CN110649715A - Multi-frequency many-to-one wireless power supply system based on PT (potential Transformer) symmetry principle - Google Patents
Multi-frequency many-to-one wireless power supply system based on PT (potential Transformer) symmetry principle Download PDFInfo
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Abstract
The invention discloses a multi-frequency many-to-one wireless power supply system based on a PT (potential transformer) symmetry principle, which comprises a transmitting device and a receiving device, wherein the transmitting device is connected with the receiving device through a power line; the transmitting device comprises 1 negative resistor and n transmitting modules, and the receiving device comprises n receiving modules and 1 load; the n transmitting modules are connected with the negative resistor in parallel, and each transmitting module consists of a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series; the n receiving modules are connected with the load in parallel, and each receiving module consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series. The invention is based on PT symmetrical principle, adopts multi-frequency transmission, solves the problem of instability caused by cross coupling between the transmitting coil and the receiving coil, realizes that the load always keeps constant output power and transmission efficiency when moving between the transmitting modules, effectively improves the anti-offset capability of the system, and simultaneously the transmitting modules have no-load self-protection characteristic.
Description
Technical Field
The invention relates to the technical field of wireless power transmission or wireless power transmission, in particular to a multi-frequency many-to-one wireless power supply system based on a PT (potential transformer) symmetry principle.
Background
In the prior art, Wireless Power Transfer (WPT) technology has the advantages of flexibility, convenience, safety, reliability, etc. compared with the traditional wire Power supply mode without electrical connection. The existing wireless power transmission technology is mainly based on the electromagnetic induction and magnetic resonance principle, and part of research results are applied to the fields of electronic consumer products, implantable medical equipment, electric vehicle charging and the like. However, in the existing magnetic coupling-based wireless power supply system, the transmitting coil and the receiving coil need to be aligned during operation, once deviation occurs, the transmission efficiency and the output power of the system are both reduced rapidly, and the user experience is greatly reduced.
In recent years, researchers apply the astronomical scale-time (PT) symmetric quantum theory to the field of wireless power transmission, which shows great advantages and realizes constant output power and transmission efficiency, but the traditional PT symmetric principle-based single transmitting coil wireless power supply system can only work in a PT symmetric region, the anti-offset capability is still limited, and the adoption of multiple transmitting coils is beneficial to expanding the PT symmetric region and further enhancing the anti-offset capability of the system, but the cross coupling between a no-load coil and a coil is a problem to be solved urgently for the multiple transmitting coil system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-frequency many-to-one wireless power supply system based on a PT (potential transformer) symmetry principle, on one hand, the PT symmetry principle is adopted to realize constant transmission efficiency and output power, on the other hand, multi-frequency transmission is adopted, the problem of cross coupling between no-load and coils in a multi-transmitting coil system is solved, the stability and the anti-offset capability of the system are effectively improved, and meanwhile, a transmitting module has the no-load self-protection characteristic and has remarkable advantages in practical application.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a multi-frequency many-to-one wireless power supply system based on PT symmetrical principle comprises a transmitting device and a receiving device; the transmitting device comprises 1 negative resistor and n transmitting modules, the receiving device comprises n receiving modules and 1 load, wherein n is a natural number greater than or equal to 2; the n transmitting modules are connected with the negative resistor in parallel, each transmitting module consists of a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series, and the transmitting coils of the n transmitting modules are in a decoupling or weak coupling state; the n receiving modules are connected with the load in parallel, each receiving module consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series, and the receiving coils of the n receiving modules are in a decoupling or weak coupling state.
Further, the natural frequencies of the n transmitting modules are different from each other, while the natural frequency of the ith transmitting module is the same as the natural frequency of the ith receiving module, i is 1,2,3 … n, that is to say, the following conditions are satisfied:
ωt1＝ωr1≠ωt2＝ωr2≠…ωtn＝ωrn
wherein the natural frequency of the i-th transmitting module is represented as
The natural frequency of the i-th receiving module is expressed as
LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriIs the ith receiving end resonance capacitance value.
