串联谐振式高压电容器充电电源研究-电机与电器专业论文.docx

摘 要 电容器快速充放电是脉冲功率系统获得脉冲源的主要方式之一，而电容器充电电 源是电容快速充电的关键。串联谐振恒流电容器充电电源具有充电电流恒定，抗负载 短路能力强等优点，非常适合给高压脉冲电容器充电。 本论文介绍了串联谐振式高压电容器充电电源的研制。通过对工作于不连续电流 模式的串联谐振电容器充电电源稳态工作过程的数学分析，得出了谐振电流、谐振电 容电压、等效充电电容充电电压和充电电流、平均充电电流的变化规律及峰值特性， 证明了串联谐振电源具有固有的恒流充电特性，并且还计算出了恒流特性发生变化的 时刻以及该时刻对应的负载电容电压。通过仿真计算，验证了理论分析的正确性。 本论文给出了工作在电流不连续方式下的充电电源主电路参数的详细设计。同时 针对充电电源的应用环境，本论文还设计了以 MC33066 为核心的控制电路，提供了 符合要求的驱动脉冲，并实现了对满充保护信号、驱动过流信号的快速响应；设计了 显示电路，实现了充电电压的实时显示；设计了缓上电电路，实现了上电初期对浪涌 冲击电流的限制；设计了光电隔离传输电路，实现了控制电路地和负载电容地的隔离 以及充电电压测量信号的快速、准确的传输；最后介绍了充电电源输出端的放电反压 保护电路，能够避免负载电容出现反压对充电电源高压整流硅堆造成浪涌冲击，有效 保护电源。 关键词：串联谐振充电电源 恒流充电 高频变压器 MC33066 Abstract The discharging of the high voltage capacitor is used widely in the pulsed power area, and the rapid charging of capacitor is important. High frequency series resonant capacitor charging power supply (CCPS) is introduced in this paper for its constant charge current and the strong immunity of short circuit. This paper presents the research and development work on series resonant high voltage CCPS. By steady state analysis of resonant circuits working in discontinuous current mode (DCM) in series resonant CCPS, three functional relationships between peak value of resonant current, peak value of resonant voltage, voltage on load capacitor and numbers of resonant periods are found and the inherent constant-current characteristic, which disappears as the current through anti-parallel diodes declines to zero, are demonstrated. Furthermore, the precise time when the constant-current characteristic changes and the voltage on the load capacitor at that moment are calculated. The truth of theoretical analysis is testified by circuit simulation. The design steps of the CCPS, which is working in DCM, are given in details in this paper. Except the control circuit based on MC33066, which is used to guard the CCPS, display circuit, soft-start circuit, a fiber isolation circuit, over- voltage, the voltage reversal protection are designed in this paper to boost the stability of the hig