100 kV/25 mA低纹波高压直流电源研制

Development of 100 kV/25 mA high voltage DC power supply with lower ripple

摘要: 百千伏高压直流电源广泛应用于电子束产生与应用领域。高压直流电源电压纹波是影响束流品质的重要因素之一。某型等效阻抗为4 MΩ的电子枪对加载电压提出峰峰值高压纹波不超过0.06%，同时实现较小高压储能以减小打火时电子枪损伤风险，基于全桥逆变和双极性Cockcroft-Walton倍压电路设计了一种不对称电容布局的高压直流电源，在分析储能与纹波、倍压效率关系基础上给出了倍压电路参数简化设计方法，实验结果表明，不额外采用滤波网络，在25 kHz逆变频率、100 kV/25 mA输出条件下纹波系数优于0.06%，相比于传统设计方法，所需高压储能可降低12%以上。

Abstract: High voltage DC power supply is widely used in research and application areas of electron beam. Recently the method of decreasing ripple is a research hotspot due to the ripple of high voltage is the very key factor to quality of beams. This paper studies a novel circuit topology, which is comprised of a high bridge converter and a double polarity Cockcroft-Walton circuit with unsymmetrical capacitors. The experimental results show that the ripple is lower than 0.06% when the output voltage and current are 100 kV and 25 mA, respectively. Meanwhile the storage energy of high voltage units is only 0.85 of traditional circuit.