Further, the negative resistor consists of an alternating current controlled voltage source and a control module which are connected; the control module comprises a drive control signal generation module, a drive control signal switching module and a switch drive module which are sequentially connected; the driving control signal generating module comprises n current sampling modules and n phase control modules and is used for generating n paths of driving control signals, wherein the ith path of driving control signals is generated by the ith current sampling module and the ith phase control module, i is 1,2 and 3 … n, the input end of the ith current sampling module is connected with the ith transmitting module, the output end of the ith current sampling module is connected with the input end of the ith phase control module, the ith current sampling module samples loop current of the ith transmitting module and generates the ith path of driving control signals through the ith phase control module, and the ith path of driving control signals are square waves which are completely opposite in phase or in phase with the loop current of the ith transmitting module; the output ends of the n phase control modules are connected and then connected with the input end of the drive control signal switching module, each path of drive control signal is input to the drive control signal switching module, the drive control signal switching module only outputs one path of drive control signal to the switch drive module at the same time, wherein, the drive control signal which is in the same direction or opposite direction with the loop current of the jth transmitting module is selected according to the load position, j is 1,2,3 … n, the coupling degree between the jth transmitting module and the jth receiving module is the maximum compared with the coupling degree between the transmitting module and the receiving module with the same inherent frequency under the current load position, and the jth transmitting module and the jth receiving module need to meet the space scale-time symmetry condition:
in the formula (I), the compound is shown in the specification,
the natural frequency of the jth transmit module is indicated,
denotes the natural frequency, R, of the jth receiving moduletj、RrjEquivalent internal resistance values of jth transmitting and receiving coils, -RNIs the value of a negative resistance, -RLThe value of the load is such that,
for the coupling coefficient between the jth transmitting coil and the jth receiving coil, MtjrjIs the mutual inductance value between the jth transmitting coil and the jth receiving coil, LtjIs the inductance value of the jth transmitting coil, LrjThe inductance value of the jth receiving coil; the switch driving module generates a driving signal of the switching device to an alternating current controlled voltage source.
Further, the voltage and current relationship of the negative resistance satisfies the following conditions: vti＝-RNItiThe phase relation satisfies:
wherein, ItiFor the current flowing through the negative resistance, VtiIs the voltage across the negative resistance, -RNIs the resistance value of the negative resistance and is automatically adjustable.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. constant output power and transmission efficiency are provided for the load in a large range, and the anti-offset capability of the wireless power supply system based on the PT symmetry principle is effectively improved.
2. The problem of cross coupling between the no-load coil and the coil of a multi-transmitting coil system is solved.
Drawings
Fig. 1 is a block diagram of a multi-frequency many-to-one wireless power supply system based on PT symmetry principle.
Fig. 2 is an equivalent schematic diagram of a multi-frequency many-to-one wireless power supply system based on PT symmetry principle.
Fig. 3 is a schematic diagram of two completely decoupled transmit coils in an embodiment.
Fig. 4 is a schematic diagram of two completely decoupled receiver coils in an embodiment.
Fig. 5 is a waveform of a loop current of each transmitting module and each receiving module when a load is above a first transmitting coil in the embodiment.
Fig. 6 is a waveform of a loop current of each transmitting module and each receiving module when a load is between a first transmitting coil and a second transmitting coil in the embodiment.
Fig. 7 shows the loop current waveforms of the transmitter modules and the receiver modules when the load is above the second transmitter coil according to the embodiment.
Detailed Description
To further illustrate the content and features of the present invention, the following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the invention is not limited thereto.
