CN202975154U - Electromagnetic coupling resonance coil parameter measuring system - Google Patents

Abstract

The utility model is an electromagnetic coupling resonant coil parameter measurement system, which belongs to the category of wireless power transmission and conversion, can realize accurate parameter measurement of the key component in the wireless power transmission system—the resonant coil, and has broad application prospects. The device uses a signal generator to cooperate with a power amplifier to supply power to the transmitting coil, and establishes an electromagnetic coupling resonance system with the resonant coil, so that the receiving coil can obtain a corresponding response waveform, thereby accurately measuring the parameters of the resonant coil. It mainly includes: signal generator (1), on-off control switch (2), power amplifier (3), primary compensation network (4), transmitting coil (5), resonant coil (6), receiving coil (7), Oscilloscope(8). The utility model can measure the parameters of the resonant coil working at a frequency below 30MHz, so as to ensure the reliable progress of the wireless energy transmission process, and has the advantages of low cost and maintenance cost, easy operation, intelligent controllability, and the like.

Description

Electromagnetic Coupling Resonant Coil Parameter Measurement System

technical field

Wireless power transmission technology is currently one of the most active hot research directions in the field of electrical engineering. It is a frontier topic integrating basic research and applied research. The research field covers electromagnetic field, power electronics technology, power system, control technology, physics, materials science, information technology and many other technical fields. The wireless power supply method can effectively overcome various defects in the wire connection method and realize the free power supply of electronic appliances, which has important application expectations and broad development prospects. the

The present invention—electromagnetic coupling resonant coil parameter measurement system, is based on the principle of wireless power transmission technology, according to the relevant theory of electromagnetic coupling resonance, and through experimental methods, accurately measures the parameters of the resonant coil in the electromagnetic coupling resonant system, so that the resonant coil can be fully utilized electrical characteristics. This parameter measurement system can be widely used in the measurement environment of the resonant frequency and quality factor of the resonant coil working below 30MHz. the

Background technique

Wireless power transmission technology can be roughly divided into three types: the first is inductively coupled power transmission, which uses the principle of loosely coupled transformers for energy transmission, and the transmitter and receiver generally have an iron core device to reduce the loop reluctance. The second type is electromagnetic coupling resonant power transmission, which transmits energy through resonance between the inductor and the distributed capacitor on the resonator with high quality factor. The third is electromagnetic radiation power transmission. In this technology, power is converted into microwave form, and the transmission distance exceeds several kilometers, which can realize the long-distance transmission of power. Among them, the electromagnetic coupling resonance technology uses the near-field area of the non-radiative electromagnetic field to complete the power transmission. On the one hand, compared with the electromagnetic induction energy transfer, the transmission distance has been greatly expanded; on the other hand, compared with the electromagnetic radiation energy transfer, the near field Regional energy has the characteristics of non-radiation, and this technology has good safety, so it has received great attention and research at present. the

Contents of the invention

The technical problem to be solved by the present invention is to accurately measure the resonant frequency and quality factor of the resonant coil in the system in a non-contact manner under the guidance of the theory of electromagnetic coupling resonant wireless power transmission, so that multiple coils can be measured and calibration, to realize efficient, reliable and long-distance wireless transmission of electric energy. the

The technical scheme adopted in the present invention is: an electromagnetic coupling resonant coil parameter measurement system, including a signal generator (1) transmitting a signal to a power amplifier (3) under the control of an on-off control switch (2), and the power amplifier (3) The signal is converted into corresponding power and loaded on the transmitting coil (5) through the primary compensation network (4), and the transmitting coil (5) and the resonant coil (6) perform energy exchange in a wireless manner, and then the resonant coil (6) will The energy is transmitted to the receiving coil (7) in an inductive manner, and the waveform on the receiving coil (7) is monitored by an oscilloscope (8). the

The transmitting coil (5) adopts a low-loss red copper tube with a wire diameter of 6 mm and a thickness of 0.5 mm. The way of induction is passed to the next level. the

The resonant coil (6) is wound into a helical structure by a low-loss copper tube of any thickness and placed coaxially and concentrically with the transmitting coil (5). The number of turns, radius and turn spacing of the helical structure will directly affect the resonance The resonant frequency and quality factor of the coil are responsible for inducing high-frequency energy on the transmitting coil (5) and establishing a reactive near field. the

The receiving coil (7) is composed of low-loss multi-turns and wound Teflon silver-plated wire, and placed coaxially and concentrically with the resonant coil A2 (7), and a load (9) is connected to both ends of the output, and the number of turns determines The spatial position where the load coil works. the

The electromagnetic coupling resonant coil parameter measurement system of the present invention loads high-frequency electromagnetic power through the transmitting coil (5) and transmits it to the resonant coil (6) in an inductive manner, so that the resonant coil (6) forms a stable reactive power around it. In the near field, when the AC signal source changes the excitation frequency, there is only one frequency corresponding to the maximum gain point of the resonant coil (6), so the resonant frequency of this point can be measured through the receiving coil (7) and the resonant coil (6) can be accurately measured. The parameter calculation can realize the accurate measurement of the resonant coil parameters in the electromagnetic coupling resonant system. the

