两负载式谐振耦合无线电能传输系统

在无线电能传输系统应用中,接收装置之间互相靠近时交叉耦合的存在,使发射端的能量不能有效的传送给多个接收端.针对无线电能传输系统中多负载装置这一研究热点,建立了含有两个接收端的谐振耦合式无线电能传输系统模型.首先从等效电路的角度进行展开,提出在交叉耦合的情况下运用最大平均功率传输定理,使系统满足阻抗匹配;然后从耦合系数的角度研究接收端的负载功率,对不同负载功率的公式进行了推导和数值计算,并通过实验仿真验证了理论分析的正确性.结果表明,系统在最大平均功率传输定理实现阻抗匹配的基础上,通过调节发送端和接收端的耦合系数,不需要改变接收装置的位置,就能够减少发送端的反射系数,从而使负载端有效的接收发送端发送的能量.

Wireless Power Transmission System of Two Loads Based on Magnetic Resonant Coupling

For wireless power transmission system,the transmitting device can not effectively transmit energy to the receivers because of the coupling between the receiving devices.With wireless power transmission system in multi-loads being a hot research,a model of magnetically coupled wireless power transmission system with two receivers is established.From the perspective of the equivalent circuit,maximum average power transfer theorem of the system is proposed to meet the impedance matching with the presence of cross-coupling.Then two load powers at the receivers are to be studied combining with the coupling coefficients.The power formulas of different loads are derived and the correctness of the theoretical analysis is verified through the experiment of simulation.The results show that,without changing the position of the receivers,the system,based on the theorem of transferring maximum average power,can reduce the reflection coefficient of transmitter by adjusting the coupling coefficients of transmitter and receivers,thus it can transmit the energy to receivers effectively.