谐振式磁耦合无线电能传输系统传输特性及实验仪设计

Transmission characteristics of resonant magnetic coupled wireless power transmission system and design of experiment instrument

利用磁耦合理论,分析了谐振式磁耦合无线电能传输系统的传输特性,开发了一种谐振式双线圈磁耦合无线电能传输实验仪.利用LED负载直观定性地观测了系统的传输特性,实验测量了发射线圈高频等效电阻及系统输出功率与信号频率、传输距离和负载的关系,获到了最大传输功率条件和频率分裂规律.实验表明,线圈在MHz频率下趋肤效应明显,频率越高,等效电阻越大;磁耦合无线电能传输系统的谐振特性不仅与频率相关,还与耦合系数相关;最佳全谐振时输出功率和传输效率最大.本实验仪可拓展测量RLC串联电路稳态特性,工作稳定,实验与理论吻合好.

The transmission characteristics of a magnetic coupled wireless power transfer system are analyzed based on the magnetic coupling theory, and an experiment instrument of the resonant magnetic coupled wireless power transfer system is developed. The transmission characteristics of the system are visually observed under the LED load. The high frequency equivalent resistance of the transmitting coil is measured. The condition of maximum output power and the law of frequency splitting are obtained by exploring the relations between the output power and the signal frequency, transmission distance, or load of the system. The results indicate that the trend-skin effect of the high frequency coil is obvious;and the higher the frequency is, the greater the equivalent resistance. The resonant characteristics of the magnetic coupled wireless power transfer system are not only related to the transmission signal frequency and the inherent frequency of the receiver and transmit circuit, but also linked to their coupling coefficient;the output power as well as the transmission efficiency is maximized at the optimal full resonance. Our design experiment instrument can be generalized to measure the stable characteristics of RLC series circuits, and operate stably. The experimental results are consistent with the theory.