Electromagnetic energy coupling conversion transmission system
By adopting the ‘Tian’ type magnetic coupling mechanism and LCC-S compensation topology in the wireless charging system, the problem of complex design of the transmitter and insufficient anti-offset capability is solved, and flexible power supply for dual loads and efficient anti-offset performance is achieved.
Patent Information
- Application Number
- CN202510015532.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-05-13
AI Technical Summary
The existing wireless charging system is designed in a complex manner at the transmitter end, which limits its widespread use in practical applications and is difficult to achieve comprehensive anti-offset capability improvement.
The ‘field’ type magnetic coupling mechanism with strong anti-offset performance is used as the energy transmitting end, and the LCC-S compensation topology is used to supply power to the second receiving end through the first receiving end as an energy transfer station, realizing flexible power supply for dual loads.
Improves the resistance of wireless charging systems to offsets, ensures the stability and efficiency of power supply in mobile situations, and is suitable for powering both monitors and mobile phones.
Smart Images
Figure CN119995187A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a coupling conversion transmission system, belonging to the technical field of electricity. Background Art
[0002] At present, most traditional desktop monitors rely on wired power supplies, which often results in multiple wires crisscrossing on the desktop, bringing safety risks of leakage and electric shock. The introduction of wireless charging technology can effectively solve this problem. This technology uses an energy transmitter placed on the desktop to power an energy receiving device built into the display through a spatial magnetic field. It is not only flexible, safe, but also quite reliable. However, considering that the user may move the display, resulting in the inability to accurately align the transmitter and the receiver, the wireless charging system needs to have a strong offset tolerance to ensure the stability and efficiency of the power supply. At the same time, as wireless charging of smartphones has gradually become the norm, the high cost of wireless chargers and the strict requirements for charging positions have affected the user experience. In order to maximize the potential of the display wireless charging system, the present invention aims to develop a new wireless charging system that can power the display and the mobile phone at the same time and has strong anti-offset characteristics.
[0003] Common magnetic coupling mechanism designs are mainly square or circular, and the sizes of the transmitter and receiver are usually equal or similar. Although this design can provide a higher coupling coefficient in the central area, when the receiver is offset, the coupling coefficient will drop significantly, which will lead to a significant reduction in the power and efficiency of the system. In response to this problem, relevant research literature has proposed design schemes such as DD-type coils, DDQ-type coils and tripolar coils. These schemes enhance the anti-offset performance by generating a uniform magnetic field, but their structures are relatively complex and it is difficult to achieve a full range of anti-offset capabilities. In addition, the current magnetic coupling mechanism is mostly used in a "one-to-one" wireless charging mode, that is, one transmitter corresponds to one receiver. Although existing literature has explored the "one-to-many" wireless charging mode, the design of the transmitter is usually more complex, which limits its widespread use in practical applications. Summary of the invention
[0004] In order to solve the problem that the existing transmitting end has a complex structure and limits its use in practical applications, the present invention further proposes an electromagnetic energy coupling conversion transmission system.
[0005] The technical solution adopted by the present invention to solve the above problems is: the present invention comprises a transmitting end, a magnetic coupling mechanism, a first receiving end and a second receiving end;
[0006] The transmitting end provides coordinated power supply to the first receiving end and the second receiving end simultaneously through a magnetic coupling mechanism.
[0007] Furthermore, the transmitter is composed of a DC power supply, a full-bridge converter and an LCC compensation network.
[0008] Furthermore, the first receiving end is composed of a compensation circuit, a rectifier bridge, a filter capacitor and a Buck converter, wherein the Buck converter is composed of a metal oxide semi-conductor field effect transistor QB1, a diode DB1, a filter inductor LB1 and a filter capacitor CB1.
[0009] Furthermore, the second receiving end is composed of a compensation capacitor, a rectifier bridge, a filter capacitor and a Buck conversion circuit, wherein the Buck conversion circuit is composed of a metal oxide semi-conductor field effect transistor QB2, a diode DB2, a filter inductor LB2 and a filter capacitor CB2.
