CN115985616A - Cross-connection distribution transmitting coil for wireless power transmission system segmented power supply - Google Patents
Cross-connection distribution transmitting coil for wireless power transmission system segmented power supply Download PDFInfo
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Abstract
The invention belongs to the field of wireless power transmission, particularly relates to a cross-connection distributed transmitting coil for wireless power transmission system segmented power supply, and aims to solve the problem of voltage fluctuation of a receiving coil at the cross-connection position of the receiving coil passing through a segmented transmitting coil. The invention comprises the following steps: a novel multi-transmitting-coil arrangement and assembly method is provided to eliminate or reduce the change of a transmitting-side magnetic field at the joint of different transmitting coils. Two solutions have been proposed based on the above conditions, the first solution being to cross-weave the cables of two adjacent rectangular transmitting coils on the adjacent common sides of the rectangles, and the second solution being to partially overlap the two transmitting coils at the junction. The arrangement and assembly method of the transmitting coil for the sectional power supply of the two wireless electric energy transmission systems can enhance the stability of the output voltage when the receiving coil passes through the partition area, and does not need to add equipment for voltage stabilization or carry out active voltage stabilization control.
Description
Technical Field
The invention belongs to the field of wireless power transmission, and particularly relates to a cross-connection distributed transmitting coil for sectionally supplying power for a wireless power transmission system.
Background
The wireless power transmission system applied to the rail transit vehicle has longer length of the transmitting coil due to longer power supply distance. When a single transmitting coil is adopted, the internal resistance loss of the coil is large, and the system efficiency is low. In order to reduce the loss of the transmitting coil, a scheme of segmented power supply of the transmitting coil can be adopted, and a plurality of transmitting coils with shorter lengths are adjacent in front and back to form a transmitting coil system. When the receiving coil of the wireless power transmission system is positioned in the transmitting area of one or more transmitting coils, only the transmitting coils in the corresponding area are electrified, and the rest transmitting coils are not electrified, so that the loss of the transmitting coils is reduced, and the system efficiency is improved.
The rectangular transmitting coil is simple in structure and convenient to manufacture, and is a common wireless power supply transmitting coil. When the multi-rectangular transmitting coil supplies power in a segmented mode, due to the fact that the outer layer of the transmitting cable is insulated to a certain thickness, when the insulating voltage of the cable is high and the insulating thickness is large, conductors of two adjacent rectangular coils cannot be attached tightly, and a certain gap exists. Compared with the magnetic field of the transmitting coil in the middle area of the rectangular coil, the magnetic field of the transmitting coil near the gap is greatly changed, so that the magnetic linkage captured by the receiving coil when the receiving coil moves to the position near the adjacent transmitting coil junction area is greatly changed, the induced voltage of the receiving coil is greatly fluctuated, and the power supply quality of the wireless power transmission system is reduced. In addition, when the transmitting cable is thick, an ideal right angle is difficult to wind, four corners of the actually manufactured rectangular coil have certain radians, common edges of the adjacent rectangular coils are difficult to completely attach, and received magnetic flux and induced voltage change when the receiving coil moves to a junction area of the adjacent transmitting coils.
In the prior art, in order to solve the receiving voltage fluctuation of a wireless power transmission system when passing through different sections of a transmitting coil, a DC/DC for outputting voltage stabilization can be added at a receiving end, the current of the transmitting coil can be dynamically adjusted, coils with special shapes and turns can be wound at the head and tail parts of the transmitting coil, and the like. The above method requires additional voltage stabilization equipment, a voltage stabilization control system or a voltage stabilization coil, increasing the cost and complexity of the system.
Disclosure of Invention
In order to solve the above problems in the prior art, namely the problem of voltage fluctuation of the receiving coil at the joint of the receiving coil passing through the segmented transmitting coil, the invention provides a cross-connection arrangement transmitting coil for segmented power supply of a wireless power transmission system, wherein the cross-connection arrangement transmitting coil comprises N rectangular transmitting coils;
the N rectangular transmitting coils are adjacent in the front and back direction, the plane where the N rectangular transmitting coils are located is parallel to the plane where the receiving coil is located, and the center line of the transmitting coil along the moving direction of the receiving coil is aligned with the center line of the receiving coil;
wherein the nth and (n + 1) th rectangular transmitting coils are connected by a first assembling method or a second assembling method.
