CN216929692U - PT symmetrical principle-based multiple cascaded wireless power supply system - Google Patents

PT symmetrical principle-based multiple cascaded wireless power supply system Download PDF

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CN216929692U
CN216929692U CN202122957490.2U CN202122957490U CN216929692U CN 216929692 U CN216929692 U CN 216929692U CN 202122957490 U CN202122957490 U CN 202122957490U CN 216929692 U CN216929692 U CN 216929692U
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transmitting
module
receiving
modules
coil
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吕洋
王宝昌
高飞
冯川
李昂
王元洲
崔伟峰
范广宇
官鑫
于岩
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Liaoning Electric Power Co Ltd
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Abstract

The invention discloses a PT symmetrical principle-based multiple cascade wireless power supply system, which comprises: the device comprises a transmitting device for providing electric energy and a receiving device for receiving the electric energy through magnetic coupling with the transmitting device; the transmitting device includes: the transmitting modules comprise transmitting coils, transmitting end resonant capacitors and transmitting coil equivalent internal resistance which are connected in series; the n negative resistance control modules are respectively connected with the n transmitting modules in series and comprise control modules for collecting current signals of the transmitting modules and an alternating current controlled voltage source; the receiving apparatus includes: the receiving module comprises a receiving coil, a receiving end resonant capacitor and a rectifier bridge which are connected in parallel. The invention effectively improves the output power, reduces the critical coupling coefficient of the system, namely improves the critical transmission distance of the system, and has obvious advantages for high-power application occasions.

