Dynamic multi-load constant-current wireless power transmission system

Abstract

The invention discloses a dynamic multi-load constant-current wireless electric energy transmission system, and belongs to the technical field of wireless electric energy transmission. The system comprises a transmitting coil, a plurality of unloaded repeating coils, loaded repeating coils and receiving coils, the number of the loaded repeating coils corresponds to that of the unloaded repeating coils, the coils are connected through ferrite plates, and the receiving coils are arranged on the edges of the loaded repeating coils and can move. According to the invention, the ferrite plate is introduced to enhance the main mutual inductance and suppress the cross coupling, so that the transmission efficiency of the system is improved and the output current is stabilized under the multi-load condition. The system is simple in structure and high in compatibility, supports free placement of the receiving device in a charging area without affecting the overall performance of the system, and is suitable for a scene of simultaneous wireless power supply of multiple devices.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wireless power transmission, and relates to a novel structure based on a constant-current output structure design and introducing a ferrite plate. BACKGROUND

[0002] Wireless power transmission (WPT) technology is more and more widely applied in various fields and is concerned by scholars at home and abroad. It improves safety and flexibility of equipment and effectively solves problems such as aging of electric wires, electric leakage, electric leakage fire, poor waterproof and dustproof capability of electric equipment and restriction of equipment by complex electric wires. However, the current problems are one-to-one charging of wireless charging equipment, limited number of charging equipment, low charging efficiency, and differences in wireless charging standards or requirements of different equipment, which causes some equipment to be unable to be charged or unstable in the charging state, thereby limiting the application of the WPT technology.

[0003] Chinese patent CN110085393A proposes a Π-type ferrite and flat coil wireless power transmission system. The Π-type ferrite structure is used, and there is a space matched with the Π-type ferrite on the coil. The ferrite is embedded in the space, and the transmission efficiency of the system can be improved. However, the structure is not suitable for a multi-load WPT system. SUMMARY

[0004] The application aims to overcome the defects of the prior art and proposes a dynamic multi-load constant-current wireless power transmission system, which reduces the influence of removing a charging equipment on the entire system and improves the transmission efficiency of the system. Under the premise of fixing the shape and size of the coil, the main mutual inductance M or the main coupling coefficient k between adjacent coils is increased by placing a ferrite plate between the adjacent coils, and the influence on the cross-coupling coefficient can be ignored, thereby improving the transmission efficiency of the system.

[0005] The application is implemented through the following technical solutions.

[0006] The dynamic multi-load constant-current wireless power transmission system provided by the application comprises one transmitting coil, a plurality of non-load relay coils, a corresponding number of load-bearing relay coils and a receiving coil. The number n of the non-load relay coils is greater than or equal to 3 and is an odd number. The transmitting coil, the non-load relay coil and the load-bearing relay coil are connected through a ferrite, and the receiving coil is placed at a position at the edge of the load-bearing relay coil.

[0007] One connection mode between the coils is that the transmitting coil and the non-load relay coil are sequentially connected in series through the ferrite, the load-bearing relay coil is connected to the side of the odd-numbered non-load relay coil through the ferrite alternately, and the receiving coil is placed at a position at the edge of the load-bearing relay coil.

[0008] Another connection between the coils is that the transmitting coil and the no-load relay coil are connected in series through ferrite in turn, the load-bearing relay coil is connected to the two sides of the odd no-load relay coil through ferrite alternately, and the receiving coil is placed at the edge position of the load-bearing relay coil.

[0009] Another connection between the coils is that the transmitting coil is located in the middle, the no-load relay coil is connected in series through ferrite in turn with the two opposite sides of the transmitting coil, the load-bearing relay coil is connected to the side of the odd no-load relay coil through ferrite alternately, and the receiving coil is placed at the edge position of the load-bearing relay coil.

[0010] The receiving coil can be moved at the edge position of the load-bearing relay coil.

[0011] The application introduces a new structure based on the constant current output structure design. Through this structure, the input current of the receiving device is constant, the power consumption devices with the same rated current are universal, the problem of device incompatibility is solved, and the extensibility structure is realized. At the same time, PC40 manganese-zinc ferrite is introduced. This ferrite has the function of concentrating magnetic flux, can increase the main coupling coefficient, and has little effect on the cross coupling coefficient, thereby strengthening the magnetic field coupling, improving the system transmission efficiency, and improving the compatibility of the device.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] 1. The coil structure of the application meets the dynamic multi-load constant current power supply. The receiving coil, the no-load relay coil, the load-bearing relay coil, the receiving coil and the ferrite plate are connected in turn, so that the receiving coil can be moved on the load-bearing relay coil without affecting the operation of the whole power supply system, the receiving coils do not interfere with each other, and the multi-load constant current power supply efficiency is not greatly affected.

