期刊论文

中文

南华大学学报(自然科学版)

1673-0062

2017

31

2

30-35

10.19431/j.cnki.1673-0062.2017.02.006

国家核能开发科研项目(H6600003)；

本校为第一机构

2.45 GHz微波磁控管在工业与家用中被广泛使用.用半桥L LC谐振变换器作 为主电路,以 STM8嵌入式系统为核心设计了电源的数字化控制系统,并通过改变主 电路开关管的开关频率与占空比实现有源功率因数校正（ APFC）以及输出功率调节. 电源的输出为恒功率控制,同时加入了对过温、过压、过流的诊断与调节控制算法.实 验结果表明,该电源可安全可靠的工作在软开关状态;并以额定功率为1.2 k W 的不 同型号磁控管验证了电源的负载自适应能力;输出功率可在500 W -1 200 W 之间变 化,步进值为20 W ;在额定工作状态下输入功率因数可达到0.98,电源的效率高于 95%,该电源成本较低,且可实现多单元总线控制.

2.45 GHz microwave magnetron is widely used in industry.A half-bridge LLC resonant converter is used as the main circuit of the power supply system,which is designed by using STM8 single-chip microcomputer.In order to enhance the power factor and reduce the input current ripple,both switch frequency and duty ratio of the MOSFET are changed.Output is regulated by constant power controller.It includes over temperature,over voltage,and over current protection.The power supply can be operated in soft switch state and it has good adaptability to different kinds of 1.2 kW magnetrons.The output power...