Magnetic integrated self-tuning wireless energy transmission device

Abstract

The utility model provides a magnetic integrated self-tuning wireless energy transmission device, and relates to the technical field of wireless power transmission. The device comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit is used for converting input direct current into alternating current and transmitting the converted alternating current to the secondary side circuit in the form of energy; the primary side circuit comprises a primary side H-bridge circuit, a primary side resonant capacitor, a transmitting coil, a primary side current transformer, a primary side zero-crossing comparator and a primary side NOT gate; the secondary side circuit is used for sensing the energy from the primary side circuit, converting the generated induction current into direct current and transmitting the direct current to a load; the secondary side circuit comprises a magnetic integrated receiving coil, a secondary side resonant capacitor, a secondary side H-bridge circuit, a secondary side current transformer, a secondary side zero-crossing comparator, a secondary side NOT gate and a direct current capacitor. According to the utility model, the magnetic integration and self-tuning technologies are combined, so that the cost is reduced, and the efficiency and stability of energy transmission are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless power transmission, and particularly relates to a magnetically integrated self-tuning wireless energy transmission device. Background Art

[0002] With the development of new energy technologies and the acceleration of the electrification process, wireless charging technology, as a convenient and efficient power transmission method, has been widely studied and applied. Wireless charging can be widely used in multiple fields such as electric vehicles, consumer electronics, and industrial equipment, improving the convenience and safety of equipment use.

[0003] Currently, existing wireless power transmission systems usually use inductive or magnetic resonance methods for energy transmission. To improve the output voltage stability and transmission efficiency of the system, most existing technologies use the method of adding a rectification and DC-DC conversion module at the receiving end, and adjusting the voltage through feedback to achieve constant voltage or constant current output. However, this method not only increases the hardware complexity of the system, raises the cost, but also may affect the overall efficiency of the system.

[0004] In response to the above problems, the application of magnetic integration technology and self-tuning technology in wireless power transmission systems has gradually attracted attention. Among them, magnetic integration technology optimizes the magnetic circuit design, reducing the system volume and weight while improving the energy transmission efficiency. However, magnetic integration technology has the problem of insufficient dynamic adaptability. For example, under dynamic operating conditions, the non-linear characteristics of the integrated magnetic circuit may lead to a decrease in efficiency or detuning. The self-tuning technology can automatically adjust system parameters according to load and environmental changes, thereby maintaining the best energy transmission state and improving the stability and adaptability of the system. However, the self-tuning technology often relies on external detection circuits and digital controllers to calculate the resonance frequency in real time, with problems such as detection delay and high algorithm complexity, especially difficult to quickly track when the mutual inductance changes suddenly.

[0005] Therefore, how to effectively combine magnetic integration and self-tuning technologies to optimize the receiving end structure of the wireless power transmission system, thereby achieving the improvement of system efficiency and stability while reducing costs, has become an important research direction in the current wireless charging technology field. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a magnetically integrated self-tuning wireless energy transmission device aiming at the deficiencies of the above-mentioned existing technologies, so as to improve the energy transmission efficiency during the wireless power transmission process.

[0007] To solve the above technical problem, a magnetically integrated self-tuning wireless energy transmission device of the utility model includes: a primary self-resonant wireless energy transmitting circuit and a secondary magnetically integrated self-resonant wireless energy receiving circuit;

[0008] The primary-side self-resonant wireless energy transmitting circuit transmits energy to the secondary-side magnetically integrated self-resonant wireless energy receiving circuit through magnetic coupling.

[0009] Further, the primary-side self-resonant wireless energy transmitting circuit includes: a primary-side H-bridge circuit, a primary-side resonant capacitor C1, a transmitting coil L1, a primary-side current transformer, a primary-side zero-crossing comparator, and a primary-side NOT gate;

[0010] The DC anode terminal and the DC cathode terminal of the primary-side H-bridge of the primary-side H-bridge circuit are respectively connected to both ends of a DC power supply; the AC terminal 1 of the primary-side H-bridge of the primary-side H-bridge circuit is connected to one end of the transmitting coil L1, the other end of the transmitting coil L1 is connected to one end of the primary-side resonant capacitor C1, and the other end of the primary-side resonant capacitor C1 is connected to the AC terminal 2 of the primary-side H-bridge; the input of the primary-side current transformer is the current flowing through the transmitting coil L1, and the output of the primary-side current transformer is connected to the comparison terminal of the primary-side zero-crossing comparator, and the reference terminal of the primary-side zero-crossing comparator is set to zero voltage; the output terminal of the primary-side zero-crossing comparator is connected to the input terminal of the primary-side NOT gate, and the output of the primary-side NOT gate and the output of the primary-side zero-crossing comparator are jointly used as the driving signal of the primary-side H-bridge circuit;

[0011] The secondary-side magnetically integrated self-resonant wireless energy receiving circuit includes: a magnetically integrated receiving coil L2, a secondary-side resonant capacitor C2, a secondary-side H-bridge circuit, a secondary-side current transformer, a secondary-side zero-crossing comparator, a secondary-side NOT gate, and a DC capacitor C3;

