基于LCC的谐振式无线电能传输负载无关性研究

Research on Load Independence of Resonant Wireless Power Transmission Based on LCC

为了给安装在旋转部件上的电子设备进行供电,探究无线供电技术能否对负载进行稳压输出。依据互感模型,建立了耦合线圈发射侧等效电路,计算出系统接收侧和总系统的阻抗表达式,并进一步计算出系统中发射侧和接收侧输出电流的计算公式。通过电流计算公式与各谐振网络之间的关系求出系统的谐振频率以及满足系统输出的各电路参数。仿真结果表明,在特定谐振频率下,当互感恒定时,发射线圈电流仅与系统的输入电压有关,即原边线圈可保持恒定的电流,有利于形成稳定的磁场,有利于电路稳定运行,由此可得输出电压具有负载无关性,易于实现恒压控制。通过仿真与实验,验证了对该电路分析结果的正确性。

In order to supply power to electronic devices mounted on rotating parts,whether the wireless power supply technology can stabilize the load was explored.Based on the mutual inductance model,the equivalent circuit of the transmitting side of the coupling coil was established,the impedance expression of the receiving side of the system and the total system was calculated,and the calculation formula of the output current of the transmitting side and the receiving side in the system was further calculated.Through the relationship between the current calculation formula and the resonant networks,the resonant frequency of the system and the circuit parameters that meet the output of the system were obtained.The simulation results show that at a certain resonance frequency,when the mutual inductance is constant,the current of the transmitter coil is only related to the input voltage of the system,that is,the primary coil can maintain a constant current,which is conducive to the formation of a stable magnetic field and the stable operation of the circuit.The available output voltage is load-independent and easy to realize constant voltage control.Through simulation and experiment,the correctness of the analysis result of the circuit was verified.