A multi-transmitter-coil one-to-many charging system for wireless charging power supply

Abstract

The present invention provides a multi-transmitter-coil one-to-many charging system for wireless charging power supply, belonging to the technical field of wireless power transmission, which includes a wireless transmitting end and a wireless receiving end coupled to the wireless transmitting end. This one-to-many charging system simultaneously performs wireless charging power supply to all devices placed within the space of the transmitting end, and has good charging efficiency. The shape of the transmitting end is a three-dimensional form such as a cuboid, a cube, a cylinder, etc., and the shape of the receiving end is an electrical device with a three-dimensional shape made of metal or plastic. Compared with the traditional wireless charging system, this system gets rid of the limitation of planar coil charging for planar coil, and can also charge normally when the receiving electrical device has a metal shell material, getting rid of the limitation of traditional charging for metal, and the adaptability of the receiving device is broader.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission, and particularly relates to a multi-transmitter-coil one-to-many charging system for wireless charging and power supply. Background Art

[0002] With the continuous development of industries such as electronic information technology, automation control technology, Internet of Things, and smart home, various electronic products such as household appliances, game consoles, and mobile communication devices have been widely popularized. And all kinds of electronic devices need to be powered, including many battery-powered electronic products. If each electronic product is powered separately, it is not only troublesome to operate, time-consuming and laborious, occupies space, but also there are safety hazards with different brand chargers. Therefore, the present invention can not only accommodate all different models of electronic products in this three-dimensional space, but also wirelessly charge each device while accommodating items in this three-dimensional space. This not only saves manpower, saves space, but also greatly improves the charging efficiency of electronic products and reduces the charging safety hazards. Summary of the Invention

[0003] Aiming at the above deficiencies in the prior art, the present invention provides a multi-transmitter-coil one-to-many charging system for wireless charging and power supply, which solves the problems of cumbersome charging of existing electronic products, a large waste of charger resources due to different charging methods among different products, safety hazards, and inconvenience in sorting and storage.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a multi-transmitter-coil one-to-many charging system for wireless charging and power supply, including a wireless transmitting end and a wireless receiving end coupled to the wireless transmitting end;

[0005] The wireless transmitting end includes a transmitting end controller, a transmitting forward excitation antenna, a transmitting reverse excitation antenna, a first transmitting relay antenna, and a second transmitting relay antenna; the transmitting end controller, the transmitting forward excitation antenna, and the transmitting reverse excitation antenna are connected in sequence; the first transmitting relay antenna is located directly above the transmitting forward excitation antenna and the transmitting reverse excitation antenna; the second transmitting relay antenna is within the internal space range of the first transmitting relay antenna, dividing the first transmitting relay antenna into three-dimensional space regions of different sizes.

[0006] The wireless receiving end is a three-dimensional receiving electrical device main body made of a metal shell material that cannot be penetrated by a magnetic field, with a magnetic shielding material that is arranged on the outer surface of the three-dimensional receiving electrical device main body made of a metal shell material and has a fixed thickness to allow the magnetic field to pass through, a receiving antenna arranged on the surface of the magnetic shielding material, and a receiving controller arranged at one end of the receiving electrical device main body made of a metal shell material; the receiving electrical device main body, the magnetic shielding material, and the receiving antenna are adhesively fixed together in sequence, and the receiving controller is fixed on the outer surface of the receiving electrical device main body;

[0007] The transmitting end controller is wirelessly communicatively connected to the receiving controller; the transmitting forward excitation antenna, the reverse excitation antenna, the first transmitting relay antenna, the second transmitting relay antenna, and the receiving antenna are coupled through a spatial magnetic field.

[0008] Further, the transmitting end controller is used to drive the driving signal of the wireless transmitting end, wherein the driving method is to perform modulation simultaneously with pulse width modulation (PWM) and pulse frequency modulation (PFM).

