输入串联输出等效并联多逆变器驱动的高压大功率无线电能传输系统研究

提升逆变器输入侧直流电压源的电压等级,是实现更大功率无线电能传输的可行方案之一。但单个开关器件的额定电压有限,满足不了更高输入电压的需求。为此,文章设计了一种输入串联输出等效并联多逆变器驱动的高压大功率无线电能传输系统。该系统采用多个逆变器串联以承担较高的输入直流电压,同时每个逆变器驱动一个独立的发送线圈向同一个接收线圈发送功率。文章在考虑多个发送线圈之间互感的情况下对该系统的谐振电路参数进行了设计,分析在零相差(Zero Phase Angle,ZPA)及非零相差两个条件下系统的电流和功率输出能力,发现了运行角频率及互感的乘积对系统输出能力具有重要影响。开发出由三个逆变器串联驱动的无线电能传输样机,在750 V直流输入条件下获得最大38. 4 kW的无线电能传输功率,效率达88. 7%。

Research on High Voltage and High Power Inductive Power Transfer System Driven by Input-Series Output-Equivalent-Parallel Inverter

One of the possible solutions providing higher power inductive power transfer is to improve the voltage level of the DC source feeding the inverter. The rated voltage of common switches, however, is limited, which couldn"t undertake the high input DC voltage. Hence, a high voltage together with high power inductive power transfer (IPT) system driven by an input-series output-equivalent-parallel topology is proposed in the paper.. For the topology, the high DC voltage is undertaken by multiple inverters connected in series while each inverter drives a independent primary coil to transfer energy to a common secondary coil. Parameters of the system resonant loops are designed with considering the coupling inductances between primary coils. System output characters, including the output current and power are analyzed under zero phase angles (ZPA) as well as none-ZPA. The analysis shows that the product of the operating angular frequency and the coupling inductance between the primary coil and the secondary coil has significant influence on the output current and power. A laboratory prototype driven by three inverters connected in series has been built to verify the theoretical analysis. The maximum experimental transferred power is 38.4 kW with DC-DC efficiency of 88.7% under a 750 V input DC voltage.