Description

PT symmetrical principle-based multiple cascaded wireless power supply system
Technical Field
The invention relates to the technical field of wireless energy transmission or wireless power transmission, in particular to a PT symmetrical principle-based multiple cascade wireless power supply system.
Background
Compared with the traditional wire Power supply mode, the Wireless Power transmission technology has the advantages of no electrical connection, flexibility, convenience, safety, reliability and the like, and the English name of the Wireless Power transmission technology can be abbreviated as WPT. 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, the inductive wireless power transmission technology has short transmission distance and low efficiency, and the magnetic resonance wireless power transmission technology has the problems of frequency splitting, high resonance frequency, small output power, short distance and even no power output. The bottleneck problem existing in the two methods is not solved, and the practical application of the wireless power transmission technology is greatly limited. Professor bender.c.m, university of washington, 1998, created the space-time symmetric quantum theory, which has been successfully applied to many fields of optics, materials science, etc., and the space-time english is abbreviated as PT. In recent years, researchers apply the space-time symmetry quantum theory to the field of wireless power transmission and show great advantages, but the critical transmission distance of the traditional single transmitting coil system based on the space-time symmetry principle is not optimal.
Disclosure of Invention
The invention aims at the problems and provides a wireless power supply system with multiple transmitting coils and multiple receiving coils for power supply in parallel, which can realize constant transmission efficiency and output power in an area of space-time symmetry.
In order to achieve the above object, the present invention provides a multiple cascaded wireless power supply system based on PT symmetry principle, which includes: the device comprises a transmitting device for providing electric energy and a receiving device for receiving the electric energy through magnetic coupling with the transmitting device;
the transmitting device includes: the transmitting modules comprise transmitting coils, transmitting end resonant capacitors and transmitting coil equivalent internal resistance which are connected in series; the negative resistance control modules comprise control modules for collecting current signals of the transmitting modules, the output ends of the control modules are connected with the control input end of an alternating current controlled voltage source, and the power output end of the alternating current controlled voltage source is connected with the transmitting modules in series;
the receiving apparatus includes: the receiving module comprises n receiving modules and 1 load connected with the output end of the rectifier bridge of the n receiving modules in series, wherein each receiving module comprises a receiving coil, a receiving end resonant capacitor and a rectifier bridge which are connected in parallel.
Preferably, the control module includes: the current sampling module is used for collecting a current signal of the transmitting module, the input end of the current sampling module is connected with the transmitting module, and the output end of the current sampling module is connected with the input end of the phase control module; the phase control module is used for generating a driving control signal, and the output end of the phase control module is connected with the input end of the driving control signal switching module; the driving control signal switching module is used for selecting a certain path of driving control signal to the switch driving module, and the output end of the driving control signal switching module is connected with the input end of the switch driving module; the switch driving module is used for generating a driving signal to the alternating current controlled voltage source, and the output end of the switch driving module is connected with the control input end of the alternating current controlled voltage source.
In an optimal mode, when the wireless power supply system operates in a steady state, the transmitting module and the receiving module meet the space-time symmetry condition:
Figure BDA0003381281660000021
in the formula (I), the compound is shown in the specification,
Figure BDA0003381281660000022
as the natural frequency of each of the transmitting modules,
Figure BDA0003381281660000023
for the natural frequency of the respective receiving module, L PFor the inductance value of the respective transmitting coil, i.e. LP1＝LP2＝…＝LPn＝LP，LSInductance value of receiving coil, CPFor each transmitting end resonant capacitance value, i.e. CP1＝CP2＝…＝CPn＝CP，CSIs a receiving end resonance capacitance value; r isPFor each one isEquivalent internal resistance of the transmitting coil, i.e. RP1＝RP2＝…＝RPn＝RP，RPThe equivalent internal resistance value of the receiving coil; rnFor the equivalent negative resistance, R, of the negative resistance control module of each transmitting coilLIs the load resistance value.
Preferably, the parameters of the transmitting coils of the n transmitting modules are symmetrical and the coupling degrees of the transmitting coils of the n receiving modules are the same, and the transmitting coils of the n transmitting modules are completely decoupled.
The invention has the beneficial effects that: the invention effectively improves the output power, reduces the critical coupling coefficient of the system, namely improves the critical transmission distance of the system, and has obvious advantages for high-power application occasions.
Drawings
FIG. 1 is a simulation circuit diagram of the negative resistance control module portion of the present invention;
FIG. 2 is a control flow diagram of the present invention;
FIG. 3 is an equivalent circuit diagram of the operation of the ith transmitting module and the ith receiving module of the present invention;
FIG. 4 is a schematic diagram of the system initial state voltages of the present invention;
FIG. 5 is a diagram of a secondary side voltage when the system of the present invention is stable.
Detailed Description
The specific embodiment is as follows:
as shown in fig. 2, 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 transmitting device comprises n negative resistance control modules 101 and n transmitting modules LPThe receiving device comprises n receiving modules and 1 load RLWherein n is a natural number greater than or equal to 2; n transmitting modules are connected in series with n negative resistance control modules 101, each transmitting module being formed by a transmitting coil L connected in seriesPiA transmitting end resonant capacitor CPiAnd equivalent internal resistance R of transmitting coilSiTransmitting coil L comprising 1, 2, 3 … n, n transmitting modulesPiAre decoupled or weak from each otherA coupled state; receiving module and load RLConnected in parallel, each receiving module being formed by a receiving coil L connected in seriesSiReceiving end resonant capacitor CSiReceiving coil L comprising n receiving modules, i 1, 2, 3 … nSiAre decoupled or weakly coupled to each other.
The negative resistance control module 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 drive control signals, wherein the i-th drive control signal is generated by the i-th current sampling module 101-211 and the i-th phase control module 101-212, the input end of the i-th current sampling module 101-211 is connected with the i-th emission module, the output end of the i-th current sampling module 101-211 is connected with the input end of the i-th phase control module 101-212, specifically, the ith current sampling module 101-211 samples the loop current of the ith transmitting module 102, and the ith phase control module 101-212 generates an ith driving control signal, where the ith driving control signal is a square wave completely in opposite phase or in phase with the loop current of the ith transmitting module, and i is 1, 2, 3 … n; 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 voltage and current relation of the equivalent negative resistance of the transmitting coil negative resistance module meets the following requirements: v1＝-RnIRnThe phase relation satisfies:
Figure BDA0003381281660000049
IRnin order to flow the equivalent negative resistance current,V1is the voltage across the equivalent negative resistance, -RnIs the resistance value of the equivalent negative resistance and is automatically adjustable.
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. 3 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. 3:
Figure BDA0003381281660000041
Figure BDA0003381281660000042
and
Figure BDA0003381281660000043
as a current vector in the loop, let
Figure BDA0003381281660000044
Is the natural frequency of the primary loop,
Figure BDA0003381281660000045
is the natural frequency of the secondary loop;
simplifying the step (1) into the following steps:
Figure BDA0003381281660000046
then (2) the condition with non-zero solution is:
Figure BDA0003381281660000047
the real-imaginary part separation of (3) can obtain:
Figure BDA0003381281660000048
when the primary loop and the secondary loop form an astronomical-time symmetric circuit, the following are provided:
Figure BDA0003381281660000051
then (4) can be simplified to:
Figure BDA0003381281660000052
Can be solved to obtain:
Figure BDA0003381281660000053
the condition that a pure real solution exists for the frequency obtained from (7) is as follows:
Figure BDA0003381281660000054
the load resistance should satisfy:
Figure BDA0003381281660000055
efficiency at this time:
Figure BDA0003381281660000056
transmission power:
Figure BDA0003381281660000057
however, the coupling relationship between the transmitter coil i and the receiver coils 1, 2, 3, 4.. No. n is similar to the above-described state, i.e., the coils are substantially coupled to the respective coils in the strong coupling region. The invention has the advantage that the output power can be changed by plugging and unplugging the transmitting modules.
The invention is mainly applied to the unmanned ship lithium battery charging, has good waterproof and dustproof effects in appearance design, and can be applied to the underwater environment for a long time.
The coil used by the invention uses the Archimedes coil, improves the conventional calculation method of coil mutual inductance, self-inductance and resistance by using an Archimedes spiral equation, obtains a more accurate calculation method, and carries out simulation verification on a theoretical calculation result by COMSOL. Under the condition of small turn-to-turn distance, the theoretical and simulation errors of self inductance and mutual inductance are within 5 percent. And (4) giving corresponding limiting conditions, and solving the number of turns and the inner radius when the coil transmission efficiency reaches an optimal value through MATLAB. And finally, winding the optimally designed planar spiral coil, and measuring that the self-inductance error of the coil is within 0.84 muH and the mutual-inductance error is within 1.3 muH through experiments, wherein the optimal transmission efficiency of the coil level comprising the resonance capacitor is over 95 percent.
As shown in fig. 1, the circuit diagram is a simulation of the negative resistance control module part by ltspic, which can realize the transmission of the voltage ratio of 1 between the coupling coefficient of 0.09 and 1. The system of the invention does not need any tuning during starting, and the space state is reached in a plurality of cycles as shown in figure 4 when k is more than 2 gamma2At 0.34, the system operates in a strongly coupled region. It can be seen from the figure that when the circuit works in the strong coupling region, the ratio of the effective value of the output voltage of the circuit to the effective value of the input voltage of the primary circuit is basically unchanged as shown in fig. 5, and when k is less than 0.05 or so, the ratio of the voltage starts to decline, and the result is basically consistent with the theory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (4)

