CN209860675U - Magnetic coupling resonant wireless power transmission system - Google Patents
Magnetic coupling resonant wireless power transmission system Download PDFInfo
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- CN209860675U CN209860675U CN201920758663.8U CN201920758663U CN209860675U CN 209860675 U CN209860675 U CN 209860675U CN 201920758663 U CN201920758663 U CN 201920758663U CN 209860675 U CN209860675 U CN 209860675U
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Abstract
The utility model relates to a magnetic coupling resonant mode wireless power transmission system, including dc-to-ac converter and transmission coil, the input of dc-to-ac converter is connected to DC power supply, the output is connected with transmission coil, a serial communication port, the dc-to-ac converter includes first switch tube, the second switch tube, first parallel electric capacity, second parallel electric capacity, first choke inductance, second choke inductance and resonant network, the one end of first switch tube is connected with resonant network's one end, and be connected to DC power supply through first choke inductance, the one end of second switch tube is connected with resonant network's the other end, and be connected to DC power supply through second choke inductance, first parallel electric capacity is parallelly connected with first switch tube, second parallel electric capacity is parallelly connected with the second switch tube, the other end of first switch tube is connected with the other end of second switch tube. Compared with the prior art, the utility model discloses to two inherent defects in E class dc-to-ac converter, power optimization promotion and soft switch work load width promotion have been carried out respectively.
Description
Technical Field
The utility model relates to a wireless power transmission system especially relates to a magnetic coupling resonant mode wireless power transmission system.
Background
With the rapid development of the society, the energy form of electric energy gradually becomes a medium for converting various energies, and electronic products such as intelligent wearing equipment such as various mobile phones and bracelets and household floor sweeping robots bring great convenience for daily living and traveling of people, but the traditional power transmission mode hinders the continuous usability of the products. At the present stage, the traditional power transmission mode still adopts metal wired power transmission, although the power transmission mode has been more developed in recent years (a mobile phone rapid charging technology and an extra-high voltage direct current power transmission technology), the contact type power transmission essence is not changed, and larger potential safety hazards still exist in some complex environments such as coal mines, underwater and the like; spark is easily generated between power transmission contact points due to aging and loss of wires to ignite the periphery, and great threat is generated to power transmission safety. In order to overcome the inherent defects of contact type power transmission, a novel wireless power transmission technology is developed.
The wireless power transmission can be divided into near-middle field power transmission and far-field power transmission according to the transmission distance. The near-middle field mainly adopts the conversion between electromagnetism, and the electricity is converted into the magnetic form by using a transmitting coil to be transmitted in the space; in the far field, space Transmission is performed by means of microwaves, and electricity is converted into microwaves by using a transmitting coil and transmitted in the space, wherein a Magnetic coupling resonance Power Transmission (MCRT-WPT) technology is a popular research in the field of Wireless Power Transmission because of taking both Transmission distance and Transmission efficiency into consideration. In the MCRT-WPT, in order to increase the power and efficiency of electric energy transmission, the system working frequency is generally modulated to MHz, the switching loss is greatly increased due to higher modulation frequency, and the class-E inverter is one of hot power supplies of the MCRT-WPT system in nearly two years due to simple structure and high output frequency and can work under the condition of soft switching.
However, at present, the problem of output power of a magnetic coupling resonant wireless power transmission system based on an E-class inverter under high transmission efficiency and the problem of efficiency reduction under dynamic load are not well solved. How to solve the above problems is an urgent need in the current class E inverter magnetic coupling resonant wireless power transmission technology.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide a magnetic coupling resonant wireless power transmission system.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a magnetic coupling resonant wireless power transmission system, includes dc-to-ac converter and transmission coil, the input of dc-to-ac converter is connected to DC power supply, and the output is connected with transmission coil, and the dc-to-ac converter includes first switch tube, second switch tube, first parallel capacitance, second parallel capacitance, first choke inductance, second choke inductance and resonant network, the one end of first switch tube is connected with resonant network's one end to be connected to DC power supply through first choke inductance, the one end of second switch tube is connected with resonant network's the other end to be connected to DC power supply through second choke inductance, first parallel capacitance is parallelly connected with first switch tube, second parallel capacitance is parallelly connected with the second switch tube, the other end of first switch tube is connected with the other end of second switch tube.
