CN110571947B - Multifunctional mode circuit and wireless power transmission system - Google Patents

Multifunctional mode circuit and wireless power transmission system Download PDF

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CN110571947B
CN110571947B CN201910987093.4A CN201910987093A CN110571947B CN 110571947 B CN110571947 B CN 110571947B CN 201910987093 A CN201910987093 A CN 201910987093A CN 110571947 B CN110571947 B CN 110571947B
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coil
primary
primary coil
connecting switch
external terminal
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CN110571947A (en
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钟文兴
叶宏峰
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Shanghai Eel Intelligent Technology Co ltd
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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
    • H01F27/288—Shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • 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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices

Abstract

The invention discloses a multifunctional mode circuit and a wireless power transmission coil, and belongs to the technical field of wireless power transmission. The multifunctional mode circuit comprises a wireless power transmission coil with M primary coils and M external terminals, wherein M is more than or equal to 2, the M primary coils are sequentially connected in series, a coil connecting switch is arranged between every two adjacent primary coils, two ends of each coil connecting switch are connected with the two adjacent external terminals through terminal connecting switches, and the M primary coils are respectively connected with the M external terminals in a one-to-one correspondence mode through compensating capacitors. The invention can realize various working modes by differently adjusting each switch, and can be used for adjusting the input impedance of wireless power transmission, so that the wireless power transmission can effectively realize the transmission of power within a large coupling range.

Description

Multifunctional mode circuit and wireless power transmission system
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a multifunctional mode circuit and a wireless power transmission system.
Background
As shown in fig. 1, the conventional wireless power transmission coil includes a primary structure and a secondary structure, wherein the primary structure includes a primary coil layer b1, a magnetic core layer b2 and an aluminum plate shielding layer b3, the secondary structure includes a secondary coil layer c1, a magnetic core layer c2 and an aluminum plate shielding layer c3, and the primary coil layer b1 includes a primary coil L1The secondary coil layer c1 includes a secondary coil L4. Table 1 lists the parameter details of the wireless power transmission coil in fig. 1 in a practical application scenario (where the inductance and mutual inductance are obtained by finite element simulation):
TABLE 1
Figure GDA0002700583970000011
FIG. 2 is a diagram of a conventional series-series compensated inductive wireless power transfer system in which a primary winding L is used1And a secondary winding L4Namely the primary coil L in the wireless power transmission coil1And a secondary winding L4. Wherein, capacitors C1 and C4 and coil L are connected in series1、L4A harmonic oscillator is formed at primary and secondary sides, i.e. the inductive reactance of coil and the capacitive reactance of corresponding series capacitorCancel each other out at the operating frequency of the system. Thus, the system can be represented by the following system of equations:
(R1+jX1)I1-jωMI4＝V1 (1)
jωMI1-(R4+RL+jX4)I4＝0 (2)
wherein, Xi(i-1, 4) is a resonance sub-coil (L)1、L4) Reactance ω L ofi-1/(ωCi)of resonator-i；LiIs the self-inductance of coil i; ciIs a series capacitor; riIs the resistance in the harmonic oscillator i branch; rLIs an equivalent load resistance; m is two coils L1、L4Mutual inductance of (2); ω is the operating angular frequency; i isiIs the current phasor for coil i; v1Is the phasor of the sinusoidal input voltage.
Fig. 3 is an architecture diagram of a series-series compensated inductive wireless power transfer system in practical application. Under an application scene, the rated power of the system is 3.3kW, the output direct current voltage is 400V, and the working frequency is 85 kHz. The system provides a primary coil harmonic oscillator with high-frequency alternating-current square waves through a direct current inverter (such as a high-frequency inverter), wherein the fundamental wave frequency of the square waves is the resonance frequency of the harmonic oscillator. The dc input to the inverter is typically provided by a single-phase boost PFC. The direct current input voltage is generally 400V, and the fundamental wave effective value of the inverted square wave is about 360V, which is the limiting condition of the system input voltage. Considering the current endurance capability of the coil and the inverter, the maximum effective value of the input current of the primary coil harmonic oscillator is 14A, so the output power of the system is about 5000 VA.
