基于SiC器件的单管无线电能传输电路研究

Research on Single-switch Wireless Power Transfer circuit Based on SiC Device

传统无线电能传输电路多采用全桥或半桥逆变拓扑,该拓扑电路及控制方式相对复杂、可靠性较低;单管LC谐振逆变电路具有结构简单、无直通问题、可靠性高、可实现零电压开通(zero voltage switching,ZVS)等优点。但是由于LC谐振的影响,该拓扑开关管耐压较高,普通Si器件无法满足需求。为此,该文研究一种基于碳化硅(silicon carbide,Si C)器件的单管LC谐振逆变无线电能传输系统。采用互感等效的方式,给出参数详细设计方法;搭建基于Si C器件的单管无线电能传输平台,通过实验比较电路采用Si C器件和采用Si器件在驱动特性、输出特性、负载特性和效率特性上的不同,验证将Si C器件应用于单管逆变无线电能传输电路的可行性。

The traditional wireless power transfer circuit uses the full-bridge or half-bridge inverter,which has complex circuit and control and low reliability.Single-switch LC resonant circuit has the advantages of simple structure,no shoot-through problem,high reliability and ZVS.However,due to the influence of LC resonance,the blocking voltage of the switch is high,so that the Si device cannot meet the demand.For this reason,a single-switch LC resonant inverter wireless power transfer system based on SiC device was studied.By means of mutual inductance equivalence,the detailed design method of parameters was given.A single-switch WPT platform based on SiC device was built,and the difference of driving characteristics,output characteristics,load characteristics and efficiency characteristics between SiC device and Si device was compared,which verifies the feasibility of applying SiC device to single-switch inverter WPT circuit.