Power pickup device based on energy flow track wireless power transmission system

Abstract

The invention discloses a power pickup device based on an energy flow track wireless power transmission system, and relates to the technical field of wireless power transmission. The device comprises a resonator module, a receiving end post-stage circuit and a ferrite base, the resonator module is electrically connected with the receiving end post-stage circuit through a lead, and the lead is fixed in a manner of directly penetrating through or bypassing the ferrite base; wherein the resonator module is composed of a plurality of resonators. According to the invention, traveling waves transmitted by an energy flow track can be cut off, and power energy is output to a post-stage circuit of a receiving end through magnetic coupling.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to a power pickup device based on a power flow track wireless power transmission system. Background Art

[0002] In recent years, dynamic wireless power transmission technology has gradually become a research hotspot to address the problem of battery life anxiety in sports equipment. The working principle of this technology is based on the common resonance of the energy transmitter and the energy receiver at the same frequency to achieve effective energy transfer between the two. On this basis, the industry has developed two main dynamic wireless power transmission energy transmission device structures: distributed multi-coil structure and long track coil structure. At the same time, energy receiving devices include parallel multi-coil structure and "DD" coil and other forms.

[0003] In the prior art, the transmitting end often uses a polar coil, whose magnetic field presents an NS alternating characteristic along the direction of movement. However, this structure will cause the energy receiving end to produce a periodic induced electromotive force zero point in the direction of movement, which will cause the problem of power transmission fluctuations. In order to deal with this problem, the industry has proposed solutions such as multi-phase compensation and high-order compensation circuits, but these methods undoubtedly increase the complexity of the entire system. Specifically, when a multi-phase compensation circuit is used to compensate for a distributed multi-coil structure, it is usually necessary to configure multiple sets of power supply end front-stage circuits, and each set of circuits can only control a limited number of transmitting end units to work, thereby limiting the effective distance of wireless power transmission. On the other hand, if a long track coil structure is used, the self-inductance of the transmitting end track will increase significantly, resulting in an increase in the voltage on the cable. To solve this problem, it is often necessary to reduce the operating frequency of the system, but this will lead to a decrease in system efficiency.

[0004] In response to the above challenges, a wireless power transmission system based on energy flow tracks came into being. The system adopts a new transmitter coil topology, which keeps the energy transmitter in a matching working state by loading the energy flow track load at the end of the energy extension direction. This design enables the energy flow track to transmit traveling waves and produce a uniform magnetic field distribution, while avoiding the use of high-order compensation structures and coil switching control systems, thereby simplifying the system topology. However, the traditional energy receiving end is not efficient in receiving energy transmitted by the energy flow track. Therefore, the research and development of a receiving device suitable for a wireless power transmission system based on an energy flow track and that can give full play to its advantages has become the focus of current research. Summary of the invention

[0005] The purpose of the present invention is to provide a power pickup device based on an energy flow track wireless power transmission system, which can cut off the traveling wave transmitted by the energy flow track and output power energy to the subsequent circuit of the receiving end through magnetic coupling.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A power pickup device based on an energy flow track wireless power transmission system, the energy flow track wireless power transmission system includes a power supply end, an energy flow track and a track end load, the power pickup device includes: a resonator module, a receiving end rear stage circuit and a ferrite base; the resonator module is electrically connected to the receiving end rear stage circuit through a lead, and the lead is fixed by directly passing through or bypassing the ferrite base; wherein the resonator module is composed of a plurality of resonators.

[0008] Optionally, when the number of the resonators is two, the center distance between the two resonators is set to be a quarter wavelength corresponding to the set operating frequency.

[0009] Optionally, the first resonator in the resonator module is not connected to a load, and the second resonator is connected to a subsequent stage circuit of the receiving end.

[0010] Optionally, the second resonator is magnetically coupled to the energy flow track, and the first resonator has a terminal open-circuit characteristic at the position of the first resonator due to the terminal short-circuit, so that the power energy transmitted to the energy flow track load is reflected to form a standing wave with relatively stable amplitude and relative position, and a current antinode point is formed at the position of the second resonator.

[0011] Optionally, the resonator includes a receiving end coil and a compensation capacitor, and the compensation capacitor is arranged on the receiving end coil.

[0012] Optionally, the compensation capacitor is in the form of a single capacitor, a capacitor matrix or a distributed capacitor.

[0013] Optionally, there are multiple receiving end coils.

[0014] Optionally, the length of the ferrite base is equal to or greater than the length of the resonator module.

