CN111490604A - Random constant-voltage wireless power transmission compensation network and method based on relay coil - Google Patents
Random constant-voltage wireless power transmission compensation network and method based on relay coil Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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
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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
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Abstract
The invention relates to an arbitrary constant-voltage wireless power transmission compensation network and a compensation method based on a relay coil. The random constant-voltage wireless power transmission compensation network with the relay coil comprises a transmitting coil loop, a relay coil loop and a receiving coil loop, wherein the transmitting coil loop comprises a voltage source, a transmitting coil and a transmitting coil loop compensation capacitor which are connected in series, the relay coil loop comprises a relay coil and a relay coil loop compensation capacitor which are connected in series, and the receiving coil loop comprises a receiving coil, a receiving coil loop series compensation capacitor, a receiving coil loop parallel compensation capacitor and a load. The invention adds the parallel compensation capacitor on the basis of keeping the original compensation network structure, and enables the system to obtain the constant voltage output characteristics of different levels and effectively reduces the capacity of the inverter through the design of the compensation parameter, and the detuning problem is not easy to occur compared with the traditional three-coil structure.
Description
Technical Field
The invention relates to an arbitrary constant-voltage wireless power transmission compensation network and a compensation method based on a relay coil.
Background
With the rapid development of the electric automobile industry, people put higher demands on the safety and convenience of a charging system. Therefore, the contactless charging system for the electric vehicle is also increasingly widely used. When the transmission distance increases, the transmission efficiency of the wireless power transmission system rapidly decreases. To solve the problem, inserting a relay coil between the transmitting coil and the receiving coil is a simple, easy, economical and effective way to increase the wireless energy transmission distance.
The existence of the relay coil plays a role of an energy transfer station, but the system has a plurality of power transmission paths, so that the design of a compensation network of the system is complicated, and better output characteristics are difficult to obtain.
At present, the existing compensation method is to control the resonance frequency of each coil self-inductance and the compensation capacitor to be consistent, so as to improve the energy transmission capability of the system. However, in such a compensation method, first, the output characteristic of the load is determined by the entire magnetic coupling system, and the internal reactance of the system cannot be completely compensated, so that the output voltage stabilization characteristic is poor. Second, in applications where there are three resonant frequencies in a magnetic coupling system with a relay coil, the problem of detuning the compensation network is more likely to occur than in a two-coil system without a relay coil. Thirdly, the magnetic coupling system with the relay coil has the cross coupling problem, and the influence of the cross coupling effect is eliminated by adding an impedance matching network or a series reactance compensation mode on the basis of the resonance compensation network of each coil in the prior art. However, such compensation method requires an increased number of devices, and the magnetic coupling system is completely determined once its output characteristics are given, and different output characteristics cannot be obtained by designing the compensation network parameters. The invention provides a compensation network structure of a three-coil magnetic coupling system with a relay coil and a parameter determination method aiming at the problems of cross coupling and detuning in a three-coil wireless electric energy transmission system. In the method, the relay coil does not work in a resonance state, and the system only has two resonance links, so that the detuning problem is not easy to occur compared with the traditional three-coil structure. Meanwhile, the method comprehensively considers the problem of cross coupling, so that the system is completely compensated, and good output characteristics are obtained.
The existing major compensation network topologies are as follows:
1. series capacitance compensation of transmitting, relaying and receiving coils
By using series capacitance compensation in each coil, the resonant angular frequency of each coil loop is controlled at the same angular frequency, i.e.
The compensation topology is shown in FIG. 1, wherein L1For self-inductance of the transmitting coil, LrFor relay coil self-inductance, L2For self-inductance of the receiving coil, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, C1Compensating the capacitance for the transmitting coil loop, CrCompensating the capacitance for the relay coil loop, C2The capacitance is compensated for the receive coil loop.
From the compensated topology, the KV L equations for the three loops are listed as follows:
the output characteristics are as follows:
from its output characteristic expression, it is not difficult to find that the output voltage of the load is difficult to control, and also related to the coupling parameter, the cross-coupling effect is not eliminated. On the basis of series capacitance resonance compensation of transmitting, relaying and receiving coils, an impedance matching network or series reactance compensation is added, as shown in fig. 2-5, so as to eliminate the influence of cross coupling and reduce reactive power.
