阅读说明：本技术 基于电感集成式lcc补偿拓扑的无线充电耦合机构 (Wireless charging coupling mechanism based on inductance integrated LCC compensation topology ) 是由 闻枫 李睿 *** 刘力 荆凡胜 成星辰 楚晓虎 韩晨 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种基于电感集成式LCC补偿拓扑的无线充电耦合机构,包括发射端和接收端两个部分,所述发射端包括DD型发射线圈层、发射端铁氧体层、发射端补偿线圈、发射端屏蔽层,以及发射端隔直电容、发射端谐振电容；所述接收端包括DD型接收线圈层、接收端铁氧体层、接收端补偿线圈、接收端屏蔽层,以及接收端隔直电容、接收端谐振电容,所述发射端补偿线圈缠绕在发射端铁氧体上；所述接收端补偿线圈缠绕在接收端铁氧体上。本发明将传统LCC补偿电路的附加谐振电感用补偿线圈替换且与主线圈集成,节省了收发端用于放置附加谐振电感的空间,同时保持了传统LCC拓扑的电路特征以及输出功率不变。(The invention discloses a wireless charging coupling mechanism based on inductance integrated LCC compensation topology, which comprises a transmitting end and a receiving end, wherein the transmitting end comprises a DD-type transmitting coil layer, a transmitting end ferrite layer, a transmitting end compensation coil, a transmitting end shielding layer, a transmitting end blocking capacitor and a transmitting end resonant capacitor; the receiving end comprises a DD type receiving coil layer, a receiving end ferrite layer, a receiving end compensation coil, a receiving end shielding layer, a receiving end blocking capacitor and a receiving end resonance capacitor, and the transmitting end compensation coil is wound on the transmitting end ferrite; and the receiving end compensation coil is wound on the receiving end ferrite. The invention replaces the additional resonance inductance of the traditional LCC compensating circuit with the compensating coil and integrates the compensating coil with the main coil, thereby saving the space for placing the additional resonance inductance at the transmitting and receiving ends and simultaneously keeping the circuit characteristics and the output power of the traditional LCC topology unchanged.)

1. A wireless charging coupling mechanism based on inductance integrated LCC compensation topology comprises a transmitting end and a receiving end, wherein the transmitting end comprises a DD type transmitting coil layer, a transmitting end ferrite layer, a transmitting end compensation coil, a transmitting end shielding layer, a transmitting end blocking capacitor and a transmitting end resonant capacitor; the receiving end comprises a DD type receiving coil layer, a receiving end ferrite layer, a receiving end compensation coil, a receiving end shielding layer, a receiving end blocking capacitor and a receiving end resonance capacitor, and is characterized in that the transmitting end compensation coil is wound on the transmitting end ferrite; and the receiving end compensation coil is wound on the receiving end ferrite.

2. The wireless charging coupling mechanism based on inductance integrated LCC compensation topology of claim 1, wherein said transmitting end shielding layer and receiving end shielding layer both use aluminum plate with thickness of 2mm-3 mm.

3. The inductance-integrated LCC compensation topology-based wireless charging coupling mechanism according to claim 1, wherein said transmitting end ferrite layer comprises 5 ferrite bars arranged with uniform gap along the long side of the transmitting coil.

4. The inductively integrated LCC compensation topology based wireless charging coupling mechanism of claim 3, wherein the transmit end compensation coil is wound on a transmit end ferrite strip or strips.

5. The inductively integrated LCC compensation topology based wireless charging coupling mechanism of claim 3, wherein the length of the ferrite strip of the transmitting end is smaller than the long side of the transmitting coil.

6. The inductance-integrated LCC compensation topology-based wireless charging coupling mechanism of claim 1, wherein said receiving end ferrite layer comprises 3 ferrite bars arranged with uniform gap along the long side of the receiving coil.

7. The inductively integrated LCC compensation topology based wireless charging coupling mechanism of claim 6, wherein the receiving end compensation coil is wound on one or more ferrite strips at the receiving end.

8. The wireless charging coupling mechanism based on inductance integrated LCC compensation topology of claim 6, wherein the length of receiving end ferrite strip is smaller than the long side of receiving coil.

