CN116345714A - Self-decoupling coupling mechanism and anti-offset IPT system formed by same - Google Patents
Self-decoupling coupling mechanism and anti-offset IPT system formed by same Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The invention relates to the technical field of wireless power transmission, and particularly discloses an automatic decoupling coupling mechanism and an anti-offset IPT system formed by the same. The anti-offset IPT system adopts a designed self-decoupling coupling mechanism, and can maintain the output voltage of the system in a certain range under the offset condition by designing a primary side resonance network and a secondary side resonance network.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to an automatic decoupling coupling mechanism and an anti-offset IPT system formed by the same.
Background
Wireless power transfer (wireless power transfer, WPT) technology relies on transmission media such as magnetic fields, electric fields, lasers, microwaves, etc. to achieve contactless, spaced-apart power transfer. In a traditional magnetic coupling wireless power transmission (IPT) system, a coupling mechanism is usually composed of two rectangular or circular coils, in practical application, a receiving end and a transmitting end are difficult to be completely opposite to each other, when the positions of the receiving end and the transmitting end deviate, the output parameters of the system change, and the output parameters drop more rapidly along with the increase of the deviation distance, so that the system cannot work normally.
How to realize the output stability of the coupling mechanism in the offset state is a big problem currently faced. In order to solve the plane offset problem of the IPT system, many researchers have conducted intensive research at present, and the system is mainly enabled to resist larger plane offset from the design of a coupling mechanism and the view of a compensation network topology structure.
Currently, the methods commonly used to improve the offset resistance are:
1. the design of the coupling mechanism: by adding two relay coils between the transmitting coil and the receiving coil, when the receiving end deflects, the system deflection resistance is realized through the compensation of the receiving coil. But this approach greatly increases the size of the transmit and receive coils;
2. and (3) designing a compensating network topology structure: the primary side and the secondary side respectively connect different topologies in series to form a mixed topology, so that constant voltage output characteristics are realized, and after the system is shifted, mutual inductance changes to counteract the mutual inductance effects, so that anti-shifting is realized. However, the structure of the mode is complex, which is not beneficial to practical application.
Disclosure of Invention
The invention provides a self-decoupling coupling mechanism and an anti-offset IPT system formed by the self-decoupling coupling mechanism, which solve the technical problems that: how to provide a novel coupling mechanism, which can have stronger anti-offset capability without increasing the sizes of a transmitting coil and a receiving coil, and how to apply the coupling mechanism in an IPT system to realize constant voltage output.
In order to solve the technical problems, the invention provides an auto-decoupling coupling mechanism, which comprises a transmitting structure and a receiving structure;
the transmitting structure comprises a DD-type transmitting coil and a solenoid-type transmitting coil which is orthogonally wound on the DD-type transmitting coil so that the transmitting structure is of a symmetrical structure;
the receiving structure comprises a DD type receiving coil and a solenoid type receiving coil which is orthogonally wound on the DD type receiving coil so that the receiving structure is a symmetrical structure;
the DD-type transmitting coil and the DD-type receiving coil are arranged in the same direction.
Preferably, the solenoid-type transmitting coil is formed by connecting the same first solenoid-type transmitting sub-coil and the same second solenoid-type transmitting sub-coil in series;
the solenoid-type receiving coil is formed by connecting the same first solenoid-type receiving sub-coil and the same second solenoid-type receiving sub-coil in series.
Preferably, the transmitting structure further includes a primary side magnetic core, the receiving structure further includes a secondary side magnetic core, the transmitting structure is relatively located below the receiving structure, the primary side magnetic core is located between the DD-type transmitting coil and the solenoid-type transmitting coil on the lower side, and the secondary side magnetic core is located between the DD-type receiving coil and the solenoid-type receiving coil on the upper side.
