CN113155031B - Measuring device for coil offset of wireless power transmission system - Google Patents
Measuring device for coil offset of wireless power transmission system Download PDFInfo
- Publication number
- CN113155031B CN113155031B CN202011410996.5A CN202011410996A CN113155031B CN 113155031 B CN113155031 B CN 113155031B CN 202011410996 A CN202011410996 A CN 202011410996A CN 113155031 B CN113155031 B CN 113155031B
- Authority
- CN
- China
- Prior art keywords
- coil
- signal
- offset
- wireless power
- photosensitive sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 35
- 230000003750 conditioning effect Effects 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
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 measuring device for coil deviation of a wireless power transmission system.
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 needs to achieve the performance of high-efficiency 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 the factors interfered by the outside are small;
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 carries out wireless power transmission 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;
and 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, calculates the deviation value of the transmitting coil and the receiving coil 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 photoconductive effect and senses the illumination intensity under the condition of higher illumination intensity.
And the voltage-stabilizing and regulating module configured by the signal regulating 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 coil offset of the wireless power transmission system 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＝a 0 +a 1 cos(ωs)+b 1 sin(ωs)+a 2 cos(2ωs)+b 2 sin(2ωs) (1)
where D is the light intensity, s is the offset, a 0 、a 1 、a 2 、b 1 、b 2 Respectively, 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 coil offset measuring apparatus for a wireless power transmission system according to the present invention;
fig. 2 is a technical block diagram of a measuring device for coil offset of a wireless power transmission system according to the present invention;
fig. 3 is a schematic diagram of a theoretical model of the design of a measuring device for coil offset of a wireless power transmission system according to the present invention.
Fig. 4 is a block diagram schematically illustrating a coil offset measuring apparatus for a wireless power transmission system according to the present invention.
Fig. 5 is a configuration diagram of a power module of a measuring apparatus for coil offset in a wireless power transmission system according to the present invention.
Fig. 6 is a block diagram of a photosensitive sensor module of a measuring device for coil offset in a wireless power transmission system 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 coil offset of a wireless power transmission system according to the present invention.
Fig. 8 is a flowchart of a data processing subroutine stored in a one-chip processor of a measuring apparatus for coil offset in a wireless power transmission system according to the present invention.
Fig. 9(a) is a flowchart of a display subroutine stored in a single chip microcomputer chip of the device for measuring coil offset in a wireless power transmission system 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 device for measuring coil offset of a wireless power transmission system according to the present invention.
Fig. 9(c) is a flowchart of a data writing subroutine stored in a one-chip microcomputer chip of the device for measuring coil offset of a wireless power transmission system according to the present invention.
Fig. 10 is a flow chart of a communication subroutine stored in a single chip microcomputer chip of the device for measuring coil offset of a wireless power transmission system according to the present invention.
Fig. 11 is a view showing a measurement model of a measuring apparatus for coil offset in a wireless power transmission system 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 regulating module is an LDO power supply module; an ATK-4.3' TFTLCD capacitive touch screen module is selected and matched with the display 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 (3)
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 the transmitting coil is provided with a light source, the receiving coil is provided with a photosensitive sensor (5), the photosensitive sensor collects the illumination data of the receiving coil and generates a corresponding analog signal, 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 a numerical signal to an STM control module (7), the STM control module performs data analysis on the received digital signal and obtains deviation values of a transmitting coil and a receiving coil through calculation, the calculated deviation values are displayed on a human-computer interaction interface through a communication display module (8), and the STM control module calculates the deviation values of the transmitting coil and the receiving coil based on a deviation measurement calculation model under a CORDIC algorithm;
The use method of the measuring device for the coil offset of the wireless power transmission system comprises the following steps:
firstly, when a coil is found to be deviated, a photosensitive sensor is used for measuring an offset value, an ambient light intensity signal and an offset signal are used as input quantities, and the offset quantity is determined through discretization data processing;
performing Fourier fitting on the light intensity and the offset to obtain a fitting equation of the light intensity and the offset, wherein the fitting equation is used as a reference equation and is as follows:
D＝a 0 +a 1 cos(ωs)+b 1 sin(ωs)+a 2 cos(2ωs)+b 2 sin(2ωs) (1)
where D is the light intensity, s is the offset, a 0 、a 1 、a 2 、b 1 、b 2 Respectively, 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:
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 to sense the illumination intensity under different illumination.
