CN210074889U - Wireless power transmission system with high anti-offset characteristic - Google Patents

Abstract

The utility model discloses a wireless power transmission system with high anti skew characteristic, including power, transmitting element P1, transmitting element P2, receiving element S1, receiving element S2, rectification filter circuit and load resistance that connect gradually. The transmitting unit P1 includes a transmitting coil T1 and an impedance unit Z01 connected in series, the transmitting unit P2 includes a transmitting coil T2 and an impedance unit Z02 connected in parallel, the receiving unit S1 includes a receiving coil R1 and an impedance unit Z03 connected in series, and the receiving unit S2 includes a receiving coil R1 and an impedance unit Z03 connected in parallelCoil R2 and impedance unit Z04. M mutual inductance is formed between the transmitting coil T1 and the receiving coil R1_vCoupling, the mutual inductance M between the transmitting coil T2 and the receiving coil R2_iAnd (4) coupling. Using mutual inductance M_vAnd M_iUnder the characteristic of simultaneous increase or simultaneous decrease under the deviation working condition, the output fluctuation caused by the change of the relative position of the transmitting coil and the receiving coil is reduced, and the stable output under the high deviation working condition is ensured.

Description

Wireless power transmission system with high anti-offset characteristic

Technical Field

The utility model relates to a wireless power transmission system belongs to the electric energy transform field.

Background

The non-contact power supply realizes wireless power supply by magnetic field coupling, namely, a non-contact transformer with completely separated primary and secondary sides is adopted to transmit electric energy by coupling of a high-frequency magnetic field, so that the primary side (power supply side) and the secondary side (power utilization side) are not physically connected in the energy transfer process. Compared with the traditional contact type power supply, the non-contact type power supply has the advantages of convenient and safe use, no spark and electric shock hazard, no dust deposition and contact loss, no mechanical abrasion and corresponding maintenance problems, suitability for various severe weathers and environments, convenient realization of automatic power supply and wide application prospect.

However, the relative position of the primary side and the secondary side of the non-contact transformer is changed, so that the parameters of the transformer are changed in a large range, the output fluctuation of a system and the transmission efficiency are obviously reduced, and the popularization and the application of the WPT technology are limited.

In order to improve the anti-offset capability of the wireless power transmission system, according to Mickel Budhia of Okland, John T.Boys, Grant A.Covic and Chang-Yu Huang, "Development of a Single-side Flux magnetic coupler for Electric Vehicle IPT steering Systems" IEEE Transactions on Industrial Electronics, vol.60, No.1, January 2013 proposes to superpose a third winding (Q winding for short) superposed with a secondary winding between two windings (DD winding for short) of a secondary side of a non-contact transformer, so as to reduce the lateral sensitivity of secondary output power, and better solve the problem that the transmission capability of the transformer is affected by an induction blind spot which is in a state of completely offsetting the incoming and outgoing during offset. However, the winding structure of the DDQ can only improve the output characteristics of the non-contact transformer under the condition of transverse dislocation, and the output characteristics of the winding structure of the DDQ still change greatly for the change of the vertical distance of the primary side and the secondary side (namely the change of the air gap). In consideration of the uncertainty of the air gap size before the primary side and the secondary side of the non-contact transformer and the misalignment condition in practical application, further research is still needed.

Chinese patent 201720241345.5, a voltage source and current source combined excitation non-contact conversion circuit, utilizes the characteristics that the output characteristic of a non-contact converter under the excitation of a constant voltage source is inversely proportional to the primary and secondary side coupling coefficients (mutual inductance) of a non-contact transformer and the output characteristic under the excitation of a constant current source is proportional to the primary and secondary side coupling coefficients (mutual inductance) of the non-contact transformer, combines and outputs the voltage source and the current source combined excitation, and reduces the system output fluctuation caused by the change of the mutual inductance.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in view of the above prior art, a wireless power transmission system with high offset resistance is provided, which effectively improves the stability of the output characteristics under the condition of variable coupling coefficients.

The technical scheme is as follows: a wireless power transmission system with high offset resistance comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2, a rectifying and filtering circuit and a load resistor;

the transmitting unit P1 comprises a transmitting coil T1 and an impedance unit Z01 connected in series;

the transmitting unit P2 comprises a transmitting coil T2, a series impedance unit Z02a and a parallel impedance unit Z02b, wherein the T2 is connected with the Z02a in series and then connected with the Z02b in parallel, or the T2 is connected with the Z02b in parallel and then connected with the Z02a in series;

the receiving unit S1 includes a receiving coil R1 and an impedance unit Z03 connected in series;

the receiving unit S2 comprises a receiving coil R2, a series impedance unit Z04a and a parallel impedance unit Z04b, wherein the R2 is connected with Z04a in series and then connected with Z04b in parallel, or the R2 is connected with Z04b in parallel and then connected with Z04a in series;

the impedance units Z01, Z03, Z02a and Z04a are conducting wires or single inductors or single capacitors or a combination of a plurality of inductors and capacitors in series and parallel;

the impedance units Z02 and/or Z04 are single inductors or single capacitors or a combination of a plurality of inductors and capacitors in series and parallel connection;

wherein: the power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1, the rectifying and filtering circuit and the load resistor are sequentially connected in series, and the transmitting coil T1 and the receiving coil R1 are connected through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R2 via mutual inductance M_iCoupling;

or the power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, the receiving unit S1 is connected with the receiving unit S2 in parallel and then sequentially connected with the rectifying and filtering circuit and the load resistor in series, and the transmitting coil T1 and the receiving coil R2 are connected through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R1 via mutual inductance M_iCoupling;

or the transmitting unit P1 and the transmitting unit P2 are connected in parallel and then powered by a power supply E, the receiving unit S2, the receiving unit S1, the rectifying and filtering circuit and the load resistor are sequentially connected in series, and the transmitting coil T1 and the receiving coil R2 are connected in series through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R1 via mutual inductance M_iCoupling;

or the transmitting unit P1 and the transmitting unit P2 are connected in parallel and then powered by a power supply E, the receiving unit S1 and the receiving unit S2 are connected in parallel and then sequentially connected in series with the rectifying and filtering circuit and the load resistor, and the transmitting lineThe coil T1 and the receiving coil R1 are mutually inducted by M_vCoupling between the transmitter coil T2 and the receiver coil R2 via mutual inductance M_iAnd (4) coupling.

Further, by setting the coil structures and phase positions of the transmitting coil T1, the transmitting coil T2, the receiving coil R1 and the receiving coil R2, no magnetic flux coupling or weak magnetic coupling exists between the transmitting coil T1 and the transmitting coil T2, between the transmitting coil T1 and the receiving coil R1, between the transmitting coil T2 and the receiving coil R1, and between the receiving coil R1 and the receiving coil R2 under the condition of no offset.

Has the advantages that: the utility model provides a wireless power transmission system with high anti skew characteristic, the key technology characteristics who compares with prior art are, adopt two transmitting coil, two receiving coil structures, utilize mutual inductance Mv and Mi under the skew operating mode with increasing, with the characteristic that reduces, the output voltage or the output current of establishing along with mutual non-monotonic change for when taking place the skew, the system still can have stable output voltage or output current under invariable input condition, the anti skew ability of system has been improved.