A big feature of the series-series compensation system is that the input impedance increases as the coupling increases, i.e., as the coupling increases, the input voltage needs to increase to reach the desired rated load, and as the coupling decreases, the input voltage needs to decrease to reach the desired rated load.
Fig. 4 a-4 b show the input voltage and input current (both ac effective values, acting on the primary coil resonator) required by the series-series compensation system outputting a 3.3kW rated load. It can be seen that under the limits of the given operating conditions, the maximum coupling coefficient is limited to 0.1505 by the maximum input voltage, while the minimum coupling coefficient is limited to 0.1 by the maximum input current. These two values correspond to the two primary coil air gaps in table 1, i.e., 175mm and 215 mm. That is, under practical operating conditions, the system can only transmit the electric energy of a rated load when the primary coil is opposite and the air gap is in the range of 175mm to 215 mm. However, in practical applications, such as wireless charging of electric vehicles, due to different vehicle models, the chassis height difference is large, and the air gap range of 40mm is difficult to meet the practical requirements.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a multifunctional mode circuit, so that the circuit can provide multiple operating modes, and when the circuit is applied to a wireless power transmission system, the input impedance of the wireless power transmission system can be adjusted by changing the operating mode of the circuit, so that the coupling range of the system is increased, and further, the air gap range of the system is increased, thereby increasing the application range of the system.
In order to achieve the above purpose, the invention provides the following technical scheme:
a multifunctional mode circuit is characterized by comprising a wireless power transmission coil with M primary coils and M external terminals, wherein M is more than or equal to 2, the M primary coils are sequentially connected in series, a coil connecting switch is arranged between every two adjacent primary coils, two ends of each coil connecting switch are connected with the two adjacent external terminals through terminal connecting switches, and the M primary coils are further connected with the M external terminals in a one-to-one correspondence mode through compensating capacitors.
In an embodiment of the present invention, the circuit includes a wireless power transmission coil having two primary coils and two external terminals, the two primary coils are a first primary coil and a second primary coil respectively, and the two external terminals are a first external terminal and a second external terminal respectively, where:
a first coil connecting switch is arranged between the first primary coil and the second primary coil, one end of the first coil connecting switch, which is connected with the second primary coil, is connected with the first external terminal through a first terminal connecting switch, and one end of the first coil connecting switch, which is connected with the first primary coil, is connected with the second external terminal through a second terminal connecting switch;
one end of the first primary coil, which is far away from the first coil connecting switch, is connected with the first external terminal through a first compensation capacitor, and one end of the second primary coil, which is far away from the first coil connecting switch, is connected with the second external terminal through a second compensation capacitor.
In one embodiment of the present invention, the wireless power transmission coil includes a primary side structure and a secondary side structure, wherein:
the primary structure comprises a first shielding layer, a first magnetic core layer and a primary coil layer which are sequentially stacked, wherein the primary coil layer comprises a first primary coil and a second primary coil, and the first primary coil is arranged around the second primary coil;
the secondary side structure comprises a second shielding layer, a second magnetic core layer and a secondary side coil layer which are sequentially stacked;
the primary coil layer and the secondary coil layer are arranged oppositely.
In an embodiment of the present invention, the circuit includes a wireless power transmission coil having three primary coils and three external terminals, the three primary coils are a first primary coil, a second primary coil and a third primary coil, and the three external terminals are a first external terminal, a second external terminal and a third external terminal, respectively, where:
a first coil connecting switch is arranged between the first primary coil and the second primary coil, and a second coil connecting switch is arranged between the second primary coil and the third primary coil;
one end of the first coil connecting switch, which is connected with the second primary coil, is connected with the first external terminal through a first terminal connecting switch, and one end of the first coil connecting switch, which is connected with the first primary coil, is connected with the second external terminal through a second terminal connecting switch;
one end of the second coil connecting switch, which is connected with the third primary coil, is connected with the second external terminal through a fourth terminal connecting switch, and one end of the second coil connecting switch, which is connected with the second primary coil, is connected with the third external terminal through a fifth terminal connecting switch;
one end of the first primary coil, which is far away from the first coil connecting switch, is connected with the first external terminal through a first compensation capacitor, and one end of the second primary coil, which is far away from the first coil connecting switch, is connected with the second external terminal through a second compensation capacitor; and one end of the third primary coil, which is far away from the second coil connecting switch, is connected with the third external terminal through a third compensation capacitor.
