CN113077973B - 3S loose coupling transformer for wireless power transmission and parameter determination method - Google Patents
3S loose coupling transformer for wireless power transmission and parameter determination method Download PDFInfo
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- CN113077973B CN113077973B CN202110291321.1A CN202110291321A CN113077973B CN 113077973 B CN113077973 B CN 113077973B CN 202110291321 A CN202110291321 A CN 202110291321A CN 113077973 B CN113077973 B CN 113077973B
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Abstract
A3S loose coupling transformer for wireless power transmission and a parameter determination method belong to the technical field of wireless power transmission, and particularly relate to a loose coupling transformer. The primary side coupling mechanism and the secondary side coupling mechanism are arranged oppositely; the primary side coupling mechanism is positioned at the lower side of the secondary side coupling mechanism; the primary side coupling mechanism comprises a primary side ferrite magnetic core, a coil A and two coils B, wherein the coil A is attached to the upper surface of the ferrite magnetic core; the two coils B are respectively and independently wound into rectangular rings, the two coils B are attached to two opposite corners of the coil A, and the coil C of the secondary side coupling mechanism is attached to the lower surface of the ferrite magnetic core; the two coils D are respectively and independently wound to form a rectangular ring, the two coils D are attached to two opposite corners of the coil C, and the two coils B and the two coils D are arranged in a staggered mode. The invention is suitable for voltage transformation and regulation.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a loose coupling transformer.
Background
When the wired power transmission supplies power to a plurality of devices, the problems of messy winding and unattractive appearance exist; when power is supplied to underground equipment, dust explosion accidents are easily caused by electric sparks among contacts; when power is supplied to underwater equipment, the accident of hurting people by electric leakage is easy to occur; when power is supplied to the implanted medical equipment, the problems of easy infection, inconvenience and the like exist; when slip ring transmission is used for supplying power to rotary equipment, the problems of large mechanical abrasion, short service life and the like exist. The above disadvantages limit the application of contact power supply in these fields.
The Wireless Power Transfer (WPT) technology completes energy transmission through different media such as a space magnetic field, a space electric field, laser, microwave, sound waves and the like, has the advantages of flexible, convenient, safe and reliable electric energy access, no harmful pollutants released to the surrounding environment, no influence of surrounding dust, moisture and chemical corrosion, and can realize maintenance-free or low-maintenance reliable operation. According to the transmission mechanism, the existing wireless power transmission technology mainly comprises an electromagnetic induction type wireless power transmission technology, an electric field coupling type wireless power transmission technology, an electromagnetic radiation type wireless power transmission technology, an ultrasonic wave type wireless power transmission technology and the like, and the electromagnetic induction type wireless power transmission technology is simple in principle, easy to implement, large in transmission power, high in efficiency, optimal in comprehensive performance and capable of obtaining the most extensive attention and research.
The coupling mechanism has an important influence on the performance of the inductively coupled wireless power transfer system. In an actual system, the relative position of the original secondary side is not fixed, and the coupling coefficient of the coupling mechanism can change, so that the output fluctuation of the rectifier bridge is caused. In order to expand the effective working area of a wireless power transmission system and reduce the regulation range of a post-stage DC/DC converter, a strong anti-offset coupling mechanism is required. Planar circular coupling mechanisms, planar square coupling mechanisms, DD coupling mechanisms and solenoids are the four most commonly used coupling mechanisms, wherein the planar circular coupling mechanisms and the planar square coupling mechanisms have poor anti-offset performance, and the DD coupling mechanisms and the planar solenoid coupling mechanisms have outstanding anti-offset performance in the direction perpendicular to a magnetic field, but have poor anti-offset performance in the direction of the magnetic field, and the existing coupling mechanisms are difficult to meet the requirements of the wireless power transmission system on the anti-offset performance.
Disclosure of Invention
The invention aims to solve the problem that a coupling mechanism is poor in anti-offset performance of a magnetic field direction, and provides a 3S loose coupling transformer for wireless power transmission and a parameter determination method.
