Wireless power transmission system based on active adjustment of coupling coefficient

Abstract

The application provides a wireless power transmission system based on active adjustment of a coupling coefficient, comprising two corresponding electromagnetic change modules, one of which is electrically connected with an input power supply, and the other is electrically connected with a load device; the electromagnetic change modules are correspondingly provided with feedback adjustment modules, which are used for adjusting equivalent electrical parameters of the two electromagnetic change modules and a coupling degree between the two electromagnetic change modules. The application has the beneficial effects that, based on the influence of high magnetic permeability material on equivalent electrical parameters of a coil, the relative positions of an electromagnetic change coil and an electromagnetic shielding plate are used to realize active adjustment of the coupling degree of an electromagnetic coupling mechanism, so that the influence of external factors on the coupling degree of the electromagnetic coupling mechanism is overcome or the requirements of the load on power transmission are met.

Description

Technical Field

[0001] This invention belongs to the field of wireless power transmission technology, and in particular relates to a wireless power transmission system based on active adjustment of coupling coefficient. Background Technology

[0002] In practical applications, various factors can cause changes in the coupling degree of the magnetic coupling mechanism in wireless power transmission systems, such as relative misalignment between the transmitter and receiver, or foreign object intrusion into the magnetic coupling mechanism. These factors can lead to fluctuations in the output power of wireless power transmission and system instability.

[0003] The current common approach is to add a conversion circuit at the load end to suppress system fluctuations caused by changes in the coupling coefficient and maintain a stable output. However, this method has the following problems: when the coupling coefficient changes significantly, the load-side conversion circuit needs a very wide power conversion range to meet the requirements, increasing the demands on circuit components and topology. Furthermore, the load-side conversion circuit cannot fully utilize its performance during normal operation, resulting in wasted performance and resources. Summary of the Invention

[0004] In view of this, the present invention aims to propose a wireless power transmission system based on active adjustment of coupling coefficient, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A wireless power transmission system based on active adjustment of coupling coefficient includes: two corresponding electromagnetic transformation modules, one of which is electrically connected to the input power supply, and the other is electrically connected to the load device.

[0007] The electromagnetic transformation module is equipped with a corresponding feedback adjustment module, which is used to adjust the equivalent electrical parameters of the two electromagnetic transformation modules and the coupling degree between the two electromagnetic transformation modules.

[0008] Furthermore, the electromagnetic transformation module includes an electromagnetic transformation coil and an electromagnetic shielding plate. The electromagnetic transformation coil and the electromagnetic shielding plate are respectively arranged. One electromagnetic transformation module is electrically connected to the input power supply, and the other electromagnetic transformation module is electrically connected to the load device.

[0009] At least one of the two electromagnetic transformation modules also includes an adjustment component, and the feedback adjustment module controls the adjustment component to adjust the relative position between the electromagnetic shielding plate and the electromagnetic transformation coil.

[0010] Furthermore, the two electromagnetic transformation modules are respectively the transmitting end electromagnetic transformation module and the receiving end electromagnetic transformation module;

[0011] The transmitting electromagnetic transformation module is electrically connected to the input power supply through a power supply-side conversion circuit. The power supply-side conversion circuit converts the electrical energy of the input power supply into high-frequency AC power required by the transmitting electromagnetic transformation module and the power supply-side dynamic compensation capacitor module.

[0012] Furthermore, the receiving electromagnetic transformation module is electrically connected to the load device through a load-side conversion circuit, which converts the high-frequency AC power output by the receiving electromagnetic transformation module into electrical energy suitable for the load device.

[0013] Furthermore, the electromagnetic transformation module is equipped with a corresponding compensation capacitor module, and the electromagnetic transformation module and the compensation capacitor module are connected in a manner that is not limited to series, parallel, or mixed connection.

[0014] Furthermore, the transmitting end electromagnetic change module is connected to a compensation capacitor module, which includes multiple capacitors connected in parallel, and each capacitor is connected in series with a switching switch.

[0015] Furthermore, the receiving end electromagnetic change module is connected to a compensation capacitor module, which includes multiple capacitors connected in parallel, and each capacitor is connected in series with a switching switch.

[0016] Furthermore, the feedback adjustment module changes the output capacitance value of the dynamic compensation capacitor module by adjusting the on / off state of each switching switch in the compensation capacitor module, so as to satisfy the change of equivalent electrical parameters of the transmitting end electromagnetic change module or the receiving end electromagnetic change module, and keep the system resonant frequency unchanged.