As shown in fig. 1, the multi-frequency many-to-one wireless power supply system based on PT symmetry principle provided by this embodiment includes a transmitting device and a receiving device; the above-mentionedThe transmitting device comprises 1 negative resistor 101 and n transmitting modules 102, and the receiving device comprises n receiving modules 103 and 1 load RLWherein n is a natural number greater than or equal to 2; n transmitting modules 102 are connected in parallel with the negative resistance 101, each transmitting module 102 being formed by a transmitting coil L connected in seriestiA transmitting end resonant capacitor CtiAnd equivalent internal resistance R of transmitting coiltiTransmitting coils L of n transmitting modules 102 (i ═ 1,2,3 … n)tiAre in a decoupling or weak coupling state with each other; n receiving modules 103 and a load RLConnected in parallel, each receiving module 103 being formed by a receiving coil L connected in seriesriReceiving end resonant capacitor CriEquivalent inner R with receiving coilriImpedance group (i ═ 1,2,3 … n), n receiving coils L of receiving module 103riAre decoupled or weakly coupled to each other.
The negative resistor 101 comprises an alternating current controlled voltage source 101-1 and a control module 101-2 which are connected, wherein the control module 101-2 comprises a drive control signal generation module 101-21, a drive control signal switching module 101-22 and a switch drive module 101-23 which are connected in sequence, the drive control signal generation module 101-21 comprises n current sampling modules 101-211 and n phase control modules 101-212 to generate n paths of drive control signals, wherein the i path of drive control signal is generated by the i current sampling module 101-211 and the i phase control module 101-212, the input end of the i current sampling module 101-211 is connected with the i emission module 102, the output end of the i current sampling module 101-211 is connected with the input end of the i phase control module 101-212, specifically, the ith current sampling module 101-; the output ends of the n phase control modules 101-212 are connected and then connected with the input ends of the drive control signal switching modules 101-22, and each drive control signal is input into the drive control signal switching modules 101-22; the driving control signal switching module 101-22 only outputs one driving control signal to the switch driving module 101-23 at the same time, and the switch driving module 101-23 generates a driving signal of a switching device to the alternating current controlled voltage source 101-1.
The natural frequency of the ith transmitting module is set to be the same as the natural frequency of the ith receiving module, and the natural frequencies of the n transmitting modules are different from each other. At this time, the coupling between the ith transmit coil and the jth receive coil has a negligible effect on the system, where i ≠ 1,2,3 … n, j ═ 1,2,3 … n, and i ≠ j. Therefore, the ith transmitting module and the ith receiving module can stably work independently of other coils, and fig. 2 is an equivalent circuit diagram of the working of the ith transmitting module and the ith receiving module, which can be obtained from kirchhoff's law according to fig. 2:
in the formula (1), -RNIs a negative resistance value, RLIs the load resistance value; omega is the working frequency of the system,
indicates the natural frequency of the ith transmitting module,denotes the natural frequency, L, of the i-th receiving moduletiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriIs the ith receiving end resonance capacitance value, Rti、RriRespectively the equivalent internal resistance values of the ith transmitting coil and the ith receiving coil,loop current vectors of the ith transmitting module and the ith receiving module respectively,
for the coupling coefficient between the i-th transmitting coil and the i-th receiving coil, MtiriIs as followsThe mutual inductance value between the i transmitting coils and the i receiving coils.
The condition for non-zero solution of formula (1) is:
the real-imaginary part separation of equation (2) can be obtained:
when the i-th transmitting module and the i-th receiving module form an astronomical-time symmetric circuit, i.e.
Equation (3) can be simplified as:
from the above equation, the frequency solution can be:
the condition that a purely real solution of frequency exists can be further derived from equation (6):
therefore, the following conditions are also required to be met during the steady-state operation of the system:
at this time, the ith transmitter module current effective value I can be obtained from the formulas (1) and (4)tiWith the current effective value I of the ith receiving moduleriThe ratio of the components is as follows:
the transmission efficiency η of the system at this time is equal to:
output power P of the systemoEqual to:
in the formula Vin，VoRespectively, the voltage across the negative resistance and the load resistance.
To further illustrate the advantages of the present invention, in the present embodiment, a dual-band dual-pair wireless power transmission system based on PT symmetry principle is designed.