The invention relates to a 3S loose coupling transformer for wireless power transmission, which comprises a primary side coupling mechanism and a secondary side coupling mechanism;
the primary side coupling mechanism and the secondary side coupling mechanism are arranged oppositely; the primary side coupling mechanism is positioned at the lower side of the secondary side coupling mechanism;
the primary side coupling mechanism comprises a primary side ferrite magnetic core, a coil A and two coils B, wherein the coil A is tightly arranged and wound inwards along the edge of the primary side ferrite magnetic core to form a rectangular ring, and the coil A is attached to the upper surface of the primary side ferrite magnetic core; the two coils B are respectively and independently wound into rectangular rings, the two coils B are attached to two opposite corners of the coil A, and the diagonal lines of the two coils B are superposed with the diagonal line of the coil A;
the secondary side coupling mechanism comprises a secondary side ferrite magnetic core, a coil C and two coils D, wherein the coil C is tightly arranged inwards along the side of the secondary side ferrite magnetic core and wound to form a rectangular ring, and the coil C is attached to the lower surface of the secondary side ferrite magnetic core; the two coils D are respectively and independently wound into rectangular rings, the two coils D are attached to two opposite corners of the coil C, and the diagonal lines of the two coils D are superposed with the diagonal line of the coil C;
the two coils B and the two coils D are arranged in a staggered mode.
Further, the current directions in the coil a, the two coils B, the coil C and the two coils D coincide.
Further, the size of the rectangle wound by the two coils B and the number of turns of the winding are the same.
Further, the size of the rectangle wound by the two coils D and the number of turns of the winding are the same.
Further, the turn ratio of the coil a and the coil B is the same as the turn ratio of the coil C and the coil D.
Further, the primary ferrite core and the secondary ferrite core are both square. .
Further, the area of the primary ferrite core and the secondary ferrite core is 200X 200mm2。
Further, the turn ratio of the coil A and the coil B is determined by adopting a finite element simulation method.
The parameter determination method of the 3S loose coupling transformer for wireless power transmission comprises the following steps:
step one, according to the coupling inductance value needed by the transformer, the number of turns N of the coil A/the coil C1Or number of turns N of coil B/coil D2Setting the value as a fixed value;
step two, continuously changing the number of turns N of the coil B/coil D2Or coil A/coil C with N turns1(ii) a Calculating the value of the coupling retention coefficient CRR at different turn ratios to obtain the turn ratio of the coupling retention coefficient CRR at the maximum value;
step three, determining the number of turns N according to the optimal turn ratio and the coupling inductance value required by the transformer1、N2The method realizes the parameter determination of the 3S loosely-coupled transformer.
Further, the specific method for calculating the value of the coupling retention coefficient CRR at different turn ratios is as follows:
using the formula:
implementation of the calculation, in which kminAnd kmaxRespectively the minimum and maximum coupling coefficient during the shift.
The essential mechanism of strong anti-offset performance of the 3S loose coupling transformer is as follows: the invention makes the reduction of the coupling coefficient between the large coils and the increase of the coupling coefficient between the small coils basically equal, thus the variation of the coupling coefficient of the whole loose coupling transformer can be obviously reduced and the anti-offset performance of the loose coupling transformer can be enhanced.