[0017] Furthermore, the adjustment component may be, but is not limited to, an electric cylinder, a pneumatic cylinder, or a slide module.

[0018] Furthermore, the adjustment component is an electric cylinder, the output shaft of the electric cylinder is fixedly connected to the electromagnetic shielding plate, the housing of the electric cylinder is fixedly connected to the electromagnetic conversion coil, and the feedback adjustment module is used to control the extension or retraction of the output shaft of the electric cylinder and adjust the relative position between the electromagnetic shielding plate and the electromagnetic conversion coil.

[0019] Compared with existing technologies, the wireless power transmission system based on active adjustment of coupling coefficient described in this invention has the following advantages:

[0020] The present invention discloses a wireless power transmission system based on active adjustment of coupling coefficient. Based on the influence of high permeability material on the equivalent electrical parameters of the coil, the system actively adjusts the coupling degree of the electromagnetic coupling mechanism by means of the relative position between the electromagnetic conversion coil and the electromagnetic shielding plate, thereby overcoming the influence of external factors on the coupling degree of the electromagnetic coupling mechanism or meeting the load's requirements for power transmission. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the power transmission system described in an embodiment of the present invention, in which both the receiving end and the transmitting end are equipped with adjustment components.

[0023] Figure 2 This is a schematic diagram of the structure of the power transmission system with an adjustment component at the transmitting end according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the power transmission system receiving end equipped with an adjustment component according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the electromagnetic change module structure according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram illustrating the influence of the relative distance between the electromagnetic change coil and the electromagnetic shielding plate on the equivalent electrical parameters of the electromagnetic change module when only the relative distance between the electromagnetic change module at the transmitting end or the electromagnetic change module at the receiving end is changed, as described in an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram illustrating the influence of the relative distance between the electromagnetic change coil and the electromagnetic shielding plate on the equivalent electrical parameters of the electromagnetic change module when the relative distance between the electromagnetic change module at the transmitting end and the electromagnetic change module at the receiving end is changed simultaneously, as described in an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the dynamic compensation capacitor module structure according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Input power supply; 21. Power supply side conversion circuit; 22. Load side conversion circuit; 3. Compensation capacitor module; 4. Active adjustment electromagnetic coupling mechanism; 41. Transmitter electromagnetic change module; 42. Receiver electromagnetic change module; 5. Feedback adjustment module; 6. Load device; 411. Electromagnetic conversion coil; 412. Electromagnetic shielding plate; 413. Adjustment component. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 7 As shown, a wireless power transmission system based on active adjustment of coupling coefficient includes: two corresponding electromagnetic transformation modules, one of which is electrically connected to the input power supply 1, and the other is electrically connected to the load device 6.

[0034] The electromagnetic transformation module is equipped with a corresponding feedback adjustment module 5, which is used to adjust the equivalent electrical parameters of the two electromagnetic transformation modules and the degree of coupling between the two electromagnetic transformation modules.

[0035] The electromagnetic transformation module includes an electromagnetic transformation coil 411 and an electromagnetic shielding plate 412. The electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 are arranged correspondingly. The two ends of the electromagnetic transformation coil 411 of one electromagnetic transformation module are electrically connected to the input power supply 1, and the two ends of the electromagnetic transformation coil 411 of the other electromagnetic transformation module are electrically connected to the load device 6.

[0036] At least one of the two electromagnetic transformation modules also includes an adjustment component 413. The feedback adjustment module 5 controls the adjustment component 413 to adjust the relative position between the electromagnetic shielding plate 412 and the electromagnetic transformation coil 411.

[0037] The two electromagnetic transformation modules are the transmitting electromagnetic transformation module 41 and the receiving electromagnetic transformation module 42, respectively.

[0038] The transmitting electromagnetic transformation module 41 is electrically connected to the input power supply 1 through the power supply side conversion circuit 21. The power supply side conversion circuit 21 converts the electrical energy of the input power supply 1 into the high-frequency AC power required by the transmitting electromagnetic transformation module 41 and the power supply side dynamic compensation capacitor module 3.

[0039] The receiving electromagnetic transformation module 42 is electrically connected to the load device 6 through the load-side transformation circuit 22. The load-side transformation circuit 22 converts the high-frequency AC power output by the receiving electromagnetic transformation module 42 into electrical energy suitable for the load device 6.

