CN113794288A - Wireless power transmission compensation topological structure with double parallel inductors - Google Patents
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- 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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Abstract
The invention discloses a wireless power transmission compensation topological structure with double parallel inductors, which comprises a direct-current power supply, an inverter circuit, a primary side compensation circuit, a transformer, a secondary side compensation circuit, a rectifying circuit and a load, wherein the primary side compensation circuit is connected with the alternating current side of the inverter circuit and is provided with two branches, one branch is formed by connecting a primary side compensation capacitor and a primary side transmitting coil in series, the other branch is formed by connecting a parallel compensation inductor or connecting the parallel compensation inductor and a DC blocking capacitor in series, the secondary side compensation circuit is connected with the alternating current side of the rectifying circuit and is symmetrically provided with two branches, one branch is formed by connecting a secondary side compensation capacitor and a secondary side receiving coil in series, and the other branch is formed by connecting the parallel compensation inductor in parallel. The wireless power transmission compensation topological structure of the parallel inductor provided by the invention can eliminate the reactive power at the input side of the compensation circuit under the constant voltage load by designing and controlling the frequency of the compensation parameter, has stronger anti-offset capability, has the capability of regulating the output power in a large range and realizes the soft switching of the inverter.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a wireless power transmission compensation topological structure with double parallel inductors.
Background
The wireless power transmission technology can transmit energy in a non-contact manner, and has the outstanding advantages of convenience, safety, low maintenance cost, adaptability to severe weather and the like. The inductive wireless power transmission technology transmits power through electromagnetic coupling by a loose coupling transformer composed of two coils, and because the loose coupling transformer has larger leakage inductance, a compensation network is often required to be added between an original secondary coil and a converter so as to reduce the reactive power of a circuit and improve the power factor of an alternating current side of an inverter circuit, thereby improving the efficiency.
The currently common compensation modes in wireless power transmission comprise four basic compensation topologies of S/S, S/P, P/S, P/P and novel compensation topologies of SP/S, S/SP, LCL, LCC, CLC and the like; however, the primary side of the P/S, P/P, SP/S type compensation topology needs to use a current type inverter, and the structure is not suitable for the current mainstream full-bridge voltage inversion scheme; in S/P and S/SP type compensation topologies, because the alternating current side of the rectifier is directly connected with a capacitor in parallel, a filter network with a large inductor is often required to be used between the direct current side of the rectifier and a load; under the traditional resonant design of the LCL compensation topology, the compensation inductor and the coil inductor have the same inductance, which can increase the loss of the system; the LCC compensation topology is an improvement of the LCL compensation topology, but the LCC compensation topology has the problem of more compensation elements.
In the prior art, there is also a wireless power transmission system compensation topology structure disclosed in chinese patent with publication number CN106533185B, which includes a dc input voltage source, a full-bridge inverter, an S/CLC compensation topology, a full-wave rectifier, a filter inductor, a filter capacitor, and a load resistor; the S/CLC compensation topology comprises a primary side series compensation capacitor, a loose coupling transformer, a secondary side parallel compensation capacitor, a secondary side series compensation inductor and a phase-shifting capacitor. Although the above patent solves the problem of more bilateral LCC compensation topology elements, it does not have offset fault tolerance capability; in fact, most of the existing analysis and design methods for compensating topologies are based on fixed frequency, so as to obtain constant voltage or constant current output independent of load, but none of the topologies has offset fault tolerance capability.
In the wireless power transmission technology, the deviation is often unavoidable, and even in some fixed position charging occasions, the coupling coefficient of the loose coupling transformer can be changed due to the installation precision. S/S compensation in the basic compensation topology may even be dangerous because of the rise in primary current due to the reduction in mutual inductance. In order to solve the problem, researchers provide a detuning design method for S/S compensation and a primary side T-shaped compensation network, and under the conditions of constant voltage load and offset, the characteristic that a power curve is increased before decreased can be obtained, so that the output power is only changed by 20% under the condition that about two times of coupling coefficients are changed. The method is further researched on S/SP topology and the like to expand the load range, so that the output close to constant voltage is realized under the condition that the coupling coefficient and the load are changed. Although the offset fault-tolerant capability is improved and the wide load range is realized by using the method, the power factor of the alternating current side of the inverter is reduced, the input impedance angle is enlarged, and a large amount of reactive power is introduced into the input side of the compensation circuit. The generation of reactive power has a great influence on the efficiency of the system and places higher demands on the selection of the capacity of the switching devices.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a wireless power transmission compensation topological structure with double parallel inductors, which has stronger anti-offset capability, can change the load in a wide range, can eliminate reactive power at the input side of a compensation circuit and can realize soft switching.