Drawings
Fig. 1 is a 3S loosely coupled transformer for wireless power transmission according to the present invention;
FIG. 2 is a single-sided top view of a 3S loosely coupled transformer;
FIG. 3 is an overall top view of a 3S loosely coupled transformer;
FIG. 4 is a magnetic field distribution diagram of a 3S loosely-coupled transformer when the primary side coupling mechanism (1) and the secondary side coupling mechanism (2) are aligned;
FIG. 5 is a magnetic field distribution diagram of a 3S loosely-coupled transformer after a primary side coupling mechanism (1) and a secondary side coupling mechanism (2) are offset by 50 mm;
FIG. 6 is a magnetic field distribution diagram of a 3S loosely-coupled transformer after the primary side coupling mechanism (1) and the secondary side coupling mechanism (2) are offset by 80 mm;
FIG. 7 is a graph of 3S loosely coupled transformer coupling coefficient as a function of offset for a 4:10 turn ratio of the large and small coils;
fig. 8 is a graph of 3S loosely coupled transformer coupling coefficient versus offset for large and small coil turns of 16 and 40, respectively.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 1, and the 3s (three square) loose-coupling transformer for wireless power transmission according to the present embodiment includes a primary side coupling mechanism 1 and a secondary side coupling mechanism 2;
the primary side coupling mechanism 1 and the secondary side coupling mechanism 2 are arranged oppositely; the primary side coupling mechanism 1 is positioned at the lower side of the secondary side coupling mechanism 2;
the primary side coupling mechanism 1 comprises a primary side ferrite magnetic core 101, a coil A102 and two coils B103, wherein the coil A102 is tightly arranged inwards along the edge of the ferrite and wound into a rectangular ring, and the coil A102 is attached to the upper surface of the ferrite magnetic core; the two coils B103 are respectively and independently wound into rectangular rings, the two coils B103 are attached to two opposite corners of the coil A102, and the diagonal lines of the two coils B103 are superposed with the diagonal line of the coil A102;
the secondary side coupling mechanism 2 comprises a secondary side ferrite magnetic core 201, a coil C202 and two coils D203, wherein the coil C202 is tightly arranged inwards along the side of the ferrite and wound into a rectangular ring, and the coil C202 is attached to the lower surface of the secondary side ferrite magnetic core 201; the two coils D203 are respectively and independently wound into rectangular rings, the two coils D203 are attached to two opposite corners of the coil C202, and the diagonal lines of the two coils D203 are superposed with the diagonal line of the coil C202;
the two coils B103 are interleaved with the two coils D203.
The 3S loose coupling transformer comprises a primary side coupling mechanism 1 and a secondary side coupling mechanism 2, wherein the primary side coupling mechanism 1 and the secondary side coupling mechanism 2 are both composed of a ferrite magnetic core, a large coil (a coil A102 or a coil C202) and two small coils (a coil B103 or a coil D203), the large coil and the small coils are wound in the same direction (clockwise or anticlockwise), the large coil and the small coils are connected in series to form an integral coil, the two small coils (the coil B103) on the primary side and the secondary side are arranged in a staggered mode, and if the two small coils (the coil B103) on the primary side are respectively positioned in quadrants 1 and 3 of the ferrite magnetic core, the two small coils (the coil D203) on the secondary side are respectively positioned in quadrants 2 and 4. The single-side top view and the whole top view of the 3S loosely coupled transformer are shown in fig. 2 and fig. 3 (without ferrite core), where coils a102 and B are primary coils (corresponding to the lower layer in fig. 1), coils C202 and D are secondary coils (corresponding to the upper layer in fig. 1), coils B and D are small coils, coils a and C are large coils, the outer contours of the small coils and the large coils are overlapped, and the current directions of all the coils are the same.
When the primary side or secondary side coupling mechanism 2 moves along the X or Y axis, a group of coils are in an overlapped state from an interlaced state, the coupling coefficient between large coils is reduced due to offset, but the coupling coefficient between coils in the overlapped state is increased, the overall coupling coefficient is compensated, the reduction speed of the overall coupling coefficient along with the offset is reduced, and the anti-offset performance of the coupling mechanism is enhanced. For example, when the secondary side coupling mechanism 2 is shifted in the Y direction, the distance between the coil a and the coil C becomes larger and larger, and the coupling coefficient gradually decreases, but the coil B and the coil D become closer and larger, and the decrease of the coupling coefficient of the large coil is offset to some extent, and when the 3S loose coupling transformer is shifted from the positive position to the half-shift position (the shift distance is equal to one-half side length), the decrease speed of the coupling coefficient is slowed down.
Further, the winding directions of the coil a102, the two coils B103, the coil C202, and the two coils D203 coincide.
Further, the directions of the currents in the coil a102, the two coils B103, the coil C202, and the two coils D203 coincide.
Further, the size of the rectangle wound by the two coils B103 and the number of turns of the winding are the same.
Further, the size of the rectangle wound by the two coils D203 and the number of turns of the winding are the same.
Further, the turn ratio of coil a102 to coil B103 is the same as the turn ratio of coil C202 to coil D203.
