【作者】 郝欣；

【导师】 杜少武；

【作者基本信息】 合肥工业大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 随着世界经济的发展和科学技术的进步，对高压、大功率开关电源的需求越来越高。尤其在众多的大型科学试验装置中，对其供电电源均有特殊的要求，如高电压，大电流，大功率，低纹波，低储能等等。脉冲阶梯调制技术(PSM)是将阶梯调制(SM)技术和脉宽调制(PWM)技术相结合的一种技术，是高电压大功率电源系统中一种重要的调制技术。传统的脉冲阶梯调制技术的高压开关电源由若干个结构相同的电源模块组成。在工作过程中一个模块处于PWM状态，其余模块工作在开关状态。这种方式控制简单，但由于固定一个模块工作在PWM方式下，使得该模块开关损耗大，每个模块的发热不均匀，从而给电源模块的设计带来问题，若每个模块都按PWM模式进行热设计，势必造成浪费；若按开关全开通模式进行热设计，则工作在PWM模式下的电源模块过热，严重时会损坏电源模块；若对两种模块分别进行热设计，则电源模块的规格不统一，模块备份不方便。为了解决上述问题，本文提出了一种新型的控制策略，采用m个电源模块循环工作在PWM模式下，使整个电源的发热平摊在每个模块上。因此，每个电源模块的规格可设计成一样，解决了电源模块的冗余问题，对提高电源系统的可靠性具有重要的意义。文中基于MATLAB/SIMULINK的仿真环境，对系统的控制方法进行了仿真研究。文章最后，采用六组开关模块单元串联，通过实验验证了控制策略的可行性和优越性。更多还原

【Abstract】 Recently, with the development of semiconductor technology and power electronics technology, the need for high-voltage and high-power supply become more, especially in some scientific experiments. These experiments usually have some special demands such as high-voltage, high-power etc.The pulse step modulation (PSM) technology is the combination of the pulse width modulation(PWM) and the step modulation(SM).and it is an important technology which is used in high-voltage, high-power switching power supply system.Conditional power supply system based on PSM technology is made up of several power units and one of these units works at PWM while others works an on-off state. This strategy is easy to work but the unit working at PWM state has more switching loss and brings difficulty to the design of system. If we design every unit at PWM state, it is a great waste and if we design the units in two ways, it has difficulty in unification of standards.To solve the problems, we use a new control strategy. In this strategy the units work at PWM state in cycle. So the heat distributes to every unit. We can design every unit at the same size. MATLAB is also used to improve the control strategy. At last, the advantage of this new strategy is verified on an experimental prototype.更多还原