CN114513057B - A dual-load capacitive energy transmission system - Google Patents
A dual-load capacitive energy transmission system Download PDFInfo
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- CN114513057B CN114513057B CN202210155832.5A CN202210155832A CN114513057B CN 114513057 B CN114513057 B CN 114513057B CN 202210155832 A CN202210155832 A CN 202210155832A CN 114513057 B CN114513057 B CN 114513057B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 48
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 238000010168 coupling process Methods 0.000 claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 claims abstract description 16
- 230000005684 electric field Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 11
- 101150092843 SEC1 gene Proteins 0.000 description 2
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- 230000009286 beneficial effect Effects 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
-
- 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
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
-
- 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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a double-load capacity energy transmission system, which comprises an inverter, a compensation circuit, a transmitting module, a first receiving module and a second receiving module, wherein one end of a primary side compensation circuit is connected with the inverter, the other end of the primary side compensation circuit is connected with the transmitting module, the transmitting module comprises a first transmitting polar plate P 1 and a second transmitting polar plate P 2, the first receiving module comprises a first receiving polar plate P 3 and a second receiving polar plate P 4, the second receiving module comprises a third receiving polar plate P 5 and a fourth receiving polar plate P 6, the transmitting module, the first receiving module and the second receiving module are parallel to each other, and the first receiving module and the second receiving module are mutually perpendicular and are 45 degrees with the transmitting module. The transmission system of the invention supplies power to two loads simultaneously, has low cost and simple structure, and realizes the decoupling of the polar plate electric field and the independent control of the load power by the design of the coupling polar plate and the compensation loop, and the output current is irrelevant to the load.
Description
Technical Field
The invention relates to the technical field of wireless energy transmission, in particular to a double-load capacity energy transmission system.
Background
The capacitive energy transmission system uses the electric field as a medium to transmit energy, and does not need physical contact between an energy transmitting end and a receiving end, thereby realizing wireless energy transmission. The CPT system generates high-frequency alternating high voltage on the transmitting polar plate through the inverter and the primary side compensation circuit, and the secondary side also generates high voltage on the receiving polar plate through the sampling compensation circuit, so that the problem of low transmission power caused by small coupling capacitance is solved.
The traditional research targets for CPT systems are mainly single-load energy transmission systems. The existing power control of multi-load power supply is a difficult point, and load power decoupling needs to be realized, so that mutual interference among load powers is avoided.
Based on the above problems, a dual load capacity energy transmission system is designed.
Disclosure of Invention
The invention aims to provide a double-load capacity energy transmission system, which solves the problem of power control of two loads simultaneously powered in the prior art.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides a double-load capacity energy transmission system, transmission system includes dc-to-ac converter, compensation circuit, transmitting module, first receiving module and second receiving module, and primary side compensation circuit's one end is connected with the dc-to-ac converter, and the other end is connected with transmitting module, and transmitting module includes first transmitting polar plate P 1 and second transmitting polar plate P 2, and first receiving module includes first receiving polar plate P 3 and second receiving polar plate P 4, and second receiving module includes third receiving polar plate P 5 and fourth receiving polar plate P 6.
The transmitting module, the first receiving module and the second receiving module are parallel to each other, and the first receiving module and the second receiving module are perpendicular to each other and form 45 degrees with the transmitting module.
Further, the inverter comprises four high-frequency electronic switching devices, and inverts the voltage V dc of the direct-current input into a high-frequency alternating voltage source.
Further, a coupling capacitor is arranged between any two polar plates, six polar plate coupling capacitor models are converted into voltage-controlled current models, as shown in the following formula,
Wherein: the coupling capacitance between the polar plate P i and the polar plate P j is C ij,i,j＝1,2,3,4,5,6,i≠j,CM12, C M13, and C M23, respectively, is an equivalent mutual capacitance between the transmitting polar plate and the first receiving module, and between the transmitting polar plate and the second receiving module, and between the first receiving module and the second receiving module;
The first receiving module and the second receiving module are perpendicular to each other, so that C M23 =0 is deduced, electric field decoupling is achieved between the first receiving module and the second receiving module, independent decoupling is achieved between the first receiving module and the second receiving module, and the size of the voltage-controlled current source is 0.
Further, the compensating inductor of the transmission system adopts a form of split inductor, the compensating inductor is split into two equal inductors on the input and output branches, for example, on the primary side, the first compensating inductor L f,1 is split into a first inductor L f,1_1 and a second inductor L f,1_2 with equal inductance values, the second compensating inductor L 1 is split into a third inductor L 1_1 and a fourth inductor L 1_2 with equal inductance values, and due to the symmetry of the circuit, the transmitting module, the first receiving module and the second receiving module can be converted into a two-port network by adopting the above compensating mode.