3. The apparatus of claim 1, wherein the voltage regulator module of the signal conditioning module is configured to be an LDO power supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410996.5A CN113155031B (en) | 2020-12-03 | 2020-12-03 | Measuring device for coil offset of wireless power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410996.5A CN113155031B (en) | 2020-12-03 | 2020-12-03 | Measuring device for coil offset of wireless power transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113155031A CN113155031A (en) | 2021-07-23 |
| CN113155031B true CN113155031B (en) | 2022-07-29 |
Family
ID=76882462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011410996.5A Expired - Fee Related CN113155031B (en) | 2020-12-03 | 2020-12-03 | Measuring device for coil offset of wireless power transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113155031B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0855346A (en) * | 1994-08-12 | 1996-02-27 | Matsushita Electric Ind Co Ltd | Method for detecting movement of optical beam and optical disk reproducing device |
| CN201293636Y (en) * | 2008-11-04 | 2009-08-19 | 西安交通大学 | Photoelectric sensor device for local space measurement and position system |
| JP5517228B1 (en) * | 2013-04-16 | 2014-06-11 | 日本電信電話株式会社 | Method and system for evaluating crosstalk characteristics of multi-core optical fiber |
| CN104697474A (en) * | 2015-03-10 | 2015-06-10 | 无锡惠科电工高新技术有限公司 | Novel centering detecting device |
| CN105740123A (en) * | 2016-01-28 | 2016-07-06 | 浪潮电子信息产业股份有限公司 | Method for monitoring bending degree of board card in case |
| CN109217439A (en) * | 2018-11-16 | 2019-01-15 | 京东方科技集团股份有限公司 | Wireless charging device and charging system |
| CN109649194A (en) * | 2019-01-14 | 2019-04-19 | 深圳大学 | A kind of automobile wireless charging contraposition deviation detection device and method |
| CN110998243A (en) * | 2017-08-15 | 2020-04-10 | Ksr Ip控股有限责任公司 | System and method for correcting non-sinusoidal signals generated by non-circular coupler |
| CN111322982A (en) * | 2020-03-23 | 2020-06-23 | 四川中保维新科技发展有限公司 | Settlement displacement measuring method and device based on laser spots |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015113600A (en) * | 2013-12-10 | 2015-06-22 | 矢崎総業株式会社 | Parking support system and wireless power supply system |
| CN104092635B (en) * | 2014-07-21 | 2017-09-15 | 中国科学院微电子研究所 | Carrier frequency deviation estimating method, carrier compensation method and device |
-
2020
- 2020-12-03 CN CN202011410996.5A patent/CN113155031B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0855346A (en) * | 1994-08-12 | 1996-02-27 | Matsushita Electric Ind Co Ltd | Method for detecting movement of optical beam and optical disk reproducing device |
| CN201293636Y (en) * | 2008-11-04 | 2009-08-19 | 西安交通大学 | Photoelectric sensor device for local space measurement and position system |
| JP5517228B1 (en) * | 2013-04-16 | 2014-06-11 | 日本電信電話株式会社 | Method and system for evaluating crosstalk characteristics of multi-core optical fiber |
| CN104697474A (en) * | 2015-03-10 | 2015-06-10 | 无锡惠科电工高新技术有限公司 | Novel centering detecting device |
| CN105740123A (en) * | 2016-01-28 | 2016-07-06 | 浪潮电子信息产业股份有限公司 | Method for monitoring bending degree of board card in case |
| CN110998243A (en) * | 2017-08-15 | 2020-04-10 | Ksr Ip控股有限责任公司 | System and method for correcting non-sinusoidal signals generated by non-circular coupler |
| CN109217439A (en) * | 2018-11-16 | 2019-01-15 | 京东方科技集团股份有限公司 | Wireless charging device and charging system |
| CN109649194A (en) * | 2019-01-14 | 2019-04-19 | 深圳大学 | A kind of automobile wireless charging contraposition deviation detection device and method |
| CN111322982A (en) * | 2020-03-23 | 2020-06-23 | 四川中保维新科技发展有限公司 | Settlement displacement measuring method and device based on laser spots |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113155031A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1928540A (en) | Portable smart water quality conductive detection device | |
| CN109633255A (en) | Current measuring device and current measuring method based on current divider | |
| CN109884377A (en) | The hall signal measuring device and method of detection range automatic adjustment | |
| CN110568396A (en) | Installation type standard meter and system and method for calibration by using same | |
| CN111323741A (en) | Indirect access type direct current electric energy meter calibrating device and method | |
| CN110174548A (en) | A kind of measurement method, measuring device and the measuring system of long straight conductor current potential | |
| CN2919261Y (en) | AC current and voltage measuring circuit adopting AC sampling | |
| CN203405518U (en) | Data acquisition sensor system for intelligent transformer | |
| CN109490606A (en) | A kind of isolation voltage detection device | |
| CN113155031B (en) | Measuring device for coil offset of wireless power transmission system | |
| CN208968648U (en) | A kind of high-precision electronic claims | |
| CN213365069U (en) | Multifunctional meteorological data acquisition intelligent analysis device | |
| CN206130287U (en) | Non -contact valve positioner | |
| CN109238557A (en) | A kind of intelligent self-diagnosing formula pressure transmitter device | |
| CN2416506Y (en) | Differential pressure dynamic wind speed measuring apparatus | |
| CN108132444A (en) | Direct current ripple coefficient test device | |
| KR20120135663A (en) | A wind direction and speed measurement equipment using the piezo sensor | |
| CN109857099A (en) | A kind of magnetic tracking sensor and the method for sensing using the sensor | |
| CN215599532U (en) | Inductive displacement sensor signal processing device of usb interface | |
| CN210572474U (en) | Two-wire Hall type effective value current transmitter | |
| CN117742502B (en) | Dual-mode gesture recognition system and method based on capacitance and distance sensor | |
| CN209842046U (en) | Installation type standard meter and system for calibrating by using same | |
| CN2283829Y (en) | Intelligence magnetic means coating thickness measuring instrument | |
| CN204154375U (en) | Based on the electronic scale of electromagnetic induction | |
| CN214427509U (en) | Test measurement system embedded core hardware based on multiple communication interfaces |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220729 |