CN108711950B - Circuit topology for improving long-distance wireless power transmission voltage gain and design method thereof - Google Patents

Circuit topology for improving long-distance wireless power transmission voltage gain and design method thereof Download PDF

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CN108711950B
CN108711950B CN201810560671.1A CN201810560671A CN108711950B CN 108711950 B CN108711950 B CN 108711950B CN 201810560671 A CN201810560671 A CN 201810560671A CN 108711950 B CN108711950 B CN 108711950B
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resonance
capacitor
compensation network
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compensation
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魏国
张成良
朱春波
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Harbin Institute of Technology
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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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

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Abstract

The invention provides a topological structure circuit for linearly improving voltage gain of long-distance wireless electric energy transmission and a parameter design method, and belongs to the technical field of wireless electric energy transmission. The topological structure circuit comprises a primary side resonance compensation network and a secondary side series compensation network. The topological structure circuit and the parameter design method for linearly improving the voltage gain of the long-distance wireless electric energy transmission have the characteristic of effectively improving the voltage gain.

Description

Circuit topology for improving long-distance wireless power transmission voltage gain and design method thereof
Technical Field
The invention relates to a circuit topology for improving remote wireless transmission voltage gain and a design method thereof, belonging to the technical field of wireless power transmission.
Background
As a relatively ideal electric energy transmission mode, wireless electric energy transmission has higher safety and convenience compared with traditional wired electric energy transmission, and is rapidly developed in recent years. According to the grade of transmission power, the power is applied to mobile phones, household appliances, various mobile robots, electric vehicles and the like, and has wide development prospect. The transmission distance of wireless power transmission is an important index, and has been the focus of attention. Generally, for a wireless power transmission system, when the voltage at the input end remains unchanged, the receiving end can obtain a larger power output in the same transmission distance, and the higher the voltage gain of the system is, the stronger the wireless power transmission capability of the system is.
For the topological structure of the wireless power transmission system, the serial-serial structure is widely applied by the advantages of simple structure, mature technology and the like, and is also the topological structure which is most applied in the engineering field at present. Although the string-string structure has a reliable structure and a strong adaptability, the string-string structure has certain defects, and the output voltage, namely the voltage gain, is greatly influenced by the coupling coefficient. When the system is in long-distance power transmission, the corresponding coupling coefficient is often low at the moment, the system is in a weak coupling state, and under the condition, the voltage gain of the series-series structure can be rapidly reduced, so that the transmission power is reduced, and the power transmission requirement on the occasion of the weak coupling coefficient cannot be met.
Disclosure of Invention
Compared with the series-series structure, the topological structure circuit for linearly improving the voltage gain of the remote wireless electric energy transmission can linearly improve the voltage gain of the system only by adjusting the ratio of the compensation capacitor under the condition of the same transmission distance so as to meet the actual system requirement. The circuit topology for improving the long-distance wireless transmission voltage gain and the design method thereof improve the topological structure circuit for improving the long-distance transmission voltage gain and the design method thereof, and the adopted technical scheme is as follows:
a topological structure circuit for linearly improving voltage gain of long-distance wireless electric energy transmission comprises a primary side resonance compensation network and a secondary side series compensation network; the primary side resonance compensation network comprises a full-bridge inverter circuit 1, a resonance compensation network capacitor I2, a resonance compensation network inductor I3, a resonance compensation network inductor II 4, a resonance compensation network capacitor II 5, a parallel capacitor 6 and a primary side transmitting coil 7; one output end of the full-bridge inverter circuit is connected in series with the first resonance compensation network capacitor 2 and the first resonance compensation network inductor 3; two ends of the first resonance compensation network inductor 3 are connected in parallel with a series structure of a second resonance compensation network inductor 4, a second resonance compensation network capacitor 5 and a parallel capacitor 6; two ends of the parallel capacitor 6 are connected with the primary side transmitting coil 7 in parallel; the secondary side series compensation network comprises a secondary side receiving coil 8 and a series compensation capacitor 9; the secondary side receiving coil 8 is connected in series with a series compensation capacitor 9.
