CN112018905A - Parameter setting method of LCCL-LC wireless power transmission system - Google Patents

Parameter setting method of LCCL-LC wireless power transmission system Download PDF

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CN112018905A
CN112018905A CN202010795150.1A CN202010795150A CN112018905A CN 112018905 A CN112018905 A CN 112018905A CN 202010795150 A CN202010795150 A CN 202010795150A CN 112018905 A CN112018905 A CN 112018905A
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lccl
inductance
frequency
resonance
transmission system
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CN112018905B (en
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李志忠
张亦弛
夏振林
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Guangdong University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

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Abstract

The invention discloses a parameter setting method of an LCCL-LC wireless electric energy transmission system, which selects proper transmitting and receiving coils according to the requirement of transmission power, calculates the specific value of the inductance by determining the relation between the inductance of a primary transmitting coil and the resonance inductance, thereby determining the value of the resonance inductance, and determines other compensation capacitors through the resonance relation of a circuit. The method has the advantages that the LCCL-LC wireless electric energy system parameter can be rapidly and accurately determined, and the LCCL-LC system designed by the method has the advantages of constant voltage output, high transmission efficiency and stable and efficient work in a full load range; by the method, system parameters can be quickly designed according to the requirement of actual transmission power, and the requirement of engineering application is met.

Description

Parameter setting method of LCCL-LC wireless power transmission system
Technical Field
The invention relates to the field of wireless power transmission, in particular to a parameter setting method of an LCCL-LC wireless power transmission system.
Background
The Magnetic Coupling Resonance Wireless Power Transmission (MCRWPT) has the advantages of high transmission power level, high transmission efficiency, good safety and strong applicability, is a hot spot of the conventional wireless power transmission, and has wide application prospect. Because the magnetic coupling resonant wireless power transmission transmitting coil and the magnetic coupling resonant wireless power transmission receiving coil are loosely coupled, the coupling coefficient is small, and the efficiency of energy transmission is seriously influenced; in order to improve the transmission efficiency, the addition of the compensation network is important.
In practical application, wireless power transmission should have the characteristics of constant voltage, stability and high efficiency, and a basic type compensation network cannot meet the requirement of stable transmission when the load changes, so that a complex high-order compensation network becomes a research direction and comprises an LCL type, an LLCL type, an LCCL type and the like; of which the LCCL type has proven to be a viable solution. However, because the high-order compensation network devices are multiple and the structure is complex, how to quickly determine the circuit parameters and realize efficient and stable high-power energy transmission is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a parameter setting method of an LCCL-LC wireless power transmission system, which is used for quickly determining circuit parameters so as to realize high-efficiency and stable high-power energy transmission.
In order to realize the task, the invention adopts the following technical scheme:
a parameter setting method of an LCCL-LC wireless electric energy transmission system comprises the following steps:
modeling and analyzing the LCCL-LC wireless electric energy transmission system, and converting the total impedance of the secondary side to the primary side through mutual inductance; selecting a proper transmitting coil and a proper receiving coil according to the rated output power requirement, determining the relation between the primary transmitting coil inductance and the resonance inductance, and then determining the inductance value of the resonance inductance; determining values of a resonance capacitor and a compensation capacitor according to the resonance relation of the LCCL-LC wireless power transmission system circuit;
the LCCL-LC wireless electric energy transmission system circuit comprises an input filter capacitor, a high-frequency power conversion circuit, an LCCL compensation network, a compensation capacitor, a high-frequency rectification circuit and an output filter capacitor, wherein an input direct-current power supply VinAnd an input filter capacitor CinThe full-bridge high-frequency power conversion circuit is connected in parallel, and is connected to the LCCL compensation network on the primary side after being input into the filter capacitor; the LCCL compensation network includes a resonant inductor LPFirst resonant capacitor CPA second resonant capacitor CTAnd a transmitting coil inductance LTSecondary side receiving coil inductance LRCompensation capacitor C connected with receiving coilRThen connected to a high-frequency rectifying circuit for high-frequencyThe rectifying circuit is connected with a load through an output filter capacitor;
the transmitting coil inductance LTAnd a resonant inductor LPHas a relationship of Lp＝αLTWherein, the value range of the coefficient alpha is (0,1), and the expression is as follows:
Figure BDA0002625317600000021
wherein U isin1Is a first resonant capacitor CPValue of voltage above, RLAt a rated load value, PoutAnd in order to obtain rated output power, omega is the working frequency of the system, M is the mutual inductance value of the transmitting coil and the receiving coil, and k is the coupling coefficient of the transmitting coil and the receiving coil.
