【作者】 宋坚锋；

【导师】 贲洪奇；

【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2011， 硕士

【摘要】 近几年,随着各国“稀土价格战”的不断升级,国内有关部门及稀土行业对稀土的开采和电解越发重视,作为电解稀土用的电解电源又一次被提上议程。IGBT具有体积小、反应速度快、反向恢复时间短、功耗小等优点。稀土电解电源采用IGBT作为开关管,解决了以往电解稀土用的可控硅整流电源体积大、效率低等缺点。同时,采用IGBT作为开关管,提高了开关电源频率,优化了电源的输出性能。通过对移相全桥软开关(FB-ZVZCS)的拓扑结构以及大、中功率开关电源副边整流回路的研究分析和探讨比较,确定了主电路原边采用串联饱和电感和阻断电容的FB-ZVZCS拓扑结构,主电路副边采用全波整流方式。主电路原边串联饱和电感,缩短了变换器的换流时间,防止了占空比的丢失;串联阻断电容,帮助了原边电流复位,同时还具有防止高频变压器偏磁的作用。建立了稀土电解电源损耗模型,分析了稀土电解电源中IGBT开关管、高频变压器及副边整流二极管等器件的损耗情况,根据此,选择了稀土电解电源中有关主要器件的型号和参数,计算了单个模块在某一个工作点的效率,预测了稀土电解电源的效率。结果表明,此种模型计算预测的效率与实测计算的效率相差不到50W。根据器件损耗的不同,结合主电路的拓扑结构,对稀土电解电源热回路进行了设计。分析了稀土电解电源系统中产生电磁干扰的原因,并对产生电磁干扰的干扰源进行了分析和处理。从磁性器件入手,设计和优化了高频变压器和饱和电感等磁性器件,减小了磁性器件本身对电源的干扰以及磁性器件相互间的干扰。除此之外,对电源系统中的其他干扰源及易受干扰的部位采用屏蔽、吸收等方法进行处理,从而提高了电源系统的稳定性及电磁兼容性能。研制了一台输入电压380V,输出电压0～15V可调,输出电流0～15000A的稀土电解电源样机,采集和分析了超前臂和滞后臂的电压电流波形,验证了超前臂的零电压(ZVS)开通以及滞后臂的零电流(ZCS)关断,实现了稀土电解电源在全工作范围内的软开关;对稀土电解电源的整机效率进行了测试和计算,结果表明,此稀土电解电源效率可达81%以上。更多还原

【Abstract】 Recently, with the prices of RE(rare earth) accelerating, domestic relating departments and RE industry have put more emphasis on the extraction and electrolysis of the rare earth. Power source that is used to electrolyze has been put on the agenda.Since IGBT has the advantages of small volume, rapid response, short reverse time and low power dissipation, rare earth power employ the IGBT as its power switches, which solves the disadvantage of the large volume and high power dissipation of the silicon control rectifier of the traditional power. Moreover, with the higher switching frequency, this power optimizes the performance of the output.Through analysis and comparison of the Phase Shift- Full Bridge- Zero Voltage Zero Current Switching (PS-FB-ZVZCS) topology and the secondary rectifier circuit of high power source, this paper employ the PS-FB-ZVZCS topology. The primary inductor of its main circuit is in series with blocking capacitor and saturated inductor. The saturation inductor helps accelerate commuting and prevent the loss of duty ratio, while the blocking capacitor helps the reset of the primary current and prevent the high-frequency transformer from magnetic saturation.The model of the electrolysis power for rare earth and the analysis of the power dissipation of the IGBT, transform, diodes used to rectifier has been proposed in this paper. According to that, the accurate type and parameters of the main devices has been chosen. This paper has predicted the efficiency of this converter through computing the efficiency of one module and the results shows that the error between the computing efficiency and the experiment efficiency is less than 50W. Considering both the topology of the main circuit and different power dissipation of devices, the thermal circuit of the electrolysis power has beendesigned. This paper has analyzed the cause of the electro-magnetic-interference (EMI), and attenuated the EMI sources. Firstly, the saturation inductor of the transform has been optimized, which helps reduce the interference of the system and the magnetic devices. Besides, other EMI sources has been shielded or absorbed, which helps enhance the stability of the electrolysis power.An electrolysis power of 380V input, 0~15V and 0~15000A output has been designed. The waveform of the voltage and current of the leading-leg switches and the lag-leg switches verified that this system has achieved the soft switching in full range. The computing results and the experiments of the electrolysis power verified that its efficiency is larger than 81%.更多还原