Preferably, the DD-type transmitting coil and the DD-type receiving coil adopt square DD-type coils, and the side length of the DD-type coils is D 1 The distance between the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil and the DD-type transmitting coil edge is D 2 The distance between the first solenoid-type transmitting sub-coil and the second solenoid-type transmitting sub-coil is D 3 The first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is at a distance D from the DD type receiving coil edge 4 The distance between the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 5 The width of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is D 6 The width of the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 7 The number of turns of the DD type transmitting coil is N 11 The number of turns of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is N 12 The number of turns of the DD receiving coil is N 21 The number of turns of the first solenoid-type receiving sub-coil or the second solenoid-type receiving sub-coil is N 22 D is then 1 、D 2 、D 3 、D 4 、D 5 、D 6 、D 7 、N 11 、N 12 、N 21 、N 22 The method comprises the following steps of:
determining the dimension D of the coupling mechanism according to the actual requirement 1 Determining a transmission distance D according to actual requirements;
m reasonable according to the required transmission power and the required transmission efficiency of the system at the transmission distance D 11 And M 22 ，M 11 Representing the mutual inductance between the DD-type transmitting coil and the DD-type receiving coil, M 22 Representing a mutual inductance between the solenoid-type transmitting coil and the solenoid-type receiving coil;
determination of turns N by simulation 11 、N 12 、N 21 、N 22 ；
Determining D from offset requirements 2 、D 4 ；
According to D 6 ＝N 12 *(r+d)、D 7 ＝N 22 * (r+d) determination of D 6 、D 7 R is the wire diameter of the coil, d is the wire distance, and r and d are determined according to actual requirements;
according to D 3 ＝D 1 -(2*D 6 )、D 5 ＝D 1 -(2*D 7 ) Determining D 3 、D 5 。
Preferably, the DD-type transmitting coil is connected with a primary LCC-type compensation network to be used as a first primary resonant circuit together, the solenoid-type transmitting coil is connected with a primary compensation capacitor to be used as a second primary resonant circuit together, and the first primary resonant circuit is connected with the second primary resonant circuit in parallel;
the DD-type receiving coil is connected with the secondary side compensation capacitor to be used as a first secondary side resonance circuit together, the solenoid-type receiving coil is connected with the secondary side LCC-type compensation network to be used as a second secondary side resonance circuit together, and the first secondary side resonance circuit is connected with the second secondary side resonance circuit in series.
Preferably, the series compensation inductance in the primary LCC type compensation network is denoted as L f1 The series compensation inductance in the secondary LCC type compensation network is denoted as L f2 ，L f1 、L f2 Determined by the following formula:
wherein U is p Represents the inversion output voltage of the system transmitting end, U o Representing the rectified input voltage at the receiving end of the system.
The invention also provides an anti-offset IPT system formed by the self-decoupling coupling mechanism, which is characterized in that: the device comprises a transmitting end and a receiving end; the transmitting end comprises a direct-current power supply, an inverter and a primary side resonant circuit, and the receiving end comprises a secondary side resonant circuit, a rectifying and filtering circuit and a load;
the primary side resonant circuit comprises a first primary side resonant circuit and a second primary side resonant circuit which are connected in parallel at the output end of the inverter, the first primary side resonant circuit comprises a first primary side compensation network and the DD-type transmitting coil which are connected, and the second primary side resonant circuit comprises a second primary side compensation network and the solenoid-type transmitting coil which are connected;
the primary side resonant circuit comprises a first secondary side resonant circuit and a second secondary side resonant circuit which are connected in series with the rectifying and filtering circuit, the first secondary side resonant circuit comprises a first secondary side resonant network and the DD-type receiving coil which are connected, and the second secondary side resonant circuit comprises a second secondary side resonant network and the solenoid-type receiving coil which are connected.
Preferably, the first primary compensation network adopts a primary LCC type compensation network, and the second primary compensation network adopts a primary compensation capacitor;
the first secondary side compensation network adopts a secondary side compensation capacitor, and the second secondary side compensation network adopts a secondary side LCC type compensation network.
Preferably, parameters of the primary side LCC type compensation network and the secondary side LCC type compensation network are set by the following steps:
according to the mutual inductance M between the DD-type transmitting coil and the DD-type receiving coil 11 And a mutual inductance M between the solenoid-type transmitting coil and the solenoid-type receiving coil 22 And formula (VI)
Determining a series compensation inductance L in the primary LCC type compensation network f1 Series compensation inductance L in the secondary side LCC type compensation network f2 ；
And determining other parameters of the primary side LCC type compensation network and the secondary side LCC type compensation network according to the coordination relation.