In summary, the conventional compensation method is to control the resonance frequency of each coil self-inductance to be consistent with the resonance frequency of the compensation capacitor, so as to improve the energy transmission capability of the system. However, in such a compensation method, first, the output characteristic of the load is determined by the entire magnetic coupling system, and the internal reactance of the system cannot be completely compensated, so that the output voltage stabilization characteristic is poor. Second, in applications where there are three resonant frequencies in a magnetic coupling system with a relay coil, the problem of detuning the compensation network is more likely to occur than in a two-coil system without a relay coil. Thirdly, the magnetic coupling system with the relay coil has the cross coupling problem, and the influence of the cross coupling effect is eliminated by adding an impedance matching network or a series reactance compensation mode on the basis of the resonance compensation network of each coil in the prior art. However, such compensation method requires an increased number of devices, and the magnetic coupling system is completely determined once its output characteristics are given, and different output characteristics cannot be obtained by designing the compensation network parameters.
Disclosure of Invention
The invention aims to provide an arbitrary constant-voltage wireless power transmission compensation network based on a relay coil and a compensation parameter determination method, so that the relay coil does not work in a resonance state, a system only has two resonance links, the detuning problem is not easy to occur compared with the traditional three-coil structure, the system can obtain constant-current output characteristics of different levels through the design of the compensation parameters, and the capacity of an inverter is effectively reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows: an arbitrary constant-voltage wireless power transmission compensation method based on a relay coil obtains output constant-voltage characteristics of different levels through a parameter determination method on the basis of an original compensation network, and specifically comprises the following steps:
step A1: the three-coil mutual inductance model is equivalent to a transformer T model, and comprises a transmitting coil loop, a relay coil loop and a receiving coil loop;
step A2: transmitting coil loop compensation capacitor Cs1Equivalent leakage inductance L of primary side in transformer T modelpkVoltage source U of series resonance, transmitting coil loopinThe amplification is carried out by n times through a transformer,the method is applied to a secondary side of a transformer T model, n is an equivalent transformation ratio of the transformer T model, the transformation ratio is different from a physical turn ratio of the transformer, and theoretically, the transformation ratio can be any value including a real number and a complex number;
step A3: receiving coil loop compensation capacitor Cs2Equivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, nUinThe constant voltage output is realized by applying the constant voltage output to a load positioned in a receiving coil loop, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step A4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor can be replaced by a short circuit line;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor can be replaced by a short circuit.
The invention also provides an arbitrary constant voltage wireless power transmission compensation network based on the relay coil, which comprises a transmitting coil loop, a relay coil loop and a receiving coil loop, wherein the transmitting coil loop comprises a voltage source, a transmitting coil and a transmitting coil loop compensation capacitor which are connected in series, the relay coil loop comprises a relay coil and a relay coil loop compensation capacitor which are connected in series, the receiving coil loop comprises a receiving coil, a receiving coil loop series compensation capacitor, a receiving coil loop parallel compensation capacitor and a load, one end of the receiving coil is connected with one end of the receiving coil loop parallel compensation capacitor and one end of the load through the receiving coil loop series compensation capacitor, and the other end of the receiving coil is connected with the other end of the receiving coil loop parallel compensation capacitor and the other end of the load.
The invention also provides an arbitrary constant voltage wireless power transmission compensation method based on the relay coil, and output constant voltage characteristics of different levels are obtained by a parameter determination method based on the arbitrary constant voltage wireless power transmission compensation network based on the relay coil, which is specifically as follows:
step B1: the three-coil mutual inductance model is equivalent to a transformer T model;
step B2: transmitting coil loop compensation capacitor Cs1Equivalent leakage inductance L of primary side in transformer T modelpkSeries resonant, voltage source UinAmplifying n times by using a transformer, and applying the amplified value to a secondary side of a transformer T model, wherein n is an equivalent transformation ratio of the transformer T model, the transformation ratio is different from a physical turn ratio of the transformer, and can be any value theoretically, including real numbers and complex numbers;
step B3: receiving coil loop series compensation capacitor Cs2Equivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, receiving coil loop parallel compensation capacitor CpEquivalent excitation inductance L with transformer T modelmParallel resonance reactive power reduction, nUinThe constant voltage output is realized by applying the constant voltage output on a load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2As a trunk lineMutual inductance between the turns and the receiving coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step B4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor can be replaced by a short circuit line;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor can be replaced by a short circuit.