[0015] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0016] The present invention discloses a power pickup device based on an energy flow track wireless power transmission system, the device comprising a resonator module, a receiving end back-stage circuit and a ferrite base; the resonator module is electrically connected to the receiving end back-stage circuit through a lead, and the lead is fixed by directly passing through or bypassing the ferrite base; wherein the resonator module is composed of a plurality of resonators. The present invention can realize the interruption of the traveling wave transmitted by the energy flow track, and output power energy to the receiving end back-stage circuit through magnetic coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a technical roadmap of the existing dynamic wireless power transmission technology in this embodiment;

[0019] Figure 2 It is a schematic diagram of a power pickup device based on the energy flow track wireless power transmission system of the present invention;

[0020] Figure 3 Schematic diagram of the resonator structure in this embodiment;

[0021] Figure 4 In this embodiment Figure 3 Schematic diagram from top view.

[0022] Reference numerals:

[0023] 101. Power pickup device; 102. Resonator 1; 103. Resonator 2; 104. Receiving end post-stage circuit; 105. Ferrite base; 106. Energy flow track; 107. Track end load; 108. Power supply end; 109. Compensation capacitor; 110. Receiving end coil. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a power pickup device based on an energy flow track wireless power transmission system, which can cut off the traveling wave transmitted by the energy flow track and output power energy to the subsequent circuit of the receiving end through magnetic coupling.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, it can be seen that the technical roadmap of the existing dynamic wireless power transmission technology, therefore, the present invention provides the following Figure 2A power pickup device 101 based on a wireless power transmission system of an energy flow track 106 is shown, wherein the wireless power transmission system of the energy flow track 106 includes a power supply end 108, an energy flow track 106 and a track end load 107, including: a resonator module, a receiving end rear stage circuit 104 and a ferrite base 105; the resonator module is electrically connected to the receiving end rear stage circuit 104 through a lead, and the lead is fixed by directly passing through or bypassing the ferrite base 105; wherein the resonator module is composed of a plurality of resonators.

[0028] As a more specific implementation, the power pickup device 101 includes a resonator 1102, a resonator 2103, a receiving end back-stage circuit 104 and a ferrite base 105. The energy transmission structure of the wireless power transmission system based on the energy flow track 106 is composed of a power supply end 108, an energy flow track 106 and a track end load 107.

[0029] Further, the structures of resonator 1102 and resonator 2103 refer to Figure 3 The resonator structure is composed of a compensation capacitor 109 and a receiving end coil 110.

[0030] Furthermore, the resonator 1102 is not connected to a load, and the compensation capacitor 109 is directly connected to the receiving end coil 110, presenting a terminal short circuit characteristic. The resonator 2103 is connected to the receiving end post-stage circuit 104.

[0031] The receiving end back stage circuit 104 is an AC load or a DC load device including rectification, filtering, voltage stabilization and loading. The receiving end back stage circuit 104 is electrically connected to the resonator 2103 using a lead wire, which can directly pass through the ferrite base 105 or bypass the ferrite base 105.

[0032] Optionally, in the connection between the resonator 2103 and the receiving end subsequent circuit 104, the compensation capacitor 109 may be a capacitor matrix, a single capacitor or a distributed capacitor.

[0033] refer to Figure 2 , the distance between the center points of resonator 1102 and resonator 2103 is a quarter of the wavelength corresponding to the operating frequency;

[0034] Optionally, the distance between the center points of resonator 1102 and resonator 2103 may be greater than or less than a quarter of the wavelength corresponding to the operating frequency.

[0035] Furthermore, the power supply terminal 108 is a high-frequency AC power supply, and the energy flow track 106 is a transmission line structure composed of two conductors or multiple conductors. The two ends of the energy flow track 106 are electrically connected to the power supply terminal 108 and the track end load 107 respectively.

[0036] When the impedance of the track end load 107 is the same as the output impedance of the power supply end 108 and the characteristic impedance of the energy flow track 106, the energy flow track 106 operates in a matching state, and a traveling wave is transmitted in the energy flow track 106. When the impedance of the track end load 107 is not the same as the output impedance of the power supply end 108 and the characteristic impedance of the energy flow track 106, the energy flow track 106 operates in an incomplete matching state, and a traveling standing wave can be transmitted in the energy flow track 106. By transmitting traveling waves or traveling standing waves through the energy flow track 106, power energy is transmitted along the energy flow track 106, so that power energy can be transmitted to the receiving end rear stage circuit 104 at different positions of the energy flow track 106 when a power pickup device is loaded.

[0037] Furthermore, when the energy flow track 106 is loaded with the power pickup device 101 based on wireless power transmission of the energy flow track 106 , the resonator 1102 generates magnetic coupling with the energy flow track 106 , and the power flowing from the energy flow track 106 to the load 107 at the end of the track is cut off.