In some preferred embodiments, the first assembling method is:
defining the long side of the rectangular coil as the rectangular side along the moving direction of the receiving plate, and the short side of the rectangular coil as the rectangular side vertical to the moving direction of the receiving plate;
and sequentially winding or laying two adjacent left and right rectangular transmitting coils, and tightly and crossly weaving a section of cable on the right short side of the left rectangular transmitting coil and a section of cable on the left short side of the right rectangular transmitting coil to form a common short side of the left and right rectangular transmitting coils.
In some preferred embodiments, when the system is in operation, the receiving coil is located above a transmitting coil, and the transmitting coil is energized with a high-frequency current:
when the distance from the receiving coil to the position above the end part of the transmitting coil from the position above the middle part of the transmitting coil is smaller than a set first threshold value, injecting high-frequency alternating current into the next transmitting coil along the moving direction of the receiving coil, wherein the amplitude, the frequency and the phase of the current are consistent with the current of the previous transmitting coil;
when the distance from the receiving coil to the area above the transmitting coil is larger than a set second threshold value, stopping injecting high-frequency current into the transmitting coil;
the second threshold is the distance between the next rectangular transmitting coil and the adjacent last rectangular transmitting coil in the moving direction of the receiving coil, which is required for eliminating the influence of the short side of the last rectangular transmitting coil adjacent to the next rectangular transmitting coil on the magnetic field of the receiving coil above the last rectangular transmitting coil, and the first threshold is the moving distance corresponding to the moving speed of the receiving coil and the time required by the current of the transmitting coil to reach the steady state plus the second threshold.
In some preferred embodiments, the second assembly method is:
each transmitting coil consists of two parallel straight line sections at the middle part and two bending sections at the two end parts;
the bending sections at the two end parts of the transmitting coil are semicircular arcs, circular arcs or other broken lines, and the width of the bending sections is not more than the center distance of two parallel straight-line sections of the transmitting coil at the middle part;
the area between two straightways of the transmitting coil is a straight line area of the transmitting coil, and the bending sections at two ends respectively enclose a left bending area and a right bending area.
In some preferred embodiments, when the system is in operation, the receiving coil is located above a transmitting coil, and the transmitting coil is energized with a high-frequency current:
when the distance from the receiving coil to the position above the end part of the transmitting coil from the position above the middle part of the transmitting coil is smaller than a set third threshold value, injecting high-frequency alternating current into the next transmitting coil along the moving direction of the receiving coil, wherein the amplitude, the frequency and the phase of the current are consistent with the current of the previous transmitting coil;
when the distance from the receiving coil to the area above the transmitting coil is larger than a set fourth threshold value, stopping injecting the high-frequency current into the transmitting coil;
the fourth threshold is a distance between the next transmitting coil and the adjacent previous transmitting coil in the moving direction of the receiving coil, which is required for eliminating the influence of a bent cable of the previous transmitting coil adjacent to the next transmitting coil on the magnetic field of the receiving coil above the previous transmitting coil, and the third threshold is the moving distance corresponding to the time required by the moving speed of the receiving coil and the current of the transmitting coil to reach the steady state plus the fourth threshold.
In some preferred embodiments, the nth and (n + 1) th rectangular transmitting coils have straight line areas which are flush;
the right bending area of the nth rectangular transmitting coil is partially overlapped with the left bending area of the (n + 1) th rectangular transmitting coil, and the overlapped area is called as an overlapped area;
keeping the bending area of one rectangular transmitting coil in the overlapping area flush with the linear area, and bending the bending area of the other rectangular transmitting coil in the overlapping area outwards along the direction far away from the plane of the receiving plate and then forwards along the direction parallel to the plane of the receiving plate;
the rectangular transmitting coil is bent outwards and forwards with the minimum bending radius allowed by the size and material of the transmitting cable.