In practical applications, not all 3S loosely coupled transformers have good offset resistance. The anti-offset performance of the 3S loose coupling transformer mainly depends on the descending speed of the coupling coefficient of the large coil (coils A and C) and the increasing speed of the coupling coefficient of the small coil (coils B and D) and the weight of the coupling coefficient of the large coil and the coupling coefficient of the small coil in the whole coupling coefficient during offset, in the wireless power transmission system, the size and the transmission distance of the coupling mechanism are generally determined by specific application, once the size and the transmission distance are determined, the descending speed of the coupling coefficient of the large coil and the increasing speed of the coupling coefficient of the small coil are basically determined, therefore, the optimal anti-offset performance is obtained by changing the turn ratio of the large coil and the small coil and further changing the weight of the coupling coefficient of the large coil and the small coil in the whole coupling coefficient.
In order to cope with the offset of each direction of a plane, the 3S loose coupling transformer is designed to be in a central symmetry structure, the number of turns of the primary coil and the secondary coil only affects the inductance values of the primary coupling mechanism and the secondary coupling mechanism, and the anti-offset performance of the 3S loose coupling transformer is not affected, so that the turn ratio of the coil A102 to the coil B103 and the turn ratio of the coil C202 to the coil D203 are only needed to be designed.
Further, the primary ferrite core 101 and the secondary ferrite core 201 are both square.
Further, the area of the primary side ferrite core 101 and the secondary side ferrite core 201 is 200X 200mm2。
In the present embodiment, the areas of the upper and lower sides of the primary ferrite core 101 and the secondary ferrite core 201 are 200X 200mm2。
Further, the turn ratio of the coil a102 and the coil B103 is determined by using a finite element simulation method.
As a preferred scheme, the method adopts finite element simulation to determine the turn ratio of the large coil and the small coil, and comprises the following specific steps: firstly, the number of turns N of a large coil is increased1Or a small number of turns N2Setting the number of turns of the large coil to be a fixed value, and reasonably determining the number N of turns of the large coil according to the coupling inductance value required by the system to improve the optimization effect1Or small number of turns N2(ii) a Then continuously changing the number N of turns of the small coil2Or a large number of coil turns N1Calculating coupling retention coefficients CRR (kmin and kmax are respectively the minimum and maximum coupling coefficients in the offset process) at different turn ratios according to a formula (1), and selecting the turn ratio at the maximum CRR as an optimal turn ratio; and finally, determining the number of turns N of the large coil and the small coil according to the coupling inductance value required by the system and the optimal turn ratio1、N2. The optimal turn ratio optimized for a specific application is not suitable for other applications, and when the working conditions (size of the coupling mechanism, transmission distance, input voltage, output power and the like) are changed, new optimal turn ratio needs to be obtained through re-simulation.
The anti-offset performance of the 3S loose coupling transformer mainly depends on the descending speed of the coupling coefficient of the large coil and the increasing speed of the coupling coefficient of the small coil during offset and the weight of the coupling coefficient of the large coil and the coupling coefficient of the small coil occupying the whole coupling coefficient. In order to cope with the deviation of the planes in all directions, the 3S loose coupling transformer is designed to be in a central symmetry structure, namely, the two coils B103 are equal in size and number of turns, and the two coils D203 are equal in size and number of turns. The number of turns of the primary and secondary large coils only affects the inductance values of the primary and secondary coupling mechanisms 2, and does not affect the anti-offset performance of the 3S loose coupling transformer, so that the turn ratio of the coils A102 and B and the coils C202 and D only needs to be designed. Preferably, the turn ratio of coils A102 and B is equal to the turn ratio of coils C202 and D.
The parameter determination method of the 3S loose coupling transformer for wireless power transmission comprises the following steps:
step one, according to the coupling inductance value needed by the transformer, the number of turns N of the coil A102/the coil C202 is adjusted1Or the number of turns N of coil B103/coil D2032Setting the value as a fixed value;
step two, continuously changing the number of turns N of the coil B103/the coil D2032Or coil A102/wireNumber of turns N of the ring C2021(ii) a Calculating the value of the coupling retention coefficient CRR when the turn ratios are different, and obtaining the turn ratio when the value of the coupling retention coefficient CRR is maximum;
step three, determining the number of turns N according to the optimal turn ratio and the coupling inductance value required by the transformer1、N2The method realizes the parameter determination of the 3S loosely-coupled transformer.
Further, the specific method for calculating the value of the coupling retention coefficient CRR at different turn ratios is as follows:
using the formula:
implementation of the calculation, in which kminAnd kmaxRespectively the minimum and maximum coupling coefficient during the shift.