Further, the first resonant capacitor CPValue of voltage Uin1Expressed as:
Figure BDA0002625317600000022
in the above formula, UinK is an odd number, and is an input direct-current voltage value of the high-frequency power conversion circuit.
Further, determining values of a resonance capacitor and a compensation capacitor according to a resonance relation of the LCCL-LC wireless power transmission system circuit, including:
calculating to obtain the resonant inductance LPAfter the value of (1), the first resonant capacitor CPIs determined by its value and the resonant inductance LPCalculating the resonance relationship of (C), the second resonance capacitance CTIs set by the value of (C) and the first resonant capacitorPAnd a transmitting coil inductance LTCalculating the resonance relation of (1); compensation capacitor CRBy its inductance L with the receiving coilRThe resonance relationship of (2) is calculated.
Furthermore, the full-bridge high-frequency power conversion circuit is composed of four MOSFET switching tubes with the same specification, and the high-frequency rectification circuit is composed of four high-frequency rectification diodes with the same specification.
Further, the transmitting coil and the receiving coil both adopt cylindrical spiral coils with the same specification.
Further, when the secondary side compensation capacitor is calculated, the selected resonant frequency is consistent with the resonant frequency of the primary side.
Furthermore, the working frequency of the high-frequency power conversion circuit is modulated to be larger than the resonant frequency of the LCCL compensation network, so that the compensation network works in an inductive area, four MOSFET switching tubes in the high-frequency power conversion circuit work in a soft switching state, and the transmission efficiency of the system is improved.
Further, when the parameter setting method is used, the corresponding given condition is an input voltage value UinSystem operating frequency omega, rated load RLAnd rated output power PoutAnd a pair of cylindrical spiral coils with the same specification, known mutual inductance and determined inductance value, which are suitable for the rated output power condition, are used as the transmitting coil and the receiving coil.
Compared with the prior art, the invention has the following technical characteristics:
1. the parameter setting method provided by the invention enables the parameter design of the circuit to be rapid and accurate, and can rapidly determine the appropriate compensation network parameters under the condition of giving necessary system parameters.
2. The LCCL-LC system designed based on the method can realize the constant current output of the transmitting coil and the constant voltage output of the receiving coil; the stability is good when the load changes, and the stable and efficient output can be kept under the full load state; ZVS of a switching tube can be effectively realized, and transmission efficiency of the system is improved. When the transmission distance is changed within a certain range, higher transmission efficiency can be kept.
Drawings
Fig. 1 is a circuit configuration diagram of an LCCL-LC wireless power transmission system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating specific steps of a method for setting LCCL-LC wireless power transmission parameters according to an embodiment of the present invention;
fig. 3 is a graph of transmission efficiency of a test prototype as a function of distance in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
The invention provides a parameter setting method of an LCCL-LC wireless power transmission system, which is characterized in that the parameter setting of a circuit is completed by revealing the quantity relation of transmitting coil inductance and resonance inductance and calculating the value of resonance capacitance according to resonance conditions. The technical scheme of the invention is as follows:
modeling and analyzing the LCCL-LC wireless electric energy transmission system, and converting the total impedance of the secondary side to the primary side through mutual inductance; selecting proper transmitting coils and receiving coils according to the rated output power requirement; for example, according to a given transmission power, a coil that meets the transmission power requirement is selected at a set transmission distance. In this implementation, the transmitting coil and the receiving coil both adopt cylindrical spiral coils with the same specification.
Determining the quantity relation between the inductance values of the transmitting coil inductor and the resonant inductor, and further determining the inductance value of the resonant inductor; determining the value of a compensation capacitor according to the resonance relation between LCCL-LC wireless power transmission system circuit compensation devices; the switching tube in the high-frequency power conversion circuit is enabled to work in a soft switching state, and the efficiency of the system is improved.
The circuit of the LCCL-LC wireless power transmission system is shown in figure 1 and comprises an input filter capacitor, a high-frequency power conversion circuit, an LCCL compensation network, a compensation capacitor, a high-frequency rectification circuit and an output filter capacitor, wherein an input direct-current power supply VinAnd an input filter capacitor CinThe full-bridge high-frequency power conversion circuit is connected in parallel, is connected with a full-bridge high-frequency power conversion circuit consisting of four MOSFET switching tubes with the same specification after being input into the filter capacitor, and is connected to an LCCL compensation network on the primary side; the LCCL compensation network includes a resonant inductor LPFirst resonant capacitor CPA second resonant capacitor CTAnd a transmitting coil inductance LTThe receiving coil of the secondary side is connected with a receiving coil compensation capacitor CRThen high-frequency rectification with four specificationsThe high-frequency rectifying circuit formed by the diodes is connected with the load through the output filter capacitor.