The first switch tube and the second switch tube are both MOSFET tubes, and the source electrodes of the first switch tube and the second switch tube are connected to a direct current power supply.
The resonant network comprises a resonant inductor and a resonant capacitor which are arranged in series.
And a load end parallel capacitor is also connected in series between the resonance inductor and the resonance capacitor.
The transmission coil comprises a transmitting circuit and a receiving circuit, the transmitting circuit is connected with a load end parallel capacitor in parallel, and the receiving circuit is connected with a load.
The transmitting circuit comprises a transmitting coil compensation capacitor and a transmitting coil.
One end of the transmitting coil compensation capacitor is connected with one end of the transmitting coil, the other end of the transmitting coil compensation capacitor is connected with one end of the load end parallel capacitor, and the other end of the transmitting coil compensation capacitor is connected with the other end of the load end parallel capacitor.
The receiving circuit comprises a receiving coil and a receiving coil compensation capacitor.
One end of the receiving coil compensation capacitor is connected with one end of the receiving coil, the other end of the receiving coil compensation capacitor is connected with one end of the load, and the other end of the receiving coil is connected with the other end of the load.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) under the condition of keeping the same frequency and input voltage of the system, because the two switching tubes share the direct-current bus voltage, the output voltage is improved by 2 times, and the output power is improved by 4 times in the same ratio
2) The switch-off tubes S1 and S2 are alternately conducted to output a sinusoidal voltage, and the voltages at two ends of each switch tube are reduced to zero before the switch-off tubes are conducted, so that the circuit can be ensured to be in a soft switch working state, and the switching loss of the two-way E-type inverter circuit is extremely low.
3) The impedance transformation method is adopted to reduce the variable range of the corresponding equivalent load real part when the actual load changes, and the load disturbance resistance of the system under high transmission efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a two-way class E inverter circuit;
FIG. 2 is a schematic diagram of the operating waveform of a two-way class E inverter circuit;
FIG. 3 is a schematic diagram of the principle of equivalent impedance transformation;
FIG. 4 is a graph illustrating the relationship between the load Req and the equivalent series load Rs for different parallel capacitors Cp;
FIG. 5 is a schematic diagram of a novel magnetic coupling resonant wireless power transmission circuit;
FIG. 6 is a schematic diagram of a single-tube class-E inverter circuit;
fig. 7 is a diagram showing simulation results of the novel magnetic coupling resonant wireless power transmission circuit.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Firstly, the inventor divides the MCRT-WPT system based on the E-type inverter into an inverter and a transmission coil, and respectively analyzes the efficiency and the load characteristics. The corresponding relation between the system load and the equivalent load of the inverter is researched emphatically, and the applicability and the defects of the class E inverter in MCRT-WPT are discussed.
Aiming at the problem that the overall output power of the system is limited due to the fact that the voltage-resistant grade of a switching tube of an inverter circuit is too small, as shown in figure 1, a circuit structure formed by two-way E-type inversion is adopted, the output power of MCRT-WPT can be effectively improved, and the working waveform of a two-way E-type inverter circuit is shown in figure 2.
The method aims at the problem that the load change can cause severe jitter and reduction of the wireless electric energy transmission efficiency in the power transmission process of the E-type inversion magnetic coupling resonant wireless power transmission system. The circuit structure of impedance conversion is provided, and the load range of the inverter under the soft switching work is effectively improved.
The MCRT-WPT system circuit structure capable of realizing full-load soft switching and improving output power is provided by comprehensively considering the two optimization designs.
A magnetic coupling resonant wireless power transmission system is provided, as shown in fig. 5, including an inverter and a transmission coil, an input end of the inverter is connected to a dc power supply, and an output end is connected to the transmission coil, the inverter includes a first switching tube, a second switching tube, a first parallel capacitor, a second parallel capacitor, a first choke inductor, a second choke inductor and a resonant network, one end of the first switching tube is connected to one end of the resonant network and is connected to the dc power supply through the first choke inductor, one end of the second switching tube is connected to the other end of the resonant network and is connected to the dc power supply through the second choke inductor, the first parallel capacitor is connected in parallel with the first switching tube, the second parallel capacitor is connected in parallel with the second switching tube, and the other end of the first switching tube is connected to the other end of the second switching tube.