Drawings

FIG. 1 is a schematic diagram of a non-contact transformer structure;

FIG. 2 is a schematic diagram of a primary side structure of a first non-contact transformer structure;

FIG. 3 is a schematic diagram of a second non-contact transformer structure;

FIG. 4 is a schematic diagram of a non-contact transformer structure III;

FIG. 5 is a diagram of a non-contact transformer structure IV;

FIG. 6 is a schematic diagram of a fifth non-contact transformer structure;

FIG. 7 is a sixth schematic view of a non-contact transformer configuration;

FIG. 8 is a seventh schematic diagram of a non-contact transformer structure;

FIG. 9 is an eighth schematic diagram of a non-contact transformer configuration;

FIG. 10 is a diagram illustrating a structure of a non-contact transformer;

FIG. 11 is a circuit schematic of an embodiment;

FIG. 12 shows the output current gain per unit of a circuit according to an embodiment;

FIG. 13 is a schematic circuit diagram according to a second embodiment;

FIG. 14 is a calculation result of the output voltage gain per unit of the circuit shown in the second embodiment;

FIG. 15 is a schematic circuit diagram of a third embodiment;

FIG. 16 is a diagram of a fourth circuit according to the embodiment;

FIG. 17 is a schematic circuit diagram of an embodiment;

FIG. 18 is a six circuit schematic of an embodiment;

FIG. 19 is a circuit schematic of the seventh embodiment;

FIG. 20 is a schematic circuit diagram of an eighth embodiment of a series forward coupled inductor;

fig. 21 is a schematic circuit diagram of an example eight-coupled inductor with an isolated structure;

FIG. 22 is a schematic diagram of an exemplary eight-coupled inductor and contactless transformer winding integrated circuit;

FIG. 23 is a schematic circuit diagram of a nine-coupled inductor in a forward series connection according to an embodiment;

FIG. 24 is a circuit diagram of an integrated form of a nine-coupled inductor and a non-contact transformer winding according to an embodiment;

FIG. 25 is a schematic circuit diagram of an exemplary embodiment in which ten coupled inductors are connected in series in a forward direction;

FIG. 26 is a schematic circuit diagram of an isolated structure of a ten-coupled inductor according to an embodiment;

FIG. 27 is a schematic diagram of an integrated circuit of a ten-way coupled inductor and a winding of a contactless transformer according to an embodiment.

FIG. 28 is a schematic circuit diagram of an eleventh embodiment;

FIG. 29 is a diagram illustrating a twelfth circuit according to an embodiment;

FIG. 30 is a schematic circuit diagram of a thirteenth embodiment;

FIG. 31 is a circuit schematic of a fourteenth embodiment;

FIG. 32 shows the measurement results of the coupling coefficient and mutual inductance of the non-contact transformer used in the first and second test examples at different air gaps;

FIG. 33 is a graph of the output current measurements at different coupling coefficients and different load conditions for a test example one;

FIG. 34 is a graph of the output voltage measurements for different coupling coefficients and different load conditions for test example two;

fig. 35 is a schematic diagram of the topology of the wireless power transmission system with high offset resistance of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The utility model discloses a used transmitting element P1 of wireless power transmission system with high anti skew characteristic, transmitting element P2, receiving element S1, receiving element S2 is realized by the non-contact transformer, FIG. 1 is the schematic structure of non-contact transformer, the non-contact transformer comprises first transmitting coil 102, second transmitting coil 103, first receiving coil 202, second receiving coil 203, former limit magnetic core 101 and vice limit magnetic core 201. Fig. 1 is intended to illustrate the coil structure of the non-contact transformer, and the magnetic core used can be changed into other magnetic core shapes such as edge-extended magnetic core, array magnetic core, cross magnetic core, etc. without affecting the function.

Fig. 1 to 9 show nine types of structures of the non-contact transformer, respectively, and arrows shown in the drawings indicate directions of currents flowing through windings. Because the primary and secondary windings are symmetrical in structure, fig. 3-10 only show schematic diagrams of the primary winding structure of the non-contact transformer, and the non-contact transformer structure can be obtained corresponding to fig. 1.

As shown in fig. 1, the non-contact transformer includes, from top to bottom, a secondary core 201, a first receiving coil 202, a second receiving coil 203, an air gap, a first transmitting coil 102, a second transmitting coil 103, and a primary core 102, wherein the first transmitting coil 102 and the second transmitting coil 103 are orthogonally wound around a central region of the primary core, the first receiving coil 202 and the second receiving coil 203 are orthogonally wound around a central region of the secondary core, wherein the first transmitting coil 102 is composed of square coils 102A and 102B generating opposite magnetic fluxes, the direction of the magnetic flux generated by 102A is perpendicular to the paper surface and outward, the direction of the magnetic flux generated by 102B is perpendicular to the paper surface and inward, the second transmitting coil 103 is composed of square coils 103A and 103B generating opposite magnetic fluxes, the direction of the magnetic flux generated by 103A is perpendicular to the paper surface and outward, the direction of the magnetic flux generated by 103B is perpendicular to the paper surface and inward, a closure is formed as shown in fig. 2. The first receiving coil 202 is structurally symmetrical to the first transmitting coil 102, and the second receiving coil 203 is structurally symmetrical to the second transmitting coil 103. The first transmitting coil 102 is coupled with the first receiving coil 202 in the forward direction, the second transmitting coil 103 is coupled with the second receiving coil 203 in the forward direction, and two flux coupling channels are always present.

As shown in FIG. 2, the in-and-out magnetic fluxes generated by the first transmitting coil 102 coupled to the second transmitting coil 103 cancel each other out, there is no magnetic flux coupling between 103 and 102, and the mutual inductance M is₁Almost zero. Since the first receiving coil 202 and the first transmitting coil 102 are structurally symmetrical, and the second receiving coil 203 and the second transmitting coil 103 are structurally symmetrical, there is no magnetic flux coupling between the receiving coils 202 and 203, and the mutual inductance M is₂Is also zero; similarly, in the case of the core right alignment, the magnetic flux generated by the second transmitter coil 103 coupled to the first receiver coil 202 is completely cancelled, the magnetic flux generated by the first transmitter coil 102 coupled to the second receiver coil 203 is completely cancelled, and the mutual inductance M is₃And M₄Are all zero. Since the relative positions of the first transmitting coil 102 and the second transmitting coil 103 and the first receiving coil 202 and the second receiving coil 203 are always kept unchanged during the shifting process, the mutual inductance M₁And M₂Is always zero.

When the primary side is fixed and the secondary side of the non-contact transformer deviates in the + Z direction, the magnetic core of the primary side and the secondary side are still opposite and have mutual inductance M₁、M₂、M₃And M₄Are all zero; the first transmitting coil 102 and the first receiving coil 202 are coupled in the forward direction, and the second transmitting coil 103 and the second receiving coil 203 are coupled in the forward direction, but the magnetic resistance of the magnetic circuit corresponding to the coupling magnetic flux is increased due to the extension of the magnetic flux path, and the mutual inductance M is generated_i、M_vAre all reduced. Mutual inductance M when the secondary side of the non-contact transformer deviates in the X direction₁And M₂Zero, second transmission to which receive coils 202A, 202B are coupledThe magnetic flux generated by the coil 103 can not be completely offset, the directions of the magnetic fluxes generated by the coils 103 coupled by the coils 202A and 202B are the same, the acting areas are the same, and the effective magnetic flux of the second transmitting coil coupled by the first receiving coil 202 is zero because the coils 202A and 202B are connected in series in the forward direction, so that the mutual inductance M is realized₄Is zero; similarly, M can be found₃Also zero. When the X-direction deviation occurs, the magnetic resistance of the magnetic flux corresponding to the magnetic path of the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic resistance of the magnetic flux corresponding to the magnetic path of the second transmitting coil 103 and the second receiving coil 203 increase, and the area facing the windings decrease, resulting in the mutual inductance M_i、M_vAre all reduced. But the magnetic flux coupled by the coil 203 is offset in and out at the same time, so that the effective magnetic conduction area is greatly reduced, and further M is enabled to be_iThe falling trend is faster; as shown in fig. 1, the size of the coils 102 and 202 in the X direction is smaller than the size of the coils 103 and 203 in the X direction, so that the area of the first transmitting coil 102 facing the first receiving coil 202 is more reduced than the area of the second transmitting coil 103 facing the second receiving coil 203 when the coils are shifted in the X direction, and the ratio of length to width of the coils is reasonably set, so that the mutual inductance M can be made_i、M_vDecreasing with approximately equal magnitude.

Similar to the flux coupling characteristic in the X-direction offset, it can be found that the non-contact transformer shown in FIG. 1 has mutual inductance M in the Y-direction offset₁、M₂、M₃And M₄All are zero, mutual inductance M_i、M_vDecreasing with approximately equal magnitude.

Fig. 3 is a schematic diagram of a non-contact transformer structure for a wireless power transmission system with high anti-offset characteristics according to the present invention. The first transmitting coil 102 and the second transmitting coil 103 are orthogonally wound in the center area of the primary magnetic core, wherein the first transmitting coil 102 is composed of rectangular coils 102A and 102B which generate magnetic fluxes with opposite directions, the direction of the magnetic flux generated by 102A is perpendicular to the paper surface and faces outwards, the direction of the magnetic flux generated by 102B is perpendicular to the paper surface and faces inwards to form a closed state, the second transmitting coil 103 is composed of rectangular coils 103A and 103B which generate magnetic fluxes with opposite directions, the direction of the magnetic flux generated by 103A is perpendicular to the paper surface and faces outwards, and the direction of the magnetic flux generated by 103B is perpendicular to the paper surface and faces inwards to form a closed state. The coil structure is similar to that of fig. 1, except that the aspect ratio of the coil is different.

