一种新型零电压转换高压直流变换器的分析  

Analysis of a Novel Zero-voltage-transform (ZVT) High Voltage DC-DC Converter

作　　者：刘小宝[1] 师宇杰[1] 栾海妍[1] 

机构地区：[1]信息工程大学信息工程学院,郑州450002

出　　处：《高电压技术》2007年第4期175-179,共5页High Voltage Engineering

摘　　要：为克服电流型有源箝位推挽变压器的输入电感过大和变压器升压倍数过大的缺点,满足行波管电源高电压、小电流特别是小体积的要求,提出了一种新型的高压变换器拓扑——有源箝位推挽倍压变换器,它利用变压器及开关管的寄生参数实现开关管的零压开通,同时采用倍压整流技术解决变压器升压倍数高、体积大、制作困难等问题。在详细推导了该变换器的稳态工作原理后,给出了开关管实现软开关的条件等重要结论。用PSPICE软件仿真试验的结果表明,该变换器适用于要求低电压输入、高电压输出、高效率的开关电源。A new choice for the implementation of an isolated de-dc converter operating with a high output voltage and supplied by an unregulated low input voltage are presented in this paper. The proposed topology is especially qualified for the implementation of traveling wave tube amplifiers （ TWTA） utilized in telecommunication satellite applications due to their low mass and volume and high efficiency. The main advantages of the converter are softcommutation in all power switches, constant switching frequency, PWM modulation and integration of the components intrinsic elements （distributed transformer capacitance, leakage inductance and power switches capacitance）. At the same time, the voltage across the main power switches is low by using the active clamping technology. And dual-voltage commutate technology which is used in the output overcomes some disadvantages of traditional high voltage power supply scheme, such as high boost-multiple, big volume and difficulty of execution. The steady-state operating principle of the circuit is analyzed and deduced in detail in the paper, the equal circuits of each switching mode are given, and some main mathematical analysis results are also given, such as the relationship between the clamping voltage and the input voltage and the condition of soft commutation of all power switches. The PSPICE simulation is carried out, and the results verify that the proposed converter is suitable to unregulated low input voltage, high output voltage and high frequency switching power supply with high-efficiency.

关 键 词：有源箝位 推挽 倍压 高压变换器 软开关 行波管放大器 谐振 

分 类 号：TM46[电气工程—电器]