The first switch tube and the second switch tube are both MOSFET tubes, and the source electrodes of the first switch tube and the second switch tube are connected to a direct current power supply.
The resonance network comprises a resonance inductor and a resonance capacitor which are arranged in series, and a load end parallel capacitor is also connected in series between the resonance inductor and the resonance capacitor.
The transmission coil comprises a transmitting circuit and a receiving circuit, the transmitting circuit is connected with the load end parallel capacitor in parallel, and the receiving circuit is connected with the load. The transmitting circuit comprises a transmitting coil compensation capacitor and a transmitting coil, one end of the transmitting coil compensation capacitor is connected with one end of the transmitting coil, the other end of the transmitting coil compensation capacitor is connected with one end of the load end parallel capacitor, and the other end of the transmitting coil is connected with the other end of the load end parallel capacitor. The receiving circuit comprises a receiving coil and a receiving coil compensation capacitor, one end of the receiving coil compensation capacitor is connected with one end of the receiving coil, the other end of the receiving coil compensation capacitor is connected with one end of the load, and the other end of the receiving coil is connected with the other end of the load.
The control method of the wireless power transmission system comprises the following steps: and the first switching tube and the second switching tube are alternately conducted according to a set frequency, so that a sine wave is output.
The improvement of the wireless power transmission system comprises:
1. aiming at the problem that the output power of a magnetic coupling resonant wireless power transmission system of an E-type inverter circuit is limited due to overlarge voltage stress of a switching tube, a circuit synthesis method is utilized for power improvement;
2. aiming at the problems that the soft switch fails to work and the system loss is increased due to load change of a magnetic coupling resonant wireless power transmission system of an E-type inverter circuit, the working load range of the soft switch is widened by adopting an impedance transformation method;
3. improvements are made in the output power of the inverter and soft-switching operating load range, respectively. The two improved circuits are integrated and parameter design is carried out. The MCRT-WPT circuit structure with wide load and high power under the condition of high-efficiency transmission is obtained.
For the point 1, the two-way E-type inverter is improved on the basis of the original E-type inverter. Compared with the traditional E-type inverter, under the condition that the system keeps the same frequency and the same input voltage, the output voltage is improved by 2 times and the output power is improved by 4 times in the same ratio because the two switching tubes share the direct-current bus voltage. The switching tubes S1 and S2 are alternatively conducted, and the double E-type inverter circuit can be regarded as the synthesis of two traditional single-tube E-type inverter circuits. The two filter inductors L1 and L2 and the two shunt capacitors C1 and C2 connected in parallel with the switching tubes continuously provide resonant current for the load. When each switching tube is conducted, the corresponding parallel capacitor is in short circuit, so that the circuit becomes a traditional single E-class inverter circuit, and the specific working principle is similar to that of a traditional E-class inverter. When the switch tube S1 is turned on and the switch tube S2 is turned off, the parallel capacitor corresponding to S1 is short-circuited, and when the switch tube S1 is turned off and the switch tube S2 is turned on, the parallel capacitor corresponding to S2 is short-circuited. The switch tubes S1 and S2 are alternately turned on to output a sinusoidal voltage. And before each switching tube is conducted, the voltage at the two ends of each switching tube is reduced to zero, so that the circuit can be ensured to be in a soft switching working state, and the switching loss of the two-way E-type inverter circuit is extremely low.
For the point 2, the inverter works in a soft switching working state only when the load is less than or equal to the optimal load real part resistance value aiming at the two-way E-type inverter. And the variable range of the corresponding equivalent load real part is reduced by adopting an impedance transformation method when the actual load changes. Obtaining a formula according to the impedance transformation principle:
wherein: ω is the resonance frequency, XcpIs a parallel capacitor, Xcp||ReqOf parallel capacitors and parallel resistors, ReqIs a parallel resistor, RsIs an equivalent series resistance, CsIs an equivalent series capacitance;
Xcpthe method specifically comprises the following steps:
wherein: cpIs a resistance ReqParallel capacitor of
At the resistance ReqCapacitor C with two parallel endspDerived and transformed to obtain the resistor R shown on the right side of the figure 3sAnd a capacitor CsCombination of series connection, at which the actual resistance R iss：
According to inequality maximum principle, equivalent series load RsIf and only if RP＝|XcpThe maximum value exists for |:
in different parallel capacitors CpLower, inverter load ReqWith equivalent series resistance RsThe relationship of (1). From FIG. 4, R can be foundeqIn the full load range, the equivalent series load RsVarying only in fixed intervals, by varying CpThe equivalent load R can be controlled by a numerical valuesThe range of variation.