[0010] Further, the magnetic coupling mechanism includes a transmitting coil core, a transmitting coil, a first receiving end coil, a second receiving end coil and a second receiving end core;
[0011] The transmitting coil is laid on the upper surface of the transmitting coil magnetic core, the first receiving end coil is arranged on the upper surface of the transmitting coil, the second receiving end coil is arranged on the upper surface of the first receiving end coil, and the second receiving end magnetic core is arranged on the upper surface of the second receiving end coil.
[0012] Furthermore, the transmitting coil is composed of a first unit coil, a second unit coil, a third unit coil and a fourth unit coil, and the first unit coil, the second unit coil, the third unit coil and the fourth unit coil are arranged in a grid shape.
[0013] Furthermore, the first receiving end coil is a square frame, and the first receiving end coil is arranged in the middle of the upper surface of the transmitting coil.
[0014] Furthermore, the second receiving end coil is a square, the second receiving end coil is arranged at the lower right corner of the upper surface of the first receiving end coil, and the second receiving end coil is located inside the second unit coil.
[0015] The beneficial effects of the present invention are as follows: the present invention adopts a "field"-shaped magnetic coupling mechanism with strong anti-offset performance as the energy transmitting end, and uses an LCC-S compensation topology structure. The system supplies power to the first receiving end (integrated in the display base). During this process, the first receiving end acts as an energy transfer station to power the second receiving end (mobile phone), thereby realizing flexible power supply for dual loads. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic diagram of the circuit topology of the present invention;
[0017] Figure 2 It is a schematic diagram of the mutual inductance model of the circuit topology;
[0018] Figure 3is a structural schematic diagram of a magnetic coupling mechanism;
[0019] Figure 4 is a schematic diagram of the positional relationship between the first receiving coil and the second receiving coil;
[0020] Figure 5 It is a schematic diagram of simulation results between different offset distances and mutual inductance values;
[0021] Figure 6 a is a schematic diagram of the voltage / current waveform of load 1 when facing forward (target value 12V / 4A);
[0022] Figure 6 b is the voltage / current waveform diagram of load 2 when facing (target value 5V / 2.5A);
[0023] Figure 6 c is a schematic diagram of the voltage / current waveform of load 1 during offset;
[0024] Figure 6 d is a schematic diagram of the voltage / current waveform of load 2 during offset. DETAILED DESCRIPTION
[0025] Specific implementation method 1: Figure 1 and Figure 2 As shown, an electromagnetic energy coupling conversion transmission system includes a transmitting end, a magnetic coupling mechanism, a first receiving end and a second receiving end;
[0026] The transmitting end provides coordinated power supply to the first receiving end and the second receiving end simultaneously through a magnetic coupling mechanism.
[0027] The first receiving end is connected to the equivalent load Ro1, and the second receiving end is connected to the equivalent complex Ro2.
[0028] Specific implementation method 2: Figure 1 and Figure 2 As shown, the transmitter consists of a DC power supply, a full-bridge converter and an LCC compensation network.
[0029] Specific implementation method three: Figure 1 and Figure 2 As shown, the first receiving end is composed of a compensation circuit, a rectifier bridge, a filter capacitor and a Buck converter, wherein the Buck converter is composed of a metal oxide semi-conductor field effect transistor QB1, a diode DB1, a filter inductor LB1 and a filter capacitor CB1.
[0030] Specific implementation method four: Figure 1 and Figure 2As shown, the second receiving end is composed of a compensation capacitor, a rectifier bridge, a filter capacitor and a Buck conversion circuit, wherein the Buck conversion circuit is composed of a metal oxide semi-conductor field effect transistor QB2, a diode DB2, a filter inductor LB2 and a filter capacitor CB2.
