磁耦合谐振式无线电能传输系统谐振方式分析

磁耦合谐振式无线电能传输系统在实际设计中具有传输效率高,结构简单,实用性强等特点。从等效电路的角度研究了单发射-单接收谐振模式中串联-串联式、串联-并联式、并联-串联式和并联-并联式4种谐振模型下系统传输效率。经过数值仿真,得出了每种谐振模型下系统传输效率和输出功率与系统振荡频率、传输距离及带负载能力之间的变化关系,发现每种谐振模型各有其适用工况,总结出了在设计中如何根据实际情况选择适当的谐振方式来达到最佳的传输效果:当所设计的系统供电对象为小负载且仅需较小的传输距离时,采用串联-串联谐振模型能够达到较好的传输效果;当需要具有较远的传输距离和较强的带负载能力时,应采用串联-并联谐振模型;当无法实现较高的系统谐振频率时,应采用并联-并联谐振模型。最后根据4种谐振模型,实际设计制作了4套磁耦合谐振式无线电能传输系统,验证了上述分析的正确性。

Resonant model analysis of wireless power transfer via magnetic resonant coupling

Wireless power transmission system via magnetic resonant coupling in the actual design displays its superiority in its higher efficiency ,simpler structure ,stronger practicability ,etc.Research was conduc-ted on the transmission efficiency of the single launch-receive model in series-series model ,series-parallel model,parallel-series model and parallel-parallel model under four kinds of resonant model system ,from the view of equivalent circuits .By numerical the effects that the operation frequency ,distance between the coils and load resistance may have on the efficiency and the output power was obtained .The results show that each resonator model works well under certain conditions ,and summarizes the way to choose the cor-responding resonant model to achieve the best transmission effect according to the specific situation in the actual design .When the design of the system power supplies for a small load and distance ,using the se-ries-series model better result is achieved ,and when the design needs to have a longer distance for trans-mission and strong load capacity ,it should be used in series-parallel model .