Fig. 4 shows a schematic diagram of a structure of a non-contact transformer used in the wireless power transmission system with high anti-offset characteristics according to the present invention. The first transmitting coil 102 is formed by rectangular coils 102A, 102B wound around the two core legs in the X direction and connected in series, and the second transmitting coil 103 is formed by rectangular coils 103A, 103B wound around the two core legs in the Y direction and connected in series, and the arrows shown in the figure indicate the direction of current flowing through the windings. Flux characteristics similar to those of FIG. 1, mutual inductance M when shifted in the X, Y, Z direction₁、M₂、M₃And M₄All are zero, mutual inductance M_i、M_vAre all reduced.

Fig. 5 is a schematic diagram of a structure of a non-contact transformer used in the wireless power transmission system with high anti-offset characteristics according to the present invention. A first transmitting coil 102 is wound vertically around the core in the Y-direction and a second transmitting coil 103 is wound vertically around the core in the X-direction, the arrows shown in the figure indicating the direction of current flow through the windings. The first transmitting coil 102 generates a magnetic flux to circulate along the path in the X direction, and is parallel to the second transmitting coil 103, and the effective magnetic flux generated by the coil 102 to which the coil 103 is coupled is zero, and the mutual inductance M is zero₁And the mutual inductance M3 is zero due to the symmetrical structure of the primary winding and the secondary winding. Under the condition of opposite magnetic cores, the direction of the magnetic flux generated by the first transmitting coil 102 is parallel to the second receiving coil 203, the direction of the magnetic flux generated by the second transmitting coil 103 is parallel to the first receiving coil, the coupling magnetic flux is zero, and the mutual inductance M is caused₃And M₄Are all zero. When the primary side is fixed and the secondary side of the non-contact transformer deviates in the + Z direction, the magnetic core of the primary side and the secondary side are still opposite and have mutual inductance M₁、M₂、M₃And M₄Are all zero; the first transmitting coil 102 and the first receiving coil 202 are coupled in the forward direction, and the second transmitting coil 103 and the second receiving coil 203 are coupled in the forward direction, but the magnetic resistance of the magnetic circuit corresponding to the coupling magnetic flux is increased due to the extension of the magnetic flux path, and the mutual inductance M is generated_i、M_vAre all reduced. Mutual inductance M when the secondary side of the non-contact transformer is shifted in the direction X, Y₁And M₂The magnetic flux generated by the first transmitting coil 102 flows in the X direction and is parallel to the receiving coil 203, and the magnetic flux generated by the second transmitting coil 103 flows in the Y direction and is parallel to the receiving coil 202, so that the mutual inductance M is zero₃、M₄Is zero. Meanwhile, the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic flux coupled between the second transmitting coil 103 and the second receiving coil 203 are increased corresponding to the magnetic resistance of the magnetic circuit and reduced facing area of the winding, resulting in mutual inductance M_i、M_vAre all reduced.

Fig. 6 is a schematic diagram showing a structure of a non-contact transformer used in the wireless power transmission system with high anti-offset characteristics according to the present invention. The first transmitting coil 102 is composed of coils 102A, 102B symmetrically distributed on both sides of the magnetic core along the Y direction, the coils 102A, 102B are vertically wound around the magnetic core along the X direction, the second transmitting coil 103 is composed of coils 103A, 103B symmetrically distributed on both sides of the magnetic core along the X direction, the coils 103A, 103B are vertically wound around the magnetic core along the Y direction, and the arrows shown in the figure indicate the direction of current flowing through the windings. The flux coupling characteristic is similar to that of FIG. 4, and the mutual inductance M is obtained when the offset occurs in the direction X, Y, Z₁、M₂、M₃And M₄All are zero, mutual inductance M_i、M_vAre all reduced.

Fig. 7 shows a sixth schematic diagram of a structure of a non-contact transformer used in the wireless power transmission system with high offset resistance of the present invention. The first transmitting coil 102 is formed by connecting two rectangular coils distributed on one diagonal of the rectangle in series, and the second transmitting coil 103 is formed by connecting two rectangular coils distributed on the other diagonal of the rectangle in series. By reasonably designing the overlapping area of the coil 102 and the coil 103, the magnetic flux generated by the transmitting coil 103 coupled with the transmitting coil 102 can be completely offset, and the mutual inductance M₁Is zero. Because the original secondary side structure is symmetrical, when the secondary side structure is dislocated in the Z direction, the mutual inductance M exists₁、M₂、M₃And M₄Are all zero. However, when the X-direction and Y-direction misalignment occurs, the mutual inductance M₁、M₂Still zero, but the flux generated by the transmitter coil 103 coupled by the receiver coil 202 cannot be cancelled out and the flux generated by the receiver coil 203 is coupledThe magnetic flux generated to the transmitting coil 102 cannot offset the mutual inductance, M₃And M₄All are not zero and are increased along with the increase of the dislocation distance; meanwhile, the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic flux coupled between the second transmitting coil 103 and the second receiving coil 203 are increased corresponding to the magnetic resistance of the magnetic circuit and reduced facing area of the winding, resulting in mutual inductance M_i、M_vAre all reduced. The core is not shown.

Fig. 8 is a schematic diagram of a structure seven of a non-contact transformer used in the wireless power transmission system with high offset resistance of the present invention. The arrows in the figure indicate the direction of the current in the windings. The first transmitting coil 102 is composed of rectangular coils 102A and 102B which generate magnetic fluxes with opposite directions, the direction of the magnetic flux generated by 102A is perpendicular to the paper surface and inwards, the direction of the magnetic flux generated by 102B is perpendicular to the paper surface and outwards, the first transmitting coil is closed, the second transmitting coil 103 is composed of rectangular coils 103A and 103B which generate magnetic fluxes with the same direction, and the directions of the magnetic fluxes generated by 103A and 103B are perpendicular to the paper surface and outwards. The magnetic fluxes generated by the transmitter coils 102 coupled to the transmitter coils 103A and 103B are completely cancelled out and in, and the mutual inductance M₁Is zero. Because the original secondary side structure is symmetrical, when the secondary side structure is dislocated in the Z direction, the mutual inductance M exists₁、M₂、M₃And M₄Are all zero. When the X-direction deviation occurs, the magnetic fluxes generated by the first transmitter coils 102 to which the receiver coils 203A and 203B are coupled completely cancel each other out, and the effective magnetic flux of the first transmitter coils to which the receiver coil 203 is coupled is zero, so that the mutual inductance M is caused₃Is zero; similarly, M can be found due to the symmetrical structure of the primary and secondary side₄Is also zero; meanwhile, the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic flux coupled between the second transmitting coil 103 and the second receiving coil 203 are increased corresponding to the magnetic resistance of the magnetic circuit and reduced facing area of the winding, resulting in mutual inductance M_i、M_vAre all reduced. When Y-direction deviation occurs, mutual inductance M_i、M_vThe magnetic flux generated by the coil 103 coupled with the coil 102 can be offset by reasonably designing the overlapping area of the coil 102(202) and the coils 103A (203A) and 103B (203B), and the mutual inductance M₃、 M₄Is zero.

