Magnetoelectric integrated hybrid wireless power transmission system

Abstract

The invention discloses a magnetoelectric integrated hybrid wireless power transmission system, which integrates two pairs of frame-shaped polar plates and two planar loose coupling transformers, not only serves as a compensation circuit, but also transmits energy, improves the system compactness, increases the transmitted energy, and realizes constant output current. Wherein the two pairs of frame type polar plates serve as electric field coupling energy transmission channels, the primary side loose coupling transformer is composed of two vertical DD coils and a horizontal DD coil, and the secondary side loose coupling transformer is composed of two Q coils and a horizontal DD coil. The two vertical DD coils of the primary side loose coupling transformer and the two Q coils of the secondary side loose coupling transformer serve as compensation circuits, and the horizontal DD coils of the primary side loose coupling transformer and the secondary side loose coupling transformer serve as magnetic field coupling energy transmission channels. Compared with a conventional wireless electric energy transmission system of a solenoid four-coil compensation polar plate, the magnetoelectric integrated hybrid wireless electric energy transmission system is higher in compactness and higher in power density.

Description

Technical Field

[0001] The invention belongs to the field of wireless power transmission technology, and in particular relates to a magneto-electric integrated hybrid wireless power transmission system. Background Art

[0002] Near-field wireless power transmission systems can be divided into magnetic field coupling wireless power transmission systems and electric field coupling wireless power transmission systems according to the coupling mode. Among them, electric field coupling wireless power transmission has been increasingly studied because of its light weight, low cost, flexible shape design, good anti-deviation characteristics, and no eddy current loss generated by metal around it. However, the dielectric constant of the electric field coupling wireless power transmission system is 10 orders of magnitude lower than that of the magnetic field coupling wireless power transmission system. -6 , so its energy density is low. The Chinese invention patent announcement document with the authorized patent number ZL106300697B provides a compensation network in which the primary and secondary sides respectively use loosely coupled transformers for series compensation, but because the loosely coupled transformer is composed of two solenoid coils, the overall power density of the system is low. In order to solve this problem, the loosely coupled transformer of the present invention is composed of two planar coils and integrated into the electric field coupling mechanism, so that the system is more compact, and not only the loosely coupled transformer is used as a compensation circuit, but also it is used for energy transmission, forming a magneto-electric integrated hybrid wireless power transmission system, which further improves the transmission power of the system. Summary of the invention

[0003] The purpose of the present invention is to design a hybrid wireless power transmission system with compact coupling mechanism structure and magneto-electric integration. To achieve the above purpose, the technical solution adopted by the present invention is:

[0004] The hybrid wireless power transmission system of magneto-electric integration includes: a high-frequency full-bridge inverter circuit, a primary compensation circuit including two inductors and one capacitor, a capacitive coupler including two emitter plates and two receiver plates, a secondary compensation circuit including two inductors and one capacitor, a rectifier circuit and a load resistor R L . Capacitor C in the primary compensation circuit f1 The inductor L1 is connected in series with the inverter circuit, and the inductor L2 and the inductor L P Connected in series at both ends of the emitter plate, the inductor L1 and the inductor L2 form a loosely coupled transformer under the mutual inductance M1; the capacitor C in the secondary compensation circuit f2 The inductor L4 is connected to the load resistor R L Phase connected, inductor L3 and inductor L S Connected in series at both ends of the receiving plate, the inductor L3 and the inductor L4 form a loosely coupled transformer under the mutual inductance M3; P As the transmitting coil and inductor L SAs a receiving coil, it forms a magnetic coupling mechanism under the mutual inductance M2. The input voltage of the high-frequency inverter circuit is V dc , the effective value of the fundamental component of the output voltage of the high-frequency full-bridge inverter circuit is U1.

[0005] A coupling mechanism of a magneto-electric integrated hybrid wireless power transmission system, in which coils and plates are distributed in four planes Plane1, Plane2, Plane3, and Plane4. Plane1, Plane2, and Plane3 are very close to each other and together constitute the transmitting side. The DD-type coil in Plane1 is the transmitting side compensation network inductor L1, the outermost in Plane2 is the transmitting side plates P1 and P2, the inner DD-type coil is the transmitting side compensation network inductor L2, and the DD-type coil in Plane3 is the transmitting side transmitting coil L P Plane 4 is the receiving side, the outermost is the receiving side plates P3 and P4, and the inner side is the Q-type receiving side receiving coil L4, the Q-type receiving side compensation network inductor L3, the DD-type receiving side compensation network inductor L S ; Among them, coil L1 and coil L2 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, coil L2 and coil L1 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, the mutual inductance is M1; coil L3 and coil L4 are coupled to each other, and coil L1, coil L2, and coil L P and coil L S Decoupled from each other, coil L4 and coil L3 are coupled to each other, and coil L1, coil L2, coil L P and coil L S Mutually decoupled, mutual inductance is M2; coil L P With coil L S Mutually coupled, and mutually decoupled from coils L1, L2, L3, and L4. S With coil L P They are coupled to each other and decoupled from coils L1, L2, L3 and L4, and the mutual inductance is M3.