Performing kirchhoff current theorem (KCL) and kirchhoff voltage theorem (KVL) analysis on the circuit, wherein when the circuit is in a resonance state, the relationship between the compensation devices is as follows:
Figure BDA0002625317600000041
in the above formula, CTIs a second resonant capacitor, CPIs a first resonant capacitor, LPIs a resonant inductor, LTIs a transmitting coil inductance;
transmitting coil inductance LTAnd a resonant inductor LPThe relationship is as follows:
Lp＝αLT
wherein the value range of alpha is (0, 1).
By circuit analysis, the expression of alpha is:
Figure BDA0002625317600000042
wherein U isin1Compensating a first resonant capacitance C in a network for LCCLPValue of voltage above, RLAt a rated load value, PoutAnd in order to obtain rated output power, omega is the working frequency of the system, M is the mutual inductance value of the transmitting coil and the receiving coil, and k is the coupling coefficient of the transmitting coil and the receiving coil.
Wherein, Uin1The expression of (a) is:
Figure BDA0002625317600000043
in the above formula, UinK is an odd number, and is an input direct-current voltage value of the high-frequency power conversion circuit.
From this, the resonance inductance L is calculatedPOf the first resonant capacitor C, and further, the first resonant capacitor CPIs given a value ofResonant inductor LPThe resonance relationship of (2) is calculated. Second resonant capacitor CTIs set by the value of (C) and the first resonant capacitorPAnd a transmitting coil inductance LTCalculating the resonance relation of (1); receiving end compensation capacitor CRBy its inductance L with the receiving coilRCalculating the resonance relation of (1); in calculating the compensation capacitance CRWhen the value is obtained, the resonant frequency values of the receiving end and the transmitting end are the same, namely the resonant frequency selected by the secondary side is consistent with that of the primary side.
The working frequency of the high-frequency power conversion circuit is modulated to be slightly larger than the resonant frequency of the LCCL compensation network, so that the compensation network works in an inductive area, four MOSFET switching tubes in the high-frequency power conversion circuit work in a soft switching state, and the transmission efficiency of the system is improved.
When using the parameter setting method, the corresponding given condition is the input voltage value UinSystem operating frequency omega, rated load RLAnd rated output power PoutAnd a pair of cylindrical spiral coils with the same specification, known mutual inductance and determined inductance value, which are suitable for the rated output power condition, are used as the transmitting coil and the receiving coil.
Example (b):
a structure diagram of an LCCL-LC wireless power transmission system provided in this embodiment is shown in fig. 1, where the circuit structure includes an input filter capacitor, a high-frequency power conversion circuit, an LCCL compensation network, a transmitting coil, a receiving coil, a compensation capacitor, a high-frequency rectification circuit, and a load.
The commercial power is rectified, filtered by an input filter capacitor, input into a high-frequency power conversion circuit, the high-frequency power conversion circuit outputs high-frequency alternating current with certain frequency, the high-frequency alternating current is compensated by an LCCL compensation network and provides high-frequency alternating current for a transmitting coil, electric energy is transmitted to a receiving coil on a secondary side through electromagnetic induction, the receiving coil resonates with the compensation capacitor, the transmission power and efficiency are improved, a high-frequency rectifying circuit connected with the receiving coil and the compensation capacitor rectifies the alternating current into direct current, and the direct current is filtered by an output capacitor to provide electric energy for a load.
The LCCL-LC wireless power transmission system with the transmission power of 300W is designed according to the method of the invention to verify the feasibility and the advantages of the method. The design criteria of the system are shown in table 1.
Design index of wireless power transmission system of meter 1
Figure BDA0002625317600000051
The voltage of the take-up coil and the actual measurement efficiency of the system under different loads are shown in table 2, and the actual measurement transmission efficiency is shown in fig. 3 under different distances. The test result of a prototype shows that the LCCL-LC wireless electric energy transmission system designed according to the method can stably and efficiently work in a full-load range, the transmission power reaches the design standard, and the transmission efficiency can be kept higher when the coil distance is changed in a certain range, thereby verifying the feasibility and the excellent effect of the method.
