CN107707032B - Parallel-parallel wireless power transmission system based on negative resistance - Google Patents
Parallel-parallel wireless power transmission system based on negative resistance Download PDFInfo
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- CN107707032B CN107707032B CN201710934499.7A CN201710934499A CN107707032B CN 107707032 B CN107707032 B CN 107707032B CN 201710934499 A CN201710934499 A CN 201710934499A CN 107707032 B CN107707032 B CN 107707032B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 4
- 239000010752 BS 2869 Class D Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000010753 BS 2869 Class E Substances 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
Abstract
The invention discloses a parallel-parallel wireless power transmission system based on negative resistance, which comprises a negative resistance and a transmitting circuit which are connected, and a receiving circuit and a load which are connected; the transmitting circuit comprises a primary capacitor and a primary transmitting coil which are connected in parallel, and the primary transmitting coil comprises a primary inductor and a transmitting circuit internal resistance which are connected in series; the receiving circuit comprises a secondary receiving coil and a secondary capacitor which are connected in parallel, wherein the secondary receiving coil comprises a secondary inductor and a receiving circuit internal resistance which are connected in series. According to the invention, the negative resistance is connected with the transmitting circuit, and the energy supply to the circuit is realized by utilizing the property of energy generated by the negative resistance, so that the high-frequency inversion source in the traditional parallel-parallel wireless power transmission system is replaced, the structure of the system is simpler, the working frequency is higher, and the transmission efficiency is more stable.
Description
Technical Field
The invention relates to the field of wireless power transmission or wireless power transmission technology, in particular to a parallel-parallel wireless power transmission system based on negative resistance.
Background
The wireless power transmission technology can realize complete electrical isolation between the power supply and the electric equipment, and has the advantages of safety, reliability and flexibility. As early as the end of the 19 th century, nikola Tesla (Nikola Tesla) utilized the principle of wireless power transfer to illuminate a bulb without any wire connection. Wireless power transmission based on magnetic coupling resonance is a breakthrough progress made by students in the field of wireless power transmission by MIT, and since 2007 is published, very great reverberation is caused in the field of wireless power transmission, more and more students are added to basic research and application development of wireless power transmission technology.
In the current resonant wireless power transmission system, the realization of a high-frequency, high-reliability and high-power supply is always an important difficult problem of applying the technology to the transmission of high-power loads. Conventional wireless power transmission systems are generally composed of a driving source, a transmitting circuit, a receiving circuit, and a load, wherein the driving source determines system parameters and is the most important part in wireless power transmission as a converting and controlling part of a system power supply. In order to meet the development trend of high frequency and high efficiency of the wireless power transmission system, a switch type driving source (power amplifier) such as a class-D power amplifier and a class-E power amplifier is generally adopted, and the theoretical efficiency of the class-D power amplifier reaches 100%, but the output power is lower, so that the power amplifier is only suitable for low-power application occasions. At present, bridge type inverters formed by IGBT and MOSFET are mostly adopted in high-power application occasions, and meanwhile, wireless transmission of electric energy is realized by matching different soft switching algorithms, but the working frequency is low, and the transmission distance is short. Therefore, under the existing technical conditions, it is quite difficult to realize a high-frequency (MHz or more), high-reliability and high-power switching converter due to the restriction of factors such as power switching transistors and circuit topology structures.
Negative resistance is an active component that satisfies ohm's law and the series-parallel rule. In contrast to the resistor, the phase difference between the voltage and the current fundamental wave of the negative resistance is pi, and the power in the circuit is negative, namely, the electric energy is released to the circuit. Negative resistance has a variety of implementations, such as being constructed with positive resistance and op-amps. In the past, negative resistance has been used to raise the input impedance of an inverting amplifier, neutralize the positive resistance of an LC tank, etc., and have rarely been used as a power source to power a circuit. Compared with a high-frequency inverter, the negative resistance has the advantages of simple system structure, no need of using MOSFET, high working frequency and the like, so that the problem that the conventional high-frequency inverter cannot be further increased in frequency can be solved. And the operating frequency of the system is determined by the values of the components in the circuit. At an operating frequency, the transmission efficiency of the system can be maintained at a very high level and remains substantially constant over a long range with distance changes, achieving stable transmission of radio energy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a parallel-parallel wireless power transmission system based on negative resistance, which realizes the energy supply to a circuit by utilizing the property of energy generated by negative resistance, thereby replacing a high-frequency inversion source in the traditional parallel-parallel wireless power transmission system, and leading the system to have simpler structure, higher working frequency and more stable transmission efficiency.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the parallel-parallel wireless power transmission system based on the negative resistance comprises a negative resistance and a transmitting circuit which are connected, and a receiving circuit and a load which are connected, wherein the transmitting circuit and the receiving circuit realize wireless transmission of power in an electromagnetic induction coupling mode; the transmitting circuit comprises a primary capacitor and a primary transmitting coil which are connected in parallel, the primary transmitting coil comprises a primary inductor and a transmitting circuit internal resistance which are connected in series, and the transmitting circuit internal resistance refers to all positive resistors of the transmitting circuit except for a resistor of a secondary side reflected to the primary side; the receiving circuit comprises a secondary receiving coil and a secondary capacitor which are connected in parallel, wherein the secondary receiving coil comprises a secondary inductor and a receiving circuit internal resistance which are connected in series, and the receiving circuit internal resistance refers to all positive resistances of the receiving circuit except a load.