[0006] In the equivalent circuit of a magneto-electric integrated hybrid wireless power transmission system, the equivalent T model of the capacitive coupler includes the capacitor C A , capacitor C B and capacitor C CThe equivalent model of the loosely coupled transformer T of inductance L1 and inductance L2 under mutual inductance M1 includes inductance L1-M1, inductance L2-M1 and mutual inductance M1. The equivalent model of the loosely coupled transformer T of inductance L3 and inductance L4 under mutual inductance M3 includes inductance L3-M3, inductance L4-M3 and mutual inductance M3. The transmitting coil L P and receiving coil L S The voltage source equivalent model of the magnetic coupling mechanism under the mutual inductance M2 includes the equivalent inductance L of the transmitting coil. P , the equivalent inductance L of the receiving coil S , the excitation voltage source U on the transmitting side M1 and the excitation voltage source U on the receiving side M2 , where U M1 =jω0M2I3,U M2 =jω0M2I2, the currents of the four loops are I1, I2, I3, and I4 respectively, and the positive direction of the current is clockwise. ω0 is the resonant angular frequency of the system.

[0007] In the parameter design of the equivalent circuit of a magneto-electric integrated hybrid wireless power transmission system, the resonant frequency is:

[0008]

[0009] The currents of the four loops are I1, I2, I3, and I4, respectively, and the current direction is clockwise. The transfer matrix of the equivalent circuit is:

[0010]

[0011] From (2), the system output current I4 is:

[0012]

[0013] The input impedance of the circuit is:

[0014]

[0015] Through the above parameter and structural design, the output current of the circuit is constant and does not change with the change of resistance. The input impedance of the circuit is purely resistive, achieving zero phase angle input and eliminating unnecessary cross coupling between coils.

[0016] Compared with the prior art, the present invention has the following significant advantages: the present invention integrates the four coils in the loosely coupled transformer compensation network in the electric field resonance wireless power transmission system into the electric field coupling mechanism, and transmits energy at the same time, which not only improves the compactness of the system, but also improves the system transmission power and increases the overall power density of the system.

[0017] The following is a detailed description with reference to the accompanying drawings in conjunction with embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A topology structure of a magneto-electrically integrated hybrid wireless power transfer system;

[0019] Figure 2 A schematic diagram of the coupling mechanism of a magneto-electric integrated hybrid wireless power transmission system;

[0020] Figure 3 A coupling mechanism structure diagram of a magneto-electric integrated hybrid wireless power transmission system;

[0021] Figure 4 A side view of a coupling mechanism of a magneto-electrically integrated hybrid wireless power transfer system;

[0022] Figure 5 A top view of a coupling mechanism of a magneto-electrically integrated hybrid wireless power transmission system;

[0023] Figure 6 It is an equivalent circuit of a magneto-electric integrated hybrid wireless power transmission system;

[0024] Figure 7 The relationship between the load output current and the load resistance of a magneto-electric integrated hybrid wireless power transmission system;

[0025] Figure 8 The voltage and current waveforms of the inverter output and the secondary-side rectifier bridge input when the load is 20Ω for a hybrid wireless power transfer system with magneto-electric integration. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, the hybrid wireless power transmission system of magneto-electric integration includes: a high-frequency full-bridge inverter circuit, a primary compensation circuit including two inductors and one capacitor, a capacitive coupler including two emitter plates and two receiver plates, a secondary compensation circuit including two inductors and one capacitor, a rectifier circuit and a load resistor R L . Capacitor C in the primary compensation circuit f1 The inductor L1 is connected in series with the inverter circuit, and the inductor L2 and the inductor L P Connected in series at both ends of the emitter plate, the inductor L1 and the inductor L2 form a loosely coupled transformer under the mutual inductance M1; the capacitor C in the secondary compensation circuit f2 The inductor L4 is connected to the load resistor R L Phase connected, inductor L3 and inductor L S Connected in series at both ends of the receiving plate, the inductor L3 and the inductor L4 form a loosely coupled transformer under the mutual inductance M3; PAs the transmitting coil and inductor L S As a receiving coil, it forms a magnetic coupling mechanism under the mutual inductance M2. The input voltage of the high-frequency inverter circuit is V dc , the effective value of the fundamental component of the output voltage of the high-frequency full-bridge inverter circuit is U1.