[0014] 2. The application has the advantages of simple structure, easy operation, constant current output, independent load, and high compatibility. DETAILED DESCRIPTION

[0015] Figure 1 is a schematic diagram of embodiment 1 of the application.

[0016] Figure 2 is a schematic diagram of embodiment 2 of the application.

[0017] Figure 3 is a schematic diagram of embodiment 3 of the application.

[0018] Figure 4 is the coupling coefficient between the coils.

[0019] Figure 5 is a three-load ADS simulation chart.

[0020] Figure 6 is a three-load ADS simulation test result chart.

[0021] Figure 7 is a two-load ADS simulation chart.

[0022] Figure 8 is a two-load ADS simulation test result chart.

[0023] Figure 9 is a single-load ADS simulation chart.

[0024] Figure 10 is a single-load ADS simulation test result chart.

[0025] Wherein: 1 is a transmitting coil, 2 is a no-load relay coil I, 3 is a no-load relay coil II, 4 is a no-load relay coil III, 5 is a no-load relay coil IV, 6 is a no-load relay coil V, 7 is a load-bearing relay coil I, 8 is a load-bearing relay coil II, 9 is a load-bearing relay coil III, 10 is a receiving coil I, 11 is a receiving coil II, 12 is a receiving coil III, 14 is a load-bearing coil IV, 15 is a load-bearing coil V, 16 is a load-bearing coil VI, 17 is a receiving coil IV, 18 is a receiving coil V, 19 is a receiving coil VI, and 13 is a ferrite. DETAILED DESCRIPTION

[0026] The technical solutions of the embodiments of the application will be described clearly and completely below with reference to the drawings of the application.

[0027] In the following embodiments, the transmitting coil, the no-load relay coil and the load-bearing relay coil have the same size: 250mm in length, 250mm in width and 6.2mm in height, and the receiving coil has the size: 120mm in length, 120mm in width and 6.2mm in height.

[0028] Embodiment 1

[0029] In combination with Figure 1 the drawings, the dynamic multi-load constant-current wireless power transmission system described in the embodiment includes a transmitting coil 1, five no-load relay coils I 2, II 3, III 4, IV 5 and V 6, three load-bearing relay coils I 7, II 8 and III 9, and three receiving coils I 10, II 11 and III 12.

[0030] The transmitting coil 1, the relay coil I 2, the relay coil II 3, the relay coil III 4, the relay coil IV 5, and the relay coil V 6 are connected in series through ferrite in turn; the load-bearing relay coil III 7 and the side of the relay coil I 2 are connected through ferrite, the load-bearing relay coil II 8 and the side of the relay coil III 4 are connected through ferrite, and the load-bearing relay coil III 9 and the side of the relay coil I 6 are connected through ferrite. The receiving coil I 10 is placed at the position of the four peripheral edges of the load-bearing relay coil I 7, the receiving coil II 11 is placed at the position of the four peripheral edges of the load-bearing relay coil II 8, and the receiving coil III 12 is placed at the position of the four peripheral edges of the load-bearing relay coil III 9.

[0031] Embodiment 2

[0032] In combination Figure 2 As shown in the figure, the dynamic multi-load constant-current wireless power transmission system described in this embodiment includes a transmitting coil 1, five non-load relay coils I 2, non-load relay coil II 3, non-load relay coil III 4, non-load relay coil IV 5, and non-load relay coil V 6; six load-bearing relay coils I 7, load-bearing relay coil II 8, load-bearing relay coil III 9, load-bearing relay coil IV 14, load-bearing relay coil V 15, and load-bearing relay coil VI 16, and six receiving coils I 10, receiving coil II 11, receiving coil III 12, receiving coil IV 17, receiving coil V 18, and receiving coil VI 19.