TABLE 2 actual measurement efficiency of winding coil voltage and system under different loads
Load/omega 25 50 75
Terminal voltage/V of receiving terminal 86.64 87.86 88.08
System transmission efficiency 93.07％ 94.13％ 93.51％
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A parameter setting method of an LCCL-LC wireless electric energy transmission system is characterized by comprising the following steps:
modeling and analyzing the LCCL-LC wireless electric energy transmission system, and converting the total impedance of the secondary side to the primary side through mutual inductance; selecting a proper transmitting coil and a proper receiving coil according to the rated output power requirement, determining the relation between the primary transmitting coil inductance and the resonance inductance, and then determining the inductance value of the resonance inductance; determining the value of the resonance capacitance according to the resonance relation of the LCCL-LC wireless electric energy transmission system circuit;
the LCCL-LC wireless electric energy transmission system circuit comprises an input filter capacitor, a high-frequency power conversion circuit, an LCCL compensation network, a compensation capacitor, a high-frequency rectification circuit and an output filter capacitor, wherein an input direct-current power supply VinAnd an input filter capacitor CinThe full-bridge high-frequency power conversion circuit is connected in parallel, and is connected to the LCCL compensation network on the primary side after being input into the filter capacitor; the LCCL compensation network includes a resonant inductor LPFirst resonant capacitor CPA second resonant capacitor CTAnd a transmitting coil inductance LTSecondary side receiving coil inductance LRCompensation capacitor C connected with receiving coilRThen the high-frequency rectifying circuit is connected with a high-frequency rectifying circuit, and the high-frequency rectifying circuit is connected with a load through an output filter capacitor;
the transmitting coil inductance LTAnd a resonant inductor LPHas a relationship of Lp＝αLTWherein, the value range of the coefficient alpha is (0,1), and the expression is as follows:
Figure FDA0002625317590000011
wherein U isin1Is a first resonant capacitor CPValue of voltage above, RLAt a rated load value, PoutAnd in order to obtain rated output power, omega is the working frequency of the system, M is the mutual inductance value of the transmitting coil and the receiving coil, and k is the coupling coefficient of the transmitting coil and the receiving coil.
2. The LCCL-LC wireless power transmission system parameter setting method of claim 1, characterized in that the first resonance capacitor CPValue of voltage Uin1Expressed as:
Figure FDA0002625317590000012
in the above formula, UinK is an odd number, and is an input direct-current voltage value of the high-frequency power conversion circuit.
3. The method for setting parameters of the LCCL-LC wireless power transmission system according to claim 1, wherein the determining the values of the resonance capacitor and the compensation capacitor from the resonance relationship of the LCCL-LC wireless power transmission system circuit comprises:
calculating to obtain the resonant inductance LPAfter the value of (1), the first resonant capacitor CPIs determined by its value and the resonant inductance LPCalculating the resonance relationship of (C), the second resonance capacitance CTIs set by the value of (C) and the first resonant capacitorPAnd a transmitting coil inductance LTCalculating the resonance relation of (1); compensation capacitor CRBy its inductance L with the receiving coilRThe resonance relationship of (2) is calculated.
4. The method for setting parameters of the LCCL-LC wireless power transmission system according to claim 1, wherein the full-bridge high-frequency power conversion circuit is composed of four MOSFET switching tubes with the same specification, and the high-frequency rectification circuit is composed of four high-frequency rectifying diodes with the same specification.
5. The method for setting parameters of the LCCL-LC wireless power transmission system according to claim 1, wherein the transmitting coil and the receiving coil both use cylindrical spiral coils with the same specification.
6. The method for setting parameters of the LCCL-LC wireless power transmission system according to claim 1, wherein the selected resonance frequency is consistent with the resonance frequency of the primary side when calculating the secondary side resonance capacitance.
7. The method for setting parameters of the LCCL-LC wireless power transmission system according to claim 1, wherein the compensation network operates in an inductive region by modulating the operating frequency of the high frequency power conversion circuit to be greater than the resonant frequency of the LCCL compensation network, so that four MOSFET switching tubes in the high frequency power conversion circuit operate in a soft switching state, thereby improving the transmission efficiency of the system.
8. The LCCL-LC wireless power transmission system parameter setting method according to claim 1, characterized in that when the parameter setting method is used, the corresponding given condition is an input voltage value UinSystem operating frequency omega, rated load RLAnd rated output power PoutAnd a pair of cylindrical spiral coils with the same specification, known mutual inductance and determined inductance value, which are suitable for the rated output power condition, are used as the transmitting coil and the receiving coil.
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