Preferably, the primary side compensation capacitance and the secondary side compensation capacitance are determined according to a matching formula.
According to the self-decoupling coupling mechanism provided by the invention, the transmitting structure and the receiving structure are formed by combining the DD-shaped coil and the flat solenoid coil, and the two coils can be decoupled from each other naturally, so that only mutual inductance between the DD-shaped coil and mutual inductance between the flat solenoid coil exist between the transmitting structure and the receiving structure, and when the magnetic field distribution of the coupling mechanism enables the coupling mechanism at the receiving end of the system to deviate, the mutual inductance is kept stable within a certain range, and the anti-deviation capability is improved.
The anti-offset IPT system formed by the self-decoupling coupling mechanism adopts the designed self-decoupling coupling mechanism, and the output voltage of the system can be maintained within a certain range under the offset condition by designing the primary side resonance network and the secondary side resonance network.
Drawings
Fig. 1 is a perspective view of an auto-decoupling coupling mechanism according to an embodiment of the present invention;
fig. 2 is a plan view of an auto-decoupling coupling mechanism according to an embodiment of the present invention, where fig. 2 (a) is a top view of a transmitting structure and fig. 2 (b) is a bottom view of a receiving structure;
FIG. 3 is a diagram of the placement of transmit coils according to an embodiment of the present invention;
fig. 4 is a magnetic field distribution diagram of a transmitting structure according to an embodiment of the present invention, wherein fig. 4 (a) is a magnetic field distribution diagram of a transmitting coil 1, and fig. 4 (b) is a magnetic field distribution diagram of a transmitting coil 2;
FIG. 5 is an architecture diagram of an anti-offset IPT system employing an auto-decoupling coupling mechanism provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of fig. 5 provided by an embodiment of the present invention.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
Example 1
The embodiment of the invention provides an auto-decoupling coupling mechanism, the structure of which is shown in fig. 1, comprising a transmitting structure and a receiving structure, wherein the transmitting structure comprises a DD-type transmitting coil (namely a transmitting coil 1) and a solenoid-type transmitting coil (namely a transmitting coil 2) which is orthogonally wound on the DD-type transmitting coil so that the transmitting structure is a symmetrical structure. The receiving structure includes a DD-type receiving coil (i.e., receiving coil 1), and a solenoid-type receiving coil (i.e., receiving coil 2) orthogonally wound on the DD-type receiving coil such that the receiving structure is a symmetrical structure;
the DD-type transmitting coil and the DD-type receiving coil are arranged in the same direction.
As shown in fig. 1, the solenoid-type transmitting coil is formed by connecting the same first solenoid-type transmitting sub-coil (i.e., transmitting coil 2-1) and the same second solenoid-type transmitting sub-coil (i.e., transmitting coil 2-2) in series;
the solenoid-type receiving coil is formed by connecting the same first solenoid-type receiving sub-coil (i.e., receiving coil 2-1) and the second solenoid-type receiving sub-coil (i.e., receiving coil 2-2) in series.
As shown in fig. 1, in order to increase the magnetic coupling capability, the transmitting structure further includes a primary side magnetic core, the receiving structure further includes a secondary side magnetic core, the transmitting structure is relatively located below the receiving structure, the primary side magnetic core is located between the DD-type transmitting coil and the solenoid-type transmitting coil on the lower side, and the secondary side magnetic core is located between the DD-type receiving coil and the solenoid-type receiving coil on the upper side.
Referring to the plan view of fig. 2, where fig. 2 (a) is a top view of the transmitting structure and fig. 2 (b) is a bottom view of the receiving structure, the coupling mechanism parameters shown in this example are defined as follows:
the DD-type transmitting coil and the DD-type receiving coil adopt square DD-type coils, and the side length of the DD-type coils is D 1 The first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is spaced from the edge of the DD-type transmitting coil by a distance D 2 The distance between the first solenoid-type transmitting sub-coil and the second solenoid-type transmitting sub-coil is D 3 The first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is spaced from the edge of the DD type receiving coil by a distance D 4 The distance between the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 5 The width of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is D 6 The width of the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 7 The DD type transmitting coil has N turns 11 The number of turns of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is N 12 The DD type receiving coil has the turns of N 21 The number of turns of the first solenoid-type receiving sub-coil or the second solenoid-type receiving sub-coil is N 22 。
For ease of analysis, the positioning between the transmit coils is shown in FIG. 3, the transmit coils 1 andthe transmitting coils 2 are symmetrically designed and they are placed at the same center point O, I 1 And I2 represent excitation current vectors flowing through the transmitting coil 1 and the transmitting coil 2, respectively.