[0012] The magnetically integrated receiving coil L2 has three ports, and a secondary-side resonant capacitor C2 is connected in series between the port 1 and the port 3 of the magnetically integrated receiving coil L2; the port 2 of the magnetically integrated receiving coil L2 is connected to the AC terminal 2 of the secondary-side H-bridge of the secondary-side H-bridge circuit; the port 3 of the magnetically integrated receiving coil L2 is connected to the AC terminal 1 of the secondary-side H-bridge of the secondary-side H-bridge circuit; a DC capacitor C3 is connected in series between the DC cathode terminal and the DC anode terminal of the secondary-side H-bridge of the secondary-side H-bridge circuit, and the DC capacitor C3 is connected in parallel with the load; the input of the secondary-side current transformer is the current at the port 2 of the magnetically integrated receiving coil L2, and the output of the secondary-side current transformer is connected to the comparison terminal of the secondary-side zero-crossing comparator, and the reference terminal of the secondary-side zero-crossing comparator is set to zero voltage; the output terminal of the secondary-side zero-crossing comparator is connected to the input terminal of the secondary-side NOT gate, and the output of the secondary-side NOT gate and the output of the secondary-side zero-crossing comparator are jointly used as the driving signal of the secondary-side H-bridge circuit.

[0013] Further, the primary H-bridge circuit is composed of field effect transistors Q1, Q2, Q3, and Q4; the D pole of Q1 is connected to the D pole of Q2 and serves as the positive DC terminal of the primary H-bridge, the S pole of Q3 is connected to the S pole of Q4 and serves as the negative DC terminal of the primary H-bridge, the S pole of Q1 is connected to the D pole of Q3 and serves as the first AC terminal of the primary H-bridge, and the S pole of Q2 is connected to the D pole of Q4 and serves as the second AC terminal of the primary H-bridge.

[0014] Further, the drive signals of Q1 and Q4 are the same, the drive signals of Q2 and Q3 are the same and opposite to the drive signals of Q1 and Q4; the primary drive signal output by the primary zero-crossing comparator is used as the drive signal of Q2 and Q3; the primary complementary drive signal output by the primary NOT gate is used as the drive signal of Q1 and Q4;

[0015] When the current flowing through the transmitting coil L1 flows from the second AC terminal of the primary H-bridge circuit to the first AC terminal of the primary H-bridge circuit, the current flowing through the transmitting coil L1 is greater than 0. At this time, Q2 and Q3 are turned on, and Q1 and Q4 are turned off;

[0016] When the current flowing through the transmitting coil L1 flows from the first AC terminal of the primary H-bridge circuit to the second AC terminal of the primary H-bridge circuit, the current flowing through the transmitting coil L1 is less than 0. At this time, Q2 and Q3 are turned off, and Q1 and Q4 are turned on.

[0017] Further, the secondary H-bridge circuit is composed of field effect transistors Q5, Q6, Q7, and Q8; the D pole of Q5 is connected to the D pole of Q6 and serves as the positive DC terminal of the secondary H-bridge, the S pole of Q7 is connected to the S pole of Q8 and serves as the negative DC terminal of the secondary H-bridge, the S pole of Q5 is connected to the D pole of Q7 and serves as the first AC terminal of the secondary H-bridge, and the S pole of Q6 is connected to the D pole of Q8 and serves as the second AC terminal of the secondary H-bridge.

[0018] Further, the drive signals of Q5 and Q8 are the same, the drive signals of Q6 and Q7 are the same and opposite to the drive signals of Q5 and Q8; the secondary drive signal output by the secondary zero-crossing comparator is used as the drive signal of Q6 and Q7; the secondary complementary drive signal output by the secondary NOT gate is used as the drive signal of Q5 and Q8;

[0019] When the current flow direction at the second port of the magnetically integrated receiving coil L2 is from the second AC terminal to the first AC terminal of the secondary H-bridge circuit of the secondary H-bridge circuit, the current at the second port of the magnetically integrated receiving coil L2 is greater than 0. At this time, Q6 and Q7 are turned on, and Q5 and Q8 are turned off;

[0020] When the current flow direction at the second port of the magnetically integrated receiving coil L2 is from the first AC terminal to the second AC terminal of the secondary H-bridge circuit of the secondary H-bridge circuit, the current at the second port of the magnetically integrated receiving coil L2 is less than 0. At this time, Q6 and Q7 are turned off, and Q5 and Q8 are turned on.

[0021] Further, the magnetically integrated receiving coil L2 is formed by laminating two layers of planar coils and then laminating them on a planar magnetic core. Among them, the planar coil in contact with the planar magnetic core is called the A coil, and the planar coil that sandwiches the A coil together with the planar magnetic core is called the B coil.

[0022] Both the A coil and the B coil are wound around the center of the circle by tightly laminating two Litz wires, and the number of turns of the A coil and the B coil is the same. Among them, the A coil is wound clockwise, and the B coil is wound counterclockwise.