1. A multiple cascaded wireless power supply system based on PT symmetry principle, characterized in that it comprises: the device comprises a transmitting device for providing electric energy and a receiving device for receiving the electric energy through magnetic coupling with the transmitting device;
The transmitting device includes: the device comprises n transmitting modules, a receiving module and a control module, wherein the transmitting modules comprise transmitting coils, transmitting end resonance capacitors and transmitting coil equivalent internal resistances which are connected in series; the negative resistance control modules are respectively connected with the n transmitting modules in series, each negative resistance control module comprises a control module for collecting current signals of the transmitting module, the output end of the control module is connected with the control input end of an alternating current controlled voltage source, and the power output end of the alternating current controlled voltage source is connected with the transmitting module in series;
the receiving apparatus includes: the receiving module comprises n receiving modules and 1 load connected with the output end of the rectifier bridge of the n receiving modules in series, wherein each receiving module comprises a receiving coil, a receiving end resonant capacitor and a rectifier bridge which are connected in parallel.
2. The PT symmetry principle based multiple cascaded wireless power supply system of claim 1, wherein the control module comprises: the current sampling module is used for collecting a current signal of the transmitting module, the input end of the current sampling module is connected with the transmitting module, and the output end of the current sampling module is connected with the input end of the phase control module; the phase control module is used for generating a driving control signal, and the output end of the phase control module is connected with the input end of the driving control signal switching module; the driving control signal switching module is used for selecting a certain path of driving control signal to the switch driving module, and the output end of the driving control signal switching module is connected with the input end of the switch driving module; the switch driving module is used for generating a driving signal to the alternating current controlled voltage source, and the output end of the switch driving module is connected with the control input end of the alternating current controlled voltage source.
3. The PT symmetry principle-based multiple cascaded wireless power supply system of claim 1, wherein the transmitting module and the receiving module satisfy an astronomical-time symmetry condition in steady state operation of the wireless power supply system:
Figure FDA0003381281650000011
in the formula (I), the compound is shown in the specification,
Figure FDA0003381281650000012
as the natural frequency of each of the transmitting modules,
Figure FDA0003381281650000013
for the natural frequency of the respective receiving module, LPFor the inductance value of the respective transmitting coil, i.e.
Figure FDA0003381281650000014
LSInductance value for the receiving coil, CPFor the value of the resonant capacitance of each transmitting terminal, i.e.
Figure FDA0003381281650000015
CSIs a receiving end resonance capacitance value; r isPFor each transmitting coil equivalent internal resistance, i.e.
Figure FDA0003381281650000021
RSThe equivalent internal resistance value of the receiving coil; rnFor the equivalent negative resistance, R, of the negative resistance control module of each transmitting coilLIs the load resistance value.
4. The PT symmetric principle based multiple cascaded wireless power supply system of claim 1, wherein the transmitting coils of the n transmitting modules are symmetric in parameters and coupled with the receiving coils of the n receiving modules to the same degree, and the transmitting coils of the n transmitting modules are completely decoupled from each other.
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