[0009] Still further, the modulation circuit of the driving signal includes control chip U15, control chip U14, control chip U8, control chip U13, and control chip U7;

[0010] The VDD pin of the control chip U15 is respectively connected to one end of the resistor R83, one end of the resistor R84, the network CLK_3V0, the grounding capacitor C64, the grounding capacitor C63, and the positive electrode of the diode D15. The SCL pin of the control chip U15 is respectively connected to the other end of the resistor R83 and the network I2C_SCL. The SDA pin of the control chip U15 is respectively connected to the other end of the resistor R84 and the network I2C_SDA. The XA pin of the control chip U15 is respectively connected to the first pin of the crystal oscillator Y1 and the grounding capacitor C72. The XB pin of the control chip U15 is respectively connected to the third pin of the crystal oscillator Y1 and the grounding capacitor C70. The CLK2 pin of the control chip U15 is connected to one end of the resistor R77. The VDD0 pin of the control chip U15 is connected to the negative electrode of the diode D15. The other end of the resistor R77 is respectively connected to one end of the resistor R73 and one end of the resistor R72. The other end of the resistor R73 is respectively connected to the A pin and the B pin of the control chip U14. The + pin of the control chip U14 is respectively connected to the network LOG_3V3, the grounding capacitor C52, and the grounding capacitor C51. The - pin of the control chip U14 is grounded. The Y pin of the control chip U14 is connected to one end of the resistor R67. The other end of the resistor R67 is respectively connected to the grounding capacitor C42 and one end of the resistor R62. The other end of the resistor R62 is respectively connected to the grounding capacitor C40 and one end of the resistor R52. The other end of the resistor R52 is connected to the + pin of the control chip U8. The - pin of the control chip U8 is connected to one end of the resistor R47. The other end of the resistor R47 is connected to the network REF_ADC. The V- pin of the control chip U8 is grounded. The V+ pin of the control chip U8 is respectively connected to the grounding capacitor C32 and the network LOG_3V3. The fourth pin of the control chip U8 is connected to one end of the resistor R33. The other end of the resistor R33 outputs the first modulation signal. The other end of the resistor R72 is connected to the A pin of the control chip U13. The + pin of the control chip U13 is respectively connected to the network LOG_3V3, the grounding capacitor C50, and the grounding capacitor C49. The - pin of the control chip U13 is grounded. The Y pin of the control chip U13 is connected to one end of the resistor R66. The other end of the resistor R66 is respectively connected to the grounding capacitor C41 and one end of the resistor R61. The other end of the resistor R61 is respectively connected to the grounding capacitor C39 and one end of the resistor R51. The other end of the resistor R51 is connected to the + pin of the control chip U7. The - pin of the control chip U7 is connected to one end of the resistor R46. The other end of the resistor R46 is connected to the network REF_ADC. The V- pin of the control chip U7 is grounded. The V+ pin of the control chip U7 is respectively connected to the grounding capacitor C31 and the network LOG_3V3. The fourth pin of the control chip U7 is connected to one end of the resistor R35.The other end of the resistor R35 outputs a second modulation signal.

[0011] Furthermore, the transmitting forward excitation antenna and the transmitting reverse excitation antenna convert electrical energy into a loose electromagnetic field and distribute it in the area directly above the antenna.

[0012] Furthermore, the transmitting coil of the wireless transmitting end utilizes the mutual coupling among the transmitting forward excitation antenna, the transmitting reverse excitation antenna, the first transmitting relay antenna, and the second transmitting relay antenna to make the magnetic field distribution in the three-dimensional space balanced.

[0013] Furthermore, the winding method of the antenna of the wireless receiving end is as follows: the antenna is wound on the outer surface of the three-dimensional receiving electrical device body made of a metal shell material, and the magnetic shielding material is used to protect the internal metal from magnetic field radiation. At the same time, a three-dimensional space allowing the magnetic field to pass through is formed by having a magnetic shielding material with a fixed thickness between the metal and the antenna, so that the antenna and the magnetic field are in an orthogonal direction to cut the magnetic induction lines to obtain magnetic field energy.

[0014] Furthermore, there are multiple wireless receiving ends, and all wireless receiving ends can work normally simultaneously, and the load-carrying capacity is balanced within the transmitting space magnetic field range.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) The present invention uses a three-dimensional-shaped transmitting end to convert direct current electrical energy into an electromagnetic field. When a receiving end with a receiving antenna is placed inside the three-dimensional transmitting end antenna system, after the receiving antenna couples to the electromagnetic field of the transmitting antenna, the electromagnetic field is converted into direct current electrical energy by the receiving controller, and then the electrical devices inside the receiving end are powered, enabling the electrical devices to be in a stable working state or a charging state. This invention no longer requires the cumbersome matter of charging different devices every day, and at the same time eliminates chargers of different specifications and models, reducing the user's usage cost and greatly reducing resource waste.