In one embodiment of the present invention, the wireless power transmission coil includes a primary side structure and a secondary side structure, wherein:
the primary structure comprises a first shielding layer, a first magnetic core layer and a primary coil layer which are sequentially stacked, wherein the primary coil layer comprises a first primary coil, a second primary coil and a third primary coil, the first primary coil is arranged around the second primary coil, and the second primary coil is arranged around the third primary coil;
the secondary side structure comprises a second shielding layer, a second magnetic core layer and a secondary side coil layer which are sequentially stacked;
the primary coil layer and the secondary coil layer are arranged oppositely.
In one embodiment of the present invention, the first and second shield layers are aluminum sheet shield layers.
In order to achieve the above object, the present invention further provides a wireless power transmission system, which includes the aforementioned multifunctional mode circuit.
Compared with the prior art, the invention has the positive improvement effects that:
the multifunctional mode circuit comprises a wireless power transmission coil with M primary coils and M external terminals, wherein M is more than or equal to 2, the M primary coils are sequentially connected in series, a coil connecting switch is arranged between every two adjacent primary coils, two ends of each coil connecting switch are connected with the two adjacent external terminals through terminal connecting switches respectively, and the M primary coils are connected with the M external terminals in a one-to-one correspondence mode through compensating capacitors respectively. Therefore, by adjusting the switch state of each switch, multiple working modes of the circuit are realized. When the circuit is applied to a wireless power transmission system, the input impedance of the wireless power transmission system can be adjusted by adjusting the working mode of the circuit, so that the coupling range of the wireless power transmission system is enlarged, the air gap range of the system is enlarged, and the application range of the system is enlarged.
Drawings
Fig. 1 is a structural view of a conventional wireless power transmission coil;
fig. 2 is a schematic circuit diagram of a conventional series-series compensated inductive wireless power transfer system;
fig. 3 is a diagram illustrating an actual architecture of a conventional series-series compensated inductive wireless power transfer system;
FIG. 4a is a graph of input voltage versus coupling coefficient required for the system of FIG. 3 to output rated power;
FIG. 4b is a graph of input current-coupling coefficient required for the system of FIG. 3 to output rated power;
FIG. 5 is a circuit diagram of one embodiment of a multifunction mode circuit of the present invention;
fig. 6 is a block diagram of one embodiment of a wireless power transfer coil of the present invention;
FIG. 7 is a circuit diagram of a wireless power transfer system employing the multi-mode circuit of the present invention;
FIG. 8 is a circuit diagram of a simulation of the system of FIG. 7 in an operating mode;
FIG. 9 is a schematic representation of the performance in the large air gap range;
FIG. 10 is a circuit diagram of another embodiment of a multifunction mode circuit of the present invention;
fig. 11 is a structural view of another embodiment of a wireless power transmission coil of the present invention.
Detailed Description
The multifunction mode circuit of the present invention will be described in detail with reference to fig. 5 to 11.
The invention relates to a multifunctional mode circuit which comprises a wireless power transmission coil with M primary coils and M external terminals, wherein M is more than or equal to 2, the M primary coils are sequentially connected in series, a coil connecting switch is arranged between every two adjacent primary coils, two ends of each coil connecting switch are respectively connected with the two adjacent external terminals through terminal connecting switches, and the M primary coils are respectively connected with the M external terminals in a one-to-one correspondence mode through compensating capacitors. Therefore, the circuit can be in a plurality of different working modes by adjusting the switching state of each switch.