The electrical parameters of the system are as follows: first transmitting coil inductance Lt1100 muH, second transmitting coil inductance Lt2100 muh, first receiver coil inductance Lr1100 muh, second receiver coil inductance Lr2100 muH, natural frequency ωt1＝ωr1＝355kHz,ωt2＝ωr2Equivalent internal resistance R at 177kHzt1＝Rt2＝Rr1＝Rr2Neglecting the coupling between the transmitting coils and between the receiving coils, the negative resistance is realized by the power electronic circuit, 0.1 Ω.
Optionally, in this example, the transmitting coil structure is as shown in fig. 3, and is a mutually decoupled transmitting coil structure, and is implemented by arranging DD-type coils and rectangular coils with the same size side by side, specifically, the first transmitting coil is a DD-type coil, and the second transmitting coil is a rectangular coil, but the transmitting coils are not limited to the above structure.
Optionally, in this example, the receive coil structure is as shown in fig. 4, and is a mutually decoupled receive coil structure, which is implemented by stacking DD-type coils and rectangular coils of the same size, specifically, the first receive coil is a DD-type coil, and the second receive coil is a rectangular coil, so that on one hand, decoupling between the receive coils is implemented, and on the other hand, the installation space is saved, but the receive coils are not limited to the above structure.
Preferably, in this example, the transmitting coils are arranged side by side horizontally, and the receiving coil moves horizontally right above the transmitting coils, so that decoupling between the transmitting coils and the receiving coils of different types is realized, and specifically, decoupling between the rectangular receiving coil and the DD type transmitting coil and decoupling between the DD type receiving coil and the rectangular transmitting coil are realized.
FIG. 5, FIG. 6, FIG. 7 show the load RLWhen the load is at different positions, the waveforms of the loop currents of the transmitting modules and the receiving modules are obtained through simulation, and it can be seen from the figure that when the load moves above the two transmitting modules, the output power and the transmission efficiency of the load are basically unchanged, the influence of the coupling coefficient change and the cross coupling between the transmitting coil and the receiving coil is avoided, the constant power can be stably and efficiently provided for the load in a large range, and the system has no-load self-protection characteristics.
The above embodiments are only preferred embodiments of the present invention, and the present invention provides a multi-frequency many-to-one wireless power supply system based on PT symmetry principle, and the present invention and its embodiments should not be limited thereto, so that the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. A multi-frequency many-to-one wireless power supply system based on PT symmetrical principle is characterized in that: comprises a transmitting device and a receiving device; the transmitting device comprises 1 negative resistor and n transmitting modules, the receiving device comprises n receiving modules and 1 load, wherein n is a natural number greater than or equal to 2; the n transmitting modules are connected with the negative resistor in parallel, each transmitting module consists of a transmitting coil, a transmitting end resonant capacitor and a transmitting coil equivalent internal resistance which are connected in series, and the transmitting coils of the n transmitting modules are in a decoupling or weak coupling state; the n receiving modules are connected with the load in parallel, each receiving module consists of a receiving coil, a receiving end resonant capacitor and a receiving coil equivalent internal resistance which are connected in series, and the receiving coils of the n receiving modules are in a decoupling or weak coupling state.
2. A multi-frequency many-to-one wireless power supply system based on PT symmetry principle as claimed in claim 1, wherein: the natural frequencies of the n transmitting modules are different from each other, while the natural frequency of the ith transmitting module is the same as the natural frequency of the ith receiving module, i is 1,2,3 … n, that is to say, the natural frequencies of the n transmitting modules are different from each other, namely, the natural frequencies of the ith transmitting module and the ith receiving module satisfy:
ωt1＝ωr1≠ωt2＝ωr2≠…ωtn＝ωrn
wherein the natural frequency of the i-th transmitting module is represented as
The natural frequency of the i-th receiving module is expressed as
LtiIs the inductance value of the i-th transmitting coil, LriThe inductance value of the ith receiving coil; ctiIs the ith transmitting end resonance capacitance value, CriIs the ith receiving end resonance capacitance value.