And->
Representing the angle between any point on the transmit coil 1 and the transmit coil 2, respectively, and the X-axis.
The mutual inductance value M between coil i and coil j according to the Neiman formula ij Can be expressed as:
L i and L j Representing the length vectors, r, of coil i and coil j, respectively ij Represents dL i And dL j A distance therebetween; mu (mu) 0 Is vacuum permeability, N 1 And N 2 Representing the number of turns of the transmit coil 1 and transmit coil 2, respectively. The mutual inductance between the transmitting coil 1 and the transmitting coil 2 can be expressed as:
M 12 ＝M 1-2L +M 1-2R (2)
2L represents the left half of the transmitting coil 2, i.e. transmitting coils 2-1,2R, and the right half of the transmitting coil 2, i.e. transmitting coil 2-2, then M 1-2L Representing mutual inductance of the left half of the transmitting coil 1 and the transmitting coil 2, M 1-2R Indicating the mutual inductance of the right half of the transmit coil 1 and transmit coil 2.
According to equation (2), the mutual inductance of equation (1) can be expressed as:
wherein x' i And y' i Respectively represent x i And y i I=1, 2;
(x i ，y i ) Represents a point on coil i, (x) j ，y j ) Representing the point on coil j, both points being on the same vertical line of the two coils.
The integration direction of the formulas (3) and (4) is determined by the winding direction of the coil, i.e., the reference direction of the current. Solving the equations (3) and (4) using the numerical integration function in MATLAB can result in:
as can be seen from equation (6), the transmit coil 1 and the transmit coil 2 are decoupled from each other. Condition that equation is satisfied and D 1 、D 2 、D 3 Independent of the relative size of the transmitter coil 2 and independent of the position of the transmitter coil in the middle or on both sides. Therefore, the decoupling condition of the two transmit coils has no direct relation to their size and up-down position.
Fig. 4 is a magnetic field pattern of the transmitting structure, wherein fig. 4 (a) is a magnetic field pattern of the transmitting coil 1, and fig. 4 (b) is a magnetic field pattern of the transmitting coil 2. As can be seen from fig. 4 (a), the magnetic field of the transmitting coil 1 is mainly along the X direction, and as can be seen from fig. 4 (b), the magnetic field of the transmitting coil 2 is mainly along the Y direction, and the magnetic fields between the two transmitting coils are 90 ° crossed and decoupled from each other.
Parameter D of the coupling mechanism 1 、D 2 、D 3 、D 4 、D 5 、D 6 、D 7 、N 11 、N 12 、N 21 、N 22 The method comprises the following steps of:
determining the dimension D of the coupling mechanism according to the actual requirement 1 According to the value of (1)Determining a transmission distance D according to the inter-requirement;
m reasonable according to the required transmission power and the required transmission efficiency of the system at the transmission distance D 11 And M 22 ，M 11 Representing the mutual inductance between the DD-type transmitting coil and the DD-type receiving coil, M 22 Representing a mutual inductance between the solenoid-type transmitting coil and the solenoid-type receiving coil;
determination of turns N by simulation 11 、N 12 、N 21 、N 22 ；
Determining D from offset requirements 2 、D 4 ；
According to D 6 ＝N 12 *(r+d)、D 7 ＝N 22 * (r+d) determination of D 6 、D 7 R is the wire diameter of the coil, d is the wire distance, and r and d are determined according to actual requirements;
according to D 3 ＝D 1 -(2*D 6 )、D 5 ＝D 1 -(2*D 7 ) Determining D 3 、D 5 。
As an application example, when the coupling mechanism provided by the invention is applied to a wireless charging system of an electric automobile, the architecture of the system is shown in fig. 5, the circuit principle is shown in fig. 6, the DD-type transmitting coil is connected with a primary side LCC type compensation network to be used as a first primary side resonance circuit together, the solenoid-type transmitting coil is connected with a primary side compensation capacitor to be used as a second primary side resonance circuit together, and the first primary side resonance circuit is connected with the second primary side resonance circuit in parallel. The DD-type receiving coil is connected with the secondary side compensation capacitor to be used as a first secondary side resonance circuit together, the solenoid-type receiving coil is connected with the secondary side LCC-type compensation network to be used as a second secondary side resonance circuit together, and the first secondary side resonance circuit is connected with the second secondary side resonance circuit in series. Wherein the series compensation inductance in the primary LCC type compensation network is denoted as L f1 The series compensation inductance in the secondary LCC type compensation network is denoted as L f2 The mutual inductance between the DD-type transmit coil and the DD-type receive coil is denoted as M 11 The mutual inductance between the solenoid-type transmitting coil and the solenoid-type receiving coil is denoted as M 22 。