The invention specifically comprises the following steps of: firstly, the number of turns N of a large coil (coil A102 and coil C202)1Or the number of turns N of the small coil (coil B103 and coil D203)2Setting the number of turns of the large coil to be a fixed value, and reasonably determining the number N of turns of the large coil according to the coupling inductance value required by the system to improve the optimization effect1Or small number of turns N2(ii) a Then continuously changing the number N of turns of the small coil2Or a large number of coil turns N1Calculating the coupling retention coefficient CRR (k in the formula) at different turn ratios according to the formula (1)minAnd kmaxMinimum and maximum coupling coefficients in the migration process respectively), and selecting the turn ratio when the CRR is maximum as the optimal turn ratio; and finally, determining the number of turns N of the large coil and the small coil according to the coupling inductance value required by the system and the optimal turn ratio1、N2. The optimal turn ratio optimized for a specific application is not suitable for other applications, and when the working conditions (size of the coupling mechanism, transmission distance, input voltage, output power and the like) are changed, new optimal turn ratio needs to be obtained through re-simulation.
The essential mechanism of strong anti-offset performance of the 3S loosely-coupled transformer is as follows: the coil offset weakens the coupling between the large coils on the primary side and the secondary side, but improves the coupling between the small coils on the primary side and the secondary side.
Under the opposite condition, the primary and secondary small coils of the 3S loose coupling transformer are in the staggered position, and the magnetic field between the small coils and the magnetic field between the large coils are mutually superposed to form the magnetic field distribution as shown in figure 4. Compared with a planar square loose coupling transformer, the 3S loose coupling transformer has a longer magnetic path and a slightly lower coupling coefficient when facing.
After the offset, one group of small coils is changed from the staggered state to the overlapped state, at this time, the magnetic field generated by the large coil is weakened, the magnetic field of the 3S loose coupling transformer is influenced by the overlapped small coils and is concentrated between the two small coils, as shown in fig. 5, the outer dimensions of the primary side coupling mechanism and the secondary side coupling mechanism in the figure are both 200 multiplied by 200mm2. After the offset, the coupling coefficient between the large coils is reduced, the coupling coefficient between the small coils is increased, and the overall coupling coefficient can be ensured to be basically unchanged by reasonably designing the turn ratio of the large coils and the small coils.
Continuing to increase the offset distance to 80mm, the magnetic field between the large coils is significantly weaker and is mainly influenced by the two overlapping small coils, concentrating between the two small coils, as shown in fig. 6, when the coupling coefficient k of the loosely coupled transformer is such that3SMainly depending on the coupling coefficient between the small coils. DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
This embodiment will describe in detail a complete design process of a 3S loosely coupled transformer with mutual inductance of about 80 μ H, so as to further explain the present invention. The main constraints of an application on a loosely coupled transformer are shown in table 1.
TABLE 1 Primary constraints of certain applications on loosely coupled transformers
In the embodiment, ANSYS Maxwell software is adopted to optimize the 3S loose coupling transformer. First, 3 is drawn in MaxwellS model of loosely coupled transformer. In the optimization process, the number of turns N of the small coil is firstly reduced2Fixed at 10 turns by changing the number of turns N of the large coil1The turn ratio of the large coil and the small coil is adjusted. When the number of turns of the coil is large, N1When the value is equal to 4, the coupling coefficient of the 3S loose coupling transformer hardly changes with the change of the offset distance, the CRR is as high as 0.92 when the offset distance is 100mm, and the variation of the coupling coefficient of the 3S loose coupling transformer with the offset is shown in FIG. 7.
Although the coupling coefficient is slightly changed and uniformly distributed near 0.103, the mutual inductance is only about 5 muH and is far lower than the required mutual inductance value, and the number of turns of the large coil and the small coil must be increased proportionally. Since the mutual inductance is proportional to the square of the number of turns, it can be obtained that the large coil should have 16 turns and the small coil should have 40 turns, when the offset curve is as shown in fig. 8.