[0023] The outermost Litz wire in the A coil is called the No. 1 wire of the A coil, and the other Litz wire is called the No. 2 wire of the A coil. The tap at the center of the circle after winding the No. 1 wire of the A coil is called the inner tap of the No. 1 wire of the A coil. The tap on the outer side of the circle after winding the No. 1 wire of the A coil is called the outer tap of the No. 1 wire of the A coil. The tap at the center of the circle after winding the No. 2 wire of the A coil is called the inner tap of the No. 2 wire of the A coil. The tap on the outer side of the circle after winding the No. 2 wire of the A coil is called the outer tap of the No. 2 wire of the A coil.

[0024] The outermost Litz wire in the B coil is called the No. 1 wire of the B coil, and the other Litz wire is called the No. 2 wire of the B coil. The tap at the center of the circle after winding the No. 1 wire of the B coil is called the inner tap of the No. 1 wire of the B coil. The tap on the outer side of the circle after winding the No. 1 wire of the B coil is called the outer tap of the No. 1 wire of the B coil. The tap at the center of the circle after winding the No. 2 wire of the B coil is called the inner tap of the No. 2 wire of the B coil. The tap on the outer side of the circle after winding the No. 2 wire of the B coil is called the outer tap of the No. 2 wire of the B coil.

[0025] After laminating the A coil and the B coil, connect the inner tap of the No. 1 wire of the A coil to the inner tap of the No. 2 wire of the B coil, and connect the inner tap of the No. 2 wire of the A coil to the inner tap of the No. 1 wire of the B coil. Connect the outer tap of the No. 1 wire of the A coil to the outer tap of the No. 1 wire of the B coil and use it as the No. 1 port of the magnetically integrated receiving coil L2. Use the outer tap of the No. 2 wire of the A coil as the No. 2 port of the magnetically integrated receiving coil L2. Use the outer tap of the No. 2 wire of the B coil as the No. 3 port of the magnetically integrated receiving coil L2.

[0026] Further, the transmitting coil L1 is formed by laminating a layer of planar coil and a planar magnetic core, and the number of turns of the planar coil in the transmitting coil L1 is twice the number of turns of the A coil in the magnetically integrated receiving coil L2.

[0027] Further, the capacitance value of the primary resonant capacitor C1 is equal to the capacitance value of the secondary resonant capacitor C2.

[0028] The beneficial effects produced by adopting the above technical solutions are as follows:

[0029] The utility model provides a magnetically integrated self - tuning wireless energy transmission device for wireless charging. The wireless energy transmission device directly controls the on - off state of the field - effect transistor through the current direction in the resonant cavity, so that the efficiency of the wireless energy transmission device is the highest in the resonant state. Among them, the frequency of the on - off action of the field - effect transistor is self - excited by the circuit and is consistent with the resonant frequency. Especially when the mutual inductance or the parasitic parameters of the circuit change, the wireless energy transmission device will automatically adjust to the new resonant frequency, and the on - off action of the field - effect transistor synchronously follows through the circuit self - excitation mechanism, thus achieving the self - tuning effect and completely avoiding the hysteresis in the traditional scheme, which is especially suitable for dynamic charging. In addition, the field - effect transistors in the secondary - side H - bridge circuit of the utility model all work in the reverse - conduction state. At this time, the current does not pass through the parasitic diode, avoiding the loss caused by the diode voltage drop and helping to improve the energy - transmission efficiency.

[0030] In the magnetically integrated self - tuning wireless energy transmission device proposed by the utility model, the receiving coil is designed by using the magnetic integration technology. Compared with the existing LCL resonant topology, the utility model adopts an integrated magnetic - core design, integrating two independent coils into the same magnetic - circuit structure, that is, realizing the high integration of electromagnetic components through magnetic - circuit coupling optimization, which helps to reduce the volume and weight of the wireless energy transmission device, thereby improving the power density and providing a more optimized hardware basis for the realization of the self - tuning function. Brief Description of the Drawings

[0031] Figure 1 It is a structural diagram of a magnetically integrated self - tuning wireless energy transmission device in this embodiment;

[0032] Figure 2 It is a schematic diagram of the magnetically integrated receiving coil L2 in this embodiment;

[0033] Figure 3 It is a schematic diagram of the coil winding of the magnetically integrated receiving coil L2 in this embodiment;

[0034] In the figure: 1 - Primary H-bridge circuit; 2 - DC positive terminal of the primary H-bridge; 3 - DC negative terminal of the primary H-bridge; 4 - DC power supply; 5 - AC terminal 1 of the primary H-bridge; 6 - AC terminal 2 of the primary H-bridge; 7 - Primary resonant capacitor; 8 - Transmitting coil; 9 - Primary current transformer; 10 - Primary zero-crossing comparator; 11 - Primary NOT gate; 12 - Magnetically integrated receiving coil; 13 - Port 1 of the magnetically integrated receiving coil; 14 - Port 2 of the magnetically integrated receiving coil; 15 - Port 3 of the magnetically integrated receiving coil; 16 - Secondary current transformer; 17 - Secondary zero-crossing comparator; 18 - Secondary NOT gate; 19 - Secondary resonant capacitor; 20 - Secondary H-bridge circuit; 21 - AC terminal 1 of the secondary H-bridge; 22 - AC terminal 2 of the secondary H-bridge; 23 - DC negative terminal of the secondary H-bridge; 24 - DC positive terminal of the secondary H-bridge; 25 - DC capacitor; 26 - Planar magnetic core; 27 - Line 1 of coil A; 271 - Inner tap of line 1 of coil A; 272 - Outer tap of line 1 of coil A; 28 - Line 2 of coil A; 281 - Inner tap of line 2 of coil A; 282 - Outer tap of line 2 of coil A; 29 - Line 1 of coil B; 30 - Line 2 of coil B. Detailed implementation mode

[0035] The following further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0036] As Figures 1 to 3 shown, this embodiment provides a magnetically integrated self-tuning wireless energy transmission device, which includes: a primary self-resonant wireless energy transmitting circuit and a secondary magnetically integrated self-resonant wireless energy receiving circuit.