The invention also provides another random constant-voltage wireless power transmission compensation network based on the relay coil, which comprises a transmitting coil loop, a relay coil loop and a receiving coil loop, wherein the transmitting coil loop comprises a current source, a transmitting coil compensation capacitor and a transmitting coil which are connected in parallel, the relay coil loop comprises the relay coil and the relay coil loop compensation capacitor which are connected in series, and the receiving coil loop comprises the receiving coil, the receiving coil loop series compensation capacitor and a load which are connected in series.
The invention also provides a relay coil-based arbitrary constant voltage wireless power transmission compensation method, which is based on the above-mentioned relay coil-based arbitrary constant voltage wireless power transmission compensation method and is characterized in that on the basis of the relay coil-based arbitrary constant voltage wireless power transmission compensation network of claim 2, output constant voltage characteristics of different levels are obtained by a parameter determination method, specifically as follows:
step C1: the three-coil mutual inductance model is equivalent to a transformer T model;
step C2: through equivalent source transformation, the current source is equivalent to the voltage source
Transmitting coil compensation capacitor CpEquivalent leakage inductance L of primary side in transformer T modelpkSeries resonant, equivalent back voltage source
Amplified by n times through the transformer, applied to the secondary side of the transformer T model LpkAnd LskThe equivalent leakage inductance of the primary side and the secondary side in the transformer T model are respectively, n is the equivalent transformation ratio of the transformer T model, the transformation ratio is different from the physical turn ratio of the transformer, and theoretically can be any value including real number and complex number;
step C3: receiving coil loop series compensation capacitor CsEquivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, equivalent source
The constant voltage output is realized by applying the constant voltage output on a load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step C4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presentsAt infinity, i.e.
The Cs capacitor can be replaced by a short circuit line。
In an embodiment of the present invention, if the calculated capacitance value has a negative value, the capacitance value is compensated by an inductance, and the relationship between the compensation inductance value and the negative compensation capacitance value is shown as follows:
compared with the prior art, the invention has the following beneficial effects:
1. the relay coil does not work in a resonance state, and the system only has two resonance links, so that the detuning problem is not easy to occur compared with the traditional three-coil structure;
2. the invention comprehensively considers the problem of cross coupling, and makes the system completely compensate, thereby obtaining good output characteristics;
3. the invention enables the system to obtain constant voltage output characteristics of different levels and effectively reduces the capacity of the inverter through the design of the compensation parameters.
Drawings
Fig. 1 is a compensation topology for series capacitance resonance of coils.
Figure 2 is a compensation topology with the addition of series reactance.
Figure 3 is a compensation topology with the addition of a type I impedance matching network.
Fig. 4 is a compensation topology with the addition of a pi-type impedance matching network.
Fig. 5 is a compensation topology with the addition of a T-type impedance matching network.
FIG. 6 is a three coil mutual inductance model.
Fig. 7 is a transformer T model.
Figure 8 is a prior art SSS compensation network architecture.
Fig. 9 is an SS compensation network architecture 1 of the present invention.
Fig. 10 is an SS compensation network architecture 2 of the present invention.
Fig. 11 is a SSSP compensation network structure of the present invention.
Figure 12 is the SSP compensation network configuration 1 of the present invention.
Figure 13 is the SSP compensation network configuration 2 of the present invention.
Fig. 14 is a PSS compensation network structure of the present invention.
Fig. 15 is a PS compensation network structure of the present invention.
FIG. 16 shows simulation results of the first embodiment of the present invention.
FIG. 17 shows simulation results of the second embodiment of the present invention.
FIG. 18 shows simulation results of the third embodiment of the present invention.
FIG. 19 is a flow chart of the method of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
As shown in fig. 11, the present invention provides an arbitrary constant voltage wireless power transmission compensation network based on a relay coil, and adds a parallel compensation capacitor on the basis of maintaining the original compensation network structure, so that the system obtains constant voltage output characteristics of different levels and reduces the capacity of an inverter; the transmitting coil loop comprises a voltage source, a transmitting coil and a transmitting coil loop compensation capacitor which are connected in series, the relay coil loop comprises a relay coil and a relay coil loop compensation capacitor which are connected in series, the receiving coil loop comprises a receiving coil, a receiving coil loop series compensation capacitor, a receiving coil loop parallel compensation capacitor and a load, one end of the receiving coil is connected with one end of the receiving coil loop parallel compensation capacitor and one end of the load through the receiving coil loop series compensation capacitor, and the other end of the receiving coil is connected with the other end of the receiving coil loop parallel compensation capacitor and the other end of the load.