9. The inductively integrated LCC compensated topology based wireless charging coupling mechanism of claim 1, wherein the transmit side compensation coil self-inductance L_1aReceiving end compensation coil self-inductance L_2aThe design is as follows:

in the formula, L₁、L_TRespectively adding resonance inductance and transmitting coil self-inductance to a transmitting end of a traditional LCC compensation network; l is₂、L_RA resonance inductor and a receiving coil self-inductance are respectively added to a receiving end of the traditional LCC compensation network; k is a radical of₁、k₂Respectively a transmitting end compensation coil and a transmitting coil, and a receiving end compensation coil and a receiving coil.

Technical Field

The invention relates to a wireless charging technology, in particular to a wireless charging coupling mechanism based on an inductance integrated LCC compensation topology.

Background

In the aspect of wireless charging of electric vehicles, the magnetic coupling resonance technology has the advantages of high energy transmission power and efficiency, long transmission distance, low transmission direction requirement and the like, and thus becomes a main charging mode. In the coupling mechanism of the magnetic coupling resonant wireless charging system of the electric automobile, energy is transferred through mutual inductance between the transmitting coil and the receiving coil, but due to the large gap between the coils, the coupling coefficient is usually in the range of 0.1 to 0.3, so that the system has considerable leakage inductance. In order to solve the problem, the coil is designed into a bipolar DD structure in the prior art, the coupling between the transmitting coil and the receiving coil is increased, and the horizontal anti-offset performance better than that of a disc type coil is obtained under the similar size; meanwhile, the LCC compensation circuit is adopted, so that the complexity of system control is greatly simplified, and the charging current of a load battery only depends on the input voltage of the system no matter what the load changes. However, the LCC compensation network is generally disposed outside the coupling mechanism composed of the DD type coil, and the LCC compensation network requires additional configuration inductance, which makes the entire system complicated and takes up a large space.

Disclosure of Invention

The invention aims to provide a wireless charging coupling mechanism based on an inductance integrated LCC compensation topology, which improves the conditions of complex system and large occupied space.

The technical solution for realizing the purpose of the invention is as follows: a wireless charging coupling mechanism based on inductance integrated LCC compensation topology comprises a transmitting end and a receiving end, wherein the transmitting end comprises a DD type transmitting coil layer, a transmitting end ferrite layer, a transmitting end compensation coil, a transmitting end shielding layer, a transmitting end blocking capacitor and a transmitting end resonant capacitor; the receiving end comprises a DD type receiving coil layer, a receiving end ferrite layer, a receiving end compensation coil, a receiving end shielding layer, a receiving end blocking capacitor and a receiving end resonance capacitor, and the transmitting end compensation coil is wound on the transmitting end ferrite; and the receiving end compensation coil is wound on the receiving end ferrite.

The transmitting end shielding layer and the receiving end shielding layer both adopt aluminum plates with the thickness of 2mm-3 mm.

The transmitting end ferrite layer comprises 5 ferrite strips which are transversely and uniformly arranged along the long edge of the transmitting coil in a clearance mode.

The transmitting terminal compensation coil is wound on one or more ferrite strips at the transmitting terminal.

The length of the ferrite strip at the transmitting end is smaller than the long side of the transmitting coil.

The receiving end ferrite layer comprises 3 ferrite strips which are arranged along the long edge of the receiving coil in a transverse uniform gap mode.

And the receiving end compensation coil is wound on one or more ferrite strips at the receiving end.

The length of the receiving end ferrite strip is smaller than the long edge of the receiving coil.

The transmitting terminal compensation coil has self-inductance L_1aReceiving end compensation coil self-inductance L_2aThe design is as follows:

in the formula, L₁、L_TRespectively adding resonance inductance and transmitting coil self-inductance to a transmitting end of a traditional LCC compensation network; l is₂、L_RA resonance inductor and a receiving coil self-inductance are respectively added to a receiving end of the traditional LCC compensation network; k is a radical of₁、k₂Respectively a transmitting end compensation coil and a transmitting coil, and a receiving end compensation coil and a receiving coil.

Compared with the prior art, the invention has the remarkable advantages that: by winding the compensating coil on the main coil ferrite strip, the additional resonant inductor of the traditional LCC compensating circuit is replaced by the compensating coil and is integrated with the main coil, so that the space for placing the additional resonant inductor at the transmitting and receiving end is saved, and the circuit characteristics and the output power of the traditional LCC topology are kept unchanged.