The embodiment of the invention adopts a dual-transmitting dual-receiving mode, the primary side compensation network adopts an LCC (LCC) and S network parallel mode, and the secondary side compensation network adopts an S and LCC serial mode, so that two transmitting coils can transmit energy at the same time, and two receiving coils can receive energy at the same time. The electrical parameters of the system are defined as shown in table 1, where i=1, 2; j=1, 2,3,4.
Table 1 definition of electrical parameters
The DD coil and the flat spiral coil positioned on the same side are decoupled by a coupling mechanism model, and simultaneously under any plane deviation, the DD coil of the transmitting end, the flat spiral coil of the receiving end, the flat spiral coil of the transmitting end and the DD coil of the receiving end are decoupled, so that only 2 pairs of mutual inductances are stored in the system, namely L p1 And L is equal to s1 Mutual inductance M between 11 L and L p2 And L is equal to s2 Mutual inductance M between 22 。
On the primary side, the inductance L f1 And capacitor C f1 Forms a resonant network, the primary coil L P And capacitor C p 、C f1 Forming a resonant network. On the secondary side, a secondary primary coil L s And capacitor C s 、C f2 Forms a resonant network, inductance L f2 And capacitor C f2 A resonant network is formed, whereby:
writing a KVL equation to the LCC-S/S-LCC composite topology column to obtain:
substituting the formula (7) into the formula (8) for simplification to obtain:
from equation (9), the system output voltage and the equivalent load resistance R L Regardless, the system can achieve constant voltage output. When the system is offset, U o And M is as follows 11 Proportional to M 22 Inversely proportional, when M 11 And M 22 When simultaneously increasing or decreasing, M 11 And M 22 To U o The action of (a) is exactly opposite to U o The change plays a role in inhibition. Thus reasonably configuring M 11 、M 22 、L f1 And L f2 Can make the system output voltage U under the offset condition o Is maintained within a certain range. Specifically, L f1 、L f2 Determined by the following formula:
U p represents the inversion output voltage of the system transmitting end, U o Representing the rectified input voltage at the receiving end of the system.
In summary, according to the self-decoupling coupling mechanism provided by the embodiment of the invention, the transmitting structure and the receiving structure are formed by combining the DD-type coil and the flat solenoid coil, and the two coils can be decoupled from each other naturally, so that only mutual inductance between the DD-type coil and mutual inductance between the flat solenoid coil exist between the transmitting structure and the receiving structure, and when the magnetic field distribution of the coupling mechanism enables the coupling mechanism of the receiving end of the system to deviate, the mutual inductance is kept stable within a certain range, thereby improving the anti-deviation capability.
Example 2
The present embodiment provides an anti-offset IPT system composed of the self-decoupling coupling mechanism shown in embodiment 1, as shown in fig. 5 and 6, including a transmitting end and a receiving end. The transmitting end comprises a direct-current power supply, an inverter and a primary side resonant circuit, and the receiving end comprises a secondary side resonant circuit, a rectifying and filtering circuit (comprising a rectifier and a filtering capacitor) and a load.
The primary side resonant circuit comprises a first primary side resonant circuit and a second primary side resonant circuit which are connected in parallel at the output end of the inverter, the first primary side resonant circuit comprises a first primary side compensation network and a DD type transmitting coil which are connected, and the second primary side resonant circuit comprises a second primary side compensation network and a solenoid type transmitting coil which are connected.