[0031] Specific implementation method five: Figure 3 As shown, the magnetic coupling mechanism includes a transmitting coil core 1, a transmitting coil 2, a first receiving end coil 3, a second receiving end coil 4 and a second receiving end magnetic core 5;
[0032] The transmitting coil 2 is laid on the upper surface of the transmitting coil magnetic core 1, the first receiving end coil 3 is arranged on the upper surface of the transmitting coil 2, the second receiving end coil 4 is arranged on the upper surface of the first receiving end coil 3, and the second receiving end magnetic core 5 is arranged on the upper surface of the second receiving end coil 4.
[0033] Specific implementation method six: Figure 3 As shown, the transmitting coil 2 is composed of a first unit coil 201, a second unit coil 202, a third unit coil 203 and a fourth unit coil 204, and the first unit coil 201, the second unit coil 202, the third unit coil 203 and the fourth unit coil 204 are arranged in a grid shape.
[0034] Specific implementation method seven: Figure 3 As shown, the first receiving end coil 3 is a square frame, and the first receiving end coil 3 is arranged in the middle of the upper surface of the transmitting coil 2.
[0035] Specific implementation method eight: Figure 3 As shown, the second receiving end coil 4 is a square, the second receiving end coil 4 is arranged at the lower right corner of the upper surface of the first receiving end coil 3 , and the second receiving end coil 4 is located inside the second unit coil 202 .
[0036] How it works
[0037] The voltage output by the DC power supply is converted into an AC power with a frequency of 85kHz by a full-bridge inverter (this frequency can be adjusted according to the needs of different systems), and then sent out by the transmitting coil in the form of an alternating magnetic field through the LCC compensation network. The receiving end 1 receives the energy transmitted by the transmitting end through electromagnetic induction, and after series compensation, it is rectified and filtered by a full-bridge and reduced in voltage by a Buck converter to provide power for the desktop monitor. The receiving end 2 also receives the energy relayed from the receiving end 1 through electromagnetic induction, and after series compensation, it is rectified and filtered by a full-bridge and reduced in voltage by a Buck converter to power the smartphone. In this process, the control system components of the circuit monitor the output voltage and current and regulate them to achieve constant voltage power supply and protect the circuit from abnormal conditions such as short circuit and overcurrent.
[0038] Figure 2 The mutual inductance model of the circuit topology proposed in the present invention is shown. In this model, Us represents the equivalent output voltage source of the full-bridge inverter, I1p represents the current flowing through the inductor Lp, and i1 is the current flowing through the inductor L1. M1 represents the mutual inductance between the transmitter and the receiver 1, and M2 represents the mutual inductance between the transmitter and the receiver 2. M12 represents the mutual inductance between the two receivers. i21 refers to the current flowing through L21 in the receiver 1, and i22 refers to the current flowing through L22 in the receiver 2. Re1 and Re2 represent the AC equivalent loads of the receivers 1 and 2 respectively after the impedance adjustment of the rectifier bridge and the Buck converter.
[0039] like Figure 2 As shown, Kirchhoff's law can be obtained:
[0040]
[0041] From the resonance relationship:
[0042]
[0043] Substituting formula (2) into formula (1), we get:
[0044]
[0045] Solving formula (3) yields:
[0046]
[0047] Converted to valid value form:
[0048]
[0049] In formula (1) to formula (6), i 1p Represents the current flowing through the inductor L p The current flowing through the inductor L1 is i1, while M1 represents the mutual inductance between the transmitter and the receiver 1, and M2 represents the mutual inductance between the transmitter and the receiver 2. 12 represents the mutual inductance between the two receiving ends. 21 Refers to the L flowing through the receiving end 1 21 The current, i 22 Refers to the L flowing through the receiving end 2 22 The current R e1 and R e2 They represent the AC equivalent loads of receiving ends 1 and 2 after impedance adjustment by the rectifier bridge and Buck converter, u c1 and u c2 Represents R e1 and R e2The voltage at both ends; j is the "imaginary unit" used in complex numbers; ω is the operating angular frequency of the system, and its formula is ω = 2πf; U in is the DC bus voltage of the system; D is the duty cycle of the buck converter;
[0050] As can be seen from the above formulas, the currents Io1 and Io2 on Ro1 and Ro2 are related to parameters such as the load size, power supply voltage, and mutual inductance. When the parameters of the system (such as the DC input voltage, operating frequency, and mutual inductance value) are fixed, if Ro1 and Ro2 remain unchanged, in order to make the load obtain a relatively stable power when the secondary coil moves, it is necessary to minimize the change range of the mutual inductance value during the movement of the secondary coil. This can enhance the resistance of the wireless charging system to position offset, thereby improving its performance.