The voltage and current relationship of the negative resistance satisfies the following conditions: v R ＝-Ri R The phase relationship satisfies:wherein i is R For the fundamental wave of current flowing through the negative resistance, v R Is the voltage fundamental wave at two ends of the negative resistance, R is the resistance value of the negative resistance, < >>V is R And i R A phase difference between them; the power of the negative resistance satisfies: />Where P is the power of the negative resistance, -indicating that the negative resistance discharges energy outwards.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the system has simple structure and various negative resistance construction modes.
2. The negative resistance is utilized to replace a high-frequency power source of the parallel-parallel wireless power transmission system, so that the technical problem that the current high-frequency and high-power switch converter is difficult to realize can be effectively solved.
3. The system operating frequency is determined by the component values in the circuit. At the working frequency, the system can keep high efficiency, and stable wireless power transmission is realized.
Drawings
Fig. 1 is a circuit diagram of a system provided in an embodiment.
Fig. 2 is a waveform diagram of the voltage and current of the negative resistance in the embodiment.
Fig. 3 is a graph showing a relationship between transmission efficiency and transmission distance in the embodiment.
Detailed Description
The invention will be further illustrated with reference to specific examples.
The basic principle of the parallel-parallel wireless power transmission system based on the negative resistance provided by the embodiment is that the negative resistance is utilized to release energy and provide electric energy outwards, so that the parallel-parallel wireless power transmission system is used for replacing a high-frequency power source in the traditional parallel-parallel wireless power transmission system, and the technical problem that the conventional high-frequency and high-power switch converter is difficult to realize is effectively solved.
As shown in FIG. 1, the system comprises a negative resistance-R and a transmitting circuit connected with each other and a receiving circuit and a load R connected with each other L The transmitting circuit and the receiving circuit realize wireless transmission of electric energy in an electromagnetic induction coupling mode; the transmitting circuit comprises a primary side capacitor C connected in parallel 1 And a primary-side transmitting coil including a primary-side inductance L connected in series 1 And internal resistance R of transmitting circuit S1 The internal resistance R of the transmitting circuit S1 All positive resistors of the transmitting circuit except the resistor from the secondary side to the primary side; the receiving circuit comprises a secondary receiving coil and a secondary capacitor C which are connected in parallel 2 The secondary side receiving coil comprises a secondary side inductance L connected in series 2 And internal resistance R of receiving circuit S2 The internal resistance R of the receiving circuit S2 Refers to all positive resistances of the receiving circuit except the load.
For the convenience of analysis, make the internal resistance R of the transmitting circuit S1 And internal resistance R of receiving circuit S2 The parameters are consistent and are R S The method comprises the steps of carrying out a first treatment on the surface of the Let the primary side capacitor C 1 And secondary side capacitance C 2 The parameters are consistent with C; let primary inductance L 1 And secondary inductance L 2 The parameters are consistent with L.
The coupling mode of the system is as follows:
in the method, in the process of the invention,for the natural frequency of the transmitting coil and the receiving coil, < >>For the internal resistance loss factor of the transmitting circuit and the receiving circuit, < >>Is a negative resistance gain coefficient +>Is the inverse of the negative resistance>As a result of the load factor,is the inverse of the load resistance>For the coupling coefficient between the transmitting circuit and the receiving circuit, < >>And M is the mutual inductance between the primary side inductance and the secondary side inductance, and is the mutual inductance coupling coefficient between the transmitting coil and the receiving coil.
The eigenfrequencies of the system available are:
when gamma is 1 ＝2τ 0 +τ L When the power provided by the negative resistor connected with the transmitting circuit to the circuit is completely absorbed by the internal resistance of the transmitting circuit, the internal resistance of the receiving circuit and the load.
