【作者】 刘胜魁；

【导师】 张春喜；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2006， 硕士

【摘要】 传统的高压直流电源通常是用220V工频交流电经变压器升压、整流滤波而获得的,使得电源的体积和重量很大,并且纹波较大,稳定性不高,效率低。本文将软开关技术应用于高压电源中,做成高频高压电源,大大减少电源的体积和重量,提高了电源的稳定性和效率。在实现高频化的主要逆变电路中,通过研究开关电源的PWM技术和软开关技术,以ZVS PWM DC/DC变换器作为电源的主变换电路,利用高频变压器漏感来实现软开关,详细分析了这类电路的工作原理和实现ZVS的策略,给出了具体设计参数和仿真、实验波形。高频功率脉冲变压器其主要作用为磁藕合传递能量、电气隔离、电压变换和阻抗变换等,其性能的好坏不仅直接影响到输出是否产生波形的畸变及能量传输的效率,而且可能影响到功率开关器件的安全工作。本文分析了影响高频变压器性能的因素:磁芯材料选用的原则,磁芯形状选用的原则,磁芯的种类和特点及变压器的详细设计计算。整个电源系统以DSP为控制核心,用TI公司的TMS320LF2407 DSP芯片来集中实现移相全桥逆变技术、电源输出调压和过压过流保护等功能。控制算法通过软件编程实现使得系统升级方便,也便于用户根据各自的需要灵活地选择不同的控制功能。本电源功率3kW,开关频率为20kHz,高压直流电源输出电压2.4kV,定点可调,纹波系数不大于0.5%,整个电源效率在80%以上。更多还原

【Abstract】 The traditional high-voltage DC power-supply, which usually be gotten by boosting 220V 50Hz AC voltage with transformer and then converting voltage with rectifier filter, has big bulk and weight, high ripple coefficient of output voltage, low stabilization and efficiency. The design of a high-frequency high-voltage power-supply using soft switching power-supply technology is discussed in this paper. The core part includes full-bridge inverter, transformer and rectifier. Primary inverter is a full-bridge inverter constructed by ZVS PWM DC/DC, which insures the system working at high frequency.The main use of transformer for high frequency is to transform energy ,electric insulating, voltage changing and impedance changing as magnetic coupling. The capability of the transformer affect the safety of the device of the power switching. In the paper, the factors that affect the capability of the transformer is analyzed, which including that the principle of the magnetic material selecting, the principle of the shape of the magnetic core, the kinds of the magnetic core and the calculation of the design for the transformer.DSP is the core of the power supply ,The paper adopted TMS320LF2407 made by TI company to realize phase shift full-bridge soft switch, it is also used to adjust the voltage of output and protect the system when current is overflow .The control method is decided by software, it can be modified according to the need of the custom.The power of the power-supply is 3000W.The switching frequency is 20kHz. Output DC voltage of power-supply is 2.4kV and can be changed by DSP. The ripple coefficient is no more than 0.5%. The efficiency of the power-supply system is more than 80%.更多还原