Fig. 9 is an eight schematic diagram of the structure of the non-contact transformer used in the wireless power transmission system with high offset resistance of the present invention. The arrows in the figure indicate the direction of the current in the windings. The first transmitting coil 102 is composed of rectangular coils 102A and 102B which generate magnetic fluxes with opposite directions, the direction of the magnetic flux generated by 102A is perpendicular to the paper surface and faces inwards, the direction of the magnetic flux generated by 102B is perpendicular to the paper surface and faces outwards, a closed state is formed, and the second transmitting coil 103 is wound around the center of the first transmitting coil 102 in an overlapping mode. The magnetic fluxes generated by the transmitter coil 102 coupled to the transmitter coil 103 are completely cancelled out and in, and the mutual inductance M₁Is zero. Because the original secondary side structure is symmetrical, when the secondary side structure is dislocated in the Z direction, the mutual inductance M exists₁、M₂、 M₃And M₄Are all zero. When the Y-direction deviation occurs, the left half and the right half of the magnetic flux generated by the transmitter coil 102 coupled to the receiver coil 203 are separated, the total effective magnetic flux is zero, so that the mutual inductance M is zero₃Is zero, similarly, M can be found due to the symmetrical structure of the primary and secondary side₄Is also zero; meanwhile, the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic flux coupled between the second transmitting coil 103 and the second receiving coil 203 are increased corresponding to the magnetic resistance of the magnetic circuit and reduced facing area of the winding, resulting in mutual inductance M_i、M_vAre all reduced. When X-direction deviation occurs, mutual inductance M_i、M_vAll decrease, but the flux generated by the transmitter coil 102(103) to which the receiver coil 203(202) is coupled cannot be cancelled out and the mutual inductance M₃、M₄And gradually increases.

Fig. 10 is a schematic diagram of a structure nine of a non-contact transformer used in a wireless power transmission system with high offset resistance according to the present invention. The arrows in the figure indicate the direction of the current in the windings. The first transmitting coil 102 is wound above the second transmitting coil 103 in a stacked manner, the two coil parts are overlapped, and by designing the overlapping area of the two coils, the magnetic fluxes generated by the transmitting coil 102 coupled with the transmitting coil 103 can be completely offset in and out, and the mutual inductance M is₁Is zero. Because the original secondary side structure is symmetrical, when the secondary side structure is dislocated in the Z direction, the mutual inductance M exists₁、M₂、M₃And M₄Are all zero. The transmission to which the receive coil 203 is coupled in the event of a Y-direction shiftThe magnetic flux generated by the coil 102 has some in and some out, the total effective magnetic flux is zero, and the mutual inductance M₃Is zero, similarly, M is due to the symmetrical structure of the primary and secondary side₄Is also zero; meanwhile, the magnetic flux coupled between the first transmitting coil 102 and the first receiving coil 202, and the magnetic flux coupled between the second transmitting coil 103 and the second receiving coil 203 are increased corresponding to the magnetic resistance of the magnetic circuit and reduced facing area of the winding, resulting in mutual inductance M_i、M_vAre all reduced. When X-direction deviation occurs, mutual inductance M_i、M_vAll decrease, but the flux generated by the transmitter coil 102(103) to which the receiver coil 203(202) is coupled cannot be cancelled out and the mutual inductance M₃、M₄And gradually increases.

Based on the non-contact transformer structure shown in fig. 1, the working principle of the technical solution of the present invention can be further analyzed. Notably, the utility model discloses a wireless power transmission system with high anti skew characteristic requires at the skew in-process, mutual inductance M₁、M₂、 M₃And M₄Has a small value close to zero or equal to zero, only the mutual inductance M is present_i、M_vWhile M increases with the offset distance_v、M_iSame increase or same decrease, corresponding coupling coefficient k_v、k_iApproximately satisfying a linear relationship change, i.e. k_v≈ak_i+ b, a, b are constants. In the following embodiments, the contactless transformer structure and the circuit topology shown in fig. 1 can be freely combined.

The wireless power transmission system comprises a direct current voltage source, a high-frequency inverter, a resonance transformation unit, a rectification filter circuit R and a load R which are sequentially connected_L. For highlighting the utility model discloses a design is important, takes AC/AC resonance transform unit wherein to do the utility model discloses a research object. In order to improve the efficiency of the non-contact converter, the converter is generally designed to work near a resonance frequency point, the resonance inductance current is approximate to sine, and then a fundamental wave approximate analysis method can be adopted to replace all variables in the resonance network with fundamental wave components. Equating the output of high-frequency inverter to an AC voltage source

When the rectifier bridge is continuously conducted, the voltage and the current of the middle point of the bridge arm are always in phase, and the rectifier filter circuit is equivalent to a load resistor R_ESatisfy R_E＝8/π²R_L，R_EIs an equivalent load resistance, R_LIs a load resistor. The high-frequency inverter has many optional circuits including push-pull, half-bridge, full-bridge, etc., and the rectifying and filtering circuit R has many optional circuits including bridge rectification, full-wave rectification, half-wave rectification, current-doubling rectification, voltage-doubling rectification, etc.

The first embodiment is as follows:

fig. 11 is a circuit diagram showing a first embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rCapacitor C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises transmitting coils L connected in parallel_piAnd a resonance capacitor C_ppi(ii) a The receiving unit S1 includes series-connected receiving coils L_siAnd a resonance capacitor C_si(ii) a The receiving unit S2 includes a receiving coil L_svResonant capacitor C_spvAnd a resonant inductor L_rsWherein L is_svAnd C_spvConnected in parallel and then connected with L_rsAre connected in series. The power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, and the receiving unit S2 is connected with the receiving unit S1 in parallel and then supplies a load resistor R_EPower supply, transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonant, flowing through the transmitting coil L_pvCurrent ofIs constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀Downflow transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

And

respectively as follows:

further, the output current gain and the input impedance are respectively:

wherein,to output a current. k is a radical of_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model provides an output current gain is irrelevant with the load, and input impedance is pure resistance all the time. From the non-contact transformer structure shown in fig. 1, it can be found that the mutual inductance M occurs when the secondary side of the non-contact transformer deviates from the primary side_v、M_iThe trend of the change is the same. Taking the case of a shift in the + Z direction, M_v、M_iAre all reduced, correspondingly M_v/L_svIs decreased by L_pi/M_iCan be increased by reasonably designing the parameters of the transformer, so that

Is compensated for by an amount of increase of₀M_vThe reduction amount of the wireless power transmission system can realize constant current output in a certain deviation working condition, and the deviation resistance characteristic of the wireless power transmission system is improved.

Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_iv(k) representing the gain of the output current with a coupling coefficient of k, G_iv(k_e) I.e. k is k_eThe gain of the output current is per unit using a minimum value, in some cases

G_ivAnd k represents the output current gain after the time scale with the coupling coefficient k. Let a be 1 and b be 0, and take different k_eValue, a curve that the output current gain after per unit changes with the coupling coefficient can be drawn as shown in fig. 12, and it can be found that the output current gain after per unit changes non-monotonically with the coupling coefficient, changes smoothly near the extreme point, and then by designMay be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

When the coupling coefficient k is in the interval [ k ]_min，k_max]In internal variation, and k_e∈[k_min，k_max]Defining output current ripple

G_ivmax Is composed ofMaximum value of output current gain, G_ivmin Is composed ofIf the output current gain is minimum, the output current fluctuation ξ is found to be

G_iv(k_max) Is expressed as k ═ k_maxGain of output current of time, G_iv(k_min) Is expressed as k ═ k_minThe output current gain in time. The embodiment of the utility model provides a well resonant element parameter satisfies

Can be in the effective coupling coefficient interval [ k ]_min，k_max]Minimal output current ripple is achieved. The demonstration process is as follows:

the output current gain when the coupling coefficient is k can be expressed as

It is demonstrated that the condition for obtaining equal sign is satisfied at the same time, when G is_iv(k_max)＝G_iv(k_min) When there is

Example two:

fig. 13 is a circuit diagram showing a second embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rlCapacitor C_rInductor L_r2A LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piResonant capacitor C_ppi、C_psiAnd a resonant inductor L_srWherein the transmitting coil L_piAnd a capacitor C_psiConnected in series with the capacitor C_ppiConnected in parallel with the resonant inductor L_srAre connected in series; the receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 includes a receiving coil L_siResonant capacitor C_ssi、C_spiAnd a resonant inductor L_ssiWherein L is_siAnd C_ssiConnected in series and then connected with C_spiConnected in parallel with L_ssiAre connected in series. The emitting unit P1 and the emitting unit P2 are connected in parallel and then powered by the power supply E, and the receiving unit S2 and the receiving unit S1 are connected in parallel and then supply power to the load resistor R_EPower supply, transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_r1And C_rResonance, current flow

Is constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀Downflow transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

Andrespectively as follows:

further, the output voltage gain and the input impedance are respectively:

wherein,is the output voltage.

k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses output voltage gain of second embodiment is irrelevant with the load, and input impedance is pure resistance all the time. Let k_i＝ak_v+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k_e) I.e. k is k_eThe output voltage gain of the time, further, the output voltage gain is per unit by a maximum value, some

G_vvAnd k represents the output voltage gain after the time scale of the coupling coefficient is k. Let a be 1 and b be 0, and take different k_eValue, a curve that the output voltage gain after per unit changes with the coupling coefficient can be drawn as shown in fig. 14, and it can be found that the output voltage gain after per unit changes non-monotonically with the coupling coefficient, changes smoothly near the extreme point, and then k is reasonably designed_eValue, can be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Different from the first embodiment, the second embodiment of the present invention can achieve constant voltage output within a wide range of coupling coefficient and load variation.