[0051] As Figure 3 shown, the transmitting coil, receiving coil 1, and receiving coil 2 are all rectangular coils;
[0052] The area of receiving coil 1 should be smaller than the overall area of the "field"-shaped transmitting coil, but larger than the area of each "square"-shaped small transmitting coil, so as to ensure that receiving coil 1 can receive the magnetic fields emitted by the four coils forming the "field" shape at the same time;
[0053] The area of receiving coil 2 should be smaller than the area of receiving coil 1, so as to ensure that receiving coil 2 can completely receive the magnetic field emitted by receiving coil 1;
[0054] During use, the transmitting coil should be installed under the tabletop, receiving coil 1 is located above the tabletop, and receiving coil 2 is located above receiving coil 1; when in use, the transmitting coil is fixed under the tabletop, and receiving coil 1 and receiving coil 2 can move arbitrarily above the tabletop; to ensure the magnetic field energy transmission effect, receiving coil 1 should be located in the vertical area above the "field"-shaped transmitting coil, and receiving coil 2 should be located in the vertical area above receiving coil 1.
[0055] Figure 3 In, according to the current direction in the transmitting coil, four traditional square coils are connected in sequence to form a "field"-shaped coupling mechanism, which not only reduces the edge effect to a certain extent, but also can generate a more uniform and stable magnetic field. In addition, receiving unit 2 can be at any position of receiving coil 1.
[0056] Circuit topology
[0057] The transmitting - end structure of the present invention includes a DC power supply Ubus, a full - bridge converter (composed of MOSFETs Q1 to Q4), and an LCC compensation network (including inductor Lp and capacitors Cp, C1). The magnetic - coupling mechanism consists of a transmitting coil (L1) and two receiving coils (L21 and L22). The design of receiving - end 1 includes a compensation capacitor (C21), a rectifier bridge (composed of D11 to D41), a filter capacitor (Co1), and a Buck converter (composed of MOSFET QB1, diode DB1, filter inductor LB1, and filter capacitor CB1), and is connected to an equivalent load Ro1 (i.e., a desktop monitor). Receiving - end 2 consists of a compensation capacitor (C22), a rectifier bridge (composed of D12 to D42), a filter capacitor (Co2), and a Buck - conversion circuit (composed of MOSFET QB2, diode DB2, filter inductor LB2, and filter capacitor CB2), and is connected to an equivalent load Ro2 (i.e., a smartphone). In addition, the entire circuit system also includes necessary circuit components for control, such as microcontrollers and sensors, etc.
[0058] Embodiment
[0059] This part of the embodiment is described with the magnetic - coupling mechanism in Table 1.
[0060] Table 1 Parameters of the "field" - type magnetic - coupling mechanism
[0061]
[0062]
[0063] When the "field" - type magnetic - coupling mechanism has offsets in the x - axis and y - axis directions, the simulation results of the offset distance and M1, M2, and M12 are as Figure 5 shown. For example, when the offset distance is ±50 mm in the x - axis direction, the change ranges of M1 and M2 are approximately between 27 μH and 32 μH and between 0 and 7 μH, respectively. At the same time, since the coil positions of receiving - end 1 and receiving - end 2 are relatively fixed, M12 remains at about 40 μH. On the one hand, the coil of receiving - end 1 mainly obtains energy from the transmitting coil, while the coil of receiving - end 2 mainly obtains energy from the coil of receiving - end 1 (i.e., receiving - end 1 serves as an energy relay station); on the other hand, since M1 and M12 are relatively stable during the offset, the power obtained by receiving - end 1 and receiving - end 2 is also relatively stable. A similar situation also applies to the offset in the y - axis direction. Therefore, this magnetic - coupling mechanism can transmit relatively stable power within a range of 100 * 100 mm in the central area.
