基于改进型ZVT Buck电路的IPT充电系统设计

Design of IPT charging system based on improved ZVT Buck circuit

为了避免在感应式无线电能传输系统的耦合机构中增加多余的开关器件以及额外的无源元件,同时减小系统工作在高频率、大功率时全控型开关器件存在的开关损耗,提出基于改进型ZVT Buck电路闭环控制的方法实现对电池的恒流、恒压充电,通过分析改进型ZVT Buck电路的工作模态以及对电路参数的设计,确保在整个充电过程中DC-DC变换器均工作在软开关状态,最后搭建充电电流为35 A、充电电压为370 V的实验平台验证该方法的可行性。结果表明:该方法控制简单,并且降低了系统电路结构的复杂度,传输效率相对较高,能够满足恒流恒压充电需求。

In order to avoid adding redundant switching devices and additional passive components in the coupling mechanism of the inductive wireless power transmission system,and to reduce the switching loss of the fullycontrolled switching devices when the system operates at high frequency and high power,proposes a closed-loop control method based on the improved ZVT Buck circuit is proposed to achieve the constant current and constant voltage charging of the battery.By analyzing the working mode of the improved ZVT Buck circuit and designing the circuit parameters,it is ensured that the DC-DC converter works in a soft switching state during the whole charging process.Finally,an experimental platform with a charging current of 35 A and a charging voltage of 370 V was built to verify the feasibility of the method,this method is simple in control and reducing the complexity of the system circuit structure,and the transmission efficiency is relatively high.The method can meet the requirements of constant current and constant voltage charging.