Assuming that the initial energy of the system is stored in mode a 1 In let a 1 (0)＝1，a 2 (0) =0, pattern a is obtained 1 And a 2 The expression of (2) is:
then:
the transmission efficiency of the system is as follows:
from the above equation, if the electric energy provided by the negative resistance is absorbed completely by the internal resistance of the transmitting circuit, the internal resistance of the receiving circuit and the load, i.e., gamma 1 ＝2τ 0 +τ L When the system works at kappa is more than or equal to tau 0 +τ L In the region, the working frequency isTransmission efficiency is maintained->Constant, when the system works at kappa < tau 0 +τ L In the region, the working frequency is omega=omega 0 The transmission efficiency varies with the coupling coefficient between the transmitting circuit and the receiving circuit, and is +.>
Let the natural frequency of the transmitting coil and the receiving coil be f 0 The primary side inductance and the secondary side inductance are respectively L=10muH, the primary side capacitance and the secondary side capacitance are respectively C=0.633 nF, and the internal resistance of the transmitting circuit and the internal resistance of the receiving circuit are respectively R S =0.5Ω, load resistance R L ＝2000Ω。
The voltage fundamental wave and current fundamental wave relation of the negative resistance meets the following conditions: v R ＝-Ri R The phase relationship satisfies:output power is satisfied->Taking the mutual inductance coupling coefficient k=0.1 as an example, fig. 2 shows that the phase difference between the voltage fundamental wave and the current fundamental wave of the negative resistance is pi, that is, the electric energy is released outwards.
The relationship between the transmission efficiency and the transmission distance of the system obtained by the equation (6) is shown as a solid line in fig. 3, and the solid points are the transmission efficiencies at different transmission distances obtained by the PSIM circuit simulation, so that the theoretical analysis and the simulation result are consistent. The electric energy provided in satisfying the negative resistance is completely absorbed by the internal resistance of the transmitting circuit, the internal resistance of the receiving circuit and the load, namely in gamma 1 ＝2τ 0 +τ L Under the condition that when the system works at kappa is larger than or equal to tau 0 +τ L Within the region, transmission efficiency is maintainedConstant, when the system works at kappa < tau 0 +τ L In the region, the transmission efficiency changes along with the coupling coefficient between the transmitting circuit and the receiving circuit, which is
According to the analysis, the parallel-parallel wireless electric energy transmission system based on the negative resistance has the property of releasing power, provides electric energy for a circuit, effectively replaces the function of a high-frequency power source, ensures that the system is simpler in structure, keeps the transmission efficiency basically constant within a certain range, is beneficial to application in more occasions, and is obvious in advantage and worth popularizing.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (1)
1. The parallel-parallel wireless power transmission system based on negative resistance is characterized in that: the device comprises a negative resistor, a transmitting circuit, a receiving circuit and a load, wherein the negative resistor and the transmitting circuit are connected, and the receiving circuit and the load are connected; the transmitting circuit comprises a primary capacitor and a primary transmitting coil which are connected in parallel, the primary transmitting coil comprises a primary inductor and a transmitting circuit internal resistance which are connected in series, and the transmitting circuit internal resistance refers to all positive resistors of the transmitting circuit except for a resistor of a secondary side reflected to the primary side; the receiving circuit comprises a secondary receiving coil and a secondary capacitor which are connected in parallel, wherein the secondary receiving coil comprises a secondary inductor and a receiving circuit internal resistance which are connected in series, and the receiving circuit internal resistance refers to all positive resistances of the receiving circuit except a load;
the voltage and current relationship of the negative resistance satisfies the following conditions: v R ＝-Ri R The phase relationship satisfies:wherein i is R For the fundamental wave of current flowing through the negative resistance, v R Is the voltage fundamental wave at two ends of the negative resistance, R is the resistance value of the negative resistance, < >>V is R And i R A phase difference between them; the power of the negative resistance satisfies:/>wherein P is the power of the negative resistance, -indicating that the negative resistance is discharging energy outwards;
make the internal resistance R of the transmitting circuit S1 And internal resistance R of receiving circuit S2 The parameters are consistent and are R S The method comprises the steps of carrying out a first treatment on the surface of the Let the primary side capacitor C 1 And secondary side capacitance C 2 The parameters are consistent with C; let primary inductance L 1 And secondary inductance L 2 The parameters are consistent with L;
the eigenfrequency of the system is:
in the method, in the process of the invention,for the natural frequency of the transmitting coil and the receiving coil, < >>For the internal resistance loss factor of the transmitting circuit and the receiving circuit, < >>Is a negative resistance gain coefficient +>Is the inverse of the negative resistance>For the load factor->For the load R L Inverse of resistance>For transmitting circuit andcoupling coefficient between receiving circuits, < >>M is the mutual inductance between the primary side inductance and the secondary side inductance, which is the mutual inductance coupling coefficient between the transmitting coil and the receiving coil;
if the electric energy provided by the negative resistance is completely absorbed by the internal resistance of the transmitting circuit, the internal resistance of the receiving circuit and the load, namely gamma 1 ＝2τ 0 +τ L When the system works at kappa is more than or equal to tau 0 +τ L In the region, the working frequency isTransmission efficiency is maintained->Constant, when the system works at kappa < tau 0 +τ L In the region, the working frequency is omega=omega 0 The transmission efficiency varies with the coupling coefficient between the transmitting circuit and the receiving circuit, and is +.>
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