In some preferred embodiments, the width of the overlapping region in the moving direction of the receiving plate has a value range larger than 0 and smaller than the span of a single bending region in the moving direction of the receiving plate;
and placing the receiving plate above the overlapping area, enabling the center of the receiving plate to coincide with the center of the overlapping area, injecting alternating current with the same amplitude, frequency and phase into the n-th and n + 1-th rectangular transmitting coils, and continuously adjusting the span of the overlapping area until the induction voltage of the receiving plate is measured to be the same as the induction voltage of the receiving plate when the receiving plate is completely placed in a straight line area, so as to obtain the width of the overlapping area.
Because the current of the adjacent transmitting coils is synchronous and consistent, the currents of the right bent cable of the left transmitting coil and the left bent cable of the right transmitting coil are equal in magnitude and opposite in direction, and the magnetic flux density formed by the two bent cables is mutually enhanced within an approximate closed loop area (overlapping area) formed by the two bent cables after the two bent cables are crossed so as to be larger than the magnetic flux density generated by the two parallel linear cables in the middle area of the transmitting coil. And the magnetic flux density formed by the two sections of bent cables on the outer side of the overlapping area along the moving direction of the receiving plate is mutually counteracted so as to be smaller than the magnetic flux density generated by the two parallel straight cables in the middle area of the transmitting coil.
The appropriate width of the overlapping area is determined by the method of the previous experiment and the like, and the receiving coil has a certain length, so that the sum of the magnetic flux generated by the transmitting coil in the overlapping area and the magnetic flux generated by the transmitting coil outside the overlapping area, which is captured by the receiving coil, is equal to the magnetic flux generated by two parallel linear cables of the transmitting coil when the receiving coil is positioned in the middle of the transmitting coil and far away from the bent cable. Thus, the magnetic flux of the receiving coil at the joint of the segment coils is basically the same as that of the magnetic flux of the receiving coil in the middle of the single coil, so that the induced voltage of the receiving coil can be kept stable.
In order to ensure the effectiveness of the scheme, the length of the receiving coil in the moving direction is not too short compared with the length of the bending area, so that the variation of the total magnetic flux of the receiving coil when the receiving coil cannot simultaneously cover a region with more magnetic flux inside the overlapping area and a region with less magnetic flux outside the overlapping area is reduced.
The invention has the beneficial effects that:
compared with the existing output voltage stabilization control scheme when the receiving coil crosses the transmitting coil segment, the two wireless power transmission system transmitting coil segment power supply schemes provided by the wireless power transmission system segment power supply cross-connection and arrangement transmitting coil can maintain or enhance the stability of the output voltage of the receiving coil only by arranging and installing the simplest multi-rectangular transmitting coil segment power supply scheme in a specified mode, no additional material or equipment is needed, no active output voltage stabilization control is needed, the system cost is reduced, and the system control is simplified.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a cable cross-braiding scheme for common edges of adjacent rectangular transmitting coils of a transmitting coil arranged in a sectionally power-supplying handover manner in a wireless power transmission system according to the present invention;
fig. 2 is a schematic diagram of a partially overlapping arrangement of adjacent transmit coils of a wireless power transfer system with a segmented power supply interface;
fig. 3 is a schematic diagram of the magnetic field distribution in the overlap region and the vicinity region of the partially overlapping scheme of adjacent transmitting coils of the wireless power transmission system in the sectional power supply arrangement;
where the arrows indicate the coil current direction, X indicates the flux going in perpendicular to the paper, ● indicates the flux going out perpendicular to the paper.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention relates to a cross-connection distribution transmitting coil for sectionally supplying power to a wireless power transmission system, which comprises N rectangular transmitting coils;
the N rectangular transmitting coils are adjacent in the front and back direction, the plane where the N rectangular transmitting coils are located is parallel to the plane where the receiving coil is located, and the center line of the transmitting coil along the moving direction of the receiving coil is aligned with the center line of the receiving coil;
wherein the nth and (n + 1) th rectangular transmitting coils are connected by a first assembling method or a second assembling method.
In order to more clearly describe the cross-coupled transmitting coil for the segmented power supply of the wireless power transmission system of the present invention, the following will describe each step in the embodiment of the present invention in detail with reference to the accompanying drawings.