A wireless power transmission compensation topological structure with double parallel inductors comprises a direct current power supply, an inverter circuit, a primary side compensation network, a primary side transmitting coil, a secondary side receiving coil, a secondary side compensation network, a rectifying circuit and a load which are electrically connected in sequence,
the primary side compensation network comprises a primary side parallel compensation inductor and a primary side series compensation capacitor;
the secondary side compensation network comprises a secondary side parallel compensation inductor and a secondary side series compensation capacitor;
the direct-current power supply is electrically connected with the direct-current side of the inverter circuit, and two ends of the alternating-current side of the inverter current are respectively electrically connected with two ends of the primary side parallel compensation inductor;
one end of the primary side series compensation capacitor is electrically connected with one end of the primary side parallel compensation inductor, the other end of the primary side series compensation capacitor is electrically connected with one end of the primary side transmitting coil, and the other end of the primary side transmitting coil is electrically connected with the other end of the primary side parallel compensation inductor;
the primary side transmitting coil and the secondary side receiving coil are electromagnetically coupled;
two ends of the secondary side receiving coil are respectively electrically connected with a secondary side series compensation capacitor and a secondary side parallel compensation inductor, and the other end of the secondary side series compensation capacitor is electrically connected with the other end of the secondary side parallel compensation inductor;
two ends of the alternating current side of the rectifying circuit are electrically connected with two ends of the secondary side parallel compensation inductor respectively; and the direct current side of the rectifying circuit is electrically connected with the two ends of the load.
Preferably, the selecting of the parameters of the compensation topology structure specifically includes the following steps:
s1 design goals for the given system, including the input DC voltage V of the systeminAnd output DC voltage VoutThe variation range of the coupling coefficient k of the primary coil and the secondary coil;
s2, selecting proper primary side transmitting coil inductance L according to the actual space size of the transformerpThe transformer is a loose coupling transformer, and the resonance frequency omega of the series compensation part is selected according to the actually selected working frequency range of the power device1；
S3 primary side transmitting coil based inductance LpAnd a secondary side receiving coil LsThe relation between the secondary side receiving coil inductance L and the secondary side receiving coil inductance Ls；
S4 series compensation capacitance C based on original secondary sidep、CsInductance L with primary side transmitting coilpSecondary receiving coil inductance LsThe relationship between them makes up the partial resonance frequency omega of the series compensation1Calculating the primary and secondary series compensation capacitance Cp、Cs；
S5 primary side transmitting coil inductance LpSecondary receiving coil inductance LsAnd the coupling coefficient k and the original secondary side are connected in parallel to compensate inductance L1、L2The relation between the primary and secondary sides calculates the primary and secondary parallel compensation inductance L1、L2；
S6 finding the range of the working frequency omega of the compensation topological structure according to the values of the parameters calculated in the steps S1-S5.
The series compensation partial resonance frequency omega1The calculation formula of (a) is as follows:
in particular, the method comprises the following steps of,
ωpis the resonant frequency of the primary side series part and the secondary side series part
Due to LpCp＝LsCsTherefore ω isp＝ωs＝ω1。
Inductance L of the primary side transmitting coilpAnd a secondary side receiving coil LsThe relationship between them is expressed as follows:
wherein, UpAnd UsThe effective values of the AC side fundamental wave voltage of the inverter circuit and the AC side fundamental wave voltage of the rectifier circuit are respectively.
Specifically, for any compensation topology, the effective value U of the fundamental wave voltage on the alternating current side of the inverter circuitpAnd an input DC voltage VinA multiple relation exists between the two; effective value U of fundamental wave voltage on alternating current side of rectifying circuitsAnd output DC voltage VoutA multiple relation exists between the two; thus, the input DC voltage V is knowninAnd output DC voltage VoutThe effective value U of the fundamental wave voltage at the AC side of the transformer circuit can be obtainedpEffective value U of side-wave voltage alternating with rectifier circuitsThe value of (c).