[0017] (2) The transmitting end of the present invention uses a multi-coil transmitting system, namely a forward excitation transmitting antenna, a reverse excitation transmitting antenna, a first transmitting relay antenna, and a second transmitting relay antenna. Among them, the forward excitation transmitting antenna and the reverse excitation transmitting antenna can widely distribute the magnetic field in the three-dimensional space above the transmitting coil. Secondly, the first transmitting relay antenna recouples and distributes the magnetic field to achieve a relatively balanced distribution state. Secondly, the second transmitting relay antenna further recouples and evenly distributes the magnetic field, and finally makes the magnetic field at the transmitting end reach a completely balanced distribution state in the three-dimensional space. When the receiving antenna is placed at any position in this area, it can capture the same amount of magnetic field, thus ensuring that the receiving controller has the same load-carrying capacity at any position in the three-dimensional space. Compared with the traditional face-to-face charging system of the transmitting system, the multi-coil coupling system can achieve a balanced distribution of the magnetic field in the three-dimensional space, thus realizing three-dimensional space charging, and the charging effect has good consistency.

[0018] (3) The winding method of the receiving end of the present invention is that the main body of the electrical device for receiving electricity, the magnetic shielding material, and the receiving antenna coil are bonded together in sequence. Among them, the magnetic shielding material can protect the internal metal from being heated by magnetic field radiation, and at the same time can allow the magnetic field to pass through between the metal and the antenna, so as to obtain magnetic field energy. Compared with the problems that the traditional metal electrical device for receiving electricity cannot be charged and the metal shell generates heat, the present invention can completely solve this problem, and at the same time will not cause damage to the main body of the electrical device for receiving electricity.

[0019] (4) The driving method of the transmitting end of the present invention adopts two driving methods of pulse width modulation PWM and pulse frequency modulation PFM. Pulse frequency modulation PFM can quickly adjust the driving frequency to achieve the purpose of timely responding to the RX power demand, output the required power, and achieve the purpose of "coarse adjustment". Pulse width modulation PWM has little influence on the antenna power. This adjustment method can slowly and accurately adjust the output power to the required target value, protecting the electrical devices at the back end from damage such as overvoltage and overcurrent, and achieving the purpose of "fine adjustment".

[0020] (5) The design idea of the present invention is that multiple coils are mutually coupled to achieve a balanced distribution of the magnetic field. This design idea can design the size of the transmitting end to any size and any shape, and the number of relay antennas can be increased or decreased according to the actual use effect, increasing the design flexibility. Brief Description of the Drawings

[0021] Figure 1 The figure shows a schematic diagram of the transmitting end antenna system provided by an embodiment of the present invention.

[0022] Figure 2 The figure shows a schematic diagram of the forward excitation transmitting antenna and the reverse excitation transmitting antenna provided by an embodiment of the present invention.

[0023] Figure 3The figure shows a schematic diagram of the receiving - end antenna system provided by an embodiment of the present invention.

[0024] Figure 4 The figure shows a schematic diagram of the system operation provided by an embodiment of the present invention.

[0025] Figure 5 The figure shows a system block diagram of a multi - transmitter - coil one - to - many charging system for wireless charging power supply provided by an embodiment of the present invention.

[0026] Figure 6 The figure shows a schematic diagram of a Pulse - Width Modulation (PWM) and Pulse - Frequency Modulation (PFM) circuit provided by an embodiment of the present invention.

[0027] Among them, 11 is the transmitter controller; 12 is the forward - excitation transmitting antenna; 13 is the reverse - excitation transmitting antenna; 14 is the first transmitting relay antenna; 15 is the second transmitting relay antenna; 16 is the overall receiving - end schematic; 21 is the main body of the receiving electrical device; 22 is the magnetic shielding material; 23 is the receiving antenna; 24 is the receiving controller. Detailed implementation manners

[0028] The following describes the detailed implementation manners of the present invention to facilitate those skilled in the art of this technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed implementation manners. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions made using the concept of the present invention are within the scope of protection.

[0029] Embodiment

[0030] Before explaining the present invention, the following terms are first explained:

[0031] CLK_3V0: The power supply port of the 3.0V driving signal;

[0032] Network I2C_SCL: The I2C communication clock signal port;

[0033] Network I2C_SDA: The I2C communication data signal line port;

[0034] Network LOG_3V3: The power supply port of the 3.3V logic signal;

[0035] Network REF_ADC: The reference voltage sampling port.