As shown in fig. 14, the present invention provides an arbitrary constant voltage wireless power transmission compensation network based on a relay coil, which includes a transmitting coil loop, a relay coil loop, and a receiving coil loop, where the transmitting coil loop includes a current source, a transmitting coil compensation capacitor, and a transmitting coil connected in parallel, the relay coil loop includes a relay coil and a relay coil loop compensation capacitor connected in series, and the receiving coil loop includes a receiving coil, a receiving coil loop compensation capacitor, and a load connected in series.
In this embodiment, based on the two-port characteristics, the original multi-stage and complex mutual inductance model of the three coils is equivalent to a simple and clear transformer T model, and an equivalent circuit model of the transformer T model is shown in fig. 7.
From KV L, the loop voltage equations are listed:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrFor compensating the capacitance of the relay coil loop, omega is the angular frequency of system operation, different from omega0。
The matrix expression is also derived:
Lpkand LskRespectively equivalent leakage inductance of a primary side and a secondary side in a transformer T model, and n is an equivalent transformation ratio of the transformer T model, which is different from a physical turn ratio of the transformer and can be any value (including real number and complex number) in theory LmThe equivalent excitation inductance of the transformer T model.
To ensure that the characteristics of the two ports are the same, the relationship between each parameter in the transformer T model and each parameter in the mutual inductance model can be obtained as follows:
L1，L2，Lr，M1r，Mr2，M12all can be obtained by actual measurement, and the relay coil compensates the capacitor CrIs selected not to be equal to
(ω0Representing the natural angular frequency of resonance), i.e. the relay coil is in a detuned condition. According to the expression, the magnetic coupling structure and the compensation capacitor C of the wireless power transmission systemrFixation of value, Lm，Lpk，LskCan be determined by different n. And placing the equivalent transformer T model in a wireless power transmission system. The equivalent transformer T model is an equivalent method based on the detuning condition of the relay coil, not only integrates the cross coupling into the equivalent model to realize the decoupling of the relay coil, but also provides a new way for eliminating the cross coupling.
In the embodiment of the present invention, as shown in fig. 8, a parameter determination method for a compensation network structure based on an original three-coil magnetic coupling system includes the following steps:
step A1: the three-coil mutual inductance model is equivalent to a transformer T model;
step A2: cs1And LpkSeries resonant, voltage source UinAmplified by n times by transformer, applied to secondary side, LpkAnd LskRespectively equivalent leakage inductance of a primary side and a secondary side in a transformer T model, and n is an equivalent transformation ratio of the transformer T model (the transformation ratio is different from a physical turn ratio of the transformer and can be any value in theory, including real numbers and complex numbers);
step A3: cs2And LskSeries resonance, nUinThe constant voltage output is realized by applying the constant voltage output on an output load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step A4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor can be replaced by a short circuit line, as shown in fig. 9;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor may be replaced by a short circuit line as shown in fig. 10.
In the embodiment of the present invention, a parameter determination method for a compensation network structure based on a three-coil magnetic coupling system as shown in fig. 11 includes the following steps:
step B1: the three-coil mutual inductance model is equivalent to a transformer T model;
step B2: cs1And LpkSeries resonant, voltage source UinAmplified by n times by transformer, applied to secondary side, LpkAnd LskEquivalent leakage inductances of the primary side and the secondary side in the transformer T model, L respectivelymThe equivalent excitation inductance of the transformer T model is obtained, and n is the equivalent transformation ratio of the transformer T model (the transformation ratio is different from the physical turn ratio of the transformer and can be any value in theory, including real numbers and complex numbers);
step B3: cs2And LskSeries resonance, CpAnd LmParallel resonance reactive power reduction, nUinThe constant voltage output is realized by applying the constant voltage output on an output load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step B4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor may be replaced by a short-circuited line, as shown in fig. 12;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor may be replaced by a short circuit line as shown in fig. 13.