Further, the secondary side receiving coil and the series compensation capacitor are in a resonance state; the parallel capacitor and the primary side transmitting coil are in a resonance state, and the resonance state of the secondary side receiving coil and the series compensation capacitor is the same as the resonance frequency of the parallel capacitor and the primary side transmitting coil.
A parameter design method of the topological structure circuit comprises the following steps:
the method comprises the following steps: obtaining series compensation capacitor C according to inverter switch angular frequency modelSAnd a parallel capacitor CPWherein the inverter switching angular frequency model is:
Figure GDA0002424151980000021
in the model, ω is the switching angular frequency of the inverter operation, LPExpressed as the magnitude of the self-inductance of the system transmitting coil, CPExpressed as a compensation capacitance in series resonance with the transmitter coil, LSExpressed as the magnitude of the self-inductance of the system receiving coil, CSA compensation capacitor expressed as a series resonance with the receiving coil;
step two: determining a basic relationship between compensation elements according to a network structure of the topology circuit, wherein a model of the basic relationship is as follows:
Figure GDA0002424151980000022
wherein L is1A No. 1 compensation inductance representing a primary side compensation network; c1A compensation capacitor No. 1 representing a primary side compensation network; c2A No. 2 compensation capacitor representing the primary side compensation network;
step three: acquiring specific values of the compensation elements according to a compensation element acquisition model, wherein the compensation element acquisition model is as follows:
Figure GDA0002424151980000023
wherein a is a linear boost multiple required by voltage gain;
step four: obtaining a current value in a topological structure transmitting coil according to a transmitting coil current model, wherein the transmitting coil current model is as follows:
Figure GDA0002424151980000024
wherein, UinThe AC voltage is output by the inverter circuit; roIs a load resistor; rsIs the internal resistance of the receiving coil; omegaoIs the resonant frequency; m is mutual inductance between the transmitting coil and the receiving coil; rPIs the internal resistance of the transmitting coil;
step five: and the parameter values obtained in the third step and the fourth step are the parameters of the topological structure circuit.
The invention has the beneficial effects that:
compared with the traditional series-series topological structure, the topological structure circuit for linearly improving the voltage gain of the long-distance wireless electric energy transmission has the characteristic of linearly improving the voltage gain of the wireless electric energy transmission system according to the self capacitance ratio of the topological structure under the condition of fixing the coupling coefficient, and is used for meeting the requirement of the high voltage gain of the system under the long-distance condition. In addition, compared with a series-series structure, the topological structure provided by the invention is combined with a parameter design method thereof, and the voltage gain linear improvement multiple is independent of the coupling coefficient of the system at the moment, namely, the voltage gain linear improvement multiple is not limited by the coupling coefficient under the remote condition (the voltage gain linear improvement value of the traditional series-series structure is limited by the coupling coefficient of the system, namely, the voltage gain is improved to a certain degree and cannot be improved to the required multiple under the limitation of the coupling coefficient), the voltage gain can be improved to any multiple according to the actual requirement, and the any multiple comprises any high multiple allowed by the system, such as 6 times, 8 times, 10 times and the like, so that the topological structure is suitable for improving the voltage gain under any coupling coefficient.
Drawings
Fig. 1 is a diagram of the novel topology of the present invention for linearly increasing voltage gain for long-range wireless power transmission.
Figure 2 is a schematic diagram of the primary side novel compensation network.
Fig. 3 is a system equivalent circuit diagram.
Fig. 4 is a current variation curve of the transmitting coil in the series-series structure and the novel topological structure.
Fig. 5 is a graph of the system coupling coefficient as a function of transmission distance.