The invention relates to a section-to-section connection arrangement and assembly mode for sectionally supplying power to a transmitting coil of a wireless power transmission system. The plane of the transmitting coil is parallel to the plane of the receiving coil, and the center line of the transmitting coil along the moving direction of the receiving coil is aligned with the center line of the receiving coil. The transmit coil and the receive coil may be, but are not limited to, both in a horizontal plane or both in a vertical plane.
As shown in fig. 1, a schematic diagram of a cable cross-braiding scheme for adjacent rectangular transmitting coils of the transmitting coils arranged in a cross-connection manner for supplying power in sections of the wireless power transmission system of the present invention defines a long side of a rectangular coil as a rectangular side along a moving direction of a receiving board, and a short side of the rectangular coil as a rectangular side perpendicular to the moving direction of the receiving board. And sequentially winding or laying two adjacent left and right rectangular transmitting coils, and tightly and crossly weaving a section of cable on the right short side of the left rectangular transmitting coil and a section of cable on the left short side of the right rectangular transmitting coil to form a common short side of the left and right rectangular transmitting coils.
Fig. 1 is further illustrated by taking the example where the transmitting coil and the receiving coil are placed on a horizontal plane.
When the system is operated, the receiving coil is positioned above a certain transmitting coil, and the transmitting coil is electrified with high-frequency current:
when the receiving coil moves from an upper position of a middle part of a certain transmitting coil to an upper position closer to an end part of the transmitting coil (the distance from the upper position of the middle part of the certain transmitting coil to the upper position of the end part of the transmitting coil is less than a set first threshold), high-frequency alternating current is injected into the next transmitting coil along the moving direction of the receiving coil, and the current amplitude, the frequency and the phase are consistent with the current of the previous transmitting coil.
First threshold value L 1 ＝d 1 +v*t on Wherein d is 1 D represents the distance between the former (i.e., short side) and the latter (i.e., receiving coil) in the moving direction of the receiving coil, which is required to substantially eliminate the influence of the short side of the next rectangular transmitting coil adjacent to the previous rectangular transmitting coil on the magnetic field of the receiving coil above the previous rectangular transmitting coil, and 1 typically greater than the short side length. v denotes the moving speed of the receiving coil, t on Indicating the time required for the transmit coil to start from the inverter to which it is connected until the transmit coil current reaches steady state.
And when the distance from the receiving coil to the area above the transmitting coil is larger than a set second threshold value, stopping injecting the high-frequency current into the transmitting coil. Second threshold value L 2 ＝d 1 。
The current direction of the adjacent transmitting coil at a certain moment is shown by the arrow in fig. 1. The current of the adjacent transmitting coils is consistent in magnitude and synchronous in phase, and the current of the two transmitting coil cables on the common edge of the adjacent transmitting coils is equal in magnitude and opposite in direction. Because the two transmitting cables are tightly crossed and woven, the resultant magnetomotive force of the two transmitting coil cables on the public side is almost zero. Therefore, the magnetic field formed by the long-side currents of the two coils can be regarded as being reserved at the joint of the two coils, the magnetic field formed by the short-side currents of the useless coils at the joint of the segmented transmitting coils is eliminated, the consistency of the transmitting magnetic fields along the lines of the multiple transmitting coils is kept, and the stability of the induced voltage of the receiving coil is improved.
The second wireless power transmission system transmitting coil section-to-section power supply section-to-section connection arrangement and assembly mode is that the transmitting coil comprises N transmitting coils, and the N transmitting coils are adjacent to each other in the front and back. The plane of the transmitting coil is parallel to the plane of the receiving coil, and the central line of the transmitting coil along the moving direction of the receiving coil is aligned with the central line of the receiving coil. The transmitting coil and the receiving coil may be, but are not limited to, both in a horizontal plane or both in a vertical plane, etc.
