Wireless power transmission demonstration device based on magnetic coupling resonance

Abstract

The invention discloses a wireless electric energy transmission demonstration device based on magnetic coupling resonance. The wireless electric energy transmission demonstration device comprises a transmitting end inductance coil, a power amplifier, a transmitting end capacitor bank, a receiving end inductance coil, a receiving end capacitor bank, small lamp beads and a coil support. Wherein the transmitting end inductance coil is respectively connected with the power amplifier and the transmitting end capacitor bank; the receiving end inductance coil is respectively connected with the receiving end capacitor bank and the small lamp bead; the transmitting end inductance coil and the receiving end inductance coil are both fixed on the coil bracket, the coil bracket can change the coil distance through horizontal movement, can change the inclination angle of the coil through fixed-point rotation, and can change the opposite area of the coil through vertical lifting of the bracket height. The device provided by the invention can realize convenient effect observation of the transmission efficiency of the magnetic coupling resonance wireless power transmission mode.

Description

Technical Field

[0001] The invention relates to the technical field of wireless power transmission, and in particular to a wireless power transmission demonstration device based on magnetic coupling resonance. Background Art

[0002] Wireless Power Transfer (WPT) is a power supply mode that uses invisible soft media such as electric fields, magnetic fields, and microwaves to transfer electric energy from the power source to the power-consuming equipment. According to the principle of power transmission, wireless power transmission technology can be roughly divided into three categories: inductive coupling, microwave radiation, and magnetic coupling resonance.

[0003] Among them, the basic principle of magnetic coupling resonance is that efficient energy exchange can be achieved between two objects with the same resonant frequency, while the energy exchange between non-resonant objects is very weak. The transmission scale of magnetic coupling resonance is between the first two, and it is also called mid-range energy transmission technology. In addition to the larger transmission distance, magnetic coupling resonance also has the following advantages: due to the use of strong coupling resonance technology, higher power and efficiency can be achieved; the system uses magnetic field combination and non-radiation technology, making it harmless to the human body; it has good penetration and is not affected by non-metallic obstacles. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a wireless power transmission demonstration device based on magnetic coupling resonance, which can realize convenient effect observation of the transmission efficiency of the magnetic coupling resonance wireless power transmission method.

[0005] In a first aspect, an embodiment of the present invention provides a wireless power transmission demonstration device based on magnetic coupling resonance, characterized in that it includes:

[0006] Transmitter inductor coil, power amplifier, transmitter capacitor group, receiver inductor coil, receiver capacitor group, small lamp beads, coil bracket;

[0007] Among them, the transmitting end inductor coil is respectively connected to the power amplifier and the transmitting end capacitor group; the receiving end inductor coil is respectively connected to the receiving end capacitor group and the small lamp bead; the transmitting end inductor coil and the receiving end inductor coil are both fixed on the coil bracket, and the coil bracket can change the coil distance by horizontal movement, change the coil inclination by fixed-point rotation, and change the coil facing area by raising and lowering the bracket height.

[0008] Preferably, the transmitting end inductor coil is connected to the transmitting end capacitor group and the power amplifier respectively, including:

[0009] The transmitting end inductor is connected in series or in parallel with the transmitting end capacitor group through a wire, and the transmitting end inductor is connected in series with the output end of the power amplifier through a wire.

[0010] Preferably, the receiving end inductor coil is connected to the receiving end capacitor group and the small lamp bead respectively, including:

[0011] The receiving end inductor is connected in series or in parallel with the receiving end capacitor group through a wire, and the receiving end inductor is connected in series with the small lamp bead through a wire.

[0012] Preferably, the transmitting end capacitor group and the receiving end capacitor group are both composed of a plurality of polyester capacitors with fixed resistance values.