[0028] like Figure 2 As shown, the coupling mechanism of a magneto-electric integrated hybrid wireless power transmission system has coils and plates distributed in four planes Plane1, Plane2, Plane3, and Plane4. The distances between Plane1, Plane2, and Plane3 are very small, and together they constitute the transmitting side. The DD-type coil in Plane1 is the transmitting side compensation network inductor L1, the outermost in Plane2 is the transmitting side plates P1 and P2, the inner DD-type coil is the transmitting side compensation network inductor L2, and the DD-type coil in Plane3 is the transmitting side transmitting coil L P Plane 4 is the receiving side, the outermost is the receiving side plates P3 and P4, and the inner side is the Q-type receiving side receiving coil L4, the Q-type receiving side compensation network inductor L3, the DD-type receiving side compensation network inductor L S ; Among them, coil L1 and coil L2 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, coil L2 and coil L1 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, the mutual inductance is M1; coil L3 and coil L4 are coupled to each other, and coil L1, coil L2, and coil L P and coil L S Decoupled from each other, coil L4 and coil L3 are coupled to each other, and coil L1, coil L2, coil L P and coil L S Mutually decoupled, mutual inductance is M2; coil L P With coil L S Mutually coupled, and mutually decoupled from coils L1, L2, L3, and L4. S With coil L P They are coupled to each other and decoupled from coils L1, L2, L3 and L4, and the mutual inductance is M3.

[0029] like Figure 3 As shown, a coupling mechanism structure diagram of a magneto-electric integrated hybrid wireless power transmission system, the lower part is the transmitting end of the coupling mechanism, and the upper part is the receiving end.

[0030] like Figure 4As shown, in a side view of a coupling mechanism of a magneto-electrically integrated hybrid wireless power transmission system, the coils and pole plates of the coupling mechanism are distributed in four planes, the transmitting end includes plane Plane1, plane Plane2 and plane Plane3, and the receiving end includes plane Plane4.

[0031] like Figure 5 As shown, a top view of a coupling mechanism of a magneto-electric integrated hybrid wireless power transmission system, that is, a top view of a plane Plane4, includes two receiving side plates and three coils, from the outside to the inside, the DD-type receiving side receiving coil L S , Q-type receiving side compensation network inductor L3, Q-type receiving side compensation network inductor L S .

[0032] like Figure 6 As shown in the equivalent circuit of a magneto-electric integrated hybrid wireless power transmission system, the equivalent T model of the capacitive coupler includes the capacitor C A , capacitor C B and capacitor C C The equivalent model of the loosely coupled transformer T of inductance L1 and inductance L2 under mutual inductance M1 includes inductance L1-M1, inductance L2-M1 and inductance M1. The equivalent model of the loosely coupled transformer T of inductance L3 and inductance L4 under mutual inductance M3 includes inductance L3-M3, inductance L4-M3 and inductance M3. The transmitting coil L P and receiving coil L S The voltage source equivalent model of the magnetic coupling mechanism under the mutual inductance M2 includes the equivalent inductance L of the transmitting coil. P , the equivalent inductance L of the receiving coil S , the excitation voltage source U on the transmitting side M1 and the excitation voltage source U on the receiving side M2 , where U M1 =jω0M2I3,U M2 =jω0M2I2, the currents of the four loops are I1, I2, I3, and I4, and the current direction is clockwise. ω0 is the resonant angular frequency of the system. In the parameter design of the equivalent circuit, the resonant frequency is:

[0033]

[0034] The currents of the four loops are I1, I2, I3, and I4, respectively, and the current direction is clockwise. The transfer matrix of the equivalent circuit is:

[0035]

[0036] From (2), the system output current I4 is:

[0037]

[0038] The input impedance of the circuit is:

[0039]

[0040] Through the above parameter and structural design, the output current of the circuit is constant and does not change with the change of resistance. The input impedance of the circuit is purely resistive, achieving zero phase angle input and eliminating unnecessary cross coupling between coils.

[0041] Example: Simulation and experimental results analysis.

[0042] When the capacitor C in the T equivalent model of the capacitive coupler A =1.560nF, capacitor C B =2.824nF, and capacitor C C =2.282nF, the transmitting coil L P =7.266μH, receiving coil L S =7.266μH, the compensation network parameters are: C f1 =1.412nF, C f2 =1.978nF, L1=17.941μH, L2=17.941μH, L3=12.804μH, L4=12.804μH, M1=8.971μH, M2=6.539μH, M3=3.834μH.

[0043] like Figure 7 As shown in the figure, when the load resistance changes from 20Ω to 100Ω, the load current I RL It is approximately 7.178A, which means the system achieves constant current output.