Fig. 2 is a schematic diagram of a partial overlapping scheme of adjacent transmitting coils of a transmitting coil arranged in a sectionally powered interfacing manner in a wireless power transmission system according to the present invention, and the transmitting coil and the receiving coil are placed on a horizontal plane for further explanation. Each transmitting coil is composed of two parallel straight line segments at the middle part and two bending segments at the two end parts. The bending sections of the two end parts can be semicircular arcs, circular arcs or other broken lines, and the like, but the width of the bending sections is not larger than the center distance of the two parallel straight line sections of the transmitting coil of the middle part. The area between two straightways of the transmitting coil is a straight line area of the transmitting coil, and the bending sections at two ends respectively enclose a left bending area and a right bending area. The bending section is exemplified by a semicircular arc, namely an arc radius R.
The straight line areas of the adjacent left and right transmitting coils are flush. The right bending region of the left transmitting coil is partially overlapped with the left bending region of the right transmitting coil, and the overlapped region is called as an overlapped region, as shown in fig. 2. In order to prevent the two coil cables from interfering when the bending regions of two adjacent transmitting coils are partially overlapped, the bending region of one transmitting coil in the overlapping region is kept flush with the linear region, and the bending region of the other transmitting coil in the overlapping region is bent outwards along the direction far away from the plane of the receiving plate and then bent forwards along the direction parallel to the plane of the receiving plate. The transmitting coil is bent outwards and forwards at the minimum bending radius allowed by the size and the material of the transmitting cable so as to reduce the distance between the plane of the bent area and the plane of the straight area to the greatest extent. In fig. 2, the right bending region and the straight region of the left side transmitting coil are in the same horizontal plane, and the part of the left bending region of the right side transmitting coil, which straddles into the overlapping region, is bent downwards and leftwards, so that the part of the left bending region of the right side transmitting coil, which is bent and positioned in the overlapping region, can be as close as possible to the part of the right bending region of the left side transmitting coil, which is positioned in the overlapping region.
The right bending area of the left transmitting coil and the left bending area of the right transmitting coil are partially overlapped to form an overlapping area, the width of the overlapping area in the moving direction of the receiving plate is W, and the value range of the width of the overlapping area is larger than 0 and smaller than the span of a single bending area in the moving direction of the receiving plate (in fig. 2, the span of the single bending area in the moving direction of the receiving plate is R). The specific value of the width of the overlapping area can be determined through experiments, and one process is to place a receiving plate above the overlapping area, coincide the center of the receiving plate with the center of the overlapping area, inject alternating current with consistent amplitude, frequency and phase into two adjacent transmitting coils, and continuously adjust the span W of the overlapping area until the measured induced voltage of the receiving plate is the same as the induced voltage of the receiving plate when the receiving plate is completely placed in a straight line area.
When the system is operated, the receiving coil is positioned above a certain transmitting coil, and the transmitting coil is electrified with high-frequency current:
and when the distance from the upper position of the middle part of the transmitting coil to the upper position of the end part of the transmitting coil by the receiving coil is less than a set third threshold value, injecting high-frequency alternating current into the next transmitting coil along the moving direction of the receiving coil, wherein the amplitude, the frequency and the phase of the current are consistent with those of the current of the previous transmitting coil.
Third threshold value L 3 ＝d 2 +v*t on In which d is 2 D represents the distance between the former (i.e. adjacent meander cable) and the latter (i.e. receiving coil) in the moving direction of the receiving coil, which is required to substantially eliminate the influence of the meander cable of the next transmitting coil adjacent to the previous transmitting coil on the magnetic field of the receiving coil above the previous transmitting coil, d 2 Typically greater than 2*R. v denotes the moving speed of the receiving coil, t on Indicating the time required for the transmit coil to start from the inverter to which it is connected until the transmit coil current reaches steady state.
And when the distance from the receiving coil to the area above the transmitting coil is larger than a set fourth threshold value, stopping injecting the high-frequency current into the transmitting coil. Fourth threshold value L 4 ＝d 2 。
Fig. 3 is a schematic view of magnetic field distribution in an overlapping area and a nearby area of a partial overlapping scheme of adjacent transmitting coils of the wireless power transmission system in a sectional power supply handover arrangement, where in an approximate closed loop area formed by partially overlapping a right bending section of a left transmitting coil and a left bending section of a right transmitting coil, that is, in the overlapping area, a right bending section cable of the left transmitting coil may determine, based on a direction of a current of the cable at the time and a position of the overlapping area relative to the cable, that magnetic flux generated by the section of cable in the overlapping area is in a vertical paper direction (denoted by X in fig. 3) by an ampere rule, and a left bending section cable of the right transmitting coil may determine, based on the direction of the current of the cable at the time and the position of the overlapping area relative to the cable, that magnetic flux generated by the section of cable in the overlapping area is also in the vertical paper direction, and it is seen that magnetic flux densities formed by the two bending cables in the overlapping area are mutually reinforced so as to be greater than magnetic flux densities generated mainly by two parallel straight-line cables in a middle area of the transmitting coil.