[0013] Preferably, it further comprises a plurality of testing devices, the testing devices comprising: a power amplifier output observation device, a first voltage observation device, and a second voltage observation device;

[0014] The power amplifier output observation device is connected to the power amplifier, and the first voltage observation device and the second voltage observation device are connected to the transmitting end inductor and the receiving end inductor respectively.

[0015] Preferably, it further comprises an external signal source, which is connected to the power amplifier and can generate a frequency-adjustable sinusoidal signal.

[0016] The beneficial effects of the present invention are as follows: it can realize convenient effect observation of the transmission efficiency of magnetically coupled resonant wireless power transmission technology under different transmission conditions and signal conditions. By changing the inductor coil and the signal frequency, the brightness of the small lamp beads and related testing equipment can be used to intuitively demonstrate the impact of different conditions on the transmission efficiency, which is helpful for convenient observation and research on magnetically coupled resonant wireless power transmission technology.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a wireless power transmission demonstration device based on magnetic coupling resonance provided by an embodiment of the present invention;

[0021] Figure 2 A circuit diagram of a wireless power transmission demonstration device based on magnetic coupling resonance provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a system model of a wireless power transmission demonstration device based on magnetic coupling resonance provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] To facilitate understanding of this embodiment, Figure 1 A wireless power transmission demonstration device based on magnetic coupling resonance disclosed in an embodiment of the present invention is introduced in detail.

[0025] Embodiment 1:

[0026] A wireless power transmission demonstration device based on magnetic coupling resonance includes: a transmitting end inductor coil, a power amplifier, a transmitting end capacitor group, a receiving end inductor coil, a receiving end capacitor group, a small lamp bead, and a coil bracket;

[0027] Among them, the transmitting end inductor coil is respectively connected to the power amplifier and the transmitting end capacitor group; the receiving end inductor coil is respectively connected to the receiving end capacitor group and the small lamp bead; the transmitting end inductor coil and the receiving end inductor coil are both fixed on the coil bracket, and the coil bracket can change the coil distance by horizontal movement, change the coil inclination by fixed-point rotation, and change the coil facing area by raising and lowering the bracket height.

[0028] Furthermore, the coil support is provided with a guide rail, and the guide rail is provided with a scale. The function of the guide rail is that in the actual test of the influence of the coil distance on the transmission effect, it is necessary to ensure that the central axis of the inductor coil remains coincident as much as possible, and the inductor coil is fixed on the guide rail for easy movement; the scale on the guide rail is convenient for quantitative analysis when changing the coil distance.

[0029] In this embodiment, the coil distance is the distance between the transmitting end inductor coil and the receiving end inductor coil, that is, the power transmission distance, the coil inclination angle is the inclination angle of the transmitting end inductor coil and the inclination angle of the receiving end inductor coil, and the coil facing area is the facing area between the transmitting end inductor coil and the receiving end inductor coil.

[0030] Preferably, the transmitting end inductor coil is connected to the transmitting end capacitor group and the power amplifier respectively, including:

[0031] The transmitting end inductor is connected in series or in parallel with the transmitting end capacitor group through a wire, and the transmitting end inductor is connected in series with the output end of the power amplifier through a wire.

[0032] Preferably, the receiving end inductor coil is connected to the receiving end capacitor group and the small lamp bead respectively, including:

[0033] The receiving end inductor coil is connected in series or in parallel with the receiving end capacitor group through a wire, and the receiving end inductor coil is connected in series with the small lamp bead through a wire.

[0034] Preferably, the transmitting end capacitor group and the receiving end capacitor group are both composed of a plurality of polyester capacitors with fixed resistance values ​​and a sliding switch.

[0035] Preferably, it also includes a plurality of testing devices, including but not limited to: a power amplifier output observation device, a first voltage observation device, and a second voltage observation device;

[0036] The power amplifier output observation device is connected to the power amplifier, and the first voltage observation device and the second voltage observation device are connected to the transmitting end inductor coil and the receiving end inductor coil respectively.