[0036] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 And Figure 5As shown in the figure, the present invention provides a multi-transmitter-coil one-to-many charging system for wireless charging power supply, including a wireless transmitter and a wireless receiver coupled to the wireless transmitter;

[0037] The wireless transmitter includes a transmitter controller 11, a forward excitation antenna 12, a reverse excitation antenna 13, a first relay antenna 14, and a second relay antenna 15; the transmitter controller 11, the forward excitation antenna 12, and the reverse excitation antenna 13 are connected in sequence; the first relay antenna 14 is located directly above the forward excitation antenna 12 and the reverse excitation antenna 13; the second relay antenna 15 is within the internal space range of the first relay antenna 14, dividing the first relay antenna 14 into three-dimensional space regions of different sizes;

[0038] The wireless receiver is usually a three-dimensional receiving electrical device main body 21 made of a metal shell material that cannot be penetrated by a magnetic field, with a magnetic shielding material 22 having a fixed thickness and capable of allowing a magnetic field to pass on the outer surface of the three-dimensional receiving electrical device main body 21 made of a metal shell material, a receiving antenna 23 provided on the surface of the magnetic shielding material 22, and a receiving controller 24 provided at one end of the receiving electrical device main body 21 made of a metal shell material; the receiving electrical device main body 21, the magnetic shielding material 22, and the receiving antenna 23 are adhesively fixed together in sequence, and the receiving controller 24 is fixed to the outer surface of the receiving electrical device main body 21;

[0039] The transmitter controller 11 is wirelessly communicatively connected to the receiving controller 24; the forward excitation antenna 12, the reverse excitation antenna 13, the first relay antenna 14, the second relay antenna 15, and the receiving antenna 23 are coupled through a spatial magnetic field.

[0040] In this embodiment, the transmitting coil uses the forward excitation antenna 12, the reverse excitation antenna 13, the first relay antenna 14, and the second relay antenna 15. The multiple antennas are coupled to each other, making the three-dimensional space magnetic field distribution completely balanced, and at the same time improving the energy conversion efficiency of the antenna system.

[0041] In this embodiment, the wireless transmitting antenna is composed of multiple coils coupled to each other, which enables the size of the transmitting antenna to be of any size and any shape, and can ensure the normal operation of the system.

[0042] In this embodiment, the second relay antenna 15 is within the internal space range of the first relay antenna 14, dividing the first relay antenna 14 into space regions of different sizes, making the three-dimensional space magnetic field distribution completely balanced, thereby realizing three-dimensional space charging, and achieving a good charging effect at any position within the relay magnetic field space, and achieving a high charging efficiency.

[0043] In this embodiment, the transmitter controller 11 is used to drive the drive signal of the wireless transmitter, wherein the driving method is to perform modulation simultaneously with pulse width modulation (PWM) and pulse frequency modulation (PFM).

[0044] In this embodiment, as Figure 6 shown, the drive signal is in two modes of pulse width modulation (PWM) and pulse frequency modulation (PFM). This modulation circuit includes a drive waveform conversion circuit, a drive waveform duty cycle modulation circuit, and a peripheral circuit specifically:

[0045] The modulation circuit of the drive signal includes control chips U15, U14, U8, U13, and U7;