When the coupling coefficient k is in the interval [ k ]_min，k_max]In internal variation, and k_e∈[k_min，k_max]Defining the output voltage fluctuation as

G_vvmaxTo output a maximum value of current gain, G_vvminFor the minimum value of the output current gain, the output voltage fluctuation ξ is determined from FIG. 14 as

G_vv(k_max) Is expressed as k ═ k_maxGain of output voltage of time, G_vv(k_min) Is expressed as k ═ k_minThe gain of the output voltage. The embodiment of the utility model provides a resonant element parameter satisfies in twoCan be in the effective coupling coefficient interval [ k ]_min，k_max]Minimal output voltage fluctuations are achieved. The demonstration process is as follows:

the gain of the output voltage when the coupling coefficient is k can be expressed as

Order to

G_vv(k) Representing the gain of the output voltage when the coupling coefficient is k;

it is demonstrated that the condition for obtaining the equal sign is satisfied simultaneously when H (k)_max)＝H(k_min) When there is

Where H (x) is expressed as the value of H where the coupling coefficient k is x.

Example three:

fig. 15 is a circuit diagram showing a third embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rResistance C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises transmitting coils L connected in parallel_piAnd a resonance capacitor C_ppi(ii) a The receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 includes parallel-connected receiving coils L_siAnd a resonance capacitor C_spi. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the load resistor R in series_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonant, flowing through the transmitting coil L_pvCurrent of

Is constant. When operating at resonant frequency ω₀While flowing through the transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

And

respectively as follows:

the output voltage gain and the input impedance are respectively:

wherein,

is the output voltage. k is a radical of_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of third embodiment is irrelevant with the load, and input impedance is pure resistance all the time. Will mutually induce M_v、M_iBy corresponding coupling coefficient k_v、k_iDenotes, let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k) representing the gain of the output voltage with a coupling coefficient of k, G_vv(k_e) I.e. k is k_eThe gain of the output voltage is per unit with a minimum value, some

G_vvAnd k represents the output current gain after the time scale of the coupling coefficient is k, and the expression of the gain is the same as that of the expression in the embodiment of the invention, and has similar external characteristics. By design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved. The embodiment of the utility model provides a three require transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svHas a self-inductance value of

Example four:

fig. 16 is a circuit diagram showing a fourth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rCapacitor C_rA LC resonance network; the transmitting unit P1 comprises a transmitting coil L_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piResonant capacitor C_psiAnd C_ppiWherein the transmitting coil L_piAnd a capacitor C_psiConnected in series and then connected with a capacitor C_ppiAre connected in parallel; the receiving unit S1 includes a receiving coil L_sv(ii) a ReceivingThe unit S2 includes a receiving coil L_siResonant capacitor C_spiAnd C_ssiWherein the receiving coil L_siAnd a capacitor C_ssiConnected in series and then connected with a capacitor C_spiAre connected in parallel. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the load resistor R in series_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonant, flowing through the transmitting coil L_pvCurrent of

Is constant. When operating at resonant frequency ω₀While flowing through the transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

And

respectively as follows:

the output voltage gain and the input impedance are respectively:

wherein,

is the output voltage.

k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of four is irrelevant with the load, and input impedance is pure resistance all the time. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k) representing the gain of the output current with a coupling coefficient of k, G_vv(k_e) I.e. k is k_eTime output voltage gain, different from the third embodiment, the fourth embodiment of the present invention provides a transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svThe self-inductance value of (A) is required to satisfy:

λ_p＝L_pv/L_pi，λ_s＝L_sv/L_si(33)

further, the gain of the output voltage is per unit by a minimum value, which includes

G_vvThe expression of the gain of the output voltage after the coupling coefficient is k is expressed, the expression of the gain of the output current after the voltage is one unit is the same, and the gain has similar external characteristics. It can be found that the output voltage gain after per unit changes non-monotonously with the coupling coefficient, and changes smoothly near the extreme point, and then through design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, the anti-offset characteristic of the wireless power transmission system is improved, and the constant voltage output is realized in a wider coupling coefficient change and load change range.

Example five:

fig. 17 is a circuit diagram showing a fifth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage sourceAnd an inductance L_rCapacitor C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piResonant capacitor C_psiAnd C_ppiWherein the transmitting coil L_piAnd a capacitor C_psiConnected in series and then connected with a capacitor C_piAre connected in parallel; the receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 includes a receiving coil L_siResonant capacitor C_spiAnd C_ssiWherein the receiving coil L_siAnd a capacitor C_ssiConnected in series and then connected with a capacitor C_spiAre connected in parallel. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the negative poleLoad resistor R_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonant, flowing through the transmitting coil L_pvCurrent of

Is constant. When operating at resonant frequency ω₀While flowing through the transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

And

respectively as follows:

the output voltage gain and the input impedance are respectively:

wherein,

in order to output the voltage, the voltage is,

k_v、k_iis a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of five is irrelevant with the load, and input impedance is pure resistance all the time. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k) representing the gain of the output voltage with a coupling coefficient of k, G_vv(k_e) I.e. k is k_eThe gain of the output voltage is per unit with a minimum value, some

G_vvThe expression of the gain of the output voltage after the coupling coefficient is k is expressed, the expression of the gain of the output current after the voltage is one unit is the same, and the gain has similar external characteristics. The output voltage gain after per unit is found to be nonmonotonic change along with the coupling coefficient and gentle change near the extreme point through reasonable design

May be in a given coupling coefficient interval k_min， k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Different from the fourth embodiment, the third embodiment and the fifth embodiment of the present inventionC_psi、C_ssiProvides design freedom for realizing minimum output voltage fluctuation, namely, the compensation capacitor C can be adjusted according to any non-contact transformer parameter_psi、C_ssiTo satisfy

Thereby realizing constant voltage output in a wide coupling coefficient and load variation range.

Example six:

fig. 18 is a circuit diagram showing a sixth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rCapacitor C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piAnd a resonance capacitor C_ppi、C_psi，L_piAnd C_psiConnected in series and then connected with C_ppiAre connected in parallel; the receiving unit S1 includes series-connected receiving coils L_siAnd a resonance capacitor C_si(ii) a The receiving unit S2 includes a receiving coil L_svResonant capacitor C_spv、C_spvAnd a resonant inductor L_rsWherein L is_svAnd C_ssvConnected in series and then connected with C_spvConnected in parallel with L_rsAre connected in series. The power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, and the receiving unit S2 is connected with the receiving unit S1 in parallel and then supplies a load resistor R_EPower supply, transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonant, flowing through the transmitting coil L_pvCurrent of

Is constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀Downflow transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent ofAndrespectively as follows:

wherein,

further, the output current gain and the input impedance are respectively:

wherein,

to output a current, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the condition of complete compensation, the present invention provides an output current gain andthe load is irrelevant, and the input impedance is always pure resistance. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_iv(k) representing the gain of the output current with a coupling coefficient of k, G_iv(k_e) I.e. k is k_eThe gain of the output current is per unit using a minimum value, in some cases

G_ivAnd k represents the output current gain after the time scale with the coupling coefficient k. The output current gain after per unit is the same as that of the first embodiment of the present invention, and then by design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Different from the first embodiment and the sixth embodiment of the present invention, the compensation capacitor C_psi、C_ssiProvides design freedom for realizing minimum output current fluctuation, namely, the compensation capacitor C can be adjusted according to any non-contact transformer parameter_psi、C_ssvTo satisfy

Therefore, constant current output is realized in a wider coupling coefficient and load variation range.