In the embodiment of the present invention, a parameter determination method for a compensation network structure based on a three-coil magnetic coupling system as shown in fig. 14 includes the following steps:
step C1: the three-coil mutual inductance model is equivalent to a transformer T model;
step C2: through equivalent source transformation, the current source is equivalent to the voltage source
CpAnd LpkSeries resonant, equivalent back voltage source
Amplified by n times by transformer, applied to secondary side, LpkAnd LskRespectively equivalent leakage inductance of a primary side and a secondary side in a transformer T model, and n is an equivalent transformation ratio of the transformer T model (the transformation ratio is different from a physical turn ratio of the transformer and can be any value in theory, including real numbers and complex numbers);
step C3: csAnd LskSeries resonance, equivalent source
The constant voltage output is realized by applying the constant voltage output on an output load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step C4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presentsAt infinity, i.e.
At this time CsThe capacitor may be replaced by a short circuit line as shown in fig. 15.
In this embodiment, if the required capacitance value is calculated to have a negative value, the capacitance is compensated by the inductance, and the relationship between the compensation inductance value and the negative compensation capacitance value is shown as the following formula:
referring to fig. 8, an embodiment of the present invention:
for a three-coil wireless power transmission system working at the frequency of 100kHz, the self-inductance of a transmitting coil of a magnetic coupling structure is 240uH, the self-inductance of a relay coil is 200uH, and the self-inductance of a pickup coil is 100uH and K1r＝0.11，Kr2＝0.285，K120.053, relay coil resonance capacitance CrSelecting
The detuning condition of the relay coil is characterized, the amplitude of an inversion input source connected with a transmitting coil is 100V, and the compensation mode is as follows:
when the required output amplitude is 100V, namely the transformation ratio n is 1, C is calculated by using the formulas1And Cs2At this time Cs1＝11.82nF，Cs2At this time, the output side can achieve the effect of outputting 100V at constant voltage, and the simulation result is shown in fig. 16;
when the required output amplitude is 150V, namely the transformation ratio n is 1.5, C is calculated by using the formulas1And Cs2At this time Cs1＝10.94nF， Cs2At 26.6nF, the output side can achieve the effect of outputting 150V at constant voltage, and the simulation result is shown in fig. 17;
when the required output amplitude is 400V, namely the transformation ratio n is 4, C is calculated by using the formulas1And Cs2At this time Cs1＝10.0nF， Cs2Negative at-72.99 nF, using formula, inductor L is selecteds234.70uH instead of Cs2At this time, the output side can achieve the effect of outputting 400V at a constant voltage, and the simulation result is shown in fig. 18.
FIG. 19 is an overall flow chart of the method of the present invention.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides an arbitrary constant voltage wireless power transmission compensation network based on relay coil, its characterized in that, includes transmitting coil return circuit, relay coil return circuit, receiving coil return circuit, the transmitting coil return circuit includes series connection's voltage source, transmitting coil return circuit compensation capacitance, the relay coil return circuit includes series connection's relay coil, relay coil return circuit compensation capacitance, the receiving coil return circuit includes receiving coil, receiving coil return circuit series compensation capacitance, the parallelly connected compensation capacitance in receiving coil return circuit, load, the one end of receiving coil is connected through the one end of receiving coil return circuit series compensation capacitance and the parallelly connected compensation capacitance in receiving coil return circuit, the one end of load, and the other end of receiving coil's the other end and the other end of the parallelly connected compensation capacitance in receiving coil return circuit, the other end of load are connected.
2. The utility model provides an arbitrary constant voltage wireless power transmission compensation network based on relay coil, its characterized in that, includes transmitting coil return circuit, relay coil return circuit, receiving coil return circuit, the transmitting coil return circuit includes parallel connection's current source, transmitting coil compensation capacitance, transmitting coil, the relay coil return circuit includes series connection's relay coil, relay coil return circuit compensation capacitance, the receiving coil return circuit includes series connection's receiving coil, receiving coil return circuit series compensation capacitance, load.
