调频恒能量脉冲功率合成电路的研究与设计

发布时间：2018-06-30 20:41

  本文选题：恒能量脉冲 + 调频　； 参考：《昆明理工大学》2015年硕士论文

【摘要】：当今的电力电子技木,主要通过PWM (Pulse Width Modulation)即脉冲宽度调制方式来完成功率主电路的变流,而存在以下几个不足：①功率开关器件在开通关断过程中由于电压和电流的不同步而导致主开关器件要承受瞬时功率很高的开关损耗,且随着变流功率的增大和斩波频率的提高,这种损耗也随之增加,从而使得PWM方式的最高斩波频率受到限制；②PWM变流主电路的能量传输方式为电压传输特性,因此,需要在变流主回路中设置过流速断保护来解决输出过负载和输出短路的问题,由于过流速断保护电路在关断的瞬间,电路中的di/dt的值很大,该di/dt值与导线的分布电感相互作用而在电路中产生极高的尖峰电压,该尖峰电压与电源电压正向串联后极易将功率开关器件击穿；③若输出要求为恒功率特性(即不管负载的阻值如何变化而输出功率不变),则现有的技术只能通过电压和电流的双闭环负反馈控制来实现,这种的双闭环负反馈控制方法过于繁琐,增加了控制电路实施的困难。本项目为企业委托开发项目,经查询,国内目前没有满足要求的产品。因此,只能通过自行研发来解决,技术要求高且难度大,而本论文为项目完成过程的部分成果之一。论文的主要创新点在于：①依据电子电路的功率特性传输原理和项目的目标要求,提出了一种单通道调频式恒能量脉冲功率合成变流新方法,使所构建的应用系统在开环条件下即可实现恒功率特性输出,同时又能保证输出不失真条件下有效提高电路斩波频率,减小整个电路的体积；②为克服DSP运行速度的限制,采用模拟方式对功率主回路实施控制；③为克服传统的电压-频率转换电路线性区不够宽的问题,提出了一种全新结构的对称式高速高精度的电压-频率转换电路；④完成了全系统的控制电路和主回路的原理图及PCB板的设计和焊接,调试及波形指标的检测,最终达到了项目的要求。本文对电力电子技术的现状和存在问题作了简单论述,并对论文所涉及的知识进行了简要的介绍,在此基础上,对高速高精度电压-频率转换电路的原理进行了论述,同时对恒能量斩波式功率合成电路的系统原理及电路的设计进行了较为详细的分析。
[Abstract]:Nowadays, power electronics technology, mainly through PWM (Pulse width Modulation), that is, pulse width modulation to complete the main power circuit converter, However, there are the following shortcomings: 1 power switch devices in the turn-off process, because the voltage and current are not synchronized, leading to the main switch device has to bear a very high switching loss of instantaneous power. With the increase of converter power and chopper frequency, the loss increases, so the maximum chopping frequency of PWM mode is limited. The energy transmission mode of PWM converter is voltage transmission characteristic. In order to solve the problem of output overload and output short circuit, it is necessary to install overvelocity protection in the converter main circuit. Because the value of di/dt in the circuit is very large when the circuit is turned off, The di/dt value interacts with the distributed inductance of the conductor to produce a very high peak voltage in the circuit. The peak voltage in series with the supply voltage is easy to break down the power switch device. (3) if the output is required to be constant power (that is, no matter how the resistance of the load changes and the output power is constant), the existing technology can only be realized by double closed loop negative feedback control of voltage and current. This double closed loop negative feedback control method is too complicated and makes it difficult to implement the control circuit. This project is commissioned by the enterprise development project, after inquiry, domestic products have not met the requirements. Therefore, it can only be solved by R & D, the technical requirements are high and difficult, and this paper is one of the achievements of the project completion process. The main innovation of this paper is that according to the transmission principle of the power characteristic of the electronic circuit and the target requirement of the project, a new method of single channel frequency modulation constant energy pulse power synthesis converter is proposed. In order to overcome the limitation of DSP speed, the constructed application system can realize the constant power characteristic output under open loop condition, at the same time, it can effectively increase the chopping frequency of the circuit under the condition that the output is not distorted, and reduce the volume of the whole circuit. In order to overcome the problem that the linear range of the traditional voltage-frequency conversion circuit is not wide enough, a novel symmetrical high speed and high precision voltage-frequency conversion circuit is proposed in this paper. (4) the schematic diagram of the control circuit and the main circuit of the whole system, the design and welding of PCB board, the debugging and the testing of the waveform index are completed. Finally, the requirements of the project are met. In this paper, the current situation and existing problems of power electronics technology are briefly discussed, and the knowledge involved in this paper is briefly introduced. On the basis of this, the principle of high speed and high precision voltage-frequency conversion circuit is discussed. At the same time, the system principle and circuit design of constant energy chopped power combiner are analyzed in detail.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN73

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中国期刊全文数据库 前1条

1 徐德鸿;21世纪电力电子技术的机遇与挑战[J];电工技术杂志;2002年10期

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