[0040] The transmitting electromagnetic transformation module 41 is connected to a compensation capacitor module 3. The compensation capacitor module 3 includes multiple capacitors arranged in parallel. One end of each capacitor is electrically connected to one end of the output terminal of the power supply side conversion circuit 21, and the other end is electrically connected to the other end of the output terminal of the power supply side conversion circuit 21 through a switching switch.

[0041] The receiving end electromagnetic transformation module 42 is connected to a compensation capacitor module 3. The compensation capacitor module 3 includes multiple capacitors arranged in parallel. One end of each capacitor is electrically connected to one end of the output terminal of the load-side transformation circuit 22, and the other end is electrically connected to the other end of the output terminal of the load-side transformation circuit 22 through a switching switch.

[0042] The feedback adjustment module 5 changes the output capacitance value of the dynamic compensation capacitor module 3 by adjusting the on / off state of each switching switch in the compensation capacitor module 3, so as to satisfy the change of equivalent electrical parameters of the transmitting electromagnetic change module 41 or the receiving electromagnetic change module 42, and keep the system resonant frequency unchanged.

[0043] The adjustment component 413 adopts, but is not limited to, existing electric cylinders, pneumatic cylinders, and slide modules. In this embodiment, the adjustment component 413 is an electric cylinder. The output shaft of the electric cylinder is fixedly connected to the electromagnetic shielding plate 412, and the housing of the electric cylinder is fixedly connected to the electromagnetic conversion coil 411. The feedback adjustment module 5 is used to control the extension or retraction of the output shaft of the electric cylinder and adjust the relative position between the electromagnetic shielding plate 412 and the electromagnetic conversion coil 411.

[0044] Adjusting the relative position between the electromagnetic shielding plate 412 and the electromagnetic conversion coil 411 can be done by adjusting the relative distance between the electromagnetic shielding plate 412 and the electromagnetic conversion coil 411, or by adjusting the projected area of ​​the electromagnetic shielding plate 412 on the electromagnetic conversion coil 411.

[0045] Work process:

[0046] like Figure 1 As shown in the diagram, both the receiving end and the transmitting end are equipped with adjustment components 413; Figure 2 As shown, the transmitting end is equipped with an adjustment component 413. Figure 3 The diagram shows a schematic of the structure of the receiving end equipped with an adjustment component 413.

[0047] like Figure 5 , Figure 6 As shown, the influence of the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 on the equivalent electrical parameters of the electromagnetic transformation module is as follows: When the wireless power transmission system based on active adjustment of coupling coefficient only includes the feedback adjustment module 5 on the power supply side or the feedback adjustment module 5 on the load side, that is, only the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 in the transmitting electromagnetic transformation module 41 or the receiving electromagnetic transformation module 42 can be changed, the equivalent self-inductance of the electromagnetic transformation module decreases continuously as the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 increases. The effect of the change in the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 on the equivalent self-inductance of the electromagnetic transformation module is stronger than that of the change in the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 when the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 does not change; the equivalent mutual inductance between the transmitting electromagnetic transformation module 41 and the receiving electromagnetic transformation module 42 decreases continuously as the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 increases.

[0048] like Figure 1As shown, when the wireless power transmission system based on active adjustment of coupling coefficient includes both the power supply side feedback adjustment module 5 and the load side feedback adjustment module 5, that is, when the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 in the transmitting end electromagnetic transformation module 41 and the receiving end electromagnetic transformation module 42 is changed simultaneously, the equivalent self-inductance of the transmitting end electromagnetic transformation module 41 and the receiving end electromagnetic transformation module 42 changes in the same way, and decreases continuously as the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 increases; the equivalent mutual inductance between the transmitting end electromagnetic transformation module 41 and the receiving end electromagnetic transformation module 42 decreases continuously as the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 increases. Figure 5 The impact on the equivalent mutual inductance corresponding to only changing the relative distance between the electromagnetic transformation coil 411 and the electromagnetic shielding plate 412 in the transmitting electromagnetic transformation module 41 or the receiving electromagnetic transformation module 42 is weaker than that on the transmitting electromagnetic transformation module 41 or the receiving electromagnetic transformation module 42. Figure 6 The equivalent mutual inductance corresponding to the relative distance between the electromagnetic conversion coil 411 and the electromagnetic shielding plate 412 in both the transmitting end electromagnetic conversion module 41 and the receiving end electromagnetic conversion module 42 is affected. Based on the influence of high permeability materials on the equivalent electrical parameters of the coil, the relative distance between the electromagnetic conversion coil 411 and the electromagnetic shielding plate 412 is used to actively adjust the coupling degree of the electromagnetic coupling mechanism, overcoming the influence of external factors on the coupling degree of the electromagnetic coupling mechanism or meeting the load's requirements for power transmission.

