ac converter造句

• Research on a novel control method of a hf link dc ac converter
  励磁控制下抽水蓄能电机静止变频器起动研究
• Typical application of electric propulsion system used on ac converter
  交流变频调速电力推进系统的典型应用
• Ac converter circuit
  交流?换回路
• Dc - ac converter
  直流一交流转换器
• The present status and development trend of ac / ac converters are firstly presented in the thesis
  本文首先论述了ac ac变换器的发展及现状。
• The present status , development trend and application field of ac / ac converters are firstly presented in the thesis
  本文首先论述了ac ac变换器的发展现状及应用前景。
• The present status , development trend and application field of ac / ac converters are firstly presented in the thesis
  本文首先论述了ac ac变换技术的发展现状及应用前景。
• Then the direct ac - ac converter was gotten by eliminating the middle direct current link
  整流阶段，采用输入电流空间矢量调制；逆变阶段，采用输出电压空间矢量过调制模式。
• The research of direct ac / ac converters derived from dc - dc topologies by using bi - directional power devices is a hotspot in recent years
  基于dc - dc拓扑、通过双向化功率开关实现直接ac / ac变换,是近年来ac / ac功率变换技术研究的热点。
• Comparing with the ac - dc - ac converter , the commutation process of a matrix converter ( mc ) is more complicated due to having no natural free - wheeling paths
  摘要由于矩阵变换器( mc )电路没有续流路径，它的换流过程比交直交变换器更为复杂。
• Then novel circuit structure and circuit topologies family of current mode ac / ac converters with high frequency ac link , based on flyback converter , are proposed
  本文提出了基于反激flyback变换器的电流源高频交流环节ac ac变换器电路结构及其拓扑族。
• Then novel circuit structure and circuit topologies family of voltage mode ( based on forward converter ) and current mode ( based on flyback converter ) ac - ac mode ac / ac converters with high frequency link , are proposed
  本文提出了基于正激forward变换器的电压源型和基于反激flyback变换器的电流源型交?交型高频环节ac ac变换器电路结构与拓扑族。
• Sam anlagentechnik engineering gmbh - our products and services are covered into the following ranges : low voltage switchgears , rectifiers and electrical supply system as well as transformer stations and / or inverters , dc / ac converters
  Sam anlagentechnik engineering gmbh是一家知名的、诚信的生产商和服务商，该公司提供新型的、专门的产品，例如低压配电装置,整流器,变电站,供电设施,振动子换流器、反用换流器、逆变器。
• The current mode ac / ac variable frequency converters with high frequency ac link are also presented in the thesis the current mode ac / ac converters with high frequency ac link have the advantages such as simple topology , two - stage power conversions , bidirectional power flow , high frequency electrical isolation , strong load adapting ability , suit for low power conversion fields
  论文对这类变换器实现ac ac变频变换作了初步探讨。这类换器具有电路拓扑简洁、两级功率变换( lfac hfac lfac ) 、双向功率流、高频电气隔离、网侧电流波形好、负载适应能力强、适合于小功率变换场合等特点。
• Taking single four - quadrant power switch mode circuit as an example , the operational mode , steady principles , transient voltage feedback control strategy of current mode ac - ac mode ac / ac converters with high frequency link are investigated . the output characteristic curve and the design for the key circuit parameters are given
  以单四象限功率开关式拓扑为例，分析研究了电流源交?交型高频环节ac ac变换器的工作模式、稳态原理与电压瞬时值反馈控制策略，给出了变换器的关键电路参数的设计准则和变换器的外特性曲线。
• On the bases of detailing the control theory and circuit of dc - ac converter , this paper introduces the fuzzy logic theory into the control of the digital pwm converter . in order to realize the control strategy , intel high performance micro controller 80c196kc , the kernel of the intelligent controller are purposed
  本文在讨论逆变器控制理论和控制电路的基础上，将模糊控制理论引入到数字式pwm型逆变器的控制中，设计了以80c196kc为核心的智能控制器，用新型的基于eprom存储的pwm电路给予实现的硬件电路。
• The thesis presents a group of direct ac / ac topologies including single and three phases ac / ac converters which are based on simple dc - dc topologies and realized by using the single - power tube four - quadrant switches . with only two power switches , these single or three phases ac / ac converters can achieve high quality four - quadrant ac / ac conversion by simple configurations and simple control schemes . the thesis mainly researches on the single phase ac / ac converter in the topologies including ac _ buck and ac _ cuk
  本文介绍了基于直流buck 、 boost和cuk电路,采用单有源四象限开关实现功率双向化的直接ac / ac变换拓扑族,该拓扑族中的单、三相变换电路均只使用两个功率开关,可实现波形优良的同频ac / ac四象限变换,具有电路结构简单、控制简便、可实现小型化等优点。
• Abstract : this paper discusses the method of adjustable speed driving with bi - directional power transferring converter for motors used in draining and irrigating pumps , a control strategy is proposed to realize super / hyper synchronous speed running with ac - ac converter , and a design for the driver is given based on 16 bit micro - controller
  文摘:针对农用电力排灌站电机调速改造问题，讨论了双馈调速实施方案，提出了采用交交变频实现超/低同步调速的一种控制方法，给出了以高性能16位单片机为核心的双馈调速控制系统软硬件设计
• The prototype test results indicate : voltage mode and current mode ac - ac mode ac / ac converters with high frequency link have the advantages such as high frequency electrical isolation . simple topology , two - stage power conversions , high power density , bidirectional power flow , good line current waveform , no audio noise , high converting efficiency , and high input power factor etc . this kind of converter lay the key technical foundation on new type regulated sinusoidal ac power supply , electronic transformer , ac regulator , and wave converter etc
  试验表明，这类变换器具有高频电气隔离、电路拓扑简洁、两级功率变换( lfac hfac lfac ) 、功率密度高、双向功率流、无音频噪音、变换效率高、网侧功率因数高等优点。为新一代正弦交流稳压器、电子变压器、交流调压器、同频波形变换器的实现奠定了关键技术基础。
• High - frequency link power converters are receiving increasing attention . when the input frequency of ac - ac converter is quite high , such as 20khz or above , in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage , the switching cycle becomes discrete pulse spectrums , however , the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
  当交-交变频器的输入频率非常高，通常为20khz时，为了在零电压条件下实现逆变器开关管的通断，变换器的开关时刻必须选择在高频交流电压脉冲为零时，这意味着变换器开关时刻在时间轴上成为不连续的点，而常规的硬开关pwm变换器是将开关时刻选择在任意时刻。