无通讯模块无线充电系统的控制策略研究

基于副边控制无线充电系统,提出了原副边无通信模块的无线充电系统的控制策略。首先,对串联谐振无线充电系统工作稳定性进行分析,得到为保证稳定工作副边需控制输出电压,文中采用半控整流电路通过调整占空比控制输出电压。进一步分析得出系统在负载降低与副边升高输出电压两种情况下,由于无法达到预期的输出电压值,导致负载无法正常工作。通过在原边引入对负载与副边半控整流电路开关占空比估计的方法,实现在原副边无通讯模块下,原边针对变化情况同步调整输入电压,使系统能够满足输出条件。最后,在MATLAB中对控制策略进行仿真验证。

Research on control strategy of wireless charging system without communication module

Based on the wireless charging system controlled by the secondary side, a control strategy for the stable operation of the wireless charging system without the communication module between primary side and secondary side was proposed. First, the work stability of the series resonance wireless charging system is analyzed, and in order to ensure stable operation, the secondary side needs to control the output voltage, control output voltage by adjusting the cycle of duty of semi-controlled rectifier circuit . Further analysis shows that the system may not work properly under the two conditions of reduced load and increased secondary output voltage. By introducing the method of estimating the load and the duty cycle of the secondary switch on the primary side, the primary side can synchronously adjust the input voltage without the communication module, and the system can work stably. Finally, the simulation of the control strategy is verified in MATLAB.