[0064] Embodiment of the electrical characteristics of the dual - receiving - end wireless charging system
[0065] The system operating frequency is selected as 85kHz, and the DC power supply voltage is selected as 24V. To simulate the actual situation, the two receiving ends are respectively set with a rectifier bridge and a buck type DC-DC circuit, and a controller is designed for voltage stabilization. Among them, the receiving end voltage is 12V, the current is 4A, simulating a computer display screen, and the second receiving coil outputs a voltage of 5V and a current of 2.5A, simulating a mobile phone charger. Figure 6 The voltage / current waveforms of the two loads when the primary and secondary are fully aligned. It can be seen that both loads have reached the rated voltage, and the magnetic coupling mechanism can meet the requirements of wireless charging of dual loads at the same time.
[0066] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.
Claims
1. An electromagnetic energy coupling conversion transmission system, characterized in that: It includes a transmitting end, a magnetic coupling mechanism, a first receiving end and a second receiving end; The transmitting end provides coordinated power supply to the first receiving end and the second receiving end simultaneously through a magnetic coupling mechanism.
2. The electromagnetic energy coupling conversion transmission system according to claim 1, characterized in that: The transmitter consists of a DC power supply, a full-bridge converter and an LCC compensation network.
3. The electromagnetic energy coupling conversion transmission system according to claim 1, characterized in that: The first receiving end is composed of a compensation circuit, a rectifier bridge, a filter capacitor and a Buck converter, wherein the Buck converter is composed of a metal oxide semi-conductor field effect transistor QB1, a diode DB1, a filter inductor LB1 and a filter capacitor CB1.
4. The electromagnetic energy coupling conversion transmission system according to claim 1, characterized in that: The second receiving end is composed of a compensation capacitor, a rectifier bridge, a filter capacitor and a Buck conversion circuit, wherein the Buck conversion circuit is composed of a metal oxide semi-conductor field effect transistor QB2, a diode DB2, a filter inductor LB2 and a filter capacitor CB2.
5. The electromagnetic energy coupling conversion transmission system according to claim 1, characterized in that: The magnetic coupling mechanism comprises a transmitting coil magnetic core (1), a transmitting coil (2), a first receiving end coil (3), a second receiving end coil (4) and a second receiving end magnetic core (5); The transmitting coil (2) is laid on the upper surface of the transmitting coil magnetic core (1), the first receiving end coil (3) is arranged on the upper surface of the transmitting coil (2), the second receiving end coil (4) is arranged on the upper surface of the first receiving end coil (3), and the second receiving end magnetic core (5) is arranged on the upper surface of the second receiving end coil (4).
6. The electromagnetic energy coupling conversion transmission system according to claim 5, characterized in that: The transmitting coil (2) is composed of a first unit coil (201), a second unit coil (202), a third unit coil (203) and a fourth unit coil (204); the first unit coil (201), the second unit coil (202), the third unit coil (203) and the fourth unit coil (204) are arranged in a grid shape.
7. The electromagnetic energy coupling conversion transmission system according to claim 5, characterized in that: The first receiving end coil (3) is a square frame, and the first receiving end coil (3) is arranged in the middle of the upper surface of the transmitting coil (2).
8. The electromagnetic energy coupling conversion transmission system according to claim 5, characterized in that: The second receiving end coil (4) is a square, is arranged at the lower right corner of the upper surface of the first receiving end coil (3), and is located inside the second unit coil (202).