And the magnetic flux density formed by the two sections of bent cables is offset mutually outside the overlapping area along the moving direction of the receiving plate. Taking the left adjacent area as an example of the overlapping area in fig. 3 for magnetic field analysis, the right bent cable of the left transmitting coil can determine that the magnetic flux generated in the area by the cable is inward of the vertical paper (indicated by X in fig. 3) by ampere rule based on the direction of the current of the cable at that time and the position of the cable relative to the area, and the left bent cable of the right transmitting coil can determine that the magnetic flux density generated in the area by the cable is outward of the vertical paper (indicated by ● in fig. 3) by ampere rule based on the direction of the current of the cable at that time and the position of the cable relative to the area. It can be seen that outside the overlapping area in the moving direction of the receiving plate, the magnetic flux densities formed by the two bent cables cancel each other so as to be smaller than the magnetic flux density mainly generated by the two parallel straight cables in the middle area of the transmitting coil.
The appropriate width of the overlapping area is determined by the test method, and the receiving coil has a certain length, so that the sum of the larger magnetic flux generated by the transmitting coil in the overlapping area and captured by the receiving coil and generated by the transmitting coil outside the overlapping area is equal to the magnetic flux generated by two parallel linear cables of the transmitting coil and captured when the receiving coil is positioned in the middle of the transmitting coil and far away from the bent cable. Or the average magnetic flux density of adjacent transmitting coils in the vicinity of the area inside and outside the overlapping area is equal to the magnetic flux density generated by two parallel linear cables of the transmitting coils in the middle of the transmitting coils. The induced voltage of the receiver coil is also kept stable since the flux captured by the receiver coil at the intersection of the segment coils and in the middle of the single coil is substantially the same.
Those of skill in the art will appreciate that the various illustrative modules, method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that programs corresponding to the software modules, method steps may be located in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (7)
1. A wireless electric energy transmission system subsection power supply handover arrangement transmitting coil is characterized in that the handover arrangement transmitting coil comprises N rectangular transmitting coils;
the N rectangular transmitting coils are adjacent in the front and back direction, the plane where the N rectangular transmitting coils are located is parallel to the plane where the receiving coil is located, and the center line of the transmitting coil along the moving direction of the receiving coil is aligned with the center line of the receiving coil;
wherein the nth and (n + 1) th rectangular transmitting coils are connected by a first assembling method or a second assembling method.
2. The wireless power transfer system segmented power delivery interfacing transmission coil of claim 1, wherein said first assembly method is:
defining the long side of the rectangular coil as the rectangular side along the moving direction of the receiving plate, and the short side of the rectangular coil as the rectangular side vertical to the moving direction of the receiving plate;
and sequentially winding or laying two adjacent left and right rectangular transmitting coils, and tightly and crossly weaving a section of cable on the right short side of the left rectangular transmitting coil and a section of cable on the left short side of the right rectangular transmitting coil to form a common short side of the left and right rectangular transmitting coils.
3. The wireless power transfer system of claim 2, wherein the receiving coil is located above a transmitting coil that is energized with a high frequency current when the system is in operation:
when the distance from the receiving coil to the position above the end part of the transmitting coil from the position above the middle part of the transmitting coil is smaller than a set first threshold value, injecting high-frequency alternating current into the next transmitting coil along the moving direction of the receiving coil, wherein the amplitude, the frequency and the phase of the current are consistent with the current of the previous transmitting coil;
when the distance from the receiving coil to the area above the transmitting coil is larger than a set second threshold value, stopping injecting high-frequency current into the transmitting coil;
the second threshold is the distance between the next rectangular transmitting coil and the adjacent last rectangular transmitting coil in the moving direction of the receiving coil, which is required for eliminating the influence of the short side of the last rectangular transmitting coil adjacent to the next rectangular transmitting coil on the magnetic field of the receiving coil above the last rectangular transmitting coil, and the first threshold is the moving distance corresponding to the moving speed of the receiving coil and the time required by the current of the transmitting coil to reach the steady state plus the second threshold.
