;
the electronic devices are all existing products, the technical scheme of the application has no special requirements and changes on the structures of the electronic devices, and the electronic devices all belong to conventional electronic equipment;
in the implementation process of the technical scheme, a person in the art needs to connect all the electrical components and the power supplies adapted to the electrical components in the present application through wires, and should select an appropriate controller according to actual conditions to meet control requirements, and specific connection and control sequence.
The invention also provides a photosensitive sensor, which is characterized in that the photosensitive sensor adopts a photoresistor, the photosensitivity is a photosensitive sensor based on a photoconductive effect, and the light intensity is sensed under the condition of higher light intensity; the voltage-stabilizing and regulating module configured by the signal conditioning module is an LDO power supply module; the display module is matched with an ATK-4.3' TFTLCD capacitive touch screen module; the STM control module calculates offset values of the transmitting coil and the receiving coil based on a measurement calculation model under a CORDIC algorithm;
the measuring method adopts the light intensity reflecting coil of the selected photosensitive sensor to perform offset measurement, performs Fourier fitting on a certain light intensity result to obtain the corresponding relation between the light intensity and the offset, and reduces the offset under different light intensity environments so as to calculate the actual offset under different environments.
In the implementation process of the technical scheme, when the transmitting coil and the receiving coil deviate, the illumination intensity at different positions changes, a light source is applied to the transmitting coil, a photosensitive sensor is adopted in the receiving coil, illumination change information is collected, a voltage change signal is output, the collected voltage analog signal is converted into a digital signal through a signal conditioning module and is transmitted to an STM controller for data processing calculation, and then the deviation of the transmitting coil and the receiving coil is obtained;
the photosensitive sensor outputs a voltage signal, the STM32F103 module processes the voltage signal, digital-to-analog conversion is carried out on the processed signal, a photosensitive measurement calculation model based on a CORDIC algorithm is established, an offset identification model based on illumination change under coil offset is established, and then the offset degree of the coil is identified.
Calculation example:
actually measuring in a laboratory environment, wherein the coil structure is a circular coil, the radiuses of a receiving coil and a transmitting coil are both 20cm, the central distance between the transmitting coil and the receiving coil is 15cm, the transverse offset range of the receiving coil is 0-20cm, the system resonance frequency is 85kHz, measuring the offset under the environment light intensity of 40cd, fitting to obtain a reference curve, and performing reduction, wherein the maximum error between an actually measured value and a theoretical value is 10%, as shown in FIG. 12.
The formula is obtained according to the measured values:
D＝66.44+11.33cos(0.173s)+5.25sin(0.173s)+1.05cos(0.346s)-5.03sin(0.346s) (3)
the real side value is reduced to the reference value according to this formula, as shown in fig. 13.
It is noted that, herein, 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. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (4)
1. A measuring device for coil offset of a wireless power transfer system, the wireless power transfer system comprising a power source (1) and a load (2), the power supply is connected with the transmitting coil (3), the load is connected with the receiving coil (4), the power supply carries out wireless power transmission to the load through the transmitting coil and the receiving coil, characterized in that a photosensitive sensor (5) is arranged on each of the transmitting coil and the receiving coil, the photosensitive sensor collects the illumination data of the transmitting coil and the receiving coil and generates corresponding analog signals, the signal output of the photosensitive sensor is connected with the signal input of the signal conditioning module (9), the analog signal generated by the photosensitive sensor is transmitted to a signal conditioning module, the signal conditioning module performs digital-to-analog conversion on the received analog signal to obtain a corresponding digital signal, and the signal conditioning module is provided with a voltage-stabilizing regulating module (6);
the signal output of the signal conditioning module transmits the numerical value signal to an STM control module (7), the STM control module performs data analysis on the received digital signal, obtains the deviation value of the transmitting coil and the receiving coil through calculation, and displays the calculated deviation value on a human-computer interaction interface through a communication display module (8).
2. The device as claimed in claim 1, wherein the photo sensor is a photo resistor, and the photo resistor is based on resistance effect under different illumination intensity, and senses the illumination intensity under different illumination.
3. The apparatus of claim 1, wherein the voltage regulation and regulation module of the signal conditioning module is an LDO power supply module.
4. The device for measuring the offset of the wireless power transmission coil according to claim 1, wherein the STM control module calculates the offset values of the transmitting coil and the receiving coil based on an offset measurement calculation model under a CORD IC algorithm.
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| CN202011410996.5A CN113155031B (en) | 2020-12-03 | 2020-12-03 | Measuring device for coil offset of wireless power transmission system |
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| CN202011410996.5A CN113155031B (en) | 2020-12-03 | 2020-12-03 | Measuring device for coil offset of wireless power transmission system |
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