In order to meet the requirements of biological medicine,a two-stage topological structure of the digital scanning power supply is designed.The principle of power supply is analyzed and the control method based on fieldprogrammable gate array(FPGA) digital regulator is described.Simplorer simulation results and test results are listed.The results show that two-stage topology can improve the performance of the scanning power supply working at low currents.The power system has high enough precision and small enough current ripple over its full operating range.%为了满足生物医学方面的实验要求,设计了一款前级Buck电路加后级H桥的两级拓扑结构数字扫描电源.分析了电源工作原理,介绍了基于现场可编程门阵列(FPGA)数字调节器的控制方法,给出了Simplorer仿真结果和电源测试结果.最终测试结果可证明,两级式拓扑可改善扫描电源在小电流运行时的性能,电源系统在整个工作范围内均有较高的输出精度和很小的电流纹波.
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