Example seven:

fig. 19 is a circuit diagram showing a seventh embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_r1Capacitor C_rInductor L_r2A LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piResonant capacitor C_ppiAnd a resonant inductor L_srWherein the transmitting coil L_piAnd a capacitor C_ppiConnected in parallel with the resonant inductor L_srAre connected in series; the receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 includes a receiving coil L_siResonant capacitor C_spiAnd a resonant inductor L_ssiWherein L is_siAnd C_spiConnected in parallel with L_ssiAre connected in series. The emitting unit P1 and the emitting unit P2 are connected in parallel and then powered by the power supply E, and the receiving unit S2 and the receiving unit S1 are connected in parallel and then supply power to the load resistor R_EPower supply, transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. L is_r1And C_rResonance, current flow

Is constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀Downflow transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svCurrent of

And

respectively as follows:

further, the output voltage gain and the input impedance are respectively:

wherein,

to output a voltage, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of seventh embodiment is irrelevant with the load, and input impedance is pure resistance all the time. Let k_i＝ak_v+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k) representing the gain of the output voltage with a coupling coefficient of k, G_iv(ke) is k ═ k_eThe output voltage gain of the time, further, the output voltage gain is per unit by a maximum value, some

G_vv(k) represents the output voltage gain after the coupling coefficient is k, and the expression is the same as that of the output voltage gain after the second unit in the embodiment of the present invention, and then the output voltage gain is obtained by design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Different from the second embodiment, when a ≈ 1, the seventh embodiment of the present invention requires the self-inductance L of the non-contact transformer winding_pv、L_pi、L_siAnd L_svApproximately satisfy

Can be in the effective coupling coefficient interval [ k_min，k_max]Minimal output voltage fluctuations are achieved.

Example eight:

fig. 20 and 21 are circuit configuration diagrams of an eighth embodiment of a wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_r1Capacitor C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 includes a coupling inductorT1 and a series-connected transmitting coil L_piResonant capacitor C_psi(ii) a The receiving unit S1 includes a coupling inductor T2 and a receiving coil L connected in series_siResonant capacitor C_ssi(ii) a The receiving unit S2 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S1, the receiving unit S2 and the load resistor R in series_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The coupling inductor T1 includes a self-inductance L₁、L₂And mutual inductance M₁₂The coupling inductor T2 includes a self-inductance L₃、L₄And mutual inductance M₃₄As shown in FIG. 20, L₁、L₂In series, L₁And a transmitting coil L_pvConnected in series, L₂And a transmitting coil L_piAre connected in series; l is₃、L₄In series, L₃And a receiving coil L_svConnected in series, L₄And a receiving coil L_siAre connected in series. As shown in FIG. 21, the coupled inductors T1 and T2 may also be isolated structures, L₁、L₂Without electrical connection, by mutual inductance M₁₂Realizing magnetic flux coupling; likewise, L₃、L₄Without electrical connection, by mutual inductance M₃₄And realizing magnetic flux coupling.

The resonant element parameters in the circuits shown in fig. 20 and 21 satisfy:

wherein, ω is₀Is the resonant frequency. L is_r1And C_rResonance, current flow

Is constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀The lower output voltage gain is:

wherein,

to output a voltage, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of eight is irrelevant with the load, and input impedance is pure resistance all the time, has similar external characteristics with embodiment five.

Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vv(k) representing the gain of the output voltage with a coupling coefficient of k, G_vv(k_e) I.e. k is k_eThe gain of the output voltage is per unit with a minimum value, some

G_vvThe expression of the gain of the output voltage after the coupling coefficient is k is the same as that of the gain of the output current after the unit according to the embodiment of the present invention, and then the gain is obtained by designing

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

In addition, windings L1 and L can be used_pvA winding L₂And L_piA winding L₃And L_svA winding L₄And L_siIntegration, achieving winding sharing, and reducing coil volume and weight, as shown in fig. 22. It is worth noting that here the transmitting coil L_pvAnd L_piReceiving coil L_svAnd L_siAll have magnetic flux coupling, the ends with the same name are represented by the letter' and the corresponding mutual inductance is M₁₂、M₃₄。

Example nine:

fig. 23 and fig. 24 are circuit diagrams showing a ninth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E is an AC voltage source

The transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 includes a coupling inductor T1 and a transmitting coil L connected in series_piResonant capacitor C_psi(ii) a The receiving unit S1 includes a coupling inductor T2 and a receiving coil L connected in series_siResonant capacitor C_ssi(ii) a The receiving unit S2 includes series-connected receiving coils L_svAnd a resonance capacitor C_spv. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S1, the receiving unit S2 and the load resistor R in series_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The coupling inductor T1 includes a self-inductance L₁、L₂And mutual inductance M₁₂Coupled inductorT2 includes self-inductance L₃、L₄And mutual inductance M₃₄As shown in FIG. 23, L₁、L₂In series, L₁And a transmitting coil L_pvConnected in series, L₂And a transmitting coil L_piAre connected in series. The parameters of the resonant element in the circuit satisfy that:

wherein, ω is₀Is the resonant frequency. The resonant frequency omega can be obtained according to the basic theory of the circuit₀The lower output current gain and input impedance are:

wherein,

to output a current, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output current gain of nine is irrelevant with the load, and input impedance is pure resistance all the time. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_iv(k) representing the gain of the output current with a coupling coefficient of k, G_iv(k_e) I.e. k is k_eThe gain of the output current is per unit by using the maximum value, some

G_ivThe expression of the gain of the output current after the coupling coefficient is k is the same as that of the gain of the output voltage after the second unit in the embodiment of the present invention, and then the gain is obtained by designing

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

In addition, the winding L can be used₁And L_pvA winding L₂And L_piA winding L₃And Lsv, winding L₄And L_siIntegration, achieving winding sharing, and reducing coil volume and weight, as shown in fig. 24. It is worth noting that here the transmitting coil L_pvAnd L_piReceiving coil L_svAnd L_siAll have magnetic flux coupling, the ends with the same name are represented by the letter' and the corresponding mutual inductance is M₁₂、M₃₄。

Example ten:

fig. 25 to 27 are circuit configuration diagrams of a tenth embodiment of a wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E comprises an AC voltage source

And an inductance L_rCapacitor C_rA LC resonance network; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 includes a coupling inductor T1 and a transmitting coil L connected in series_piResonant capacitorC_psi(ii) a The receiving unit S1 includes a coupling inductor T2 and a receiving coil L connected in series_siResonant capacitor C_ssi(ii) a The receiving unit S2 includes a receiving coil L_svResonant capacitor C_sv、C_qAnd a resonant inductor L_qWherein L is_svAnd C_svConnected in series and then connected with C_qConnected in parallel with L_qAre connected in series. The power supply E is sequentially connected with the transmitting unit P1, the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the load resistor R in series_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The coupling inductor T1 includes a self-inductance L₁、L₂And mutual inductance M₁₂The coupling inductor T2 includes a self-inductance L₃、L₄And mutual inductance M₃₄As shown in FIG. 25, L₁、L₂In series, L₁And a transmitting coil L_pvConnected in series, L₂And a transmitting coil L_piAre connected in series; l is₃、L₄In series, L₃And a receiving coil L_svConnected in series, L₄And a receiving coil L_siAre connected in series. As shown in FIG. 26, the coupled inductors T1 and T2 may also be isolated structures, L₁、L₂Without electrical connection, by mutual inductance M₁₂Realizing magnetic flux coupling; likewise, L₃、L₄Without electrical connection, by mutual inductance M₃₄And realizing magnetic flux coupling. The parameters of the resonant element in the circuit satisfy that:

wherein, ω is₀Is the resonant frequency. L is_rAnd C_rResonance, current flow

Is constant. The resonant frequency omega can be obtained according to the basic theory of the circuit₀The lower output current gain is:

wherein,

to output a current, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output current gain of ten is irrelevant with the load, and input impedance is pure resistance all the time.

Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and minimum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_iv(k) representing the gain of the output current with a coupling coefficient of k, G_iv(k_e) I.e. k is k_eThe gain of the output current is obtained by per unit using a minimum value of the gain of the output voltage

G_ivThe expression of the gain of the output current after the coupling coefficient is k is the same as that of the gain of the output current after the unit according to the embodiment of the present invention, and then the gain is obtained by designingMay be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Example eleven:

fig. 28 is a circuit diagram showing an eleventh embodiment of a wireless power transmission system having a high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and a load resistor R_E. The power supply E is an AC current source

Or obtained by alternating current voltage source and LC resonance network conversion; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 includes a coupling inductor T1, a resonant capacitor C1, and a transmitting coil L connected in series_piResonant capacitor C_psi(ii) a The receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 comprises a coupling inductor T2 and a resonant capacitor C₂And a receiving coil L connected in series_siResonant capacitor C_ssi. The emitting unit P1 and the emitting unit P2 are connected in parallel and then powered by the power supply E, and the receiving unit S2 and the receiving unit S1 are connected in parallel and then supply power to the load resistor R_EPower supply, transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The coupling inductor T1 includes a self-inductance L₁、L₂And mutual inductance M₁₂The coupling inductor T2 includes a self-inductance L₃、L₄And mutual inductance M₃₄，L₁And C₁Connected in series, L₃And C₂Connected in series, L₂And L_piConnected in series, L₄And L_siIn the series connection, as shown in FIG. 28, the coupling inductors T1 and T2 are of an isolated structure, L₁、L₂Without electrical connection, by mutual inductance M₁₂Realizing magnetic flux coupling; all in oneLikewise, L₃、L₄Without electrical connection, by mutual inductance M₃₄And realizing magnetic flux coupling. Coupled inductor structure, L, like that shown in FIG. 25₁And L₂、L₃And L₄It may also be connected in series in the forward direction.

The resonant element parameters in fig. 28 satisfy:

wherein, ω is₀Is the resonant frequency. The resonant frequency omega can be obtained according to the basic theory of the circuit₀The lower output voltage gain is:

wherein,

to output a voltage, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output voltage gain of eleven is irrelevant with the load, and input impedance is pure resistance all the time. Let k_i＝ak_v+b＝ak+b，a. b is constant, k is coupling coefficient, and maximum value point of output voltage gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_vi(k) representing the gain of the output voltage with a coupling coefficient of k, G_vi(k_e) I.e. k is k_eThe output voltage gain of the time, further, the output voltage gain is per unit by a maximum value, some

G_viThe expression of the gain of the output voltage after the coupling coefficient is k is the same as that of the output voltage after the second unit in the embodiment of the present invention, and then the gain is obtained by design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output voltage fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Example twelve:

fig. 29 is a circuit diagram showing a twelfth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2 and an equivalent load resistor R_E. The power supply E is an AC current source

Or obtained by alternating current voltage source and LC resonance network conversion; the transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises a coupling inductor T1 and a resonant capacitor C₁Transmitting coil L_piAnd a resonance capacitor C_psiWherein L is_piAnd C_psiAre connected in series; the receiving unit S1 includes a receiving coil L_svAnd a resonance capacitor C_ssv、C_spvWherein L is_svAnd C_ssvConnected in series with the capacitor C_spvAre connected in parallel; the receiving unit S2 includes series-connected receiving coils L_siAnd a resonance capacitor C_si. The emitting unit P1 and the emitting unit P2 are connected in parallel and powered by the power supply E, and the receiving unit S1, the receiving unit S2 and the load resistor R_EAre connected in series in sequence, transmitting lineRing L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

As shown in FIG. 29, the coupling inductor T1 includes a self-inductance L₁、L₂And mutual inductance M₁₂，L₁And C₁Connected in series, L₂And L_piSeries connection, coupling inductance T1 being of isolated construction, L₁、L₂Without electrical connection, by mutual inductance M₁₂And realizing magnetic flux coupling. The coupled inductor structure, L, given with reference to FIG. 25₁And L₂It may also be connected in series in the forward direction. Referring also to fig. 25, the reception side resonance capacitance C_spvBut may be replaced by a coupled inductor.

The resonant element parameters in fig. 29 satisfy:

wherein, ω is₀Is the resonant frequency. The resonant frequency omega can be obtained according to the basic theory of the circuit₀The lower output current gain is:

wherein,

to output a current, k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output current gain of twelve is irrelevant with the load, and input impedance is pure resistance all the time. Let k_i＝ak_v+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_ii(k) representing the gain of the output current with a coupling coefficient of k, G_ii(k_e) I.e. k is k_eThe gain of the output current is per unit by using the maximum value, some

G_iiThe expression of the gain of the output current after the coupling coefficient is k is the same as the gain of the output voltage after the second unit, which is the same as the gain of the output voltage after the second unit, according to the embodiment of the present invention

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

Example thirteen:

fig. 30 is a circuit diagram showing a thirteenth embodiment of the wireless power transmission system with high offset resistance according to the present invention. Comprising an alternating voltage sourceTransmitting unit P1, transmitting unit P2, receiving unit S1, receiving unit S2 and load resistor R_E. The transmitting unit P1 comprises a transmitting coil L_pv(ii) a The transmitting unit P2 comprises a transmitting coil L_piResonant capacitor C_psiAnd C_ppiWherein the transmitting coil L_piAnd a capacitor C_psiConnected in series and then connected with a capacitor C_ppiAre connected in parallel; receiving unit S1 comprises a receiving coil L_sv(ii) a The receiving unit S2 includes a receiving coil L_siResonant capacitor C_spiAnd C_ssiWherein the receiving coil L_siAnd a capacitor C_ssiConnected in series and then connected with a capacitor C_spiAre connected in parallel. Alternating current voltage source

Sequentially connected with the emitting unit P1 and the emitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the load resistor R_EAre sequentially connected in series, and the transmitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. The resonant frequency ω can be obtained according to the basic theory of the circuit₀At a corresponding winding current of

Wherein

Andrespectively, a flow-through transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svThe current of (2). Further, the present invention provides a thirteenth embodiment, wherein the output current gain and the input impedance are respectively:

wherein,

in order to output the current, the current is,

k_v、k_iis a mutual inductance M_v、M_iThe corresponding coupling coefficient. Under the complete compensation condition, the utility model discloses the output current gain of thirteen is irrelevant with the load, and input impedance is pure resistance all the time. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

further, the gain of the output current is per unit by using a maximum value, some

G_ivThe expression of the gain of the output current after the coupling coefficient is k time mark is the same as that of the gain of the output voltage after the second unit, the gain changes along with the non-monotonous change of the coupling coefficient, and the change is gentle near the extreme point, so that the gain of the output current after the second unit is realized by design

May be in a given coupling coefficient interval k_min，k_max]In addition, minimum output current fluctuation is realized, and radio is improvedThe anti-drift characteristics of the system can be transmitted.

The utility model discloses a transmitting coil L in embodiment thirteen_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svThe self-inductance value of (c) also requires that:

λ_p＝L_pv/L_pi，λ_s＝L_sv/L_si(85)

example fourteen:

fig. 31 is a circuit diagram illustrating a fourteenth exemplary embodiment of a wireless power transmission system with high offset resistance according to the present invention. Comprising an alternating voltage source

Transmitting unit P1, transmitting unit P2, receiving unit S1, receiving unit S2, rectifying and filtering circuit R and load resistor R_L. The transmitting unit P1 comprises a series connection of transmitting coils L_pvAnd a resonance capacitor C_pv(ii) a The transmitting unit P2 comprises transmitting coils L connected in parallel_piAnd a resonance capacitor C_ppi(ii) a The receiving unit S1 includes series-connected receiving coils L_svAnd a resonance capacitor C_sv(ii) a The receiving unit S2 includes parallel-connected receiving coils L_siAnd a resonance capacitor C_spi. Alternating current voltage source

Sequentially connected with the emitting unit P1 and the emitting unit P2 in series, the receiving unit S2, the receiving unit S1 and the load resistor RE in series, and the emitting coil L_pvAnd a receiving coil L_svBy mutual inductance M_vCoupling, transmitting coil L_piAnd a receiving coil L_siBy mutual inductance M_iAnd (4) coupling.

