CN111007342A - Method for realizing measurement processing of wireless power charging transmission efficiency for handheld instrument based on computer software - Google Patents
Method for realizing measurement processing of wireless power charging transmission efficiency for handheld instrument based on computer software Download PDFInfo
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- CN111007342A CN111007342A CN201911326218.5A CN201911326218A CN111007342A CN 111007342 A CN111007342 A CN 111007342A CN 201911326218 A CN201911326218 A CN 201911326218A CN 111007342 A CN111007342 A CN 111007342A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a method for realizing wireless power charging transmission efficiency measurement processing aiming at a handheld instrument based on computer software, which comprises the following steps: calculating the mutual inductance coefficient between two semicircles of the track type coils TX and RX according to a Newman formula; calculating a mutual inductance between a semicircular portion of the track-type coil TX and a rectangular portion of the RX coil; calculating a mutual inductance between a rectangular portion of the racetrack coil TX and a rectangular portion of the RX coil; calculating a mutual inductance coefficient between a semicircular part of the track type coil TX and the RX coil, and correcting a calculation result according to the angular dislocation between the coils; calculating the mutual inductance coefficient between the whole TX coil and the whole RX coil; the transmission efficiency is further calculated from the mutual inductance between the TX coil and the RX coil and the forward transmission gain. By adopting the method for realizing the measurement and processing of the wireless power charging transmission efficiency aiming at the handheld instrument based on the computer software, the transmission efficiency calculation influence factors are few, the error is small, and the method has a larger application range.
Description
Technical Field
The invention relates to the field of instruments, in particular to the field of energy transmission of instruments, and specifically relates to a method for realizing wireless power charging transmission efficiency measurement processing for a handheld instrument based on computer software.
Background
Wireless energyThe transmission or wireless power transmission technology is based on a power supply and a load, and energy is transmitted only in an electromagnetic induction and coupling mode without any transmission line between the power supply and the load. Factors such as distance, frequency, coil model, etc. all affect the transmission efficiency. Wireless power transfer has been implemented in the field of cell phones to date, but has not been addressed in handheld meters. Generally, when the mutual inductance M between two coils is obtained, Greenhouse, Newmann's formula is adopted
And (4) equation calculation. The transmission efficiency between the coils is calculated, either using Pout/Pin or by calculating its S21 parameter, and then the transmission efficiency is calculated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for realizing the measurement and processing of the wireless power charging transmission efficiency of a handheld instrument based on computer software, which has the advantages of small error, few influence factors and high accuracy.
In order to achieve the above object, the method for implementing wireless power charging transmission efficiency measurement processing for a handheld meter based on computer software of the present invention comprises:
the method for realizing the measurement and processing of the wireless power charging transmission efficiency aiming at the handheld instrument based on the computer software is mainly characterized by comprising the following steps:
(1) initializing a computer software system;
(2) the system obtains the size parameters of a TX coil and an RX coil of a corresponding handheld instrument according to the input information of a user;
(3) the system calculates the mutual inductance coefficient between the TX coil and the RX coil of the runway type coil by calling calculation software according to the obtained size parameters of the TX coil and the RX coil of the handheld instrument;
(4) the system further calculates transmission efficiency by calling calculation software according to mutual inductance between the TX coil and the RX coil and forward transmission gain, and generates and exhibits a profile of an electromagnetic field by calling calculation software.
Preferably, the step (3) specifically includes the following steps:
(3.1) calculating a mutual inductance between two semicircles of the track-type coils TX and RX according to the newmann formula;
(3.2) calculating a mutual inductance between a semicircular portion of the track type coil TX and a rectangular portion of the RX coil;
(3.3) calculating a mutual inductance between the rectangular portion of the track type coil TX and the rectangular portion of the RX coil;
(3.4) calculating the mutual inductance coefficient between the semicircular part of the track type coil TX and the RX coil, and correcting the calculation result according to the angular dislocation between the coils;
(3.5) calculating the mutual inductance between the whole TX coil and the whole RX coil.