And for the 3 rd point, aiming at two inherent defects of the class-E inverter, power optimization lifting and soft switching work load width lifting are respectively carried out. The improved power optimization lifting circuit and the soft switch working load width lifting circuit are organically integrated, an improved high-frequency power supply circuit suitable for the magnetic coupling resonant wireless power transmission system can be obtained, and the improved inverter circuit and the transmission coil part are integrated to obtain a novel circuit structure of the magnetic coupling resonant wireless power transmission system as shown in the attached figure 5.
The improved double-circuit E accumulation inverter circuit switching tubes S1 and S2 are alternately conducted, and the double-E inverter circuit can be regarded as the synthesis of two traditional single-tube E inverter circuits. In the following analysis, taking a single switch tube as an example, as shown in fig. 6, when the switch tube is turned on, the dc power completely flows through the switch tube via the choke inductor Lf, and the resonant network formed by C0-L0 is charged before the switch tube is turned on, so that the circuit outputs a sine wave. The current flowing through the switch tube is the sum of the currents flowing through the resonant network and the choke inductor, the resonant circuit is C0-L0-R, and the equivalent capacitor is Ceq＝C0The natural frequency of the resonant circuit is:
wherein: f. of1Is the natural frequency of the resonant circuit, L0Is a resonant network inductance, C0As a resonant network capacitor
When the switch tube is closed, because the two ends of the switch tube are provided with the capacitors C connected in parallelsSo that CsThe voltage on the inverter rises slowly, thereby greatly reducing the turn-off loss of the inverter. And during the turn-off period of the switching tube, the resonant network formed by C0-L0 and the parallel capacitor CsAnd the current is charged into the C0-L0 resonant network through a choke inductance Lf. When the capacitor C is connected in parallelsWhen the voltage drop is zero, the switching tube is conducted, and the charging of the C0-L0 resonant network is stopped, so that the switching loss of the inverter is greatly reduced, and the resonant network is C0-L0-R-Cs，
The natural frequency of the resonant circuit is:
the equivalent circuit is:
at this point, the class-E inverter completes one cycle and outputs a complete sine wave. In order to make the output sine waveform be symmetrical up and down, the duty ratio of the driving signal of the switching tube is generally 0.5, and as can be seen from the above analysis, the main element for determining whether the switch can work in the zero-voltage conduction state is the equivalent capacitor Ceq。
At this time, the formula of the class-E inverter parameters and efficiency is as follows:
switch tube parallel capacitor CsComprises the following steps:
equivalent inductance L of inverter resonant networkx：
Where ω is the resonance angular frequency, ReqIs an inverter equivalent load. The formula shows that the output part of the class E inverter is not pure resistance when the class E inverter works normally.
Known equivalent load ReqWhen the inverter has an efficiency of
Wherein:
when the system working angular frequency is omega, and the mutual inductance between the coils is M. ZsAnd ZrImpedance of the transmitting coil respectivelyAnd impedance of the receiving coilCoupling factor δ (ω M)2. Transmission coil part equivalent impedance is Zeq：
When the transmitting coil part and the receiving coil part resonate simultaneously, the reflection impedance of the two coil loops is minimum, and the impedance of the transmitting coil part is only pure resistance value, namely Zr＝R2+R、Zs＝R1. At the moment, the equivalent impedance is simplified into
In magnetic coupling resonance type wireless power transmission, in order to ensure that a transmitting coil and a receiving coil have the same natural frequency, the parameter design is consistent, so that the coils have the same parasitic resistance R at high frequency1And R2。
Wherein σ is the electrical conductivity; n is the number of coil turns; b is the wire radius; r is the coil radius; μ is the vacuum permeability. When the coil is designed, the parameter in the formula is divided into omega which is a fixed value, delta is equal to (omega M)2Substituting the formula to obtain:
simultaneous solution yields:
at the resistance ReqCapacitor C with two parallel endspThe derived transformation can obtain the resistance R as shown on the right side of FIG. 3sAnd a capacitor CsCombination of series connection, at which the actual resistance R iss：
The two formulas are combined, and the load R and the equivalent series load R of the inverter are connected at the momentsThe relation equation between the two is as follows:
the maximum equivalent series resistance at this time is:
under the condition of knowing the parameters of the original resistance value of the load and the coupling factor of the coil, substituting the maximum series equivalent resistance value obtained according to the formula into an inverter parameter design formula (R)eq＝Rs) And calculating and obtaining the inductance and capacitance parameters of the two-way E-type inverter.