[0046] The VDD pin of the control chip U15 is respectively connected to one end of the resistor R83, one end of the resistor R84, the network CLK_3V0, the grounding capacitor C64, the grounding capacitor C63 and the positive electrode of the diode D15. The SCL pin of the control chip U15 is respectively connected to the other end of the resistor R83 and the network I2C_SCL. The SDA pin of the control chip U15 is respectively connected to the other end of the resistor R84 and the network I2C_SDA. The XA pin of the control chip U15 is respectively connected to the first pin of the crystal oscillator Y1 and the grounding capacitor C72. The XB pin of the control chip U15 is respectively connected to the third pin of the crystal oscillator Y1 and the grounding capacitor C70. The CLK2 pin of the control chip U15 is connected to one end of the resistor R77. The VDD0 pin of the control chip U15 is connected to the negative electrode of the diode D15. The other end of the resistor R77 is respectively connected to one end of the resistor R73 and one end of the resistor R72. The other end of the resistor R73 is respectively connected to the A pin and the B pin of the control chip U14. The + pin of the control chip U14 is respectively connected to the network LOG_3V3, the grounding capacitor C52 and the grounding capacitor C51. The - pin of the control chip U14 is grounded. The Y pin of the control chip U14 is connected to one end of the resistor R67. The other end of the resistor R67 is respectively connected to the grounding capacitor C42 and one end of the resistor R62. The other end of the resistor R62 is respectively connected to the grounding capacitor C40 and one end of the resistor R52. The other end of the resistor R52 is connected to the + pin of the control chip U8. The - pin of the control chip U8 is connected to one end of the resistor R47. The other end of the resistor R47 is connected to the network REF_ADC. The V- pin of the control chip U8 is grounded. The V+ pin of the control chip U8 is respectively connected to the grounding capacitor C32 and the network LOG_3V3. The fourth pin of the control chip U8 is connected to one end of the resistor R33. The other end of the resistor R33 outputs the first modulation signal. The other end of the resistor R72 is connected to the A pin of the control chip U13. The + pin of the control chip U13 is respectively connected to the network LOG_3V3, the grounding capacitor C50 and the grounding capacitor C49. The - pin of the control chip U13 is grounded. The Y pin of the control chip U13 is connected to one end of the resistor R66. The other end of the resistor R66 is respectively connected to the grounding capacitor C41 and one end of the resistor R61. The other end of the resistor R61 is respectively connected to the grounding capacitor C39 and one end of the resistor R51. The other end of the resistor R51 is connected to the + pin of the control chip U7. The - pin of the control chip U7 is connected to one end of the resistor R46. The other end of the resistor R46 is connected to the network REF_ADC. The V- pin of the control chip U7 is grounded. The V+ pin of the control chip U7 is respectively connected to the grounding capacitor C31 and the network LOG_3V3. The fourth pin of the control chip U7 is connected to one end of the resistor R35.The other end of the resistor R35 outputs a second modulation signal.

[0047] In this embodiment, the transmitting forward excitation antenna 12 and the transmitting reverse excitation antenna 13 convert electrical energy into a loose electromagnetic field and distribute it in the area directly above the antenna, for the first convergence and equalization of the electromagnetic field above it.

[0048] In this embodiment, the transmitting coil of the wireless transmitting end utilizes the mutual coupling between the transmitting forward excitation antenna 12, the transmitting reverse excitation antenna 13, the first transmitting relay antenna 14, and the second transmitting relay antenna 15 to make the three-dimensional space magnetic field distribution balanced.

[0049] In this embodiment, the winding method of the antenna at the wireless receiving end is: winding the antenna on the outer surface of the three-dimensional receiving electrical device main body 21 made of metal shell material. The magnetic shielding material 22 is used to protect the internal metal from magnetic field radiation, and at the same time, a three-dimensional space allowing the magnetic field to pass through is formed with a fixed thickness of magnetic shielding material 22 between the metal and the antenna, so that the antenna and the magnetic field are in an orthogonal direction to cut the magnetic induction lines to obtain magnetic field energy.

[0050] In this embodiment, the winding method of the receiving end antenna is to wind the antenna on the outer surface of the receiving electrical device main body 21, that is, the receiving electrical device main body 21, the magnetic shielding material 22, and the receiving antenna 23 are sequentially and tightly bonded and fixed together, and the receiving controller 24 is fixed on the outer surface of the receiving electrical device main body 21. Among them, the magnetic shielding material 22 can protect the internal metal from the heating problem caused by magnetic field radiation, and at the same time, it can also allow the magnetic field to pass through between the metal and the antenna, so as to obtain magnetic field energy. Compared with the traditional metal receiving electrical device main body that cannot be charged and the problem of the metal shell heating, this invention can completely solve this problem and will not cause damage to the receiving electrical device main body at the same time.

[0051] In this embodiment, there are multiple wireless receiving ends. Among them, all wireless receiving ends can work normally at the same time, and the load-carrying capacity is balanced within the transmitting space magnetic field range.

[0052] In this embodiment, the specific structures of the LC resonance matching circuit of the wireless transmitting antenna and the LC resonance matching circuit of the wireless receiving antenna belong to the well-known common knowledge in the art and will not be elaborated here.

[0053] In this embodiment, the drive circuit of the wireless transmitting antenna and the rectifier filter circuit of the wireless receiving antenna are well-known common knowledge in the art and will not be elaborated here.