The resonant element parameters satisfy:

wherein, ω is₀Is the resonant frequency. When operating at resonant frequency ω₀In time, according to the basic theory of the circuit, the gain of the output current and the input impedance can be deduced to be respectively:

wherein,

to output a current k_v、k_iIs a mutual inductance M_v、M_iThe corresponding coupling coefficient. With the utility model discloses a winding current, output current gain that give in the embodiment thirteen are the same with the input impedance expression, then the utility model discloses an embodiment fourteen has similar performance with embodiment thirteen. Under the complete compensation condition, the utility model discloses the output current gain of fourteen is irrelevant with the load, and input impedance is pure resistance all the time. Let k_v＝ak_i+b＝ak+b，

a. b is constant, k is coupling coefficient, and maximum value point of output current gain and corresponding coupling coefficient k can be obtained_eComprises the following steps:

G_iv(k) representing the gain of the output current with a coupling coefficient of k, G_iv(ke) is k ═ k_eThe gain of the output current is per unit by using the maximum value, some

G_ivWhere (k) denotes the coupling coefficient as time scale kThe output current gain after the unit has the same expression as the output voltage gain after the unit is two, the gain changes along with the non-monotonic change of the coupling coefficient, the change is gentle near the extreme point, and the gain is obtained by design

May be in a given coupling coefficient interval k_min，k_max]And in addition, the minimum output current fluctuation is realized, and the anti-offset characteristic of the wireless power transmission system is improved.

The embodiment of the utility model provides a fourteen requires transmitting coil L_pvTransmitting coil L_piReceiving coil L_siAnd a receiving coil L_svHas a self-inductance value of

Can be in the effective coupling coefficient interval [ k_min，k_max]A minimum output current ripple ξ is achieved.

Test example one:

for verifying the feasibility of the utility model, take the wireless power transmission system that has high anti skew characteristic shown in fig. 23 as an example, adopt the non-contact transformer structure shown in fig. 1, carried out the experiment and verified. The following table shows the specific values of the primary and secondary side self-inductance and the compensation capacitance of the non-contact transformer used in the test when the air gap is 5 cm. Under different air gap distances, the mutual inductance and coupling coefficient curve of the non-contact transformer used in the test is shown in figure 32, and the mutual inductance M of the non-contact transformer structure I used in the utility model can be seen₁、M₂、M₃And M₄Always small, approximately zero, mutual inductance M_iAnd M_vDecreasing with approximately equal magnitude as the air gap spacing becomes larger.

Table 1: parameters of resonant elements

Input voltage V of the test_inIs 50V, resonant frequency f₀85kHz, then ω₀＝2πf₀The effective coupling coefficient interval is [0.117, 0.4 ]]The direct current output current that records under different air gap intervals is shown in fig. 33, can see out the utility model provides a wireless power transmission system with high anti skew characteristic can effectively improve the stability degree of non-contact power supply system output characteristic under the skew operating mode, keeps output voltage characteristic output stability under the variable load condition simultaneously, and in the coupling coefficient variation range of 3.4 times, output current fluctuation ξ is only 1.2.

Test example two:

in order to verify the feasibility of the present invention, the wireless power transmission system with high anti-deviation characteristics shown in fig. 18 is taken as an example, and the non-contact transformer structure shown in fig. 1 is adopted, so that experimental verification is performed. The following table shows the specific values of the primary and secondary side self-inductance and the compensation capacitance of the non-contact transformer used in the test when the air gap is 5 cm. Under different air gap distances, the mutual inductance and coupling coefficient curve of the non-contact transformer used in the test is shown in figure 32, and the mutual inductance M of the non-contact transformer structure I used in the utility model can be seen₁、M₂、M₃And M₄Always small, approximately zero, mutual inductance M_iAnd M_vDecreasing with approximately equal magnitude as the air gap spacing becomes larger.

Table 2: parameters of resonant elements

Input voltage V of the test_inIs 50V, resonant frequency f₀85kHz, then ω₀＝2πf₀The effective coupling coefficient interval is [0.117, 0.4 ]]The direct current output voltage that records under different air gap intervals is shown in fig. 34, can see out the utility model provides a wireless power transmission system with high anti skew characteristic can effectively improve the stability degree of non-contact power supply system output characteristic under the skew operating mode, keeps the output voltage characteristic simultaneously and becomes load conditionOutput stability, output voltage fluctuation ξ within 3.4 times of coupling coefficient variation range_vOnly 1.2.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A wireless power transfer system having high offset immunity, comprising: the power supply comprises a power supply E, a transmitting unit P1, a transmitting unit P2, a receiving unit S1, a receiving unit S2, a rectifying and filtering circuit and a load resistor;

the transmitting unit P1 comprises a transmitting coil T1 and an impedance unit Z01 connected in series;

the transmitting unit P2 comprises a transmitting coil T2, a series impedance unit Z02a and a parallel impedance unit Z02b, wherein the T2 is connected with the Z02a in series and then connected with the Z02b in parallel, or the T2 is connected with the Z02b in parallel and then connected with the Z02a in series;

the receiving unit S1 includes a receiving coil R1 and an impedance unit Z03 connected in series;

the receiving unit S2 comprises a receiving coil R2, a series impedance unit Z04a and a parallel impedance unit Z04b, wherein the R2 is connected with Z04a in series and then connected with Z04b in parallel, or the R2 is connected with Z04b in parallel and then connected with Z04a in series;

the impedance units Z01, Z03, Z02a and Z04a are conducting wires or single inductors or single capacitors or a combination of a plurality of inductors and capacitors in series and parallel;

the impedance units Z02 and/or Z04 are single inductors or single capacitors or a combination of a plurality of inductors and capacitors in series and parallel connection;

wherein: the power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, the receiving unit S2, the receiving unit S1, the rectifying and filtering circuit and the load resistor are sequentially connected in series, and the transmitting coil T1 and the receiving coil R1 are connected through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R2 via mutual inductance M_iCoupling;

or the power supply E is sequentially connected with the transmitting unit P1 and the transmitting unit P2 in series, the receiving unit S1 is connected with the receiving unit S2 in parallel and then sequentially connected with the rectifying and filtering circuit and the load resistor in series, and the transmitting coil T1 and the receiving coil R2 are connected through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R1 via mutual inductance M_iCoupling;

or the transmitting unit P1 and the transmitting unit P2 are connected in parallel and then powered by a power supply E, the receiving unit S2, the receiving unit S1, the rectifying and filtering circuit and the load resistor are sequentially connected in series, and the transmitting coil T1 and the receiving coil R2 are connected in series through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R1 via mutual inductance M_iCoupling;

or the transmitting unit P1 and the transmitting unit P2 are connected in parallel and then powered by a power supply E, the receiving unit S1 and the receiving unit S2 are connected in parallel and then sequentially connected in series with the rectifying and filtering circuit and the load resistor, and the transmitting coil T1 and the receiving coil R1 are connected in series through mutual inductance M_vCoupling between the transmitter coil T2 and the receiver coil R2 via mutual inductance M_iAnd (4) coupling.

2. The wireless power transmission system with high offset immunity as claimed in claim 1, wherein: by setting the coil structures and the phase positions of the transmitting coil T1, the transmitting coil T2, the receiving coil R1 and the receiving coil R2, no magnetic flux coupling or weak magnetic coupling exists between the transmitting coil T1 and the transmitting coil T2, between the transmitting coil T1 and the receiving coil R1, between the transmitting coil T2 and the receiving coil R1 and between the receiving coil R1 and the receiving coil R2 under the condition of no offset.

3. A wireless power transmission system with high offset immunity according to claim 1 or 2, wherein: the power supply E is an alternating current constant voltage source or an alternating current constant current source, or is formed by a direct current voltage source and a high-frequency inverter which are mutually connected, or is formed by a constant current source and an LC network; the alternating current constant current source E can be realized by a mode of alternating current constant voltage source and LC network conversion or control circuit.

4. A wireless power transmission system with high offset immunity according to claim 1 or 2, wherein: the coil structures of the transmitting coil T1, the transmitting coil T2, the receiving coil R1 and the receiving coil R2 are a single coil structure, a double coil structure, a multi-coil structure or a solenoid structure, and the primary side magnetic core and/or the secondary side magnetic core are U-shaped, I-shaped, edge-expanded type with the bottoms of two side columns expanded outwards along the side edges, cross-shaped or the combination of the structures.

5. The wireless power transmission system with high offset immunity as claimed in claim 4, wherein: the structures of the transmitting coil T1, the transmitting coil T2, the receiving coil R1 and the receiving coil R2 are planar structures or space structures.

6. The wireless power transmission system with high offset immunity as claimed in claim 5, wherein: and the wires of the transmitting coil and the receiving coil are solid wires, Litz wires, copper sheets, copper tubes or PCB windings.

7. A wireless power transmission system with high offset immunity according to claim 1 or 2, wherein: the impedance units Z02b and/or Z04b are coupled inductors.

Images