3. A multi-frequency many-to-one wireless power supply system based on PT symmetry principle as claimed in claim 1, wherein: the negative resistor consists of an alternating current controlled voltage source and a control module which are connected; the control module comprises a drive control signal generation module, a drive control signal switching module and a switch drive module which are sequentially connected; the driving control signal generating module comprises n current sampling modules and n phase control modules and is used for generating n paths of driving control signals, wherein the ith path of driving control signals is generated by the ith current sampling module and the ith phase control module, i is 1,2 and 3 … n, the input end of the ith current sampling module is connected with the ith transmitting module, the output end of the ith current sampling module is connected with the input end of the ith phase control module, the ith current sampling module samples loop current of the ith transmitting module and generates the ith path of driving control signals through the ith phase control module, and the ith path of driving control signals are square waves which are completely opposite in phase or in phase with the loop current of the ith transmitting module; the output ends of the n phase control modules are connected and then connected with the input end of the drive control signal switching module, each path of drive control signal is input to the drive control signal switching module, the drive control signal switching module only outputs one path of drive control signal to the switch drive module at the same time, wherein, the drive control signal which is in the same direction or opposite direction with the loop current of the jth transmitting module is selected according to the load position, j is 1,2,3 … n, the coupling degree between the jth transmitting module and the jth receiving module is the maximum compared with the coupling degree between the transmitting module and the receiving module with the same inherent frequency under the current load position, and the jth transmitting module and the jth receiving module need to meet the space scale-time symmetry condition:
in the formula (I), the compound is shown in the specification,
the natural frequency of the jth transmit module is indicated,
denotes the natural frequency, R, of the jth receiving moduletj、RrjEquivalent internal resistance values of jth transmitting and receiving coils, -RNIs the value of a negative resistance, -RLThe value of the load is such that,
for the coupling coefficient between the jth transmitting coil and the jth receiving coil, MtjrjIs the mutual inductance value between the jth transmitting coil and the jth receiving coil, LtjInductance of jth transmitting coilValue, LrjThe inductance value of the jth receiving coil; the switch driving module generates a driving signal of the switching device to an alternating current controlled voltage source.
4. The system according to claim 1, wherein the system comprises: the voltage and current relation of the negative resistance satisfies the following conditions: vti＝-RNItiThe phase relation satisfies:
wherein, ItiFor the current flowing through the negative resistance, VtiIs the voltage across the negative resistance, -RNIs the resistance value of the negative resistance and is automatically adjustable.
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| CN111697711A (en) * | 2020-06-17 | 2020-09-22 | 中国电力科学研究院有限公司 | Method, circuit and system for eliminating cross coupling coefficient of multi-transmitting-multi-picking-multi-load IPT system |
| CN112531922A (en) * | 2020-11-20 | 2021-03-19 | 南京理工大学 | Information feedback system based on space scale-time symmetric circuit |
| CN112635179A (en) * | 2020-12-28 | 2021-04-09 | 苏州电掣智能科技有限公司 | Wireless charging device |
| CN112803614A (en) * | 2021-03-17 | 2021-05-14 | 安徽工业大学 | Wireless power supply system based on receiving end equivalent negative resistance PT symmetry and control method |
| CN113422443A (en) * | 2021-07-26 | 2021-09-21 | 大连海事大学 | Magnetic adsorption type underwater wireless power supply system with multiple cascaded transmitting and receiving coils |
| WO2023221263A1 (en) * | 2022-05-16 | 2023-11-23 | 广西电网有限责任公司电力科学研究院 | Multi-load wireless charging system and charging method |
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| CN113422443A (en) * | 2021-07-26 | 2021-09-21 | 大连海事大学 | Magnetic adsorption type underwater wireless power supply system with multiple cascaded transmitting and receiving coils |
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