It can be seen that the coupling coefficient curve at this time is almost the same as before, and the coupling coefficient still fluctuates slightly around 0.103. The mutual inductance value at this time is 85.5 muH, and the requirement of mutual inductance is met. Therefore, when the large and small coils have 16 turns and 40 turns, respectively, the variation of the coupling coefficient with the offset is minimized, and the mutual inductance is around 80 μ H.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (11)
1. The 3S loose coupling transformer for wireless power transmission is characterized by comprising a primary side coupling mechanism (1) and a secondary side coupling mechanism (2);
the primary side coupling mechanism (1) and the secondary side coupling mechanism (2) are arranged oppositely; the primary side coupling mechanism (1) is positioned at the lower side of the secondary side coupling mechanism (2);
the primary side coupling mechanism (1) comprises a primary side ferrite magnetic core (101), a coil A (102) and two coils B (103), wherein the coil A (102) is tightly arranged inwards along the edge of the primary side ferrite magnetic core (101) in a winding manner to form a rectangular ring, and the coil A (102) is attached to the upper surface of the primary side ferrite magnetic core (101); the two coils B (103) are respectively and independently wound into rectangular rings, the two coils B (103) are attached to two opposite corners of the coil A (102), and the diagonal lines of the two coils B (103) are superposed with the diagonal line of the coil A (102);
the secondary coupling mechanism (2) comprises a secondary ferrite core (201), a coil C (202) and two coils D (203), wherein the coil C (202) is tightly wound into a rectangular ring inwards along the side of the secondary ferrite core (201), and the coil C (202) is attached to the lower surface of the secondary ferrite core (201); the two coils D (203) are respectively and independently wound to form a rectangular ring, the two coils D (203) are attached to two opposite corners of the coil C (202), and the diagonal lines of the two coils D (203) are superposed with the diagonal line of the coil C (202);
the two coils B (103) are interleaved with the two coils D (203).
2. The 3S loose-coupling transformer for wireless power transmission according to claim 1, wherein the winding directions of the coil A (102), the two coils B (103), the coil C (202) and the two coils D (203) are the same.
3. 3S loosely coupled transformer for wireless power transfer according to claim 2, characterized in that the current direction in coil a (102), two coils B (103), coil C (202) and two coils D (203) coincide.
4. A 3S loose coupling transformer for wireless power transmission according to claim 3, wherein the size of the rectangle wound by the two coils B (103) and the number of turns of the winding are the same.
5. A3S loose coupling transformer for wireless power transmission according to claim 4, wherein the size of the rectangle wound by the two coils D (203) and the number of turns of the winding are the same.
6. A3S loose coupling transformer for wireless power transmission according to claim 4, wherein the turn ratio of coil A (102) to coil B (103) is the same as the turn ratio of coil C (202) to coil D (203).
7. A3S loosely coupled transformer for wireless power transfer according to claim 4, wherein the primary ferrite core (101) and the secondary ferrite core (201) are square.
8. A3S loosely coupled transformer for wireless power transfer according to claim 7, wherein the primary ferrite core (101) and the secondary ferrite core (201) have an area of 200 x 200mm2。
9. A3S loosely coupled transformer for wireless power transmission according to claim 4, wherein a limiting element simulation method is used to determine the turns ratio of coil A (102) and coil B (103).
10. A method for determining parameters of a 3S loosely-coupled transformer for wireless power transmission according to claim 1, comprising:
step one, according to the coupling inductance value needed by the transformer, the number N of turns of the coil A (102) or the coil C (202) is adjusted1Or the number of turns N of coil B (103) or coil D (203)2Setting the value as a fixed value;
step two, continuously changing the number of turns N of the coil B (103) or the coil D (203)2Or the number of turns N of coil A (102) or coil C (202)1(ii) a Calculating the value of the coupling retention coefficient CRR at different turn ratios to obtain the turn ratio of the coupling retention coefficient CRR at the maximum value;
step three, determining the number of turns N according to the optimal turn ratio and the coupling inductance value required by the transformer1、N2Specific value of (3S), parameters for realizing 3S loosely-coupled transformersAnd (4) determining.
11. The method for determining parameters of a 3S loosely-coupled transformer for wireless power transmission according to claim 10, wherein the specific method for calculating the value of the coupling retention coefficient CRR at different turn ratios is as follows:
using the formula:
implementation of the calculation, in which kminAnd kmaxRespectively the minimum and maximum coupling coefficient during the shift.
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