Further, the primary LCLC compensation circuit in the transmission system generates a constant voltage V 1,Rref on the transmitting module, which is the secondary-to-primary reflection impedance, Z in3 is the equivalent input impedance of the module 3, Z in2 is the equivalent input impedance of the module 2, Z in1 is the equivalent input impedance of the module 1, i.e. the equivalent load impedance Z in,Zi of the inverter is the impedance of each module, i=1, 2,3 … … 9;
The calculations for Z in1、Zin2 and Z in3 are as follows:
To obtain the equivalent impedance Z sec of the resistance in order to achieve soft switching operation of the inverter switching device, the following formula needs to be satisfied:
the primary compensation network parameters can be calculated by the following formula:
Wherein: omega is the angular frequency and C 1 is the compensation capacitance.
Furthermore, the secondary side LCLC compensation circuit in the transmission system generates constant current output in the load, the two load compensation circuits have the same design, and the compensation network of one load comprises: r L is the load impedance, Z in6 is the equivalent input impedance of module 6, Z in5 is the equivalent input impedance of module 5, and Z in4 is the equivalent input impedance of module 4, namely the secondary equivalent impedance Z sec1;
Z in6、Zin5 and Z in4 can be calculated as follows:
to obtain a resistive Z sec, the following formula needs to be satisfied:
the calculation formula of the secondary side compensation network parameters is as follows:
further, a load current in the transmission system is:
Wherein Z CM12＝1/ωCM12;
Similarly, the other load current is calculated as follows:
Wherein Z CM13＝1/ωCM13.
Further, if the two load currents in the transmission system are constant and are independent of the load resistance, the load power is independently controlled.
The invention has the beneficial effects that:
1. The transmission system adopts the inverter, the compensation circuit, the transmitting module, the first receiving module and the second receiving module, and the coupling capacitor is arranged between any two polar plates, so that two loads can be simultaneously powered, the cost is low, and the structure is simple;
2. According to the transmission system, through the design of the coupling polar plate and the compensation loop, the decoupling of the polar plate electric field and the independent control of load power are realized, and the output current is irrelevant to the load.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a transmission system of the present invention;
FIG. 2 is a schematic diagram of a capacitive coupler according to the present invention;
FIG. 3 is a schematic diagram of a fully coupled capacitor model structure according to the present invention;
FIG. 4 is a schematic diagram of a compensation circuit configuration of the transmission system of the present invention;
FIG. 5 is a schematic diagram of a primary compensation network of the present invention;
FIG. 6 is a schematic diagram of a first secondary compensation network configuration of the present invention;
FIG. 7 is a schematic diagram of a second secondary compensation network configuration of the present invention;
FIG. 8 is a schematic view of the structure of the film pressing device of the present invention;
FIG. 9 is a simulated waveform diagram of a transmission system of the present invention;
FIG. 10 is a simulated waveform diagram of a transmission system of the present invention;
Fig. 11 is a simulated waveform diagram of a transmission system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The transmission system comprises an inverter, a compensation circuit, a transmitting module, a first receiving module and a second receiving module, wherein one end of a primary side compensation circuit is connected with the inverter, the other end of the primary side compensation circuit is connected with the transmitting module, and the inverter comprises four high-frequency electronic switching devices for inverting a voltage V dc input by direct current into a high-frequency alternating voltage source. As shown in fig. 2, the transmitting module includes a first transmitting electrode plate P 1 and a second transmitting electrode plate P 2, the first transmitting electrode plate P 1 and the second transmitting electrode plate P 2 are located on the same plane, the first receiving module includes a first receiving electrode plate P 3 and a second receiving electrode plate P 4, the first receiving electrode plate P 3 and the second receiving electrode plate P 4 are located on the same plane, the second receiving module includes a third receiving electrode plate P 5 and a fourth receiving electrode plate P 6, and the third receiving electrode plate P 5 and the fourth receiving electrode plate P 6 are located on the same plane.
The first transmitting polar plate P 1, the second transmitting polar plate P 2, the first receiving polar plate P 3, the second receiving polar plate P 4, the third receiving polar plate P 5 and the fourth receiving polar plate P 6 are all arranged in parallel, the first receiving module and the second receiving module are mutually perpendicular and are all 45 degrees with the transmitting module, as shown in fig. 3, coupling capacitors are arranged between any two polar plates, and 15 coupling capacitors are arranged among the six polar plates, wherein the coupling capacitors are not shown in the diagram of C 25、C16.
The first receiving module and the second receiving module both obtain energy from the transmitting module through electric field coupling, an LCLC compensation circuit is used in the energy transmitting part and each receiving part, a compensation capacitor C f,1 is arranged between the two compensation inductors, and the compensation capacitor C ex1 is connected in parallel between the transmitting polar plates P 1 and P 2. After the first receiving module passes through the compensation circuit, power is supplied to a load R L1; the second receiving module supplies power to the load R L2 after passing through the compensation circuit. The compensating inductor is split into two equal inductors on the input and output branches, such as the primary side, the first compensating inductor L f,1 is split into a first inductor L f,1_1 and a second inductor L f,1_2 with equal inductance values, and the second compensating inductor L 1 is split into a third inductor L 1_1 and a fourth inductor L 1_2 with equal inductance values. Due to the symmetry of the circuits, the circuits of the transmitting module, the first receiving module and the second receiving module can be converted into a two-port network by adopting the compensation mode, so that the system analysis is convenient to simplify.