Fig. 6 is a voltage gain comparison of a string-string architecture versus a new topology system.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1:
a topological structure circuit for linearly improving voltage gain of long-distance wireless electric energy transmission is disclosed, as shown in figure 1, the topological structure circuit comprises a primary side resonance compensation network and a secondary side series compensation network; the primary side resonance compensation network comprises a full-bridge inverter circuit 1, a resonance compensation network capacitor I2, a resonance compensation network inductor I3, a resonance compensation network inductor II 4, a resonance compensation network capacitor II 5, a parallel capacitor 6 and a primary side transmitting coil 7; one output end of the full-bridge inverter circuit is connected in series with the first resonance compensation network capacitor 2 and the first resonance compensation network inductor 3; two ends of the first resonance compensation network inductor 3 are connected in parallel with a series structure of a second resonance compensation network inductor 4, a second resonance compensation network capacitor 5 and a parallel capacitor 6; two ends of the parallel capacitor 6 are connected with the primary side transmitting coil 7 in parallel; the secondary side series compensation network comprises a secondary side receiving coil 8 and a series compensation capacitor 9; the secondary side receiving coil 8 is connected in series with a series compensation capacitor 9.
The secondary receiving coil and the series compensation capacitor are in a resonance state; the parallel capacitor and the primary side transmitting coil are in a resonance state, and the resonance state of the secondary side receiving coil and the series compensation capacitor is the same as the resonance frequency of the parallel capacitor and the primary side transmitting coil.
Example 2
A parameter design method of the topological structure circuit comprises the following steps:
the method comprises the following steps: obtaining series compensation capacitor C according to inverter switch angular frequency modelSAnd a parallel capacitor CPWherein the inverter switching angular frequency model is:
Figure GDA0002424151980000041
in the model, ω is the switching angular frequency of the inverter operation, LPExpressed as the magnitude of the self-inductance of the system transmitting coil, CPExpressed as a compensation capacitance in series resonance with the transmitter coil, LSShown as the system receive coilMagnitude of self-induction of (C)SA compensation capacitor expressed as a series resonance with the receiving coil;
step two: determining a basic relationship between compensation elements according to a network structure of the topology circuit, wherein a model of the basic relationship is as follows:
Figure GDA0002424151980000042
wherein L is1A No. 1 compensation inductance representing a primary side compensation network; c1A compensation capacitor No. 1 representing a primary side compensation network; c2A No. 2 compensation capacitor representing the primary side compensation network; namely L1An inductance value of a resonance compensation network inductance in the topological structure circuit; c1A capacitance value of a resonance compensation network capacitor in the topological structure circuit; c2The two capacitance values of the resonance compensation network capacitor in the topological structure circuit.
Step three: acquiring specific values of the compensation elements according to a compensation element acquisition model, wherein the compensation element acquisition model is as follows:
Figure GDA0002424151980000043
wherein a is a linear boost multiple required by the voltage gain, when the series-series topology structure performs wireless power transmission under a long distance, the voltage gain corresponding to the series-series topology structure is only G due to the long distanceoAnd the voltage gain required by the system is GN，GN＞GoThen, the voltage gain of the system needs to be increased by a times linearly at this time, where a is defined as follows:
Figure GDA0002424151980000051
step four: obtaining a current value in a topological structure transmitting coil according to a transmitting coil current model, wherein the transmitting coil current model is as follows:
Figure GDA0002424151980000052
wherein, UinThe AC voltage is output by the inverter circuit; roIs a load resistor; rsIs the internal resistance of the receiving coil; omegaoIs the resonant frequency; m is mutual inductance between the transmitting coil and the receiving coil; rPIs the internal resistance of the transmitting coil;
step five: and the parameter values obtained in the third step and the fourth step are the parameters of the topological structure circuit.
Example 3
The embodiment provides a topological structure circuit for linearly improving voltage gain of long-distance wireless power transmission, and the topological structure is as shown in fig. 1, wherein a primary side adopts a novel resonance compensation network, and a secondary side adopts series compensation. In FIG. 1, UdcIs the DC bus voltage, Q, of an inverter circuit1、Q2、Q3、Q4Forming a full bridge inverter circuit. Primary side is composed of a transmitting coil LPParallel capacitor CPAnd from L1，C1，L2And C2Formed novel impedance compensation network structure, RPIs the internal resistance of the transmitting coil. L issTo receive coils, CsIs a series capacitor, RsIs used for receiving the coil resistance. M is the mutual inductance between the transmitter coil and the receiver coil,
Figure GDA0002424151980000053
where k is the coupling coefficient.