Drawings

Fig. 1 is a schematic diagram of a wireless charging coupling mechanism based on an inductance integrated LCC compensation topology according to the present invention.

Fig. 2 is a circuit diagram of a wireless charging coupling mechanism based on a conventional LCC compensation topology.

Fig. 3 is a circuit diagram of a wireless charging coupling mechanism based on an inductive integrated LCC compensation topology.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings.

The invention provides a wireless charging coupling mechanism based on inductance integrated LCC compensation topology, which replaces the additional resonance inductance of the traditional LCC compensation circuit with the compensation coil and integrates the compensation coil with the main coil (a transmitting coil and a receiving coil) by winding the compensation coil on the ferrite strip of the main coil (the transmitting coil and the receiving coil), thereby saving the space for placing the additional resonance inductance at the transmitting and receiving ends and simultaneously keeping the circuit characteristics and the output power of the traditional LCC topology unchanged.

As shown in fig. 1, the wireless charging coupling mechanism based on the inductance integrated LCC compensation topology includes two parts, namely a transmitting end and a receiving end. The transmitting end comprises a DD type transmitting coil layer, a transmitting end ferrite layer, a transmitting end compensation coil wound on the transmitting end ferrite, a transmitting end shielding layer, a transmitting end stopping capacitor and a transmitting end resonant capacitor which are sequentially arranged from top to bottom; the receiving end comprises a DD type receiving coil layer, a receiving end ferrite layer, a receiving end compensation coil wound on the receiving end ferrite, a receiving end shielding layer, a receiving end blocking capacitor and a receiving end resonant capacitor which are sequentially arranged from bottom to top. The connection mode between the transmitting coil and the transmitting end blocking capacitor, the transmitting end resonant capacitor, the transmitting end compensation coil and between the receiving coil and the receiving end blocking capacitor, the receiving end resonant capacitor and the receiving end compensation coil is consistent with that of the traditional LCC topology, and the current flow directions of the transmitting coil and the transmitting end compensation coil are consistent (clockwise or anticlockwise). The method specifically comprises the following steps: two ends of the transmitting coil are respectively connected with the cathode of a transmitting end blocking capacitor and the cathode of a transmitting end resonant capacitor, the anode of the transmitting end resonant capacitor is connected with the anode of the transmitting end resonant capacitor, and two ends of the transmitting end blocking capacitor are connected with a series branch of a transmitting end compensation coil and an input voltage source in parallel; the two ends of the receiving coil are respectively connected with the negative electrode of the receiving end blocking capacitor and the negative electrode of the receiving end resonant capacitor, the positive electrode of the receiving end resonant capacitor is connected with the positive electrode of the receiving end resonant capacitor, and the two ends of the receiving end blocking capacitor are connected with the series branch of the receiving end compensation coil and the battery in parallel.

In some embodiments, the transmitting ferrite layer comprises 5 ferrite bars, and the receiving ferrite layer comprises 3 ferrite bars, which are arranged along the long side of the main coil (transmitting coil and receiving coil) with uniform gap in the transverse direction for enhancing coupling and guiding magnetic flux. The compensation coil can be wound on one ferrite strip or a plurality of ferrite strips and is used for replacing the additional resonance inductance of the traditional LCC compensation network.

In still other embodiments, the length of the ferrite strip at the transmitting end and the receiving end is set to be smaller than the long side of the corresponding coil. The capacitor is arranged in the gap between the ferrite strip and the shell, and the integration level of the mechanism is further improved.

In some embodiments, the shielding layer of the transceiving end is an aluminum plate, and the thickness of the shielding layer is 2mm-3 mm. The magnetic shielding effect is guaranteed, meanwhile, the production cost is reduced, and the quality of the mechanism is reduced.

The transmitting terminal compensation coil has self-inductance L_1aReceiving end compensation coil self-inductance L_2aIt is necessary to ensure that the wireless charging coupling mechanism of the inductance integrated LCC compensation topology is consistent with the circuit characteristics and output power of the conventional LCC compensation topology.