[0038] Optionally, after the energy flow track 106 is loaded with the power pickup device 101 based on wireless power transmission of the energy flow track 106 , the power flowing in the track to the load 107 at the end of the track is not completely cut off.

[0039] Furthermore, since the resonator 1102 is short-circuited at the terminal, the energy flow track 106 is in a high impedance state at the resonator 1102, and the power energy is reflected, presenting an open-circuit terminal characteristic. The resonator 2103 is magnetically coupled with the energy flow track 106 to provide transmission power energy to the receiving end subsequent circuit 104.

[0040] On the basis of the above technical solution, by not loading or loading the power pickup device 101, the energy flow track 106 is placed in a matching transmission traveling wave (or traveling standing wave) or the track is placed in an equivalent open circuit state to form a standing wave. The specific working principle of the present invention is as follows:

[0041] 1 When the power pickup device 101 is not loaded on the track, the energy flow track 106 transmits a traveling wave (optionally, the energy flow track 106 transmits a traveling standing wave);

[0042] When the power pickup device 101 is loaded on the track, the device of the present invention is implemented as a wireless power transmission principle of the receiving end rear circuit 104 in motion, which includes the following two points:

[0043] 2.1 By coupling with the magnetic flux generated by the energy flow track 106, the resonator 1102 has an open-circuit terminal characteristic at the position of the resonator 1102 due to the terminal short circuit, so that the power energy transmitted to the load of the energy flow track 106 is reflected, forming a standing wave with relatively stable amplitude and relative position, and forming a current antinode point at the position of the resonator 2103.

[0044] 2.2 By coupling with the magnetic flux generated by the energy flow track 106, the resonator 2103 transmits power energy to the receiving end subsequent circuit 104.

[0045] Therefore, the present invention has the following beneficial effects:

[0046] 1. The wireless power transmission system based on the energy flow track 106 of the present invention can use only one set of front-stage circuits of the power supply end 108 to provide power energy for the long-distance energy flow track 106, thereby eliminating the need to use a high-order compensation structure and a multi-phase switching control system, thereby simplifying the system topology.

[0047] 2. The present invention uses a resonator to make the energy flow track 106 work in an equivalent open circuit state, and uses a resonator electrically connected to the receiving end rear stage circuit 104 to magnetically couple with the energy flow track 106 to receive power energy. The energy flow track 106 generates a uniform magnetic field distribution or a periodic magnetic field distribution when it is not loaded or loaded with the power pickup device 101, thereby realizing wireless power transmission of moving loads above the energy flow track 106 and at different positions.

[0048] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0049] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A power pickup device based on an energy flow track wireless power transmission system, wherein the energy flow track wireless power transmission system comprises a power supply end, an energy flow track and a track end load, characterized in that: The power pickup device includes: a resonator module, a receiving end rear-stage circuit and a ferrite base; the resonator module is electrically connected to the receiving end rear-stage circuit through a lead, and the lead is fixed by directly passing through or bypassing the ferrite base; wherein the resonator module is composed of multiple resonators.

2. The power pickup device based on the energy flow track wireless power transmission system according to claim 1 is characterized in that: When the number of the resonators is two, the center distance between the two resonators is set to be a quarter wavelength corresponding to the set working frequency.

3. The power pickup device based on the energy flow track wireless power transmission system according to claim 2 is characterized in that: The first resonator in the resonator module is not connected to a load, and the second resonator is connected to the receiving end rear stage circuit.

4. The power pickup device based on the energy flow track wireless power transmission system according to claim 3 is characterized in that: The second resonator is magnetically coupled to the energy flow track. The first resonator has a terminal open-circuit characteristic at the position of the first resonator due to the terminal short-circuit, so that the power energy transmitted to the energy flow track load is reflected to form a standing wave with relatively stable amplitude and relative position, and a current antinode point is formed at the position of the second resonator.

5. The power pickup device based on the energy flow track wireless power transmission system according to claim 1, characterized in that: The resonator includes a receiving end coil and a compensation capacitor, and the compensation capacitor is arranged on the receiving end coil.

6. The power pickup device based on the energy flow track wireless power transmission system according to claim 5 is characterized in that: The compensation capacitor is in the form of a single capacitor, a capacitor matrix or a distributed capacitor.

7. The power pickup device based on the energy flow track wireless power transmission system according to claim 5, characterized in that: The number of the receiving end coils is multiple.

8. The power pickup device based on the energy flow track wireless power transmission system according to claim 1 is characterized in that: The length of the ferrite base is equal to or greater than the length of the resonator module.

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