The system adopts the same resonant network as in embodiment 1, specifically, the primary side resonant circuit comprises a first secondary side resonant circuit and a second secondary side resonant circuit which are connected in series with the rectifying and filtering circuit, the first secondary side resonant circuit comprises a first secondary side resonant network and a DD type receiving coil which are connected, and the second secondary side resonant circuit comprises a second secondary side resonant network and a solenoid type receiving coil which are connected.
In the system, a primary LCC type compensation network is adopted as a first primary compensation network, and a primary compensation capacitor is adopted as a second primary compensation network;
the first secondary side compensation network adopts a secondary side compensation capacitor, and the second secondary side compensation network adopts a secondary side LCC type compensation network.
The parameters of the primary side resonance circuit and the secondary side resonance circuit are determined by the following steps:
according to the actual needs and the formula
Determine L f1 And L f2 ；
Omega can be determined according to the actual operating frequency of the system;
other parameters of the primary side LCC type compensation network and the secondary side LCC type compensation network can be determined according to the resonance relation, and a primary side compensation capacitance and a secondary side compensation capacitance can be determined:
except for the dc power supply, the inverter, and the rectifying and filtering circuit, the rest of the system is identical to embodiment 1, so that the description of this embodiment is omitted.
The anti-offset IPT system formed by the self-decoupling coupling mechanism provided by the embodiment of the invention adopts the designed self-decoupling coupling mechanism, and the output voltage of the system can be maintained within a certain range under the offset condition by designing the primary side resonance network and the secondary side resonance network.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. An self-decoupling coupling mechanism, comprising a transmitting structure and a receiving structure;
the transmitting structure comprises a DD-type transmitting coil and a solenoid-type transmitting coil which is orthogonally wound on the DD-type transmitting coil so that the transmitting structure is of a symmetrical structure;
the receiving structure comprises a DD type receiving coil and a solenoid type receiving coil which is orthogonally wound on the DD type receiving coil so that the receiving structure is a symmetrical structure;
the DD-type transmitting coil and the DD-type receiving coil are arranged in the same direction.
2. An self-decoupling coupling mechanism as claimed in claim 1, wherein:
the solenoid-type transmitting coil is formed by connecting the same first solenoid-type transmitting sub-coil and the same second solenoid-type transmitting sub-coil in series;
the solenoid-type receiving coil is formed by connecting the same first solenoid-type receiving sub-coil and the same second solenoid-type receiving sub-coil in series.
3. An self-decoupling coupling mechanism as claimed in claim 2, wherein:
the transmitting structure further comprises a primary side magnetic core, the receiving structure further comprises a secondary side magnetic core, the transmitting structure is relatively located below the receiving structure, the primary side magnetic core is located between the DD-type transmitting coil and the solenoid-type transmitting coil on the lower side, and the secondary side magnetic core is located between the DD-type receiving coil and the solenoid-type receiving coil on the upper side.