The reactance relationship among the parameters in the topological structure is shown as the formula (1), wherein: l isPAnd CP、LsAnd Cs、L1And C1In a resonant state and having the same resonant frequency, L2＝LP，C2＝C1
Figure GDA0002424151980000061
The novel compensation network of the primary side of the system is shown in figure 2Shown in the figure. In the figure, UinIs the alternating voltage output by the inverter circuit. Resonant frequency
Figure GDA0002424151980000062
Defining the parameter a as the capacitance C1And CPRatio of (i) to (ii)
Figure GDA0002424151980000063
And a is more than or equal to 1,
according to the relation of the formula (1), there are:
Figure GDA0002424151980000064
the equivalent circuit model of the system is shown in fig. 3. In FIG. 3, IinIs the input current of the system, IPIs the current of the transmitting coil. System total input impedance Z for deducing novel topological structureinComprises the following steps:
Figure GDA0002424151980000065
according to equation (3), when in resonance, the system inputs current IinThe expression of (a) is:
Figure GDA0002424151980000066
order to
Figure GDA00024241519800000611
The current I of the primary coilPCan be expressed as:
Figure GDA0002424151980000067
wherein Z isL1Is the inductive reactance value of the inductor, ZL1＝jωoL1，ZC1Is the capacitance-capacitance reactance value of the capacitor,
Figure GDA0002424151980000068
IPthe expression of (c) can be organized as:
Figure GDA0002424151980000069
transmitting coil current IPCan be further expressed as:
Figure GDA00024241519800000610
according to the formula (7), compared with the traditional series-series structure, the novel topological structure has the advantages that the current of the system transmitting coil is increased by a times under the same coupling coefficient, the electric energy transmission capability of the system is effectively improved, and the novel topological structure and the current I of the series-series structure transmitting coil are obtained when the parameter a takes different valuesPThe waveform is shown in fig. 4, and compared with the series-series structure, the current of the transmitting coil is improved by the same factor as the value of the parameter a.
According to the mutual inductance principle, the secondary side induction voltage is omegaoMIPThe expression of the load voltage:
Figure GDA0002424151980000071
when the system coil parameter is fixed, the output voltage can be adjusted by setting the parameter a according to the output voltage expression. The gain G of the voltage can be expressed as:
Figure GDA0002424151980000072
when the parameter a is 1, equation (9) is converted into the system voltage gain of the serial-to-serial structure. It can be seen that the voltage gain of the new topology is a times that of the corresponding string-to-string structure when the coupling coefficient is fixed. The system voltage gain is improved linearly, and the linear amplification factor a of the system voltage gain is only equal to C in the system topological structure1/CPIt is related. When the coupling coefficient is lower, the voltage gain of the series-series structure is very small, which further leads to the reduction of the transmission power of the system, and the novel developmentThe flapping structure can linearly improve the voltage gain of the system by utilizing the characteristics of the flapping structure, and further can realize the transmission of higher power under the condition of weak coupling.