Preferably, the step (3.4) of correcting the mutual inductance according to the angular displacement between the coils is specifically:
calculating a modified mutual inductance calculation according to the following formula:
Ma1＝Ma1a2+Ma1b2+Ma1c2+Ma1d2；
wherein l1And l3Denotes the semi-circle radii of the TX and RX coils, 2l respectively2And 2l4The lengths θ representing the TX and RX coils, respectively, are the angular difference between the two coils, Ma1For the half-circle part of the coil TX after correction and RXThe mutual inductance, phi,
respectively TX coil, RX coil cartesian coordinates are converted into a representation of cylindrical coordinates.
Preferably, the computing software is MATLAB computing software.
The method for realizing the measurement processing of the wireless power charging transmission efficiency aiming at the handheld instrument based on the computer software skillfully overcomes the technical blank defect that the handheld instrument does not relate to the wireless power transmission, considers different coil model designs and possible conditions and influence factors, adopts a novel calculation formula to calculate the transmission efficiency, and has the advantages of few influence factors, small error and wider application range.
Drawings
Fig. 1 is a schematic diagram of a conventional racetrack-type coil of the prior art.
Fig. 2 is a graph showing simulation results of transmission efficiency and distance of a conventional racetrack coil in the prior art.
Fig. 3 is a flowchart of a method for implementing a wireless power charging transmission efficiency measurement process for a handheld meter based on computer software according to the present invention.
Fig. 4 is a schematic diagram of a coil model in the presence of an angular deviation according to the method for implementing measurement processing of wireless power charging transmission efficiency for a handheld meter based on computer software.
Fig. 5 is a diagram showing simulation results of transmission efficiency and angle in the presence of an angle deviation in the method for measuring and processing wireless power charging transmission efficiency for a handheld meter based on computer software according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The invention discloses a method for realizing wireless power charging transmission efficiency measurement processing aiming at a handheld instrument based on computer software, which comprises the following steps:
(1) initializing a computer software system;
(2) the system obtains the size parameters of a TX coil and an RX coil of a corresponding handheld instrument according to the input information of a user;
(3) the system calculates the mutual inductance coefficient between the TX coil and the RX coil of the runway type coil by calling calculation software according to the obtained size parameters of the TX coil and the RX coil of the handheld instrument; the computing software is MATLAB computing software, which comprises the following steps:
(3.1) calculating a mutual inductance between two semicircles of the track-type coils TX and RX according to the newmann formula;
(3.2) calculating a mutual inductance between a semicircular portion of the track type coil TX and a rectangular portion of the RX coil;
(3.3) calculating a mutual inductance between the rectangular portion of the track type coil TX and the rectangular portion of the RX coil;
(3.4) calculating the mutual inductance coefficient between the semicircular part of the track type coil TX and the RX coil, and correcting the calculation result according to the angular dislocation between the coils;
(3.5) calculating the mutual inductance coefficient between the whole TX coil and the whole RX coil;
(4) the system further calculates transmission efficiency by calling calculation software according to mutual inductance between the TX coil and the RX coil and forward transmission gain, and generates and exhibits a profile of an electromagnetic field by calling calculation software.
In a preferred embodiment of the present invention, the step (3.4) of correcting the mutual inductance according to the angular displacement between the coils is specifically:
calculating a modified mutual inductance calculation according to the following formula:
Ma1＝Ma1a2+Ma1b2+Ma1c2+Ma1d2；
wherein l1And l3Denotes the semi-circle radii of the TX and RX coils, 2l respectively2And 2l4The lengths θ representing the TX and RX coils, respectively, are the angular difference between the two coils, Ma1The mutual inductance between the modified semicircular portion of coil TX and the RX coil, phi,
the TX coil, RX coil cartesian coordinates are converted to a representation of cylindrical coordinates, wherein a set of transformation matrices is as follows:
in the embodiment of the present invention, the transmission efficiency between the coils can be calculated by calculating the mutual inductance of the racetrack coil and the angular misalignment (angle misalignment) between the two coils, and by using the mutual inductance M.