The primary side and the secondary side are connected in series to compensate the capacitance Cp、CsInductance L with primary side transmitting coilpSecondary receiving coil inductance LsThe relationship between them is expressed as follows:
LpCp＝LsCs (3)。
primary side transmitting coil inductance LpSecondary receiving coil inductance LsAnd the coupling coefficient k and the original secondary side are connected in parallel to compensate inductance L1、L2The relationship between them is expressed as follows:
the range of the operating frequency ω is represented as follows:
specifically, in the above two frequency bands, the double parallel inductance compensation topology provided by the invention can realize stronger power regulation capability.
Preferably, in S5, the inductance L is compensated for the primary side in parallel1And after the calculation is finished, fine adjustment is carried out, so that the primary side transmitting coil generates a weak-inductance or weak-capacitance input impedance angle under the condition of not changing the power characteristic.
Preferably, a branch circuit where the primary side parallel compensation inductor is located is connected in series with a dc blocking capacitor for eliminating a dc component on the branch circuit.
Preferably, the inverter circuit adopts a half-bridge inverter structure, a full-bridge inverter structure or a push-pull inverter structure;
the primary side transmitting coil part and the secondary side receiving coil part are composed of magnetic cores and energy transfer coils wound by litz wires, and the magnetic cores are made of magnetic conductive materials.
Compared with the prior art, the invention has the advantages that:
the wireless power transmission compensation topological structure with the double parallel inductors is designed from the aspect of frequency characteristics, and by designing the resonant frequency of the primary and secondary side series compensation part, the ratio of the inductance of the primary and secondary side coils and the primary and secondary side parallel compensation inductors, a wider power output range can be realized through frequency adjustment under the condition that the loose coupling transformer is greatly deviated, and the reactive power at the input side of the compensation circuit is eliminated.
Drawings
FIG. 1 is a schematic diagram of a wireless power transmission compensation topology of the present invention;
FIG. 2 is a schematic diagram of a compensation topology with a DC blocking capacitor for wireless power transmission according to the present invention;
FIG. 3 is a schematic diagram of an equivalent circuit model of a wireless power transmission structure according to the present invention;
FIG. 4 is a waveform diagram for the case of the present embodiment just opposite to the full load;
FIG. 5 is an enlarged view taken at A in FIG. 4;
FIG. 6 is a waveform diagram of the present embodiment in the case of offset full load;
FIG. 7 is an enlarged view at B in FIG. 6;
FIG. 8 is a waveform diagram illustrating the case of the offset half-load of the present embodiment;
fig. 9 is an enlarged view at C in fig. 8.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 and 3, the wireless power transmission compensation topology structure with dual parallel inductors includes a dc power supply 10, an inverter circuit 20, a primary compensation network 30, a primary transmitting coil, a secondary receiving coil, a secondary compensation network 40, a rectifying circuit 50 and a load 60, which are electrically connected in sequence,
the primary side compensation network 30 includes a primary side parallel compensation inductor and a primary side series compensation capacitor;
the secondary side compensation network 40 comprises a secondary side parallel compensation inductor and a secondary side series compensation capacitor;
the direct current power supply 10 is electrically connected with the direct current side of the inverter circuit 20, and two ends of the alternating current side of the inverter circuit 20 are respectively electrically connected with two ends of the primary side parallel compensation inductor;
one end of the primary side series compensation capacitor is electrically connected with the primary side parallel compensation inductor, the other end of the primary side series compensation capacitor is electrically connected with the primary side transmitting coil, and the end of the primary side transmitting coil, which is not connected with the primary side series compensation capacitor, is electrically connected with the primary side parallel compensation inductor;
the primary side transmitting coil and the secondary side receiving coil are electromagnetically coupled;
two ends of the secondary side receiving coil are respectively electrically connected with a secondary side series compensation capacitor and a secondary side parallel compensation inductor, and the other end of the secondary side series compensation capacitor is electrically connected with the other end of the secondary side parallel compensation inductor;
two ends of the alternating current side of the rectifying circuit 50 are respectively electrically connected with two ends of the secondary side parallel compensation inductor; the dc side of the rectifier circuit 50 is electrically connected to two ends of the load 60.
As shown in fig. 2, based on the compensation topology shown in fig. 1, a dc blocking capacitor is connected in series to a branch where the primary side parallel compensation inductor is located to eliminate a dc component on the branch, and although there is no dc blocking capacitor connected in series to the branch where the primary side parallel compensation inductor is located in fig. 1, the dc component on the branch where the primary side parallel compensation inductor is located may be eliminated by other methods, such as controlling the inverter.