[0054] In this embodiment, such as Figure 5As shown in the figure, the working principle and specific process of the wireless charging power supply system are as follows: During normal operation, the external power supply supplies electrical energy to the transmitter controller 11 through the power cord. After the transmitter system is normally started, the transmitter controller 11 converts the electrical energy into an electromagnetic field through the forward excitation antenna 12 and the reverse excitation antenna 13. When the first transmitting relay antenna 14 couples to the electromagnetic field of the transmitter, the magnetic field is redistributed and arranged again. At this time, the distribution of the electromagnetic field becomes relatively balanced. When the second transmitting relay antenna 15 couples to the electromagnetic field distributed by the first transmitting relay antenna 14, the magnetic field distribution is arranged for the third time. At this time, the magnetic field in the space of the second transmitting relay antenna 15 is completely evenly distributed. When the receiving antenna 23 enters the magnetic field distribution area of the second transmitting relay antenna 15, it couples to the magnetic field of the transmitter. Through the internal circuit of the receiving controller 24, the coupled electromagnetic field is converted into a stable DC power supply to supply the backend load. At the same time, the receiving controller 24 coordinates the power output with the transmitter controller 11 according to the requirements of the backend load to maintain the stable operation of the system. And because the magnetic field of the transmitter is completely evenly distributed after two relays, the receiving device can stably output within the magnetic field distribution range of the second transmitting relay antenna 15, and there will be no abnormal phenomena such as too strong or too weak load-carrying capacity or overvoltage and overcurrent caused by uneven magnetic field distribution, thus ensuring the stable and normal operation of the backend load. Figure 5 In the receiving electrical device main body 21, it refers to the part that actually consumes electrical energy in the entire receiving device except for the receiving antenna system. The receiving end antenna directly supplies electrical energy to the receiving electrical device main body 21.

[0055] In this embodiment, as Figure 4 The closed or unclosed circles in the figure represent the schematic of the magnetic field emitted by the antenna, also called magnetic field lines. The antenna on the shell is larger and has a larger coverage area, so the drawn magnetic field ring is larger; the bottom antenna is smaller, and the drawn ring is also smaller, indicating a weak magnetic field and a smaller coverage area.

[0056] Through the working process described above, the present invention can not only realize the storage of electronic products, but also solve the charging problem of electronic products, and can also eliminate chargers of different models and specifications, playing a role in environmental protection and resource conservation.

[0057] Those of ordinary skill in the art will realize that the embodiments described here are to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations that do not deviate from the essence of the present invention based on these technical revelations disclosed in the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. A one-to-many charging system with multiple transmitting coils for wireless charging power supply, characterized in that, It includes a wireless transmitting end and a wireless receiving end coupled to the wireless transmitting end; The wireless transmitting end includes a transmitting end controller (11), a transmitting forward excitation antenna (12), a transmitting reverse excitation antenna (13), a first transmitting relay antenna (14), and a second transmitting relay antenna (15); the transmitting end controller (11), the transmitting forward excitation antenna (12), and the transmitting reverse excitation antenna (13) are connected in sequence; the first transmitting relay antenna (14) is located directly above the transmitting forward excitation antenna (12) and the transmitting reverse excitation antenna (13); The second transmitting relay antenna (15) is located within the internal space range of the first transmitting relay antenna (14), dividing the first transmitting relay antenna (14) into three-dimensional space regions of different sizes; The wireless receiving end is a three-dimensional receiving electrical device main body (21) made of a metal shell material that cannot be penetrated by a magnetic field, with a magnetic shielding material (22) having a fixed thickness and capable of allowing a magnetic field to pass on the outer surface of the three-dimensional receiving electrical device main body (21) made of a metal shell material, a receiving antenna (23) provided on the surface of the magnetic shielding material (22), and a receiving controller (24) provided at one end of the receiving electrical device main body (21) made of a metal shell material; the receiving electrical device main body (21), the magnetic shielding material (22), and the receiving antenna (23) are adhesively fixed together in sequence, and the receiving controller (24) is fixed to the outer surface of the receiving electrical device main body (21); The transmitting end controller (11) is wirelessly communicatively connected to the receiving controller (24); the transmitting forward excitation antenna (12), the transmitting reverse excitation antenna (13), the first transmitting relay antenna (14), the second transmitting relay antenna (15), and the receiving antenna (23) are coupled through a spatial magnetic field.

2. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 1, wherein The transmitting end controller (11) is used to drive the driving signal of the wireless transmitting end, wherein the driving method is to modulate both pulse width modulation PWM and pulse frequency modulation PFM simultaneously.

3. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 2, wherein The modulation circuit of the driving signal includes a control chip U15, a control chip U14, a control chip U8, a control chip U13, and a control chip U7; The VDD pin of the control chip U15 is respectively connected to one end of the resistor R83, one end of the resistor R84, the network CLK_3V0, the grounding capacitor C64, the grounding capacitor C63 and the positive electrode of the diode D15. The SCL pin of the control chip U15 is respectively connected to the other end of the resistor R83 and the network I2C_SCL. The SDA pin of the control chip U15 is respectively connected to the other end of the resistor R84 and the network I2C_SDA. The XA pin of the control chip U15 is respectively connected to the first pin of the crystal oscillator Y1 and the grounding capacitor C72. The XB pin of the control chip U15 is respectively connected to the third pin of the crystal oscillator Y1 and the grounding capacitor C70. The CLK2 pin of the control chip U15 is connected to one end of the resistor R77. The VDD0 pin of the control chip U15 is connected to the negative electrode of the diode D15. The other end of the resistor R77 is respectively connected to one end of the resistor R73 and one end of the resistor R72. The other end of the resistor R73 is respectively connected to the A pin and the B pin of the control chip U14. The + pin of the control chip U14 is respectively connected to the network LOG_3V3, the grounding capacitor C52 and the grounding capacitor C51. The - pin of the control chip U14 is grounded. The Y pin of the control chip U14 is connected to one end of the resistor R67. The other end of the resistor R67 is respectively connected to the grounding capacitor C42 and one end of the resistor R62. The other end of the resistor R62 is respectively connected to the grounding capacitor C40 and one end of the resistor R52. The other end of the resistor R52 is connected to the + pin of the control chip U8. The - pin of the control chip U8 is connected to one end of the resistor R47. The other end of the resistor R47 is connected to the network REF_ADC. The V- pin of the control chip U8 is grounded. The V+ pin of the control chip U8 is respectively connected to the grounding capacitor C32 and the network LOG_3V3. The fourth pin of the control chip U8 is connected to one end of the resistor R33. The other end of the resistor R33 outputs the first modulation signal. The other end of the resistor R72 is connected to the A pin of the control chip U13. The + pin of the control chip U13 is respectively connected to the network LOG_3V3, the grounding capacitor C50 and the grounding capacitor C49. The - pin of the control chip U13 is grounded. The Y pin of the control chip U13 is connected to one end of the resistor R66. The other end of the resistor R66 is respectively connected to the grounding capacitor C41 and one end of the resistor R61. The other end of the resistor R61 is respectively connected to the grounding capacitor C39 and one end of the resistor R51. The other end of the resistor R51 is connected to the + pin of the control chip U7. The - pin of the control chip U7 is connected to one end of the resistor R46. The other end of the resistor R46 is connected to the network REF_ADC. The V- pin of the control chip U7 is grounded. The V+ pin of the control chip U7 is respectively connected to the grounding capacitor C31 and the network LOG_3V3. The fourth pin of the control chip U7 is connected to one end of the resistor R35.The other end of resistor R35 outputs a second modulation signal.

4. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 1, wherein The transmitting forward excitation antenna (12) and the transmitting reverse excitation antenna (13) convert electrical energy into a loose electromagnetic field distributed in the area directly above the antenna.

5. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 1, wherein The transmitting coil of the wireless transmitting end uses the mutual coupling between the transmitting forward excitation antenna (12), the transmitting reverse excitation antenna (13), the first transmitting relay antenna (14), and the second transmitting relay antenna (15) to make the three-dimensional space magnetic field distribution balanced.

6. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 1, characterized in that, The winding method of the antenna of the wireless receiving end is: winding the antenna on the outer surface of the three-dimensional receiving electrical device main body (21) made of a metal shell material, and the magnetic shielding material (22) is used to protect the internal metal from magnetic field radiation, and at the same time, a three-dimensional space allowing the magnetic field to pass is formed by the magnetic shielding material (22) with a fixed thickness between the metal and the antenna, so that the antenna and the magnetic field are in an orthogonal direction to cut the magnetic induction line to obtain magnetic field energy.

7. The multi-transmitter-coil one-to-many charging system for wireless charging power supply according to claim 1, wherein There are multiple wireless receivers, and all of the wireless receivers can work properly simultaneously, and the load-carrying capacities are balanced within the range of the transmitted space magnetic field.

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