一种用于SS谐振无线电能传输系统变频移相控制下实现恒压和ZVS的参数设计方法

Parameter Design Method for SS Resonant Wireless Power Transfer System to Achieve Constant Voltage Output and ZVS under Variable-frequency and Phase-shift Control

无线电能传输是一种方便灵活的电能传输方式。以串联-串联SS(series-series)谐振无线电能传输系统为研究对象,通过变频移相控制实现了后级的恒压输出与前级逆变器的零电压开通。首先基于无线电能传输系统的交流等效电路对系统特性进行分析,提出一种在采用变频移相控制下能够同时实现恒压与零电压开通的频率区间存在性判断方法。基于此判断方法,根据相角裕量与系统安全要求对谐振网络参数进行限定,保证了系统在当前设计参数下能够在相应工作指标下正常运行。最后搭建了一套250 W无线电能传输装置,对系统分析的正确性与参数设计的合理性进行验证。

Wireless power transfer(WPT)is a convenient and flexible method for electrical energy transfer.In this pa-per,a series-series(SS)resonant WPT system is taken as the research object,and it is found that the constant voltage(CV)output on the secondary side and zero voltage switching(ZVS)in the primary inverter can be both achieved by using the variable-frequency and phase-shift(VFPS)control.First,the characteristics of the WPT system are analyzed based on the AC equivalent circuit,and a judgement method is proposed to confirm the existence of frequency range for simultaneously realizing CV output and ZVS by using the VFPS control.Second,based on this judgement method,a resonant parameter design method is put forward according to the phase margin and the demand of system safety to ensure that the system can operate normally under the corresponding operation indexes.Finally,a 250 W WPT porotype was built to verify the validity of the system analysis and the rationality of the parameter design method.