用于电源测试的馈能式交流电子负载的研究

Research on energy feedback AC electronic load for power supply test

针对用于电源测试的交流电子负载进行研究,提出了一种改进型SVPWM的算法,设计了给定阻抗指令的电流单闭环控制系统并给出了阻抗指令转换为电流指令的计算方法。采用Simulink建模及FPGA代码转换的控制程序实现方案,利用FPGA实现对控制算法的高速运算。通过Simulink仿真验证了模型工作的正确性。搭建了交流电子负载主电路的硬件实验平台。基于单片FPGA实现了交流电子负载的全部控制电路,大大缩短了控制系统的设计周期。实现了用于电源测试的馈能式交流电子负载,为电源的出厂测试提供了既节能又精确的负载实现方案。

The AC electronic load used for power supply test is studied.An improved SVPWM algorithm is proposed.The current single closed loop control system with given impedance command is designed,and the calculation method of converting impedance command into current command is given.The control program implementation scheme of Simulink modeling and FPGA code conversion is adopted,and the high-speed operation of control algorithm is realized by FPGA.The correctness of the model is verified by Simulink simulation.The hardware platform of the main circuit of AC electronic load is built.All control circuits of AC electronic load are realized based on single FPGA,which greatly shortens the design period of the control system.The energy feedback AC electronic load for power supply test is realized,which provides an energy-saving and accurate load implementation scheme for the power supply factory test.