[0037] Among them, the primary self-resonant wireless energy transmitting circuit transmits energy to the secondary magnetically integrated self-resonant wireless energy receiving circuit through magnetic coupling.

[0038] The primary self-resonant wireless energy transmitting circuit includes: a primary H-bridge circuit 1, a primary resonant capacitor 7, a transmitting coil 8, a primary current transformer 9, a primary zero-crossing comparator 10, and a primary NOT gate 11.

[0039] As Figure 1 shown, the primary resonant capacitor 7 is denoted as C1, the transmitting coil 8 is denoted as L1, the secondary resonant capacitor 19 is denoted as C2, the magnetically integrated receiving coil 12 is denoted as L2, and the DC capacitor 25 is denoted as C3.

[0040] The primary H-bridge circuit 1 is used to convert the direct current of the input primary self-resonant wireless energy transmitting circuit into alternating current; the primary resonant capacitor 7 and the transmitting coil 8 together form a series resonant circuit for adjusting the resonant state of the primary self-resonant wireless energy transmitting circuit; the transmitting coil 8 is also used to receive the alternating current from the primary H-bridge circuit 1 and transmit it to the secondary magnetic integration self-resonant wireless energy receiving circuit in the form of energy; the primary current transformer 9 is used to collect the current flowing through the transmitting coil 8; the primary zero-crossing comparator 10 is used to detect the zero-crossing point of the current flowing through the transmitting coil 8 and output a driving signal synchronized with the period corresponding to the resonant frequency as the primary driving signal; the primary NOT gate 11 is used to generate a primary complementary driving signal by logically inverting the primary driving signal, and the primary driving signal and the primary complementary driving signal are jointly used as the driving signal of the primary H-bridge circuit 1.

[0041] The primary H-bridge DC anode terminal 2 and the primary H-bridge DC cathode terminal 3 of the primary H-bridge circuit 1 are respectively connected to both ends of the DC power supply 4; the primary H-bridge AC terminal 1 5 of the primary H-bridge circuit 1 is connected to one end of the transmitting coil 8, the other end of the transmitting coil 8 is connected to one end of the primary resonant capacitor 7, and the other end of the primary resonant capacitor 7 is connected to the primary H-bridge AC terminal 2 6; the input of the primary current transformer 9 is the current flowing through the transmitting coil 8, and the output of the primary current transformer 9 is connected to the comparison terminal of the primary zero-crossing comparator 10, and the reference terminal of the primary zero-crossing comparator 10 is set to zero voltage; the output terminal of the primary zero-crossing comparator 10 is connected to the input terminal of the primary NOT gate 11, and the output of the primary NOT gate 11 and the output of the primary zero-crossing comparator 10 are jointly used as the driving signal of the primary H-bridge circuit 1.

[0042] The primary H-bridge circuit 1 is composed of field effect transistors Q1, Q2, Q3, and Q4; where the D pole of Q1 is connected to the D pole of Q2 and serves as the primary H-bridge DC anode terminal 2, the S pole of Q3 is connected to the S pole of Q4 and serves as the primary H-bridge DC cathode terminal 3, the S pole of Q1 is connected to the D pole of Q3 and serves as the primary H-bridge AC terminal 1 5, and the S pole of Q2 is connected to the D pole of Q4 and serves as the primary H-bridge AC terminal 2 6.

[0043] The driving signals of Q1 and Q4 are the same, the driving signals of Q2 and Q3 are the same and opposite to the driving signals of Q1 and Q4; the primary driving signal output by the primary zero-crossing comparator 10 is used as the driving signal of Q2 and Q3; the primary complementary driving signal output by the primary NOT gate 11 is used as the driving signal of Q1 and Q4.

[0044] When the current flowing through the transmitting coil 8 flows from the primary H-bridge AC terminal 2 6 to the primary H-bridge AC terminal 1 5, the current flowing through the transmitting coil 8 is greater than 0. At this time, Q2 and Q3 are turned on, and Q1 and Q4 are turned off.

[0045] When the current flowing through the transmitting coil 8 is from the primary H-bridge AC terminal 1 to the primary H-bridge AC terminal 2, the current flowing through the transmitting coil 8 is less than 0. At this time, Q2 and Q3 are turned off, and Q1 and Q4 are turned on.

[0046] The secondary magnetically integrated self-resonant wireless energy receiving circuit includes: a magnetically integrated receiving coil 12, a secondary resonant capacitor 19, a secondary H-bridge circuit 20, a secondary current transformer 16, a secondary zero-crossing comparator 17, a secondary NOT gate 18, and a DC capacitor 25.

