Influence of primary side detuning parameters on three-coil magnetic resonance wireless power transmission system
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摘要: 三线圈磁谐振无线电能传输(MR-WPT)系统因存在交叉耦合,使得一次侧处于失谐状态,导致系统的传输功率有所下降。而现有研究MR-WPT系统失谐参数与传输功率关系的方法存在所考虑的失谐参数变量较多、参数之间的关系复杂、控制算法计算量大等问题。针对上述问题,以三线圈串联型磁谐振式失谐拓扑结构为研究对象,提出了一种三线圈串联型MR-WPT系统一次侧失谐参数设计方法,通过引入虚拟耦合因数简化参数计算过程,无需复杂的算法和设计额外的硬件电路。研究了一次侧失谐参数对三线圈MR-WPT系统的影响,分析了MR-WPT系统3个线圈回路之间的不同虚拟耦合因数、失谐因子与系统传输功率的关系:① 发射线圈与中继线圈回路内阻比的大小可表征系统是否存在频率分裂现象。② 发射线圈与中继线圈、中继线圈与接收线圈的虚拟耦合因数取值相等时,系统对应的输出功率要大于取值不相等时的输出功率,发射线圈与接收线圈的虚拟耦合因数等于1时系统的输出功率最大。③ 失谐因子可衡量一次侧的失谐程度,其取值越大,一次侧失谐程度越大,其取值越小,一次侧失谐程度越小。④ 当失谐因子为定值时,品质因数越大,工作频率与谐振频率差值越小,此时失谐程度越小;当失谐因子为定值时,品质因数越小,工作频率与谐振频率差值越大,此时失谐程度越大,在设计一次侧失谐参数时,宜适当选取较大的品质因数,以降低失谐频率的波动。实验结果验证了参数设计与分析结果的正确性。
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关键词:
- 三线圈磁谐振无线电能传输系统 /
- 传输功率 /
- 一次侧失谐 /
- 虚拟耦合因数 /
- 失谐因子
Abstract: Three-coil magnetic resonance wireless power transmission (MR-WPT) system with cross-coupling is in a detuned state on the primary side, resulting in a decrease in the transmission power of the system. However, the existing methods for studying the relationship between detuning parameters and transmitted power of MR-WPT systems have problems such as a large number of detuning parameter variables, complex relationships between parameters and large control algorithm calculations. To address the above problems, a three-coil series-connected MR-WPT system primary-side detuning parameter design method is proposed with a three-coil series-connected magnetic resonance detuning topology. This method simplifies the parameter calculation process by introducing a virtual coupling factor without complicated algorithms and designing additional hardware circuits. The influence of the primary-side detuning parameters on three-coil MR-WPT system is studied, and the relationships between different virtual coupling factors, detuning factors and system transmitted power in the three coil loops of the MR-WPT system are analyzed. ① The internal resistance ratio between transmitting coil and relay coil loops can illustrate whether there is frequency splitting in the system. ② When the virtual coupling factor value of transmitting coil and relay coil equals with the value of relay coil and receiving coil, the corresponding output power of the system is greater than the output power with unequaled values. The output power of the system is maximum when the virtual coupling factor value of transmitting coil and receiving coil is 1. ③ The detuning factor can measure the detuning degree of the primary side. The larger value means the greater detuning degree of the primary side and the smaller value means the smaller detuning degree of the primary side. ④ When the detuning factor value is fixed, the larger the quality factor is, the smaller is the difference between working frequency and resonance frequency as well as the detuning degree. When the detuning factor is fixed, the smaller the quality factor is, the larger is the difference between working frequency and resonance frequency as well as the detuning degree. When designing the detuning parameters of the primary side, it is suggested to choose larger quality factors to reduce the fluctuation of detuning frequency. The experimental results verify the correctness of the parameter design and analysis results.
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