Description of drawings

Fig. 1 is an overall structural diagram of the present invention;

Fig. 2 is the structural diagram of transmitting coil (5);

Fig. 3 is the structural diagram of resonant coil (6);

Fig. 4 is the structural diagram of receiving coil (7);

Fig. 5 is a schematic diagram of the working principle of the electromagnetic coupling resonant coil parameter measurement system. the

in:

(1): Signal generator; (2): On-off control switch; (3): Power amplifier; (4): Primary compensation network; (5): Transmitting coil; (6): Resonant coil; (7): Receive coil; (8): Oscilloscope

1: transmitting coil; 2: resonant coil; 3: receiving coil; 4: AC power; 5: oscilloscope

Detailed ways

The electromagnetic coupling resonant coil parameter measurement system of the present invention will be described in detail below in combination with examples and accompanying drawings. the

As shown in Figure 1, the electromagnetic energy coupler of the wireless power transmission system of the present invention includes: a signal generator (1), an on-off control switch (2), a power amplifier (3), a primary compensation network (4), a transmitting Coil (5), resonant coil (6), receiving coil (7), oscilloscope (8). the

As shown in Figure 2, the transmitting coil (5) is realized by a single-turn low-loss copper tube with a certain thickness after the surface is silver-plated and anti-rust. In order to ensure the gain of the power signal within a certain frequency range, the primary The compensation network (4) works. When the signal generator (1) starts to work, the on-off control switch (2) cooperates with the power amplifier (3), and generates high-frequency electromagnetic energy according to the inductance of the transmitting coil (5). This energy will be directly loaded on the transmitting coil (5). the

As shown in Fig. 3, the resonant coil (6) is wound into a helical structure by a low-loss red copper tube with a certain thickness and placed coaxially with the transmitting coil (5). When the transmitting coil (5) works normally, electromagnetic energy is loaded onto the resonant coil (6) through the transmitting coil (5) according to the principle of electromagnetic induction, and a reactive near field is established by the resonant coil (6). At the same time, when there are other coils in the space around the resonant coil (6), electromagnetic energy will be obtained through the reactive near field according to the law of electromagnetic coupling resonance wireless energy transmission theory. the

As shown in Figure 4, the receiving coil (7) is composed of a silver-plated low-loss multi-turn Teflon coil, placed at a distance from the resonant coil (6), and an oscilloscope (8) is connected to the output ends. When the resonant coil (6) establishes a reactive near-field, the receiving coil (7) will obtain electromagnetic energy according to the principle of electromagnetic coupling resonance, and the frequency characteristics of this energy are directly related to the electrical parameters of the resonant coil (6), so that the oscilloscope ( 8) Measuring the output waveform of the receiving coil (7) to complete the measurement of the parameters of the resonant coil (6). the

As shown in Figure 5, the described electromagnetic coupling resonant coil parameter measurement system first loads high-frequency electromagnetic energy on the transmitting coil (5), and the energy is transferred to the resonant coil (6) in the form of induction and establishes a reactive near field, When the AC signal source changes the excitation frequency, there is only one frequency corresponding to the maximum gain point of the resonant coil (6), so the resonant frequency of this point can be measured through the receiving coil (7) and the parameters of the resonant coil (6) can be accurately calculated , to realize the accurate measurement of the resonant coil parameters in the electromagnetically coupled resonant system. the

The electromagnetic coupling resonant coil parameter measurement system of the present invention, according to the related theory of electromagnetic coupling resonance, accurately measures the electromagnetic coupling resonant wireless power transmission system through experimental methods, and provides guarantee for realizing efficient, reliable and long-distance wireless transmission of electric energy. Under normal working conditions, it can accurately measure the wireless power supply system within a few meters, and can be widely used in the measurement environment of the resonant frequency and quality factor of the resonant coil working below 30MHz. the

Claims (3)

1. Electromagnetic coupling resonant coil parameter measurement system, it is characterized in that comprising signal generator (1) under the control of on-off control switch (2) to power amplifier (3) transmission signal, power amplifier (3) converts this signal For the corresponding power is loaded on the transmitting coil (5) through the primary compensation network (4), the transmitting coil (5) and the resonant coil (6) perform energy exchange in a wireless manner, and then the resonant coil (6) transfers the energy in the form of induction The mode is transmitted to the receiving coil (7), and the waveform on the receiving coil (7) is monitored by an oscilloscope (8). the 2. The electromagnetic coupling resonant coil parameter measurement system according to claim 1, further characterized in that the transmitting coil (5) adopts a low-loss copper tube with a wire diameter of 6mm and a thickness of 0.5mm, and its surface is silver-plated Made into single-turn coils with circular cross-section after anti-rust treatment. the 3. The electromagnetic coupling resonant coil parameter measurement system according to claim 1, further characterized in that the resonant coil (6) is wound into a helical structure by a low-loss red copper tube and is coaxial with the transmitting coil (5) Concentric close to place. the

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