The variation curve of the coupling coefficient with the transmission distance is shown in figure 5. As can be seen from fig. 5 and 6, when the transmission distance is varied from 10 to 30cm, the corresponding coupling coefficient is varied from 0.03 to 0.16. When the value of the parameter a is 2, and the system is in different coupling coefficients, the voltage gain of the novel topological structure is 2 times of the voltage gain of the string-string structure under the same condition, and is irrelevant to the coupling coefficient, meanwhile, the output voltage gain of the novel topological structure at the farthest transmission distance reaches 3.5, and compared with the same distance of the string structure, the voltage gain is improved by more than 2 times, and the superiority of the novel topological structure in the aspect of improving the voltage gain of the system is proved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A parameter design method for a topological structure circuit for linearly improving voltage gain of long-distance wireless electric energy transmission is based on the topological structure circuit for linearly improving the voltage gain of the long-distance wireless electric energy transmission, and the topological structure circuit comprises a primary side resonance compensation network and a secondary side series compensation network; the primary side resonance compensation network comprises a full-bridge inverter circuit (1), a resonance compensation network capacitor I (2), a resonance compensation network inductor I (3), a resonance compensation network inductor II (4), a resonance compensation network capacitor II (5), a parallel capacitor (6) and a primary side transmitting coil (7); one output end of the full-bridge inverter circuit is connected with the first resonance compensation network capacitor (2) and the first resonance compensation network inductor (3) in series; two ends of the first resonance compensation network inductor (3) are connected in parallel with a series structure of a second resonance compensation network inductor (4), a second resonance compensation network capacitor (5) and a parallel capacitor (6); two ends of the parallel capacitor (6) are connected with the primary side transmitting coil (7) in parallel; the secondary side series compensation network comprises a secondary side receiving coil (8) and a series compensation capacitor (9); the secondary side receiving coil (8) is connected with a series compensation capacitor (9) in series, and the parameter design method is characterized by comprising the following steps:
the method comprises the following steps: obtaining series compensation capacitor C according to inverter switch angular frequency modelSAnd a parallel capacitor CPWherein the inverter switching angular frequency model is:
Figure FDA0002383828290000011
in the model, ω is the switching angular frequency of the inverter operation, LPExpressed as the magnitude of the self-inductance of the system transmitting coil, CPExpressed as a compensation capacitance in series resonance with the transmitter coil, LSExpressed as the magnitude of the self-inductance of the system receiving coil, CSA compensation capacitor expressed as a series resonance with the receiving coil;
step two: determining a basic relationship between the compensation elements according to a network structure of the topology circuit, wherein a model of the basic relationship is:
Figure FDA0002383828290000012
wherein L is1Representing a first resonance compensation network inductance of the primary resonance compensation network; c1A first resonance compensation network capacitor representing a primary resonance compensation network; c2A second resonance compensation network capacitor representing the primary resonance compensation network;
step three: acquiring specific values of the compensation elements according to a compensation element acquisition model, wherein the compensation element acquisition model is as follows:
Figure FDA0002383828290000013
wherein a is a linear boost multiple required by voltage gain;
step four: obtaining a current value in a topological structure transmitting coil according to a transmitting coil current model, wherein the transmitting coil current model is as follows:
Figure FDA0002383828290000021
wherein, UinThe AC voltage is output by the inverter circuit; roIs a load resistor; rsIs the internal resistance of the receiving coil; omegaoIs the resonant frequency; m is mutual inductance between the transmitting coil and the receiving coil; rPIs the internal resistance of the transmitting coil;
step five: and the parameter values obtained in the third step and the fourth step are the parameters of the topological structure circuit.
2. The parameter design method of topological structure circuit for linearly increasing voltage gain of long-distance wireless power transmission according to claim 1, characterized in that said secondary side receiving coil (8) and series compensation capacitor (9) are in resonance; the parallel capacitor (6) and the primary side transmitting coil (7) are in a resonance state, and the resonance state of the secondary side receiving coil (8) and the series compensation capacitor (9) is the same as the resonance frequency of the parallel capacitor (6) and the primary side transmitting coil (7).
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WO2015053246A1 (en) * 2013-10-09 2015-04-16 株式会社村田製作所 Wireless power transmission system
CN105186646A (en) * 2015-10-12 2015-12-23 华中科技大学 Dynamic wireless charging apparatus and parameter acquiring method thereof
CN105529837A (en) * 2016-01-28 2016-04-27 东南大学 Method for determining constant voltage compensation network topology of wireless power transmission system
CN105811592A (en) * 2014-12-30 2016-07-27 中国科学院沈阳自动化研究所 Compensation topology circuit of inductive electric energy transmission system

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