[0037] Among them, the power amplifier output observation device is used to observe the amplitude, frequency and waveform of the power amplifier output voltage, and the first voltage observation device and the second voltage observation device are used to observe the amplitude, frequency and waveform of the transmitting end inductor coil and the receiving end inductor coil respectively.

[0038] Preferably, it also includes an external signal source, which is connected to the power amplifier and can generate a frequency-adjustable sinusoidal signal.

[0039] In this embodiment, the external signal source is a DC regulated power supply capable of providing a voltage of ±12V; the peak-to-peak value of the sinusoidal signal is 10V.

[0040] Figure 2 This is a circuit diagram of a wireless power transmission demonstration device based on magnetic coupling resonance. Figure 2 In the circuit, U1 is an external signal source, R1 and R2 are the voltage sampling resistors of the transmitting inductor and the receiving inductor, respectively, and C1~C'1 and C2~C'2 are the capacitor groups of the transmitting circuit and the receiving circuit, respectively. The circuit is provided with VCC, GND, VEE, and multiple conductive test hooks and banana sockets. VCC, GND, and VEE are used to connect an external ±12~15VDC power supply to power the demonstration device. The test equipment can be connected to the wire through the test hook, and the banana socket is used to connect the transmitting inductor and the receiving inductor to the wire.

[0041] In this embodiment, the test equipment also includes an oscilloscope, a resistance voltage observation device, a spectrum analyzer, and a multimeter. The oscilloscope is connected to a passive probe and added to the test hook, and the spectrum analyzer is connected to a near-field probe and is handheld and placed near the central axis of the transmitting / receiving coil.

[0042] Figure 3 Based on Figure 2 The demonstration device shown is a model of a magnetically coupled resonant wireless power transfer system built in a series resonant topology. Figure 3 In the example, U1 is an external signal source, R L is the load, R1 and R2 are the resistance of the inductor coil of the transmitting end circuit and the resistance of the inductor coil of the receiving end circuit respectively, C1 and C2 are the capacitor group of the transmitting end circuit and the capacitor group of the receiving end circuit respectively, L1 and L2 are the inductor of the transmitting end circuit and the inductor of the receiving end circuit respectively, M is the mutual inductance between the transmitting end inductor coil and the receiving end inductor coil, and d is the power transmission distance between the transmitting end inductor coil and the receiving end inductor coil.

[0043] Combination Figure 2 , the maximum transmission power of the transmitting inductor and the receiving inductor is analyzed. In the series resonance state, the circuit is purely resistive, and the inductor voltage U L and the voltage U across the resonant capacitor C The sum is zero, that is, U L +U C = 0. At this time, the impedance is minimum and the current is maximum, and the voltage across the inductor and capacitor may be much greater than the power supply voltage.

[0044] Furthermore, the operating frequency of the transmission system is When the transmission system reaches the resonant state, the natural resonant angular frequency of the transmitting end inductor and the receiving end inductor is Therefore, according to the circuit principle, the loop equations of the transmitter circuit and the receiver circuit can be obtained:

[0045]

[0046] From circuit theory, we know that when the transmitter circuit and the receiver circuit satisfy equation (1.2), series resonance occurs. Equation (1.2) is:

[0047]

[0048] Introducing reflected impedance That is, the loop impedance of the receiving end inductor is reflected to the equivalent impedance of the transmitting coil through mutual inductance. Under the resonant state, the following expression can be obtained by rearranging equation (1.1):

[0049]

[0050] Load R L The expression for the average power is:

[0051]

[0052]

[0053] Input Power:

[0054]

[0055] Transmission efficiency:

[0056]

[0057] In the system, the coupling degree of the two inductor coils is defined as the coupling factor k, which is expressed as:

[0058]

[0059] The size of the coupling factor k is related to the structure, relative position, distance, angle and surrounding magnetic medium of the two inductors, and its value is always less than 1. In the absence of a magnetic core, changing or adjusting the relative position of the two inductors will change the size of the coupling factor, and will also affect the transmission efficiency of the entire transmission system.