[0033] The transmitting coil 1, the relay coil I 2, the relay coil II 3, the relay coil III 4, the relay coil IV 5, and the relay coil V 6 are connected in series through ferrite in turn; the load-bearing relay coil I 7, the load-bearing relay coil IV 14 are respectively connected with the two side edges of the relay coil I 2 through ferrite, the load-bearing relay coil II 8, the load-bearing relay coil V 15 are respectively connected with the two side edges of the relay coil III 4 through ferrite, and the load-bearing relay coil III 9, the load-bearing relay coil VI 16 are respectively connected with the two side edges of the relay coil V 6 through ferrite. The receiving coil I 10 is placed at the position of the four peripheral edges of the load-bearing relay coil I 7, the receiving coil II 11 is placed at the position of the four peripheral edges of the load-bearing relay coil II 8, and the receiving coil III 12 is placed at the position of the four peripheral edges of the load-bearing relay coil III 9. The receiving coil IV 17 is placed at the position of the four peripheral edges of the load-bearing relay coil IV 14, the receiving coil V 18 is placed at the position of the four peripheral edges of the load-bearing relay coil V 15, and the receiving coil VI 19 is placed at the position of the four peripheral edges of the load-bearing relay coil VI 16.

[0034] Embodiment 3

[0035] In combination Figure 3As shown, the dynamic multi-load constant-current wireless power transmission system described in the embodiment includes a transmitting coil 1, five no-load relay coils I 2, no-load relay coil II 3, no-load relay coil III 4, no-load relay coil IV 5, and no-load relay coil V 6; three load-bearing relay coils I 7, load-bearing relay coil II 8, and load-bearing relay coil III 9, and three receiving coils I 10, receiving coil II 11, and receiving coil III 12.

[0036] The relay coil III 4, the relay coil II 3, the relay coil I 2, the transmitting coil 1, the relay coil IV 5, and the relay coil V 6 are connected in series through ferrite; the load-bearing relay coil I 7 is connected to the side of the relay coil III 4 through ferrite, the load-bearing relay coil II 8 is connected to the side of the relay coil I 2 through ferrite, and the load-bearing relay coil III 9 is connected to the side of the relay coil IV 5 through ferrite. The receiving coil I 10 is placed at the position of the four peripheral edges of the load-bearing relay coil I 7, the receiving coil II 11 is placed at the position of the four peripheral edges of the load-bearing relay coil II 8, and the receiving coil III 12 is placed at the position of the four peripheral edges of the load-bearing relay coil III 9.

[0037] From Figures 5-10 It can be seen that the voltage values of all loads are basically equal at the 100 kHz resonance point, and will not change with the change of the resistance value of the receiving coil.

[0038] The present application increases the length of the APR coil and the number of receiving coils to achieve multi-load power supply and increase compatibility without affecting the charging efficiency.

[0039] The protection scope of the present application should not be limited to the content disclosed in the embodiments, but should include various alternatives and modifications without departing from the present application, all of which are covered by the claims of the present patent application.

Claims

1. A dynamic multi-load constant current wireless power transfer system, characterized in that, It includes a transmitting coil, a plurality of non-load relay coils, a corresponding number of load relay coils and a receiving coil, the number of non-load relay coils is n≥3 and is an odd number; the transmitting coil and the non-load relay coils are connected in series through ferrite in turn, the load relay coils are connected to the side of the odd-numbered non-load relay coils through ferrite in turn, and the receiving coil is placed at the edge position of the load relay coils.

2. A dynamic multi-load constant current wireless power transfer system, characterized in that, It includes a transmitting coil, a plurality of non-load relay coils, a corresponding number of load relay coils and a receiving coil, the number of non-load relay coils is n≥3 and is an odd number; the transmitting coil and the non-load relay coils are connected in series through ferrite in turn, the load relay coils are connected to the side of the odd-numbered non-load relay coils through ferrite in turn, and the receiving coil is placed at the edge position of the load relay coils.

3. A dynamic multi-load constant current wireless power transfer system, characterized in that, It includes a transmitting coil, a plurality of non-load relay coils, a corresponding number of load relay coils and a receiving coil, the number of non-load relay coils is n≥3 and is an odd number; the transmitting coil and the non-load relay coils are connected in series through ferrite in turn, the load relay coils are connected to the side of the odd-numbered non-load relay coils through ferrite in turn, and the receiving coil is placed at the edge position of the load relay coils.

4. The dynamic multi-load constant-current wireless power transfer system of claim 1, 2 or 3, wherein, The receiving coil can be moved at the edge position of the load relay coils.

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