In the embodiment shown in fig. 5, the aforementioned multi-mode circuit includes a wireless power transfer coil having two primary coils and two external terminals. Two primary coils are respectively a first primary coil L1And a second primary winding L2The two external terminals are a first external terminal a1 and a second external terminal a2, respectively. Wherein: first primary coil L1And a second primary coil L2A first coil connecting switch S is arranged between3And the first coil is connected with the switch S3And a second primary coil L2One end of the connection is connected with the switch S through the first terminal1Is connected to the first external terminal a 1; first coil connecting switch S3And the first primary coil L1One end of the connection is connected with the switch S through the second terminal2Connected to the second external terminal a 2. Furthermore, the first primary coil L1Away from switch S3Is connected to the first compensation capacitor C1A second primary coil L connected to the first external terminal a12Away from switch S3Is connected to the second compensating capacitor C2Connected to the second external terminal a 2. First compensation capacitor C1And a second compensation capacitor C2Are respectively a first primary coil L1And a second primary coil L2The resonant capacitance of (2).
In the present embodiment, three switches (S) are used1，S2，S3) Different working modes of the circuit can be realized by combining different switch states. Table 2 lists all possible operating modes, where "1" represents switch on and "0" represents switch off:
TABLE 2
Figure GDA0002700583970000061
As can be seen from the above table, eight operation modes can be realized by adjusting three switches (S1, S2, S3). The operation modes 2 to 7 may be used to adjust an input impedance of the wireless power transmission system, so that the wireless power transmission system may effectively implement power transmission in a large coupling range.
In this embodiment, the mechanical structure of the wireless power transmission coil includes a primary side structure and a secondary side structure. As shown in fig. 6, the primary structure includes a first shielding layer b3 (preferably an aluminum plate shielding layer), a first magnetic core layer b2 and a primary coil layer b1 stacked in this order from bottom to top, wherein the primary coil layer b1 includes the first primary coil L in fig. 51And a second primary winding L2And the first primary coil L1Around the second primary coil L2Setting; the secondary structure comprises a second shielding layer c3 (preferably an aluminum plate shielding layer), a second magnetic core layer c2 and a secondary coil layer c1 which are sequentially stacked from top to bottom, wherein the secondary coil layer c1 is formed by only one secondary coil L4Forming; in fig. 6, the primary coil layer b1 is disposed opposite the secondary coil layer c 1.
When the first primary coil L 19 turns of the second primary coil L2When the number of turns is 21 and other parameters of the wireless power transmission coil structure are the same as those in table 1, the coil L1、L2、L4The values of the self-inductance are shown in Table 3.
TABLE 3
175mm 140mm 110mm 75mm 40mm
L1 86.95 87.68 88.48 90.39 96.63
L2 257.3 259.7 264.4 279.8 338.7
L4 486.6 491.4 500.2 528.6 630.8
M12 71.26 72.25 73.95 79.18 96.42
M13 25.42 36.44 50.64 77.47 130.2
M23 48.20 72.28 105.1 171.4 315.5
Fig. 7 illustrates an embodiment of a wireless power transfer system that includes the aforementioned multi-function mode circuitry, as shown within the dashed box. With the first primary coil L 19 turns of the second primary coil L2The number of turns is 21, and other parameters of the wireless power transmission coil structure are as the example as shown in table 1, and by adjusting the switch in the multifunctional mode circuit, the following modes can be obtained:
the first mode is as follows: when (S)1,S2,S3) When equal to (0,0,1), the first primary coil L1And a second primary coil L2Working in series, i.e. equivalent to the conventional system of figure 2. As previously discussed, the air gap range for this mode to work properly is 175mm to 215 mm. In this operating mode, switch SSConducting and the rest are disconnected. CS、C1、C2In series, the total inductive reactance of the primary coil is compensated, namely:
Figure GDA0002700583970000071
wherein, C1、C2The calculation method of (2) is provided below; l is1、L2、M12The value should be within the range of air gap 175mm to 215mm, taking the value of air gap 215mm as an example, in combination with C obtained below1、C2A value of (A), can be calculated as CSWas 24.81 nF.