[0060] The working principle of the demonstration device provided in this embodiment is as follows:

[0061] The external signal source generates a sinusoidal signal, which is transmitted outward through the transmitting end inductor coil after passing through the power amplifier, and the receiving end inductor coil transmits electric energy by receiving the sinusoidal signal.

[0062] When the demonstration device is working, by changing the coil spacing, it can demonstrate the influence of transmission distance on the power transmission effect;

[0063] By changing the capacitance of the capacitor group, the effect of the inherent resonant frequency deviation of the transmitting end inductor and the receiving end inductor on the power transmission effect can be demonstrated;

[0064] By changing the frequency of the sinusoidal signal, it is possible to demonstrate the effect of the deviation between the signal frequency and the natural frequency of the inductor on the power transmission effect;

[0065] By changing the area facing the coil, the effect of the area facing the coil on the power transmission effect can be demonstrated;

[0066] By changing the connection mode between the transmitting end capacitor group and the receiving end capacitor group and the inductor coil, the influence of different circuit topologies on the power transmission effect can be demonstrated;

[0067] By changing the capacitance values ​​of the transmitting end capacitor group and the receiving end capacitor group, the influence of different capacitances on the power transmission effect can be demonstrated.

[0068] The brightness of the small light bead can intuitively display the resonance of the demonstration device during operation. The brighter the small light bead, the greater the power of the receiving end inductor coil and the higher the transmission efficiency; the darker the small light bead, the smaller the power of the receiving end inductor coil and the lower the transmission efficiency.

[0069] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A wireless power transmission demonstration device based on magnetic coupling resonance, characterized in that: include: Transmitter inductor coil, power amplifier, transmitter capacitor group, receiver inductor coil, receiver capacitor group, small lamp beads, coil bracket; Among them, the transmitting end inductor coil is respectively connected to the power amplifier and the transmitting end capacitor group; the receiving end inductor coil is respectively connected to the receiving end capacitor group and the small lamp bead; the transmitting end inductor coil and the receiving end inductor coil are both fixed on the coil bracket, and the coil bracket can change the coil distance by horizontal movement, change the coil inclination by fixed-point rotation, and change the coil facing area by raising and lowering the bracket height.

2. A wireless power transmission demonstration device based on magnetic coupling resonance according to claim 1, characterized in that: The transmitting end inductor coil is connected to the transmitting end capacitor group and the power amplifier respectively, including: The transmitting end inductor is connected in series or in parallel with the transmitting end capacitor group through a wire, and the transmitting end inductor is connected in series with the output end of the power amplifier through a wire.

3. A wireless power transmission demonstration device based on magnetic coupling resonance according to claim 1, characterized in that: The receiving end inductor coil is connected to the receiving end capacitor group and the small lamp bead respectively, including: The receiving end inductor is connected in series or in parallel with the receiving end capacitor group through a wire, and the receiving end inductor is connected in series with the small lamp bead through a wire.

4. A wireless power transmission demonstration device based on magnetic coupling resonance according to claim 1, characterized in that: The transmitting end capacitor group and the receiving end capacitor group are both composed of a plurality of polyester capacitors with fixed resistance values.

5. The wireless power transmission demonstration device based on magnetic coupling resonance according to claim 1 is characterized in that: Also included are a plurality of test devices, the test devices including: a power amplifier output observation device, a first voltage observation device, and a second voltage observation device; The power amplifier output observation device is connected to the power amplifier, and the first voltage observation device and the second voltage observation device are connected to the transmitting end inductor and the receiving end inductor respectively.

6. A wireless power transmission demonstration device based on magnetic coupling resonance according to claim 1, characterized in that: It also includes an external signal source, which is connected to the power amplifier and can generate a frequency-adjustable sinusoidal signal.

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