基于脉冲调制技术的LHCD大功率阴极高压电源

为满足HL-2A装置低杂波电流驱动等辅助加热系统的需要,分析设计了基于脉冲调制技术的大功率高压电源,为速调管提供阴极高压。高压电源采用了模块化串联的系统结构,通过控制算法的调节,电源输出连续可调,使低压低频直流脉冲电源转化为高压高频直流脉冲电源,还具有高功率、高稳定、高冗余的特点。重点对模块的器件参数、选型、工艺等进行详细设计分析,利用多绕组变压器的漏感作为模块的滤波电感，选用特性更好的金属薄膜电容、绝缘栅双极晶体管等器件,优化模块结构；设计了29个副边绕组的多绕组高压隔离变压器,设计了电源控制系统,得出适合本电源控制的控制算法,易于调整高压的幅值以及高压的上升下降时间。最后给出大量实验结果,验证电源的保护能力,两种主要的电源控制算法的可操作性及实用性。试验证明,此套电源不仅满足负载提出的快速保护的要求,其电源工作的稳定度等其他参数也满足设计要求。

LHCD cathode high voltage power supply based on pulse step modulator

In order to satisfy the requirement of the lower hybrid current driven(LHCD) system on HL-2A, the high voltage power supply based on pulse step modulator is designed and analyzed. Many modules are connected in series, and the output voltage can be adjusted continuously. The power supply with low voltage and low frequency can be transferred into the power supply with high voltage and high frequency. The power and stability and redundancy are increased. The parameter and type of the components in the module including their technology layout are analyzed carefully. The leakage inductance of the multi-winding transformer is used as the filter inductor. The metallized film capacitors and the IGBT are adopted. The high voltage transformers with 29 second-windings are designed. The control algorithm and control system are designed to satisfy the requirement of the load. Test results especially the over-current protective test results are shown. The practicabilities of the two main control algorithms are tested. Many parameters especially those for quick protection and stability of the power supply can satisfy the requirement of the load.