C4Calculated from the following formula:
Figure GDA0002700583970000072
wherein L is4The air gap is taken to be 215mm to improve the system efficiency at the farthest coupling position as much as possible. At this time, the capacitance C4It can be calculated to be 7.20 nF.
And a second mode: when (S)1,S2,S3) When equal to (1,0,0), the second primary coil L2Connected to an external circuit, a first primary coil L1In the off state, i.e. the second primary winding L2Work alone. Switch S in circuitaConducting and the rest are disconnected. The air gap for this mode to work normally ranges from 140mm to 175 mm. Second capacitor C2Calculated from the following formula:
Figure GDA0002700583970000081
wherein the second primary coil L2The air gap is 175mm to improve the system efficiency at 175 mm. Calculating to obtain C2Was 13.63 nF.
And a third mode: (S)1,S2,S3) (0,1,1) first primary coil L1Connected to an external circuit, a second primary winding L2Is in a self-resonant state. For other switches in the circuit, S2RConducting and the rest are disconnected. At this time, the first primary coil L1Has a compensation capacitance of C2R. The circuit for this mode can be described by the following system of equations:
(R1+jX1)I1+jωM12I2+jωM14I4＝V1 (6)
jωM12I1+(R2+jX2)I2+jωM24I1＝0 (7)
jωM14I1+jωM24I2+(R4+RL+jX4)I4＝0 (8)
wherein M isij(i＝1,2,4；j＝1,2,4；i>j) Is the mutual inductance between coil i and coil j, and the other variables define a mathematical model as in the conventional system described above.
From the above system of equations, the input impedance of the system can be solved and set to Zin. With C2RAs an unknown quantity, let ZinZero, the C required to achieve input voltage in phase with the input current can be solved2RThe value is obtained. R1、R2、R4The calculation can be carried out according to the existing finite element auxiliary calculation method, but the influence on the input impedance is small, and the calculation C2RIt may be set to zero. In some cases, an inductor rather than a capacitor is required in series to bring the input voltage into phase with the input current. This situation is illustrated in the last mode of operation.
Taking the self-inductance and mutual inductance value when the air gap is 140mm, and calculating the R1、R2、R4Set to zero, C can be calculated from the above method2R203.3 nF. The normal operating air gap range for this mode of operation is 110mm to 140 mm.
And a fourth mode: (S)1,S2,S3) The first primary coil L1 is connected to the external circuit, and the second primary coil L2 is in an off state, (0,1,0), that is, the first primary coil L1 operates alone. Circuit switch SaConducting and the rest are disconnected. The air gap range of the normal operation of the mode is 75mm to 110mm。C1Calculated from the following formula:
Figure GDA0002700583970000082
wherein L is1The value was taken at an air gap of 110 mm. Calculating to obtain C1Was 39.62 nF.
And a fifth mode: (S)1,S2,S3) (1,0,1) second primary coil L2Connected to an external circuit, a first primary coil L1Is in a self-resonant state. Other switches in the circuit, Sa、S1RConducting and the rest are disconnected. At this time, the inductance L1RAnd a second capacitor C2Is connected in parallel with the first primary coil L1Are connected in series. Similarly, this circuit can be described by the following agenda:
(R1+jX1)I1+jωM12I2+jωM14I4＝0 (10)
jωM12I1+(R2+jX2)I2+jωM24I1＝V1 (11)
jωM14I1+jωM24I2+(R4+RL+jX4)I4＝0 (12)
wherein the content of the first and second substances,
Figure GDA0002700583970000091
similarly, by combining the equations above, the L required to bring the input voltage and input current into phase can be solved1RThe value is obtained.
Taking the self-inductance and mutual inductance value when the air gap is 75mm, and calculating the value of R1、R2、R3Set to zero, L can be calculated by the above method1R18.55 μ H. The normal operating air gap range for this mode of operation is 40mm to 75 mm.
Each operating mode can be simulated and verified by using circuit simulation software, fig. 5 shows a mode five simulation circuit diagram, and other mode simulation diagrams are not listed. And (5) verifying the theoretical calculation results one by the simulation result.