In this embodiment, an experimental prototype with a rated power of 2.1kW is provided, and a compensation topology structure as shown in fig. 2 is adopted to input a dc voltage Vin300V, and outputs DC voltage VoutWhen the voltage is 300V, the inverter circuit 20 adopts a full-bridge inverter circuit, the rectifier circuit 50 adopts a full-bridge uncontrolled rectifier circuit, and a power device of the inverter circuit 20 adopts a silicon carbide MOSFET module with the model of SK25MH120 TSCP; the power device of the rectification circuit 50 adopts an ultrafast soft recovery diode with the model of VS-C4PU6006LHN3, the sizes of the primary side transmitting coil and the secondary side receiving coil are both 600mm multiplied by 600mm, and the space distance is 1 in space50mm, the primary side and the secondary side are of DD structures, the magnetic cores are arranged in a strip-shaped magnetic core mode, and an aluminum plate with the same size is placed on the back of the coil for magnetic shielding; and measuring that the coupling coefficient under the condition that the primary side coil and the secondary side coil are opposite is 0.35, and the coupling coefficient under the worst deviation condition is 0.16, namely the value range of the coupling coefficient is more than or equal to 0.16 and less than or equal to 0.35; because the primary side parallel compensation inductor is directly connected in parallel to the AC side of the inverter, the output power is not influenced by slightly reducing the value of the primary side parallel compensation inductor, and the input impedance angle with weak inductance can be provided.
In this embodiment
Primary side transmitting coil inductance Lp280 muH series compensation partial resonance frequency omega1＝2π×85×103rad/s；
Because of the fact that
Then C isp＝12.6nF
And because of
While
So Ls＝280μH；
And due to LpCp＝LsCsSo that Cs＝12.6nF；
And because of
k ranges from 0.16 to 0.35, so L1＝78.4μH、L2＝78.4μH
According to the condition of soft switching of the selected power device, L is adjusted1Adjusted to 70 muH to achieve zero voltage turn-on
At the same time, a DC blocking capacitor CbIs selected to be 40 muF
The working frequency is selected from the range of：
I.e., 2 π × 80 × 103rad/s≤ω≤2π×97×103rad/s
Under the above parameter conditions, when the working state of the experimental prototype is just full load, i.e. the coupling coefficient k is 0.35 and the power is 2.1kW, the working frequency is 96.5kHz, and the specific waveform is shown in fig. 4, where v isdsAnd vgsDs terminal voltage and drive voltage, i, for a single tube in a silicon carbide MOSFET modulepFor the inverter AC side current iL1The current flowing through the inductor is compensated for the primary side in parallel; as can be seen from FIG. 4, ipAnd vdsIn phase, i.e. reactive power at the input side of the compensation circuit is eliminated.
When the experimental prototype is in the operating state with the worst offset, full load, i.e. coupling coefficient k is 0.16, power is 2.1kW, operating frequency is 85.9kHz, and specific waveform is shown in fig. 6, as can be seen from fig. 6, ipAnd vdsIn phase, i.e. reactive power at the input side of the compensation circuit is eliminated.
When the experimental prototype is under the operating condition of partial offset, half-load, i.e. coupling coefficient k is 0.30, power is 1.05kW, operating frequency is 90.2kHz, and specific waveform is shown in fig. 8, as can be seen from fig. 8, ipAnd vdsIn phase, i.e. reactive power at the input side of the compensation circuit is eliminated.
As can be seen from fig. 5, 7 and 9, the test prototype provided in this embodiment can realize ZVS (zero voltage switching on) under the above parameter conditions under the conditions of full load, offset full load and offset half load.
Namely, under the condition of meeting the parameter, whether the coupling coefficient of the test prototype is right or offset, whether the load is full load or not can eliminate the reactive power at the input side of the compensation circuit and realize zero voltage switching-on.
As can be seen from the above, the compensation topology structure provided by this embodiment has a strong offset fault-tolerant capability and a strong power regulation capability, and eliminates the reactive power at the input side of the compensation circuit, and realizes zero-voltage turn-on of the inverter. Based on the advantages, the dc-dc efficiency under the rated power of the actual measurement system is as high as 95.6%, and the efficiency is reduced by less than 1% when deviation occurs. The inverter ac side current hardly increases at offset, so that no consideration needs to be given to leave a large power margin when selecting the switching devices.