4. A self-decoupling coupling mechanism as claimed in claim 2 or claim 3, wherein:
the DD-type transmitting coil and the DD-type receiving coil adopt square DD-type coils, and the side length of the DD-type coils is D 1 The distance between the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil and the DD-type transmitting coil edge is D 2 The distance between the first solenoid-type transmitting sub-coil and the second solenoid-type transmitting sub-coil is D 3 The first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is at a distance D from the DD type receiving coil edge 4 The distance between the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 5 The width of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is D 6 The width of the first solenoid type receiving sub-coil or the second solenoid type receiving sub-coil is D 7 The number of turns of the DD type transmitting coil is N 11 The number of turns of the first solenoid-type transmitting sub-coil or the second solenoid-type transmitting sub-coil is N 12 The number of turns of the DD receiving coil is N 21 The number of turns of the first solenoid-type receiving sub-coil or the second solenoid-type receiving sub-coil is N 22 D is then 1 、D 2 、D 3 、D 4 、D 5 、D 6 、D 7 、N 11 、N 12 、N 21 、N 22 The method comprises the following steps of:
determining the dimension D of the coupling mechanism according to the actual requirement 1 Determining a transmission distance D according to actual requirements;
according to the system inM with reasonable configuration of required transmission power and required transmission efficiency at transmission distance D 11 And M 22 ，M 11 Representing the mutual inductance between the DD-type transmitting coil and the DD-type receiving coil, M 22 Representing a mutual inductance between the solenoid-type transmitting coil and the solenoid-type receiving coil;
determination of turns N by simulation 11 、N 12 、N 21 、N 22 ；
Determining D from offset requirements 2 、D 4 ；
According to D 6 ＝N 12 *(r+d)、D 7 ＝N 22 * (r+d) determination of D 6 、D 7 R is the wire diameter of the coil, d is the wire distance, and r and d are determined according to actual requirements;
according to D 3 ＝D 1 -(2*D 6 )、D 5 ＝D 1 -(2*D 7 ) Determining D 3 、D 5 。
5. The self-decoupling coupling mechanism of claim 4, wherein:
the DD-type transmitting coil is connected with the primary LCC-type compensation network to be used as a first primary resonance circuit together, the solenoid-type transmitting coil is connected with the primary compensation capacitor to be used as a second primary resonance circuit together, and the first primary resonance circuit is connected with the second primary resonance circuit in parallel;
the DD-type receiving coil is connected with the secondary side compensation capacitor to be used as a first secondary side resonance circuit together, the solenoid-type receiving coil is connected with the secondary side LCC-type compensation network to be used as a second secondary side resonance circuit together, and the first secondary side resonance circuit is connected with the second secondary side resonance circuit in series.
6. The self-decoupling coupling mechanism of claim 5, wherein: the series compensation inductance in the primary LCC type compensation network is denoted as L f1 The series compensation inductance in the secondary LCC type compensation network is denoted as L f2 ，L f1 、L f2 Determined by the following formula:
wherein U is p Represents the inversion output voltage of the system transmitting end, U o Representing the rectified input voltage at the receiving end of the system.
7. An anti-migration IPT system comprising a self-decoupling coupling according to any one of claims 1 to 6 wherein: the device comprises a transmitting end and a receiving end; the transmitting end comprises a direct-current power supply, an inverter and a primary side resonant circuit, and the receiving end comprises a secondary side resonant circuit, a rectifying and filtering circuit and a load;
the primary side resonant circuit comprises a first primary side resonant circuit and a second primary side resonant circuit which are connected in parallel at the output end of the inverter, the first primary side resonant circuit comprises a first primary side compensation network and the DD-type transmitting coil which are connected, and the second primary side resonant circuit comprises a second primary side compensation network and the solenoid-type transmitting coil which are connected;
the secondary side resonance circuit comprises a first secondary side resonance circuit and a second secondary side resonance circuit which are connected in series with the rectifying and filtering circuit, the first secondary side resonance circuit comprises a first secondary side resonance network and the DD-type receiving coil which are connected, and the second secondary side resonance circuit comprises a second secondary side resonance network and the solenoid-type receiving coil which are connected.
8. An anti-offset IPT system constructed from a self-decoupling coupling as claimed in claim 7 wherein:
the first primary side compensation network adopts a primary side LCC type compensation network, and the second primary side compensation network adopts a primary side compensation capacitor;
the first secondary side compensation network adopts a secondary side compensation capacitor, and the second secondary side compensation network adopts a secondary side LCC type compensation network.
9. An anti-offset IPT system of self-decoupling coupling mechanisms as claimed in claim 8 wherein the parameters of the primary and secondary LCC type compensation networks are set by:
according to the mutual inductance M between the DD-type transmitting coil and the DD-type receiving coil 11 And a mutual inductance M between the solenoid-type transmitting coil and the solenoid-type receiving coil 22 And formula (VI)
Determining a series compensation inductance L in the primary LCC type compensation network f1 Series compensation inductance L in the secondary side LCC type compensation network f2 ；
And determining other parameters of the primary side LCC type compensation network and the secondary side LCC type compensation network according to the coordination relation.
10. An anti-offset IPT system constructed from a decoupling coupling as claimed in claim 9 wherein the primary and secondary side compensation capacitances are determined in accordance with a tuning formula.
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