[0044] like Figure 8 As shown, the voltage and current waveforms of the inverter output and the secondary-side rectifier bridge input of a magneto-electric integrated hybrid wireless power transmission system when the load is 20Ω. The circuit input voltage and current are in phase, achieving zero phase angle input.

[0045] It can be seen from the above embodiments that the output current of the magneto-electrically integrated hybrid wireless power transmission system proposed by the present invention does not change with the change of resistance, and can achieve constant output current. The circuit input voltage and current are in phase, the input impedance is purely resistive, and zero phase angle input is achieved.

[0046] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A magneto-electric integrated hybrid wireless power transmission system, characterized in that: High-frequency full-bridge inverter circuit, primary compensation circuit containing two inductors and one capacitor, capacitive coupler with two emitter plates and two receiving plates, secondary compensation circuit containing two inductors and one capacitor, rectifier circuit and load resistor R L , capacitor C in the primary compensation circuit f1 The inductor L1 is connected in series with the inverter circuit, and the inductor L2 and the inductor L P Connected in series at both ends of the emitter plate, the inductor L1 and the inductor L2 form a loosely coupled transformer under the mutual inductance M1; the capacitor C in the secondary compensation circuit f2 The inductor L4 is connected to the load resistor R L Phase connection, inductor L3 and inductor L S In series connection at both ends of the receiving plate, inductor L3 and inductor L4 form a loosely coupled transformer under mutual inductance M3; inductor L P As the transmitting coil and inductor L S As the receiving coil, it forms a magnetic coupling mechanism under the mutual inductance M2; the input voltage of the high-frequency inverter circuit is V dc , the effective value of the fundamental component of the output voltage of the high-frequency full-bridge inverter circuit is U1; in its equivalent circuit, the equivalent T model of the capacitive coupler includes the capacitor C A , capacitor C B and capacitor C C The equivalent model of the loosely coupled transformer T of inductance L1 and inductance L2 under mutual inductance M1 includes inductance L1-M1, inductance L2-M1 and inductance M1. The equivalent model of the loosely coupled transformer T of inductance L3 and inductance L4 under mutual inductance M3 includes inductance L3-M3, inductance L4-M3 and inductance M3. The transmitting coil L P and receiving coil L S The voltage source equivalent model of the magnetic coupling mechanism under the mutual inductance M2 includes the equivalent inductance L of the transmitting coil. P , the equivalent inductance L of the receiving coil S , the excitation voltage source U on the transmitting side M1 and the excitation voltage source U on the receiving side M2 , where U M1 =jω0M2I3,U M2 =jω0M2I2, the currents of the four loops are I1, I2, I3, and I4 respectively, the current direction is clockwise, ω0 is the resonant angular frequency of the system, and the resonant frequency is: The currents of the four loops are I1, I2, I3, and I4, respectively, and the current direction is clockwise. The transfer matrix of the equivalent circuit is: From (2), the system output current I4 is: The input impedance of the circuit is: Through the above parameter design, the output current of the circuit is constant and does not change with the change of resistance. The input impedance of the circuit is purely resistive, which ensures that the circuit input voltage and current are in phase and the power factor is 1.

2. The magneto-electric integrated hybrid wireless power transmission system according to claim 1, characterized in that: The coils and plates in the coupling mechanism are distributed in four planes, Plane1, Plane2, Plane3, and Plane4. The distances between Plane1, Plane2, and Plane3 are very small, and together they constitute the transmitting side. The DD-type coil in Plane1 is the transmitting side compensation network inductor L1, the outermost in Plane2 is the transmitting side plates P1 and P2, the inner DD-type coil is the transmitting side compensation network inductor L2, and the DD-type coil in Plane3 is the transmitting side transmitting coil L P Plane 4 is the receiving side, the outermost is the receiving side plates P3 and P4, and the inner side is the Q-type receiving side receiving coil L4, the Q-type receiving side compensation network inductor L3, the DD-type receiving side compensation network inductor L S ; Among them, coil L1 and coil L2 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, coil L2 and coil L1 are coupled to each other, and coil L3, coil L4, coil L P and coil L S Decoupled from each other, the mutual inductance is M1; coil L3 and coil L4 are coupled to each other, and coil L1, coil L2, and coil L P and coil L S Decoupled from each other, coil L4 and coil L3 are coupled to each other, and coil L1, coil L2, coil L P and coil L S Mutually decoupled, mutual inductance is M2; coil L P With coil L S Mutually coupled, and mutually decoupled from coils L1, L2, L3, and L4. S With coil L P They are coupled to each other and decoupled from each other with coils L1, L2, L3 and L4, and the mutual inductance is M3. Through the above structural design, the coupling mechanism eliminates unnecessary coupling between coils.

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