3. An arbitrary constant voltage wireless power transmission compensation method based on a relay coil is characterized in that on the basis of the compensation network of claim 2, output constant voltage characteristics of different levels are obtained through a parameter determination method, and the method comprises the following specific steps:
step A1: the three-coil mutual inductance model is equivalent to a transformer T model, and comprises a transmitting coil loop, a relay coil loop and a receiving coil loop;
step A2: transmitting coil loop compensation capacitor Cs1Equivalent leakage inductance L of primary side in transformer T modelpkVoltage source U of series resonance, transmitting coil loopinAmplifying by n times through a transformer, applying the amplified signal to a secondary side of a transformer T model, wherein n is equivalent variation of the transformer T modelThe ratio, which is different from the physical turn ratio of the transformer, can be theoretically any value, including real and complex;
step A3: receiving coil loop compensation capacitor Cs2Equivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, nUinThe constant voltage output is realized by applying the constant voltage output to a load positioned in a receiving coil loop, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step A4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor can be replaced by a short circuit line;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor can be replaced by a short circuit.
4. An arbitrary constant voltage wireless power transmission compensation method based on a relay coil is characterized in that on the basis of the arbitrary constant voltage wireless power transmission compensation network based on the relay coil in claim 1, output constant voltage characteristics of different levels are obtained through a parameter determination method, and the method specifically comprises the following steps:
step B1: the three-coil mutual inductance model is equivalent to a transformer T model;
step B2: transmitting coil loop compensation capacitor Cs1Equivalent leakage inductance L of primary side in transformer T modelpkSeries resonant, voltage source UinAmplifying n times by using a transformer, and applying the amplified value to a secondary side of a transformer T model, wherein n is an equivalent transformation ratio of the transformer T model, the transformation ratio is different from a physical turn ratio of the transformer, and can be any value theoretically, including real numbers and complex numbers;
step B3: receiving coil loop series compensation capacitor Cs2Equivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, receiving coil loop parallel compensation capacitor CpEquivalent excitation inductance L with transformer T modelmParallel resonance reactive power reduction, nUinThe constant voltage output is realized by applying the constant voltage output on a load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step B4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presents1At infinity, i.e.
At this time Cs1The capacitor can be replaced by a short circuit line;
when C is presents2At infinity, i.e.
At this time Cs2The capacitor can be replaced by a short circuit.
5. An arbitrary constant voltage wireless power transmission compensation method based on a relay coil is characterized in that on the basis of the arbitrary constant voltage wireless power transmission compensation network based on the relay coil in claim 2, output constant voltage characteristics of different levels are obtained through a parameter determination method, and the method specifically comprises the following steps:
step C1: the three-coil mutual inductance model is equivalent to a transformer T model;
step C2: through equivalent source transformation, the current source is equivalent to the voltage source
Transmitting coil compensation capacitor CpEquivalent leakage inductance L of primary side in transformer T modelpkSeries resonant, equivalent back voltage source
Amplified by n times through the transformer, applied to the secondary side of the transformer T model LpkAnd LskThe equivalent leakage inductance of the primary side and the secondary side in the transformer T model are respectively, n is the equivalent transformation ratio of the transformer T model, the transformation ratio is different from the physical turn ratio of the transformer, and theoretically can be any value including real number and complex number;
step C3: receiving coil loop series compensation capacitor CsEquivalent leakage inductance L of secondary side in transformer T modelskSeries resonance, equivalent source
The constant voltage output is realized by applying the constant voltage output on a load, and the parameters are determined as follows:
l therein1，Lr，L2Respectively a transmitting coil self-inductance, a relay coil self-inductance and a receiving coil self-inductance, M1rFor mutual inductance between transmitter coil and relay coil, Mr2For mutual inductance between the relay coil and the receiver coil, M12For mutual inductance between transmitter coil and receiver coil, CrCompensating capacitance for a relay coil loop, wherein omega is the working angular frequency of the system;
step C4: according to the output current URLThe size, namely the value of n is determined, and the required capacitance value is further determined, so that the required voltage gain is realized and the change of the voltage gain is avoided;
when C is presentsAt infinity, i.e.
The Cs capacitance can now be replaced by a short-circuited line.
6. Parameter determination method of a compensation network structure based on a three-coil magnetic coupling system according to any of claims 3 to 5, characterized in that: if the required capacitance value is calculated to have a negative value, the capacitance value is compensated by using the inductance, and the relationship between the compensation inductance value and the negative compensation capacitance value is shown as the following formula:
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