[0049] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0050] In the several embodiments provided in this application, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the division of units described above is merely a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The aforementioned units may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wireless power transfer system based on active adjustment of coupling coefficient, characterized in that, include: Two corresponding electromagnetic transformation modules are provided, one of which is electrically connected to the input power supply (1), and the other is electrically connected to the load device (6). The electromagnetic transformation module is provided with a corresponding feedback adjustment module (5), which is used to adjust the equivalent electrical parameters of the two electromagnetic transformation modules and the coupling degree between the two electromagnetic transformation modules; The electromagnetic transformation module includes an electromagnetic transformation coil (411) and an electromagnetic shielding plate (412). The electromagnetic transformation coil (411) and the electromagnetic shielding plate (412) are respectively arranged. One electromagnetic transformation module is electrically connected to the input power supply (1), and the other electromagnetic transformation module is electrically connected to the load device (6). At least one of the two electromagnetic transformation modules also includes an adjustment component (413), and the feedback adjustment module (5) controls the adjustment component (413) to adjust the relative position between the electromagnetic shielding plate (412) and the electromagnetic transformation coil (411).

2. The wireless power transmission system based on active coupling coefficient adjustment according to claim 1, characterized in that: The two electromagnetic transformation modules are the transmitting end electromagnetic transformation module (41) and the receiving end electromagnetic transformation module (42); The transmitting electromagnetic transformation module (41) is electrically connected to the input power supply (1) through the power supply side conversion circuit (21). The power supply side conversion circuit (21) converts the electrical energy of the input power supply (1) into the high-frequency AC power required by the transmitting electromagnetic transformation module (41) and the power supply side dynamic compensation capacitor module (3).

3. The wireless power transmission system based on active adjustment of coupling coefficient according to claim 2, characterized in that: The receiving end electromagnetic transformation module (42) is electrically connected to the load device (6) through the load-side transformation circuit (22). The load-side transformation circuit (22) converts the high-frequency AC power output by the receiving end electromagnetic transformation module (42) into electrical energy suitable for the load device (6).

4. The wireless power transmission system based on active adjustment of coupling coefficient according to claim 3, characterized in that: The electromagnetic transformation module is provided with a corresponding compensation capacitor module (3), and the electromagnetic transformation module and the compensation capacitor module (3) are connected in a manner that is not limited to series, parallel, or mixed connection.

5. A wireless power transmission system based on active adjustment of coupling coefficient according to claim 4, characterized in that: The transmitting end electromagnetic change module (41) is connected to a compensation capacitor module (3), which includes multiple capacitors connected in parallel, and each capacitor is connected in series with a switching switch.

6. A wireless power transmission system based on active adjustment of coupling coefficient according to claim 5, characterized in that: The receiving end electromagnetic change module (42) is connected to a compensation capacitor module (3), which includes multiple capacitors connected in parallel, and each capacitor is connected in series with a switching switch.

7. A wireless power transfer system based on active adjustment of coupling coefficient according to claim 6, characterized in that: The feedback adjustment module (5) changes the output capacitance value of the dynamic compensation capacitor module (3) by adjusting the on / off state of each switching switch in the compensation capacitor module (3), so as to satisfy the change of equivalent electrical parameters of the transmitting end electromagnetic change module (41) or the receiving end electromagnetic change module (42) and keep the system resonant frequency unchanged.

8. A wireless power transmission system based on active adjustment of coupling coefficient according to claim 1, characterized in that: The adjustment component (413) may be, but is not limited to, an electric cylinder, a pneumatic cylinder, or a slide module.

9. A wireless power transmission system based on active adjustment of coupling coefficient according to claim 1, characterized in that: The adjustment component (413) is an electric cylinder. The output shaft of the electric cylinder is fixedly connected to the electromagnetic shielding plate (412). The housing of the electric cylinder is fixedly connected to the electromagnetic conversion coil (411). The feedback adjustment module (5) is used to control the extension or retraction of the output shaft of the electric cylinder and adjust the relative position between the electromagnetic shielding plate (412) and the electromagnetic conversion coil (411).

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