Claims (10)
1. The utility model provides a wireless power transmission compensation topological structure of two parallelly connected inductances, includes DC power supply, inverter circuit, former limit compensation network, former limit transmitting coil, secondary receiving coil, secondary compensation network, rectifier circuit and load, its characterized in that:
the primary side compensation network comprises a primary side parallel compensation inductor and a primary side series compensation capacitor;
the secondary side compensation network comprises a secondary side parallel compensation inductor and a secondary side series compensation capacitor;
two ends of the alternating current side of the inverter circuit are respectively and electrically connected with two ends of the primary side parallel compensation inductor;
one end of the primary side series compensation capacitor is electrically connected with one end of the primary side parallel compensation inductor, the other end of the primary side series compensation capacitor is electrically connected with one end of the primary side transmitting coil, and the other end of the primary side transmitting coil is electrically connected with the other end of the primary side parallel compensation inductor;
two ends of the secondary side receiving coil are respectively electrically connected with a secondary side series compensation capacitor and a secondary side parallel compensation inductor, and the other end of the secondary side series compensation capacitor is electrically connected with the other end of the secondary side parallel compensation inductor;
and two ends of the secondary side parallel compensation inductor are electrically connected with two ends of the alternating current side of the rectifying circuit respectively.
2. The wireless power transmission compensation topology structure with double parallel inductors according to claim 1, wherein the selection of the parameters of the compensation topology structure specifically comprises the following steps:
s1 design goals for the given system, including the input DC voltage V of the systeminAnd output DC voltage VoutOriginal and auxiliary side lineThe variation range of the coupling coefficient k of the ring;
s2, selecting proper primary side transmitting coil inductance L according to the actual space size of the transformerpSelecting a resonance frequency omega of the series compensation part according to the actually selected working frequency range of the power device1；
S3 primary side transmitting coil based inductance LpAnd a secondary side receiving coil LsThe relation between the secondary side receiving coil inductance L and the secondary side receiving coil inductance Ls；
S4 series compensation capacitance C based on original secondary sidep、CsInductance L with primary side transmitting coilpSecondary receiving coil inductance LsThe relationship between them makes up the partial resonance frequency omega of the series compensation1Calculating the primary and secondary series compensation capacitance Cp、Cs；
S5 primary side transmitting coil based inductance LpSecondary receiving coil inductance LsAnd the coupling coefficient k and the original secondary side are connected in parallel to compensate inductance L1、L2The relation between the primary and secondary sides calculates the primary and secondary parallel compensation inductance L1、L2；
S6 finding the range of the working frequency omega of the compensation topological structure according to the values of the parameters calculated in the steps S1-S5.
3. The topology of claim 2, wherein the series compensation partial resonant frequency ω is a frequency of the wireless power transmission compensation1The calculation formula of (a) is as follows:
4. the topology of claim 3, wherein said primary side transmitter coil inductance L ispAnd a secondary side receiving coil LsThe relationship between them is expressed as follows:
wherein, UpAnd UsThe effective values of the AC side fundamental wave voltage of the inverter circuit and the AC side fundamental wave voltage of the rectifier circuit are respectively.
5. The topology structure of claim 4, wherein the primary and secondary sides are connected in series to compensate for capacitance Cp、CsInductance L with primary side transmitting coilpSecondary receiving coil inductance LsThe relationship between them is expressed as follows:
LpCp＝LsCs (3)。
6. the topology of claim 5, wherein the primary side transmitter coil inductance L ispSecondary receiving coil inductance LsAnd the coupling coefficient k and the original secondary side are connected in parallel to compensate inductance L1、L2The relationship between them is expressed as follows:
7. the topology of claim 6, wherein the range of the operating frequency ω is represented as follows:
8. the topology of claim 2, wherein in step S5, the primary side is compensated with the inductor L in parallel1And after the calculation is finished, fine adjustment is carried out, so that the primary side transmitting coil generates a weak-inductance or weak-capacitance input impedance angle under the condition of not changing the power characteristic.
9. The wireless power transmission compensation topology structure with double parallel inductors according to claim 1, wherein a branch circuit on which the primary side parallel compensation inductor is located is connected in series with a dc blocking capacitor for eliminating a dc component on the branch circuit.
10. The wireless power transmission compensation topology structure with double parallel inductors according to claim 1, wherein the inverter circuit adopts a half-bridge inverter structure, a full-bridge inverter structure or a push-pull inverter structure;
the primary side transmitting coil part and the secondary side receiving coil part are composed of magnetic cores and energy transfer coils wound by litz wires, and the magnetic cores are made of magnetic conductive materials.
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