[0047] Wherein the magnetically integrated receiving coil 12 is used to receive energy from the primary self-resonant wireless energy transmitting circuit and transmit it to the secondary H-bridge circuit 20 in the form of alternating current; the secondary resonant capacitor 19 and the magnetically integrated receiving coil 12 together form an LC resonant circuit for adjusting the resonant state of the secondary magnetically integrated self-resonant wireless energy receiving circuit; the secondary H-bridge circuit 20 is used to convert the received alternating current into direct current; the DC capacitor 25 is used to filter the converted direct current and output the filtered DC voltage to the load; the secondary current transformer 16 is used to collect the current flowing through the magnetically integrated receiving coil 12; the secondary zero-crossing comparator 17 is used to detect the zero-crossing point of the current flowing through the magnetically integrated receiving coil 12 and output a driving signal synchronized with the period corresponding to the resonant frequency as the secondary driving signal; the secondary NOT gate 18 is used to generate a secondary complementary driving signal by logically inverting the secondary driving signal, and the secondary driving signal and the secondary complementary driving signal are used together as the driving signal of the secondary H-bridge circuit 20.

[0048] In this embodiment, the period corresponding to the resonant frequency synchronized with the primary driving signal is the same as the period corresponding to the resonant frequency synchronized with the secondary driving signal, and the resonant frequency therein refers to the resonant frequency of the circuit in the entire magnetically integrated self-tuning wireless energy transmission device.

[0049] The magnetic integrated receiving coil 12 has three ports. A secondary resonant capacitor 19 is connected in series between port 13 of the magnetic integrated receiving coil L2 and port 15 of the magnetic integrated receiving coil L2. Port 14 of the magnetic integrated receiving coil L2 is connected to the secondary H-bridge AC terminal 22 of the secondary H-bridge circuit 20. Port 15 of the magnetic integrated receiving coil L2 is connected to the secondary H-bridge AC terminal 21 of the secondary H-bridge circuit 20. A DC capacitor 25 is connected in series between the secondary H-bridge DC negative terminal 23 and the secondary H-bridge DC positive terminal 24 of the secondary H-bridge circuit 20, and the DC capacitor 25 is connected in parallel with the load. The input of the secondary current transformer 16 is the current at port 14 of the magnetic integrated receiving coil L2, and the output of the secondary current transformer 16 is connected to the comparison terminal of the secondary zero-crossing comparator 17. The reference terminal of the secondary zero-crossing comparator 17 is set to zero voltage. The output terminal of the secondary zero-crossing comparator 17 is connected to the input terminal of the secondary NOT gate 18, and the output of the secondary NOT gate 18 and the output of the secondary zero-crossing comparator 17 are jointly used as the drive signal for the secondary H-bridge circuit 20.

[0050] The secondary H-bridge circuit 20 is composed of field effect transistors Q5, Q6, Q7, and Q8. The D pole of Q5 is connected to the D pole of Q6 and serves as the secondary H-bridge DC positive terminal 24. The S pole of Q7 is connected to the S pole of Q8 and serves as the secondary H-bridge DC negative terminal 23. The S pole of Q5 is connected to the D pole of Q7 and serves as the secondary H-bridge AC terminal 21. The S pole of Q6 is connected to the D pole of Q8 and serves as the secondary H-bridge AC terminal 22.

[0051] The drive signals of Q5 and Q8 are the same, and the drive signals of Q6 and Q7 are the same and opposite to the drive signals of Q5 and Q8. Among them, the secondary drive signal output by the secondary zero-crossing comparator 17 is used as the drive signal for Q6 and Q7. The secondary complementary drive signal output by the secondary NOT gate 18 is used as the drive signal for Q5 and Q8.

[0052] When the current flow direction at port 14 of the magnetic integrated receiving coil L2 is from the secondary H-bridge AC terminal 22 to the secondary H-bridge AC terminal 21 of the secondary H-bridge circuit 20, the current at port 14 of the magnetic integrated receiving coil L2 is greater than 0. At this time, Q6 and Q7 are turned on, and Q5 and Q8 are turned off.

[0053] When the current flow direction at port 14 of the magnetic integrated receiving coil L2 is from the secondary H-bridge AC terminal 21 to the secondary H-bridge AC terminal 22 of the secondary H-bridge circuit 20, the current at port 14 of the magnetic integrated receiving coil L2 is less than 0. At this time, Q6 and Q7 are turned off, and Q5 and Q8 are turned on.

[0054] The magnetic integrated receiving coil 12 is formed by laminating two layers of planar coils and then attaching them to the planar magnetic core 26; among them, the planar coil in contact with the planar magnetic core is called the A coil; the planar coil that sandwiches the A coil together with the planar magnetic core is called the B coil.

[0055] Both the A coil and the B coil are wound around the center of the circle by tightly laminating two Litz wires, and the number of turns of the A coil and the B coil is the same. Among them, the A coil is wound clockwise, and the B coil is wound counterclockwise.