4. The wireless power transfer system sectionally powered interfacing transmit coil of claim 1, wherein said second assembling method comprises:
each transmitting coil consists of two parallel straight line sections at the middle part and two bending sections at the two end parts;
the bending sections at the two end parts of the transmitting coil are semicircular arcs, circular arcs or other broken lines, and the width of each bending section is not more than the center distance of two parallel linear sections of the transmitting coil at the middle part;
the area between two straight line sections of the transmitting coil is a straight line area of the transmitting coil, and the bending sections at two ends respectively enclose a left bending area and a right bending area.
5. The wireless power transfer system of claim 4, wherein the transmitter coil is arranged to receive power from a wireless power transfer system, and the receiver coil is located above the transmitter coil when the system is in operation, and the transmitter coil is energized with a high frequency current:
when the distance from the receiving coil to the position above the end part of the transmitting coil from the position above the middle part of the transmitting coil is smaller than a set third threshold value, injecting high-frequency alternating current into the next transmitting coil along the moving direction of the receiving coil, wherein the amplitude, the frequency and the phase of the current are consistent with the current of the previous transmitting coil;
when the distance from the receiving coil to the area above the transmitting coil is larger than a set fourth threshold value, stopping injecting high-frequency current into the transmitting coil;
the fourth threshold is a distance between the next transmitting coil and the adjacent previous transmitting coil in the moving direction of the receiving coil, which is required for eliminating the influence of a bent cable of the previous transmitting coil adjacent to the next transmitting coil on the magnetic field of the receiving coil above the previous transmitting coil, and the third threshold is the moving distance between the moving speed of the receiving coil and the time required for the current of the transmitting coil to reach the steady state plus the fourth threshold.
6. The wireless power transmission system segment power supply interfacing arrangement transmitting coil according to claim 3 or 5, wherein the n and n +1 rectangular transmitting coils have flush straight regions;
the right bending area of the nth rectangular transmitting coil is partially overlapped with the left bending area of the (n + 1) th rectangular transmitting coil, and the overlapped area is called as an overlapped area;
keeping the bending area of one rectangular transmitting coil in the overlapping area flush with the linear area, and bending the bending area of the other rectangular transmitting coil in the overlapping area outwards along the direction far away from the plane of the receiving plate and then forwards along the direction parallel to the plane of the receiving plate;
the rectangular transmitting coil is bent outwards and forwards with the minimum bending radius allowed by the size and material of the transmitting cable.
7. The wireless power transmission system sectional power supply handover arrangement transmitting coil according to claim 6, wherein the range of the width of the overlapping area in the moving direction of the receiving plate in the overlapping area is greater than 0 and less than the span of a single bending area along the moving direction of the receiving plate;
and placing the receiving plate above the overlapping area, enabling the center of the receiving plate to coincide with the center of the overlapping area, injecting alternating current with the same amplitude, frequency and phase into the n-th and n + 1-th rectangular transmitting coils, and continuously adjusting the span of the overlapping area until the induction voltage of the receiving plate is measured to be the same as the induction voltage when the receiving plate is completely placed in a straight line area, so as to obtain the width of the overlapping area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2022113741092 | 2022-11-03 | ||
| CN202211374109 | 2022-11-03 |
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| CN115985616A true CN115985616A (en) | 2023-04-18 |
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| CN202211614953.8A Pending CN115985616A (en) | 2022-11-03 | 2022-12-14 | Cross-connection distribution transmitting coil for wireless power transmission system segmented power supply |
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| CN (1) | CN115985616A (en) |
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2022
- 2022-12-14 CN CN202211614953.8A patent/CN115985616A/en active Pending
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