The switching tube parallel capacitance calculation formula is as follows:
the two-way E-type inverter circuit resonant network Lr and Cr are connected with an equivalent inductor Lx in series:
MATLAB/Simulink software is adopted in the experiment, and the input direct current voltage U is setdcThe voltage is 200V, the switching tubes S1 and S2 are alternately conducted, the trigger pulse frequency is 6.5MHz, and the MCRT-WPT initial load R is 20 omega. Other relevant parameters, simulation results are shown in fig. 7, and are calculated as shown in table 1:
TABLE 1
| Parameter(s) | Numerical value |
| Vdc/v | 200 |
| L1,L2/uH | 350 |
| C1,C2/nF | 36.0 |
| Lr/uH | 35.8 |
| Cr/nF | 25.0 |
| Cp/nF | 32.0 |
| L3，L4/uH | 105 |
| C3,C4/nF | 6.03 |
Claims (9)
1. The magnetic coupling resonant wireless power transmission system is characterized in that the inverter comprises a first switch tube, a second switch tube, a first parallel capacitor, a second parallel capacitor, a first choking inductor, a second choking inductor and a resonant network, one end of the first switch tube is connected with one end of the resonant network and is connected to the direct-current power supply through the first choking inductor, one end of the second switch tube is connected with the other end of the resonant network and is connected to the direct-current power supply through the second choking inductor, the first parallel capacitor is connected with the first switch tube in parallel, the second parallel capacitor is connected with the second switch tube in parallel, and the other end of the first switch tube is connected with the other end of the second switch tube.
2. A magnetic coupling resonant wireless power transmission system according to claim 1, wherein the first and second switching tubes are MOSFET tubes, and the sources thereof are connected to a dc power supply.
3. A magnetically coupled resonant wireless power transmission system according to claim 1, wherein the resonant network comprises a resonant inductor and a resonant capacitor arranged in series.
4. A magnetic coupling resonant wireless power transmission system according to claim 3, wherein a load side parallel capacitor is further connected in series between the resonant inductor and the resonant capacitor.
5. A magnetic coupling resonant wireless power transmission system according to claim 4, wherein the transmission coil comprises a transmission circuit and a receiving circuit, the transmission circuit is connected in parallel with a load side parallel capacitor, and the receiving circuit is connected with a load.
6. A magnetically coupled resonant wireless power transmission system according to claim 5, wherein the transmit circuit comprises a transmit coil compensation capacitor and a transmit coil.
7. A magnetic coupling resonant wireless power transmission system according to claim 6, wherein one end of the compensation capacitor of the transmitting coil is connected to one end of the transmitting coil, the other end of the compensation capacitor of the transmitting coil is connected to one end of the parallel capacitor of the load terminal, and the other end of the compensating capacitor of the transmitting coil is connected to the other end of the parallel capacitor of the load terminal.
8. A magnetically coupled resonant wireless power transmission system according to claim 5, wherein the receive circuit comprises a receive coil and a receive coil compensation capacitor.
9. A magnetically coupled resonant wireless power transmission system according to claim 8, wherein the compensation capacitor of the receiving coil has one end connected to one end of the receiving coil and the other end connected to one end of the load, and the other end of the receiving coil is connected to the other end of the load.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112836A (en) * | 2019-05-24 | 2019-08-09 | 上海电力学院 | A kind of magnet coupled resonant type wireless transmission system and control method |
| CN115276260A (en) * | 2022-09-22 | 2022-11-01 | 国网浙江慈溪市供电有限公司 | ICPT system and non-contact power supply system of electric automobile |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112836A (en) * | 2019-05-24 | 2019-08-09 | 上海电力学院 | A kind of magnet coupled resonant type wireless transmission system and control method |
| CN115276260A (en) * | 2022-09-22 | 2022-11-01 | 国网浙江慈溪市供电有限公司 | ICPT system and non-contact power supply system of electric automobile |
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