[0056] The outermost Litz wire in the A coil is called the No. 1 wire 27 of the A coil, and the other Litz wire is called the No. 2 wire 27 of the A coil; the tap at the center of the circle after winding the No. 1 wire 27 of the A coil is called the inner tap of the No. 1 wire 271 of the A coil; the tap on the outer side of the coil after winding the No. 1 wire 27 of the A coil is called the outer tap of the No. 1 wire 272 of the A coil; the tap at the center of the circle after winding the No. 2 wire 28 of the A coil is called the inner tap of the No. 2 wire 281 of the A coil; the tap on the outer side of the coil after winding the No. 2 wire 28 of the A coil is called the outer tap of the No. 2 wire 282 of the A coil.

[0057] The outermost Litz wire in the B coil is called the No. 1 wire 29 of the B coil, and the other Litz wire is called the No. 2 wire 30 of the B coil; the tap at the center of the circle after winding the No. 1 wire 29 of the B coil is called the inner tap of the No. 1 wire of the B coil; the tap on the outer side of the coil after winding the No. 1 wire 29 of the B coil is called the outer tap of the No. 1 wire of the B coil; the tap at the center of the circle after winding the No. 2 wire 30 of the B coil is called the inner tap of the No. 2 wire of the B coil; the tap on the outer side of the coil after winding the No. 2 wire 30 of the B coil is called the outer tap of the No. 2 wire of the B coil.

[0058] After laminating the A coil and the B coil, connect the inner tap 271 of the No. 1 wire of the A coil to the inner tap of the No. 2 wire of the B coil, and connect the inner tap 281 of the No. 2 wire of the A coil to the inner tap of the No. 1 wire of the B coil; connect the outer tap 272 of the No. 1 wire of the A coil to the outer tap of the No. 1 wire of the B coil and use it as the No. 1 port 13 of the magnetic integrated receiving coil L2; use the outer tap 282 of the No. 2 wire of the A coil as the No. 2 port 14 of the magnetic integrated receiving coil L2; use the outer tap of the No. 2 wire of the B coil as the No. 3 port 15 of the magnetic integrated receiving coil L2.

[0059] The transmitting coil 8 is formed by laminating a layer of planar coil and a planar magnetic core, and the number of turns of the planar coil in the transmitting coil 8 is twice the number of turns of the A coil in the magnetic integrated receiving coil 12.

[0060] The capacitance value of the primary resonant capacitor 7 is equal to the capacitance value of the secondary resonant capacitor 19.

[0061] The following describes a primary usage process of the present utility model in conjunction with the accompanying drawings.

[0062] As Figures 1 to 3 shown, during use, a DC power supply 4 supplies a DC voltage to a primary H-bridge circuit 1 in a primary self-resonant wireless energy transmitting circuit. At this time, Q1 and Q4 in the primary H-bridge circuit 1 are turned on, and Q2 and Q3 are turned off. The current generated in the primary H-bridge circuit 1 flows into a transmitting coil 8. Since the current in the transmitting coil 8 starts to decrease after reaching the peak due to resonance or load reflection, the current in the transmitting coil 8 first increases and then decreases, and finally decreases to zero and switches the current direction. At this time, Q2 and Q3 are turned on, and Q1 and Q4 are turned off. This process repeats, forming an alternating current in the transmitting coil 8 and transmitting energy to a secondary magnetic integration self-resonant wireless energy receiving circuit.

[0063] A magnetic integration receiving coil 12 in the secondary magnetic integration self-resonant wireless energy receiving circuit receives the energy from the primary self-resonant wireless energy transmitting circuit and generates an induced current, and then controls the on and off of Q5, Q6, Q7, and Q8 through the direction of the induced current. Among them, a secondary current transformer 16 is used to measure the current direction of port 14 of the 2nd terminal of the magnetic integration receiving coil L2, and the output of the secondary current transformer 16 is connected to the comparison terminal of a secondary zero-crossing comparator 17, and the reference terminal of the secondary zero-crossing comparator 17 is set to zero voltage; the secondary drive signal output by the secondary zero-crossing comparator 17 is used as the drive signal for Q6 and Q7; the secondary complementary drive signal output by the secondary NOT gate 18 is used as the drive signal for Q5 and Q8. When operating in this way, the current at port 2 of the magnetic integration receiving coil L2 will become a direct current and flow to the load through the turned-on field effect transistor. That is, when the current flow direction at port 14 of the 2nd terminal of the magnetic integration receiving coil L2 is from the secondary H-bridge AC 2nd terminal 22 to the secondary H-bridge AC 1st terminal 21 of the secondary H-bridge circuit 20, the current at port 14 of the 2nd terminal of the magnetic integration receiving coil L2 is greater than 0. At this time, Q6 and Q7 are turned on, and Q5 and Q8 are turned off; when the current flow direction at port 14 of the 2nd terminal of the magnetic integration receiving coil L2 is from the secondary H-bridge AC 1st terminal 21 to the secondary H-bridge AC 2nd terminal 22 of the secondary H-bridge circuit 20, the current at port 14 of the 2nd terminal of the magnetic integration receiving coil L2 is less than 0. At this time, Q6 and Q7 are turned off, and Q5 and Q8 are turned on. During the above operation process, each time the current at port 14 of the 2nd terminal of the magnetic integration receiving coil L2 passes through zero, the switching state of the secondary H-bridge circuit 20 will be switched to ensure that the current always flows through the load unidirectionally, that is, the secondary H-bridge circuit 20 converts the input alternating current into a direct current and flows to the load.