Using the circuit shown in fig. 5, the ratio of the maximum output power to the rated power, the input voltage, the input current of the system after mode selection and switching at different distance ranges is shown in fig. 9. It can be seen that when the air gap is between 40mm and 215mm, the system can output 100% rated power under the limits of input voltage and input current, with only slight drops at 40mm and 75 mm. Whereas for the conventional system, i.e., mode one, the air gap range over which rated power can be output is only 175mm to 215 mm. Therefore, the multifunctional mode circuit of the invention can obviously increase the air gap range of the wireless power transmission system.
Further, it should be noted that, although not mentioned above (S)1,S2,S3) In (1,1,0) mode, i.e. the first primary winding L1And a first capacitor C1Formed branch and second primary coil L2And a first capacitor C2The branches are connected in parallel and then connected to an external circuit, but this does not mean that this mode is not useful, and in some applications, this mode can also be used to adjust the input impedance of the system.
FIG. 10 shows another embodiment of the multifunction mode circuit of the present invention. As shown in FIG. 10, the circuit includes a wireless power transmission coil having three primary coils L, which are the first primary coil L, and three external terminals1A second primary coil L2And a third original coil L3The three external terminals are a first external terminal a1, a second external terminal a2, and a third external terminal a3, respectively.
Wherein the first primary coil L1And a second primary coil L2A first coil connecting switch S is arranged between3Second primary winding L2And a third original coil L3A second coil connecting switch S is arranged between the first coil and the second coil6. First coil connecting switch S3And the second primary coil L2One end of the connection is connected with the switch S through the first terminal1Connected to a first external terminal a1, and a first coil connected to a switchS3And the first primary coil L1One end of the connection is connected with the switch S through the second terminal2Connected to the second external terminal a 2. Second coil connecting switch S6And a third original coil L3One end of the connection is connected with the switch S through the fourth terminal4Connected to a second external terminal a2, and a second coil connected to a switch S6And a second primary coil L2One end of the connection is connected with the switch S through a fifth terminal5And is connected to the third external terminal a 3. First primary coil L1Is far away from the first coil and is connected with the switch S3Is connected to the first compensation capacitor C1A second primary coil L connected to the first external terminal a12Is far away from the first coil and is connected with the switch S3Is connected to the second compensating capacitor C2Connected to the second external terminal a 2; third primary coil L3Is connected with the switch S far away from the second coil6Is connected to the first end of the first compensating capacitor C3And is connected to the third external terminal a 3.
In fig. 10, the multifunction mode circuit contains 6 switches, which can be viewed as a simple concatenation of two three-switch variable circuit topologies. The permutation and combination of 6 switches provides 64 connection possibilities, the operation modes corresponding to part of the connections are listed in table 4, and other connections have no practical significance and are not listed here.
TABLE 4
Figure GDA0002700583970000101
Figure GDA0002700583970000111
In this embodiment, the mechanical structure of the wireless power transmission coil includes a primary side structure and a secondary side structure. As shown in fig. 11, the primary structure includes a first shielding layer b3 (preferably an aluminum plate shielding layer), a first magnetic core layer b2 and a primary coil layer b1 stacked in this order from bottom to top, wherein the primary coil layer b1 includes the first primary coil L in fig. 101A second primary coil L2And a third original coil L3And the first primary coil L1Around the second primary coil L2Setting a second primary coil L2Around the third primary winding L3Setting; the secondary structure comprises a second shielding layer c3 (preferably an aluminum sheet shielding layer), a second magnetic core layer c2 and a secondary coil layer c1 which are stacked in sequence, wherein the secondary coil layer c1 consists of only one secondary coil L4Forming; in fig. 11, the primary coil layer b1 is disposed opposite the secondary coil layer c 1.
When the multifunctional mode circuit of this embodiment is applied to a wireless power transmission system, the air gap range of the wireless power transmission system can be increased, and the principle is similar to that of the first embodiment, which is not described herein again.
Preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without inventive faculty, e.g., the number of coils and the number of switches could be adjusted as desired. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (5)

1. A multifunctional mode circuit is characterized by comprising a wireless electric energy transmission coil with M primary coils and M external terminals, wherein M is 2 or 3, the M primary coils are sequentially connected in series, a coil connecting switch is respectively arranged between every two adjacent primary coils, two ends of each coil connecting switch are connected with the two adjacent external terminals through terminal connecting switches, and the M primary coils are respectively connected with the M external terminals in a one-to-one correspondence manner through compensating capacitors;
when M is 2, the circuit comprises a wireless power transmission coil with two primary coils and two external terminals, the two primary coils are respectively a first primary coil and a second primary coil, and the two external terminals are respectively a first external terminal and a second external terminal, wherein:
a first coil connecting switch is arranged between the first primary coil and the second primary coil, one end of the first coil connecting switch, which is connected with the second primary coil, is connected with the first external terminal through a first terminal connecting switch, and one end of the first coil connecting switch, which is connected with the first primary coil, is connected with the second external terminal through a second terminal connecting switch;
one end of the first primary coil, which is far away from the first coil connecting switch, is connected with the first external terminal through a first compensation capacitor, and one end of the second primary coil, which is far away from the first coil connecting switch, is connected with the second external terminal through a second compensation capacitor;
when M is 3, the circuit comprises a wireless power transmission coil with three primary coils and three external terminals, the three primary coils are respectively a first primary coil, a second primary coil and a third primary coil, and the three external terminals are respectively a first external terminal, a second external terminal and a third external terminal, wherein:
a first coil connecting switch is arranged between the first primary coil and the second primary coil, and a second coil connecting switch is arranged between the second primary coil and the third primary coil;
one end of the first coil connecting switch, which is connected with the second primary coil, is connected with the first external terminal through a first terminal connecting switch, and one end of the first coil connecting switch, which is connected with the first primary coil, is connected with the second external terminal through a second terminal connecting switch;
one end of the second coil connecting switch, which is connected with the third primary coil, is connected with the second external terminal through a fourth terminal connecting switch, and one end of the second coil connecting switch, which is connected with the second primary coil, is connected with the third external terminal through a fifth terminal connecting switch;
one end of the first primary coil, which is far away from the first coil connecting switch, is connected with the first external terminal through a first compensation capacitor, and one end of the second primary coil, which is far away from the first coil connecting switch, is connected with the second external terminal through a second compensation capacitor; and one end of the third primary coil, which is far away from the second coil connecting switch, is connected with the third external terminal through a third compensation capacitor.
2. The multi-function mode circuit of claim 1, wherein when M is 2, the wireless power transfer coil comprises a primary side structure and a secondary side structure, wherein:
the primary structure comprises a first shielding layer, a first magnetic core layer and a primary coil layer which are sequentially stacked, wherein the primary coil layer comprises a first primary coil and a second primary coil, and the first primary coil is arranged around the second primary coil;
the secondary side structure comprises a second shielding layer, a second magnetic core layer and a secondary side coil layer which are sequentially stacked;
the primary coil layer and the secondary coil layer are arranged oppositely.
3. The multi-function mode circuit of claim 1, wherein when M is 3, the wireless power transfer coil comprises a primary side structure and a secondary side structure, wherein:
the primary structure comprises a first shielding layer, a first magnetic core layer and a primary coil layer which are sequentially stacked, wherein the primary coil layer comprises a first primary coil, a second primary coil and a third primary coil, the first primary coil is arranged around the second primary coil, and the second primary coil is arranged around the third primary coil;
the secondary side structure comprises a second shielding layer, a second magnetic core layer and a secondary side coil layer which are sequentially stacked;
the primary coil layer and the secondary coil layer are arranged oppositely.
4. A multi-function mode circuit as claimed in claim 2 or 3, wherein the first and second shield layers are aluminium sheet shield layers.
5. A wireless power transfer system comprising a multi-function mode circuit as claimed in any one of claims 1 to 4.
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