The multi - level inverter is a circuit topology proposed in the early 1980s particularly applied in the high voltage variable frequency speed regulation area . it has the characters of reducing the switch stress and improving the quality of output waveform 多电平逆变器是上世纪80年代初提出来的一种适用于高压变频调速领域的电路拓扑,具有降低器件应力,改善输出波形质量的特点。
A novel three - level ac chopper is proposed , which is a new multi - level converter applied to high voltage conversion , and utilizes more electric levels to form output voltage and decrease the harmonic content of output waveform 摘要提出一种用于高压电能变换的新型三电平交流斩波电路,该电路允许使用低电压等级的器件完成高压电能变换,并采用较多的电平数去逼近所希望的波形,使输出电压或电流的质量大大提高,谐波含量减少。
The test results demonstrate that this prototype has excellent comprehensive performances such as small bulk , lower weight , high efficiency , high steady precision , fast dynamic response , wide range input voltage , good output waveforms , strong over - load and short - circuit ability , and strong function with different nature load and three - phase unbalanced load 试验结果表明,该变流器具有体积重量小、变换效率高、静态精度高、动态响应快、输入电压变化范围宽、输出波形质量高、过载与短路能力强、带不同性质负载和带三相不平衡负载的能力强等优良的综合性能。
In the digital inverter , we adopt the technology of digital dynamic waveform correction , which can compensate the delay between control signal and output waveform , and ensure the accuracy of control . at the same time , the technology of digital dc component adjustment was introduced , by which we can exactly compensate the control signal , and realize adjusting dc component of output on the premise of output performance 在基于dsp的数字变换器平台中,采用全数字波形校正技术,完全补偿了控制信号延时、功率管开关延时以及死区时间对输出spwm波形所产生的畸变,充分保障了变换器控制的准确性;采用数字直流分量调节技术,可以精确地对控制信号进行补偿,在充分保证输出性能的前提下,实现了输出直流分量的调节。
Coc can make the ripple of output waveforms smallest , using current prediction control for a tool , which is based on dm , but better than dm . after discussion of principles a control strategies , rdcli and active clamp resonant dc link inverter ( acrli ) are discussed deeply in paper by using the 在论述谐振直流环节逆变器的工作原理和控制策略之后,本文对rdcli和acrli拓扑,采用ansoft公司的simplorer仿真软件进行了详细的仿真分析,仿真结果验证了原理和控制策略的正确性,并讨论了这两种拓扑实现的关键点及难点,并提出了进一步的构想。
The difficulty of common processing platform lies in in stage two : the design of ip core - - pci - local bus bridge , . this thesis analyses the structure and operation principle of this bridge at first , then according to the structure of the bridging module , fmishes the design of fpga with four modules which fulfill the bridging function of ip core - pci - local bus , and succeeds in matching at spartanll series device x2s50 - fq256 - 5 , company of xilinx , finally simulates emulation of bridge of pci - local bus in terms of system level , and detaily analyses the output waveform 通用处理平台的设计难点在于阶段二中ip核? ? pci - localbus桥的设计与实现,本文首先分析该桥的组成结构与工作原理,然后参照桥接模块结构分四个模块完成该ip核的fpga设计与实现,并在xilinx公司spartan系列器件上成功匹配。最后从系统级的角度完成对pci - localbus桥的模拟仿真,并对输出波形进行了详细分析。
System takes intel 16 micro - controller as the core controller and adopts advanced ipm module that replaces the silicon as inverter so that the output waveforms have been heavily improved , which compare with the waveforms after chopping of silicon , which not only reduces the loss of the transformer , but also lengthens the light life - span 系统采用先进的智能功率模块( ipm )取代以往的可控硅作为功率变换器件,以intel16位单片机为核心控制器采用ac - dc - ac变换技术使输出的波形较可控硅斩波后的波形有很大的改善,这不仅降低了变压器的损耗而且延长了灯的寿命,提高了系统的运行质量。
So the conceptions of " characteristic variable " and " characteristic model " are presented here , and with them as a clue , the paper focuses on collecting and summarizing the characteristic variable which can indicate system ' s state and performance , physical meaning of the variables are discussed also . the characteristic variable includes : stability - monitoring variable , characteristic variable based on time - domain performances , output waveform variable , parameter variable and circumstance variable 为此,本文提出特征量和特征模型的概念,并以此为思想主线,重点研究了能够表征系统性能的特征量及其意义,引入了系统稳定性监控的特征量、与控制指标相关的特征量、输出波形特征量、参数特征量及环境特征量。
Gpmb is described by circuit diagram during the design phase , but is implemented by the verilog hdl . in the unit test phase , the testbench simulates reading or writing registers by the mcu , then we can analyse the output waveform . in virtue of sumsung ' s flash memory model , the flash controller is tested during the unit test phase . the system test of the gpmb is taken with the demo board Gpmb模块在设计中用电路图描述,在实现过程中用veriloghdl语言描述,在单元测试中采用模拟mcu对寄存器读写后观察波形的方式,并借助flash模型来辅助测试flash控制器,系统测试直接在fpga演示系统上进行,并采用了实际的mcu及flash芯片,与其他模块联合测试。
In order to apply the basic principle of a new em method of exploration to practice and to provide some bases for developing equipment , the following three problems are analyzed and discussed : when the source signal is a sharp electromagnetic pulse , the output waveforms of the second - order band - pass filter of incident wave and reflected waves ; the inversion method by using the waveform of transient superposition of incident waveform - front and reflected waveform - fronts to get electric conductivity and thickness of strata ; and the key problem in the design of sounding equipment 摘要为能够实施电磁测深新方法的基本原理,并为研制探测仪器提供一些依据,分析和讨论了源信号为尖脉冲时,入射波与地层反射波通过二阶带通滤波器的输出波形;利用反射波与入射波前沿瞬态叠加的波形,反演地层的电导率和厚度的方法及与探测仪器有关的主要问题等内容。