[0064] In this embodiment, the field effect transistors Q1, Q2, Q3, Q4 in the primary H-bridge circuit 1 and the field effect transistors Q5, Q6, Q7, Q8 in the secondary H-bridge circuit 20 all adopt the field effect transistors of the model IMZA65RO10M2H. The primary current transformer 9 and the secondary current transformer 16 both adopt the current transformers of the model TLV3501.

[0065] Finally, it should be noted that: the solutions in the above embodiments are not intended to limit the patent protection scope of the present utility model, and all equivalent implementations or changes made without departing from the present utility model are included in the patent scope of this case.

Claims

1. A magnetically integrated self-tuning wireless energy transmission device, characterized in that: The device comprises: a primary side self-resonant wireless energy transmitting circuit and a secondary side magnetic integrated self-resonant wireless energy receiving circuit; The primary side self-resonant wireless energy transmitting circuit transmits energy to the secondary side magnetically integrated self-resonant wireless energy receiving circuit by magnetic coupling.

2. A magnetically integrated self-tuning wireless energy transmission device according to claim 1, characterized in that: The primary self-resonant wireless energy transmitting circuit comprises: a primary H-bridge circuit, a primary resonant capacitor C1, a transmitting coil L1, a primary current transformer, a primary zero-crossing comparator and a primary NOT gate; The primary H-bridge DC anode terminal and the primary H-bridge DC cathode terminal of the primary H-bridge circuit are respectively connected to the two ends of the DC power supply; the primary H-bridge AC terminal No. 1 of the primary H-bridge circuit is connected to one end of the transmitting coil L1, the other end of the transmitting coil L1 is connected to one end of the primary resonant capacitor C1, and the other end of the primary resonant capacitor C1 is connected to the primary H-bridge AC terminal No. 2; the input of the primary current transformer is the current flowing through the transmitting coil L1, and the output of the primary current transformer is connected to the comparison end of the primary zero-crossing comparator, and the reference end of the primary zero-crossing comparator is set to zero voltage; the output end of the primary zero-crossing comparator is connected to the input end of the primary NOT gate, and the output of the primary NOT gate and the output of the primary zero-crossing comparator are used together as the driving signal of the primary H-bridge circuit.

3. According to claim 2, a magnetically integrated self-tuning wireless energy transmission device is characterized in that: The secondary magnetic integrated self-resonant wireless energy receiving circuit comprises: a magnetic integrated receiving coil L2, a secondary resonant capacitor C2, a secondary H-bridge circuit, a secondary current transformer, a secondary zero-crossing comparator, a secondary NOT gate and a DC capacitor C3; The magnetic integrated receiving coil L2 has three ports, wherein a secondary resonant capacitor C2 is connected in series between port No. 1 of the magnetic integrated receiving coil L2 and port No. 3 of the magnetic integrated receiving coil L2; port No. 2 of the magnetic integrated receiving coil L2 is connected to the secondary H bridge AC terminal No. 2 of the secondary H bridge circuit; port No. 3 of the magnetic integrated receiving coil L2 is connected to the secondary H bridge AC terminal No. 1 of the secondary H bridge circuit; a DC capacitor C3 is connected in series between the secondary H bridge DC cathode terminal of the secondary H bridge circuit and the secondary H bridge DC anode terminal of the secondary H bridge circuit, and the DC capacitor C3 is connected in parallel with the load; the input of the secondary current transformer is the current at port No. 2 of the magnetic integrated receiving coil L2, and the output of the secondary current transformer is connected to the comparison terminal of the secondary zero-crossing comparator, and the reference terminal of the secondary zero-crossing comparator is set to zero voltage; the output terminal of the secondary zero-crossing comparator is connected to the input terminal of the secondary NOT gate, and the output of the secondary NOT gate and the output of the secondary zero-crossing comparator are used together as the driving signal of the secondary H bridge circuit.

4. According to claim 3, a magnetically integrated self-tuning wireless energy transmission device is characterized in that: The primary H-bridge circuit is composed of field effect tubes Q1, Q2, Q3, and Q4; wherein the D pole of Q1 is connected to the D pole of Q2 and serves as the DC anode terminal of the primary H-bridge, the S pole of Q3 is connected to the S pole of Q4 and serves as the DC cathode terminal of the primary H-bridge, the S pole of Q1 is connected to the D pole of Q3 and serves as the AC terminal No. 1 of the primary H-bridge, and the S pole of Q2 is connected to the D pole of Q4 and serves as the AC terminal No. 2 of the primary H-bridge.