As shown in fig. 4 and 5, the transmission system can be simplified into a plurality of two-port networks because of the symmetry of the circuit, the six-pole plate coupling capacitance model is converted into a voltage-controlled current model, the coupling capacitance between any one pole plate P i and the other pole plate P j is C ij, i, j=1, 2,3,4,5,6, i not equal to j, as shown in the following formula,
Wherein: c M12 is the equivalent mutual capacitance between the transmitting electrode plate and the first receiving module, C M13 is the equivalent mutual capacitance between the transmitting electrode plate and the second receiving module, and C M23 is the equivalent mutual capacitance between the first receiving module and the second receiving module.
Because the first receiving module and the second receiving module are perpendicular to each other, then C 46*C35-C36*C45 =0, that is, C M23 =0, electric field decoupling is realized between the first receiving module and the second receiving module, the voltage-controlled current model is further simplified, independent decoupling is realized between the first receiving module and the second receiving module, and the voltage-controlled current source size is 0.
The calculation formula of the voltage between the polar plates is as follows:
the voltage of the transmitting module and the voltage of the first receiving module are equal under the rated working condition, namely V c1＝Vc2. According to the above formula:
The load currents are:
The power obtained by each load is respectively as follows:
Then this Z 5 and Z 8 are calculated as follows:
Z 1、Z6 and Z 9 are calculated as follows:
the compensation parameter technique is as follows:
As shown in fig. 6, in the transmission system, a primary LCLC compensation circuit is designed to generate a constant voltage V 1 on the transmitting module, and the compensation circuit is designed as follows:
r ref is the secondary to primary reflection impedance, Z in3 is the equivalent input impedance of module 3, Z in2 is the equivalent input impedance of module 2, Z in1 is the equivalent input impedance of module 1, i.e. the equivalent load impedance of the inverter Z in,Zi is the impedance of each module, i=1, 2,3 … …. The calculations for Z in1、Zin2 and Z in3 are as follows:
To obtain the equivalent impedance Z sec of the resistance in order to achieve soft switching operation of the inverter switching device, the following formula needs to be satisfied:
the primary compensation network parameters can be calculated by the following formula:
Wherein: omega is the angular frequency and C 1 is the compensation capacitance.
In the double-load capacitive energy transmission system, the secondary side adopts an LCLC compensation circuit to generate constant current output in a load. The two load compensation circuits are identical in design, taking the compensation network of the first load as an example, and the design method is as follows:
R L is the load impedance, Z in6 is the equivalent input impedance of module 6, Z in5 is the equivalent input impedance of module 5, and Z in4 is the equivalent input impedance of module 4, i.e., the secondary equivalent impedances Z sec1.Zin6、Zin5 and Z in4 can be calculated as follows:
to obtain a resistive Z sec, the following formula needs to be satisfied:
the calculation formula of the secondary side compensation network parameters is as follows:
at this time, one load current is:
wherein Z CM12＝1/ωCM12.
Similarly, the other load current is calculated as follows:
Wherein Z CM13＝1/ωCM13.
From the above formula, the two load currents are constant, and independent operation control of the load power is realized regardless of the load resistance.
In order to verify the scheme provided by the patent, the double-load capacitive energy transmission system has the working frequency of 1MHz in the transmission system and the DC bus voltage of 30V. As shown in fig. 9, the two loads are R L1＝RL2 =100deg.OMEGA, respectively, and the peak value of the two load currents is I L1＝IL2 =0.42A. As shown in fig. 10, the load R L1 is reduced to 10Ω, and R L2 is 100deg.Ω, whereby it is possible to obtain two load currents with a peak value of 0.42A. As shown in fig. 11, the load R L2 is reduced to 10Ω, R L1 is 100deg.Ω, and the two load current peaks are 0.42A.
The verification can obtain the constant current output irrelevant to the load of the transmission system provided by the invention, the power crosstalk between two loads is avoided, the phase of the output voltage V 0 of the inverter is the same as that of the output current I 0, the zero-phase input is realized, and the transmission system is consistent with the design of a compensation circuit.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
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| CN102075208A (en) * | 2010-12-31 | 2011-05-25 | 东南大学 | Radio frequency front-end with low power consumption |
| CN113381515A (en) * | 2021-06-30 | 2021-09-10 | 东南大学 | Power decoupling multi-load electric field coupling type wireless power transmission system |
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| CN110350673A (en) * | 2019-07-12 | 2019-10-18 | 江南大学 | A kind of impedance matching network optimization method of radio energy transmission system under maximal efficiency tracking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102075208A (en) * | 2010-12-31 | 2011-05-25 | 东南大学 | Radio frequency front-end with low power consumption |
| CN113381515A (en) * | 2021-06-30 | 2021-09-10 | 东南大学 | Power decoupling multi-load electric field coupling type wireless power transmission system |
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