The specific process is as follows:
1. according to a Newmann's formula, the mutual inductance coefficient between two semicircles of the track type coil TX and RX can be obtained;
2. according to a formula, the mutual inductance coefficient of the TX semicircle and the RX coil rectangular part of the runway type coil is obtained;
3. according to a formula, the mutual inductance coefficient of the rectangular parts of the TX and RX coils of the runway coil is obtained;
4. the invention only lists the mutual inductance coefficient between the TX semicircular part of the coil and the RX coil, and the mutual inductance coefficient is as follows:
Ma1＝Ma1a2+Ma1b2+Ma1c2+Ma1d2；
5. in practice, there will be an angle mismatch, wherein the formula appearing in step 4 will be modified as follows:
Ma1＝Ma1a2+Ma1b2+Ma1c2+Ma1d2；
6. similarly, the mutual inductance between the whole TX coil and RX coil can be found according to the above method;
7. knowing the relationship between the mutual inductance and S21, and the relationship between S21 and transmission efficiency, the transmission efficiency can be further improved.
FIG. 3 is a flow chart of the method of the present invention, in which
The mutual inductance between the coil parts is M, and the mutual inductance between the whole coils is M. Fig. 4 and 5 show simulation results of the embodiment of the present invention.
The method for realizing the measurement processing of the wireless power charging transmission efficiency of the handheld instrument based on the computer software skillfully overcomes the technical blank defect that the handheld instrument does not relate to wireless power transmission, and considers different coil model designs and possible conditions and influence factors.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (4)
1. A method for realizing wireless power charging transmission efficiency measurement processing for a handheld instrument based on computer software is characterized by comprising the following steps:
(1) initializing a computer software system;
(2) the system obtains the size parameters of a TX coil and an RX coil of a corresponding handheld instrument according to the input information of a user;
(3) the system calculates the mutual inductance coefficient between the TX coil and the RX coil of the runway type coil by calling calculation software according to the obtained size parameters of the TX coil and the RX coil of the handheld instrument;
(4) the system further calculates transmission efficiency by calling calculation software according to mutual inductance between the TX coil and the RX coil and forward transmission gain, and generates and exhibits a profile of an electromagnetic field by calling calculation software.
2. The method for realizing the wireless power charging transmission efficiency measurement processing for the handheld meter based on the computer software according to claim 1, wherein the step (3) specifically comprises the following steps:
(3.1) calculating a mutual inductance between two semicircles of the track-type coils TX and RX according to the newmann formula;
(3.2) calculating a mutual inductance between a semicircular portion of the track type coil TX and a rectangular portion of the RX coil;
(3.3) calculating a mutual inductance between the rectangular portion of the track type coil TX and the rectangular portion of the RX coil;
(3.4) calculating the mutual inductance coefficient between the semicircular part of the track type coil TX and the RX coil, and correcting the calculation result according to the angular dislocation between the coils;
(3.5) calculating the mutual inductance between the whole TX coil and the whole RX coil.
3. The method for realizing measurement processing of wireless power charging transmission efficiency for a handheld instrument based on computer software according to claim 2, wherein the step (3.4) of correcting the mutual inductance according to the angular misalignment between the coils is specifically:
calculating a modified mutual inductance calculation according to the following formula:
Ma1＝Ma1a2+Ma1b2+Ma1c2+Ma1d2；
wherein l1And l3Denotes the semi-circle radii of the TX and RX coils, 2l respectively2And 2l4The lengths θ representing the TX and RX coils, respectively, are the angular difference between the two coils, Ma1The mutual inductance between the modified semicircular portion of coil TX and the RX coil, phi,
respectively TX coil, RX coil cartesian coordinates are converted into a representation of cylindrical coordinates.
4. The method for realizing wireless power charging transmission efficiency measurement processing for a handheld meter based on computer software according to any one of claims 1 to 3, wherein the computing software is MATLAB computing software.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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