Fig. 2 is an equivalent circuit diagram of a wireless charging coupling mechanism based on a conventional LCC compensation topology, and the KVL equation is written according to the circuit diagram column:

in the formula of U_i、U_oInput voltage and output voltage respectively; i is_i、I_T、I_R、I_oRespectively inputting current, electrifying current for the transmitting coil, electrifying current for the receiving coil and outputting current; l is₁、C₁、C_T、L_TA resonance inductor, a transmitting coil resonance capacitor, a transmitting coil blocking capacitor and a transmitting coil self-inductance are added to the transmitting end respectively; l is₂、C₂、C_R、L_RA resonance inductor, a receiving coil resonance capacitor, a receiving coil blocking capacitor and a receiving coil self-inductance are added to the receiving end respectively; m is the mutual inductance between the transceiver coils.

The resonance conditions of the LCC compensation topology are:

combining equations (1) and (2), the expression of the loop current can be solved:

as can be seen from the above formula, by adopting the traditional LCC compensation topology, the current I introduced by the transmitting coil is no matter how the load and the coupling are changed_TDependent only on the input voltage U of the system_iThis greatly simplifies the complexity of system control; at the same time, the output current I of the system_oAlso only with the input voltage U of the system_iAnd mutual inductance M between the transceiver coils, constant current charging can be easily achieved.

Fig. 3 is an equivalent circuit diagram of a wireless charging coupling mechanism based on an inductive integrated LCC compensation topology. The change is that the additional resonance inductance of the transmitting end and the receiving end is respectively replaced by the transmitting end compensation coil and the receiving end compensation coil, so that additional mutual inductance is generated between the transmitting end compensation coil and the transmitting coil and between the receiving end compensation coil and the receiving coil. Because the transmitting end compensation coil and the receiving end compensation coil are relatively small and the distance between the transmitting coil and the receiving coil is relatively long, the mutual inductance between the transmitting end compensation coil and the receiving coil and between the receiving end compensation coil and the transmitting coil can be ignored in circuit analysis. The KVL equation for the column write system is as follows:

in the formula of U_ia、U_oaRespectively an improved input voltage and an improved output voltage; i is_ia、I_Ta、I_Ra、I_oaRespectively inputting current, inputting current into the transmitting coil, inputting current into the receiving coil and outputting current after improvement; l is_1a、C_1a、C_TaRespectively providing an improved transmitting end compensation coil self inductance, a transmitting coil resonance capacitor and a transmitting coil blocking capacitor; l is_2a、C_2a、C_RaRespectively providing improved self-inductance of a receiving end compensation coil, a receiving coil resonance capacitor and a receiving coil blocking capacitor; m_T1、M_R2Mutual inductance between the transmitting end compensation coil and the transmitting coil and between the receiving end compensation coil and the receiving coil respectively.

The resonance conditions of the improved LCC compensation topology are as follows:

the loop current expression after the improvement can be solved by combining the formulas (4) and (5):

by observing the above formula, the system still maintains the circuit characteristics of the traditional LCC compensation topology by adopting the inductance integrated LCC compensation topology structure.

According to the formula defined by mutual inductance, M_T1、M_R2Expression (c):

in the formula, k₁、k₂The coupling coefficients between the transmitting end compensation coil and the transmitting coil and between the receiving end compensation coil and the receiving coil are respectively substituted into the formula (6), and the following can be obtained:

according to the equations (3) and (8), the limiting conditions for keeping the output power constant while keeping the input voltage constant and the load constant are as follows:

namely, the self-inductance of the transmitting end compensation coil and the self-inductance of the receiving end compensation coil satisfy the relationship:

therefore, based on the formula (10), the transmitting end compensation coil and the receiving end compensation coil are designed to be wound on one or more ferrite strips, and the current flow directions of the transmitting coil and the transmitting end compensation coil are consistent (clockwise or anticlockwise). The connection mode between the blocking capacitor and the resonant capacitor of the transmitting coil and the transmitting end, the transmission end compensation coil and the blocking capacitor and the resonant capacitor and the receiving end compensation coil of the receiving coil and the receiving end is consistent with that of the traditional LCC topology. The output power of the electric vehicle wireless charging system adopting the inductance integrated LCC compensation topological structure can be kept the same as the power of the electric vehicle wireless charging system adopting the traditional LCC compensation topological structure, the integration of the additional resonant inductance and the main coil is realized, the space for placing the additional resonant inductance is saved, and the circuit characteristics of the traditional LCC structure are kept.