5. A magnetically integrated self-tuning wireless energy transmission device according to claim 4, characterized in that: The driving signals of Q1 and Q4 are the same, the driving signals of Q2 and Q3 are the same and opposite to the driving signals of Q1 and Q4; the primary driving signal output by the primary zero-crossing comparator is used as the driving signal of Q2 and Q3; the primary complementary driving signal output by the primary NOT gate is used as the driving signal of Q1 and Q4; When the current flowing through the transmitting coil L1 flows from the primary H-bridge AC terminal 2 to the primary H-bridge AC terminal 1, the current flowing through the transmitting coil L1 is greater than 0. At this time, Q2 and Q3 are turned on, and Q1 and Q4 are turned off. When the current flowing through the transmitting coil L1 flows from the primary H-bridge AC terminal 1 to the primary H-bridge AC terminal 2, the current flowing through the transmitting coil L1 is less than 0. At this time, Q2 and Q3 are turned off, and Q1 and Q4 are turned on.

6. A magnetically integrated self-tuning wireless energy transmission device according to claim 5, characterized in that: The secondary side H-bridge circuit is composed of field effect transistors Q5, Q6, Q7, and Q8; wherein the D pole of Q5 is connected to the D pole of Q6 and serves as the DC anode terminal of the secondary side H-bridge, the S pole of Q7 is connected to the S pole of Q8 and serves as the DC cathode terminal of the secondary side H-bridge, the S pole of Q5 is connected to the D pole of Q7 and serves as the AC terminal 1 of the secondary side H-bridge, and the S pole of Q6 is connected to the D pole of Q8 and serves as the AC terminal 2 of the secondary side H-bridge.

7. A magnetically integrated self-tuning wireless energy transmission device according to claim 6, characterized in that: The driving signals of Q5 and Q8 are the same, and the driving signals of Q6 and Q7 are the same and opposite to the driving signals of Q5 and Q8; wherein the secondary side driving signal output by the secondary side zero-crossing comparator is used as the driving signal of Q6 and Q7; and the secondary side complementary driving signal output by the secondary side NOT gate is used as the driving signal of Q5 and Q8; When the current at port No. 2 of the magnetic integrated receiving coil L2 flows from the secondary side H bridge AC terminal No. 2 of the secondary side H bridge circuit to the secondary side H bridge AC terminal No. 1, the current at port No. 2 of the magnetic integrated receiving coil L2 is greater than 0. At this time, Q6 and Q7 are turned on, and Q5 and Q8 are turned off; When the current at port No. 2 of the magnetic integrated receiving coil L2 flows from the secondary side H bridge AC terminal No. 1 to the secondary side H bridge AC terminal No. 2 of the secondary side H bridge circuit, the current at port No. 2 of the magnetic integrated receiving coil L2 is less than 0. At this time, Q6 and Q7 are turned off, and Q5 and Q8 are turned on.

8. The magnetically integrated self-tuning wireless energy transmission device according to claim 7, characterized in that: The magnetic integrated receiving coil L2 is composed of two layers of planar coils laminated together and then laminated on a planar magnetic core; the planar coil in contact with the planar magnetic core is called A coil; the planar coil that clamps the A coil together with the planar magnetic core is called B coil; The A coil and the B coil are both formed by two Litz wires tightly wound around the center of a circle, and the number of turns of the A coil and the B coil are the same, wherein the A coil is wound clockwise and the B coil is wound counterclockwise; The outermost Litz wire in coil A is called coil 1, and the other Litz wire is called coil 2; the tap located at the center of coil 1 is called the inner tap of coil 1; the tap located outside the coil 1 is called the outer tap of coil 1; the tap located at the center of coil 2 is called the inner tap of coil 2; the tap located outside the coil 2 is called the outer tap of coil 2; The outermost Litz wire in the B coil is called the No. 1 wire of the B coil, and the other Litz wire is called the No. 2 wire of the B coil; the tap located at the center of the circle after the No. 1 wire of the B coil is wound is called the inner tap of the No. 1 wire of the B coil; the tap located outside the circle after the No. 1 wire of the B coil is wound is called the outer tap of the No. 1 wire of the B coil; the tap located at the center of the circle after the No. 2 wire of the B coil is wound is called the inner tap of the No. 2 wire of the B coil; the tap located outside the circle after the No. 2 wire of the B coil is wound is called the outer tap of the No. 2 wire of the B coil; After the A coil and the B coil are attached, the inner tap of line 1 of the A coil is connected to the inner tap of line 2 of the B coil, and the inner tap of line 2 of the A coil is connected to the inner tap of line 1 of the B coil; the outer tap of line 1 of the A coil is connected to the outer tap of line 1 of the B coil and serves as port 1 of the magnetic integrated receiving coil L2; the outer tap of line 2 of the A coil is used as port 2 of the magnetic integrated receiving coil L2; the outer tap of line 2 of the B coil is used as port 3 of the magnetic integrated receiving coil L2.

9. A magnetically integrated self-tuning wireless energy transmission device according to claim 8, characterized in that: The transmitting coil L1 is formed by laminating a layer of planar coil and a planar magnetic core, and the number of turns of the planar coil in the transmitting coil L1 is twice the number of turns of the A coil in the magnetic integrated receiving coil L2.

10. A magnetically integrated self-tuning wireless energy transmission device according to claim 9, characterized in that: The capacitance of the primary resonant capacitor C1 is equal to the capacitance of the secondary resonant capacitor C2.

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